CN101932155B - Power supply circuit of light-emitting diode - Google Patents
Power supply circuit of light-emitting diode Download PDFInfo
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- CN101932155B CN101932155B CN2009101394847A CN200910139484A CN101932155B CN 101932155 B CN101932155 B CN 101932155B CN 2009101394847 A CN2009101394847 A CN 2009101394847A CN 200910139484 A CN200910139484 A CN 200910139484A CN 101932155 B CN101932155 B CN 101932155B
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Abstract
The invention discloses a power supply circuit of a light-emitting diode. A first positive output end and a first negative output end of a power source supply device are used for receiving input voltages and outputting drive voltages to a light-emitting diode component. The power supply circuit comprises a second positive output end, a second negative output end, a post-state power source conversion circuit and a control circuit, wherein the second positive output end and the second negative output end are connected with the light-emitting diode component, and the second negative output end is connected with the first negative output end; the post-stage power source conversion circuit is used for converting the input voltages into compensating voltages and is provided with a third positive output end connected with the second positive output end and a third negative output end connected with the first positive output end; and the control circuit is connected with the post-stage power source conversion circuit and the light-emitting diode component and is used for detecting and controlling the current of the light-emitting diode component, wherein the drive voltage is obtained by adding the input voltage and the compensating voltage. The power supply circuit improves efficiency because of a little electric energy conversion loss, and because elements with low voltage-resisting limit can be selected as the elements in the post-stage power source conversion circuit, the cost is reduced.
Description
Technical field
The present invention relates to a kind of power supply circuits, relate in particular to a kind of power supply circuits that reduce the light-emitting diode of power supply conversion losses.
Background technology
In recent years because light-emitting diode (Light Emitting Diode, LED) breakthrough of manufacturing technology, so that the luminosity of light-emitting diode and luminous efficiency significantly promote, thereby so that light-emitting diode replaces gradually known fluorescent tube and becomes new illumination component, be widely used in illuminations such as home lighting device, car headlight device, hand-held lighting device, liquid crystal panel backlight, traffic sign indicator light, indication looking board and use.
And the brightness in order to increase light-emitting diode and to use normally is connected in series a plurality of light-emitting diodes each other and forms a light-emitting diode component.Yet because the relation of light-emitting diode technique, the starting resistor of each light-emitting diode can't be identical, but between for example between 3.2V～3.6V, so the starting resistor of the light-emitting diode component that is formed by a plurality of light-emitting diode serial connections just can be in a scope.For example, when light-emitting diode component is connected in series when forming by 30 light-emitting diode components, the starting resistor of this light-emitting diode component just can be between 96V～108V.
At present, light-emitting diode component all can be connected with power supply circuits, with shinny by the driving of these power supply circuits.Yet because the starting resistor of light-emitting diode component is in a scope, therefore, the starting resistor of the light-emitting diode component that one rear class change-over circuit of power supply circuits inside just can corresponding power supply circuits connects, and with a voltage source, civil power for example, be converted to the required starting resistor of this light-emitting diode component, shinny to drive this light-emitting diode component, power supply circuits are more by adjusting the value of driving voltage simultaneously, and then the current value that will flow through light-emitting diode component is controlled at a fixed value, makes the brightness preservation of light-emitting diode component certain.
Yet as from the foregoing, when the number of the light-emitting diode in the light-emitting diode component is more, the rear class change-over circuit that namely represents traditional power supply circuits needs the electric energy that receives is converted to the more driving voltage of high level, thus, the rear class change-over circuit just can be because need be converted to high level voltage with the electric energy that voltage source provides, and cause power supply circuits to have higher electric energy transition loss and efficient is not good.In addition, because the electric energy that the rear class change-over circuit of power supply circuits needs voltage source is provided is converted to high level voltage, therefore the element in the rear class change-over circuit need be selected the higher element of withstand voltage amount, thus, with so that the cost of power supply circuits also relatively improve.
So, how to develop a kind of power supply circuits that improve above-mentioned known technology defective and can reduce the light-emitting diode of electric energy conversion loss, be in fact the present problem in the urgent need to address of correlative technology field person.
Summary of the invention
Main purpose of the present invention is to provide a kind of power supply circuits of light-emitting diode, need the electric energy that is received is converted to the voltage of high level because of the rear class power-switching circuit to solve traditional power supply circuits, shinny to drive light-emitting diode component, cause traditional power supply circuits to have higher electric energy transition loss and efficient is not good, need select the higher element of withstand voltage amount because of the element in the rear class change-over circuit simultaneously, and then cause the cost of power supply circuits relatively to improve.
