CN203911743U - Electronic device and capacitor discharge circuit thereof - Google Patents
Electronic device and capacitor discharge circuit thereof Download PDFInfo
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- CN203911743U CN203911743U CN201420226034.8U CN201420226034U CN203911743U CN 203911743 U CN203911743 U CN 203911743U CN 201420226034 U CN201420226034 U CN 201420226034U CN 203911743 U CN203911743 U CN 203911743U
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- electronic equipment
- discharge switch
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- 239000003990 capacitor Substances 0.000 title claims abstract description 73
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model belongs to the technical field of electronics, and provides an electronic device and a capacitor discharge circuit thereof. The electronic device adopts the capacitor discharge circuit including a discharge element and a discharge switch, and the circuit structure is simple and the cost is low. The discharge circuit is formed by the discharge element, the discharge switch, and a filtering capacitor. When the electronic device is powered, the discharge switch breaks the discharge circuit according to a control voltage output by a master control circuit, so that the normal operation of other circuits in the electronic device is not influenced. When the power of the electronic device is off, the discharge switch connects the discharge circuit because of non-reception of the control voltage output by the material control circuit so as to discharge the filtering capacitor, so that the low cost of the circuit is maintained, and the filtering capacitor can be discharged during power interruption of the electronic device. The problems in the prior that the low cost of the circuit cannot be ensured while the effects that the normal operation of other circuits are not influenced when the power is on, and the capacitor can be discharged when the power is off are achieved.
Description
Technical field
The utility model belongs to electronic technology field, relates in particular to a kind of electronic equipment and capacitor discharging circuit thereof.
Background technology
At present, along with the fast development of electronic technology, electronic equipment is applied in daily life more and more.Electronic equipment be unable to do without electric energy, alternating current need to be carried out to rectifying and wave-filtering and take that to obtain direct current that waveform is level and smooth be electronic equipment power supply, wherein, electric capacity is used as filtering device conventionally for the direct current of exporting after over commutation is processed is carried out to ripple filtering processing, to obtain the direct current that waveform is level and smooth.In addition, electric capacity also has the function of electrical power storage, if electronic equipment is power-off in running, in electric capacity stored electric energy in the situation that not having path to discharge or release way is not right, can cause damage to other components and parts, especially, for the higher electric capacity of capacity, the electric energy of its storage is also more, if electric energy cannot discharge or discharge and make mistakes, entail dangers to user's personal safety even.
For above-mentioned electric capacity in existing problem aspect electric energy release, a kind of technical scheme that prior art provides is by being connected in parallel on the resistance formation discharge circuit at electric capacity two ends, electric capacity to be discharged, but its defect is: resistance is also always in running order when circuit is normally worked, this will affect to the normal work of circuit, also can affect the life-span of discharge circuit simultaneously.In order to solve the existing problem of technique scheme, prior art also provides another kind of technical scheme, by comparatively complicated power failure detection circuit, to power supply, input detects for it, when power cut-off being detected, controlling discharge circuit discharges to electric capacity, yet the needed circuit structure of this scheme is comparatively complicated, has virtually increased circuit cost.
In sum, prior art exists cannot both guarantee that circuit cost was low, can when power supply is switched on, not affect again the normal work of other circuit, and electric capacity was realized the problem of electric discharge when power cut-off.
Utility model content
The purpose of this utility model is to provide a kind of capacitor discharging circuit, be intended to solve that prior art is existing cannot both guarantee that circuit cost was low, can when power supply is switched on, not affect the normal work of other circuit again, and electric capacity is realized the problem of electric discharge when power cut-off.
The utility model is to realize like this, a kind of capacitor discharging circuit, be connected with rectifier bridge, filter capacitor, governor circuit, switching power circuit and load in electronic equipment, described rectifier bridge and described filter capacitor carry out alternating current to export direct current to described load and described switching power circuit after rectifying and wave-filtering, described switching power circuit provides light current voltage according to described direct current for described governor circuit and described load, and described governor circuit is controlled described loaded work piece; When power supply when energising of described electronic equipment, described governor circuit output is controlled voltage to described capacitor discharging circuit, and when the power cut-off of described electronic equipment, described governor circuit stops exporting described control voltage;
Described capacitor discharging circuit comprises discharge device and discharge switch, the input of described discharge device connects the positive pole of described filter capacitor, the output of described discharge device connects the input of described discharge switch, the output of described discharge switch and the negative pole of described filter capacitor are connected to ground altogether, described discharge device and described discharge switch and described filter capacitor form discharge loop, the controlled end of described discharge switch receives the control voltage of described governor circuit output, when the power supply of described electronic equipment is switched on, described discharge switch disconnects described discharge loop according to described control voltage, when the power cut-off of described electronic equipment, described discharge switch is not opened described discharge loop because receiving described control voltage, so that described filter capacitor is discharged.
