CN207977728U - Power supply overpressure protection circuit structure - Google Patents
Power supply overpressure protection circuit structure Download PDFInfo
- Publication number
- CN207977728U CN207977728U CN201820537309.8U CN201820537309U CN207977728U CN 207977728 U CN207977728 U CN 207977728U CN 201820537309 U CN201820537309 U CN 201820537309U CN 207977728 U CN207977728 U CN 207977728U
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- China
- Prior art keywords
- power supply
- relay
- circuit structure
- voltage stabilizing
- stabilizing pipe
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 19
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
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Abstract
The utility model proposes a kind of power supply overpressure protection circuit structures, including bi-directional voltage stabilizing pipe, rectifier bridge, relay coil and normally-closed contact；The ac input end of rectifier bridge is attempted by the ends power supply A1 and the ends B after connecting with bi-directional voltage stabilizing pipe, the DC output end of rectifier bridge connects relay coil, the normally-closed contact of relay is serially connected in power supply and enters to hold between A1 and electrical appliance power input A, when normal voltage is connected to the ends A1 and B, bi-directional voltage stabilizing pipe is in by state, and normal voltage gives electrical appliance normal power supply by relay normally closed contact；When high voltage is accidentally connected to the ends A1 and B, high voltage may result in the conducting of bi-directional voltage stabilizing pipe, and relay coil obtains electric current and is attracted, and relay normally closed contact disconnects, and to cut off the power supply of electrical appliance, protects electrical appliance.
Description
Technical field
The utility model is related to appliances power source overpressure protection fields, specifically power supply overpressure protection circuit structure.
Background technology
PLC of existing 220V etc. controls electric appliance in the market, does not all have overpressure protection function.But Vocational College Students into
When row electric wiring installation training and examination, since the technical ability of student is not familiar or the reasons such as the live anxiety of examination, often wrong
Circuit, 308V is connected to the power end of the control electric appliance such as PLC of 220V by mistake, along with could not go through circuit it is pressed for time
In the case of, easily cause the high voltage after being powered to cause the damage for controlling electric appliance.
Utility model content
Utility model aims to solve above-mentioned existing problem, a kind of simple and reasonable for structure practical one is provided
Kind circuit structure, has better power supply overpressure protection effect, solves the protection problem that high voltage is accidentally accessed to electrical appliance.
Technical solution adopted by the utility model to solve its technical problems is：
A kind of power supply overpressure protection circuit structure, including the ends power access end A1 and the ends B, the ends electrical appliance power access end A
With the ends B, rectifier bridge, bi-directional voltage stabilizing pipe and relay, the ac input end of bi-directional voltage stabilizing pipe and rectifier bridge connects to form series electrical
Road, the series circuit are connected to the ends power access end A1 and the ends B, and the DC output end of rectifier bridge connects the two of relay coil
End, the normally-closed contact of relay are serially connected between the ends power access end A1 and the ends electrical appliance power access end A.
Preferably, the bi-directional voltage stabilizing pipe is made of the zener diode of two opposite polarities in series.
Preferably, the bi-directional voltage stabilizing pipe can be substituted by two-way type transient voltage suppressor diode TVS.
Preferably, which further includes a sound light alarming circuit for being serially connected with relay K wire loops.
Preferably, the sound light alarming circuit includes Light-emitting diode LED and buzzer BP.
The utility model proposes a kind of power supply overpressure protection circuit structures, two-way steady when normal voltage is connected to the ends A1 and B
Pressure pipe is in by state, and normal voltage gives electrical appliance normal power supply by relay normally closed contact；High voltage is connected to when missing
When the ends A1 and B, high voltage may result in the conducting of bi-directional voltage stabilizing pipe, and relay coil obtains electric current and is attracted, and relay is normally closed to be touched
Point disconnects, and to cut off the power supply of electrical appliance, protects electrical appliance.
Description of the drawings
Figure one is the circuit structure schematic diagram of the utility model first embodiment.
Scheme the circuit structure schematic diagram second is that the utility model second embodiment.
Figure three is the circuit structure schematic diagram of the utility model 3rd embodiment.
Figure four is the circuit structure schematic diagram of the utility model fourth embodiment.
Specific implementation mode
The utility model is further illustrated with reference to the accompanying drawings and examples：
First embodiment, as shown in figure：Dotted line frame 1 is overpressure protection circuit, and dotted line frame 2 is electrical appliance.
