CN203205829U - Power source overvoltage protecting circuit - Google Patents
Power source overvoltage protecting circuit Download PDFInfo
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- CN203205829U CN203205829U CN 201320177141 CN201320177141U CN203205829U CN 203205829 U CN203205829 U CN 203205829U CN 201320177141 CN201320177141 CN 201320177141 CN 201320177141 U CN201320177141 U CN 201320177141U CN 203205829 U CN203205829 U CN 203205829U
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- circuit
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- voltage stabilizing
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Abstract
The utility model relates to a power source overvoltage protecting circuit comprising a voltage stabilization control circuit and a voltage monitoring circuit. The voltage stabilization control circuit reduces the voltage by capacitors, and provides a stable power source for a control output circuit by a full-wave rectification circuit and a voltage stabilizing circuit. The voltage monitoring circuit provides a reference voltage signal for the control output circuit by monitoring voltage values of an input power source. The power source overvoltage protecting circuit provided by the utility model enables a household power source to be cut off when the voltage of the household power source is too high, so that household appliances are prevented from being damaged in time.
Description
Technical field
The utility model relates to electronic technology field, concrete relates to a kind of power supply overvoltage protection circuit.
Background technology
At present, the mains lighting supply of family expenses and Domestic electric appliances power source all are the 220V AC power, overtension and excessively low situation in use occur sometimes, during brownout, affect the normal use of household electrical appliance, but generally can not cause the damage of household electrical appliance.If overtension can shorten greatly with regard to life-span of household electrical appliance, just might damage household electrical appliance when serious.The neutral line break of sometimes outside line, the alternating current of 380V will got lines crossed, and the domestic power supply voltage of 220V will be elevated to 380V, directly burns household electrical appliance.When situation is serious, also can initiation fire, cause direct economic loss for people's house and property, even jeopardize people's life security.
Summary of the invention
According to above-mentioned situation, the purpose of this utility model provides a kind of protective circuit with overvoltage automatic protection functions, can directly cut off domestic power supply when the domestic power supply overtension, in time protects household electrical appliance not to be damaged.
The technical solution of the utility model is as follows: a kind of power supply overvoltage protection circuit is made of controlling circuit of voltage regulation and electric voltage observation circuit:
Controlling circuit of voltage regulation comprises voltage stabilizing triode Q1, control output triode Q2, resistance R 1, R2, R3, R4, capacitor C 1, electrochemical capacitor C2, C3, rectifier diode D1, D2, D3, the full-wave rectifying circuit D that D4 forms, voltage stabilizing didoe D5, relay J, capacitor C 1 and resistance R 1 and connect after be connected between power supply and the full-wave rectifying circuit D, electrochemical capacitor C2 and resistance R 2 are serially connected between the collector electrode of the output of full-wave rectifying circuit and voltage stabilizing triode Q1, the positive pole of electrochemical capacitor C2 connects the base stage of voltage stabilizing triode Q1, the positive pole of voltage stabilizing didoe D5 is connected to the base stage of voltage stabilizing triode Q1, negative pole is connected to the output of rectification circuit, electrochemical capacitor C3 is attempted by between the emitter and rectification circuit of voltage stabilizing triode Q1, relay J is connected to the emitter of voltage stabilizing triode Q1 and controls between the collector electrode of output triode Q2, the normally-closed contact J2 of relay is connected with power supply, resistance R 4 is connected between the base stage and emitter of control output triode Q2, resistance R 3 one ends are connected to the base stage of control output triode Q2, and the other end is connected with the output of electric voltage observation circuit;
Electric voltage observation circuit comprises triode Q3, resistance R 5, R6, R7, R8, electrochemical capacitor C4, rectifier diode D6, voltage stabilizing didoe D7, photoelectrical coupler G, resistance R 5 and rectifier diode D6, resistance R 8 are serially connected between the input of power supply and photoelectrical coupler G, the input of photoelectrical coupler G is connected with the collector electrode of triode Q3, resistance R 6, R7 are connected in series rear and capacitor C 4 is attempted by the negative pole of rectifier diode D6 and the positive pole of voltage stabilizing didoe D7, the negative pole connecting triode Q3 emitter of rectifier diode D7.
Preferably, the input at the power supply overvoltage protection circuit power supply is connected with insurance RD.
