Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1986-07-16
1987-08-18
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
323235, 323239, 323242, 363 89, 363 98, H02M 5458
Patent
active
046881611
ABSTRACT:
A power converter for converting 60 Hertz line power to 20 kilohertz power for driving a low voltage incandescent lamp (42). A field effect transistor power switch section (12) is connected through bridge rectifiers (10, 32) for charging a capacitor filter (34) with the AC input power. A 20 kHz oscillator (38) drives a half-bridge inverter (36) for coupling the capactitor voltage to the lamp (42) as high frequency power. The conduction of the FET power switch (12) is controlled by a phase locked loop (16) for synchronizing the conduction with the zero crossing points of the AC cycle. A ramp generator (18) and a summing network (20) are responsive to a lamp intensity control (22) for changing the conduction duty cycle of the FET power switch (12) such that a desired lamp intensity is maintained.
REFERENCES:
patent: 3538418 (1970-11-01), Allington
patent: 3758840 (1973-09-01), Oliver
patent: 4086526 (1978-04-01), Grudelbach
patent: 4528494 (1985-07-01), Bloomer
patent: 4567425 (1986-01-01), Bloomer
Burkhart et al, "Reverse Phase-Controlled Dimmer for Incandescent Lighting," IEEE Trans. on Ind. App's., vol. 1A-15, No. 5, (Sep./Oct. 1979).
Beha Jr. William H.
Vari-Lite Inc.
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