CN202978213U - Power supply overvoltage protection circuit - Google Patents
Power supply overvoltage protection circuit Download PDFInfo
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- CN202978213U CN202978213U CN 201220657625 CN201220657625U CN202978213U CN 202978213 U CN202978213 U CN 202978213U CN 201220657625 CN201220657625 CN 201220657625 CN 201220657625 U CN201220657625 U CN 201220657625U CN 202978213 U CN202978213 U CN 202978213U
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- voltage
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- effect transistor
- field effect
- overvoltage
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Abstract
The utility model relates to a power supply overvoltage protection circuit. The power supply overvoltage protection circuit comprises an overvoltage check circuit and further comprises a field-effect tube Q1 and a clamping circuit, wherein a grid electrode of the field-effect tube Q1 is in grounding connection through a resistor R1 and a resistor R2 which are connected in series, a drain electrode of the field-effect tube Q1 is connected with a controller, an output end of the overvoltage check circuit is connected between the resistor R1 and the resistor R2, an input put end of the overvoltage check circuit is connected with a source electrode of the field-effect tube Q1, an input end of the clamping circuit is connected with the source electrode of the field-effect tube Q1, and an output end of the clamping circuit is connected with an output end of the overvoltage check circuit. When voltage of the source electrode of the field-effect tube Q1 is smaller than a set value, the overvoltage check circuit has no output voltage, and output voltage of the drain electrode of the field-effect tube Q1 is equal to or similar to voltage of the source electrode; when the voltage of the source electrode of the field-effect tube Q1 is greater than the set value, voltage at the output end of the overvoltage check circuit is equal to or similar to voltage of the source electrode, and output of the drain electrode of the field-effect tube Q1 is cut off, and output voltage is zero. The power supply overvoltage protection circuit has advantages of simple structure, reliable performance, low cost and wide application scope.
Description
Technical field
The utility model relates to the control circuit in engineering machinery field, has related in particular to a kind of power supply overvoltage protection circuit.
Background technology
The power supply of engineering machinery is provided by storage battery and generator usually, fluctuation due to engine loading, and the fault of the circuit bad connection that may exist, cause the overpressure situation of system power supply to happen occasionally, when serious such as the situation of throw load occur, can puncture TVS or other power supply chips, usually use the mode of TVS in parallel or increase current-limiting resistance to solve, but such settling mode can increase a lot of costs or PCB area of dissipation, causes unnecessary energy waste.
Summary of the invention
The purpose of this utility model is for deficiency of the prior art, provides that a kind of cost is low, dependable performance, power supply overvoltage protection circuit applied widely.
To achieve these goals, the utility model has adopted following technical scheme: a kind of power supply overvoltage protection circuit, comprise the overvoltage check circuit, and wherein, also comprise field effect transistor Q
1, clamp circuit, described field effect transistor Q
1Grid through the serial connection resistance R
1And resistance R
2Ground connection, field effect transistor Q
1Drain electrode is power output end; The voltage output end of described overvoltage check circuit is connected in resistance R
1And resistance R
2Between, the voltage input end of overvoltage check circuit and field effect transistor Q
1Source electrode connect, the output of described clamp circuit and field effect transistor Q
1Source electrode connect, the input of clamp circuit is connected with the voltage output end of overvoltage check circuit, as field effect transistor Q
1The output Non voltage output of source voltage overvoltage check circuit during lower than set point, field effect transistor Q
1The drain electrode output voltage equal or near source voltage; And as field effect transistor Q
1The voltage of source voltage voltage output end of overvoltage check circuit during higher than set point equal or near source voltage, field effect transistor Q
1Drain electrode output turn-off, output voltage equals or approaches zero.
Described clamp circuit is by voltage stabilizing didoe D
2Consist of its negative electrode and field effect transistor Q
1Source electrode connect, anode is connected with the voltage output end of overvoltage check circuit.
Described field effect transistor Q
1Be the P channel MOS tube; The P channel MOS tube is namely P raceway groove isolated gate FET.
Power supply overvoltage protection circuit also comprises reverse-connection preventing circuit, the output of reverse-connection preventing circuit and field effect transistor Q
1Source electrode connect, input is power connector end.
Described reverse-connection preventing circuit is by diode D
1Consist of diode D
1Negative electrode and described field effect transistor Q
1Source electrode connect.
Power supply overvoltage protection circuit also comprises Transient Suppression Diode D
3, described Transient Suppression Diode D
3Negative electrode and field effect transistor Q
1Drain electrode connect, Transient Suppression Diode D
3Plus earth.
The clamp voltage of described clamp circuit satisfies field effect transistor Q
1Input voltage Vgs.
During higher than set point, output signal is controlled field effect transistor Q to described overvoltage check circuit at supply voltage
1Close.
Adopt circuit of the present utility model, controller both can be worked under the normal supply voltage of system, also can be when system voltage be too high the automatic cutting controller power supply, avoid high pressure to damage the components and parts of controller inside.
The utility model by reverse-connection preventing circuit directly and power supply be connected in series, during normal operating conditions, clamp circuit work when supply voltage is too high, is closed field effect transistor Q by overvoltage check circuit output signal
1Output, thereby the components and parts such as protection controller internal electric source chip are not damaged by high pressure.
The effect of clamp circuit is that the top of periodically variable waveform or bottom are remained on a certain definite DC level.Clamp circuit is common diode clamping circuit.The clamping action of diode refers to utilize the diode forward conduction voltage drop relatively stable, and the characteristics of numerical value less (sometimes can be approximately zero), comes the current potential of certain point in limiting circuit.
Transient Suppression Diode (Transient Voltage Suppressor) is called for short TVS, is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS diode are subject to reverse transient state high energy impact events; it can be with 10 the speed of bearing 12 power second-times; the high impedance of its two interpolar is become Low ESR; the surge power of absorption up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value; effectively protect the precision components in electronic circuit, avoid the damage of various surge pulses.Due to it has that the response time is fast, transient power is large, leakage current is low, puncture voltage deviation, clamp voltage are more easy to control, without damaging the advantages such as the limit, volume are little, the overvoltage that can effectively cause manual operation mistakes such as thunder and lightning, load switches is impacted and is shielded.
The beneficial effects of the utility model:
Circuit structure is simple, dependable performance, cost are low, applied widely.Field effect transistor Q
1, clamp circuit and overvoltage check circuit be used in conjunction with together, can work under the normal voltage of system, also can be when system voltage be too high the power supply of automatic cutting controller, the protection controller internal component.
Description of drawings
Fig. 1 is the circuit diagram of the utility model one embodiment.
Reference numeral: 1-power supply, 2-reverse-connection preventing circuit, 3-field effect transistor Q
1, 4-controller, 5-clamp circuit, 6-overvoltage check circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Embodiment 1:
As shown in drawings, a power supply overvoltage protection circuit comprises reverse-connection preventing circuit 2, field effect transistor Q
13, clamp circuit 5 and overvoltage check circuit 6; Described field effect transistor Q
13 grid is through the resistance R of serial connection
1And resistance R
2Ground connection, draining is power output end; The voltage output end of described overvoltage check circuit 6 is connected in resistance R
1And resistance R
2Between, the voltage input end of overvoltage check circuit 6 and field effect transistor Q
13 source electrode connects; The output of described clamp circuit 5 and field effect transistor Q
13 source electrode connects, and the input of clamp circuit 5 is connected with the voltage output end of overvoltage check circuit 6; As field effect transistor Q
1The output Non voltage output of 3 source voltage overvoltage check circuit 6 during lower than set point, effect pipe Q
13 drain electrode output voltage equals or near source voltage; As field effect transistor Q
1The voltage of 3 source voltage voltage output end of overvoltage check circuit 6 during higher than set point equals or near source voltage, effect pipe Q
13 drain electrode output is turn-offed, and output voltage equals or approaches zero; Described clamp circuit 5 is by voltage stabilizing didoe D
2Consist of its negative electrode and field effect transistor Q
13 source electrode connects, and anode is connected with the voltage output end of overvoltage check circuit 6; Described field effect transistor Q
13 is the P channel MOS tube; The output of described reverse-connection preventing circuit 2 and described field effect transistor Q
13 source electrode connects, and input is connected with power supply 1; Reverse-connection preventing circuit 2 is by diode D
1Consist of diode D
1Negative electrode and described field effect transistor Q
13 source electrode connects; This power supply overvoltage protection circuit also comprises Transient Suppression Diode D
3, Transient Suppression Diode D
3Negative electrode and field effect transistor Q
13 drain electrode connects, Transient Suppression Diode D
3Plus earth.
Embodiment 2:
A kind of power supply overvoltage protection circuit comprises overvoltage check circuit 6, field effect transistor Q
13 and clamp circuit 5, described field effect transistor Q
13 grid is through the resistance R of serial connection
1And resistance R
2Ground connection, field effect transistor Q
13 drain electrode is connected with controller 4; The voltage output end of described overvoltage check circuit 6 is connected in resistance R
1And resistance R
2Between, the voltage input end of overvoltage check circuit 6 and field effect transistor Q
13 source electrode connects, the output of described clamp circuit 5 and field effect transistor Q
13 source electrode connects, and the input of clamp circuit 5 is connected with the voltage output end of overvoltage check circuit 6; As field effect transistor Q
1The output Non voltage output of 3 source voltage overvoltage check circuit 6 during lower than set point, effect pipe Q
13 drain electrode output voltage equals or near source voltage; As field effect transistor Q
1The voltage of 3 source voltage voltage output end of overvoltage check circuit 6 during higher than set point equals or near source voltage, effect pipe Q
13 drain electrode output is turn-offed, and output voltage equals or approaches zero; Described clamp circuit 5 is by voltage stabilizing didoe D
2Consist of its negative electrode and field effect transistor Q
13 source electrode connects, and anode is connected with the voltage output end of overvoltage check circuit 6; Described field effect transistor Q
13 is the P channel MOS tube.
