CN202602274U - Load discharge circuit suitable for power supply system - Google Patents
Load discharge circuit suitable for power supply system Download PDFInfo
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- CN202602274U CN202602274U CN 201220209261 CN201220209261U CN202602274U CN 202602274 U CN202602274 U CN 202602274U CN 201220209261 CN201220209261 CN 201220209261 CN 201220209261 U CN201220209261 U CN 201220209261U CN 202602274 U CN202602274 U CN 202602274U
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Abstract
The utility model discloses a load discharge circuit suitable for a power supply system. The load discharge circuit is in parallel connection with a filtering capacitor at an output terminal of the power supply system. The circuit comprises three NPN triodes, an optoelectronic coupler, two capacitors and five resistors. In the discharge circuit, a collector electrode of a third NPN triode is connected with a power supply output anode through a discharge resistor. An emitter electrode of the third NPN triode is connected with the ground. A base electrode of a first NPN triode is used for receiving startup and shutdown signals, and bias current of a base electrode of the third NPN triode is controlled through the first NPN triode, the optoelectronic coupler and a second NPN triode, thereby discharging the filtering capacitor when the power supply is cut off.
Description
Technical field
The utility model relates to a kind of load discharge circuit, in particular, relates to a kind ofly to after the power-supply system shutdown, prevents that output voltage from descending slowly and output loading is produced the load discharge circuit of potential hazard.
Background technology
Power supply is the energy supply system of electronic equipment.After civil power gets into power supply; After choking-winding and capacitor filtering removal high frequency clutter and interference signal; Obtain high voltage direct current through over commutation and filtering; Switching circuit changes into the dither direct current to high voltage direct current, obtains pure direct current through rectification, filter circuit after sending the high frequency switch transformer conversion then.
Therefore, the filter circuit of being made up of inductance and electric capacity is a requisite part in the power-supply system.When the power-supply system operate as normal, the output filter capacitor storage power; When system closedown, storage capacitor releases energy, if there is not discharge circuit, output voltage descends slowly, and output loading is still in running order at short notice, will produce potential harm to system.If output voltage is very high, output loading is very light, after the shutdown Danger Electric shock risk will be arranged.General using resistance directly discharges to electric capacity, resistance value hour, shutdown back capacitor discharge is very fast, but when the power supply operate as normal, can produce bigger power consumption; When resistance value was big, shutdown back capacitor discharge time was long, can't reach the discharge effect of expection.
In view of above analysis, this paper has proposed a kind of load automatic discharge circuit, can regulate discharge time, and only in power supply shutdown back work, has avoided when the power supply operate as normal, producing the problem than lossy.
Summary of the invention
In order to solve power-supply system shutdown back output storage capacitor long problem discharge time, the utility model proposes a kind of load discharge circuit.The load discharge circuit of the utility model is parallelly connected with the power output end filter capacitor, through receive isolating the off signal of input, discharges the energy in the storage capacitor, reaches the level load of protection back, prevents the purpose of getting an electric shock.
A kind of load discharge circuit that is applicable to power-supply system of the utility model, said load discharge circuit is arranged on power module and load blocks, and said load discharge circuit includes energy storage filtration module (1), discharge module (2) and discharge control module (3);
Power module is out-put supply cut-off signals V on the one hand
In1Give discharge control module (3); Output ripple direct current signal V on the other hand
In2Give energy storage filtration module (1);
The pulsating direct current signal V of energy storage filtration module (1) to receiving
In2After carrying out the dc energy storage Filtering Processing, output direct-current discharge enabling signal V
1Give discharge module (2);
Discharge control module (3) is according to power remove signal V
In1Open or turn-off discharge module (2), thus output triggering signal V
3Give discharge module (2);
Discharge module (2) is according to triggering signal V
3To the direct-current discharge enabling signal V that receives
1Discharge, thus output loading cut-off signals V
2Give load blocks.
The utility model solves the scheme that its technical problem adopted: construct a kind of discharge circuit, circuit is energy storage filtering first capacitor C 1 of a power module output foremost; Discharge control loop includes a NPN type triode Q1, photoelectrical coupler N1, the 2nd NPN type triode Q2, second capacitor C 2; The discharge major loop includes the 3rd NPN type triode Q3 and discharge resistance R5.Energy storage filtering i.e. first capacitor C 1 is connected on power-supply system output just and between the ground.This photoelectrical coupler N1 has a primitive plane and a secondary side; The primitive plane input is connected with an external voltage through resistance R 5; The primitive plane output is connected with the collector electrode of a NPN type triode Q1; The grounded emitter of the one NPN type triode Q1, the base stage of a NPN type triode Q1 is the low level off signal; The input of photoelectrical coupler N1 secondary side links to each other with the power supply output cathode through resistance; The secondary side output links to each other with the 2nd NPN type transistor base; The 2nd NPN type triode Q2 base stage links to each other with ground through resistance, the grounded emitter of the 2nd NPN type triode Q2, and the collector electrode of the 2nd NPN type triode Q2 passes through resistance and links to each other with the power supply output cathode; Link to each other with ground through second electric capacity, the collector electrode of the 2nd NPN type triode Q2 links to each other with the base stage of the 3rd NPN type triode Q3; The collector electrode of the 3rd NPN type triode Q3 links to each other the grounded emitter of the 3rd NPN type triode Q3 through discharge resistance R5 with the power supply output cathode.
The utility model is applicable to that the advantage of the load discharge circuit of power-supply system is:
1. the action of adopting the discharge control module to control discharge module realizes the rapid shutdown of load blocks, reaches the purpose of protection load blocks.
2. utilize discharge module that the energy storage filtration module is discharged, reach the purpose that prevents the human electric shock.
3. through regulating the discharge time that resistance R 4 and capacitor C 2 can be regulated discharge module.
4. in existing power supply module, set up the load discharge circuit of the utility model, the energy of electric consumption module is very little, and the efficient of power module is not impacted.
5. the load discharge circuit of the utility model design, components and parts use few, and reliability is high, and cost is low, applied range.
Description of drawings
Fig. 1 is the structural representation of the utility model load discharge circuit.
Fig. 2 is the circuit theory diagrams of the utility model load discharge circuit.
Embodiment
To combine accompanying drawing that the utility model is done further detailed description below.
Referring to shown in Figure 1; A kind of load discharge circuit that is applicable to power-supply system of the utility model; Said load discharge circuit is arranged on power module and load blocks, and said load discharge circuit includes energy storage filtration module 1, discharge module 2 and discharge control module 3;
Power module is out-put supply cut-off signals V on the one hand
In1Give discharge control module 3; Output ripple direct current signal V on the other hand
In2Give energy storage filtration module 1;
The pulsating direct current signal V of 1 pair of reception of energy storage filtration module
In2After carrying out the dc energy storage Filtering Processing, output direct-current discharge enabling signal V
1Give discharge module 2;
In the utility model, make the 1 rapid discharge of energy storage filtration module protect load blocks thereby utilize the load off signal to trigger discharge module 2.
Referring to shown in Figure 2, the connection of each electronic devices and components of the load discharge circuit of the utility model is:
The positive terminal of power module connects with the positive terminal of load blocks, and the negative pole end of power module connects with the negative pole end of load blocks;
Be connected with 1 end of first capacitor C 1,1 end of second resistance R 2,1 end of the 4th resistance R 4,1 end of the 5th resistance R 5 between the positive terminal of the positive terminal of power module to load blocks in order;
Be connected with 2 ends of first capacitor C 1,2 ends of the 3rd resistance R 3,2 ends of second capacitor C 2 between the negative pole end of the negative pole end of power module to load blocks in order;
1 end of photoelectrical coupler N1 connects with 2 ends of second resistance R 2; 2 ends of photoelectrical coupler N1 connect with 1 end of the 3rd resistance R 3 and the base stage of the 2nd NPN type triode Q2; 3 ends of photoelectrical coupler N1 connect with 2 ends of first resistance R 1, and 4 ends of photoelectrical coupler N1 connect with the collector electrode of a NPN type triode Q1;
The base stage of the one NPN type triode Q1 connects starting-up signal, and the collector electrode of a NPN type triode Q1 connects with 4 ends of photoelectrical coupler N1, the grounded emitter of a NPN type triode Q1;
The base stage of the 2nd NPN type triode Q2 connects with 2 ends of photoelectrical coupler N1, and the collector electrode of the 2nd NPN type triode Q2 connects the grounded emitter of the 2nd NPN type triode Q2 with the base stage of 2 ends of the 4th resistance R 4 and the 3rd NPN type triode Q3;
The base stage of the 3rd NPN type triode Q3 connects with the collector electrode of the 2nd NPN type triode Q2 and 1 end of second capacitor C 2, and the collector electrode of the 3rd NPN type triode Q3 connects with 2 ends of the 5th resistance R 5, the grounded emitter of the 3rd NPN type triode Q3;
1 end of first resistance R 1 connects with external voltage VDD, and 2 ends of first resistance R 1 connect with 3 ends of photoelectrical coupler N1;
1 end of second resistance R 2 connects with the positive terminal of power module, and 2 ends of second resistance R 2 connect with 1 end of photoelectrical coupler N1;
1 end of the 3rd resistance R 3 connects with the base stage of 2 ends of photoelectrical coupler N1 and the 2nd NPN type triode Q2, and 2 ends of the 3rd resistance R 3 connect with the negative pole end of power module;
1 end of the 4th resistance R 4 connects with the positive terminal of power module, and 2 ends of the 4th resistance R 4 connect with the collector electrode of the 2nd NPN type triode Q2 and the base stage of the 3rd NPN type triode Q3;
1 end of the 5th resistance R 5 connects with the positive terminal of power module, and 2 ends of the 5th resistance R 5 connect with the collector electrode of the 3rd NPN type triode Q3;
1 end of first capacitor C 1 connects with the positive terminal of power module, and 2 ends of first capacitor C 1 connect with the negative pole end of power module;
1 end of second capacitor C 2 connects with the base stage of the 3rd NPN type triode Q3, and 2 ends of second capacitor C 2 connect with the negative pole end of power module.
In circuit structure shown in Figure 2, first capacitor C 1 has constituted energy storage filtration module 1; The one NPN type triode Q1, photoelectrical coupler N1, the 2nd NPN type triode Q2, second capacitor C 2 have constituted discharge control module 3; The 3rd NPN type triode Q3 and discharge resistance R5 have constituted discharge module 2.
In the utility model; Photoelectrical coupler N1 has a primitive plane (3 ends, 4 ends) and a secondary side (1 end, 2 ends); The primitive plane input is connected with an external voltage VDD through first resistance R 1, and the primitive plane output is connected with the collector electrode of second resistance R 2 with a NPN type triode Q1 respectively.
When power module was in operate as normal, the power module output voltage VO was normal, and external voltage VDD is normal.First capacitor C, 1 store electrical energy; The one NPN type triode Q1 base stage receives the starting-up signal of high level, a NPN type triode Q1 conducting, photoelectrical coupler N1 conducting; Output voltage VO provides bias current through secondary the 2nd NPN type triode Q2 that gives of first resistance R 1 and photoelectrical coupler N1; Then the 2nd NPN type triode Q2 conducting makes the base voltage of the 3rd NPN type triode Q3 level off to zero, and then the 3rd NPN type triode Q3 ends; The 5th resistance R 5 no currents flow through, and discharge circuit (being discharge module 2) consumed power is very little.
When power module was in shutdown, before first capacitor C 1 released energy, output voltage VO was normal.The one NPN type triode Q1 base stage receives low level off signal; Then a NPN type triode Q1 ends, and photoelectrical coupler N2 ends, and the 2nd NPN type triode Q2 base stage does not have bias current; The 2nd NPN type triode Q2 ends; Output voltage VO is that the 3rd NPN type triode Q3 base stage provides bias current through the 5th resistance R 5, and the 3rd NPN type triode Q3 conducting is released the energy that is stored in 1 li of first capacitor C; Output voltage VO descends rapidly, reaches the purpose of discharge circuit (being discharge module 2) discharge.Discharge resistance R5 (i.e. the 5th resistance R 5) size of resistance can determine the length of discharge time, and discharge resistance R5 resistance is more little, and discharge time is fast more; Otherwise discharge resistance R5 resistance is big more, and discharge time is slow more.When output voltage VO is low to moderate can not be the 3rd NPN type triode Q3 when enough base current is provided through the 4th resistance R 4, and the 3rd NPN type triode Q3 ends, and discharge circuit quits work, and first capacitor C, 1 energy remaining will discharge through output loading.Second capacitor C 2 can delay discharge circuit operate time, prevents the moment of starting shooting, because the time-delay of starting-up signal and guiding discharge circuit erroneous action.
Claims (4)
1. load discharge circuit that is applicable to power-supply system, said load discharge circuit is arranged on power module and load blocks, it is characterized in that: this load discharge circuit includes energy storage filtration module (1), discharge module (2) and discharge control module (3);
Power module is out-put supply cut-off signals V on the one hand
In1Give discharge control module (3); Output ripple direct current signal V on the other hand
In2Give energy storage filtration module (1);
The pulsating direct current signal V of energy storage filtration module (1) to receiving
In2After carrying out the dc energy storage Filtering Processing, output direct-current discharge enabling signal V
1Give discharge module (2);
Discharge control module (3) is according to power remove signal V
In1Open or turn-off discharge module (2), thus output triggering signal V
3Give discharge module (2);
Discharge module (2) is according to triggering signal V
3To the direct-current discharge enabling signal V that receives
1Discharge, thus output loading cut-off signals V
2Give load blocks.
2. the load discharge circuit that is applicable to power-supply system according to claim 1 is characterized in that the connection of each electronic devices and components of said load discharge circuit is:
The positive terminal of power module connects with the positive terminal of load blocks, and the negative pole end of power module connects with the negative pole end of load blocks;
Be connected with 1 end of first capacitor C 1,1 end of second resistance R 2,1 end of the 4th resistance R 4,1 end of the 5th resistance R 5 between the positive terminal of the positive terminal of power module to load blocks in order;
Be connected with 2 ends of first capacitor C 1,2 ends of the 3rd resistance R 3,2 ends of second capacitor C 2 between the negative pole end of the negative pole end of power module to load blocks in order;
1 end of photoelectrical coupler N1 connects with 2 ends of second resistance R 2; 2 ends of photoelectrical coupler N1 connect with 1 end of the 3rd resistance R 3 and the base stage of the 2nd NPN type triode Q2; 3 ends of photoelectrical coupler N1 connect with 2 ends of first resistance R 1, and 4 ends of photoelectrical coupler N1 connect with the collector electrode of a NPN type triode Q1;
The base stage of the one NPN type triode Q1 connects starting-up signal, and the collector electrode of a NPN type triode Q1 connects with 4 ends of photoelectrical coupler N1, the grounded emitter of a NPN type triode Q1;
The base stage of the 2nd NPN type triode Q2 connects with 2 ends of photoelectrical coupler N1, and the collector electrode of the 2nd NPN type triode Q2 connects the grounded emitter of the 2nd NPN type triode Q2 with the base stage of 2 ends of the 4th resistance R 4 and the 3rd NPN type triode Q3;
The base stage of the 3rd NPN type triode Q3 connects with the collector electrode of the 2nd NPN type triode Q2 and 1 end of second capacitor C 2, and the collector electrode of the 3rd NPN type triode Q3 connects with 2 ends of the 5th resistance R 5, the grounded emitter of the 3rd NPN type triode Q3;
1 end of first resistance R 1 connects with external voltage VDD, and 2 ends of first resistance R 1 connect with 3 ends of photoelectrical coupler N1;
1 end of second resistance R 2 connects with the positive terminal of power module, and 2 ends of second resistance R 2 connect with 1 end of photoelectrical coupler N1;
1 end of the 3rd resistance R 3 connects with the base stage of 2 ends of photoelectrical coupler N1 and the 2nd NPN type triode Q2, and 2 ends of the 3rd resistance R 3 connect with the negative pole end of power module;
1 end of the 4th resistance R 4 connects with the positive terminal of power module, and 2 ends of the 4th resistance R 4 connect with the collector electrode of the 2nd NPN type triode Q2 and the base stage of the 3rd NPN type triode Q3;
1 end of the 5th resistance R 5 connects with the positive terminal of power module, and 2 ends of the 5th resistance R 5 connect with the collector electrode of the 3rd NPN type triode Q3;
1 end of first capacitor C 1 connects with the positive terminal of power module, and 2 ends of first capacitor C 1 connect with the negative pole end of power module;
1 end of second capacitor C 2 connects with the base stage of the 3rd NPN type triode Q3, and 2 ends of second capacitor C 2 connect with the negative pole end of power module.
3. the load discharge circuit that is applicable to power-supply system according to claim 2 is characterized in that: first capacitor C 1 has constituted energy storage filtration module (1); The one NPN type triode Q1, photoelectrical coupler N1, the 2nd NPN type triode Q2, second capacitor C 2 have constituted discharge control module (3); The 3rd NPN type triode Q3 and discharge resistance R5 have constituted discharge module (2).
