CN210608514U - Plc power supply overvoltage protection device - Google Patents
Plc power supply overvoltage protection device Download PDFInfo
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- CN210608514U CN210608514U CN201922041657.3U CN201922041657U CN210608514U CN 210608514 U CN210608514 U CN 210608514U CN 201922041657 U CN201922041657 U CN 201922041657U CN 210608514 U CN210608514 U CN 210608514U
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- diode
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- triode
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- 230000005669 field effect Effects 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000001012 protector Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a plc power overvoltage protector, including overvoltage crowbar, overvoltage crowbar includes integrated circuit, first resistance, the second resistance, the third resistance, first electric capacity, the second electric capacity, the third electric capacity, the fourth electric capacity, first diode, the second diode, triode and field effect transistor, integrated circuit's model is MAX6495, in this plc power overvoltage protector, overvoltage crowbar can play the overvoltage protection function, and third resistance and first diode (zener diode) have been added, be used for carrying out the clamp to integrated circuit's first end, the biggest input voltage has been increased, the triode has been added, can reduce integrated circuit's current demand, the stability of overvoltage crowbar work has been improved, the utility model relates to a rationally, be fit for using widely.
Description
Technical Field
The utility model relates to a PLC protection device technical field, concretely relates to PLC power supply overvoltage protector.
Background
In the existing PLC overvoltage protection device, overvoltage protection can be carried out on input voltage, but when a protection circuit carries out action protection, surge enters an internal circuit, a subsequent protection circuit is required to carry out further protection at the moment, energy storage is simply carried out through a large capacitor to carry out protection at present, but through long-time work, the capacitance value of the capacitor can be reduced, initial overvoltage protection setting cannot be met, and the reliability of the protection device is further reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome foretell not enough, provide a plc power supply overvoltage protector.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a plc power supply overvoltage protection device comprises an overvoltage protection circuit, wherein the overvoltage protection circuit comprises an integrated circuit, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a triode and a field effect tube, the type of the integrated circuit is MAX6495, a first end and a second end of the integrated circuit are connected, the first end of the integrated circuit is grounded through the first capacitor, the first end of the integrated circuit is connected with an emitter of the triode, a collector of the triode is respectively connected with a cathode of the second diode and a source of the field effect tube, a base of the triode is respectively connected with the third resistor and the fourth capacitor, the first diode is connected with the fourth capacitor in parallel, an anode of the first diode is grounded, an anode of the second diode is externally connected with a power supply, a cathode of the second diode is grounded through the second capacitor, and a cathode of the second diode is grounded through a series circuit formed by the third resistor and the fourth capacitor, the fourth end of the integrated circuit is grounded, the sixth end of the integrated circuit is connected with the drain electrode of the field-effect tube, the third end of the integrated circuit is connected with the first resistor and the second resistor respectively, the third capacitor is connected with the series circuit formed by the first resistor and the second resistor in parallel, the drain electrode of the field-effect tube is grounded through the series circuit formed by the first resistor and the second resistor, and the grid electrode of the field-effect tube is connected with the fifth end of the integrated circuit.
In the overvoltage protection circuit, after the input voltage passes through the second diode, when the voltage value exceeds an overvoltage threshold set by a user, the grid electrode of the field effect transistor is pulled down, the field effect transistor is turned off, the load is disconnected with the input power supply, and the overvoltage protection effect of the PLC power supply is further achieved;
the overvoltage protection circuit comprises a first resistor, a second resistor, a third resistor, a first diode (Zener diode), a second diode, a third resistor, a third diode and a third diode, wherein the third resistor and the first diode (Zener diode) are added and used for clamping a first end of the integrated circuit, the maximum input voltage is increased, the triode is added as a buffer, the current requirement of the integrated circuit can be reduced, and the working stability of the overvoltage protection circuit is further improved.
Preferably, the first diode has model number SMBJ54A, and the third resistor has a resistance of 10k Ω.
Preferably, the triode is an NPN triode.
The utility model has the advantages that: among this plc power overvoltage protector, overvoltage crowbar can play the overvoltage protection function, has added third resistance and first diode (zener diode) moreover for carry out the clamper to integrated circuit's first end, increased the biggest input voltage, added the triode, can reduce integrated circuit's current demand, improved overvoltage crowbar job's stability.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic circuit diagram of the present invention.
