IGBT working state detection circuit

By designing an IGBT operating status detection circuit, the problem of insufficient IGBT operating status detection under high temperature environment is solved, realizing high temperature quality detection of IGBT and ensuring its reliability and stability under high voltage and high current environment.

CN223501108UActive Publication Date: 2025-10-31SHANGHAI YINGTONG ELECTRIC
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422613555.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-10-31
Estimated Expiration
2034-10-29

AI Technical Summary

Technical Problem

Existing technologies lack testing for the operating status of IGBTs in high-temperature environments, resulting in incomplete quality control before shipment.

Method used

An IGBT operating status detection circuit was designed, including a conduction control module, an IGBT module, a temperature heating module, and a temperature detection and stop module. By controlling the conduction status of the IGBT and adjusting the ambient temperature, the operating status of the IGBT at different temperatures can be detected.

Benefits of technology

This technology enables effective quality testing of IGBTs under high-temperature environments, ensuring the reliability and stability of IGBTs under high-voltage and high-current conditions.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223501108U_ABST
    Figure CN223501108U_ABST
Patent Text Reader

Abstract

The utility model discloses an IGBT (Insulated Gate Bipolar Translator) working state detection circuit, which relates to the field of detection and comprises a conduction control module used for changing output voltage and controlling the conduction condition of an IGBT module; the IGBT module is used for the IGBT to work; the temperature heating module is used for heating the temperature of the environment where the IGBT module is located; the temperature detection stop module is used for disconnecting the working loop of the temperature heating module when the temperature of the environment where the IGBT is located reaches a set value; the conduction control module is connected with the IGBT module, the temperature heating module is connected with the IGBT module, and the temperature detection stop module is connected with the temperature heating module; compared with the prior art, the beneficial effects of the utility model are that the temperature heating module and the temperature detection stop module are arranged to assist in completing the IGBT state test, so as to detect the conduction conditions of the IGBT in different temperature environments and judge whether the quality of the IGBT is qualified or not.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model relates to the field of detection, specifically an IGBT operating status detection circuit. Background Technology

[0002] IGBTs are composite fully controllable voltage-driven power semiconductor devices composed of BJTs (bipolar junction transistors) and insulated-gate field-effect transistors (MOS). They have advantages such as high efficiency, energy saving, and reliability. They can control large currents and are suitable for converter systems with DC voltages of 600V and above, such as AC motors, frequency converters, switching power supplies, lighting circuits, traction drives, and other fields.

[0003] IGBT applications are mostly in high-voltage, high-current environments, but current technologies lack the ability to test the operating status of IGBTs at high temperatures during factory quality inspections, which needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide an IGBT operating status detection circuit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An IGBT operating status detection circuit includes:

[0007] The conduction control module is used to change the output voltage and control the conduction status of the IGBT module.

[0008] IGBT module, used for IGBT operation;

[0009] Temperature heating module, used to heat the ambient temperature of the IGBT module;

[0010] The temperature detection and stop module is used to disconnect the working circuit of the temperature heating module when the ambient temperature of the IGBT reaches the set value.

[0011] The conduction control module is connected to the IGBT module, the temperature heating module is connected to the IGBT module, and the temperature detection and stop module is connected to the temperature heating module.

[0012] As a further embodiment of this utility model: the conduction control module includes a resistor R1, a capacitor C1, a voltage regulator U1, a potentiometer RP1, a resistor R2, and a capacitor C2. One end of the resistor R1 is connected to the power supply voltage VCC, and the other end of the resistor R1 is connected to one end of the capacitor C1 and the input terminal of the voltage regulator U1. The other end of the capacitor C1 is grounded. The ground terminal of the voltage regulator U1 is connected to one end of the potentiometer RP1, one end of the resistor R2, and one end of the capacitor C2. The other end of the resistor R2 is grounded, and the other end of the capacitor C2 is grounded. The output terminal of the voltage regulator U1 is connected to the other end of the potentiometer RP1 and the IGBT module.