Controlling circuit of voltage regulation in the utility model power supply overvoltage protection circuit utilizes capacitance decompression, passes through full-wave rectifying circuit and voltage stabilizing circuit again, for the control output circuit provides a stable power supply.Owing to having used capacity voltage dropping circuit and voltage stabilizing circuit, so that the input supply voltage scope is very wide, supply voltage can not damage self circuit of this device in 220V to 380V scope.Two contacts of control output circuit relay are normally off, electric voltage observation circuit is by the voltage height of monitoring input power, for the control output circuit provides a reference voltage signal, when supply voltage is normal, lower voltage signal of electric voltage observation circuit output is delivered to the control output circuit, the control output circuit is failure to actuate, two holding contact closure states of relay, and the 220V AC power is normally exported.When supply voltage was too high, higher voltage signal of electric voltage observation circuit output was delivered to the control output circuit, control transmission of electricity road action, and two contacts of relay disconnect, and the power supply of overtension disconnects output, in time protects not being damaged of household electrical appliance.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, a kind of power supply overvoltage protection circuit is made of controlling circuit of voltage regulation 1 and electric voltage observation circuit 2:
Controlling circuit of voltage regulation 1 comprises voltage stabilizing triode Q1, control output triode Q2, resistance R 1, R2, R3, R4, capacitor C 1, electrochemical capacitor C2, C3, rectifier diode D1, D2, D3, the full-wave rectifying circuit D that D4 forms, voltage stabilizing didoe D5, relay J, capacitor C 1 and resistance R 1 and connect after be connected between power supply and the full-wave rectifying circuit D, electrochemical capacitor C2 and resistance R 2 are serially connected between the collector electrode of the output of full-wave rectifying circuit and voltage stabilizing triode Q1, the positive pole of electrochemical capacitor C2 connects the base stage of voltage stabilizing triode Q1, the positive pole of voltage stabilizing didoe D5 is connected to the base stage of voltage stabilizing triode Q1, negative pole is connected to the output of rectification circuit, electrochemical capacitor C3 is attempted by between the emitter and rectification circuit of voltage stabilizing triode Q1, relay J is connected to the emitter of voltage stabilizing triode Q1 and controls between the collector electrode of output triode Q2, the normally-closed contact J2 of relay is connected with power supply, resistance R 4 is connected between the base stage and emitter of control output triode Q2, resistance R 3 one ends are connected to the base stage of control output triode Q2, and the other end is connected with the output of electric voltage observation circuit;
Electric voltage observation circuit 2 comprises triode Q3, resistance R 5, R6, R7, R8, electrochemical capacitor C4, rectifier diode D6, voltage stabilizing didoe D7, photoelectrical coupler G, resistance R 5 and rectifier diode D6, resistance R 8 are serially connected between the input of power supply and photoelectrical coupler G, the input of photoelectrical coupler G is connected with the collector electrode of triode Q3, resistance R 6, R7 are connected in series rear and capacitor C 4 is attempted by the negative pole of rectifier diode D6 and the positive pole of voltage stabilizing didoe D7, the negative pole connecting triode Q3 emitter of rectifier diode D7, the input of power supply are connected with insurance RD.
During concrete the use, the 220V AC power of input is divided into Cheng Sanlu, and the first via is passed through the normally-closed contact J12 of relay J to power output end; The second the tunnel by insurance RD, capacitor C 1 and resistance R 1 step-down, diode D1, D2, D3, D4 rectification, triode Q1, resistance R 2, diode D5, capacitor C 2, C3 voltage regulation filtering, deliver to the control output circuit of triode Q2, relay J, resistance R 3, R4 composition, for the control output circuit provides a stable power supply; Third Road is by insurance RD, resistance R 5 step-down current limlitings, and diode D6 rectification, the voltage monitoring sampling amplification circuit that triode Q3, optocoupler G, voltage stabilizing didoe D7, resistance R 6, R7, R8 form is delivered in capacitor C 4 filtering.
When the 220V AC supply voltage of input is normal, in the electric voltage observation circuit through resistance R 5 step-downs, diode D6 rectification, the voltage that forms at C4 after capacitor C 4 filtering is also normal, this normal voltage is delivered to the voltage monitoring sampling amplification circuit of triode Q3, optocoupler G, voltage stabilizing didoe D7, resistance R 6, R7, R8 composition, and the output at optocoupler G after sampling is amplified presents high-impedance state.The positive voltage of controlling circuit of voltage regulation is delivered to triode Q2 base stage after the output of optocoupler G and resistance R 3 voltage is also very little, and deficiency is so that triode Q2 saturation conduction, and two contacts of relay J also keep normally off, and the 220V AC power is normally exported.
When the 220V AC supply voltage of input is elevated to certain value, in the electric voltage observation circuit through resistance R 5 step-downs, diode D6 rectification, the voltage that forms at C4 after capacitor C 4 filtering also is elevated to certain value, this voltage that is elevated to certain value is delivered to the voltage monitoring sampling amplification circuit of triode Q3, optocoupler G, voltage stabilizing didoe D7, resistance R 6, R7, R8 composition, and the output at optocoupler G after sampling is amplified presents relative low resistive state.The positive voltage of controlling circuit of voltage regulation is delivered to triode Q2 base stage after the output of optocoupler and resistance R 3 voltage is the relative certain value that is elevated to also; this base voltage that is elevated to certain value is enough to make triode Q2 saturation conduction; relay J begins adhesive; two normally-closed contacts of relay J disconnect; the 220V AC power disconnects output, in time protects not being damaged of household electrical appliance.
Claims (2)
1. power supply overvoltage protection circuit is characterized in that being made of controlling circuit of voltage regulation and electric voltage observation circuit:
Controlling circuit of voltage regulation comprises voltage stabilizing triode Q1, control output triode Q2, resistance R 1, R2, R3, R4, capacitor C 1, electrochemical capacitor C2, C3, rectifier diode D1, D2, D3, the full-wave rectifying circuit D that D4 forms, voltage stabilizing didoe D5, relay J, capacitor C 1 and resistance R 1 and connect after be connected between power supply and the full-wave rectifying circuit D, electrochemical capacitor C2 and resistance R 2 are serially connected between the collector electrode of the output of full-wave rectifying circuit and voltage stabilizing triode Q1, the positive pole of electrochemical capacitor C2 connects the base stage of voltage stabilizing triode Q1, the positive pole of voltage stabilizing didoe D5 is connected to the base stage of voltage stabilizing triode Q1, negative pole is connected to the output of rectification circuit, electrochemical capacitor C3 is attempted by between the emitter and rectification circuit of voltage stabilizing triode Q1, relay J is connected to the emitter of voltage stabilizing triode Q1 and controls between the collector electrode of output triode Q2, the normally-closed contact J2 of relay is connected with power supply, resistance R 4 is connected between the base stage and emitter of control output triode Q2, resistance R 3 one ends are connected to the base stage of control output triode Q2, and the other end is connected with the output of electric voltage observation circuit;
Electric voltage observation circuit comprises triode Q3, resistance R 5, R6, R7, R8, electrochemical capacitor C4, rectifier diode D6, voltage stabilizing didoe D7, photoelectrical coupler G, resistance R 5 and rectifier diode D6, resistance R 8 are serially connected between the input of power supply and photoelectrical coupler G, the input of photoelectrical coupler G is connected with the collector electrode of triode Q3, resistance R 6, R7 are connected in series rear and capacitor C 4 is attempted by the negative pole of rectifier diode D6 and the positive pole of voltage stabilizing didoe D7, the negative pole connecting triode Q3 emitter of rectifier diode D7.
2. power supply overvoltage protection circuit according to claim 1 is characterized in that being connected with insurance RD at the input of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177141 CN203205829U (en) | 2013-04-10 | 2013-04-10 | Power source overvoltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177141 CN203205829U (en) | 2013-04-10 | 2013-04-10 | Power source overvoltage protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203205829U true CN203205829U (en) | 2013-09-18 |
Family
ID=49149897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320177141 Expired - Fee Related CN203205829U (en) | 2013-04-10 | 2013-04-10 | Power source overvoltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203205829U (en) |
-
2013
- 2013-04-10 CN CN 201320177141 patent/CN203205829U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WEI BINPENG JINCHENG POWER SUPPLY COMPANY, STATE G Effective date: 20131204 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: WEI BINPENG Effective date: 20131204 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 048100 JINCHENG, SHAANXI PROVINCE TO: 100031 DONGCHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131204 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Wei Binpeng Patentee after: Jincheng Power Supply Company, State Grid Shanxi Electric Power Company Address before: 048100, Shanxi City, Jincheng province Yangcheng County town run Village Patentee before: Wei Binpeng |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20180410 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |