CN206498183U - A kind of over-and under-voltage protection circuit - Google Patents
A kind of over-and under-voltage protection circuit Download PDFInfo
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- CN206498183U CN206498183U CN201720156248.6U CN201720156248U CN206498183U CN 206498183 U CN206498183 U CN 206498183U CN 201720156248 U CN201720156248 U CN 201720156248U CN 206498183 U CN206498183 U CN 206498183U
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Abstract
The utility model is related to a kind of over-and under-voltage protection circuit, including voltage input end, the voltage input end passes through overvoltage crowbar, under-voltage protecting circuit and control circuit connection voltage output end, the first voltage-regulator diode is provided with the overvoltage crowbar, the second voltage-regulator diode is provided with the under-voltage protecting circuit, the breakdown voltage of first voltage-regulator diode is more than the second voltage-regulator diode, when the voltage of voltage input end is between the first voltage-regulator diode and the second voltage-regulator diode breakdown voltage, voltage output end just has voltage output, the utility model controls whether overvoltage crowbar is opened with under-voltage protecting circuit by the first voltage-regulator diode and the second voltage-regulator diode, further control controls the triode in circuit, triode is equivalent to switch, so as to which whether control voltage output end has voltage output, the utility model provides a kind of simple, easily over-and under-voltage protection circuit.
Description
Technical field
The utility model is related to a kind of power circuit, and in particular to a kind of over-and under-voltage protection circuit.
Background technology
During electrical equipment use, voltage is excessive or voltage is too small can all cause damage of product, and general power supply manufacturers exist
Produce during power supply, over-and under-voltage protection circuit can be designed in a power, so that the use of electrical appliance is protected, more life
Business men can select to be collected the electric signal of voltage output end using comparison circuit, then feed back in single-chip microcomputer, pass through list
Piece machine is controlled to the voltage of voltage output end, this control mode has that circuit is complicated, is unfavorable for production and processing, cost compared with
High the shortcomings of.
Utility model content
The utility model passes through the first voltage-regulator diode and second its object is to disclose a kind of over-and under-voltage protection circuit
Whether voltage-regulator diode control overvoltage crowbar is opened with under-voltage protecting circuit, further three poles in control control circuit
Pipe, triode is equivalent to switch, so that whether control voltage output end has voltage output, the utility model provides a kind of letter
List, easily over-and under-voltage protection circuit.
Realizing the technical scheme of over-and under-voltage protection circuit described in the utility model is：A kind of over-and under-voltage protection circuit,
Including voltage input end, the voltage input end is by overvoltage crowbar, under-voltage protecting circuit and control circuit connection voltage
Output end, the overvoltage crowbar includes the first voltage-regulator diode, and the positive pole of the voltage input end connects the first voltage stabilizing two
The negative pole of pole pipe, the negative pole ground connection of the voltage input end, positive pole connection first resistor one end of first voltage-regulator diode,
The first resistor other end is grounded by second resistance, and the first resistor other end also connects first by 3rd resistor
The base stage of NPN triode, the under-voltage protecting circuit includes the second voltage-regulator diode, the positive pole connection the of the voltage input end
The negative pole of two voltage-regulator diodes, the positive pole of the cathode connecting diode of second voltage-regulator diode, the negative pole of the diode
The colelctor electrode of the first NPN triode and the base stage of the second NPN triode are connected by the 4th resistance, the control circuit includes the
One NPN triode, the second NPN triode and PNP triode, the grounded emitter of first NPN triode, described first
The colelctor electrode of NPN triode connects the base stage of the second NPN triode, and the colelctor electrode of second NPN triode passes through the 5th electricity
Resistance and the 6th resistance connect the positive pole of voltage output end, the collector emitter ground connection of second NPN triode, the described 5th
The base stage of PNP triode is connected between resistance and the 6th resistance provided with branch, the colelctor electrode connection voltage of the PNP triode is defeated
Go out the positive pole at end, the emitter stage of the PNP triode connects the negative pole of voltage output end, and the negative pole of the voltage output end passes through
First capacity earth.
Further, the breakdown voltage of first voltage-regulator diode is more than the breakdown voltage of the second voltage-regulator diode.
Further, branch road is provided between the negative pole of the positive pole of the voltage input end and the first voltage-regulator diode, it is described
Branch road passes through the 7th resistance eutral grounding.
