The difference between IGBT single tube and IGBT module. The working principle and function of IGBT

1. IGBT single tube: IGBT, with smaller packaging than modules, usually has a current below 100A, commonly available in TO247 and other packaging.

2. IGBT module: Modular packaging refers to the integration and packaging of multiple IGBTs together.

IGBT single tube: discrete IGBT, with smaller packaging than modules, usually with a current below 50A, commonly available in TO247 TO3P and other packages.

IGBT module: a modular packaged IGBT chip. Common ones include 1in1, 2in1, 6in1, etc.

The packaging form of IGBT single tube is relatively simple, with only one IGBT transistor, one reverse recovery diode, and an optional temperature sensor, while the packaging form of IGBT module is more complex. In addition to IGBT transistor, reverse recovery diode, temperature sensor, there are also leakage inductance, filtering capacitor, amplifier, control circuit, etc. In addition, the power consumption of IGBT single tubes is lower than that of IGBT modules, but the reliability of IGBT modules is higher.

Working principle and function of IGBT

IGBT is a natural evolution of vertical power MOSFETs for high current, high voltage applications, and fast terminal devices. Due to the need for a source drain channel to achieve a high breakdown voltage BVDSS, which has a high resistivity, MOSFETs with high success rates are characterized by high RDS (on) values, IG.。。 Principle of Replacing High Power IGBT Modules

The working principle of IGBT: Taking DC circuit inversion as a single-phase AC circuit as an example, four IGBTs are used instead of the four diodes in the full bridge rectifier circuit. The difference is that the conduction of IGBTs can be achieved by controlling their bases. If four IGBTs are arranged from top to bottom, the order from left to right is V1, V2, V3, V4; Among them, V1 and V2.

How to choose IGBT

1. Selection of IGBT rated voltage

After rectification and filtering of the three-phase 380V input voltage, the maximum value of the DC bus voltage: under the condition of switch operation, the rated voltage of IGBT is generally required to be higher than twice the DC bus voltage. According to the voltage level of IGBT specifications, IGBT with a voltage level of 1200V is selected.

2. Selection of IGBT rated current

Taking a 30kW frequency converter as an example, the load current is about 79A. Due to current overload during electrical start-up or acceleration of the load, it is generally required to withstand 1.5 times the overcurrent within 1 minute. The maximum load current is about 119A, and it is recommended to choose IGBT with a current level of 150A.

3. Selection of IGBT switch parameters

The switching frequency of a frequency converter is generally less than 10kHz, and in actual operation, the on state loss of IGBT accounts for a relatively large proportion. It is recommended to choose a low-pass IGBT.