CN204205545U - Power overcurrent protection circuit - Google Patents
Power overcurrent protection circuit Download PDFInfo
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- CN204205545U CN204205545U CN201420579179.6U CN201420579179U CN204205545U CN 204205545 U CN204205545 U CN 204205545U CN 201420579179 U CN201420579179 U CN 201420579179U CN 204205545 U CN204205545 U CN 204205545U
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- 230000000052 comparative effect Effects 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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Abstract
The utility model discloses a kind of power overcurrent protection circuit, comprising: Acquisition Circuit, for gathering Switching Power Supply to the current value on the power supply branch road of arbitrary load, and sending to comparison circuit after converting this current value to corresponding voltage signal; Comparison circuit, for described voltage signal and the reference signal preset being compared, and sends on/off signal according to comparative result to time delay testing circuit; Time delay testing circuit, sends to switching circuit, or described break signal is sent to switching circuit after described messenger is postponed preset time period; Switching circuit, for performing on/off operation according to described on/off signal to corresponding described power supply branch road.The utility model can to avoid in central power supply system influencing each other of each power supply branch road, improves system robustness.
Description
Technical field
The utility model relates to power technique fields, in particular to a kind of power overcurrent protection circuit.
Background technology
In central power supply system, a usual power supply needs simultaneously to multiple power terminal equipment.As in vehicle-mounted monitoring system, for car-mounted terminal, as vehicle-mounted SD card video tape recorder, vehicle-mounted U-disk video recording machine, vehicle-mounted hard disk videocorder, vehicle-mounted vidicon etc., usually be all adopt this centralized power supply system, by rear end equipment such as vehicle-mounted hard disk videocorders, the headend equipments such as vehicle-mounted vidicon powered.
Normally; each Terminal Equipment Power of centrally connected power supply is non-separate, when a wherein road terminal equipment occurs abnormal and when causing power supply overcurrent, power supply can enter guard mode automatically; thus other terminal equipment can be caused to occur powered-off fault and restart, have a strong impact on Consumer's Experience.
For this reason, occur by distributing independent current source with power supply for each terminal equipment in prior art, thus it is separate to realize between terminal equipment, avoid because wherein a certain road terminal equipment causes all terminal equipment power down and the problem of restarting extremely, but the program needs for each terminal equipment distributes independent current source, its integrated cost is higher, and needs to take larger volume.
Meanwhile; another kind of prior art by sealing in resettable fuse on each tributary circuit; described resettable fuse is a kind of overcurrent electrical protection component; adopt macromolecule organic polymer under the condition of high pressure, high temperature, vulcanization reaction; after dashing with particulate materials, form through special processes.The overcurrent protection of traditional insurance silk, only can protect once, blown and needed to change, and resettable fuse has overcurrent and overheating protection, automatically recovers dual-use function.Power supply can be protected when terminal equipment abnormal overload to a certain extent by sealing in resettable fuse on each tributary circuit.But resettable fuse device is natural exists the slow characteristic of response speed, when mistake flow point close to Switching Power Supply of the overcurrent condition of branched bottom, whole passage power-off still can be caused.
Utility model content
The influencing each other of each power supply branch road in central power supply system, improve system robustness, the object of the utility model embodiment is to provide a kind of power overcurrent protection circuit.
The utility model embodiment realizes by the following technical solutions:
A kind of power overcurrent protection circuit, comprising:
Acquisition Circuit, for gathering Switching Power Supply to the current value on the power supply branch road of arbitrary load, and sends to comparison circuit after converting this current value to corresponding voltage signal;
Comparison circuit, for described voltage signal and the reference signal preset being compared, and sends on/off signal according to comparative result to time delay testing circuit;
Time delay testing circuit, sends to switching circuit, or described break signal is sent to switching circuit after described messenger is postponed preset time period;
Switching circuit, for performing on/off operation according to described on/off signal to corresponding described power supply branch road.
Preferably, described Acquisition Circuit comprises: amplifier U1 and the resistance R1 be serially connected with between Switching Power Supply and switching circuit, the in-phase end of amplifier U1 is connected to resistance R1 one end near switched power output Vin, and the end of oppisite phase of amplifier U1 is connected to the other end of resistance R1.
