CN100446370C - Power supply control circuit with selecting current-limiting mode function - Google Patents
Power supply control circuit with selecting current-limiting mode function Download PDFInfo
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- CN100446370C CN100446370C CNB2004100988703A CN200410098870A CN100446370C CN 100446370 C CN100446370 C CN 100446370C CN B2004100988703 A CNB2004100988703 A CN B2004100988703A CN 200410098870 A CN200410098870 A CN 200410098870A CN 100446370 C CN100446370 C CN 100446370C
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- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000004224 protection Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Abstract
The present invention discloses a control circuit with the function of current-limiting mode selection for a power supply. A power output circuit of the power supply is provided with a current-limiting comparison circuit under the precondition of limiting an energy reference. A user can switch and determine the current-limiting comparison circuit to be in a one-to-one mode, a one-to-many mode, a many-to-many mode or a many-to-one mode by himself through a selecting circuit, so that loads are compared singly or compared with being combined to the current-limiting comparison circuit. Therefore, aiming for electric usage states of different load combinations, the user can carry out switching and selection under the condition of a single power supply by himself without manufacturing power supplies of different specifications.
Description
Technical field
The present invention relates to a kind of power supply control circuit of selecting current-limiting mode function that possesses, particularly a kind ofly apply to possess the current limliting comparison circuit and control power supply unit whether overload restriction energy reference load and the decision normal output power of power supply unit or close the selection circuit of output power.
Background technology
The motherboard of general computer and inner ancillary equipment (as soft Winchester disk drive, rigid Winchester disk drive, CD-ROM drive, radiator fan etc.) thereof, its employed direct voltage difference, therefore, the galvanic power supply unit in inside in order to the supply main frame must be exported at least two kinds of different direct currents, to satisfy the different voltage requirements of various device in the main frame.
Recent computer system; because the user is more and more fast for the demand of operating rate; the electric power of the central processing unit of system and ancillary equipment demand also increases thereupon; need provide bigger power output so that be used for the power supply unit of computer system; but different computer systems has different designs; the system design that has is for output port Power Limitation energy reference (peak power output (Max VA)); so just need the many groups of design current limliting comparing unit to meet the user of high-order security regulations demand for this group output port; and in general; as SSI or UL standard; it is the standard that a dangerous energy (Energy Hazard) arranged for the power supply unit of electric equipment; the peak power output of its regulation power supply unit can not surpass 240VA, to protect general computer user's safety.
But changing with each passing day of computer system, especially power demand is more and more big, has only a method if only meet the user of high-order security regulations demand, be exactly further the more with the current limliting comparing unit, to increase its power output, but this is not a good mode eventually, because the current limliting comparing unit is many more, design for power supply unit will be difficult more, less and make the degree of difficulty height because of the demander of high-order security regulations in addition, and make that the cost of power supply unit also can be more and more high, so if the required power of computer system still continues to rise, system manufacturer will return selects the mode of lower-order security regulations demand to come design system, just is designed to less current limliting comparing unit or only needs the mode of one group of current limliting comparing unit to come design system; Now just be equiped with the power supply unit of current limliting comparing unit on the market, describe its connected mode and course of action in detail below in conjunction with accompanying drawing:
See also Fig. 1, it is the block schematic diagram that power supply unit of the prior art is equiped with single group current limliting comparing unit 31, as shown in the figure, include a power output circuit 10 that electric power is provided, power output circuit 10 produces a current limliting fiducial value Va with a constant current source 32 and a reference resistance 34, and be provided with surely position resistance 33 to produce a current limliting comparison value Vb at another sampling circuit, two inputs that this current limliting fiducial value Va and current limliting comparison value Vb are connected to a comparing unit 31 compare, use decision comparing unit 31 output normal state signals or error condition signal to power output circuit 10, if current limliting comparison value Vb is equal to or less than current limliting fiducial value Va, comparing unit 31 can be exported the power output circuit 10 of a signal of telecommunication (height) to power supply unit, make power supply unit enter closed condition, use the power supply of shutting down computer, otherwise if current limliting comparison value Vb is less than current limliting fiducial value Va, comparing unit 31 output, one signal of telecommunication (low) is to power supply unit, make the power supply unit regular event, allow the user can continue to use its computer system, be noted that the current limliting comparing unit 31 among this figure is that the current limliting comparison value Vb after the output power of all a plurality of loads 40 is summed up compares.
The power supply unit of another specification then as shown in Figure 2; adopt many group current limliting comparing units 31; and the sense mode of each single group current limliting comparing unit 31 all is same as shown in Figure 1; but; the design of the power supply unit of this specification all is based on the high-order design standard of maximum user's protection; therefore; as long as having wherein, one group of current limliting comparing unit 31 overloads; promptly can make power supply unit be closed condition; thereby computer cuts out to protect user's safety; but this kind practice then will limit the equipment disposition tolerance of its load 40 to the technical staff of familiar with computers.
Road from the above, the inner set current limliting comparing unit 31 of power supply unit on the market has two kinds now, a kind of is to give general computer user employed many group current limliting comparing units 31, another kind then is to give to meet the employed single group current limliting comparing unit 31 of computer technician, so power supply unit manufacturer now must be at the different users, the power supply unit of designing different size is to meet different users's demand, then not only compatible low and making degree of difficulty height, and more expend cost.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the defective that above-mentioned prior art exists, and a kind of power supply control circuit of selecting current-limiting mode function that possesses is provided.
For this reason; according to of the present invention possess select current-limiting mode function power supply control circuit by the following technical solutions: power supply unit has a power output circuit; and power output circuit provides many group electric power to drive a plurality of loads; and between power output circuit and load, dispose one and be used to drive the current limliting comparison circuit of the output power of load for normal or error condition in order to the decision power output circuit; the invention is characterized in; the current limliting comparison circuit is connected with one and selects circuit; and select circuit to provide the current limliting comparison circuit to be pattern one to one; the one-to-many pattern; the multi-to-multi pattern; or the many-one pattern, compare load is carried out be connected to the current limliting comparison circuit individually or in combination.
According to of the present invention possess the power supply control circuit of selecting current-limiting mode function can be when dispatching from the factory or the electric power output situation of looking the different loads combination at the different users, can switch at the single power supply supply and select current-limit mode, and need not make the power supply unit of multiple different size.
Description of drawings
Fig. 1 is the circuit diagram of single group current limliting comparing unit of the prior art;
Fig. 2 is the circuit diagram of many group current limliting comparing units of the prior art;
Fig. 3 is an overall circuit block schematic diagram of the present invention;
Fig. 4 is a detailed circuit block schematic diagram of the present invention;
Fig. 5 is the detailed circuit block schematic diagram of another embodiment of the present invention.
Embodiment
Relevant detailed description of the present invention and technology contents, existing accompanying drawings is as follows:
See also Fig. 3; shown in 4; as shown in the figure; the present invention is a kind of power supply control circuit of selecting current-limiting mode function that possesses; this power supply unit has a power output circuit 10; and power output circuit 10 provides many group electric power to drive a plurality of loads 40 (power output circuit 10 can be one-to-many pattern or multi-to-multi pattern output power); and between power output circuit 10 and load 40, dispose one and be used for driving the current limliting comparison circuit 30 of the output power of load 40 for normal or error condition in order to decision power output circuit 10; wherein; current limliting comparison circuit 30 is connected with one and selects circuit 20; and select circuit 20 to provide current limliting comparison circuit 30 to be pattern one to one; the multi-to-multi pattern; the one-to-many pattern; or the many-one pattern, thereby being carried out being connected to current limliting comparison circuit 30 individually or in combination, load 40 compares.
The power output circuit 10 of existing power supply supply and the design of current limliting comparison circuit 30 all have circuit difference, below describe with an embodiment.
