Phase controlled dimming system with active filter for preventin

Details Phase controlled dimming system with active filter for preventin Phase controlled dimming system with active filter for preventin

1997-10-02

2000-07-18

Wong, Don

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315291, 315307, 315DIG4, G05F 100

Patent

active

060912057

ABSTRACT:
A phase controlled dimming system having an active filter for receiving the AC line voltage waveform, and for recovering the AC fundamental waveform therefrom is disclosed. The recovered AC fundamental waveform is supplied to a zero crossing detector that provides zero crossing indications of the AC fundamental waveform. The recovered AC fundamental is substantially free of noise or distortion, and of frequency components greater than at least second order harmonics, that may be present on the AC line voltage waveform, and that might otherwise result in faulty or incorrect zero crossing detection. An output of the zero crossing detector is supplied to a microprocessor that controls the gating of a controllably conductive device interposed between the controlled load and the AC source based on the zero crossing information. The filter may take an analog or digital (software) form.

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patent: 5650694 (1997-07-01), Jayaraman et al.
Horowitz, P. et al., "Active Filters and Oscillators", The Art of Electronics, second edition, 1991, Chapter 5, 272-275.

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