PWM inverter circuit having a filtered fundamental feedback DC l

Details PWM inverter circuit having a filtered fundamental feedback DC l PWM inverter circuit having a filtered fundamental feedback DC l

1989-10-13

1990-06-19

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 35, 363 37, 363 41, H02M 112

Patent

active

049358596

ABSTRACT:
This invention relates to a VSCF system for aircraft power generation having a DC source, the DC source producing a substantially constant voltage DC signal. An inverter is coupled to the DC source and receives the DC signal, applying a PWM pattern of switching transients to the DC signal to produce an AC signal from the DC signal. The subject invention contemplates the addition of a feedback circuit which comprises a transformer providing an inductive coupling between the AC signal at a point of regulation and the DC signal at a point between the DC source and the inverter to eliminate short duration switching transients in the PWM pattern. Modulation of the DC signal allows short duration switching transients in the PWM pattern to be lengthened, thereby avoiding physical minimum time switching limitations in the switches of the inverter. Feedback of the AC signal allows inverter frequency to be changed while maintaining synchronization between the DC signal modulation and PWM pattern fed to the inverter.

REFERENCES:
patent: 4387421 (1983-06-01), Zach et al.
patent: 4480299 (1984-10-01), Muto et al.
patent: 4800478 (1989-01-01), Takahashi

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