Another object of the present utility model is also to provide a kind of electronic equipment, and it comprises rectifier bridge, filter capacitor, governor circuit, switching power circuit and load, and in addition, described electronic equipment also comprises above-mentioned capacitor discharging circuit.
The utility model by adopting the capacitor discharging circuit that comprises discharge device and discharge switch in electronic equipment, and its circuit structure is simple and cost is low; By discharge device and discharge switch and filter capacitor, form discharge loop, when the power supply energising of electronic equipment, discharge switch disconnects discharge loop according to the control voltage of governor circuit output, to avoid affecting the normal work of other circuit in electronic equipment; When the power cut-off of electronic equipment, discharge switch is not opened discharge loop because receiving the control voltage of governor circuit output, so that filter capacitor is discharged, thereby can guarantee that circuit cost is low, can when electronic equipment power-off, to filter capacitor, realize electric discharge again, solved that prior art is existing cannot both guarantee that circuit cost was low, can when power supply is switched on, not affect again the normal work of other circuit, and electric capacity has been realized the problem of electric discharge when power cut-off.
Accompanying drawing explanation
Fig. 1 is the structure chart of the capacitor discharging circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit structure chart of the capacitor discharging circuit shown in Fig. 1;
Fig. 3 is the structure chart of the capacitor discharging circuit that provides of another embodiment of the utility model;
Fig. 4 is the exemplary circuit structure chart of the capacitor discharging circuit shown in Fig. 3.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the structure of the capacitor discharging circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
The capacitor discharging circuit 100 that the utility model embodiment provides is connected with the rectifier bridge BD in electronic equipment, filter capacitor E, governor circuit 200, switching power circuit 300 and load 400, rectifier bridge BD and filter capacitor E carry out alternating current to export direct current to load 400 and switching power circuit 300 after rectifying and wave-filtering, switching power circuit 300 provides light current voltage, governor circuit 200 control loads 400 work according to described direct current for governor circuit 200 and load 400; When the power supply of electronic equipment is switched on, voltage V are controlled in governor circuit 200 outputs
cTRto capacitor discharging circuit 100, when the power cut-off of electronic equipment, governor circuit 200 stops output and controls voltage V
cTR.Wherein, the first input end 1 of rectifier bridge BD and the second input 2 are respectively by live wire L and zero line N incoming transport electricity, the output 3 of rectifier bridge BD connects (in Fig. 1, being labeled as P) altogether with the positive pole of filter capacitor E, and the input of while connecting valve power circuit 300 and the input of load 400, the earth terminal 4 of rectifier bridge BD and the negative pole of filter capacitor E be connected to altogether (in Fig. 1, being labeled as N), the output of switching power circuit 300 connects the power end VCC of governor circuit 200 and the light current voltage end of load 400 simultaneously, and governor circuit 200 also connects load 400.It should be noted that, governor circuit 200 is the existing control circuits that microprocessor (as single-chip microcomputer, ARM or other possess the programming device of mathematical logic disposal ability) is core of take herein.
Capacitor discharging circuit 100 comprises discharge device 101 and discharge switch 102; The input of discharge device 101 connects the positive pole of filter capacitor E, the output of discharge device 101 connects the input of discharge switch 102, the negative pole of the output of discharge switch 102 and filter capacitor E is connected to ground altogether, discharge device 101 forms discharge loop with discharge switch 102 and filter capacitor E, and the controlled end of discharge switch 102 receives the control voltage V of governor circuit 200 outputs
cTR, when the power supply of electronic equipment is switched on, discharge switch 102 is according to controlling voltage V
cTRdisconnect discharge loop, when the power cut-off of electronic equipment, discharge switch 102 is because receiving control voltage V
cTRand open discharge loop, so that filter capacitor E is discharged.
Further, as shown in Figure 2, above-mentioned discharge device 101 can be specifically power resistor R, and the first end of power resistor R and the second end are respectively input and the output of discharge device 101.Above-mentioned discharge switch 102 can be specifically relay K, the switch contact 1 of relay K and first is controlled input and the controlled end that contact 3 is respectively discharge switch 102, and the normally-closed contact 2 of relay K and the second common contact of controlling contact 4 are the output of discharge switch 102.