For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of power supply circuits are provided, the first positive output end and the first negative output terminal by power supplier receive input voltage, and outputting drive voltage is given at least one light-emitting diode component, power supply circuits comprise: the second positive output end is connected with an end of light-emitting diode component; The second negative output terminal is connected with the other end and first negative output terminal of light-emitting diode component; The rear class power-switching circuit in order to receiving input voltage and to be converted to bucking voltage, and has the 3rd positive output end and the 3rd negative output terminal, and the 3rd positive output end is connected with the second positive output end, and the 3rd negative output terminal is connected with the first positive output end; And
Control circuit is connected with rear class power-switching circuit and light-emitting diode component, in order to detect and to control the size of current of light-emitting diode component, the electric current of light-emitting diode component is kept necessarily; Wherein, power supply circuits are by the second positive output end and the second negative output terminal outputting drive voltage, and driving voltage is formed by input voltage and bucking voltage addition.
For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply circuits are provided, receive input voltage, and outputting drive voltage is given at least one light-emitting diode component, power supply circuits comprise: the prime power-switching circuit, receive input voltage and be converted to transient voltage, and have the first positive output end and the first negative output terminal; The second positive output end is connected with an end of light-emitting diode component; The second negative output terminal is connected with the other end and first negative output terminal of light-emitting diode component; The rear class power-switching circuit, be connected with the prime power-switching circuit, in order to receiving transient voltage and to be converted to bucking voltage, and have the 3rd positive output end and the 3rd negative output terminal, the 3rd positive output end is connected with the second positive output end, and the 3rd negative output terminal is connected with the first positive output end; And control circuit, be connected with rear class power-switching circuit and light-emitting diode component, in order to detect and to control the size of current of light-emitting diode component, the electric current of light-emitting diode component is kept necessarily; Wherein, power supply circuits are by the second positive output end and the second negative output terminal outputting drive voltage, and driving voltage is formed by transient voltage and bucking voltage addition.
Because the power supply circuits of light-emitting diode of the present invention offer the driving voltage major part of light-emitting diode component and are provided by the voltage source that need not change, so that the rear class power-switching circuit that is connected with light-emitting diode component need be that low level voltage has less energy conversion ratios with the voltage transitions that receives only, therefore the rear class power-switching circuit compared to traditional power supply circuits need be high level voltage with the voltage transitions that receives, power supply circuits of the present invention just can because have less electric energy transition loss raising efficiency, also can be selected the lower element of withstand voltage amount because of the element in the rear class power-switching circuit and reduce cost simultaneously.
Description of drawings
Fig. 1: it is the circuit block diagram of the power supply circuits of preferred embodiment of the present invention.
Fig. 2: it is the electrical block diagram of power supply circuits shown in Figure 1.
Fig. 3: it is that one of rear class power-switching circuit shown in Figure 2 changes example.
Fig. 4: it is that one of power supply circuits shown in Figure 1 change example
Fig. 5: it is the circuit block diagram of the power supply circuits of another preferred embodiment of the present invention.
Fig. 6: it is the electrical block diagram of power supply circuits shown in Figure 5.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
1: power supply circuits
10: power supplier
101: the first positive output ends
102: the first negative output terminals
11: light-emitting diode component
12: the second positive output ends
13: the second negative output terminals
14: the rear class power-switching circuit
141: the three positive output ends
142: the three negative output terminals
143,144,514: current rectifying and wave filtering circuit
15: control circuit
151: the first control integration circuit
152: the second control integration circuit
16: flow equalizing circuit
51: the prime power-switching circuit
511: the four positive output ends
512: the four negative output terminals
513: rectifier
V
In: input voltage
V
Com: bucking voltage
V
o: driving voltage
V
In': transient voltage
G: connect altogether end
G
1: light-emitting diode
T
1, T
2: transformer
N
F1, N
F2: armature winding
N
S1, N
S2: secondary winding
Q
1～Q
4: switch element
D
1～D
4: diode
C
1～C
5: electric capacity
L: inductance
Embodiment
Some exemplary embodiments that embody feature ﹠ benefits of the present invention will be described in detail in the explanation of back segment.Be understood that the present invention can have in different modes various variations, its neither departing from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to limit the present invention.
