Dimmer with reduced filtering losses

Details Dimmer with reduced filtering losses Dimmer with reduced filtering losses

1992-01-21

1993-01-12

Dzierzynski, Paul M.

Electric lamp and discharge devices: systems

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

315DIG4, 315283, 315209R, 315225, 315244, 315199, 315226, 323300, 323324, 323326, 323905, 307632, G05F 502

Patent

active

051793245

ABSTRACT:
A dimmer with reduced filtering losses is connected into a conductor supplying power to a load from a mains power supply. It conventionally comprises a triac in series with a filter inductor between an input terminal and an output terminal and a circuit generating triggering signals for the triac. To reduce the losses in the inductor, which conventionally is in series with the load at all times but is active only during moments following triggering of the triac, to reduce the amplitude of the transient currents, a second triac triggered by a circuit with a time-delay greater than the time constant defined by the filter capacitor and inductor diverts the load current. An auxiliary low-value inductor attenuates transients due to triggering of the second triac.

REFERENCES:
patent: 4876498 (1989-10-01), Luchaco et al.
patent: 4954768 (1990-09-01), Luchaco et al.

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