Below in conjunction with operation principle, the capacitor discharging circuit shown in Fig. 2 is described further:
When the power supply of electronic equipment is switched on, alternating current enters rectifier bridge BD by live wire L and zero line N, it is the level and smooth direct current of output waveform after rectifier bridge BD and filter capacitor E rectifying and wave-filtering, this direct current is divided into two-way, lead up to after switching power circuit 300 and obtain light current voltage, this light current voltage offers governor circuit 200 and load 400 is used, and another road is directly load 400 power supplies.Now, governor circuit 200 obtains electric and output control voltage V
cTR, and then normally-closed contact 2 disconnections of control relay K, thereby the formed discharge loop of power resistor R, relay K and filter capacitor E disconnects, and has reached the normal work of avoiding affecting other circuit.
When the power supply of electronic equipment disconnects, switching power circuit 300 Non voltage outputs, governor circuit 200 quits work thereupon, and governor circuit 200 also just stops output and controls voltage V
cTRso, the normally-closed contact 2 of relay K returns to closure state, and then makes power resistor R, relay K and the formed discharge loop of filter capacitor E open-minded, and the form that in filter capacitor E, stored electric energy just can heat energy consumes release on power resistor R.
From above-mentioned operation principle, power resistor R plays electric energy is carried out to heat loss to realize the effect of electric discharge, so in other embodiment of the utility model, discharge device 101 can also be that other can realize with same form the discharge load of electric discharge.In addition, because relay K is that voltage V is controlled in 200 outputs according to governor circuit
cTRrealize switch motion, so in other embodiment of the utility model, discharge switch 102 can also be to take the switching circuit that triode, metal-oxide-semiconductor or other semiconductor switch devices be core.
In addition, when the power supply of electronic equipment initially powers on, between P and N because discharge switch 102 is kept closed short circuit, for the immediate current producing between P and N being suppressed when powering on, to prevent that short circuit from causing damage to other components and parts in electronic equipment, in another embodiment of the utility model, as shown in Figure 3, capacitor discharging circuit 100 also comprises short-circuit protection device 103, it is connected between the positive pole of filter capacitor E and the input of discharge device 101, by short-circuit protection device 103, when the power supply of electronic equipment initially powers on, circuit is realized to short-circuit protection.
Further, as shown in Figure 4, above-mentioned short-circuit protection device 103 can be specifically piezo-resistance ZR.
The application of capacitor discharging circuit 100 based on shown in above-mentioned Fig. 1 to Fig. 4 in electronic equipment, the utility model embodiment also provides a kind of electronic equipment, it comprises above-mentioned rectifier bridge BD, filter capacitor E, governor circuit 200, switching power circuit 300 and load 400, and comprises above-mentioned capacitor discharging circuit 100.
In sum, the utility model embodiment by adopting the capacitor discharging circuit 100 that comprises discharge device 101 and discharge switch 102 in electronic equipment, and its circuit structure is simple and cost is low; By discharge device 101, form discharge loop with discharge switch 102 and filter capacitor E, when the power supply of electronic equipment is switched on, discharge switch 102 is according to the control voltage V of governor circuit 200 outputs
cTRdisconnect discharge loop, to avoid affecting the normal work of other circuit in electronic equipment; When the power cut-off of electronic equipment, discharge switch 102 is not because receiving the control voltage V of governor circuit 200 outputs
cTRand open discharge loop, so that filter capacitor E is discharged, thereby can guarantee that circuit cost is low, can when electronic equipment power-off, to filter capacitor, realize electric discharge again, solved that prior art is existing cannot both guarantee that circuit cost was low, can when power supply is switched on, not affect the normal work of other circuit again, and electric capacity is realized the problem of electric discharge when power cut-off.In addition; capacitor discharging circuit 100 also can comprise short-circuit protection device 103; it is for when electronic equipment powers on, the immediate current producing because of short circuit between P and N being suppressed, to prevent that short circuit from causing damage to other components and parts in electronic equipment, plays the effect of short-circuit protection.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. a capacitor discharging circuit, be connected with rectifier bridge, filter capacitor, governor circuit, switching power circuit and load in electronic equipment, described rectifier bridge and described filter capacitor carry out alternating current to export direct current to described load and described switching power circuit after rectifying and wave-filtering, described switching power circuit provides light current voltage according to described direct current for described governor circuit and described load, and described governor circuit is controlled described loaded work piece; When power supply when energising of described electronic equipment, described governor circuit output is controlled voltage to described capacitor discharging circuit, and when the power cut-off of described electronic equipment, described governor circuit stops exporting described control voltage; It is characterized in that:
Described capacitor discharging circuit comprises discharge device and discharge switch, the input of described discharge device connects the positive pole of described filter capacitor, the output of described discharge device connects the input of described discharge switch, the output of described discharge switch and the negative pole of described filter capacitor are connected to ground altogether, described discharge device and described discharge switch and described filter capacitor form discharge loop, the controlled end of described discharge switch receives the control voltage of described governor circuit output, when the power supply of described electronic equipment is switched on, described discharge switch disconnects described discharge loop according to described control voltage, when the power cut-off of described electronic equipment, described discharge switch is not opened described discharge loop because receiving described control voltage, so that described filter capacitor is discharged.
