CN208923810U - A kind of practical over-voltage and under-voltage protecting circuit - Google Patents
A kind of practical over-voltage and under-voltage protecting circuit Download PDFInfo
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- CN208923810U CN208923810U CN201821946761.6U CN201821946761U CN208923810U CN 208923810 U CN208923810 U CN 208923810U CN 201821946761 U CN201821946761 U CN 201821946761U CN 208923810 U CN208923810 U CN 208923810U
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- 239000003381 stabilizer Substances 0.000 claims description 25
- 230000005669 field effect Effects 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a kind of practical over-voltage and under-voltage protecting circuit; including concatenated under-voltage decision circuitry, over-voltage decision circuitry and protection circuit; one end of the under-voltage decision circuitry and protection circuit is electrically connected with DC power supply, and the other end of the protection circuit is separately connected DC supply input interface and ground terminal.The utility model structure is simple, can be achieved with over-voltage and under-voltage protection using less component, at low cost and practical.
Description
Technical field
The utility model relates to power protecting circuit, in particular to a kind of practical over-voltage and under-voltage protecting circuit.
Background technique
Present electronic product has external power adapter, but sometimes due to taking power supply adaptor or electricity by mistake
It when the adaptation damage of source, uses without knowing it, will lead to electronic product work and break down, or even damage.
Utility model content
In view of the problems of the existing technology, the utility model provides a kind of practical over-voltage and under-voltage protecting circuit.
To achieve the above object, the concrete scheme of the utility model is as follows:
A kind of practical over-voltage and under-voltage protecting circuit, including concatenated under-voltage decision circuitry, over-voltage decision circuitry and guarantor
One end of protection circuit, the under-voltage decision circuitry and protection circuit is electrically connected with DC power supply, described to protect the another of circuit
End is separately connected DC supply input interface and ground terminal.
Preferably, the under-voltage decision circuitry includes a voltage-stabiliser tube D1, the cathode and DC power supply of the voltage-stabiliser tube D1
Electrical connection, anode are electrically connected with over-voltage decision circuitry.
Preferably, the over-voltage decision circuitry includes the negative of resistance R1, voltage-stabiliser tube D2 and triode Q2, the voltage-stabiliser tube D2
Pole is electrically connected with the anode of voltage-stabiliser tube D1, and is electrically connected with one end of resistance R1, anode and the triode Q2 of the voltage-stabiliser tube D2
Base stage electrical connection, the emitter ground connection of the triode Q2, collector be electrically connected with the other end of resistance R1, and electric with protecting
Road electrical connection.
Preferably, the triode Q2 is PNP type triode.
Preferably, the protection circuit includes field-effect tube Q1, triode Q3 and resistance R2, R3, the triode Q3's
Base stage is electrically connected by resistance R2 with over-voltage decision circuitry, and collector is electrically connected with the grid of field-effect tube Q1, emitter ground connection,
The resistance R3 is connected between the grid and source electrode of field-effect tube Q1, the drain electrode and DC supply input of the field-effect tube Q1
Interface electrical connection, source electrode are also electrically connected with DC power supply.
Preferably, the field-effect tube Q1 is P-channel type field-effect tube.
Preferably, the triode Q3 is PNP type triode.
Using the technical solution of the utility model, have the advantages that
The utility model structure is simple, can be achieved with over-voltage and under-voltage protection using less component, at low cost and practical
Property is strong.
Detailed description of the invention
Fig. 1 is the utility model circuit diagram；
Fig. 2 is the utility model principle block diagram；
Fig. 3 is the C-V characteristic schematic diagram of voltage-stabiliser tube D1.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Referring to Fig.1, the utility model provides a kind of practical over-voltage and under-voltage protecting circuit, including concatenated under-voltage judgement
One end of circuit 1, over-voltage decision circuitry 2 and protection circuit 3, the under-voltage decision circuitry 1 and protection circuit 3 is and DC power supply
The other end of electrical connection, the protection circuit 3 is separately connected DC supply input interface and ground terminal.
The under-voltage decision circuitry 1 includes a voltage-stabiliser tube D1, and the cathode of the voltage-stabiliser tube D1 is electrically connected with DC power supply,
Anode is electrically connected with over-voltage decision circuitry 2.
The over-voltage decision circuitry 2 includes resistance R1, voltage-stabiliser tube D2 and triode Q2, the cathode of the voltage-stabiliser tube D2 and steady
The anode electrical connection of pressure pipe D1, and be electrically connected with one end of resistance R1, the base stage of the anode and triode Q2 of the voltage-stabiliser tube D2
Electrical connection, the emitter ground connection of the triode Q2, collector are electrically connected with the other end of resistance R1, and electric with protection circuit 3
Connection.
The triode Q2 is PNP type triode.
