IGBT module with overvoltage protection function

Abstract

The utility model relates to the technical field of power electronics, in particular to an IGBT (Insulated Gate Bipolar Translator) module with an overvoltage protection function. The utility model provides an IGBT module with an overvoltage protection function, which comprises a bottom plate, a mold shell, a connecting plate, a circuit board, a voltage measuring device, a comparator, a circuit breaker, a gas discharge tube and the like, the mold shell is mounted at the top of the bottom plate, the connecting plate is mounted on the bottom plate, the circuit board is mounted on the upper layer of the connecting plate, the voltage measuring device is mounted on the circuit board, and the comparator is mounted on the circuit board. A comparator is installed on the right side of the voltage measuring device, the comparator is electrically connected with the voltage measuring device, the comparator is connected with the circuit board, a circuit breaker is installed on the circuit board, the circuit breaker is electrically connected with the comparator, the circuit breaker is located on the left side of the voltage measuring device, and a gas discharge tube is installed on the circuit board and electrically connected with the circuit breaker. The gas discharge tube is adopted, when the voltage exceeds a threshold value, ionization conduction is carried out, excess energy is rapidly transferred to the ground or a power supply, the device is particularly suitable for high-energy transient voltage, and efficient overvoltage protection is achieved.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to an IGBT module with overvoltage protection function. Background Technology

[0002] An IGBT module is a power semiconductor device that combines the advantages of MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) and BJTs (Bipolar Junction Transistors), featuring high input impedance, fast switching speed, low on-state voltage drop, and high current carrying capacity. IGBT modules are widely used in power electronics, especially in applications requiring high efficiency, high reliability, and high-power energy conversion.

[0003] In the field of overvoltage protection, traditional methods rely heavily on a series of simple electronic components and circuits, such as fuses, varistors, transient voltage suppressor diodes (TVS diodes), and RC snubber circuits. While these traditional protection measures are indeed effective in providing stable and reliable overvoltage protection, their response speed is relatively slow, making them ineffective in dealing with transient overvoltage situations. Furthermore, these traditional methods are primarily designed for overcurrent protection and have limited response capabilities to transient overvoltage events.

[0004] Therefore, it is necessary to design an IGBT module with overvoltage protection. Utility Model Content

[0005] To overcome the problem that traditional protection measures have a relatively slow response speed and are difficult to effectively deal with transient overvoltage situations, this utility model provides an IGBT module with overvoltage protection function.

[0006] An IGBT module with overvoltage protection includes a base plate, a housing, a connecting plate, a circuit board, a voltage sensor, a comparator, a circuit breaker, and a gas discharge tube. The housing is mounted on top of the base plate, and the connecting plate is mounted on the base plate. The circuit board is mounted on the upper layer of the connecting plate, and the voltage sensor is mounted on the circuit board. The comparator is mounted to the right of the voltage sensor and is electrically connected to the voltage sensor and the circuit board. The circuit breaker is mounted on the circuit board and is electrically connected to the comparator. The circuit breaker is located to the left of the voltage sensor. The gas discharge tube is mounted on the circuit board and is electrically connected to the circuit breaker.

[0007] In one embodiment, an overvoltage bypass switch is also included, which is mounted on the circuit board, and the circuit breaker is electrically connected to the overvoltage bypass switch.

[0008] In one embodiment, a voltage shunt is also included, which is mounted on the connection plate.

[0009] In one embodiment, a fast-acting fuse is also included, which is mounted on the connection plate.

[0010] In one embodiment, an energy storage device is also included, which is mounted on the connection plate.

[0011] In one embodiment, mounting openings are pre-set at the four corners of the base plate and the mold shell.

[0012] The beneficial effects and significant advancements of this utility model are as follows:

[0013] This invention uses a gas discharge tube, which ionizes and conducts electricity when the voltage exceeds the threshold, quickly transferring excess energy to ground or power source. It is particularly suitable for high-energy transient voltages, achieving efficient overvoltage protection. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the pressure gauge, comparator, circuit breaker, and gas discharge tube components of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the components of this utility model, including the voltage shunt, fast-acting fuse, and energy storage device.

[0017] Reference numerals: 1_base plate, 2_mold shell, 3_connecting plate, 4_circuit board, 5_pressure sensor, 6_comparator, 7_circuit breaker, 8_gas discharge tube, 9_overvoltage bypass switch, 10_voltage shunt, 11_fast-acting fuse, 12_energy storage device. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example: An IGBT module with overvoltage protection function, reference Figures 1 to 3As shown, the IGBT module includes a base plate 1, a housing 2, a connecting plate 3, a circuit board 4, a pressure sensor 5, a comparator 6, a circuit breaker 7, a gas discharge tube 8, an overvoltage bypass switch 9, a voltage shunt 10, a fast-acting fuse 11, and an energy storage device 12. The housing 2 is mounted on top of the base plate 1 to protect the internal components of the IGBT module. Mounting openings are pre-set at the four corners of the base plate 1 and the housing 2 to facilitate the installation of the IGBT module. The connecting plate 3 is mounted on the base plate 1, and the circuit board 4 is mounted on top of the connecting plate 3. The pressure sensor 5 is mounted on the circuit board 4, and the comparator 6 is mounted on the right side of the pressure sensor 5. The comparator 6 is electrically connected to the pressure sensor 5 and to the circuit board 4. The circuit breaker 7 is mounted on the circuit board 4 and is electrically connected to the comparator 6 to cut off power. Device 7 is located to the left of voltage sensor 5. Gas discharge tube 8 is installed on circuit board 4 to handle large energy transients. Gas discharge tube 8 is electrically connected to circuit breaker 7 and is located to the left of circuit breaker 7. Overvoltage bypass switch 9 is installed on circuit board 4 and is electrically connected to circuit breaker 7. Overvoltage bypass switch 9 is located in front of comparator 6. Voltage shunt 10 is installed on connection plate 3 to change the resistance distribution in the circuit and reduce the voltage across the IGBT module. Fast fuse 11 is installed on connection plate 3 and is located in front of voltage shunt 10. Energy storage device 12 is installed on connection plate 3. The upper part of energy storage device 12 extends through circuit board 4 and is used to absorb excess energy.

[0020] When the IGBT module is in use, the voltage across the IGBT module is monitored by the voltage sensor 5, and the detected voltage is compared with a preset reference voltage. When the voltage exceeds the set threshold, the relay coil is energized. When the voltage exceeds the breakdown voltage of the gas discharge tube 8, the gas inside the tube is ionized, forming a conductive path that diverts excess energy to ground or the power source. The gas discharge tube 8 has a fast response speed, making it suitable for handling large energy transients. The IGBT module is equipped with a voltage shunt 10, a mechanical voltage shunt 10 that reduces the voltage across the IGBT module by changing the resistance distribution in the circuit, thus preventing damage from overvoltage. The overvoltage bypass switch 9 quickly isolates the IGBT module from the main circuit when overvoltage is detected, stopping its operation and preventing damage from overvoltage. The overvoltage bypass switch 9 acts as a last line of defense, ensuring that the IGBT module will not be damaged by overvoltage if other protection measures fail. A fast-acting fuse 11 is installed on the connection plate 3. The fast-acting fuse 11 is designed to quickly melt and disconnect the circuit when the current or voltage exceeds a set threshold. A mechanical energy storage and release module can store excess electrical energy and release it back into the circuit when appropriate, thus preventing overvoltage damage to the IGBT module. When overvoltage is detected, excess energy is transferred to the energy storage device 12 and slowly released back into the circuit when needed, or the energy is directly consumed. This effectively absorbs and releases large amounts of energy.

[0021] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An IGBT module with overvoltage protection function, characterized in that: The device includes a base plate (1), a mold shell (2), a connecting plate (3), a circuit board (4), a pressure gauge (5), a comparator (6), a circuit breaker (7), and a gas discharge tube (8). The mold shell (2) is mounted on the top of the base plate (1). The connecting plate (3) is mounted on the base plate (1). The circuit board (4) is mounted on the upper layer of the connecting plate (3). The pressure gauge (5) is mounted on the circuit board (4). The comparator (6) is mounted on the right side of the pressure gauge (5). The comparator (6) is electrically connected to the pressure gauge (5) and is also connected to the circuit board (4). The circuit breaker (7) is mounted on the circuit board (4) and is electrically connected to the comparator (6). The circuit breaker (7) is located to the left of the pressure gauge (5). The gas discharge tube (8) is mounted on the circuit board (4) and is electrically connected to the circuit breaker (7).

2. An IGBT module with overvoltage protection function as described in claim 1, characterized in that: It also includes an overvoltage bypass switch (9), which is installed on the circuit board (4), and the circuit breaker (7) is electrically connected to the overvoltage bypass switch (9).

3. An IGBT module with overvoltage protection function as described in claim 2, characterized in that: It also includes a voltage shunt (10), which is mounted on the connecting plate (3).

4. An IGBT module with overvoltage protection function as described in claim 3, characterized in that: It also includes a fast-acting fuse (11), which is installed on the connecting plate (3).

5. An IGBT module with overvoltage protection function as described in claim 4, characterized in that: It also includes an energy storage device (12), which is installed on the connecting plate (3).

6. An IGBT module with overvoltage protection function as described in claim 1, characterized in that: The base plate (1) and the mold shell (2) have mounting holes at their four corners.

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