See also Fig. 1, it is the circuit block diagram of the power supply circuits of preferred embodiment of the present invention.As shown in Figure 1, the power supply circuits 1 of present embodiment receive an input voltage V via one first positive output end 101 and one first negative output terminal 102 of a power supplier 10
In, and export a driving voltage V
oGive at least one light-emitting diode component 11, shinny to drive light-emitting diode component 11, wherein light-emitting diode component 11 can be but is not limited to by a plurality of light-emitting diode G
1Be in series.
In the present embodiment, power supply circuits 1 are via the second positive output end 12 and the second negative output terminal 13 outputting drive voltage V
oGive light-emitting diode component 11.In addition, because the 3rd positive output end 141 of rear class power-switching circuit 14 is connected with the second positive output end 12 of power supply circuits 1, then the 3rd negative output terminal 142 of level power supply change-over circuit 14 is connected with the first positive output end 101 of power supplier 10, and the second negative output terminal 13 of power supply circuits 1 is connected in the first negative output terminal 102 of power supplier 10, therefore by above-mentioned annexation, the second positive output end 12 of power supply circuits 1 and the voltage difference between the second negative output terminal 13 are bucking voltage V
ComAdd input voltage V
In, in other words, the driving voltage V of power supply circuits 1 output
oNamely by bucking voltage V
ComAdd input voltage V
InForm.
As from the foregoing, because power supply circuits 1 export the driving voltage V of light-emitting diode component 11 to
oBy bucking voltage V
ComAdd input voltage V
InForm, therefore corresponding to the light-emitting diode component 11 of different starting resistors, power supply circuits 1 can directly provide light-emitting diode component 11 required most of electric energy by power supplier 10, thus, rear class power-switching circuit 14 just can only need provide required electric energy in the light-emitting diode component 11 change in voltage scopes, and namely rear class power-switching circuit 14 only needs input voltage V
InBe converted to more low level bucking voltage V
ComSo the rear class power-switching circuit compared to traditional power supply circuits need be high level voltage with the voltage transitions that receives, the rear class power-switching circuit 14 of present embodiment has less energy conversion ratios because the electric energy that will receive is converted to low level voltage, just can reduce the electric energy transition loss and raising efficiency with power supply circuits 1, in addition, power supply circuits 1 more can select the low element of withstand voltage amount to reduce its production cost because of the element in the rear class power-switching circuit 14.
For example, comprise 30 light-emitting diode G when light-emitting diode component 11
1, and each light-emitting diode G
1Starting resistor when 3.2V～3.6V, just the starting resistor of light-emitting diode component 11 is between 96V～108V, and if the input voltage V of power supplier 10
InBe 80V, relatively, rear class power-switching circuit 14 just only needs the input voltage V that receives
InConvert the bucking voltage V that voltage level is 16V～28V to
Com, thus, not only light-emitting diode component 11 can be driven shinny, and since rear class power-switching circuit 14 with input voltage V
InBe converted to low level bucking voltage V
ComAnd having lower energy conversion ratios, power supply circuits 1 just can reduce power supply conversion losses and raise the efficiency, simultaneously, because the elements in the rear class power-switching circuit 14 can be selected the lower element of withstand voltage amount, so but also relative reduce of the cost of power supply circuits 1.
In the above-described embodiments, rear class power-switching circuit 14 can be but is not limited to one direct current-DC converting circuit, therefore relatively, the voltage that rear class power-switching circuit 14 receives is a direct current voltage, i.e. the input voltage V that receives through power supplier 10 of rear class power-switching circuit 14
InBe a direct current voltage.In addition, input voltage V
InAlso can be but be not limited to have the voltage of fixed level, and this input voltage V
InLevel can be according to the light-emitting diode G of light-emitting diode component 11
1Number and adjust or set.In addition, in other embodiments, 10 of power suppliers can be a power factor correction circuit, but not as limit.