Preferably, described comparison circuit comprises: resistance R2, resistance R3, resistance R10, electric capacity C1 and comparator U2, one end of the output connecting resistance R2 of amplifier U1, the other end connecting resistance R3 of resistance R2 and electric capacity C1, the other end ground connection of electric capacity C1, the in-phase end of another termination comparator U2 of resistance R3, the one termination reference signal Vref of resistance R4, the end of oppisite phase of another termination comparator U2 of resistance R4, the input of the output termination time delay testing circuit of comparator U2, resistance R10 is serially connected with the in-phase end of comparator U2 between output.
Preferably, described time delay testing circuit comprises: resistance R5, resistance R6, electric capacity C2 and Schottky tube D1, one end of resistance R6 and the positive pole of Schottky tube D1 connect the output of comparison circuit, the input of another termination switching circuit of resistance R6, the negative pole of Schottky tube D1 connects the input of switching circuit by resistance R5.
Preferably, described switching circuit comprises: resistance R7, resistance R8, resistance R9, NPN pipe VT2, and P-MOS pipe VT1, the output of the one termination time delay testing circuit of resistance R7, the ground level of another termination NPN pipe VT2 of resistance R7, NPN pipe VT2 penetrates a grade ground connection, the collector electrode connecting resistance R9 of NPN pipe VT2, the other end of electricity group R9 connects the grid of P-MOS pipe VT1 and one end of resistance R8 respectively, the other end of resistance R8 is connected with the source class of P-MOS pipe VT1 respectively, the source class of P-MOS pipe VT1 is also connected with switched power output Vin by resistance R1, the drain electrode of P-MOS pipe VT1 is connected with the power input Vout of load.
The utility model is by carrying out independent monitoring to each power supply branch road, Real-time Collection is respectively powered the electric current of branch road, the reference signal preset after being converted to corresponding voltage signal compares, according to comparative result control switch circuit, (on/off) operation is opened or closed to power supply branch road, thus realize the overcurrent events of each power supply branch road is carried out to independence monitoring and controls.Adopt the utility model, influencing each other of each power supply branch road can be avoided in central power supply system, improve system robustness.
Accompanying drawing explanation
The power overcurrent protection circuit illustrative view of functional configuration that Fig. 1 provides for the utility model embodiment;
The power overcurrent protection circuit figure that Fig. 2 provides for the utility model embodiment.
The realization of the utility model object, functional characteristics and excellent effect, be described further below in conjunction with specific embodiment and accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme described in the utility model is described in further detail, to make those skilled in the art better can understand the utility model being implemented, but illustrated embodiment is not as to restriction of the present utility model.
As shown in Figure 1, the power overcurrent protection circuit that the utility model embodiment provides, comprising:
Acquisition Circuit 30, for gathering Switching Power Supply 10 to the current value on the power supply branch road 100 of arbitrary load 20, and sends to comparison circuit 40 after converting this current value to corresponding voltage signal;
Comparison circuit 40, for described voltage signal and the reference signal preset being compared, and sends on/off signal according to comparative result to time delay testing circuit 60;
Time delay testing circuit 60, sends to switching circuit 50, or described break signal is sent to switching circuit 50 after described messenger is postponed preset time period;
Switching circuit 50, for performing on/off operation according to described on/off signal to corresponding described power supply branch road 100.
In the present embodiment, described Switching Power Supply 10 is connected with multiple load 20 (such as terminal equipment), and at this power overcurrent protection circuit of power supply branch road 100 deploy that it is formed.
When described voltage signal compares with the reference signal preset by described comparison circuit 40, when described voltage signal is greater than default reference signal, then illustrate and overcurrent events has appearred in corresponding power supply branch road 100, now, comparison circuit 40 sends the on/off signal performing disconnected operation in order to control switch circuit 50 to switching circuit 50 by time delay testing circuit 60, perform disconnected operation to make switching circuit 50 after getting this on/off signal to corresponding power supply branch road 100.On the other hand, when described voltage signal is less than default reference signal, then illustrate and corresponding power supply branch road 100 does not occur overcurrent events, now, comparison circuit 40 sends the on/off signal performing logical operation in order to control switch circuit 50 to switching circuit 50 by time delay testing circuit 60, perform logical operation to make switching circuit 50 after getting this on/off signal to corresponding power supply branch road 100.Power branch road 100 never there is overcurrent events time, then comparison circuit 40 keeps sending on/off signal in order to maintain the conducting of power supply branch road 100 to switching circuit 50 always.
