CN207542770U - A kind of DC over-voltage protection circuit and the power grid power supply voltage-stabilized power supply circuit for including it - Google Patents
A kind of DC over-voltage protection circuit and the power grid power supply voltage-stabilized power supply circuit for including it Download PDFInfo
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- CN207542770U CN207542770U CN201721620566.XU CN201721620566U CN207542770U CN 207542770 U CN207542770 U CN 207542770U CN 201721620566 U CN201721620566 U CN 201721620566U CN 207542770 U CN207542770 U CN 207542770U
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Abstract
The utility model discloses a kind of DC over-voltage protection circuit and its power grid power supply voltage-stabilized power supply circuit is included, including reference circuit, diode D1, further include circuit for regulating and controlling, main switch；The circuit input end and diode D1Anode is connected；Diode D1Cathode is connected with the reference circuit, circuit for regulating and controlling, main switch；The reference circuit is connected with circuit for regulating and controlling；The circuit for regulating and controlling is connected with main switch, reference ground；The main switch is connected with circuit output end.The utility model without using traditional relay as on-off switch, therefore significantly increases service life and response speed since circuit main switching device is used by semiconductor switch.This circuit is applied to the input of some electrical equipment or when accessing the input pole of other circuits, this circuit rapid will make a response shutdown output when overvoltage occurs for system, and to protect late-class circuit, circuit will also restore automatically when voltage restores.
Description
Technical field
The utility model is related to technical field of electronic devices, more particularly to a kind of DC over-voltage protection circuit and comprising its
Power grid power supply voltage-stabilized power supply circuit.
Background technology
Usually because its spread of voltage, unusual fluctuations threaten to late-class circuit, so as to need in electric power system
A kind of over-pressure safety device is to protect electrical appliance or late-class circuit.Restore when disconnecting circuit connection voltage reduces when the voltage increases
To reach protection purpose, electricity is taken through Transformer Rectifier especially for the larger electric power system of the voltage fluctuations such as power grid or generator
Electrical equipment or circuit.
It is made of the utility model is related to circuit the discrete component of low cost, switching device uses semiconductor switch, greatly
The big service life that extends increases reliability.
Utility model content
In view of the above-mentioned problems in the prior art, the main purpose of the utility model is that providing a kind of DC over-voltage
It protects circuit and includes its power grid power supply voltage-stabilized power supply circuit, to solve defect in the prior art.
In order to achieve the above object, the utility model employs following technical solution：
A kind of DC over-voltage protection circuit, including reference circuit, diode D1, further include circuit for regulating and controlling, main switch；Institute
State circuit input end and diode D1Anode is connected；Diode D1Cathode and the reference circuit, circuit for regulating and controlling, main switch phase
Even；The reference circuit is connected with circuit for regulating and controlling；The circuit for regulating and controlling is connected with main switch, reference ground；The main switch
It is connected with circuit output end.
Further, the reference circuit is by zener diode D2, capacitance C1, resistance R3, resistance R4Composition；The capacitance C1
First end and diode D1It is connected, second end is connected with circuit for regulating and controlling；The zener diode D2Cathode and diode D1Cathode phase
Even, anode and resistance R3First end is connected；The resistance R3Second end and circuit for regulating and controlling, resistance R4First end is connected；The resistance
R4Second end is connected with circuit for regulating and controlling.
Further, the circuit for regulating and controlling is by triode Q3, triode Q2, resistance R1, resistance R2Composition；The triode Q3
Base stage and resistance R3Second end, resistance R4First end be connected, emitter and resistance R4Second end, capacitance C1Second
End, reference ground are connected, collector and resistance R2Second end, triode Q2Base stage be connected；Resistance R2First end and diode D1
Cathode, resistance R1First end, main switch is connected；Triode Q2Emitter and triode Q3Emitter, resistance R4's
Second end, capacitance C1Second end, reference ground be connected, collector and resistance R1Second end, main switch is connected.
Further, the main switch is P-channel metal-oxide-semiconductor, source electrode and diode D1, capacitance C1First end, voltage stabilizing two
Pole pipe D2Cathode, resistance R2First end, resistance R1First end be connected, drain electrode is connected with circuit output end, grid with it is electric
Hinder R1Second end, triode Q2Collector be connected.