4. the load discharge circuit that is applicable to power-supply system according to claim 2; It is characterized in that: during the power module shutdown; The one NPN type triode Q1, photoelectrical coupler N1, the 2nd NPN type triode Q2 all end, the 3rd NPN type triode Q3 conducting, and discharge circuit is started working.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220209261 CN202602274U (en) | 2012-05-08 | 2012-05-08 | Load discharge circuit suitable for power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220209261 CN202602274U (en) | 2012-05-08 | 2012-05-08 | Load discharge circuit suitable for power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102982781A (en) * | 2012-12-29 | 2013-03-20 | 深圳市华星光电技术有限公司 | Drive circuit and drive method for liquid crystal display device and liquid crystal display device |
| US9230493B2 (en) | 2012-12-29 | 2016-01-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD device driver circuit, driving method, and LCD device |
| CN106357101A (en) * | 2016-09-29 | 2017-01-25 | 江苏金坛绿能新能源科技有限公司 | Active discharge circuit for filter capacitor of electric automobile controller |
| CN106655114A (en) * | 2017-02-13 | 2017-05-10 | 上海鼎充新能源技术有限公司 | High-voltage direct-current energy leakage control circuit with control and feedback functions |
| CN107395005A (en) * | 2017-08-30 | 2017-11-24 | 固安华电天仁控制设备有限公司 | A kind of Switching Power Supply filter capacitor quick discharging circuit |
| WO2017219737A1 (en) * | 2016-06-21 | 2017-12-28 | 深圳市九洲电器有限公司 | Discharge circuit and discharge method for set-top box during poweroff |
| CN108322239A (en) * | 2018-01-26 | 2018-07-24 | 苏州力生美半导体有限公司 | A kind of short distance is unidirectionally powered the circuit structure of reverse link communication |
| CN108462386A (en) * | 2017-12-28 | 2018-08-28 | 武汉合康动力技术有限公司 | Digital quantity controls analog switch the control circuit of chip in a kind of power-supply system |
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| CN108322239B (en) * | 2018-01-26 | 2024-04-16 | 苏州力生美半导体有限公司 | Close-range unidirectional power supply reverse communication circuit structure |
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- 2012-05-08 CN CN 201220209261 patent/CN202602274U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102982781A (en) * | 2012-12-29 | 2013-03-20 | 深圳市华星光电技术有限公司 | Drive circuit and drive method for liquid crystal display device and liquid crystal display device |
| US9230493B2 (en) | 2012-12-29 | 2016-01-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD device driver circuit, driving method, and LCD device |
| WO2017219737A1 (en) * | 2016-06-21 | 2017-12-28 | 深圳市九洲电器有限公司 | Discharge circuit and discharge method for set-top box during poweroff |
| CN106357101A (en) * | 2016-09-29 | 2017-01-25 | 江苏金坛绿能新能源科技有限公司 | Active discharge circuit for filter capacitor of electric automobile controller |
| CN106655114A (en) * | 2017-02-13 | 2017-05-10 | 上海鼎充新能源技术有限公司 | High-voltage direct-current energy leakage control circuit with control and feedback functions |
| CN107395005A (en) * | 2017-08-30 | 2017-11-24 | 固安华电天仁控制设备有限公司 | A kind of Switching Power Supply filter capacitor quick discharging circuit |
| CN107395005B (en) * | 2017-08-30 | 2021-04-13 | 国能信控互联技术(河北)有限公司 | Switching power supply filter capacitor quick discharge circuit |
| CN108462386A (en) * | 2017-12-28 | 2018-08-28 | 武汉合康动力技术有限公司 | Digital quantity controls analog switch the control circuit of chip in a kind of power-supply system |
| CN108322239A (en) * | 2018-01-26 | 2018-07-24 | 苏州力生美半导体有限公司 | A kind of short distance is unidirectionally powered the circuit structure of reverse link communication |
| CN108322239B (en) * | 2018-01-26 | 2024-04-16 | 苏州力生美半导体有限公司 | Close-range unidirectional power supply reverse communication circuit structure |
| CN111174390A (en) * | 2020-02-17 | 2020-05-19 | 珠海格力电器股份有限公司 | Power taking circuit, wire controller, air conditioner and resistance control method |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Yihongtai Technology Development Co., Ltd. Document name: Notification to Pay the Fees |
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Addressee: Beijing Yihongtai Technology Development Co., Ltd. Document name: Notification of Termination of Patent Right |
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| 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: 20121212 Termination date: 20160508 |