Below will be take the rear class power-switching circuit of power supply circuits of the present invention as flyback DC-to-DC change-over circuit as demonstration example illustrates technology of the present invention.See also Fig. 2, it is the electrical block diagram of power supply circuits shown in Figure 1.As shown in the figure, control circuit 15 comprises one first control integration circuit (controlintegrated circuit) 151, and then level power supply change-over circuit 14 can be but is not limited to a flyback DC-DC power change-over circuit, and comprises one first transformer T
1, one first switch element Q
1And one first current rectifying and wave filtering circuit 143.Wherein, the first transformer T
1Has one first armature winding N
F1And one first secondary winding N
S1, the first armature winding N
F1The first positive output end 101 and the first switch element Q with power supplier 10
1Connect secondary winding N
S1Be connected the first switch element Q with the first positive output end 101 of the first current rectifying and wave filtering circuit 143 and power supplier 10
1Be serially connected with armature winding N
F1Connect together between the end G, and the first switch element Q
1Control end be connected with the first control integration circuit 151 of control circuit 15, first close to close element Q
1The control of the first control integration circuit 151 of controlled circuit 15 and carry out conducting or cut-off is so that transformer T
1The first armature winding N
F1The electric energy that receives is sent to the first secondary winding N with electromagnetic mode
S1, and in the first secondary winding N
S1Upper generation induction electric energy.
As for 143 couples of the first secondary winding N of the first current rectifying and wave filtering circuit
S1On electric energy carry out rectification and filtering, with output bucking voltage V
ComIn certain embodiments, the first current rectifying and wave filtering circuit 143 can be but is not limited to comprise one first diode D
1And one first capacitor C
1, the first diode D wherein
1Anode tap and the first secondary winding N of the first transformer T1
S1Connect the first diode D
1Cathode terminal then be connected and the first capacitor C with the 3rd positive output end 141 of rear class power-switching circuit 14
1An end and the first diode D
1Cathode terminal and the 3rd positive output end 141 of rear class power-switching circuit 14 connect the first capacitor C
1The other end then be connected with the 3rd negative output terminal 142 of rear class power-switching circuit 14, and be connected with the first positive output end 101 of power supplier 10 through the 3rd negative output terminal 142.
Certainly, rear class power-switching circuit 14 is not limited to and is as mentioned above flyback DC-to-DC change-over circuit, in other embodiments, and as shown in Figure 3, rear class power-switching circuit 14 also can be a step-down/up type DC-to-DC change-over circuit, and comprises a boost inductance L, the 4th switch element Q
4And one the 3rd current rectifying and wave filtering circuit 144.Wherein, the end of boost inductance L system is connected with the first positive output end 101 of power supplier 10, the other end of boost inductance L then with the 4th switch element Q
4An end and the 3rd current rectifying and wave filtering circuit connect 144.The 4th switch Q
4Other end system meet together end G and connect, and the 4th switch Q
4Control end be connected with the first control integration circuit 151 of control circuit 15, the 4th close to close element Q
4The control of the first control integration circuit 151 of controlled circuit 15 and carry out conducting or cut-off, so that boost inductance L boosts the electric energy that receives, receive electric energy after the boosting that boost inductance L transmits as for 144 of the 3rd current rectifying and wave filtering circuits, and the electric energy after boosting carried out rectification and filtering, with output bucking voltage V
Com
In certain embodiments, the 3rd current rectifying and wave filtering circuit 144 can be but is not limited to comprise one the 4th diode D
4And one the 5th capacitor C
5, the 4th diode D wherein
4Anode tap be connected the 4th diode D with boost inductance L
4Cathode terminal then be connected and the 5th capacitor C with the 3rd positive output end 141 of rear class power-switching circuit 14
5An end and the 4th diode D
4Cathode terminal and the 3rd positive output end 141 of rear class power-switching circuit 14 connect the 5th capacitor C
5The other end then be connected with rear class power-switching circuit 14 the 3rd negative output terminal 142, and be connected with the first positive output end 101 of power supplier 10 through the 3rd negative output terminal 142.
In certain embodiments, as shown in Figure 4, power supply circuits 1 more can be connected with a plurality of light-emitting diode components parallel with one another 11, shinny to drive simultaneously a plurality of light-emitting diode component 11, in addition, for the brightness that makes each light-emitting diode component 11 all identical, power supply circuits 1 more can be but are not limited to have a flow equalizing circuit 16, flow equalizing circuit 16 is connected with the 3rd positive output end 141 and a plurality of light-emitting diode component 11 of rear class power-switching circuit 141, it is in order to the size of current of a plurality of light-emitting diode components 11 of balance, and then makes the brightness of each light-emitting diode component 11 all identical.
See also Fig. 5, it is for the power supply circuits of another preferred embodiment of the present invention.As shown in the figure, the structural similarity of the structure of the power supply circuits 4 of present embodiment and power supply circuits 1 shown in Figure 1, so element representative structure and the functional similarity of same-sign.Compared to power supply circuits shown in Figure 11, the power supply circuits 4 of present embodiment have more a prime power-switching circuit 51, be connected between power supplier 10 and the rear class power-switching circuit 14, and be connected with control circuit 15, and having one the 4th positive output end 511 and the 4th negative output terminal 512, this prime power-switching circuit 51 is in order to receive the input voltage V that is transmitted by power supplier 10
In, and the control by control circuit 15 is with input voltage V
InBe converted to a transient voltage V
In', to export this transient voltage V through the 4th positive output end 511 and the 4th negative output terminal 512
In', then 14 of level power supply change-over circuits change into and receive transient voltage V
In', and be converted to bucking voltage V
ComIn addition, compared to power supply circuits shown in Figure 11, the second negative output terminal 13 of the power supply circuits 4 of present embodiment changes with the 4th negative output terminal 512 of prime power-switching circuit 51 and is connected, then 142 of the 3rd negative output terminals of level power supply change-over circuit 14 change with the 4th positive output end 511 of prime power-switching circuit 51 and are connected, thus, power supply circuits 4 offer the driving voltage V of light-emitting diode component 11
oChange by bucking voltage V
ComAdd transient voltage V
In' form.
Similar to power supply circuits 1 shown in Figure 1, because the power supply circuits 4 of present embodiment export the driving voltage V of light-emitting diode component 11 to
oBe bucking voltage V
ComAdd transient voltage V
In' form, therefore corresponding to the light-emitting diode component 11 of different starting resistors, power supply circuits 4 just can be by the transient voltage V of prime power-switching circuit 51 outputs
In' directly provide light-emitting diode component 11 required most of electric energy, thus, rear class power-switching circuit 14 just can only need provide required electric energy in the light-emitting diode component 11 change in voltage scopes, and namely rear class power-switching circuit 14 only needs transient voltage V
In' be converted to low level bucking voltage V
ComSo the rear class power-switching circuit compared to traditional power supply circuits need be high level voltage with the voltage transitions that receives, the rear class power-switching circuit 14 of present embodiment has less energy conversion ratios because the electric energy that will receive is converted to low level voltage, so power supply circuits 4 can reduce the electric energy transition loss and raising efficiency, in addition, power supply circuits 4 more can select the low element of withstand voltage amount to reduce its production cost because of the element in the rear class power-switching circuit 14.
In the above-described embodiments, prime power-switching circuit 51 can be but is not limited to an AC-DC change-over circuit, therefore relatively, the electric energy that prime power-switching circuit 51 receives is an alternating voltage, and namely front level power supply electricity changes the input voltage V that circuit 51 receives through power supplier 10
InIt is an alternating voltage.
Below will be take the prime power-switching circuit of power supply circuits as a half-bridge AC-DC change-over circuit as demonstration example illustrates technology of the present invention.See also Fig. 6, it is the electrical block diagram of power supply circuits shown in Figure 5.As shown in the figure, rear class power-switching circuit 14 can be but is not limited to a flyback DC-to-DC change-over circuit, and it has the first transformer T
1, the first switch element Q
1And first current rectifying and wave filtering circuit 143, and the structure of described element and function have been specified among the embodiment shown in Figure 2 all, so do not giving unnecessary details in this.
The second capacitor C
2An end be connected in second switch element Q
2And the 3rd switch element Q
3Between, the second capacitor C
2In order to filtering.The second transformer T
2Has the second armature winding N
F2And second subprime winding N
S2, the second armature winding N wherein
F2Two ends respectively with the second capacitor C
2The other end and meet altogether end G and connect, and this second subprime winding N
F2Have centre cap and be connected in and meet altogether end G, the second transformer T
2In second switch element Q
2And the 3rd switch element Q
3Staggered conducting or when cut-off make the second armature winding N
F2The electric energy that receives is sent to second subprime winding N with electromagnetic mode
S2, and in second subprime winding N
S2Upper generation induction electric energy.
As for 514 of the second current rectifying and wave filtering circuits and the second transformer T
2Second subprime winding N
S2, prime power-switching circuit 51 the 4th positive output end 511 and the 4th negative output terminal 512 connect, in order to rectification and filtering.And in certain embodiments, the second current rectifying and wave filtering circuit 514 can be but is not limited to comprise one second diode D
2, one the 3rd diode D
3And one the 4th capacitor C
4, the second diode D wherein
2And the 3rd diode D
3Anode tap be connected to the second transformer T
2Second subprime winding N
S2Two ends, and the second diode D
2And the 3rd diode D
3Cathode terminal then interconnect the 4th capacitor C
4An end and the second diode D
2And the 3rd diode D
3Cathode terminal and the 4th positive output end 511 of prime power-switching circuit 51 connect and the 4th capacitor C
4The other end then with the 4th negative output terminal 512 of prime power-switching circuit 51 and meet altogether end G and be connected.
In sum, because the power supply circuits of light-emitting diode of the present invention offer the driving voltage major part of light-emitting diode component and are provided by the voltage source that need not change, so that the rear class power-switching circuit that is connected with light-emitting diode component need be that low level voltage has less energy conversion ratios with the voltage transitions that receives only, therefore the rear class power-switching circuit compared to traditional power supply circuits need be high level voltage with the voltage transitions that receives, power supply circuits of the present invention just can because have less electric energy transition loss raising efficiency, also can be selected the lower element of withstand voltage amount because of the element in the rear class power-switching circuit and reduce cost simultaneously.
The present invention must be appointed by those of ordinary skills and executes that the craftsman thinks and be to modify as all, right neither scope of taking off such as the wish protection of attached claim institute.
Claims (26)
1. power supply circuits receive an input voltage by one first positive output end and one first negative output terminal of a power supplier, and export a driving voltage at least one light-emitting diode component, and these power supply circuits comprise:
One second positive output end is connected with an end of described light-emitting diode component;
One second negative output terminal is connected with the other end and this first negative output terminal of described light-emitting diode component;
One rear class power-switching circuit, in order to receive this input voltage and to be converted to a bucking voltage, and have one the 3rd positive output end and one the 3rd negative output terminal, the 3rd positive output end is connected with this second positive output end, and the 3rd negative output terminal is connected with this first positive output end; And
One control circuit is connected with this rear class power-switching circuit and described light-emitting diode component, in order to detect and to control the size of current of described light-emitting diode component, the electric current of this light-emitting diode component is kept necessarily;
Wherein, these power supply circuits are exported this driving voltage by this second positive output end and this second negative output terminal, and this driving voltage system is formed by this input voltage and this bucking voltage addition.
2. power supply circuits as claimed in claim 1, wherein said light-emitting diode component is formed by a plurality of light-emitting diodes serial connections.
3. power supply circuits as claimed in claim 2, the starting resistor of wherein said light-emitting diode component is in a scope.
4. power supply circuits as claimed in claim 1, wherein this input voltage is a direct current voltage.
5. power supply circuits as claimed in claim 1, wherein this rear class power-switching circuit is a flyback DC-to-DC change-over circuit or a step-down/up type DC-to-DC change-over circuit.
6. power supply circuits as claimed in claim 1, wherein this control circuit comprises a control integration circuit.
7. power supply circuits as claimed in claim 6, wherein this rear class power-switching circuit comprises a switch element, and this switch element is connected with this control integration circuit of this control circuit, and it is subjected to the control of this control circuit and carries out conducting or cut-off.
8. power supply circuits as claimed in claim 7, wherein this rear class power-switching circuit comprises a transformer, this transformer has an armature winding and a level winding, and wherein this armature winding is connected with this first positive output end and this switch element of this power supplier.
9. power supply circuits as claimed in claim 8, wherein this rear class power-switching circuit comprises a current rectifying and wave filtering circuit, is connected with this secondary winding of this transformer, in order to rectification and filtering.
10. power supply circuits as claimed in claim 9, wherein this current rectifying and wave filtering circuit comprises a diode and an electric capacity.
11. power supply circuits as claimed in claim 7, wherein this rear class power-switching circuit comprises a boost inductance, and wherein an end of this boost inductance is connected with this first positive output end of this power supplier, and the other end of this boost inductance is connected with this switch element.
12. power supply circuits as claimed in claim 11, wherein this rear class power-switching circuit comprises a current rectifying and wave filtering circuit, is connected with the other end of this boost inductance, in order to rectification and filtering.
13. power supply circuits as claimed in claim 1, wherein these power supply circuits have more a flow equalizing circuit, be connected with the 3rd positive output end of this rear class power-switching circuit and described light-emitting diode component parallel with one another, it is in order to the size of current of the described light-emitting diode component of balance.
14. power supply circuits as claimed in claim 1, wherein this power supplier is a power factor correction circuit.
15. power supply circuits receive an input voltage, and export a driving voltage at least one light-emitting diode component, these power supply circuits comprise:
One prime power-switching circuit receives this input voltage and is converted to a transient voltage, and has one first positive output end and the first negative output terminal;
One second positive output end is connected with an end of described light-emitting diode component;
One second negative output terminal is connected with the other end and this first negative output terminal of described light-emitting diode component;
One rear class power-switching circuit, be connected with this prime power-switching circuit, in order to receive this transient voltage and to be converted to a bucking voltage, and have one the 3rd positive output end and one the 3rd negative output terminal, the 3rd positive output end is connected with this second positive output end, and the 3rd negative output terminal is connected with this first positive output end; And
One control circuit is connected with this rear class power-switching circuit and described light-emitting diode component, in order to detect and to control the size of current of described light-emitting diode component, the electric current of this light-emitting diode component is kept necessarily;
Wherein, these power supply circuits are exported this driving voltage by this second positive output end and this second negative output terminal, and this driving voltage is formed by this transient voltage and this bucking voltage addition.
16. power supply circuits as claimed in claim 15, wherein this input voltage is an alternating voltage.
17. power supply circuits as claimed in claim 16, wherein this prime power-switching circuit is a half-bridge change-over circuit.
18. power supply circuits as claimed in claim 15, wherein this control circuit comprises one first control integration circuit and one second control integration circuit.
19. power supply circuits as claimed in claim 18, wherein this rear class power-switching circuit comprises one first switch element, one first transformer and one first current rectifying and wave filtering circuit, this first switch element is connected with this first control integration circuit of this control circuit, and it is subjected to the control of this first control integration circuit and carries out conducting or cut-off.
20. power supply circuits as claimed in claim 18, wherein this prime power-switching circuit comprises a rectifier, in order to this input voltage is carried out rectification.
21. power supply circuits as claimed in claim 20, wherein this prime power-switching circuit comprises a second switch element and one the 3rd switch element, this second switch element and the 3rd switch element system is connected with this second control integration circuit of this control circuit, and this second switch element and the 3rd switch element are subjected to the control of this second control integration circuit and interlock and carry out conducting or cut-off.
22. power supply circuits as claimed in claim 21, wherein this prime power-switching circuit comprises one first electric capacity, and an end of this first electric capacity is connected with this second switch element and the 3rd switch element, and this first electric capacity is in order to filtering.
23. power supply circuits as claimed in claim 22, wherein this prime power-switching circuit comprises the second transformer, this second transformer has an armature winding and a level winding, wherein the two ends of this armature winding respectively with this first electric capacity and connect altogether the end be connected.
24. power supply circuits as claimed in claim 23, wherein this prime power-switching circuit comprises one second current rectifying and wave filtering circuit, is connected with this secondary winding of this second transformer, in order to rectification and filtering.
25. power supply circuits as claimed in claim 24, wherein this second current rectifying and wave filtering circuit comprises a plurality of diodes and one second electric capacity.
26. power supply circuits as claimed in claim 23, wherein this secondary winding has centre cap and is connected in this and connects altogether end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101394847A CN101932155B (en) | 2009-06-24 | 2009-06-24 | Power supply circuit of light-emitting diode |
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| CN2009101394847A CN101932155B (en) | 2009-06-24 | 2009-06-24 | Power supply circuit of light-emitting diode |
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| CN101932155A CN101932155A (en) | 2010-12-29 |
| CN101932155B true CN101932155B (en) | 2013-04-17 |
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| TWI682634B (en) * | 2018-11-06 | 2020-01-11 | 崛智科技有限公司 | Integrated circuitry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369525B1 (en) * | 2000-11-21 | 2002-04-09 | Philips Electronics North America | White light-emitting-diode lamp driver based on multiple output converter with output current mode control |
| CN101394699A (en) * | 2007-09-18 | 2009-03-25 | 通嘉科技股份有限公司 | LED driving device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369525B1 (en) * | 2000-11-21 | 2002-04-09 | Philips Electronics North America | White light-emitting-diode lamp driver based on multiple output converter with output current mode control |
| CN101394699A (en) * | 2007-09-18 | 2009-03-25 | 通嘉科技股份有限公司 | LED driving device |
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| CN101932155A (en) | 2010-12-29 |
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