Power supply overpressure protection circuit 1 includes the ends A1 and the ends B, bi-directional voltage stabilizing pipe Dw, rectifier bridge D, the relay of power access end
The coil and normally-closed contact of device K.An ac input end of rectifier bridge D is connect into the ends power access end A1, rectifier bridge D another
Ac input end connects one end of bi-directional voltage stabilizing pipe Dw, and the ends B of another termination power access end of bi-directional voltage stabilizing pipe Dw are that is, two-way steady
Pressure pipe Dw connect to form series circuit with the ac input end of rectifier bridge D, which is connected to the ends power access end A1 and B
End；The both ends of the coil of the DC output end connection relay K of rectifier bridge D, the normally-closed contact of relay K are serially connected in power supply and enter
It holds between the ends A1 and the ends electrical appliance power input A.
When normal power voltage accesses the ends A1 and the ends B, bi-directional voltage stabilizing pipe Dw is in cut-off state, and normal power voltage is logical
It crosses relay normally closed contact and gives electrical appliance normal power supply；When high voltage is accidentally connected to the ends A1 and the ends B, high voltage may result in double
It is connected to voltage-stabiliser tube, relay coil is caused to obtain electric current and be attracted, relay normally closed contact disconnects, to cut off electrical appliance
Power supply protects electrical appliance.
Second embodiment, as shown in Figure 2：Circuit structure is similar to first embodiment, the difference is that, enter in power supply
End has also concatenated a PTC thermistor RT；When high voltage access causes the conducting of bi-directional voltage stabilizing pipe to generate electric current, this larger electricity
Stream flows through PTC thermistor RT, PTC thermistor can be made due to fever and resistance value increases, to reduce flow through it is two-way steady
The maintenance electric current of pressure pipe and relay coil；Superpressure protects principle as first embodiment, does not repeat herein.
3rd embodiment, as shown in Figure 3：Circuit structure is similar to first embodiment, the difference is that, increase sound
Optical alarm circuit 3 (dotted line frame 3), Light-emitting diode LED of having connected in the wire loop of relay K and buzzer BP.When accidentally
When high voltage is connected to the ends A1 and the ends B, high voltage may result in the conducting of bi-directional voltage stabilizing pipe and generate electric current, this electric current does not only result in
Relay K is attracted, and the normally-closed contact of relay K disconnects and protects electrical appliance, this electric current also makes Light-emitting diode LED send out
Light and buzzer BP send out and pipe, and provide the sound-light alarm of high voltage protection.
Fourth embodiment, as shown in Figure IV：Circuit structure is similar to 3rd embodiment, the difference is that, it will be two-way steady
Pressure pipe Dw replaces with two-way type transient voltage suppressor diode TVS, and circuit protection principle and warning function are realized to be implemented with second
Example is the same, does not repeat herein.
Particular embodiments described above, only the utility model preferred embodiment, such as according to the utility model
The equivalent arrangements that claim is done, the technology that should be the utility model are covered.
Claims (5)
1. a kind of power supply overpressure protection circuit structure, including the ends the power access end A1 and ends B, the electrical appliance ends power access end A and B
End, rectifier bridge, bi-directional voltage stabilizing pipe and relay, which is characterized in that the ac input end of bi-directional voltage stabilizing pipe and rectifier bridge connects shape
At series circuit, which is connected to the ends power access end A1 and the ends B, and the DC output end of rectifier bridge connects relay line
The normally-closed contact at the both ends of circle, relay is serially connected between the ends power access end A1 and the ends electrical appliance power access end A.
2. power supply overpressure protection circuit structure according to claim 1, which is characterized in that the bi-directional voltage stabilizing pipe Dw is by two
The zener diode of opposite polarities in series is constituted.
3. power supply overpressure protection circuit structure according to claim 1, which is characterized in that the bi-directional voltage stabilizing pipe Dw can be by double
It is substituted to type transient voltage suppressor diode TVS.
4. power supply overpressure protection circuit structure according to claim 1, which is characterized in that the circuit structure further includes a string
It is connected to the sound light alarming circuit of relay K wire loops.
5. power supply overpressure protection circuit structure according to claim 4, which is characterized in that the sound light alarming circuit includes
Light-emitting diode LED and buzzer BP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820537309.8U CN207977728U (en) | 2018-04-16 | 2018-04-16 | Power supply overpressure protection circuit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820537309.8U CN207977728U (en) | 2018-04-16 | 2018-04-16 | Power supply overpressure protection circuit structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207977728U true CN207977728U (en) | 2018-10-16 |
Family
ID=63763553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820537309.8U Expired - Fee Related CN207977728U (en) | 2018-04-16 | 2018-04-16 | Power supply overpressure protection circuit structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207977728U (en) |
-
2018
- 2018-04-16 CN CN201820537309.8U patent/CN207977728U/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: 20181016 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |