CN206164074U - Power supply overcurrent protection circuit - Google Patents
Power supply overcurrent protection circuit Download PDFInfo
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- CN206164074U CN206164074U CN201621047932.2U CN201621047932U CN206164074U CN 206164074 U CN206164074 U CN 206164074U CN 201621047932 U CN201621047932 U CN 201621047932U CN 206164074 U CN206164074 U CN 206164074U
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- 230000004224 protection Effects 0.000 title claims abstract description 51
- 238000005070 sampling Methods 0.000 claims abstract description 42
- 230000005611 electricity Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a power supply overcurrent protection circuit, which comprises a switch tube, an overcurrent judgment module and a self-locking protection module, wherein the output end of the switch tube is used as the enabling end of a control power supply switch; the overcurrent judging module outputs a first control signal to enable the switching tube to be conducted through the first voltage comparator under the condition that the first voltage comparator judges that the current flowing through the sampling resistor is larger than the threshold value; one end of the sampling resistor is connected with the output end of the load power supply. The self-locking protection module outputs a second control signal through a second voltage comparator under the condition that the first control signal received through the second voltage comparator is greater than the reference voltage; the second control signal is used as a feedback signal of the second voltage comparator and keeps the switch tube conductive. The utility model discloses a power overcurrent protection circuit can directly sample output load current, can set up in a flexible way and overflow the threshold value, and has self-locking function.
Description
Technical field
The utility model is related to a kind of circuit, more particularly to a kind of power overcurrent protection circuit.
Background technology
At present, the method that insulating power supply is used mostly primary side current of transformer detection, by judging input power, so as to sentence
Disconnected whether excessively stream；When former limit input current becomes big, the voltage for feeding back to control chip is raised, trigger protection action.
But the problem for existing is：Because the sensibility reciprocal of each transformer primary side has an error, control chip itself is touched
The threshold value made is started also to have error, so the excessively stream threshold value of this scheme arranges not accurate enough.And, output overcurrent is passed through
The buffering of output electrochemical capacitor, then a level of power supply is passed to, protection is difficult to accomplish accurately and timely.
Industry also has some non-isolated power supplys, and its control chip does not have overcurrent protection function, by limit power work, i.e., when
During output overcurrent, output voltage is reduced.This mode, may cause the device on output circuit seriously to generate heat, until damaging.
Utility model content
The purpose of the utility model embodiment is to provide a kind of power overcurrent protection circuit, and can directly sample output loading electricity
Stream, can more directly perceived, in time and accurately judge whether excessively stream.
For achieving the above object, the utility model embodiment provides a kind of power overcurrent protection circuit, including：
Switching tube, the output end of the switching tube is used as the Enable Pin for controlling power switch；
Excessively stream judge module, is judging to flow through the situation of the electric current more than threshold value of sampling resistor by first voltage comparator
Under, exporting the first control signal by the first voltage comparator turns on the switching tube；Wherein, the sampling resistor
One end connects load power source output end.
Compared with prior art, a kind of power overcurrent protection circuit disclosed in the utility model passes through techniques described above side
Case, the program, come load current of directly sampling, and judges to flow through the electricity of sampling resistor by sampling resistor by voltage comparator
Whether stream be more than threshold value, once judging to flow through the electric current of sampling resistor, more than threshold value, (i.e. power supply output loop occurs overcurrent
Or short circuit), exporting high level by voltage comparator turns on switching tube, so that the output end output of switching tube enables signal
Power-off is closed, solve prior art has error, protection not prompt enough accurately to ask by detection voltage device primary current
Topic, obtains excessively stream judgement beneficial effect promptly and accurately.
Used as the improvement of such scheme, the power overcurrent protection circuit also includes：Self-lock protection module, by second
Voltage comparator receives first control signal more than in the case of reference voltage, defeated by the second voltage comparator
Go out the second control signal；Wherein, second control signal as the second voltage comparator feedback signal and make institute
State switching tube to be held on.
As the improvement of such scheme, by increasing self-lock protection module in power overcurrent protection circuit self-locking is realized
Function, can prevent load abnormal from causing excessively stream, power supply constantly to restart, impact failure power supply.
Used as the improvement of such scheme, the excessively stream judge module also includes first resistor and second resistance；
The in-phase input end of the first voltage comparator is connected between the first resistor and the second resistance, institute
The other end for stating first resistor is connected to one end of the sampling resistor, the other end ground connection of the second resistance；Described first
The inverting input of voltage comparator is connected to the other end of sampling resistor, and one end of the sampling resistor is also connected with the load
Power output end；The output end of the first voltage comparator connects the control end of the switching tube.
As the improvement of such scheme, compared using resistance and first voltage by arranging to be connected in excessively stream judge module
First resistor and second resistance between device, and change excessively stream threshold by adjusting the resistance matching of first resistor and second resistance
Value, so that over-current protection point can be flexibly set, it is portable high, it is adaptable to all constant voltage source output protections.
Used as the improvement of such scheme, the self-lock protection module also includes power supply, the 5th resistance and the 6th resistance；It is described
The in-phase input end of second voltage comparator is connected to the output end of the first voltage comparator by an one-way conduction element,
And the in-phase input end of the second voltage comparator connects the output end of the one-way conduction element, the second voltage compares
The inverting input of device is connected between the 5th resistance and the 6th resistance, and the other end of the 5th resistance is connected to
The power supply, the other end ground connection of the 6th resistance；
The output end of the second voltage comparator connects the control end of the switching tube, the second voltage comparator
Output end is also connected with the in-phase input end of the second voltage comparator.
Used as the improvement of such scheme, the excessively stream judge module also includes 3rd resistor, and the 3rd resistor is connected to
Between the inverting input of load power source output end and the first voltage comparator.
Used as the improvement of such scheme, the excessively stream judge module also includes the 4th resistance, one end of the 4th resistance
The inverting input of the first voltage comparator is connected to, the other end of the 4th resistance is connected to the first voltage ratio
Compared with the output end of device.
Used as the improvement of such scheme, the self-lock protection module also includes the 7th resistance, the second voltage comparator
Output end the in-phase input end of the second voltage comparator is connected to by the 7th resistance.
Used as the improvement of such scheme, the self-lock protection module also includes the 8th resistance, the second voltage comparator
Output end the control end of the switching tube, the common end grounding of the switching tube are connected to by the 8th resistance.
Used as the improvement of such scheme, the one-way conduction element is diode, and the positive pole of the diode is connected to institute
State the output end of first voltage comparator；The negative pole of the diode is connected to the homophase input of the second voltage comparator
End.
Used as the improvement of such scheme, the switching tube is NPN type triode, the control end of the switching tube, common port,
Output end corresponds to respectively base stage, emitter stage, the colelctor electrode of the NPN type triode.
Description of the drawings
Fig. 1 is a kind of electrical block diagram of power overcurrent protection circuit in the utility model embodiment 1.
Fig. 2 is a kind of electrical block diagram of power overcurrent protection circuit in the utility model embodiment 2.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
It is a kind of structural representation of power overcurrent protection circuit that the utility model embodiment 1 is provided referring to Fig. 1.This
The power overcurrent protection circuit of embodiment includes excessively stream judge module 10 and switching tube 12.
Wherein, excessively stream judge module 10 include sampling resistor R0, first resistor R1, second resistance R2,3rd resistor R3 with
And voltage comparator 11, wherein：
Vout1 is load power source output end, typically exports setting voltage, is considered as source of stable pressure, on the output loop of power supply
Connect the sampling resistor R0, Vout for sampling resistor RO posterior nodal point (as sampling power output end), i.e. sampling resistor RO
Two ends connect respectively load power source output end vo ut1 and sampling power output end Vout.
First resistor R1 is connected between the in-phase input end of sampling resistor R0 and voltage comparator 11, second resistance R2
One end is connected to the in-phase input end of voltage comparator 11, and other end ground connection, 3rd resistor R3 is connected to sampling power output end
Between the inverting input of Vout and voltage comparator 12, the output end of voltage comparator 11 is connected to the control of switching tube 12
End.The output end of switching tube 12 is used as the Enable Pin for controlling power switch, the common end grounding of switching tube 12.
When being embodied as, the switching tube 12 can be NPN type triode, N-channel FET, IGBT, IGCT etc.
Three ports for control device or its derivation device.Wherein, the control end of switching tube 12, common port and output end, can correspond respectively to
The base stage of NPN type triode, emitter stage, colelctor electrode, the grid of N-channel FET, source electrode, drain electrode, the grid of IGBT, transmitting
Pole, colelctor electrode, the grid of unidirectional thyristor, negative electrode, anode, the grid of bidirectional thyristor, port 1, port 2.
Below for convenience of description, the technical scheme of the embodiment of the present invention is described only by taking NPN type triode as an example, this
Switching tube 12 in the power overcurrent protection circuit that invention is provided is not limited to NPN type triode.