[0013] As a further embodiment of this utility model: the IGBT module includes an IGBT, resistor R3, resistor R4, and voltmeter V. The G terminal of the IGBT is connected to the conduction control module, the C terminal of the IGBT is connected to one end of resistor R4, the E terminal of the IGBT is connected to one end of resistor R3 and one end of voltmeter V, the other end of resistor R4 is connected to the power supply voltage VCC, the other end of resistor R3 is grounded, and the other end of voltmeter V is grounded.

[0014] As a further embodiment of this utility model: the temperature heating module includes a resistor R6, a diode D2, a switch S1, an inverter U2, a resistor R5, a capacitor C3, a diode D1, a thyristor Z1, and a heater X. One end of the resistor R6 is connected to the power supply voltage VCC, and the other end of the resistor R6 is connected to the negative terminal of the diode D2, one end of the switch S1, and the temperature detection and stop module. The positive terminal of the diode D2 is grounded. The other end of the switch S1 is connected to the power supply terminal of the inverter U2. The input terminal of the inverter U2 is connected to one end of the capacitor C3 and one end of the resistor R5. The other end of the capacitor C3 is grounded. The output terminal of the inverter U2 is connected to the other end of the resistor R5 and the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the first terminal of the thyristor Z1. The second terminal of the thyristor Z1 is connected to the neutral wire N. The third terminal of the thyristor Z1 is connected to one end of the heater X, and the other end of the heater X is connected to the live wire L.

[0015] As a further embodiment of this utility model: the temperature detection stop module includes resistors R7, R8, and R9, potentiometer RP2, inverter U3, diode D3, and relay J1. Resistor R9 is a thermistor. One end of resistor R7 is connected to one end of resistor R8 and the temperature heating module. The other end of resistor R7 is connected to one end of resistor R9 and the non-inverting input of amplifier U3. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to one end of potentiometer RP2 and the inverting input of amplifier U3. The other end of potentiometer RP2 is grounded. The output terminal of amplifier U3 is connected to one end of relay J1 and the negative terminal of diode D3. The other end of relay J1 is grounded, and the positive terminal of diode D3 is grounded.

[0016] Compared with the prior art, the beneficial effects of this utility model are: this utility model uses a temperature heating module and a temperature detection stop module to assist in completing the IGBT status test, thereby detecting the conduction status of the IGBT under different temperature environments and determining whether the IGBT quality is qualified. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an IGBT operating status detection circuit.

[0018] Figure 2 The circuit diagram for the power-on control module and IGBT module.

[0019] Figure 3 This is a circuit diagram of the temperature heating module and the temperature detection and stop module. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 An IGBT operating status detection circuit includes:

[0022] The conduction control module is used to change the output voltage and control the conduction status of the IGBT module.

[0023] IGBT module, used for IGBT operation;

[0024] Temperature heating module, used to heat the ambient temperature of the IGBT module;

[0025] The temperature detection and stop module is used to disconnect the working circuit of the temperature heating module when the ambient temperature of the IGBT reaches the set value.

[0026] The conduction control module is connected to the IGBT module, the temperature heating module is connected to the IGBT module, and the temperature detection and stop module is connected to the temperature heating module.

[0027] In this embodiment: Please refer to Figure 2The conduction control module includes a resistor R1, a capacitor C1, a voltage regulator U1, a potentiometer RP1, a resistor R2, and a capacitor C2. One end of the resistor R1 is connected to the supply voltage VCC, and the other end of the resistor R1 is connected to one end of the capacitor C1 and the input terminal of the voltage regulator U1. The other end of the capacitor C1 is grounded. The ground terminal of the voltage regulator U1 is connected to one end of the potentiometer RP1, one end of the resistor R2, and one end of the capacitor C2. The other end of the resistor R2 is grounded, and the other end of the capacitor C2 is grounded. The output terminal of the voltage regulator U1 is connected to the other end of the potentiometer RP1 and the IGBT module.

[0028] The voltage output between the ground terminal and the output terminal of the voltage regulator U1 is fixed, that is, the voltage on potentiometer RP1 is fixed. By adjusting the resistance value of potentiometer RP1, the voltage across resistor R2 is changed, which in turn changes the voltage output to the IGBT module (the sum of the voltages on potentiometer RP1 and resistor R2).

[0029] In this embodiment: Please refer to Figure 2 The IGBT module includes an IGBT, resistors R3 and R4, and a voltmeter V. The G terminal of the IGBT is connected to the conduction control module, the C terminal of the IGBT is connected to one end of resistor R4, the E terminal of the IGBT is connected to one end of resistor R3 and one end of voltmeter V, the other end of resistor R4 is connected to the power supply voltage VCC, the other end of resistor R3 is grounded, and the other end of voltmeter V is grounded.

[0030] The conduction status of the IGBT varies depending on the magnitude of the input gate voltage. The conduction performance of the IGBT can be determined by the output current of the IGBT under different temperature environments and different gate voltages. The magnitude of the IGBT output current can be obtained by dividing the value of the voltmeter V by the resistance value of the resistor R3.

[0031] In this embodiment: Please refer to Figure 3 The temperature heating module includes a resistor R6, a diode D2, a switch S1, an inverter U2, a resistor R5, a capacitor C3, a diode D1, a thyristor Z1, and a heater X. One end of the resistor R6 is connected to the power supply voltage VCC, and the other end of the resistor R6 is connected to the negative terminal of the diode D2, one end of the switch S1, and the temperature detection and stop module. The positive terminal of the diode D2 is grounded. The other end of the switch S1 is connected to the power supply terminal of the inverter U2. The input terminal of the inverter U2 is connected to one end of the capacitor C3 and one end of the resistor R5. The other end of the capacitor C3 is grounded. The output terminal of the inverter U2 is connected to the other end of the resistor R5 and the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the first terminal of the thyristor Z1. The second terminal of the thyristor Z1 is connected to the neutral wire N. The third terminal of the thyristor Z1 is connected to one end of the heater X, and the other end of the heater X is connected to the live wire L.

[0032] With switch S1 normally closed, after inverter U2 is powered on, its input is initially at a low level, so its output is high, and capacitor C3 charges. When capacitor C3 reaches a high level, the input of inverter U2 is high, and its output is low. Then, capacitor C3 discharges and becomes low again. This process repeats, generating a PWM signal at the output of inverter U2, which drives thyristor Z1 to conduct, powering heater X to heat the IGBT ambient temperature.

[0033] In this embodiment: Please refer to Figure 3 The temperature detection stop module includes resistors R7, R8, and R9, potentiometer RP2, inverter U3, diode D3, and relay J1. Resistor R9 is a thermistor. One end of resistor R7 is connected to one end of resistor R8 and the temperature heating module. The other end of resistor R7 is connected to one end of resistor R9 and the non-inverting input of amplifier U3. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to one end of potentiometer RP2 and the inverting input of amplifier U3. The other end of potentiometer RP2 is grounded. The output terminal of amplifier U3 is connected to one end of relay J1 and the negative terminal of diode D3. The other end of relay J1 is grounded, and the positive terminal of diode D3 is grounded.

[0034] As the ambient temperature rises, the voltage across resistor R9 increases. When the voltage at the non-inverting input of amplifier U3 is higher than the voltage at the inverting input, amplifier U3 outputs a high level, relay J1 is energized, control switch S1 is opened, and the temperature heating module stops working. The temperature is adjusted by changing the resistance of potentiometer RP2, and the voltage at the gate (G) terminal of the IGBT is adjusted by changing the resistance of potentiometer RP1.

[0035] The working principle of this utility model is as follows: the conduction control module is used to change the output voltage and control the conduction status of the IGBT module; the IGBT module is used for IGBT operation; the temperature heating module is used to heat the ambient temperature of the IGBT module; the temperature detection and stop module is used to disconnect the working circuit of the temperature heating module when the ambient temperature of the IGBT reaches the set value.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An IGBT operating status detection circuit, characterized in that, The IGBT operating status detection circuit includes: The conduction control module is used to change the output voltage and control the conduction status of the IGBT module. IGBT module, used for IGBT operation; Temperature heating module, used to heat the ambient temperature of the IGBT module; The temperature detection and stop module is used to disconnect the working circuit of the temperature heating module when the ambient temperature of the IGBT reaches the set value. The conduction control module is connected to the IGBT module, the temperature heating module is connected to the IGBT module, and the temperature detection and stop module is connected to the temperature heating module.

2. The IGBT operating status detection circuit according to claim 1, characterized in that, The conduction control module includes resistor R1, capacitor C1, voltage regulator U1, potentiometer RP1, resistor R2, and capacitor C2. One end of resistor R1 is connected to the supply voltage VCC, and the other end of resistor R1 is connected to one end of capacitor C1 and the input terminal of voltage regulator U1. The other end of capacitor C1 is grounded. The ground terminal of voltage regulator U1 is connected to one end of potentiometer RP1, one end of resistor R2, and one end of capacitor C2. The other end of resistor R2 is grounded, and the other end of capacitor C2 is grounded. The output terminal of voltage regulator U1 is connected to the other end of potentiometer RP1 and the IGBT module.

3. The IGBT operating status detection circuit according to claim 1, characterized in that, The IGBT module includes an IGBT, resistors R3 and R4, and a voltmeter V. The gate (G) terminal of the IGBT is connected to the turn-on control module, the collector (C) terminal of the IGBT is connected to one end of resistor R4, the emitter (E) terminal of the IGBT is connected to one end of resistor R3 and one end of voltmeter V, the other end of resistor R4 is connected to the power supply voltage VCC, the other end of resistor R3 is grounded, and the other end of voltmeter V is grounded.

4. The IGBT operating status detection circuit according to claim 1, characterized in that, The temperature heating module includes a resistor R6, a diode D2, a switch S1, an inverter U2, a resistor R5, a capacitor C3, a diode D1, a silicon controlled rectifier Z1, and a heater X. One end of the resistor R6 is connected to the power supply voltage VCC, and the other end of the resistor R6 is connected to the negative terminal of the diode D2, one end of the switch S1, and the temperature detection and stop module. The positive terminal of the diode D2 is grounded. The other end of the switch S1 is connected to the power supply terminal of the inverter U2. The input terminal of the inverter U2 is connected to one end of the capacitor C3 and one end of the resistor R5. The other end of the capacitor C3 is grounded. The output terminal of the inverter U2 is connected to the other end of the resistor R5 and the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the first terminal of the silicon controlled rectifier Z1. The second terminal of the silicon controlled rectifier Z1 is connected to the neutral wire N. The third terminal of the silicon controlled rectifier Z1 is connected to one end of the heater X, and the other end of the heater X is connected to the live wire L.

5. The IGBT operating status detection circuit according to claim 4, characterized in that, The temperature detection stop module includes resistors R7, R8, and R9, potentiometer RP2, inverter U3, diode D3, and relay J1. Resistor R9 is a thermistor. One end of resistor R7 is connected to one end of resistor R8 and the temperature heating module. The other end of resistor R7 is connected to one end of resistor R9 and the non-inverting input of amplifier U3. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to one end of potentiometer RP2 and the inverting input of amplifier U3. The other end of potentiometer RP2 is grounded. The output terminal of amplifier U3 is connected to one end of relay J1 and the negative terminal of diode D3. The other end of relay J1 is grounded, and the positive terminal of diode D3 is grounded.