CN212849859U - Transient overvoltage protection device - Google Patents
Transient overvoltage protection device Download PDFInfo
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- CN212849859U CN212849859U CN202021861149.6U CN202021861149U CN212849859U CN 212849859 U CN212849859 U CN 212849859U CN 202021861149 U CN202021861149 U CN 202021861149U CN 212849859 U CN212849859 U CN 212849859U
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- rectifier bridge
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- overvoltage
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Abstract
The utility model discloses a transient overvoltage protection device. The power supply comprises a rectifier bridge, a transistor, a power resistor, an overvoltage detection circuit and a drive circuit; the rectifier bridge is in parallel flow at the power input end of the electric equipment; the transistor and the power resistor are connected to the direct current output side of the rectifier bridge; the overvoltage detection circuit and the driving circuit are connected to the direct current output side of the rectifier bridge; the driving circuit is connected with the transistor. The utility model has the advantages of when the power supply system takes place the overvoltage protection consumer, do not influence the normal work of product.
Description
Technical Field
The utility model relates to a transient overvoltage protection device. More specifically, it is a device for protecting electric consumers in the event of transient overvoltages in the power supply system.
Background
At present, the overvoltage protection function of the electric equipment is realized by cutting off a power supply when the power supply system has overvoltage, but the method can cause the electric equipment to lose power when the power supply system has overvoltage, and has great influence on the safety and reliability of important and sensitive electric equipment.
Therefore, there is a need to develop a voltage protection device that protects overvoltage without affecting normal operation of electric devices and is safe and reliable for sensitive electric devices.
Disclosure of Invention
The utility model aims at providing a transient overvoltage protection device which can realize the overvoltage protection function under the condition of not influencing the normal work of the electric equipment; the problem of prior art's overvoltage protection function when taking place the excessive pressure, directly cut off the power and lead to the consumer to lose the electricity is overcome.
In order to realize the purpose, the technical scheme of the utility model is that: a transient overvoltage protection device, characterized by: the power supply comprises a rectifier bridge, a transistor, a power resistor, an overvoltage detection circuit and a drive circuit;
the rectifier bridge is in parallel flow at the power input end of the electric equipment;
the transistor and the power resistor are connected to the direct current output side of the rectifier bridge;
the overvoltage detection circuit and the driving circuit are connected to the direct current output side of the rectifier bridge;
the driving circuit is connected with the transistor.
In the above technical solution, the rectifier bridge is a three-phase rectifier bridge;
the rectifier bridge is arranged on a three-phase power line at the power input end of the electric equipment.
In the above technical solution, the transistor is an insulated gate bipolar transistor.
The utility model has the advantages of as follows:
(1) the utility model is provided with a three-phase rectifier bridge on the three-phase power line input by the protected equipment, so that the three-phase rectifier bridge is connected with the protected equipment in parallel, and the direct current output side of the three-phase rectifier bridge is connected with the insulated gate bipolar transistor and the power resistor in series, thereby protecting the electric equipment when the power supply system generates overvoltage, and not influencing the normal work of the product;
(2) the utility model discloses insulated gate bipolar transistor, action speed can not appear the electric arc when and breaking rapidly, and simple structure is reliable.
Drawings
Fig. 1 is an electrical schematic diagram of the present invention.
In the figure, 1 is a rectifier bridge, 2 is a transistor, 3 is a power resistor, 4 is an overvoltage detection circuit, 5 is a driving circuit and 6 is electric equipment.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.
With reference to the accompanying drawings: a transient overvoltage protection device comprises a rectifier bridge 1, a transistor 2, a power resistor 3, an overvoltage detection circuit 4 and a drive circuit 5;
the rectifier bridge 1 is in parallel flow with the power supply input end of the electric equipment 6; for protecting the consumer 6;
the transistor 2 and the power resistor 3 are connected in series on the direct current output side of the rectifier bridge 1;
the overvoltage detection circuit 4 and the drive circuit 5 are connected in series on the direct current output side of the rectifier bridge 1;
the driving circuit 5 is connected with the transistor 2, when the voltage detection circuit 4 detects that the power supply system has overvoltage, the driving circuit triggers the transistor 2 to be conducted, an input power supply of the protected equipment is instantaneously short-circuited, the voltage input to the electric equipment 6 is reduced to a normal working range, and meanwhile, an instruction of reducing output voltage is sent to power generation equipment in the power supply system, so that the purpose of protecting the electric equipment 6 is achieved.
Further, the rectifier bridge 1 is a three-phase rectifier bridge; the rectifier bridge 1 is arranged on a three-phase power line input by protected equipment, so that the three-phase rectifier bridge is connected with the protected equipment in parallel, and when overvoltage occurs, the input power of the protected equipment can be short-circuited instantaneously, so that the voltage input to the electric equipment 6 is reduced to a normal working range;
the rectifier bridge 1 is arranged on a three-phase power line at the power input end of the electric equipment 6, so that the three-phase rectifier bridge is connected with the electric equipment 6 in parallel, and the electricity utilization safety of the electric equipment 6 is ensured.
Furthermore, the transistor 2 is an insulated gate bipolar transistor; the insulated gate bipolar transistor has the advantages of rapid action speed, no electric arc when the insulated gate bipolar transistor is disconnected, and simple and reliable structure.
Transient overvoltage protection device's working process as follows:
a rectifier bridge 1 is installed in parallel at a power input end of an electric device 6, a transistor 2 and a power resistor 3 are installed at a direct current side output end of the rectifier bridge 1 in series, an overvoltage detection circuit 4 detects that a direct current side output voltage value of the rectifier bridge 1 is compared with a set value, when the direct current side output voltage value of the rectifier bridge 1 is higher than the set value, the overvoltage detection circuit 4 sends a pulse width instruction to a driving circuit 5 to drive the transistor 2 to be conducted, the voltage input to the electric device 6 is reduced to a normal working voltage range, and the electric device is protected under the condition that the normal working of the electric device is not influenced (as shown in figure 1).
Other parts not described belong to the prior art.
Claims (3)
1. A transient overvoltage protection device, characterized by: the power supply circuit comprises a rectifier bridge (1), a transistor (2), a power resistor (3), an overvoltage detection circuit (4) and a drive circuit (5);
the rectifier bridge (1) is connected with the power input end of the electric equipment (6) in parallel;
the transistor (2) and the power resistor (3) are connected to the direct current output side of the rectifier bridge (1);
the overvoltage detection circuit (4) and the drive circuit (5) are connected to the direct current output side of the rectifier bridge (1);
the drive circuit (5) is connected to the transistor (2).
2. The overvoltage transient protection device of claim 1 wherein: the rectifier bridge (1) is a three-phase rectifier bridge;
the rectifier bridge (1) is arranged on a three-phase power line of a power input end of the electric equipment (6).
3. The overvoltage transient protection device of claim 1 or 2, wherein: the transistor (2) is an insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021861149.6U CN212849859U (en) | 2020-08-31 | 2020-08-31 | Transient overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021861149.6U CN212849859U (en) | 2020-08-31 | 2020-08-31 | Transient overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212849859U true CN212849859U (en) | 2021-03-30 |
Family
ID=75142756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021861149.6U Active CN212849859U (en) | 2020-08-31 | 2020-08-31 | Transient overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212849859U (en) |
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2020
- 2020-08-31 CN CN202021861149.6U patent/CN212849859U/en active Active
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