Current limliting comparison circuit 30 of the present invention adopts the pressure drop mode to carry out logical operation relatively, mainly by being provided with a comparing unit 31 between current limliting comparison circuit 30 corresponding each output power and the load 40, be connected with a constant current source 32 and a reference resistance 34 to produce a current limliting fiducial value Va at an input of comparing unit 31, and connect the power input of power output circuit 10 and be provided with surely position resistance 33 to produce a current limliting comparison value Vb at another input, compare with current limliting comparison value Vb to determine comparing unit 31 output normal state signals or error condition signal with this current limliting fiducial value Va to power output circuit 10, select circuit 20 on the comparing unit 31 input circuits that produce current limliting fiducial value Va, to dispose first opening and closing element 21, and on the comparing unit 31 input circuits that produce current limliting comparison value Vb, dispose second opening and closing element 22, be connected with the 3rd opening and closing element 23 at the comparing unit 31 input circuits that produce current limliting comparison value Vb in addition, the 3rd opening and closing element 23 integral body are connected on the input circuit of at least one comparing unit 31, wherein, this comparing unit 31 is used to produce current limliting comparison value Vb, aforementioned first opening and closing element 21, second opening and closing element 22, or the 3rd opening and closing element 23 are switching circuits, provide four groups of output power to four loads 40 according to embodiments of the invention with single power supply output circuit 10 (also can be four groups of power output circuits 10), and four comparing units 31 of configuration between output power and load 40, and dispose four first opening and closing elements 21, second opening and closing element 22 and four the 3rd opening and closing elements 23 that are disposed at first group of power circuit, the 3rd opening and closing element 23 is integrated and is connected to the first group of power circuit that disposes second opening and closing element 22, can draw following state according to this embodiment:
First setting means; individual other four groups of current-limiting protection device: SA1; SA2; SA3; SA4; SB 1 is the ON state; SC1; SC2; SC3; SC4 is the OFF state; this moment is at the L1 of each load 40; L2; L3; L4 is other current-limiting protection; with 12V output voltage electric power is example; the maximum current flow of each load 40 then is defined as 20A; setting dangerous energy scale is peak power output 240VA; suppose that constant current source 32 is 100uA; reference resistance 34RA1; RA2; RA3; RA4 is 400 Ω; accurate position resistance 33RB1; RB2; RB3; RB4 then is 0.002 Ω; this moment, voltage drop value was 0.04V; also be that current limliting fiducial value Va is 11.96V; at this moment; if arbitrary load 40 equals or exceeds 20A because of situations such as abnormal operation cause the magnitude of current; be assumed to be 25A; then current limliting comparison value Vb is 11.95V with pressure drop; then comparing unit 31 is compared with current limliting fiducial value Va and the current limliting comparison value Vb that two inputs enter; because of current limliting fiducial value Va greater than current limliting comparison value Vb; so comparing unit 31 will be exported interrupt signal (height) to power supply unit; make power supply unit enter closed condition to stop power supply to load 40; this set condition is arbitrary load 40 all to be produced current limliting comparison value Vb and current limliting fiducial value Va individually compare to comparing unit 31; so as long as one of them load 40 has unusual condition to produce; power supply unit all can stop action, and the fail safe of user's best protection is provided to avoid dangerous energy to produce.
Second setting means; wherein three groups of total synthetic one group of current-limiting protections; another group is indivedual current-limiting protections: SA1; SA4; SC1; SC2; SC3 is the ON state; SA2; SA3; SB1; SC4 is the OFF state; under this setting means; the L1 of load 40; L2; L3 is sum total current-limiting protection; L4 then is single current-limiting protection; at this moment; L1; L2; L3 is the RB1 with three groups of accurate position resistance 33; RB2; RB3 calculates benchmark for the current limliting comparison value Vb of sum total electric current, and with the set point of first setting means, the current value of supposing LI is 25A; L2 is 18A; L3 is 12A, then calculates:
Current limliting comparison value Vb=12V-[(25A+18A+12A) * 0.002 Ω]/3=11.963V
Current limliting fiducial value Va=12V-(100uA*400 Ω)=11.96V
Learn by above-mentioned; though the L1 of single load 40 produces unusual overload condition; but because of this setting means is to adopt sum total current-limiting protection; so L1, L2, L3 must be when overall power output overload; or when the overload of the single group of L4 current limliting; power supply unit just can enter closed condition, also may be selected to be the current-limiting protection of 2 groups of sum totals and 2 groups of indivedual current-limiting protection modes according to this setting means.
The 3rd setting means; all sum total current-limiting protection: SA1, SC1, SC2, SC3, SC4 are the ON state; SA2, SA3, SA4, SB1 are the OFF state; the present invention also can be with all load 40 sum total current-limiting protections; its computation schema please refer to second setting means; according to this setting means; the user can ignore the situation that arbitrary load 40 issuable dangerous energy just cause power supply unit to be closed; but must be under the overload of sum total power output, power supply unit just can enter power down state.
The 4th setting means; wherein 2 groups of sum totals current-limiting protection; other 2 groups of sum totals current-limiting protection: see also shown in the 5th figure; except that above-mentioned setting means can be one to one current-limit mode and one-to-many current-limit mode; also can be multi-to-multi pattern or many-one pattern; suppose SA1; SA3; SC1; SC2; SC5; SC6 is the ON state; SA2; SA4; SB1; SB2; SC3; SC4 is the OFF state; this moment L1; the always synthetic one group of current-limiting protection of L2; and L3, the then always synthetic one group of current-limiting protection of L4 is under this setting means; L1 and L2 calculate at the sum total energy just to understand by comparing unit 31 output error status signals under the overload to power supply unit jointly; L3 and L4 also calculate jointly at the sum total energy just can be by comparing unit 31 output error status signals to power supply unit under the overload, and therefore, this setting means is to adopt the multi-to-multi pattern to carry out current-limiting protection.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All in the spirit and principles in the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. one kind possesses the power supply control circuit of selecting current-limiting mode function; described power supply unit has a power output circuit (10); and described power output circuit (10) provides a plurality of loads of driven by power (40) of many groups; and between described power output circuit (10) and described load (40), dispose one in order to the output power that determines described power output circuit (10) to be used to drive load (40) current limliting comparison circuit (30) for normal or error condition, it is characterized in that:
Described current limliting comparison circuit (30) is connected with one and selects circuit (20), and described selection circuit (20) provides described current limliting comparison circuit (30) to be pattern, one-to-many pattern, multi-to-multi pattern or many-one pattern one to one, so that being connected to described current limliting comparison circuit (30) individually or in combination, described load (40) compares
Be provided with a comparing unit (31) between corresponding each output power of described current limliting comparison circuit (30) and the load (40), be connected with a constant current source (32) and a reference resistance (34) to produce a current limliting fiducial value (Va) at an input of described comparing unit (31), and connect the power input of power output circuit (10) and be provided with surely position resistance (33) to produce a current limliting comparison value (Vb) at another input, compare with current limliting comparison value (Vb) determining described comparing unit (31) output normal state signal or error condition signal with this current limliting fiducial value (Va) to described power output circuit (10), and
Described selection circuit (20) is to dispose first opening and closing element (21) on comparing unit (31) the input circuit that produces current limliting fiducial value (Va), and on comparing unit (31) the input circuit that produces current limliting comparison value (Vb), dispose second opening and closing element (22), be connected with the 3rd opening and closing element (23) at comparing unit (31) the input circuit that produces current limliting comparison value (Vb) in addition, described the 3rd opening and closing element (23) is connected on the input circuit of at least one comparing unit (31).
2. the power supply control circuit that possesses the selection current-limiting mode function according to claim 1 is characterized in that, described current limliting comparison circuit (30) adopts the pressure drop mode to carry out logical operation.
3. the power supply control circuit that possesses the selection current-limiting mode function according to claim 1 is characterized in that described first, second and third opening and closing element (21,22,23) is a switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100988703A CN100446370C (en) | 2004-12-13 | 2004-12-13 | Power supply control circuit with selecting current-limiting mode function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100988703A CN100446370C (en) | 2004-12-13 | 2004-12-13 | Power supply control circuit with selecting current-limiting mode function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1790852A CN1790852A (en) | 2006-06-21 |
| CN100446370C true CN100446370C (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100988703A Expired - Fee Related CN100446370C (en) | 2004-12-13 | 2004-12-13 | Power supply control circuit with selecting current-limiting mode function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4514619A (en) * | 1982-09-30 | 1985-04-30 | The B. F. Goodrich Company | Indirect current monitoring via voltage and impedance monitoring |
| US5324989A (en) * | 1992-12-17 | 1994-06-28 | Thornton Roger D | Power controller module providing user selectable overload protection |
| CN1430804A (en) * | 2000-03-31 | 2003-07-16 | 微动公司 | Integrated current source feedback and current limiting element |
-
2004
- 2004-12-13 CN CNB2004100988703A patent/CN100446370C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4514619A (en) * | 1982-09-30 | 1985-04-30 | The B. F. Goodrich Company | Indirect current monitoring via voltage and impedance monitoring |
| US5324989A (en) * | 1992-12-17 | 1994-06-28 | Thornton Roger D | Power controller module providing user selectable overload protection |
| CN1430804A (en) * | 2000-03-31 | 2003-07-16 | 微动公司 | Integrated current source feedback and current limiting element |
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| Publication number | Publication date |
|---|---|
| CN1790852A (en) | 2006-06-21 |
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