CN206595713U - A kind of surge protection circuit - Google Patents
A kind of surge protection circuit Download PDFInfo
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- CN206595713U CN206595713U CN201720307309.4U CN201720307309U CN206595713U CN 206595713 U CN206595713 U CN 206595713U CN 201720307309 U CN201720307309 U CN 201720307309U CN 206595713 U CN206595713 U CN 206595713U
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Abstract
The utility model discloses a kind of surge protection circuit, including input block and output unit, the surge protection circuit also includes the shut-off unit for being used to control output, the input block is connected with shut-off unit, the shut-off unit is connected with output unit, the shut-off unit includes triode Q1, FET U2, voltage-stabiliser tube D2 and resistance R1, the emitter stage of the triode Q1 is connected to the positive pole of input block, the base stage of the triode Q1 is connected to voltage-stabiliser tube D2 negative electrode, the anode of the voltage-stabiliser tube D2 is connected to resistance R1 one end, the other end of the R1 is connected to the negative pole of input block, the colelctor electrode of the triode Q1 is connected to FET U2 grid, the drain electrode of the FET U2 is connected to the positive pole of input block, the source electrode of the FET U2 is connected to the positive pole of output unit.The utility model surge protection circuit protective value is good, fast response time, circuit structure are simple, cost is low.
Description
Technical field
The utility model is related to power technique fields, more particularly to a kind of surge protection circuit.
Background technology
Often there is the phenomenon burnt out in charging or slotting charger in mobile phone, electronic product etc., this phenomenon occur
The reason for be exactly that the moment for inserting charger in mobile phone can produce very big surge voltage and surge current, moment will be by mobile phone
Puncture, in some backward areas, power failure phenomenon often occur, if the straight cutting of mobile phone one charging, have a power failure, send a telegram here moment, civil power
Very big surge voltage can be produced by charger to mobile phone, directly mobile phone is burnt out.Therefore in order to avoid this phenomenon occurs,
Mobile phone, electronic product etc. are necessary to prevent such thing from occurring, and to prevent such surge problem, it is necessary in mobile phone, electronics
Increase over-voltage protecting function on the charge path of product, a surge protection circuit is set, be higher than when charge path produces one
When required voltage, it will surge protection circuit automatically cuts off charging circuit, prevent from damaging mobile phone, electronic product etc..
The method of traditional suppression surge current is the heat that suitable negative temperature coefficient is sealed in the loop of rectification circuit
Quick first resistor (NTC), its resistance is larger under normal conditions for temperature-sensitive first resistor, and power switch connects moment, temperature-sensitive first resistor
Resistance is larger, limits the charging current to electric capacity, so as to inhibit surge current, temperature-sensitive first resistor is due to heating, and it hinders
Value is reduced because of heating, to reduce the influence of first resistor oneself power consumption and reduction to circuit efficiency.This method simple possible,
If but short supply interruption, because temperature-sensitive first resistor cool time is longer, when temperature-sensitive first resistor is uncolled, if power switch is again
Secondary connection or circuit are re-powered, and the surge at this moment produced can be very big, and the protective effect of temperature-sensitive first resistor can decline, or even complete
It is complete ineffective, do not have good protective effect.Temperature-sensitive first resistor seals in circuit loop and can produced during circuit normal work
Very lossy, lowers power-efficient, and be not suitable for device for suppression of continuous pulse.Although there is many producers to have been developed at present
Chip, it is only necessary to which this chip, which is serially connected on charging circuit, can just realize above-mentioned over-voltage protecting function, but such core
Cost that piece is designed is high, the low-response of overvoltage protection, easily chip is burnt out once surge voltage is excessive, opponent is mechanical, electrical
Sub- product etc. does not have the effect reliably protected.
Utility model content
The purpose of this utility model be overcome weak point of the prior art there is provided a kind of protective value it is good, response speed
Degree is fast, the surge protection circuit that circuit structure is simple, cost is low.
In order to solve the above technical problems, the utility model is solved by following technical proposals：
A kind of surge protection circuit, including input block and output unit, the surge protection circuit also include being used to control
The shut-off unit of output is made, the input block is connected with shut-off unit, the shut-off unit is connected with output unit, described to close
Disconnected unit includes triode Q1, FET U2, voltage-stabiliser tube D2 and resistance R1, and the emitter stage of the triode Q1 is connected to input
The positive pole of unit, the base stage of the triode Q1 is connected to voltage-stabiliser tube D2 negative electrode, and the anode of the voltage-stabiliser tube D2 is connected to electricity
R1 one end is hindered, the other end of the R1 is connected to the negative pole of input block, and the colelctor electrode of the triode Q1 is connected to field effect
Should pipe U2 grid, the drain electrode of the FET U2 is connected to the positive pole of input block, and the source electrode of the FET U2 connects
It is connected to the positive pole of output unit.
