An intermediate frequency inverter circuit controlled by spwm two-frequency interleaving drive

Abstract

The invention provides an SPWM two divided-frequency staggered drive control intermediate frequency inversion circuit. The intermediate frequency inversion circuit comprises an inverter bridge, a DC input filter circuit, an AC output filter circuit, two divided-frequency staggered distribution circuits and a drive circuit; the DC input filter circuit, the AC output filter circuit, the two divided-frequency staggered distribution circuit and the drive circuit are connected with the inverter bridge; the inverter bridge comprises four IGBT tube groups, each IGBT tube group comprises two IGBT tubes connected in parallel, the two divided-frequency staggered distribution circuits comprise four groups and are respectively connected with the four IGBT tube groups, and each group of the two divided-frequency staggered distribution circuits is used to enable a high-frequency SPWM drive signal to alternatively drive the two IGBT tubes, connected in parallel, of the corresponding IGBT tube group. The IGBT tubes do not needs to be used in a derating manner, and a current equalizing problem when multiple IGBT tubes are used in a parallel connection manner does not need to be considered. The drive circuit of the IGBT tubes does not need to be specially designed, and high-frequency working of an IGBT power switch can be achieved. The carrier frequency ration of the SPWM inversion circuit can be improved, the output waveform distortion degree and an output voltage harmonic wave are effectively reduced, and working noises are significantly reduced.

Description

technical field [0001] The invention relates to the field of intermediate frequency static variable power supplies, in particular to an intermediate frequency inverter circuit controlled by SPWM two-frequency division and interleaving drive control. Background technique [0002] The intermediate frequency static variable power supply is a kind of power supply for aviation and military use. It is a power supply specially designed and manufactured for aviation and military electronic and electrical equipment. Usually, the output phase voltage is 115V and the output frequency is 400Hz. Also need 300-800Hz or 1000HZ full frequency range of AC power. It is used for aircraft and airborne equipment, radar, navigation and other military electronic equipment, as well as other experimental occasions that need to simulate aircraft onboard power supply. It must have the characteristics of high performance and high reliability. The typical indicators are: small output waveform distortio...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes an intermediate frequency inverter circuit controlled by a SPWM two-frequency division interleaving drive to solve the problems in the prior art that when the carrier frequency is low, the output waveform is distorted, the output voltage harmonics and the distortion rate are high; and when the carrier frequency is high, the IGBT Problems requiring derating

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