The protection circuit 3 includes field-effect tube Q1, triode Q3 and resistance R2, R3, and the base stage of the triode Q3 is logical
It crosses resistance R2 to be electrically connected with over-voltage decision circuitry 2, collector is electrically connected with the grid of field-effect tube Q1, emitter ground connection, described
Resistance R3 is connected between the grid and source electrode of field-effect tube Q1, the drain electrode of the field-effect tube Q1 and DC supply input interface
Electrical connection, source electrode are also electrically connected with DC power supply.
The field-effect tube Q1 is P-channel type field-effect tube.
The triode Q3 is PNP type triode.
The working principle of the utility model are as follows:
Referring to figs. 1 to Fig. 3, voltage-stabiliser tube D1 is the under-voltage judgment part of circuit, voltage-stabiliser tube D2, resistance R1, PNP triode Q2
The over-voltage judgment part of circuit is constituted, resistance R2, R3, p-type metal-oxide-semiconductor Q1, PNP triode Q3 constitute the protection part of circuit；
The grid of p-type metal-oxide-semiconductor Q1 is low level when circuit 3 being protected to be connected, and PNP triode Q3 is connected at this time, and base stage is height
Level；
By the C-V characteristic of voltage-stabiliser tube D1 it is found that 1 input voltage of under-voltage decision circuitry is greater than the backward voltage of voltage-stabiliser tube
When, that is, VDC > VD1, voltage-stabiliser tube D1 reverse-conducting, be achieved in limitation low-voltage conducting function, i.e., under-voltage judgement；
When the voltage of input is greater than the backward voltage of voltage-stabiliser tube D2, voltage-stabiliser tube D2 conducting, PNP triode Q2 conducting, Q3
Cut-off, circuit cannot be connected, therefore play the role of that high pressure is protected to pass through, i.e. over-voltage judges.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the protection scope of the utility model.
Claims (7)
1. a kind of practical over-voltage and under-voltage protecting circuit, which is characterized in that judge including concatenated under-voltage decision circuitry, over-voltage
One end of circuit and protection circuit, the under-voltage decision circuitry and protection circuit is electrically connected with DC power supply, the protection electricity
The other end on road is separately connected DC supply input interface and ground terminal.
2. practical over-voltage and under-voltage protecting circuit according to claim 1, which is characterized in that the under-voltage decision circuitry
Including a voltage-stabiliser tube D1, the cathode of the voltage-stabiliser tube D1 is electrically connected with DC power supply, and anode is electrically connected with over-voltage decision circuitry.
3. practical over-voltage and under-voltage protecting circuit according to claim 2, which is characterized in that the over-voltage decision circuitry
Cathode including resistance R1, voltage-stabiliser tube D2 and triode Q2, the voltage-stabiliser tube D2 is electrically connected with the anode of voltage-stabiliser tube D1, and with electricity
One end electrical connection of R1 is hindered, the anode of the voltage-stabiliser tube D2 is electrically connected with the base stage of triode Q2, the transmitting of the triode Q2
Pole ground connection, collector are electrically connected with the other end of resistance R1, and are electrically connected with protection circuit.
4. practical over-voltage and under-voltage protecting circuit according to claim 3, which is characterized in that the triode Q2 is
PNP type triode.
5. practical over-voltage and under-voltage protecting circuit according to claim 1, which is characterized in that the protection circuit includes
Field-effect tube Q1, triode Q3 and resistance R2, R3, the base stage of the triode Q3 are electrically connected by resistance R2 and over-voltage decision circuitry
It connects, collector is electrically connected with the grid of field-effect tube Q1, and emitter ground connection, the resistance R3 is connected to the grid of field-effect tube Q1
Between source electrode, the drain electrode of the field-effect tube Q1 is electrically connected with DC supply input interface, and source electrode is also electrically connected with DC power supply
It connects.
6. practical over-voltage and under-voltage protecting circuit according to claim 5, which is characterized in that the field-effect tube Q1 is
P-channel type field-effect tube.
7. practical over-voltage and under-voltage protecting circuit according to claim 5, which is characterized in that the triode Q3 is
PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946761.6U CN208923810U (en) | 2018-11-23 | 2018-11-23 | A kind of practical over-voltage and under-voltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946761.6U CN208923810U (en) | 2018-11-23 | 2018-11-23 | A kind of practical over-voltage and under-voltage protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208923810U true CN208923810U (en) | 2019-05-31 |
Family
ID=66712293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821946761.6U Expired - Fee Related CN208923810U (en) | 2018-11-23 | 2018-11-23 | A kind of practical over-voltage and under-voltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208923810U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445092A (en) * | 2019-09-09 | 2019-11-12 | 中国电子科技集团公司第四十三研究所 | It is a kind of under-voltage to open/turn off the switch circuit and switching threshold determines method |
-
2018
- 2018-11-23 CN CN201821946761.6U patent/CN208923810U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445092A (en) * | 2019-09-09 | 2019-11-12 | 中国电子科技集团公司第四十三研究所 | It is a kind of under-voltage to open/turn off the switch circuit and switching threshold determines method |
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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: 20190531 |