As shown in figure 1, the homophase input terminal voltage of voltage comparator 11 is Vout1*R2/ (R1+R2), voltage comparator 11
Anti-phase input terminal voltage be Vout, by the resistance ratio for adjusting first resistor R1 and second resistance R2, thus it is possible to vary voltage
The homophase input terminal voltage of comparator 11, so as to change excessively stream threshold value.When being embodied as, in normal circuit operation, electric current is little
In threshold value so that the anti-phase input terminal voltage of voltage comparator 11 is more than the homophase input terminal voltage of voltage comparator 11, i.e.,
During Vout ＞ Vout1*R2/ (R1+R2), the output low level of voltage comparator 11.When output current increase, on sampling resistor R0
Pressure drop increases, and sampling power output end Vout reduces, when electric current is increased to more than threshold value so that the homophase of voltage comparator 11 is defeated
Enter anti-phase input terminal voltage of the terminal voltage more than voltage comparator 11, be i.e. during Vout≤Vout1*R2/ (R1+R2), be judged as
Stream, the output high level of voltage comparator 11, turns on switching tube 12, and the output of switching tube 12 enables signal and makes power-off.
Above-described embodiment 1 by sampling resistor R0 come load current of directly sampling, and by voltage comparator 11 judge flow
Whether the electric current of sampled resistance R0 is more than threshold value, once judging to flow through the electric current of sampling resistor R0, more than threshold value, (i.e. power supply is defeated
Go out loop and overcurrent or short circuit occur), exporting high level by voltage comparator 11 turns on switching tube 12, so that switch
Pipe 12 output end output enable signal-off power supply, solve prior art by detection voltage device primary current have error,
Accurate problem not prompt enough is protected, excessively stream judgement beneficial effect promptly and accurately is obtained.In addition, the present embodiment is by changing
The resistance ratio of first resistor R1 and second resistance R2, flexibly arranges current threshold, portable high, it is adaptable to all constant pressures
Power supply output protection.
It is that a kind of circuit structure of power overcurrent protection circuit that the utility model embodiment 2 is provided is illustrated referring to Fig. 2
Figure.The power overcurrent protection circuit of the present embodiment includes excessively stream judge module 20, one-way conduction element 22, self-lock protection module 23
With switching tube 25.
Wherein, excessively stream judge module 20 include sampling resistor R0, first resistor R1, second resistance R2,3rd resistor R3 and
Voltage comparator 21, wherein：
Vout1 is load power source output end, typically exports setting voltage, is considered as source of stable pressure, on the output loop of power supply
Connect the sampling resistor R0, Vout for sampling resistor RO posterior nodal point (as sampling power output end), i.e. sampling resistor RO
Two ends connect respectively load power source output end vo ut1 and sampling power output end Vout.
First resistor R1 is connected between the in-phase input end of sampling resistor R0 and voltage comparator 21, second resistance R2 mono-
End is connected to the in-phase input end of voltage comparator 21, other end ground connection, 3rd resistor R3 be connected to sampling power output end and
Between the inverting input of voltage comparator 21, the output end of voltage comparator 21 is connected to the input of one-way conduction element 22
End, 3rd resistor R3 is connected between sampling power output end Vout and the inverting input of voltage comparator 21, the 4th resistance
One end of R4 is connected to the inverting input of voltage comparator 21, and the other end of the 4th resistance R4 is connected to voltage comparator 21
Output end.
Self-lock protection module 23 includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, voltage ratio
Compared with device 24 and accessory power supply VCC, wherein：
The in-phase input end of voltage comparator 24 is connected to the output end of one-way conduction element 22, voltage comparator 24 it is anti-
Phase input is connected between the 5th resistance R5 and the 6th resistance R6, and the other end of the 5th resistance R5 is connected to accessory power supply VCC,
The other end ground connection of the 6th resistance R6, the output end of voltage comparator 21 is connected to voltage comparator 21 by the 7th resistance R7
In-phase input end, the output end of voltage comparator 21 is connected to the control end of switching tube 25, switching tube 25 by the 8th resistance R8
Common end grounding.
One-way conduction element 22 is diode, and the positive pole of the diode is connected to the output of the first voltage comparator
End；The negative pole of the diode is connected to the in-phase input end of the second voltage comparator.
When being embodied as, the switching tube 25 can be NPN type triode, N-channel FET, IGBT, IGCT etc.
Three ports for control device or its derivation device.Wherein, the control end of switching tube 25, common port and output end, can correspond respectively to
The base stage of NPN type triode, emitter stage, colelctor electrode, the grid of N-channel FET, source electrode, drain electrode, the grid of IGBT, transmitting
Pole, colelctor electrode, the grid of unidirectional thyristor, negative electrode, anode, the grid of bidirectional thyristor, port 1, port 2.
Below for convenience of description, the technical scheme of the embodiment of the present invention is described only by taking NPN type triode as an example, this
Switching tube 25 in the power overcurrent protection circuit that invention is provided is not limited to NPN type triode.
As shown in Fig. 2 the homophase input terminal voltage of voltage comparator 21 is Vout1*R2/ (R1+R2), voltage comparator 21
Anti-phase input terminal voltage be Vout, by the resistance ratio for adjusting first resistor R1 and second resistance R2, thus it is possible to vary voltage
The homophase input terminal voltage of comparator 21, so as to change excessively stream threshold value.When being embodied as, in normal circuit operation, electric current is little
In threshold value so that the anti-phase input terminal voltage of voltage comparator 21 is more than the homophase input terminal voltage of voltage comparator 21, i.e.,
During Vout ＞ Vout1*R2/ (R1+R2), the output low level of voltage comparator 21.When output current increase, on sampling resistor R0
Pressure drop increases, and sampling power output end Vout reduces, when electric current is increased to more than threshold value so that the homophase of voltage comparator 21 is defeated
Enter anti-phase input terminal voltage of the terminal voltage more than voltage comparator 21, be i.e. during Vout≤Vout1*R2/ (R1+R2), be judged as
Stream, the output high level of voltage comparator 21, turns on switching tube 25, and the output of switching tube 25 enables signal and makes power-off.
Compared with Example 1, above-described embodiment 2 increased self-lock protection module 23, one-way conduction element 22, once judge
The electric current of sampling resistor R0 is flowed through more than threshold value (i.e. power supply output loop occurs overcurrent or short circuit), by voltage comparator
21 output high level turn on one-way conduction element 22, by the 5th resistance R5, the 6th resistance R6, accessory power supply VCC, make voltage
The inverting input of comparator 24 obtains reference voltage V ref=Vcc*R6/ (R5+R6), when the height electricity of the output of voltage comparator 21
Mean longitude one-way conduction element 22 is connected to the in-phase input end of voltage comparator 24, and the level for making in-phase input end is higher than anti-phase input
End, voltage comparator 24 is output as high level, and feeds back to in-phase input end with the 7th resistance R7 so that voltage comparator 24 is defeated
Go out and keep high level, switching tube 25 is held on, and realizes lock function.
The above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of without departing from the utility model principle, some improvements and modifications can also be made, these improve and moisten
Decorations are also considered as protection domain of the present utility model.
Claims (10)
1. a kind of power overcurrent protection circuit, it is characterised in that include：
Switching tube, the output end of the switching tube is used as the Enable Pin for controlling power switch；
Excessively stream judge module, in the case where judging that the electric current for flowing through sampling resistor is more than threshold value by first voltage comparator,
Exporting the first control signal by the first voltage comparator turns on the switching tube；Wherein, the one of the sampling resistor
End connection load power source output end.
2. power overcurrent protection circuit as claimed in claim 1, it is characterised in that also include：
Self-lock protection module, by second voltage comparator situation of first control signal more than reference voltage is being received
Under, the second control signal is exported by the second voltage comparator；Wherein, second control signal is electric as described second
Press the feedback signal of comparator and be held on the switching tube.
3. power overcurrent protection circuit as claimed in claim 1, it is characterised in that the excessively stream judge module also includes first
Resistance and second resistance；
The in-phase input end of the first voltage comparator is connected between the first resistor and the second resistance, and described
The other end of one resistance is connected to one end of the sampling resistor, the other end ground connection of the second resistance；The first voltage
The inverting input of comparator is connected to the other end of sampling resistor, and one end of the sampling resistor is also connected with the load power source
Output end；The output end of the first voltage comparator connects the control end of the switching tube.
4. power overcurrent protection circuit as claimed in claim 2, it is characterised in that the self-lock protection module also includes electricity
Source, the 5th resistance and the 6th resistance；
The in-phase input end of the second voltage comparator is connected to the first voltage comparator by an one-way conduction element
Output end, and the in-phase input end of the second voltage comparator connects the output end of the one-way conduction element, described the
The inverting input of two voltage comparators is connected between the 5th resistance and the 6th resistance, the 5th resistance it is another
One end is connected to the power supply, the other end ground connection of the 6th resistance；
The output end of the second voltage comparator connects the control end of the switching tube, the output of the second voltage comparator
End is also connected with the in-phase input end of the second voltage comparator.
5. power overcurrent protection circuit as claimed in claim 3, it is characterised in that the excessively stream judge module also includes the 3rd
Resistance, the 3rd resistor is connected between sampling power output end and the inverting input of the first voltage comparator.
6. power overcurrent protection circuit as claimed in claim 5, it is characterised in that the excessively stream judge module also includes the 4th
Resistance, one end of the 4th resistance is connected to the inverting input of the first voltage comparator, the 4th resistance it is another
One end is connected to the output end of the first voltage comparator.
7. power overcurrent protection circuit as claimed in claim 4, it is characterised in that the self-lock protection module also includes the 7th
Resistance, the output end of the second voltage comparator is connected to the homophase of the second voltage comparator by the 7th resistance
Input.
8. power overcurrent protection circuit as claimed in claim 7, it is characterised in that the self-lock protection module also includes the 8th
Resistance, the output end of the second voltage comparator is connected to the control end of the switching tube by the 8th resistance, described
The common end grounding of switching tube.
9. the power overcurrent protection circuit as described in claim 4,7 or 8, it is characterised in that the one-way conduction element is two
Pole pipe, the positive pole of the diode is connected to the output end of the first voltage comparator；The negative pole of the diode is connected to
The in-phase input end of the second voltage comparator.
10. power overcurrent protection circuit as claimed in claim 8, it is characterised in that the switching tube is NPN type triode,
Control end, common port, the output end of the switching tube corresponds to respectively base stage, emitter stage, the current collection of the NPN type triode
Pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621047932.2U CN206164074U (en) | 2016-09-09 | 2016-09-09 | Power supply overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621047932.2U CN206164074U (en) | 2016-09-09 | 2016-09-09 | Power supply overcurrent protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206164074U true CN206164074U (en) | 2017-05-10 |
Family
ID=58651903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621047932.2U Active CN206164074U (en) | 2016-09-09 | 2016-09-09 | Power supply overcurrent protection circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342744A (en) * | 2017-06-29 | 2017-11-10 | 成都旭光光电技术有限责任公司 | A kind of electric charge release circuit and ultraviolet light detection module for ultraviolet phototube |
| CN110752580A (en) * | 2018-07-23 | 2020-02-04 | 中国科学院沈阳自动化研究所 | Connection box power supply system and method for submarine observation network |
| CN110797856A (en) * | 2019-10-15 | 2020-02-14 | 唐博汶 | Power supply device control method and power supply device |
| CN111342423A (en) * | 2020-04-07 | 2020-06-26 | 京东方科技集团股份有限公司 | Power supply hardware self-locking protection circuit |
| CN111856125A (en) * | 2020-08-06 | 2020-10-30 | 汉纳森（厦门）数据股份有限公司 | Vehicle and large current control circuit of vehicle |
| CN112986803A (en) * | 2021-03-15 | 2021-06-18 | 深圳慧能泰半导体科技有限公司 | Fault detection circuit and method, power adapter and electronic equipment |
| CN116742571A (en) * | 2023-08-16 | 2023-09-12 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
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2016
- 2016-09-09 CN CN201621047932.2U patent/CN206164074U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342744A (en) * | 2017-06-29 | 2017-11-10 | 成都旭光光电技术有限责任公司 | A kind of electric charge release circuit and ultraviolet light detection module for ultraviolet phototube |
| CN107342744B (en) * | 2017-06-29 | 2023-08-15 | 成都紫外光电技术有限公司 | Charge release circuit for ultraviolet phototube and ultraviolet light detection module |
| CN110752580A (en) * | 2018-07-23 | 2020-02-04 | 中国科学院沈阳自动化研究所 | Connection box power supply system and method for submarine observation network |
| CN110797856A (en) * | 2019-10-15 | 2020-02-14 | 唐博汶 | Power supply device control method and power supply device |
| CN111342423A (en) * | 2020-04-07 | 2020-06-26 | 京东方科技集团股份有限公司 | Power supply hardware self-locking protection circuit |
| CN111342423B (en) * | 2020-04-07 | 2023-03-03 | 京东方科技集团股份有限公司 | Power supply hardware self-locking protection circuit |
| CN111856125A (en) * | 2020-08-06 | 2020-10-30 | 汉纳森（厦门）数据股份有限公司 | Vehicle and large current control circuit of vehicle |
| CN112986803A (en) * | 2021-03-15 | 2021-06-18 | 深圳慧能泰半导体科技有限公司 | Fault detection circuit and method, power adapter and electronic equipment |
| CN116742571A (en) * | 2023-08-16 | 2023-09-12 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
| CN116742571B (en) * | 2023-08-16 | 2023-11-21 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
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