What kind of device does igbt belong to? What are the functions and functions of igbt module?
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What kind of device does igbt belong to? What are the functions and functions of igbt module?

Posted Date: 2024-02-08

What device does igbt belong to?

IGBT (Insulated Gate Bipolar Transistor) is a semiconductor power device. It combines the characteristics of MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and bipolar transistor. IGBTs combine the high input impedance and control capabilities of MOSFETs with the high voltage and high current capabilities of bipolar transistors. Therefore, IGBTs are widely used in high-power and high-voltage power electronics applications.

An IGBT is a bipolar device with three electrodes: gate (G), collector (C) and emitter (E). The gate is used to control the ability of current to flow through the device, the collector is used to withstand high voltage electricity, and the emitter is used to inject current.

The internal structure of IGBT is mainly composed of P-type substrate, N+ region, N region, insulating layer and gate. These structures determine the characteristics and performance of the IGBT, making it a very important device in the field of power electronics.

Characteristics and parameters of IGBT

(1) High switching speed and small switching loss. When the voltage is above 1000V, the switching loss is only 1/10 of GTR, which is equivalent to that of power MOSFET;

(2) When the voltage and current are the same, the safe working area is larger than that of GTR, and it has the ability to withstand pulse current impact;

(3) The on-state voltage drop is lower than that of VDMOSFET, especially in areas with large current;

(4) The input impedance is high and the input characteristics are similar to MOSFET;

(5) Compared with MOSFET and GTR, the voltage resistance and current flow capacity can be further improved while maintaining the characteristics of high switching frequency.

(6) IGBTs are often packaged together with anti-parallel fast diodes to make modules and become reverse conduction devices. Currently there are also multi-tube modules and IPM (IGBT+ control and protection circuit).

The role and function of the igbt module

IGBT module is a packaged device composed of one or more IGBT transistors, drive circuit and protection circuit. IGBT modules are commonly used in high-power applications and have the following roles and functions:

1. Power switch: IGBT module can control high voltage and high current. As a power switch, it is used to control the on and off of the circuit to achieve current control and voltage conversion. It can quickly turn on and off circuits under high voltage and high frequency, thereby achieving efficient energy conversion.

2. Current amplification: IGBT modules have high current carrying capacity and low conduction voltage drop characteristics. They can withstand larger currents and amplify current signals for power transmission and load driving.

3. Circuit protection: IGBT modules usually include protection circuits that monitor parameters such as current, voltage, and temperature to avoid faults such as overcurrent, overvoltage, and overtemperature. It can provide functions such as short circuit protection, overheating protection and overcurrent protection to ensure the safe operation of the equipment.

4. Precise control: The IGBT module can accurately control the switching characteristics of the IGBT transistor through an external drive circuit, and adjust the on and off times according to needs to achieve precise current and power control.

5. Integrated design: IGBT modules integrate multiple IGBT transistors, drive circuits and protection circuits into one package, simplifying circuit design and layout, saving space and cost.

IGBT modules are widely used in a variety of applications, including power transmission and distribution, renewable energy power generation systems, electric vehicle drive systems, industrial motor control, welding equipment, and high-voltage power supplies. By controlling and converting current and voltage, IGBT modules provide efficient, precise, and reliable power control and conversion functions.

Review Editor: Huang Fei


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