Further, branch road, the branch road are provided between the positive pole of first voltage-regulator diode and the positive pole of diode
Pass through the 8th resistance eutral grounding.
Further, branch road is provided between the colelctor electrode of first NPN triode and the base stage of the second NPN triode,
The branch road passes through the 9th resistance eutral grounding.
Further, the base stage of first NPN triode passes through the second capacity earth.
Brief description of the drawings
Fig. 1 is the circuit diagram of over-and under-voltage protection circuit described in the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Embodiment：A kind of over-and under-voltage protection circuit, including voltage input end, the voltage input end pass through overvoltage protection
Circuit, under-voltage protecting circuit and control circuit connection voltage output end, the overvoltage crowbar include the first voltage-regulator diode
D1, the positive pole of the voltage input end connects the first voltage-regulator diode D1 negative pole, the negative pole ground connection of the voltage input end, institute
The first voltage-regulator diode D1 positive pole connection first resistor R1 one end is stated, the first resistor R1 other ends pass through second resistance R2
Ground connection, the first resistor R1 other ends are also by the base stage of 3rd resistor R3 the first NPN triode Q1s of connection, the under-voltage guarantor
Protection circuit includes the second voltage-regulator diode D2, and the positive pole of the voltage input end connects the second voltage-regulator diode D2 negative pole, institute
The second voltage-regulator diode D2 cathode connecting diode D3 positive pole is stated, the negative pole of the diode D3 is connected by the 4th resistance R4
The colelctor electrode of the first NPN triode Q1 and the second NPN triode Q2 base stage are connect, the control circuit includes the poles of the first NPN tri-
Pipe Q1, the second NPN triode Q2 and PNP triode Q3, the grounded emitter of first NPN triode Q1, the first NPN
Triode Q1 colelctor electrode connects the second NPN triode Q2 base stage, and the colelctor electrode of the second NPN triode Q2 passes through the 5th
Resistance R5 and the 6th resistance R6 connection voltage output ends positive pole, the collector emitter ground connection of the second NPN triode Q2,
PNP triode Q3 base stage is connected between the 5th resistance R5 and the 6th resistance R6 provided with branch, the PNP triode Q3's
Colelctor electrode connects the positive pole of voltage output end, and the emitter stage of the PNP triode Q3 connects the negative pole of voltage output end, the electricity
The negative pole of pressure output end is grounded by the first electric capacity C1.
The breakdown voltage of the first voltage-regulator diode D1 is more than the second voltage-regulator diode D2 breakdown voltage.
Branch road is provided between the positive pole of the voltage input end and the first voltage-regulator diode D1 negative pole, the branch road passes through
7th resistance R7 is grounded, and branch road, the branch are provided between the positive pole of the first voltage-regulator diode D2 and diode D3 positive pole
Road is grounded by the 8th resistance R7, is set between the colelctor electrode of first NPN triode Q1 and the second NPN triode Q2 base stage
There is branch road, the branch road is grounded by the 9th resistance R9, the base stage of first NPN triode Q1 is connect by the second electric capacity C2
Ground, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the second electric capacity C2 effects are protection circuit, it is to avoid circuit
Middle electric current is excessive or voltage is excessive.
The operation principle of the present embodiment：Following three kinds of situations can be produced in the circuit course of work：1）When voltage is less than first
When voltage-regulator diode D1 and the second voltage-regulator diode D2 breakdown voltage, under-voltage protecting circuit, overvoltage crowbar are in open circuit
State, so as to cause the second NPN triode Q2 base stage to be in low level state, the second NPN triode Q2 disconnects, so as to cause
PNP triode Q3 disconnects, so as to cause voltage output end not have voltage output.2）When voltage higher than the first voltage-regulator diode D1 with
During the second voltage-regulator diode D2 breakdown voltage, under-voltage protecting circuit, overvoltage crowbar are in channel status, the first NPN tri-
Pole pipe Q1 base stage is in high level state, the conducting of the first NPN triode Q1, the second NPN triode Q2 base earth, second
NPN triode Q2 disconnects, so as to cause PNP triode Q3 to disconnect, so as to cause voltage output end not have voltage output.3）Work as electricity
Force down when the first voltage-regulator diode D1 is but higher than the second voltage-regulator diode D2, under-voltage protecting circuit is in channel status, overvoltage
Protection circuit is in off state, and the base stage of the first NPN triode Q1 is in low level state, and the first NPN triode Q1 disconnects,
Second NPN triode Q2 base stage is in high level state, the second NPN triode Q2 conductings, so as to cause PNP triode Q3 to lead
It is logical, so as to cause voltage output end to have voltage output.
The beneficial effects of the utility model are：The utility model passes through the first voltage-regulator diode and the second voltage-regulator diode
The break-make of effect control overvoltage crowbar and under-voltage protecting circuit, so that when realizing over-pressed or under-voltage, circuit disconnects, so that
Electrical appliance is protected, this circuit design is simple, it is convenient to process and power supply production cost be reduced.
Claims (6)
1. a kind of over-and under-voltage protection circuit, including voltage input end, it is characterised in that the voltage input end is protected by overvoltage
Protection circuit, under-voltage protecting circuit and control circuit connection voltage output end, the overvoltage crowbar include the pole of the first voltage stabilizing two
Pipe, the positive pole of the voltage input end connects the negative pole of the first voltage-regulator diode, and the negative pole ground connection of the voltage input end is described
Positive pole connection first resistor one end of first voltage-regulator diode, the first resistor other end is grounded by second resistance, described
The first resistor other end also connects the base stage of the first NPN triode by 3rd resistor, and the under-voltage protecting circuit includes second
Voltage-regulator diode, the positive pole of the voltage input end connects the negative pole of the second voltage-regulator diode, second voltage-regulator diode
The positive pole of cathode connecting diode, the negative pole of the diode by the 4th resistance connect the first NPN triode colelctor electrode and
The base stage of second NPN triode, the control circuit includes the first NPN triode, the second NPN triode and PNP triode, institute
The grounded emitter of the first NPN triode is stated, the colelctor electrode of first NPN triode connects the base stage of the second NPN triode,
The colelctor electrode of second NPN triode connects the positive pole of voltage output end, described second by the 5th resistance and the 6th resistance
The collector emitter ground connection of NPN triode, PNP triode is connected between the 5th resistance and the 6th resistance provided with branch
Base stage, the colelctor electrode of the PNP triode connects the positive pole of voltage output end, the emitter stage connection voltage of the PNP triode
The negative pole of output end, the negative pole of the voltage output end passes through the first capacity earth.
2. over-and under-voltage protection circuit according to claim 1, it is characterised in that the breakdown potential of first voltage-regulator diode
Breakdown voltage of the pressure more than the second voltage-regulator diode.
3. over-and under-voltage protection circuit according to claim 1, it is characterised in that the positive pole of the voltage input end and first
Branch road is provided between the negative pole of voltage-regulator diode, the branch road passes through the 7th resistance eutral grounding.
4. over-and under-voltage protection circuit according to claim 1, it is characterised in that the positive pole of first voltage-regulator diode with
Branch road is provided between the positive pole of diode, the branch road passes through the 8th resistance eutral grounding.
5. over-and under-voltage protection circuit according to claim 1, it is characterised in that the colelctor electrode of first NPN triode
Branch road is provided between the base stage of the second NPN triode, the branch road passes through the 9th resistance eutral grounding.
6. over-and under-voltage protection circuit according to claim 1, it is characterised in that the base stage of first NPN triode is led to
Cross the second capacity earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720156248.6U CN206498183U (en) | 2017-02-21 | 2017-02-21 | A kind of over-and under-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720156248.6U CN206498183U (en) | 2017-02-21 | 2017-02-21 | A kind of over-and under-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206498183U true CN206498183U (en) | 2017-09-15 |
Family
ID=59805493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720156248.6U Expired - Fee Related CN206498183U (en) | 2017-02-21 | 2017-02-21 | A kind of over-and under-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206498183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019080198A1 (en) * | 2017-10-24 | 2019-05-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic induction type wireless power supply system and load sudden-change protection circuit therefor |
-
2017
- 2017-02-21 CN CN201720156248.6U patent/CN206498183U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019080198A1 (en) * | 2017-10-24 | 2019-05-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic induction type wireless power supply system and load sudden-change protection circuit therefor |
| US11101645B2 (en) | 2017-10-24 | 2021-08-24 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd. | Electromagnetic induction type wireless power supply system and load sudden-change protection circuit thereof |
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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: 20170915 |