2. capacitor discharging circuit as claimed in claim 1, is characterized in that, described capacitor discharging circuit also comprises short-circuit protection device, and described short-circuit protection device is connected between the positive pole of described filter capacitor and the input of described discharge device.
3. capacitor discharging circuit as claimed in claim 1, is characterized in that, described discharge device is power resistor, and the first end of described power resistor and the second end are respectively input and the output of described discharge device.
4. capacitor discharging circuit as claimed in claim 1, it is characterized in that, described discharge switch is relay, the switch contact of described relay and first is controlled input and the controlled end that contact is respectively described discharge switch, the output that the normally-closed contact of described relay and the second common contact of controlling contact are described discharge switch.
5. capacitor discharging circuit as claimed in claim 2, is characterized in that, described short-circuit protection device is piezo-resistance.
6. an electronic equipment, comprises rectifier bridge, filter capacitor, governor circuit, switching power circuit and load, it is characterized in that, described electronic equipment also comprises the capacitor discharging circuit as described in claim 1-5 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420226034.8U CN203911743U (en) | 2014-05-05 | 2014-05-05 | Electronic device and capacitor discharge circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420226034.8U CN203911743U (en) | 2014-05-05 | 2014-05-05 | Electronic device and capacitor discharge circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN203911743U true CN203911743U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420226034.8U Expired - Lifetime CN203911743U (en) | 2014-05-05 | 2014-05-05 | Electronic device and capacitor discharge circuit thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980036A (en) * | 2015-06-30 | 2015-10-14 | 广东欧珀移动通信有限公司 | Fly-back switch power supply circuit |
| CN105302214A (en) * | 2015-10-22 | 2016-02-03 | 珠海格力电器股份有限公司 | Standby control circuit, standby control method and electrical apparatus |
| CN105991025A (en) * | 2015-03-05 | 2016-10-05 | 深圳奥特迅电力设备股份有限公司 | Discharge control system |
| CN107154746A (en) * | 2016-03-03 | 2017-09-12 | 通用汽车环球科技运作有限责任公司 | Equipment for discharging high-voltage bus |
| CN109713887A (en) * | 2019-02-28 | 2019-05-03 | 苏州浪潮智能科技有限公司 | A kind of Switching Power Supply and its output circuit |
| CN109917162A (en) * | 2019-03-25 | 2019-06-21 | 昆山龙腾光电有限公司 | A kind of power protecting circuit and test device |
| CN113572348A (en) * | 2021-07-27 | 2021-10-29 | 捷蒽迪电子科技(上海)有限公司 | Switch circuit with residual voltage releasing function |
-
2014
- 2014-05-05 CN CN201420226034.8U patent/CN203911743U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991025A (en) * | 2015-03-05 | 2016-10-05 | 深圳奥特迅电力设备股份有限公司 | Discharge control system |
| CN104980036A (en) * | 2015-06-30 | 2015-10-14 | 广东欧珀移动通信有限公司 | Fly-back switch power supply circuit |
| CN104980036B (en) * | 2015-06-30 | 2018-05-25 | 广东欧珀移动通信有限公司 | A kind of inverse-excitation type switch power-supply circuit |
| CN105302214A (en) * | 2015-10-22 | 2016-02-03 | 珠海格力电器股份有限公司 | Standby control circuit, standby control method and electrical apparatus |
| CN107154746A (en) * | 2016-03-03 | 2017-09-12 | 通用汽车环球科技运作有限责任公司 | Equipment for discharging high-voltage bus |
| CN107154746B (en) * | 2016-03-03 | 2019-09-13 | 通用汽车环球科技运作有限责任公司 | Equipment for discharging high-voltage bus |
| CN109713887A (en) * | 2019-02-28 | 2019-05-03 | 苏州浪潮智能科技有限公司 | A kind of Switching Power Supply and its output circuit |
| CN109917162A (en) * | 2019-03-25 | 2019-06-21 | 昆山龙腾光电有限公司 | A kind of power protecting circuit and test device |
| CN109917162B (en) * | 2019-03-25 | 2021-08-06 | 昆山龙腾光电股份有限公司 | Power supply protection circuit and testing device |
| CN113572348A (en) * | 2021-07-27 | 2021-10-29 | 捷蒽迪电子科技(上海)有限公司 | Switch circuit with residual voltage releasing function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |