Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1992-07-02
1994-05-03
Sterrett, Jeffrey L.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
323238, 323239, 323242, 323324, 323326, G05F 156
Patent
active
053090845
ABSTRACT:
The present invention provides a electronic switch suitable for fading on/off control of electrical equipment like lamps and motors. The main circuit comprises a rectifier bridge circuit and a thyristor. A control circuit includes a fast discharging synchronic integrator and a trigger pulse integrator, the former acts as a pulse phase shifter to provide a self-adapting magnitude variable sawtooth waveform, while the latter acts as a dynamic phase variation memory so as to provide a variable reference for comparison. Trigger pulses which are feed back via the main circuit causes the synchronic integrator to fast discharge. If a control switch is closed, the voltage on the integral capacitor and the trigger angle decreases gradually to produce the fade on. In the fade off process, the conditions are just the opposite. Fading on/off time can be independently set.
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