A kind of power grid power supply voltage-stabilized power supply circuit comprising DC over-voltage protection circuit, including transformer T1, capacitance C2, two
Pole pipe D1, diode D2, diode D3, diode D4, DC over-voltage protection circuit；The transformer T1Primary side both ends outside
Meet zero curve, the firewire of alternating current, first end and the diode D of primary side1Cathode, diode D2Anode be connected, second end and two
Pole pipe D3Cathode, diode D4Anode be connected；The diode D2Cathode, diode D4Cathode and capacitance C2First
End, DC over-voltage protection circuit are connected；The diode D1Anode, diode D3Anode and capacitance C2Second end, direct current
Overvoltage crowbar is connected.
Further, the diode D2Cathode, diode D4Cathode and capacitance C2First end, capacitance C1
One end, zener diode D2Cathode, resistance R2First end, resistance R1First end, P-channel metal-oxide-semiconductor source electrode be connected；Institute
State diode D1Anode, diode D3Anode and capacitance C2Second end, capacitance C1Second end, resistance R4Second end,
Triode Q3Emitter, triode Q2Emitter, reference ground is connected.
The utility model has the following advantages that and advantageous effect：
The utility model is since circuit main switching device is used by semiconductor switch, without using traditional relay as logical
It disconnects and closing, therefore significantly increase service life and response speed.By this circuit be applied to some electrical equipment input or
When accessing the input pole of other circuits, when system generation overvoltage, this circuit, which rapid will make a response, turns off output, after protection
Grade circuit, circuit will also restore automatically when voltage restores.
Description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the power supply voltage-stabilized power supply circuit structure diagram of the power grid containing DC over-voltage protection circuit of the utility model.
Specific embodiment
The utility model is further described with specific embodiment below with reference to accompanying drawings.
As shown in Figure 1, 2, a kind of DC over-voltage protection circuit of the utility model, including reference circuit, diode D1, also
Including circuit for regulating and controlling, main switch；The circuit input end and diode D1Anode is connected；Diode D1Cathode and the benchmark
Circuit, circuit for regulating and controlling, main switch are connected；The reference circuit is connected with circuit for regulating and controlling；The circuit for regulating and controlling and main switch,
Reference ground is connected；The main switch is connected with circuit output end.
Further, the reference circuit is by zener diode D2, capacitance C1, resistance R3, resistance R4Composition；The capacitance C1
First end and diode D1It is connected, second end is connected with circuit for regulating and controlling；The zener diode D2Cathode and diode D1Cathode phase
Even, anode and resistance R3First end is connected；The resistance R3Second end and circuit for regulating and controlling, resistance R4First end is connected；The resistance
R4Second end is connected with circuit for regulating and controlling.
Further, the circuit for regulating and controlling is by triode Q3, triode Q2, resistance R1, resistance R2Composition；The triode Q3
Base stage and resistance R3Second end, resistance R4First end be connected, emitter and resistance R4Second end, capacitance C1Second
End, reference ground are connected, collector and resistance R2Second end, triode Q2Base stage be connected；Resistance R2First end and diode D1
Cathode, resistance R1First end, main switch is connected；Triode Q2Emitter and triode Q3Emitter, resistance R4's
Second end, capacitance C1Second end, reference ground be connected, collector and resistance R1Second end, main switch is connected.
Further, the main switch is P-channel metal-oxide-semiconductor, source electrode and diode D1, capacitance C1First end, voltage stabilizing two
Pole pipe D2Cathode, resistance R2First end, resistance R1First end be connected, drain electrode is connected with circuit output end, grid with it is electric
Hinder R1Second end, triode Q2Collector be connected.
When circuit powers on, external dc voltage passes through diode D1Input circuit, if input voltage is less than benchmark electricity
Press then zener diode D2Reversely cut-off, therefore triode Q3Base stage does not have enough voltage to be also switched off, and because of triode Q3Cut-off
Therefore electric current passes through resistance R2Flow into triode Q2Base stage causes triode Q2Conducting, resistance Q2Conducting is so that main switch grid quilt
It drags down, final main switch conducting is load supplying.
The zener diode D if input voltage is more than reference voltage2Reverse-conducting, triode Q3It is also switched on, because of triode
Q3It is connected triode Q2Base stage drags down, triode Q2Cut-off, final main switch cut-off current will be unable to pass through, and be protected with reaching
Eye protection.Circuit is resumed work automatically if when reduction is inputted.
