Power supply system of IGBT (Insulated Gate Bipolar Transistor) drive module

Abstract

The invention discloses a power supply system of an IGBT (Insulated Gate Bipolar Transistor) drive module. The power supply system comprises a PWM (Pulse-Width Modulation) modulator, a power switch tube and an inverter transformer, wherein a first initial end tap (T1) of a secondary first coil (B1) is connected with an anode of a first rectification diode (D1); a cathode of the first rectification diode (D1) is connected with one end of a first energy-storage capacitor (C1); the other end of the first energy-storage capacitor (C1) is connected with a first tail end tap (T3); a first middle tap (T2) is connected with a cathode of a second rectification diode (D2); an anode of the second rectification diode (D2) is connected with one end of a second energy-storage capacitor (C2); the other end of the second energy-storage capacitor (C2) is connected with the first tail end tap (T3); and the layout of a rectification and energy-storage capacitor of a secondary second coil (B2) is symmetrical with that of the secondary first coil (B1). According to the power supply system, positive and negative output voltages are mutually isolated in an inverting way, and do not interfere mutually, so that the problem of unbalance of magnetic flow of a transformer is solved, the aim of balance of magnetic flow is achieved, the stability of the power supply system of the IGBT drive module is ensured, and the interior demand of an electric automobile is met.

Description

Technical field: [0001] The invention relates to a power supply system of an IGBT drive module, which is applied to the IGBT drive module in the motor controller of an automobile. Background technique: [0002] At present, the motor controllers of electric vehicles basically use high-power IGBT switches. IGBT switches are the most valuable electronic components at the core, so their protection and reliability are particularly important. IGBT switches must be driven by IGBT drive modules. IGBT The drive module is a special module for driving IGBT, such as figure 1 As shown, it is composed of power supply system, signal processing, fault reporting circuit, IGBT drive circuit and so on. The IGBT drive circuit drives the IGBT switch, and the IGBT drive circuit is controlled by an external microprocessor unit. The IGBT drive circuit sends the guarantee signal to the fault reporting circuit for processing and then outputs it to the microprocessor unit. [0003] The stability of ...

AI Technical Summary

Problems solved by technology

This kind of power supply has the characteristics of simple circuit, but it also has shortcomings. When the negative power supply fails, the positive power supply will fail at the same time and burn out the power supply. It is difficult to meet the internal needs of electric vehicles. In addition, the inverter used in the power supply The magnetic bias phenomenon will appear during the operation of the transformer transformer, which will saturate the electromagnetic field, resulting in a short service life of the inverter transformer and unstable output.

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