Particularly, in the present embodiment, time delay testing circuit 60 sends to switching circuit 50 after described messenger is postponed preset time period, or described break signal is sent to switching circuit 50.
The power overcurrent protection circuit that the utility model embodiment provides is by carrying out independent monitoring to each power supply branch road 100; Real-time Collection is respectively powered the electric current of branch road 100; the reference signal preset after being converted to corresponding voltage signal compares; according to comparative result control switch circuit 50, (on/off) operation is opened or closed to power supply branch road 100, thus realize the overcurrent events of each power supply branch road 100 is carried out to independence monitoring and controls.Adopt the utility model, influencing each other of each power supply branch road 100 can be avoided in central power supply system, improve system robustness.
Particularly, as shown in Figure 2, described Acquisition Circuit 30 comprises amplifier U1 and is serially connected with the resistance R1 between Switching Power Supply 10 and switching circuit 50, the in-phase end of amplifier U1 is connected to resistance R1 one end near Switching Power Supply 10 output Vin, and the end of oppisite phase of amplifier U1 is connected to the other end of resistance R1.
Described comparison circuit 40 comprises: resistance R2, resistance R3, resistance R10, electric capacity C1 and comparator U2, one end of the output connecting resistance R2 of amplifier U1, the other end connecting resistance R3 of resistance R2 and electric capacity C1, the other end ground connection of electric capacity C1, the in-phase end of another termination comparator U2 of resistance R3, the one termination reference signal Vref of resistance R4, the end of oppisite phase of another termination comparator U2 of resistance R4, the input of the output termination time delay testing circuit 60 of comparator U2, resistance R10 is serially connected with the in-phase end of comparator U2 between output.
Described time delay testing circuit 60 comprises: resistance R5, resistance R6, electric capacity C2 and Schottky tube D1, one end of resistance R6 and the positive pole of Schottky tube D1 connect the output of comparison circuit 40, the input of another termination switching circuit 50 of resistance R6, the negative pole of Schottky tube D1 connects the input of switching circuit 50 by resistance R5.
Described switching circuit 50 comprises: resistance R7, resistance R8, resistance R9, NPN pipe VT2, and P-MOS pipe VT1, the output of the one termination time delay testing circuit 60 of resistance R7, the ground level of another termination NPN pipe VT2 of resistance R7, NPN pipe VT2 penetrates a grade ground connection, the collector electrode connecting resistance R9 of NPN pipe VT2, the other end of electricity group R9 connects the grid of P-MOS pipe VT1 and one end of resistance R8 respectively, the other end of resistance R8 is connected with the source class of P-MOS pipe VT1 respectively, the source class of P-MOS pipe VT1 is also connected with switched power output Vin by resistance R1, the drain electrode of P-MOS pipe VT1 is connected with the power input Vout of load 20.
Below the operation principle of power overcurrent protection circuit is as shown in Figure 2 described:
First, amplifier U1 passes through the electric current on collection resistance R1 and is converted to voltage signal to export, and carries out first-order filtering by the filter of resistance R2, electric capacity C1 composition;
Then, the voltage signal that comparator 40 comparison amplifier U1 exports and reference signal Vref, when voltage signal is greater than reference signal Vref, comparator U2 exports high level, when voltage signal is less than reference signal Vref, comparator U2 output low level.Wherein, comparator U2 is hysteresis comparator, avoids voltage signal to be export repeatedly to shake near reference signal Vref.