The circuit course of work is entirely adaptive work, is controlled without peripheral signal, and overvoltage protection value is by steady in circuit
Press diode D2It determines, the voltage-stabiliser tube of different model can be used to use different parameters or capacity to obtain desired rotection thresholds
Main switch can meet the requirements of different circuits.
As shown in Fig. 2, a kind of power grid power supply voltage-stabilized power supply circuit comprising DC over-voltage protection circuit of the utility model,
Including transformer T1, capacitance C2, diode D1, diode D2, diode D3, diode D4, DC over-voltage protection circuit；The change
Depressor T1Primary side the external alternating current in both ends zero curve, firewire, the first end of primary side and diode D1Cathode, diode
D2Anode be connected, second end and diode D3Cathode, diode D4Anode be connected；The diode D2Cathode, two poles
Pipe D4Cathode and capacitance C2First end, DC over-voltage protection circuit is connected；The diode D1Anode, diode D3's
Anode and capacitance C2Second end, DC over-voltage protection circuit is connected.
Further, the diode D2Cathode, diode D4Cathode and capacitance C2First end, capacitance C1
One end, zener diode D2Cathode, resistance R2First end, resistance R1First end, P-channel metal-oxide-semiconductor source electrode be connected；Institute
State diode D1Anode, diode D3Anode and capacitance C2Second end, capacitance C1Second end, resistance R4Second end,
Triode Q3Emitter, triode Q2Emitter, reference ground is connected.
Alternating current is first through transformer T1Decompression, diode D1, diode D2, diode D3, diode D4Rectification, capacitance C1Filter
Become direct current after wave, then provide protection circuit by the utility model and then load is finally fed by regulator circuit,
Protection mechanism is, when network voltage because certain reason increases when capacitance C2Both end voltage also increases, if voltage amplitude is more than voltage stabilizing
Diode D2Voltage stabilizing value protection, circuit will immediately turn off main switch to protect the regulator circuit of rear end and load.If voltage
Less than zener diode D2Automatic conducting is continued as the load supplying after circuit output end by main switch during voltage stabilizing value.
It, may be permanent when network voltage big ups and downs since the pressure voltage of general voltage stabilizing IC is usually no more than 40V
Property damage regulator circuit, therefore circuit provided by the utility model is added in before regulator circuit in this case and is necessary.
Finally it should be noted that：Above-described each embodiment be merely to illustrate the technical solution of the utility model rather than
It is limited；Although the utility model is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art
It should be understood that：It can still modify to the technical solution recorded in previous embodiment or to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution the utility model
The range of each embodiment technical solution.
Claims (6)
1. a kind of DC over-voltage protection circuit, including reference circuit, diode D1, it is characterised in that：Further include circuit for regulating and controlling, master
Switching tube；The circuit input end and diode D1Anode is connected；Diode D1Cathode and the reference circuit, circuit for regulating and controlling, master
Switching tube is connected；The reference circuit is connected with circuit for regulating and controlling；The circuit for regulating and controlling is connected with main switch, reference ground；It is described
Main switch is connected with circuit output end.
2. a kind of DC over-voltage protection circuit as described in claim 1, it is characterised in that：The reference circuit is by two pole of voltage stabilizing
Pipe D2, capacitance C1, resistance R3, resistance R4Composition；The capacitance C1First end and diode D1It is connected, second end and circuit for regulating and controlling phase
Even；The zener diode D2Cathode and diode D1Cathode is connected, anode and resistance R3First end is connected；The resistance R3The
Two ends and circuit for regulating and controlling, resistance R4First end is connected；The resistance R4Second end is connected with circuit for regulating and controlling.
3. a kind of DC over-voltage protection circuit as claimed in claim 2, it is characterised in that：The circuit for regulating and controlling is by triode Q3、
Triode Q2, resistance R1, resistance R2Composition；The triode Q3Base stage and resistance R3Second end, resistance R4First end phase
Even, emitter and resistance R4Second end, capacitance C1Second end, reference ground be connected, collector and resistance R2Second end, three poles
Pipe Q2Base stage be connected；Resistance R2First end and diode D1Cathode, resistance R1First end, main switch is connected；Three poles
Pipe Q2Emitter and triode Q3Emitter, resistance R4Second end, capacitance C1Second end, reference ground be connected, collector
With resistance R1Second end, main switch is connected.