Embodiment 3:
The difference of the present embodiment and embodiment 2 is: this power supply overvoltage protection circuit also comprises Transient Suppression Diode D
3, described Transient Suppression Diode D
3Negative electrode and field effect transistor Q
13 drain electrode connects, Transient Suppression Diode D
3Plus earth.
Embodiment 4:
The difference of the present embodiment and embodiment 2 is: this power supply overvoltage protection circuit also comprises reverse-connection preventing circuit 2, the output of described reverse-connection preventing circuit 2 and described field effect transistor Q
13 source electrode connects, and input is connected with power supply 1; Described reverse-connection preventing circuit 2 is by diode D
1Consist of diode D
1Negative electrode and described field effect transistor Q
13 source electrode connects.
Claims (6)
1. a power supply overvoltage protection circuit, comprise overvoltage check circuit (6), it is characterized in that: also comprise field effect transistor Q
1(3), clamp circuit (5), described field effect transistor Q
1(3) grid is through the resistance R of serial connection
1And resistance R
2Ground connection, field effect transistor Q
1(3) drain electrode is power output end; The voltage output end of described overvoltage check circuit (6) is connected in resistance R
1And resistance R
2Between, the voltage input end of overvoltage check circuit (6) and field effect transistor Q
1(3) source electrode connects, the output of described clamp circuit (5) and field effect transistor Q
1(3) source electrode connects, and the input of clamp circuit (5) is connected with the voltage output end of overvoltage check circuit (6), as field effect transistor Q
1The output Non voltage output of the overvoltage check circuit (6) during lower than set point of source voltage (3), effect pipe Q
1(3) drain electrode output voltage equals or near source voltage; As field effect transistor Q
1The voltage of the voltage output end of overvoltage check circuit (6) during higher than set point of source voltage (3) is increased to and equals or near source voltage, effect pipe Q
1(3) drain electrode output is turn-offed, and output voltage equals or approaches zero.
2. power supply overvoltage protection circuit according to claim 1, it is characterized in that: described clamp circuit (5) is by voltage stabilizing didoe D
2Consist of its negative electrode and field effect transistor Q
1(3) source electrode connects, and anode is connected with the voltage output end of overvoltage check circuit (6).
3. the described power supply overvoltage protection circuit of any one according to claim 1 and 2, is characterized in that: described field effect transistor Q
1(3) be the P channel MOS tube.
4. power supply overvoltage protection circuit according to claim 3, is characterized in that: also comprise reverse-connection preventing circuit (2), the output of described reverse-connection preventing circuit (2) and described field effect transistor Q
1(3) source electrode connects, and input is power connector end.
5. power supply overvoltage protection circuit according to claim 4, it is characterized in that: described reverse-connection preventing circuit (2) is by diode D
1Consist of the negative electrode of diode D1 and described field effect transistor Q
1(3) source electrode connects.
6. the described power supply overvoltage protection circuit of any one according to claim 1 and 2, is characterized in that: also comprise Transient Suppression Diode D
3, described Transient Suppression Diode D
3Negative electrode and field effect transistor Q
1(3) drain electrode connects, Transient Suppression Diode D
3Plus earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220657625 CN202978213U (en) | 2012-12-03 | 2012-12-03 | Power supply overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220657625 CN202978213U (en) | 2012-12-03 | 2012-12-03 | Power supply overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978213U true CN202978213U (en) | 2013-06-05 |
Family
ID=48519240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220657625 Expired - Fee Related CN202978213U (en) | 2012-12-03 | 2012-12-03 | Power supply overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978213U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485643A (en) * | 2014-11-26 | 2015-04-01 | 四川天启智源科技有限公司 | Intelligent building control device |
| CN108058662A (en) * | 2018-01-02 | 2018-05-22 | 中国第汽车股份有限公司 | Vehicle-mounted 24V systems throw load transient overvoltage protects circuit |
| CN109075560A (en) * | 2016-04-22 | 2018-12-21 | 雷诺股份公司 | Protection to vehicle power supply source |
| CN109995001A (en) * | 2018-01-02 | 2019-07-09 | 通用电气公司 | For protecting protection circuit and the guard method of controllable switch |
| CN111244925A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Power supply protection circuit and electric control equipment |
-
2012
- 2012-12-03 CN CN 201220657625 patent/CN202978213U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485643A (en) * | 2014-11-26 | 2015-04-01 | 四川天启智源科技有限公司 | Intelligent building control device |
| CN109075560A (en) * | 2016-04-22 | 2018-12-21 | 雷诺股份公司 | Protection to vehicle power supply source |
| CN108058662A (en) * | 2018-01-02 | 2018-05-22 | 中国第汽车股份有限公司 | Vehicle-mounted 24V systems throw load transient overvoltage protects circuit |
| CN109995001A (en) * | 2018-01-02 | 2019-07-09 | 通用电气公司 | For protecting protection circuit and the guard method of controllable switch |
| CN108058662B (en) * | 2018-01-02 | 2023-12-08 | 中国第一汽车股份有限公司 | Load-throwing transient overvoltage protection circuit of vehicle-mounted 24V system |
| CN111244925A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Power supply protection circuit and electric control equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20181203 |