Secondly, time delay testing circuit 60 realizes quick charge, discharges at a slow speed.When input terminal voltage is high, system to electric capacity C2 quick charge, makes the base voltage of NPN pipe VT2 rise rapidly by Schottky tube D1 and resistance R5; When voltage is low, system makes electric capacity C2 discharge at a slow speed by resistance R6, and the base voltage of NPN pipe VT2 is slowly declined.
Finally, after the base voltage of NPN pipe VT2 rises to the collector electrode meeting NPN pipe VT2 and penetrates grade conducting, the grid of P-MOS pipe VT1 is undercuted, and P-MOS pipe VT1 disconnects, system stopping supplying power for outside.Now, the electric current flowing through resistance R1 sharply declines, by with above-mentioned same process, comparator U2 output low level, therefore electric capacity C2 is slowly discharged by resistance R6, the base voltage of NPN pipe VT2 is slowly declined, after dropping to and making NPN pipe VT2 reach cut-off state, the grid voltage of P-MOS pipe VT1 pipe is drawn high, and system makes P-MOS pipe VT1 conducting supplying power for outside again.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (1)
1. a power overcurrent protection circuit, is characterized in that, comprising:
Acquisition Circuit, for gathering Switching Power Supply to the current value on the power supply branch road of arbitrary load, and sends to comparison circuit after converting this current value to corresponding voltage signal;
Comparison circuit, for described voltage signal and the reference signal preset being compared, and sends on/off signal according to comparative result to time delay testing circuit;
Time delay testing circuit, sends to switching circuit, or described break signal is sent to switching circuit after described messenger is postponed preset time period;
Switching circuit, for performing on/off operation according to described on/off signal to corresponding described power supply branch road;
Described Acquisition Circuit comprises: amplifier U1 and the resistance R1 be serially connected with between Switching Power Supply and switching circuit, the in-phase end of amplifier U1 is connected to resistance R1 one end near switched power output Vin, and the end of oppisite phase of amplifier U1 is connected to the other end of resistance R1;
Described comparison circuit comprises: resistance R2, resistance R3, resistance R10, electric capacity C1 and comparator U2, one end of the output connecting resistance R2 of amplifier U1, the other end connecting resistance R3 of resistance R2 and electric capacity C1, the other end ground connection of electric capacity C1, the in-phase end of another termination comparator U2 of resistance R3, the one termination reference signal Vref of resistance R4, the end of oppisite phase of another termination comparator U2 of resistance R4, the input of the output termination time delay testing circuit of comparator U2, resistance R10 is serially connected with the in-phase end of comparator U2 between output;
Described time delay testing circuit comprises: resistance R5, resistance R6, electric capacity C2 and Schottky tube D1, one end of resistance R6 and the positive pole of Schottky tube D1 connect the output of comparison circuit, the input of another termination switching circuit of resistance R6, the negative pole of Schottky tube D1 connects the input of switching circuit by resistance R5;
Described switching circuit comprises: resistance R7, resistance R8, resistance R9, NPN pipe VT2, and P-MOS pipe VT1, the output of the one termination time delay testing circuit of resistance R7, the ground level of another termination NPN pipe VT2 of resistance R7, NPN pipe VT2 penetrates a grade ground connection, the collector electrode connecting resistance R9 of NPN pipe VT2, the other end of electricity group R9 connects the grid of P-MOS pipe VT1 and one end of resistance R8 respectively, the other end of resistance R8 is connected with the source class of P-MOS pipe VT1 respectively, the source class of P-MOS pipe VT1 is also connected with switched power output Vin by resistance R1, the drain electrode of P-MOS pipe VT1 is connected with the power input Vout of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420579179.6U CN204205545U (en) | 2014-09-30 | 2014-09-30 | Power overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420579179.6U CN204205545U (en) | 2014-09-30 | 2014-09-30 | Power overcurrent protection circuit |
