Frequency controlled preload

Details Frequency controlled preload Frequency controlled preload

1988-09-12

1989-05-16

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, H02M 3335

Patent

active

048315079

ABSTRACT:
A preload for use in a converter whose operating frequency changes with changes in load and/or input voltage. The preload is connected to the converter output to keep the operating frequency above the audible range of frequencies. The time for which the preload is connected to the converter output is inversely related to converter operating frequency. The preload is first connected when the operating frequency decreases to a predetermined frequency which is above the audible range of frequencies. As the operating frequency continues to decrease, the preload is connected for longer periods of time.

REFERENCES:
patent: 4415959 (1983-11-01), Vinciarelli
patent: 4468722 (1984-08-01), Kammiller
patent: 4517633 (1985-05-01), Melcher
patent: 4521842 (1985-06-01), Kammiller
patent: 4587604 (1986-05-01), Nerone
patent: 4626977 (1986-12-01), Carnes et al.
patent: 4691273 (1987-09-01), Kuwata et al.
patent: 4727469 (1983-02-01), Kammiller

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