CN104242234A - Overvoltage protection circuit capable of resetting automatically - Google Patents
Overvoltage protection circuit capable of resetting automatically Download PDFInfo
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- CN104242234A CN104242234A CN201410543958.5A CN201410543958A CN104242234A CN 104242234 A CN104242234 A CN 104242234A CN 201410543958 A CN201410543958 A CN 201410543958A CN 104242234 A CN104242234 A CN 104242234A
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- crystal diode
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- rectification bridge
- phase rectification
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Abstract
The invention relates to an overvoltage protection circuit, and in particular relates to an overvoltage protection circuit capable of resetting automatically, the overvoltage protection circuit comprises a power supply circuit, a triggering circuit and a control circuit, the power supply circuit comprises a single phase rectifier bridge Q, a first resistor R1 and a current stabilization element M, the triggering circuit comprises a second crystal diode VD2, a second resistor R2 and a third resistor R3, the control circuit comprises a bidirectional thyristor U1, a fifth crystal diode VD5 and a sixth crystal diode VD6; two ends of the load are respectively connected to the T2 pole of the bidirectional thyristor U1 and the port 3 of the single phase rectifier bridge Q at the work time, once the alternating current voltage is over high, the voltage of the current stabilization element M is raised for switching on the first unidirectional thyristor T1 and switching off the triode VT1 and the second unidirectional thyristor T2, and the bidirectional thyristor U1 is turned off for protecting the load avoiding the overvoltage damage, the bidirectional thyristor U1 can be immediately turned on while the voltage of the bidirectional thyristor U1 is normal for resetting automatically.
Description
Technical field
The present invention relates to a kind of overvoltage crowbar, being specially one can automatically reset overvoltage crowbar.
Background technology
As everyone knows, present every household has all installed electric protective device, when home circuit breaks down or overload, electric protective device meeting automatic trip is to protect the safety of household electricity, but, existing home-use electric protective device all needs hand-reset, namely manual reset is needed after each tripping operation, suitable trouble, and existing automatically resetting protection circuit is all quite complicated, and manufacture high, cannot promote family, it is simple that the present invention aims to provide a kind of circuit structure, overvoltage crowbar cheap for manufacturing cost, be used in home electrocution protector, greatly facilitate the use of people.
Summary of the invention
The present invention is in order to solve the problem that circuit structure is complicated and cost of manufacture is high of the existing automatically resetting protection circuit for electric protective device, and providing one can automatically reset overvoltage crowbar.
The present invention adopts following technical scheme to realize: one can automatically reset overvoltage crowbar, comprise power circuit, circuits for triggering and control circuit, power circuit comprises single-phase rectification bridge Q, the first resistance R1 and current stabilization element M, circuits for triggering comprise the second crystal diode VD2, the second resistance R2 and the 3rd resistance R3, and control circuit comprises bidirectional thyristor U1, the 5th crystal diode VD5 and the 6th crystal diode VD6;
The first resistance R1 of single-phase rectification bridge Q port 4 by connecting successively, potentiometer RP is connected with single-phase rectification bridge Q port 2 with current stabilization element M, single-phase rectification bridge Q port 2 is connected with single-phase rectification bridge Q port one with the second resistance R2 by the second crystal diode VD2 connected successively, the seven resistance R7 of single-phase rectification bridge Q port one by connecting successively, 8th resistance R8, 4th crystal diode VD4 is connected with single-phase rectification bridge Q port 2 with the second unidirectional thyristor T2, current stabilization element M two ends are also parallel with the first electric capacity C1, second crystal diode VD2 two ends are parallel with the second electric capacity C2, second electric capacity C2 two ends are parallel with the branch road that the 5th resistance R5 and the 3rd electric capacity C3 is connected to form, the anode of first crystal diode VD1 is connected with the junction of current stabilization element M with potentiometer RP, the negative electrode of first crystal diode VD1 is connected with single-phase rectification bridge Q port 2 by the 3rd resistance R3, the negative electrode of the second crystal diode VD2 is connected with the collector electrode of triode VT1 by the 6th resistance R6, the emitter of triode VT1 is connected with single-phase rectifier Q port 2, the base stage of triode VT1 is connected with the A pole of the first unidirectional thyristor T1 by the 4th resistance R4, the K pole of the first unidirectional thyristor T1 is connected with single-phase rectifier Q port 2, the G pole of the first unidirectional thyristor T1 is connected with the negative electrode of first crystal diode VD1, 7th resistance R7 two ends are parallel with the 4th electric capacity C4, the G pole of the second unidirectional thyristor T2 is connected with the collector electrode of triode VT1, the anode of the 4th crystal diode VD4 is connected with the anode of the 5th crystal diode VD5, the negative electrode of the 5th crystal diode VD5 is connected with the anode of the 6th crystal diode VD6, the negative electrode of the 6th crystal diode VD6 is connected with the G pole of bidirectional thyristor U1, the T1 pole of bidirectional thyristor U1 is connected with single-phase rectification bridge Q port one, the negative electrode of the 5th crystal diode VD5 is connected with the negative electrode of the 7th crystal diode VD7, the anode of the 7th crystal diode VD7 is connected with the T2 pole of bidirectional thyristor U1, the negative electrode of the 5th crystal diode VD5 is also connected with single-phase rectification bridge Q port 3 with the 9th resistance R9 by the 5th electric capacity C5 connected successively.
