CN202309061U - Circuit for shortening falling time of power supply output voltage - Google Patents
Circuit for shortening falling time of power supply output voltage Download PDFInfo
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- CN202309061U CN202309061U CN2011204253792U CN201120425379U CN202309061U CN 202309061 U CN202309061 U CN 202309061U CN 2011204253792 U CN2011204253792 U CN 2011204253792U CN 201120425379 U CN201120425379 U CN 201120425379U CN 202309061 U CN202309061 U CN 202309061U
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Abstract
The utility model relates to a circuit for shortening falling time of power supply output voltage. A power supply output circuit comprises an output transformer secondary coil, a rectifying diode and a power supply output filter branch composed of a power supply output resistor and a power supply output capacitor. The rectifying diode is connected between a positive end of the output transformer secondary coil and an output end of the power supply output filter branch, and a negative end of the output transformer secondary coil is connected with common of the power supply output filter branch. The circuit for shortening the falling time of the power supply output voltage is characterized in that a power supply state detecting circuit is arranged between the positive end of the secondary coil and the common. A virtual load discharging circuit with virtual load resistance far smaller than power supply output resistance is arranged between the output end of the power supply output filter branch and the common. The circuit for shortening the falling time of the power supply output voltage achieves fast discharging by arranging the virtual load discharging circuit, simultaneously meets requirements of shortening the falling time of the power supply output voltage and reducing standby power loss, guarantees matching between some electronic equipment and an application power supply, and effectively prevents misoperation of the electronic equipment from happening.
Description
Technical field
The utility model relates to power supply output, particularly relates to a kind of electric power output voltage circuit of fall time that shortens.
Background technology
As everyone knows, reduce the output dummy load power consumption of power supply, can reduce the power source integral loss.But; The existing output resistance resistance that adds the wonderful works dummy load is with the circuit of the output dummy load power consumption that reduces power supply; Because discharging through dummy load, output capacitance causes the slowly drawback of decline of output voltage when existing power supply under idle condition, to turn-off; Can not satisfy the requirement of some electronic equipment and applied power source coupling, output voltage descends slowly possibly cause the electronic equipment misoperation.Satisfy simultaneously at present that to shorten electric power output voltage fall time be a technical barrier with the requirement that reduces stand-by power consumption.
Summary of the invention
The utility model technical problem to be solved is the defective that remedies above-mentioned prior art, and a kind of electric power output voltage circuit of fall time that shortens is provided.
The technical problem of the utility model solves through following technical scheme.
The circuit of this shortening electric power output voltage fall time; Power output circuit comprises output transformer secondary coil, rectifier diode; And the power supply of forming by power supply output resistance and power supply output capacitance output filter branch; Said rectifier diode is connected the anode and the power supply of said output transformer secondary coil and exports between the output of filter branch, and the negative terminal of said output transformer secondary coil is connected with the common of power supply output filter branch.
The characteristics of the circuit of this shortening electric power output voltage fall time are:
Between the anode of the secondary coil of said transformer and public ground, be provided with a power state detection circuit, be used to detect the operating state of power supply.
Between between the output of said power supply output filter branch and the public ground, be provided with the dummy load discharge circuit of dummy load resistance much smaller than said power supply output resistance resistance.When said power state detection electric circuit inspection when power supply quits work, said dummy load discharge circuit is inserted power output circuit, the energy of said power supply output capacitance is mainly through the repid discharge of said dummy load discharge circuit; When said power state detection electric circuit inspection arrived the power supply operate as normal, said dummy load discharge circuit turn-offed, and can not increase the loss of power and stand-by power consumption.
The technical problem of the utility model solves through following further technical scheme.
Said power state detection circuit comprises the detection rectifier diode; And by detecting output resistance and detecting the detection output filter branch that output capacitance is formed; Said detection rectifier diode is connected the anode and the said detection of said output transformer secondary coil and exports between the output of filter branch; The negative terminal of said output transformer secondary coil is connected with the common of said detection output filter branch; The product of said detection output resistance and said detection output capacitance; Much smaller than the product of said power supply output resistance and said power supply output capacitance, and said detection output resistance resistance is 47K Ω～200K Ω, to reduce this power consumption in power supply of testing circuit.
Said dummy load discharge circuit comprises switching semiconductor pipe and the dummy load that is connected said switching semiconductor pipe major loop; The two ends of said switching semiconductor pipe major loop are connected with said dummy load with the output of said power supply output filter branch respectively, and the control utmost point of said switching semiconductor pipe is connected with the output of said detection output filter branch.
Said switching semiconductor pipe is a kind of in switch triode, combination switch triode and the metal oxide semiconductor field effect tube (Metal Oxide Semiconductor, initialism are MOS).
The beneficial effect of the utility model and prior art contrast is:
The utility model is realized repid discharge through the dummy load discharge circuit is set, and satisfies the requirement of shortening electric power output voltage fall time and reducing stand-by power consumption simultaneously, guarantees some electronic equipment and applied power source coupling, effectively avoids electronic equipment generation misoperation.
Description of drawings
Fig. 1 is the composition block diagram of the utility model;
Fig. 2 is the circuit diagram of the embodiment one of the utility model;
Fig. 3 is the circuit diagram of the embodiment two of the utility model;
Fig. 4 is the circuit diagram of the embodiment three of the utility model.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is described.
Embodiment one
A kind of like Fig. 1, the circuit of the shortening electric power output voltage fall time shown in 2; Power output circuit comprises output transformer secondary coil W2, rectifier diode D1; And the power supply of forming by power supply output resistance R1 and power supply output capacitance C1 output filter branch; Rectifier diode D1 is connected anode and the power supply of output transformer secondary coil W2 and exports between the output of filter branch, and the negative terminal of output transformer secondary coil W2 is connected with the common of power supply output filter branch.
Between the anode of the secondary coil W2 of transformer and public ground, be provided with a power state detection circuit U 1, be used to detect the operating state of power supply.
Power state detection circuit U 1 comprises detection rectifier diode D2; And by detecting output resistance R2 and detecting the detection output filter branch that output capacitance C2 forms; Detection rectifier diode D2 is connected the anode of output transformer secondary coil W2 and detects between the output of output filter branch, and the negative terminal of output transformer secondary coil W2 is connected with the common that detects the output filter branch, detection output resistance R2 and the product that detects output capacitance C2; Product much smaller than power supply output resistance R1 and power supply output capacitance C1; And detecting output resistance R2 is 100K Ω, and to reduce this power consumption in power supply of testing circuit, detecting output capacitance C2 is 1 μ F; Power supply output resistance R1 is 47K Ω, and power supply output capacitance C1 is 560 μ F.
Between between the output of power supply output filter branch and the public ground, be provided with the dummy load discharge circuit U2 of dummy load resistance much smaller than power supply output resistance resistance.
Dummy load discharge circuit U2 comprises switch triode Q1 and the dummy load R3 that is connected switch triode Q1 major loop; The two ends of switch triode Q1 major loop are connected with dummy load R3 with the output of power supply output filter branch respectively, and the control utmost point of switch triode Q1 is connected with the output that detects the output filter branch.Dummy load R3 is 270 Ω, and resistance is much smaller than power supply output resistance R1 resistance.
When power state detection circuit U 1 detects power supply and quits work; Switch triode Q1 base potential descends through detection output resistance R2, detection output capacitance C2 fast; And switch triode Q1 emitter current potential descends at a slow speed through power supply output resistance R1, power supply output capacitance C1; When switch triode Q1 base-emitter voltage Vbe reaches the unlatching value, switch triode Q1 conducting, dummy load discharge circuit U2 is inserted power output circuit; Mainly through the dummy load R3 repid discharge among the dummy load discharge circuit U2, output voltage V o's energy of power supply output capacitance C1 fast descends; When power state detection circuit U 1 detects the power supply operate as normal; When switch triode Q1 base-emitter voltage Vbe does not reach the unlatching value; Switch triode Q1 turn-offs; Dummy load discharge circuit U2 turn-offs, and dummy load R3 is turned off and is not connected with power output end, can not increase the loss of power and stand-by power consumption.
Embodiment two
A kind of like Fig. 1, the circuit of the shortening electric power output voltage fall time shown in 3, with embodiment one, difference is basically:
Switch triode Q1 is substituted by combination switch triode Q2, Q3, and the connection of dummy load resistance R3 changes sees Fig. 3.
Embodiment three
A kind of like Fig. 1, the circuit of the shortening electric power output voltage fall time shown in 4, with embodiment one, difference is basically:
Switch triode Q1 is substituted by metal-oxide-semiconductor M1.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.Those of ordinary skill for technical field under the utility model; Under the prerequisite that does not break away from the utility model design, make some alternative or obvious modification that are equal to; And performance or purposes are identical, all should be regarded as belonging to the scope of patent protection that the utility model is confirmed by claims of being submitted to.
Claims (4)
1. one kind is shortened the electric power output voltage circuit of fall time; Power output circuit comprises output transformer secondary coil, rectifier diode; And the power supply of forming by power supply output resistance and power supply output capacitance output filter branch; Said rectifier diode is connected the anode and the power supply of said output transformer secondary coil and exports between the output of filter branch, and the negative terminal of said output transformer secondary coil is connected with the common of power supply output filter branch, it is characterized in that:
Between the anode of the secondary coil of said transformer and public ground, be provided with a power state detection circuit; Between between the output of said power supply output filter branch and the public ground, be provided with the dummy load discharge circuit of dummy load resistance much smaller than said power supply output resistance resistance.
2. the circuit of shortening electric power output voltage as claimed in claim 1 fall time is characterized in that:
Said power state detection circuit comprises the detection rectifier diode; And by detecting output resistance and detecting the detection output filter branch that output capacitance is formed; Said detection rectifier diode is connected the anode and the said detection of said output transformer secondary coil and exports between the output of filter branch; The negative terminal of said output transformer secondary coil is connected with the common of said detection output filter branch; The product of said detection output resistance and said detection output capacitance, much smaller than the product of said power supply output resistance and said power supply output capacitance, and said detection output resistance resistance is 47K Ω～200K Ω.
3. according to claim 1 or claim 2 the circuit of shortening electric power output voltage fall time is characterized in that:
Said dummy load discharge circuit comprises switching semiconductor pipe and the dummy load that is connected said switching semiconductor pipe major loop; The two ends of said switching semiconductor pipe major loop are connected with said dummy load with the output of said power supply output filter branch respectively, and the control utmost point of said switching semiconductor pipe is connected with the output of said detection output filter branch.
4. the circuit of shortening electric power output voltage as claimed in claim 3 fall time is characterized in that:
Said switching semiconductor pipe is a kind of among switch triode, combination switch triode and the metal oxide semiconductor field effect tube MOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253792U CN202309061U (en) | 2011-11-01 | 2011-11-01 | Circuit for shortening falling time of power supply output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253792U CN202309061U (en) | 2011-11-01 | 2011-11-01 | Circuit for shortening falling time of power supply output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202309061U true CN202309061U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204253792U Expired - Fee Related CN202309061U (en) | 2011-11-01 | 2011-11-01 | Circuit for shortening falling time of power supply output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202309061U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529905A (en) * | 2015-11-26 | 2016-04-27 | 艾德克斯电子（南京）有限公司 | DC power supply with rapid power releasing function and power releasing equipment thereof |
| CN105981276A (en) * | 2014-02-06 | 2016-09-28 | 戴乐格半导体公司 | Power converter with fast discharge circuit |
| CN108736698A (en) * | 2017-04-13 | 2018-11-02 | 台达电子工业股份有限公司 | Power supply unit and residual voltage charging method |
-
2011
- 2011-11-01 CN CN2011204253792U patent/CN202309061U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105981276A (en) * | 2014-02-06 | 2016-09-28 | 戴乐格半导体公司 | Power converter with fast discharge circuit |
| CN105529905A (en) * | 2015-11-26 | 2016-04-27 | 艾德克斯电子（南京）有限公司 | DC power supply with rapid power releasing function and power releasing equipment thereof |
| CN108736698A (en) * | 2017-04-13 | 2018-11-02 | 台达电子工业股份有限公司 | Power supply unit and residual voltage charging method |
| US10720855B2 (en) | 2017-04-13 | 2020-07-21 | Delta Electronics, Inc. | Power supply and residual voltage discharging method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20201101 |