4. a kind of DC over-voltage protection circuit as described in claim 1, it is characterised in that：The main switch is P-channel MOS
Pipe, source electrode and diode D1, capacitance C1First end, zener diode D2Cathode, resistance R2First end, resistance R1First end
It is connected, drain electrode is connected with circuit output end, grid and resistance R1Second end, triode Q2Collector be connected.
5. a kind of power grid power supply voltage-stabilized power supply circuit comprising any DC over-voltage protection circuits of claim 1-4,
It is characterized in that：Including transformer T1, capacitance C2, diode D1, diode D2, diode D3, diode D4, DC over-voltage protection electricity
Road；The transformer T1Primary side the external alternating current in both ends zero curve, firewire, the first end of primary side and diode D1The moon
Pole, diode D2Anode be connected, second end and diode D3Cathode, diode D4Anode be connected；The diode D2's
Cathode, diode D4Cathode and capacitance C2First end, DC over-voltage protection circuit is connected；The diode D1Anode, two
Pole pipe D3Anode and capacitance C2Second end, DC over-voltage protection circuit is connected.
The voltage-stabilized power supply circuit 6. power grid as claimed in claim 5 is powered, it is characterised in that：The diode D2Cathode, two poles
Pipe D4Cathode and capacitance C2First end, capacitance C1First end, zener diode D2Cathode, resistance R2First end, electricity
Hinder R1First end, P-channel metal-oxide-semiconductor source electrode be connected；The diode D1Anode, diode D3Anode and capacitance C2's
Second end, capacitance C1Second end, resistance R4Second end, triode Q3Emitter, triode Q2Emitter, reference ground
It is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721620566.XU CN207542770U (en) | 2017-11-29 | 2017-11-29 | A kind of DC over-voltage protection circuit and the power grid power supply voltage-stabilized power supply circuit for including it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721620566.XU CN207542770U (en) | 2017-11-29 | 2017-11-29 | A kind of DC over-voltage protection circuit and the power grid power supply voltage-stabilized power supply circuit for including it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207542770U true CN207542770U (en) | 2018-06-26 |
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ID=62615831
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721620566.XU Expired - Fee Related CN207542770U (en) | 2017-11-29 | 2017-11-29 | A kind of DC over-voltage protection circuit and the power grid power supply voltage-stabilized power supply circuit for including it |
Country Status (1)
| Country | Link |
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| CN (1) | CN207542770U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149964A (en) * | 2018-08-28 | 2019-01-04 | 中国北方发动机研究所(天津) | A kind of alternator for vehicle power rectifier circuit with over-current over-voltage protection function |
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
| CN110401171A (en) * | 2019-08-15 | 2019-11-01 | 福州京东方光电科技有限公司 | A kind of excess voltage protection and its control method, power supply IC, display device |
| CN110416975A (en) * | 2019-07-12 | 2019-11-05 | 深圳市首航通信股份有限公司 | A kind of power protecting circuit and new-energy automobile |
| CN111969710A (en) * | 2020-07-28 | 2020-11-20 | 北京浪潮数据技术有限公司 | Main and standby power supply circuit and storage power supply equipment |
| CN113162011A (en) * | 2021-04-23 | 2021-07-23 | 长城电源技术有限公司 | Overvoltage protection circuit and power supply circuit |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
-
2017
- 2017-11-29 CN CN201721620566.XU patent/CN207542770U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149964A (en) * | 2018-08-28 | 2019-01-04 | 中国北方发动机研究所(天津) | A kind of alternator for vehicle power rectifier circuit with over-current over-voltage protection function |
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
| CN110416975A (en) * | 2019-07-12 | 2019-11-05 | 深圳市首航通信股份有限公司 | A kind of power protecting circuit and new-energy automobile |
| CN110401171A (en) * | 2019-08-15 | 2019-11-01 | 福州京东方光电科技有限公司 | A kind of excess voltage protection and its control method, power supply IC, display device |
| CN111969710A (en) * | 2020-07-28 | 2020-11-20 | 北京浪潮数据技术有限公司 | Main and standby power supply circuit and storage power supply equipment |
| CN113162011A (en) * | 2021-04-23 | 2021-07-23 | 长城电源技术有限公司 | Overvoltage protection circuit and power supply circuit |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
| CN115140008B (en) * | 2022-09-06 | 2022-12-23 | 万向钱潮股份公司 | Vehicle braking system control device |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| 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: 20180626 Termination date: 20181129 |