Alternating current is connected with port 3 with single-phase rectification bridge Q port one, load two ends are connected with single-phase rectification bridge Q port 3 with the T2 pole of bidirectional thyristor U1 respectively, once alternating current voltage is too high, the current stabilization element M voltage rise that powers on is high, make the first unidirectional thyristor T1 conducting, and triode VT1 turns off, second unidirectional thyristor T2 also turns off, thus bidirectional thyristor U1 is turned off, protect load from excessive pressure damages, owing to using bidirectional thyristor U1, bidirectional thyristor U1 closes and has no progeny once voltage returns is normal, bidirectional thyristor U1 can conducting immediately, reach automatically reset effect.
Compared with prior art; the invention has the beneficial effects as follows: the electronic component that the present invention uses some simple, cheap; constitute that a kind of structure is simple, stable performance can automatically reset excess voltage protection, in the electric protective device of family, greatly facilitate the use of people.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
One can automatically reset overvoltage crowbar, comprise power circuit, circuits for triggering and control circuit, power circuit comprises single-phase rectification bridge Q, the first resistance R1 and current stabilization element M, circuits for triggering comprise the second crystal diode VD2, the second resistance R2 and the 3rd resistance R3, and control circuit comprises bidirectional thyristor U1, the 5th crystal diode VD5 and the 6th crystal diode VD6;
The first resistance R1 of single-phase rectification bridge Q port 4 by connecting successively, potentiometer RP is connected with single-phase rectification bridge Q port 2 with current stabilization element M, single-phase rectification bridge Q port 2 is connected with single-phase rectification bridge Q port one with the second resistance R2 by the second crystal diode VD2 connected successively, the seven resistance R7 of single-phase rectification bridge Q port one by connecting successively, 8th resistance R8, 4th crystal diode VD4 is connected with single-phase rectification bridge Q port 2 with the second unidirectional thyristor T2, current stabilization element M two ends are also parallel with the first electric capacity C1, second crystal diode VD2 two ends are parallel with the second electric capacity C2, second electric capacity C2 two ends are parallel with the branch road that the 5th resistance R5 and the 3rd electric capacity C3 is connected to form, the anode of first crystal diode VD1 is connected with the junction of current stabilization element M with potentiometer RP, the negative electrode of first crystal diode VD1 is connected with single-phase rectification bridge Q port 2 by the 3rd resistance R3, the negative electrode of the second crystal diode VD2 is connected with the collector electrode of triode VT1 by the 6th resistance R6, the emitter of triode VT1 is connected with single-phase rectifier Q port 2, the base stage of triode VT1 is connected with the A pole of the first unidirectional thyristor T1 by the 4th resistance R4, the K pole of the first unidirectional thyristor T1 is connected with single-phase rectifier Q port 2, the G pole of the first unidirectional thyristor T1 is connected with the negative electrode of first crystal diode VD1, 7th resistance R7 two ends are parallel with the 4th electric capacity C4, the G pole of the second unidirectional thyristor T2 is connected with the collector electrode of triode VT1, the anode of the 4th crystal diode VD4 is connected with the anode of the 5th crystal diode VD5, the negative electrode of the 5th crystal diode VD5 is connected with the anode of the 6th crystal diode VD6, the negative electrode of the 6th crystal diode VD6 is connected with the G pole of bidirectional thyristor U1, the T1 pole of bidirectional thyristor U1 is connected with single-phase rectification bridge Q port one, the negative electrode of the 5th crystal diode VD5 is connected with the negative electrode of the 7th crystal diode VD7, the anode of the 7th crystal diode VD7 is connected with the T2 pole of bidirectional thyristor U1, the negative electrode of the 5th crystal diode VD5 is also connected with single-phase rectification bridge Q port 3 with the 9th resistance R9 by the 5th electric capacity C5 connected successively.
During concrete enforcement, current stabilization element M model is 1N5314, and the first unidirectional thyristor T1 model is 2N5060, and the second unidirectional thyristor T2 model is 2N6239, and bidirectional thyristor U1 model is 2N6346.
Claims (1)
1. one kind can automatically reset overvoltage crowbar, it is characterized in that comprising power circuit, circuits for triggering and control circuit, power circuit comprises single-phase rectification bridge Q, the first resistance R1 and current stabilization element M, circuits for triggering comprise the second crystal diode VD2, the second resistance R2 and the 3rd resistance R3, and control circuit comprises bidirectional thyristor U1, the 5th crystal diode VD5 and the 6th crystal diode VD6;
The first resistance R1 of single-phase rectification bridge Q port 4 by connecting successively, potentiometer RP is connected with single-phase rectification bridge Q port 2 with current stabilization element M, single-phase rectification bridge Q port 2 is connected with single-phase rectification bridge Q port one with the second resistance R2 by the second crystal diode VD2 connected successively, the seven resistance R7 of single-phase rectification bridge Q port one by connecting successively, 8th resistance R8, 4th crystal diode VD4 is connected with single-phase rectification bridge Q port 2 with the second unidirectional thyristor T2, current stabilization element M two ends are also parallel with the first electric capacity C1, second crystal diode VD2 two ends are parallel with the second electric capacity C2, second electric capacity C2 two ends are parallel with the branch road that the 5th resistance R5 and the 3rd electric capacity C3 is connected to form, the anode of first crystal diode VD1 is connected with the junction of current stabilization element M with potentiometer RP, the negative electrode of first crystal diode VD1 is connected with single-phase rectification bridge Q port 2 by the 3rd resistance R3, the negative electrode of the second crystal diode VD2 is connected with the collector electrode of triode VT1 by the 6th resistance R6, the emitter of triode VT1 is connected with single-phase rectifier Q port 2, the base stage of triode VT1 is connected with the A pole of the first unidirectional thyristor T1 by the 4th resistance R4, the K pole of the first unidirectional thyristor T1 is connected with single-phase rectifier Q port 2, the G pole of the first unidirectional thyristor T1 is connected with the negative electrode of first crystal diode VD1, 7th resistance R7 two ends are parallel with the 4th electric capacity C4, the G pole of the second unidirectional thyristor T2 is connected with the collector electrode of triode VT1, the anode of the 4th crystal diode VD4 is connected with the anode of the 5th crystal diode VD5, the negative electrode of the 5th crystal diode VD5 is connected with the anode of the 6th crystal diode VD6, the negative electrode of the 6th crystal diode VD6 is connected with the G pole of bidirectional thyristor U1, the T1 pole of bidirectional thyristor U1 is connected with single-phase rectification bridge Q port one, the negative electrode of the 5th crystal diode VD5 is connected with the negative electrode of the 7th crystal diode VD7, the anode of the 7th crystal diode VD7 is connected with the T2 pole of bidirectional thyristor U1, the negative electrode of the 5th crystal diode VD5 is also connected with single-phase rectification bridge Q port 3 with the 9th resistance R9 by the 5th electric capacity C5 connected successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410543958.5A CN104242234A (en) | 2014-10-15 | 2014-10-15 | Overvoltage protection circuit capable of resetting automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410543958.5A CN104242234A (en) | 2014-10-15 | 2014-10-15 | Overvoltage protection circuit capable of resetting automatically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104242234A true CN104242234A (en) | 2014-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410543958.5A Pending CN104242234A (en) | 2014-10-15 | 2014-10-15 | Overvoltage protection circuit capable of resetting automatically |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104242234A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87203013U (en) * | 1987-03-03 | 1988-05-04 | 徐占祥 | Socket style protector for refrigerator |
| CN203166464U (en) * | 2013-02-06 | 2013-08-28 | 杨远敏 | Protection circuit integrating voltage stabilization, overvoltage and overcurrent protection function |
| CN203180488U (en) * | 2013-01-19 | 2013-09-04 | 解士学 | Electric supply overvoltage home-entry protector |
-
2014
- 2014-10-15 CN CN201410543958.5A patent/CN104242234A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87203013U (en) * | 1987-03-03 | 1988-05-04 | 徐占祥 | Socket style protector for refrigerator |
| CN203180488U (en) * | 2013-01-19 | 2013-09-04 | 解士学 | Electric supply overvoltage home-entry protector |
| CN203166464U (en) * | 2013-02-06 | 2013-08-28 | 杨远敏 | Protection circuit integrating voltage stabilization, overvoltage and overcurrent protection function |
Non-Patent Citations (1)
| Title |
|---|
| 杨旭东，等: "《实用电子电路精选》", 31 January 1999 * |
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Application publication date: 20141224 |
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| RJ01 | Rejection of invention patent application after publication |