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| Publication Number | Publication Date |
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| CN204205545U true CN204205545U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420579179.6U Expired - Lifetime CN204205545U (en) | 2014-09-30 | 2014-09-30 | Power overcurrent protection circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024337A (en) * | 2015-07-24 | 2015-11-04 | 西安空间无线电技术研究所 | Over-current protection circuit used for integrated circuit |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
| CN106786344A (en) * | 2016-12-20 | 2017-05-31 | 乐视汽车（北京）有限公司 | Overcurrent protective device, method, system and electronic equipment |
| CN106848997A (en) * | 2017-04-10 | 2017-06-13 | 上海联影医疗科技有限公司 | The protector and method of a kind of electron gun beam-control(led) system |
| CN107546724A (en) * | 2017-07-17 | 2018-01-05 | 北方电子研究院安徽有限公司 | A kind of input overcurrent protective device |
| CN107565509A (en) * | 2017-10-11 | 2018-01-09 | 安徽衡孚电子科技有限公司 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
| CN107993682A (en) * | 2017-12-29 | 2018-05-04 | 力瑞信（深圳）科技有限公司 | A kind of overvoltage crowbar and solid state hard disc |
| CN108258893A (en) * | 2016-12-29 | 2018-07-06 | 亚瑞源科技（深圳）有限公司 | Overcurrent protection circuit |
| CN108731213A (en) * | 2018-08-16 | 2018-11-02 | 珠海恒途电子有限公司 | A kind of guard time adjusts circuit, PFC current foldback circuits and controller |
| CN108957108A (en) * | 2018-08-17 | 2018-12-07 | 无锡麟力科技有限公司 | A kind of mains failure detection circuit |
| CN110854991A (en) * | 2019-11-29 | 2020-02-28 | 苏州浪潮智能科技有限公司 | Power supply control circuit |
-
2014
- 2014-09-30 CN CN201420579179.6U patent/CN204205545U/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024337A (en) * | 2015-07-24 | 2015-11-04 | 西安空间无线电技术研究所 | Over-current protection circuit used for integrated circuit |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
| CN105870874B (en) * | 2016-04-28 | 2019-11-29 | 上海斐讯数据通信技术有限公司 | A kind of current foldback circuit |
| CN106786344A (en) * | 2016-12-20 | 2017-05-31 | 乐视汽车（北京）有限公司 | Overcurrent protective device, method, system and electronic equipment |
| CN108258893B (en) * | 2016-12-29 | 2020-10-30 | 亚瑞源科技（深圳）有限公司 | Overcurrent protection circuit |
| CN108258893A (en) * | 2016-12-29 | 2018-07-06 | 亚瑞源科技（深圳）有限公司 | Overcurrent protection circuit |
| CN106848997A (en) * | 2017-04-10 | 2017-06-13 | 上海联影医疗科技有限公司 | The protector and method of a kind of electron gun beam-control(led) system |
| CN106848997B (en) * | 2017-04-10 | 2019-05-21 | 上海联影医疗科技有限公司 | A kind of protective device and method of electron gun beam-control(led) system |
| CN107546724A (en) * | 2017-07-17 | 2018-01-05 | 北方电子研究院安徽有限公司 | A kind of input overcurrent protective device |
| CN107565509A (en) * | 2017-10-11 | 2018-01-09 | 安徽衡孚电子科技有限公司 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
| CN107993682A (en) * | 2017-12-29 | 2018-05-04 | 力瑞信（深圳）科技有限公司 | A kind of overvoltage crowbar and solid state hard disc |
| CN107993682B (en) * | 2017-12-29 | 2023-10-31 | 力瑞信（深圳）科技有限公司 | Overvoltage protection circuit and solid state disk |
| CN108731213A (en) * | 2018-08-16 | 2018-11-02 | 珠海恒途电子有限公司 | A kind of guard time adjusts circuit, PFC current foldback circuits and controller |
| CN108731213B (en) * | 2018-08-16 | 2024-11-15 | 珠海恒途电子有限公司 | A protection time adjustment circuit, PFC overcurrent protection circuit and controller |
| CN108957108A (en) * | 2018-08-17 | 2018-12-07 | 无锡麟力科技有限公司 | A kind of mains failure detection circuit |
| CN108957108B (en) * | 2018-08-17 | 2024-03-12 | 无锡麟力科技有限公司 | Commercial power outage detection circuit |
| CN110854991A (en) * | 2019-11-29 | 2020-02-28 | 苏州浪潮智能科技有限公司 | Power supply control circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150311 |