Power control with reduced radio frequency interference

Details Power control with reduced radio frequency interference Power control with reduced radio frequency interference

1999-12-23

2000-12-12

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

315302, 315360, 315199, 323271, 323277, G05F 100

Patent

active

061603600

ABSTRACT:
A circuit for controlling the power to a load such as motor or incandescent lamp with reduced radio frequency interference employs a microcontroller to trigger a power transistor into a conductive state for supplying power to the load. The power transistor is switched on and off at a controlled slew rate through an integrator circuit coupled between the microcontroller and the power transistor. A zero current detector circuit detects when no current is passing through the load during each half cycle of the live voltage to switch the power transistor off by generating an interrupt request signal which is supplied to the microcontroller. After an operator selected time interval, the microcontroller generates a signal to switch the transistor to a conductive state.

REFERENCES:
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patent: 4311956 (1982-01-01), Tolmie, Jr.
patent: 4454462 (1984-06-01), Spann
patent: 4823069 (1989-04-01), Callahan et al.
patent: 5243261 (1993-09-01), Bergervoet et al.
patent: 5248919 (1993-09-01), Hanna et al.
patent: 5319301 (1994-06-01), Callahan et al.
patent: 5798581 (1998-08-01), Keagy et al.
patent: 5841246 (1998-11-01), Manders
patent: 5861720 (1999-01-01), Johnson

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