CN104284490A - LED drive circuit and refrigerator - Google Patents
LED drive circuit and refrigerator Download PDFInfo
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- CN104284490A CN104284490A CN201410528363.2A CN201410528363A CN104284490A CN 104284490 A CN104284490 A CN 104284490A CN 201410528363 A CN201410528363 A CN 201410528363A CN 104284490 A CN104284490 A CN 104284490A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses an LED drive circuit. The LED drive circuit comprises an LED illuminating lamp, a work voltage input end, a PWM input end for inputting PWM signals with the duty ratio becoming larger gradually within the preset time, a drive module for outputting stable supply voltage to the LED illuminating lamp according to the PWM signals and a current detection module for detecting the current across the LED illuminating lamp and outputting the detection voltage to the drive module. The invention further discloses a refrigerator. The refrigerator comprises the LED drive circuit. By means of the LED drive circuit and the refrigerator, the stable supply voltage can be output to power the LED illuminating lamp so that the current across the LED illuminating lamp can be changed stably, when a user opens the door of the refrigerator, the LED illuminating lamp can become lighter gradually in the preset time, the stability of the LED drive circuit in outputting the current is improved, the service life of the LED lamp can be prolonged, and the quality of the refrigerator is improved.
Description
Technical field
The present invention relates to LED Driving technique field, particularly relate to a kind of LED drive circuit and refrigerator.
Background technology
The brightness of LED (Light Emitting Diode, light-emitting diode) lamp determines primarily of the electric current flowing through it, and usually within the specific limits, electric current is larger, and LED brightness is higher.The interior illumination lamp that current refrigerator uses is mostly low-power LED lamp, electric current needed for low-power LED lamp little (about 10 ~ 20mA), required precision is not high, but brightness is low, the needs of the user that the LED that do not meet the demands brightness is high, for solving the problem, those skilled in the art are using high-powered LED lamp or the LED area light source illuminating lamp as refrigerator interior trim, but the drive current needed for LED area light source or high-powered LED lamp large (being generally 300mA ~ 1.5A), precision is high, the drive circuit of existing LED area light source and high-powered LED lamp uses large power triode drive circuit usually, but the efficiency of large power triode drive circuit is lower, and output current is unstable, the brightness of high-powered LED lamp or LED area light source is caused easily to change, namely high-powered LED lamp or LED area light source flickering, illuminating lamp is caused easily to damage, affect the quality of refrigerator.
Summary of the invention
Main purpose of the present invention is the stability improving LED drive circuit output current, extends the life-span of LED illumination lamp, promotes the quality of refrigerator.
In order to achieve the above object, the invention provides a kind of LED drive circuit, described LED drive circuit comprise LED illumination lamp, operating voltage input, for input the pwm signal that duty ratio in Preset Time increases gradually PWM input, for according to the supply power voltage of described pwm signal stable output to the driver module of described LED illumination lamp, and for detect the electric current that flows through described LED illumination lamp and output detections voltage to the current detection module of described driver module;
The input of described driver module is connected with described operating voltage input, and the PWM control end of described driver module is connected with described PWM input, and the output of described driver module is connected with the positive pole of described LED illumination lamp; The input of described current detection module is connected with the negative pole of described LED illumination lamp, and the output of described current detection module is connected with the pressure feedback port of described driver module.
Preferably, described driver module comprises driving governor and the first resistance, described driving governor comprise power pins, pin, switch control pin, output pin and Voltage Feedback pin;
Described power pins is connected with described operating voltage input, described ground pin ground connection, described switch control pin is connected with described PWM input via described first resistance, described output pin is connected with the positive pole of described LED illumination lamp, and described Voltage Feedback pin is connected with the output of described current detection module.
Preferably, described current detection module comprises the second resistance, and one end of described second resistance is connected with the negative pole of described LED illumination lamp, and is connected with the Voltage Feedback pin of described driving governor, the other end ground connection of described second resistance.
Preferably, described LED drive circuit also comprises the input filter module for carrying out filtering to the operating voltage of described operating voltage input input, the input of described input filter module is connected with described operating voltage input, and the output of described input filter module is connected with the power pins of described driving governor.
Preferably, described input filter module comprises the first electric capacity and the second electric capacity; One end of described first electric capacity is connected with described operating voltage input, and is connected with the power pins of described driving governor, the other end ground connection of described first electric capacity; The positive pole of described second electric capacity is connected with described operating voltage input, and is connected with the power pins of described driving governor, the minus earth of described second electric capacity.
