PWM inverter circuit having modulated DC link input

Details PWM inverter circuit having modulated DC link input PWM inverter circuit having modulated DC link input

1989-10-13

1990-06-19

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 41, 363 35, 363 37, H02M 112

Patent

active

049358600

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 DC link modulator comprising a ripple generator which varies the voltage of the DC signal to eliminate short duration switching transients in the PWM pattern. Variation 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. In the preferred embodiment of the invention, an inverter controller provides a synchronizing signal to the ripple generator, which is coupled to a point between the DC source and the inverter.

REFERENCES:
patent: 4387421 (1983-06-01), Zach et al.
patent: 4757434 (1988-07-01), Kawabata et al.
patent: 4800478 (1989-01-01), Takahashi

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