Specifically, the shut-off unit also includes：Surge TVS pipe D1 and electric capacity C1, the surge TVS pipe D1 negative electrode connect
The positive pole of input block is connected to, the anode of the surge TVS pipe D1 is connected to the negative pole of input block, one end of the electric capacity C1
The positive pole of input block is connected to, the other end of the electric capacity C1 is connected to the negative pole of input block.
Specifically, the shut-off unit also includes：Electric capacity C2, electric capacity C3, electric capacity C4, resistance R2 and resistance R3, it is described
Electric capacity C2 one end is connected to triode Q1 base stage, and the electric capacity C2 other ends are connected to the negative pole of input block, the electric capacity
C3 one end is connected to triode Q1 emitter stage, and the electric capacity C3 other ends are connected to triode Q1 colelctor electrode, the resistance
R2 one end is connected to the positive pole of input block, and the other end of the resistance R2 is connected to resistance R3 one end, the resistance R3's
The other end is connected to the negative pole of input block, and described electric capacity C4 one end is connected to the positive pole of output unit, and the electric capacity C4's is another
One end is connected to the negative pole of output unit.
The utility model has advantages below and beneficial effect compared with prior art：A kind of surge protection electricity of the utility model
Road is by using shut-off unit, conducting and cutoff function using triode Q1 and FET U2, when input block surge electricity
When pressure reaches voltage-stabiliser tube D2 overvoltage protection thresholds, voltage-stabiliser tube D2 punctures, triode Q1 conductings, and its current collection limit position is high potential,
FET U2 ends, it is impossible to which output HIGH voltage is acted on well, while this reality to output unit so as to serve surge protection performance
With novel surge protective circuit structure is simple, cost is low.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of schematic diagram of surge protection circuit of the utility model.
Fig. 2 is the input block of the utility model surge protection circuit and the voltage waveform of output unit.
Embodiment
The utility model is described in further detail with reference to embodiment and accompanying drawing, but implementation of the present utility model
Mode not limited to this.
As shown in figure 1, specific implementation process of the present utility model is as follows：A kind of surge protection circuit, including input block
And output unit, the surge protection circuit is also including the shut-off unit for being used to control output, and the input block is single with turning off
Member connection, the shut-off unit is connected with output unit, and the shut-off unit includes triode Q1, FET U2, voltage-stabiliser tube
D2 and resistance R1, the triode Q1 emitter stage are connected to the positive pole of input block, and the base stage of the triode Q1 is connected to
Voltage-stabiliser tube D2 negative electrode, the anode of the voltage-stabiliser tube D2 is connected to resistance R1 one end, and the other end of the R1 is connected to input
The negative pole of unit, the colelctor electrode of the triode Q1 is connected to FET U2 grid, and the drain electrode of the FET U2 connects
The positive pole of input block is connected to, the source electrode of the FET U2 is connected to the positive pole of output unit.The shut-off unit is also wrapped
Include：Surge TVS pipe D1 and electric capacity C1, wherein surge TVS pipe D1 play surge protective effect, when input block voltage is excessive, wave
Gush TVS pipe D1 and puncture conducting, constitute loop.The negative electrode of the surge TVS pipe D1 is connected to the positive pole of input block, the surge
TVS pipe D1 anode is connected to the negative pole of input block, and one end of the electric capacity C1 is connected to the positive pole of input block, the electricity
The other end for holding C1 is connected to the negative pole of input block.The shut-off unit also includes：Electric capacity C2, electric capacity C3, electric capacity C4, resistance
R2 and resistance R3, described electric capacity C2 one end is connected to triode Q1 base stage, and it is single that the electric capacity C2 other ends are connected to input
The negative pole of member, described electric capacity C3 one end is connected to triode Q1 emitter stage, and the electric capacity C3 other ends are connected to triode Q1
Colelctor electrode, described resistance R2 one end is connected to the positive pole of input block, and the other end of the resistance R2 is connected to resistance R3's
One end, the other end of the resistance R3 is connected to the negative pole of input block, and described electric capacity C4 one end is being connected to output unit just
Pole, the other end of the electric capacity C4 is connected to the negative pole of output unit.
A kind of operation principle of surge protection circuit of the utility model is：When normal voltage 5V is inputted, at voltage-stabiliser tube D2
In off-state, will not voltage stabilizing conducting, triode Q1 disconnects, and FET U2 grid is low level, so Ug<Us, field effect
Should pipe U2 it is in the conduction state, export stable voltage；When input block positive pole surge voltage is too high, voltage-stabiliser tube D2 mistakes are reached
During voltage protection threshold value, D2 punctures, equivalent to short circuit, and triode Q1 transmitting extremely voltage is high level, and triode Q1 is turned on,
Input is charged by triode Q1 to storage capacitor C2, and triode Q1 collector voltages are high potential, so that FET U2
Grid be high potential, Ug=Us, i.e. Ugs=0V, FET U2 cut-off, now by C4 discharge output voltage to output unit
The normal voltage stablized.
Experiments verify that, as shown in Fig. 2 CH1 is the voltage wave of the utility model surge protection circuit input block in figure
Shape, CH2 is the voltage waveform of the utility model surge protection circuit output unit, and abscissa is the time, and ordinate is magnitude of voltage.
Waveform can be seen that after surge protection circuit from figure, and CH1 waveform high voltages become the low-voltage in CH2 waveforms, also
Can significantly find out, the speed of response is very fast, so as to protect the mobile phone after output unit, electronic product, prevent mobile phone,
The possibility that electronic product is damaged.
Above-described embodiment is the utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned
The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, are included within protection domain of the present utility model.
Claims (3)
1. a kind of surge protection circuit, including input block and output unit, it is characterised in that the surge protection circuit is also wrapped
The shut-off unit for controlling output is included, the input block is connected with shut-off unit, and the shut-off unit connects with output unit
Connect, the shut-off unit includes triode Q1, FET U2, voltage-stabiliser tube D2 and resistance R1, the emitter stage of the triode Q1
The positive pole of input block is connected to, the base stage of the triode Q1 is connected to voltage-stabiliser tube D2 negative electrode, the sun of the voltage-stabiliser tube D2
Pole is connected to resistance R1 one end, and the other end of the R1 is connected to the negative pole of input block, the colelctor electrode of the triode Q1
FET U2 grid is connected to, the drain electrode of the FET U2 is connected to the positive pole of input block, the FET
U2 source electrode is connected to the positive pole of output unit.
2. a kind of surge protection circuit according to claim 1, it is characterised in that the shut-off unit also includes：Surge
TVS pipe D1 and electric capacity C1, the surge TVS pipe D1 negative electrode are connected to the positive pole of input block, the sun of the surge TVS pipe D1
Pole is connected to the negative pole of input block, and one end of the electric capacity C1 is connected to the positive pole of input block, and the electric capacity C1's is another
End is connected to the negative pole of input block.
3. a kind of surge protection circuit according to claim 1, it is characterised in that the shut-off unit also includes：Electric capacity
C2, electric capacity C3, electric capacity C4, resistance R2 and resistance R3, described electric capacity C2 one end is connected to triode Q1 base stage, the electric capacity
The C2 other ends are connected to the negative pole of input block, and described electric capacity C3 one end is connected to triode Q1 emitter stage, the electric capacity C3
The other end is connected to triode Q1 colelctor electrode, and described resistance R2 one end is connected to the positive pole of input block, the resistance R2's
The other end is connected to resistance R3 one end, and the other end of the resistance R3 is connected to the negative pole of input block, the electric capacity C4 mono-
End is connected to the positive pole of output unit, and the other end of the electric capacity C4 is connected to the negative pole of output unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720307309.4U CN206595713U (en) | 2017-03-28 | 2017-03-28 | A kind of surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720307309.4U CN206595713U (en) | 2017-03-28 | 2017-03-28 | A kind of surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206595713U true CN206595713U (en) | 2017-10-27 |
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ID=60121657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720307309.4U Active CN206595713U (en) | 2017-03-28 | 2017-03-28 | A kind of surge protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN206595713U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879643A (en) * | 2018-09-14 | 2018-11-23 | 吴凯 | Controller excess voltage protection and method |
| CN110611301A (en) * | 2018-06-15 | 2019-12-24 | 华为技术有限公司 | Protection device, protection circuit and terminal equipment |
| CN117239673A (en) * | 2023-11-13 | 2023-12-15 | 万帮数字能源股份有限公司 | Hiccup type protection circuit equipment and method |
-
2017
- 2017-03-28 CN CN201720307309.4U patent/CN206595713U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611301A (en) * | 2018-06-15 | 2019-12-24 | 华为技术有限公司 | Protection device, protection circuit and terminal equipment |
| CN108879643A (en) * | 2018-09-14 | 2018-11-23 | 吴凯 | Controller excess voltage protection and method |
| CN117239673A (en) * | 2023-11-13 | 2023-12-15 | 万帮数字能源股份有限公司 | Hiccup type protection circuit equipment and method |
| CN117239673B (en) * | 2023-11-13 | 2024-03-22 | 万帮数字能源股份有限公司 | Hiccup type protection circuit equipment and method |
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