Preferably, the described LED drive circuit supply power voltage also comprised for exporting described driver module carries out the Voltage stabilizing module of voltage stabilizing process, the input of described Voltage stabilizing module is connected with the output pin of described driving governor, and the output of described Voltage stabilizing module is connected with the positive pole of described LED illumination lamp.
Preferably, Voltage stabilizing module comprises inductance and diode; The first end of described inductance is connected with the output pin of described driving governor, and the second end of described inductance is connected with the positive pole of described LED illumination lamp; The negative electrode of described diode is connected with the output pin of described driving governor, the plus earth of described diode.
Preferably, described LED drive circuit also comprises the output filtering module for carrying out filtering to the supply power voltage after described Voltage stabilizing module voltage stabilizing process, the input of described output filtering module is connected with the output of described Voltage stabilizing module, and the output of described output filtering module is connected with the positive pole of described LED illumination lamp.
Preferably, described output filtering module comprises the 3rd electric capacity and the 4th electric capacity; Described one end of 3rd electric capacity is connected with the second end of described inductance, and is connected with the positive pole of described LED illumination lamp, the other end ground connection of described 3rd electric capacity; The described positive pole of the 4th electric capacity is connected with the second end of described inductance, and is connected with the positive pole of described LED illumination lamp, the minus earth of described 4th electric capacity.
In addition, in order to achieve the above object, the present invention also provides a kind of refrigerator, described refrigerator comprises LED drive circuit, described LED drive circuit comprise LED illumination lamp, operating voltage input, for input the pwm signal that duty ratio in Preset Time increases gradually PWM input, for according to the supply power voltage of described pwm signal stable output to the driver module of described LED illumination lamp, and for detect the electric current that flows through described LED illumination lamp and output detections voltage to the current detection module of described driver module;
The input of described driver module is connected with described operating voltage input, and the PWM control end of described driver module is connected with described PWM input, and the output of described driver module is connected with the positive pole of described LED illumination lamp; The input of described current detection module is connected with the negative pole of described LED illumination lamp, and the output of described current detection module is connected with the pressure feedback port of described driver module.
LED drive circuit provided by the invention and refrigerator, the supply power voltage being controlled driver module stable output by PWM input input pwm signal is powered to LED illumination lamp, and the duty ratio of pwm signal increases gradually in Preset Time, driver module is made to export the power supply voltage range of LED illumination lamp to large, and the electric current making to flow through LED illumination lamp can steady change, improve the stability of LED drive circuit output current, the life-span of LED illumination lamp can be extended, promote the quality of refrigerator.And user can be realized when starting the door opening refrigerator, the brightness of LED illumination lamp brightens gradually in Preset Time, has not only met user's high brightness needs but also non-harm users eyes, has improved the quality of refrigerator further.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of LED drive circuit preferred embodiment of the present invention.
The realization of object of the present invention, functional characteristics and advantage, will in conjunction with the embodiments, and be described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of LED drive circuit, the present invention is applied to refrigerator for LED drive circuit and is described, and this LED drive circuit can also be applied to other electronic equipment, and this is not restricted.
With reference to the electrical block diagram that Fig. 1, Fig. 1 are LED drive circuit preferred embodiment of the present invention.
In present pre-ferred embodiments, described LED drive circuit comprises LED illumination lamp 10 (as high-powered LED lamp or LED area light source), operating voltage input VIN, PWM input PWM_IN, driver module 20 and current detection module 30.The pwm signal Vpwm that PWM input PWM_IN increases gradually for inputting Preset Time (as 5s) interior duty ratio, driver module 20 for according to the supply power voltage of pwm signal Vpwm stable output to LED illumination lamp 10, current detection module 30 for detect flow through LED illumination lamp 10 electric current I led output detections voltage to driver module 20.
The input of driver module 20 is connected with operating voltage input VIN, and the PWM control end of driver module 20 is connected with PWM input PWM_IN, and the output of driver module 20 is connected with the positive pole LED+ of LED illumination lamp 10; The input of current detection module 30 is connected with the negative pole LED-of LED illumination lamp 10, and the output of current detection module 30 is connected with the pressure feedback port of driver module 20.
In the present embodiment, PWM input PWM_IN is used for the PWM delivery outlet (not shown) of master controller in connecting refrigerator, the pwm signal Vpwm that the PWM delivery outlet receiving master controller exports, driver module 20 exports supply power voltage to LED illumination lamp 10 according to pwm signal Vpwm, required supply power voltage is provided to LED illumination lamp 10, current detection module 30 detect flow through the electric current I led of LED illumination lamp 10 and output detections voltage to driver module 20, to be adapted to the size of adjustment supply power voltage according to the size of this detection voltage by driver module 20, supply power voltage is stablized, output current can steady change, namely make the electric current I led flowing through LED illumination lamp 10 can steady change.
LED drive circuit of the present invention, the supply power voltage being inputted pwm signal Vpwm control driver module 20 stable output by PWM input PWM_IN is powered to LED illumination lamp 10, and the duty ratio of pwm signal Vpwm increases gradually in Preset Time, driver module 20 is made to export the power supply voltage range of LED illumination lamp 10 to large, and the electric current making to flow through LED illumination lamp 10 can steady change, namely the electric current flowing through LED illumination lamp 10 in Preset Time increases and steady change gradually, improve the stability of LED drive circuit output current, the life-span of LED illumination lamp 10 can be extended, promote the quality of refrigerator.And user can be realized when starting the door opening refrigerator, the brightness of LED illumination lamp 10 brightens gradually in Preset Time, has not only met user's high brightness needs but also non-harm users eyes, has improved the quality of refrigerator further.
As shown in Figure 1, driver module 20 comprise driving governor U1 and the first resistance R1, driving governor U1 comprise power pins VCC, pin GND, switch control pin STBY, output pin OUT and Voltage Feedback pin INV.
Power pins VCC is connected with operating voltage input VIN, ground pin GND ground connection, switch control pin STBY is connected with PWM input PWM_IN via the first resistance R1, output pin OUT is connected with the positive pole LED+ of LED illumination lamp 10, and Voltage Feedback pin INV is connected with the output of current detection module 30.
As shown in Figure 1, current detection module 30 comprises the second resistance R2, and one end of the second resistance R2 is connected with the negative pole LED-of LED illumination lamp 10, and is connected with the Voltage Feedback pin INV of driving governor U1, the other end ground connection of the second resistance R2.Second resistance R2 flows through the electric current I led of LED illumination lamp 10 as detecting, namely detect the detection resistance of the output current of LED drive circuit, require that the precision of the second resistance R2 is high, preferably, the second resistance R2 selects cement resistor to the present embodiment.
As shown in Figure 1, LED drive circuit also comprises input filter module 40, input filter module 40 carries out filtering for the operating voltage (as 12V) inputted operating voltage input VIN, the input of input filter module 40 is connected with operating voltage input VIN, and the output of input filter module 40 is connected with the power pins VCC of driving governor U1.
Particularly, input filter module 40 comprises the first electric capacity C1 and the second electric capacity C2, and wherein, the second electric capacity C2 is electrochemical capacitor; One end of first electric capacity C1 is connected with operating voltage input VIN, and is connected with the power pins VCC of driving governor U1, the other end ground connection of the first electric capacity C1; The positive pole of the second electric capacity C2 is connected with operating voltage input VIN, and is connected with the power pins VCC of driving governor U1, the minus earth of the second electric capacity C2.
As shown in Figure 1, LED drive circuit also comprises Voltage stabilizing module 50, Voltage stabilizing module 50 carries out voltage stabilizing process for the supply power voltage exported driver module 20, the input of Voltage stabilizing module 50 is connected with the output pin OUT of driving governor U1, and the output of Voltage stabilizing module 50 is connected with the positive pole LED+ of LED illumination lamp 10.
Particularly, Voltage stabilizing module 50 comprises inductance L 1 and diode D1, and carry out voltage stabilizing by inductance L 1 and diode D1 to the supply power voltage that driving governor U1 exports, the supply power voltage that driving governor U1 is exported is stablized, the outputting current steadily of LED drive circuit; The first end of inductance L 1 is connected with the output pin OUT of driving governor U1, and the second end of inductance L 1 is connected with the positive pole LED+ of LED illumination lamp 10; The negative electrode of diode D1 is connected with the output pin OUT of driving governor U1, the plus earth of diode D1.
As shown in Figure 1, LED drive circuit also comprises output filtering module 60, output filtering module 60 is for carrying out filtering to the supply power voltage after Voltage stabilizing module 50 voltage stabilizing process, the input of output filtering module 60 is connected with the output of Voltage stabilizing module 50, and the output of output filtering module 60 is connected with the positive pole LED+ of LED illumination lamp 10.
Particularly, output filtering module 60 comprises the 3rd electric capacity C3 and the 4th electric capacity C4, and wherein, the 4th electric capacity C4 is electrochemical capacitor; One end of 3rd electric capacity C3 is connected with the second end of inductance L 1, and is connected with the positive pole LED+ of LED illumination lamp 10, the other end ground connection of the 3rd electric capacity C3; The positive pole of the 4th electric capacity C4 is connected with the second end of inductance L 1, and is connected with the positive pole LED+ of LED illumination lamp 10, the minus earth of the 4th electric capacity C4.
The operation principle of LED drive circuit of the present invention specifically describes as follows:
In LED drive circuit, operating voltage (as 12V) needed for working from operating voltage input VIN input queued switches controller U1, first electric capacity C1 and the second electric capacity C2 carries out filtering to the operating voltage that operating voltage input VIN inputs, make the stable operating voltage of the power pins VCC being input to driving governor U1, make driving governor U1 can steady operation.Driving governor U1 obtains electric rear normal work, the PWM delivery outlet output pwm signal Vpwm of master controller in refrigerator, this pwm signal Vpwm is input to LED drive circuit from PWM input PWM_IN, the pwm signal Vpwm inputted from PWM input PWM_IN to be input to the switch control pin STBY of driving governor U1 through the first resistance R1, first resistance R1 carries out current limliting to pwm signal Vpwm, avoids driving governor U1 impaired.When pwm signal Vpwm is high level, the output pin OUT of driving governor U1 has supply power voltage to export, supply power voltage through inductance L 1 and diode D1 voltage stabilizing, then exports the positive pole LED+ of LED illumination lamp 10 to after the 3rd electric capacity C3 and the 4th electric capacity C4 filtering, powers to LED illumination lamp 10; Inductance L 1 pair of supply power voltage carries out energy storage simultaneously, when pwm signal Vpwm is low level, the output pin OUT of driving governor U1 does not have voltage to export, and the supply power voltage that now inductance L 1 stores discharges to the 4th electric capacity C4, makes LED illumination lamp 10 continue have supply power voltage to power.
Because the duty ratio being input to the pwm signal Vpwm of the switch control pin STBY of driving governor U1 increases gradually in Preset Time (as 5s), therefore the supply power voltage exported from the output pin OUT of driving governor U1 increases gradually in Preset Time, the output current of LED drive circuit increases gradually in Preset Time, and LED illumination lamp 10 is brightened gradually in Preset Time.The embodiment of the present invention is preset when user opens the door of refrigerator, and the duty ratio of pwm signal Vpwm increases gradually in Preset Time, exceedes the duty ratio of pwm signal Vpwm after Preset Time constant.Take Preset Time as 5s be example, when user opens the door of refrigerator, the duty ratio of pwm signal Vpwm increases gradually in 5s, the supply power voltage exported from the output pin OUT of driving governor U1 increases gradually in 5s, the output current of LED drive circuit increases gradually in 5s, LED illumination lamp 10 by secretly brightening gradually, makes the intensity of user adaptation LED illumination lamp 10 light in 5s, crosses the bright and eyes of harm users to avoid the Men Shiyin LED illumination lamp 10 opening refrigerator user; Open the door 5s of refrigerator user after, the outputting current steadily of LED drive circuit, LED illumination lamp 10 brightness no longer changes.
In LED illumination lamp 10 course work process, the second resistance R2 in current detection module 30 detects the electric current I led flowing through LED illumination lamp 10, the electric current I led flowing through LED illumination lamp 10 also flows through the second resistance R2, and on the second resistance R2, produce detection voltage, this detection voltage exports the Voltage Feedback pin INV of driving governor U1 to, thus when the supply power voltage that driving governor U1 exports changes, the detection voltage that second resistance R2 feeds back to driving governor U1 also changes, now driving governor U1 can adapt to the size of adjustment supply power voltage according to the situation of change detecting voltage, the supply power voltage exporting LED illumination lamp 10 to is stablized, namely the electric current I led making to flow through LED illumination lamp 10 can steady change, guarantee that the brightness of LED illumination lamp 10 ANOMALOUS VARIATIONS does not occur.
The present invention also provides a kind of refrigerator, and this refrigerator comprises LED drive circuit, and the circuit structure of this LED drive circuit, operation principle and the beneficial effect that brings, all with reference to above-described embodiment, repeat no more herein.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a LED drive circuit, it is characterized in that, described LED drive circuit comprise LED illumination lamp, operating voltage input, for input the pwm signal that duty ratio in Preset Time increases gradually PWM input, for according to the supply power voltage of described pwm signal stable output to the driver module of described LED illumination lamp, and for detect the electric current that flows through described LED illumination lamp and output detections voltage to the current detection module of described driver module;
The input of described driver module is connected with described operating voltage input, and the PWM control end of described driver module is connected with described PWM input, and the output of described driver module is connected with the positive pole of described LED illumination lamp; The input of described current detection module is connected with the negative pole of described LED illumination lamp, and the output of described current detection module is connected with the pressure feedback port of described driver module.
2. LED drive circuit as claimed in claim 1, it is characterized in that, described driver module comprises driving governor and the first resistance, described driving governor comprise power pins, pin, switch control pin, output pin and Voltage Feedback pin;
Described power pins is connected with described operating voltage input, described ground pin ground connection, described switch control pin is connected with described PWM input via described first resistance, described output pin is connected with the positive pole of described LED illumination lamp, and described Voltage Feedback pin is connected with the output of described current detection module.
3. LED drive circuit as claimed in claim 2, it is characterized in that, described current detection module comprises the second resistance, and one end of described second resistance is connected with the negative pole of described LED illumination lamp, and be connected with the Voltage Feedback pin of described driving governor, the other end ground connection of described second resistance.
4. LED drive circuit as claimed in claim 2, it is characterized in that, described LED drive circuit also comprises the input filter module for carrying out filtering to the operating voltage of described operating voltage input input, the input of described input filter module is connected with described operating voltage input, and the output of described input filter module is connected with the power pins of described driving governor.
5. LED drive circuit as claimed in claim 4, it is characterized in that, described input filter module comprises the first electric capacity and the second electric capacity; One end of described first electric capacity is connected with described operating voltage input, and is connected with the power pins of described driving governor, the other end ground connection of described first electric capacity; The positive pole of described second electric capacity is connected with described operating voltage input, and is connected with the power pins of described driving governor, the minus earth of described second electric capacity.
6. LED drive circuit as claimed in claim 2, it is characterized in that, the described LED drive circuit supply power voltage also comprised for exporting described driver module carries out the Voltage stabilizing module of voltage stabilizing process, the input of described Voltage stabilizing module is connected with the output pin of described driving governor, and the output of described Voltage stabilizing module is connected with the positive pole of described LED illumination lamp.
7. LED drive circuit as claimed in claim 6, it is characterized in that, Voltage stabilizing module comprises inductance and diode; The first end of described inductance is connected with the output pin of described driving governor, and the second end of described inductance is connected with the positive pole of described LED illumination lamp; The negative electrode of described diode is connected with the output pin of described driving governor, the plus earth of described diode.
8. LED drive circuit as claimed in claim 7, it is characterized in that, described LED drive circuit also comprises the output filtering module for carrying out filtering to the supply power voltage after described Voltage stabilizing module voltage stabilizing process, the input of described output filtering module is connected with the output of described Voltage stabilizing module, and the output of described output filtering module is connected with the positive pole of described LED illumination lamp.
9. LED drive circuit as claimed in claim 8, it is characterized in that, described output filtering module comprises the 3rd electric capacity and the 4th electric capacity; Described one end of 3rd electric capacity is connected with the second end of described inductance, and is connected with the positive pole of described LED illumination lamp, the other end ground connection of described 3rd electric capacity; The described positive pole of the 4th electric capacity is connected with the second end of described inductance, and is connected with the positive pole of described LED illumination lamp, the minus earth of described 4th electric capacity.
10. a refrigerator, is characterized in that, described refrigerator comprises the LED drive circuit in claim 1 to 9 described in any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528363.2A CN104284490A (en) | 2014-10-09 | 2014-10-09 | LED drive circuit and refrigerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528363.2A CN104284490A (en) | 2014-10-09 | 2014-10-09 | LED drive circuit and refrigerator |
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| CN104284490A true CN104284490A (en) | 2015-01-14 |
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| CN201410528363.2A Pending CN104284490A (en) | 2014-10-09 | 2014-10-09 | LED drive circuit and refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108112118A (en) * | 2017-12-15 | 2018-06-01 | 上海昭关照明实业有限公司 | The startup method, apparatus and LED lamp component of lighting apparatus |
| CN111536752A (en) * | 2020-05-08 | 2020-08-14 | 珠海格力电器股份有限公司 | Control device of indicator light, electrical equipment and control method of indicator light |
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| CN203814020U (en) * | 2014-04-29 | 2014-09-03 | 武汉大学 | Dimmable LED driver chip with soft start and undervoltage locking circuit |
| CN204180342U (en) * | 2014-10-09 | 2015-02-25 | 合肥美的电冰箱有限公司 | LED drive circuit and refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108112118A (en) * | 2017-12-15 | 2018-06-01 | 上海昭关照明实业有限公司 | The startup method, apparatus and LED lamp component of lighting apparatus |
| CN111536752A (en) * | 2020-05-08 | 2020-08-14 | 珠海格力电器股份有限公司 | Control device of indicator light, electrical equipment and control method of indicator light |
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