DC-DC conversion circuit suitable for power supply on high-voltage side of IGBT drive module

Abstract

The invention discloses a DC-DC conversion circuit suitable for power supply on a high-voltage side of an IGBT drive module. The circuit comprises a power supply for supplying work voltage, an unsteady-state multivibrator, a control pulse waveshaping circuit, an LC resonance circuit, a high-frequency pulse transformer, a high-voltage side waveshaping filter circuit, a second-level voltage-stabilizing circuit, an output voltage impedance regulation and current amplifying circuit, a seventh diode D7 and an eighth diode D8, wherein the seventh diode D7 and the eighth diode D8 are used for controlling safety power-on time intervals between a first field effect tube Q1 and a second field effect tube Q2 and preventing the situation that the first field effect tube Q1 and the second field effect tube Q2 are simultaneously powered on and accordingly a power supply of a low-voltage side is short-circuited. The invention further comprises a current-limiting circuit which can connect the power supply before current limiting to the drive module needing to provide powerful enough current output capacity for an IGBT and connect the power supply after current limiting to other control units on the high-voltage side of the IGBT drive module. The DC-DC conversion circuit is perfect in function, reliable in performance, convenient to use and easy to popularize and use.

Description

technical field [0001] The circuit of the invention belongs to the field of power electronics, and specifically relates to a DC-DC conversion circuit suitable for supplying power to the high-voltage side of an IGBT (Insulated Gate Bipolar Transistor) drive module. Background technique [0002] The power supply on the high-voltage side of the high-power IGBT driver module usually needs to be electrically isolated to prevent interference from the complex electromagnetic environment on the high-voltage side. Usually half-bridge or push-pull structure is adopted, generally without closed-loop control, some DC-DC conversion circuits add a linear regulated power supply at the output end to realize the stability of the driving voltage, and currently there are DC-DC conversion circuits on the market The IGBT drive modules include the 2SC0435T series of the Swiss CONCEPT company and the 2ED300C17-ST of the German INFINEON company. They are characterized by relatively large power and ...

AI Technical Summary

Problems solved by technology

However, this type of DC-DC conversion circuit has a large number of components, is expensive, and has a large volume. It is not suitable for installation on the surface of the IGBT drive module (the distance between the connecting cable is long), and the reliability is low.

[0003] Since the integrated isolated DC-DC conversion circuit is built into the IGBT drive module, if the power loss is too large during the transmission process, it will cause the transformer coil to heat up, which will seriously cause the instability of the terminal output power supply and affect the IGBT signal transmission and processing unit. bring disturbance

However, a comprehensive analysis of the various current integrated isolation DC-DC conversion circuit schemes has different emphases, but none of the circuit schemes has all the above-mentioned characteristics, so the application of the IGBT drive module is limited, which brings inconvenience to the use.

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