In the figure: u1. integrated circuit, R1, first resistor, R2, second resistor, R3, third resistor, C1, first capacitor, C2., second capacitor, C3., third capacitor, C4, fourth capacitor, VD1, first diode, VD2, second diode, Q1. field effect transistor, Q2, triode.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, a plc power supply overvoltage protection device includes an overvoltage protection circuit, the overvoltage protection circuit includes an integrated circuit U1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first diode VD1, a second diode VD2, a transistor Q2 and a field effect transistor Q1, the integrated circuit U1 is of a model MAX6495, a first end and a second end of the integrated circuit U1 are connected, the first end of the integrated circuit U1 is connected to ground through a first capacitor C1, the first end of the integrated circuit U1 is connected to an emitter of a transistor Q2, a collector of the transistor Q2 is connected to a cathode of the second diode VD2 and a source of the field effect transistor Q2, a base of the transistor Q2 is connected to the third resistor R2 and the fourth capacitor C2, the first diode VD2 is connected to ground, the anode 2 and the fourth diode VD2, an anode of the second diode VD2 is externally connected with a power supply, a cathode of the second diode VD2 is grounded through a second capacitor C2, a cathode of the second diode VD2 is grounded through a series circuit formed by a third resistor R3 and a fourth capacitor C4, a fourth end of the integrated circuit U1 is grounded, a sixth end of the integrated circuit U1 is connected with a drain of the field-effect tube Q1, a third end of the integrated circuit U1 is connected with the first resistor R1 and the second resistor R2 respectively, the third capacitor C3 is connected with the series circuit formed by the first resistor R1 and the second resistor R2 in parallel, a drain of the field-effect tube Q1 is grounded through a series circuit formed by the first resistor R1 and the second resistor R2, and a gate of the field-effect tube Q1 is connected with a fifth end of the integrated circuit U1.
In the overvoltage protection circuit, after the input voltage passes through the second diode VD2, when the voltage value exceeds the overvoltage threshold set by a user, the grid of the field-effect tube Q1 is pulled down, the field-effect tube Q1 is switched off, and the load is disconnected with the input power supply;
the third resistor R3 and the first diode VD1 (zener diode) are added and used for clamping the first end of the integrated circuit U1, the maximum input voltage is increased, the triode Q2 is added to serve as a buffer, the current requirement of the integrated circuit U1 can be reduced, and the working stability of the overvoltage protection circuit is further improved.
In this example: the model of the first diode VD1 is SMBJ54A, and the resistance value of the third resistor R3 is 10k omega.
In this example: the transistor Q2 is an NPN transistor.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A plc power supply overvoltage protection device characterized in that: the overvoltage protection circuit comprises an integrated circuit, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a triode and a field effect tube, wherein the model of the integrated circuit is MAX6495, the first end and the second end of the integrated circuit are connected, the first end of the integrated circuit is grounded through the first capacitor, the first end of the integrated circuit is connected with an emitter of the triode, a collector of the triode is respectively connected with a cathode of the second diode and a source of the field effect tube, a base of the triode is respectively connected with the third resistor and the fourth capacitor, the first diode is connected with the fourth capacitor in parallel, an anode of the first diode is grounded, an anode of the second diode is externally connected with a power supply, a cathode of the second diode is grounded through the second capacitor, and a cathode of the second diode is grounded through a series circuit formed by the third resistor and the fourth capacitor, the fourth end of the integrated circuit is grounded, the sixth end of the integrated circuit is connected with the drain electrode of the field-effect tube, the third end of the integrated circuit is connected with the first resistor and the second resistor respectively, the third capacitor is connected with the series circuit formed by the first resistor and the second resistor in parallel, the drain electrode of the field-effect tube is grounded through the series circuit formed by the first resistor and the second resistor, and the grid electrode of the field-effect tube is connected with the fifth end of the integrated circuit.
2. The plc power supply overvoltage protection device of claim 1, wherein: the model of the first diode is SMBJ54A, and the resistance value of the third resistor is 10k omega.
3. The plc power supply overvoltage protection device of claim 1, wherein: the triode is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922041657.3U CN210608514U (en) | 2019-11-22 | 2019-11-22 | Plc power supply overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922041657.3U CN210608514U (en) | 2019-11-22 | 2019-11-22 | Plc power supply overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210608514U true CN210608514U (en) | 2020-05-22 |
Family
ID=70694035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922041657.3U Expired - Fee Related CN210608514U (en) | 2019-11-22 | 2019-11-22 | Plc power supply overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210608514U (en) |
-
2019
- 2019-11-22 CN CN201922041657.3U patent/CN210608514U/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: 20200522 |