CN203491669U - Overvoltage protective circuit - Google Patents
Overvoltage protective circuit Download PDFInfo
- Publication number
- CN203491669U CN203491669U CN201320653419.8U CN201320653419U CN203491669U CN 203491669 U CN203491669 U CN 203491669U CN 201320653419 U CN201320653419 U CN 201320653419U CN 203491669 U CN203491669 U CN 203491669U
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- triode
- resistance
- resistor
- voltage
- emitter
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- Expired - Fee Related
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Abstract
The utility model discloses an overvoltage protective circuit. The circuit comprises a firs resistor, a second resistor, a third resistor, a fourth resistor, a first triode, a second triode, a third triode, a voltage-regulator diode and a light emitting diode. A voltage input end is separately connected with the first end of the first resistor, the first end of the fourth resistor, the collecting electrode of the first triode, the collecting electrode of the second triode and a first voltage output end. The second end of the first resistor is separately connected with the positive electrode of the voltage-regulator diode and the base electrode of the first triode. The emitter of the first triode is separately connected with the first end of the second resistor, the first end of the third resistor and the base electrode of the second triode. The circuit is simple in structure, and utilizes combination of the voltage-regulator diode, the plurality of triodes and the plurality of resistors to achieve the best stability of the circuit.
Description
Technical field
The utility model relates to a kind of protective circuit, relates in particular to a kind of overvoltage crowbar.
Background technology
During electrical appliance work, voltage is crossed the damage that conference causes electrical appliance.Traditional overvoltage crowbar is that supply voltage when protected electrical appliance is during higher than certain numerical value; the overvoltage crowbar circuit of cutting off the electricity supply, when supply voltage returns to normal range (NR), protector is connected automatically; the structure of this overvoltage crowbar is more complicated often, and job stability is not enough.
Utility model content
The purpose of this utility model provides a kind of overvoltage crowbar with regard to being in order to address the above problem.
In order to achieve the above object, the utility model has adopted following technical scheme:
A kind of overvoltage crowbar, comprise the first resistance to the four resistance, the first triode to the three triodes, voltage stabilizing didoe and light-emitting diode, voltage input end respectively with the first end of described the first resistance, the first end of described the 4th resistance, the collector electrode of described the first triode, the collector electrode of described the second triode is connected with the first voltage output end, the second end of described the first resistance is connected with the base stage of described the first triode with the positive pole of described voltage stabilizing didoe respectively, the emitter of described the first triode respectively with the first end of described the second resistance, the first end of described the 3rd resistance is connected with the base stage of described the second triode, the second end of described the 3rd resistance is connected with the base stage of described the 3rd triode, described the 3rd collector electrode of triode and the positive pole of described light-emitting diode are connected, the negative pole of described light-emitting diode is connected with the second end of described the 4th resistance, the negative pole of described voltage stabilizing didoe respectively with second voltage output, tertiary voltage output, the second end of described the second resistance, the emitter of described the second triode is connected with the emitter of described the 3rd triode.
The beneficial effects of the utility model are:
A kind of overvoltage crowbar of the utility model, it is simple in structure, adopts the combination of voltage stabilizing didoe, a plurality of triode and a plurality of resistance, makes the stability of circuit reach best.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of overvoltage crowbar of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, a kind of overvoltage crowbar of the utility model, comprise that the first resistance R 1 is to the 4th resistance R 4, the first triode VT1 to the three triode VT3, voltage stabilizing didoe ZD and LED, voltage input end respectively with the first end of the first resistance R 1, the first end of the 4th resistance R 4, the collector electrode of the first triode VT1, the collector electrode of the second triode VT2 is connected with the first voltage output end, the second end of the first resistance R 1 is connected with the base stage of the first triode VT1 with the positive pole of voltage stabilizing didoe ZD respectively, the emitter of the first triode VT1 respectively with the first end of the second resistance R 2, the first end of the 3rd resistance R 3 is connected with the base stage of the second triode VT2, the second end of the 3rd resistance R 3 is connected with the base stage of the 3rd triode VT3, the 3rd collector electrode of triode VT3 and the positive pole of LED are connected, the negative pole of LED is connected with the second end of the 4th resistance R 4, the negative pole of voltage stabilizing didoe ZD respectively with second voltage output, tertiary voltage output, the second end of the second resistance R 2, the emitter of the second triode VT2 is connected with the emitter of the 3rd triode VT3.
Voltage stabilizing didoe ZD detects input voltage, and when input voltage is during higher than set point, the first triode VT1 conducting, causes the second triode VT2 conducting, input short, and voltage input is turn-offed or enters limited current state, all there will not be the situation of damaging circuit.
Claims (1)
1. an overvoltage crowbar, it is characterized in that: comprise the first resistance to the four resistance, the first triode to the three triodes, voltage stabilizing didoe and light-emitting diode, voltage input end respectively with the first end of described the first resistance, the first end of described the 4th resistance, the collector electrode of described the first triode, the collector electrode of described the second triode is connected with the first voltage output end, the second end of described the first resistance is connected with the base stage of described the first triode with the positive pole of described voltage stabilizing didoe respectively, the emitter of described the first triode respectively with the first end of described the second resistance, the first end of described the 3rd resistance is connected with the base stage of described the second triode, the second end of described the 3rd resistance is connected with the base stage of described the 3rd triode, described the 3rd collector electrode of triode and the positive pole of described light-emitting diode are connected, the negative pole of described light-emitting diode is connected with the second end of described the 4th resistance, the negative pole of described voltage stabilizing didoe respectively with second voltage output, tertiary voltage output, the second end of described the second resistance, the emitter of described the second triode is connected with the emitter of described the 3rd triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653419.8U CN203491669U (en) | 2013-10-22 | 2013-10-22 | Overvoltage protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653419.8U CN203491669U (en) | 2013-10-22 | 2013-10-22 | Overvoltage protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203491669U true CN203491669U (en) | 2014-03-19 |
Family
ID=50262471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320653419.8U Expired - Fee Related CN203491669U (en) | 2013-10-22 | 2013-10-22 | Overvoltage protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203491669U (en) |
-
2013
- 2013-10-22 CN CN201320653419.8U patent/CN203491669U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20141022 |
|
| EXPY | Termination of patent right or utility model |