Photo switching device

H - Electricity – 03 – K

Patent

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Details

H03K 17/78 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2354088

A photo switching device includes first and second terminals respectively coupled to a power source and a load. A bi-directional current routing circuit including a rectifying bridge is connected to the first and second terminals to receive electricity from the first and second terminals and has positive and negative output terminals. A switching/driving circuit is connected between the positive and negative output terminals for selectively conducting an output current of the bi-directional current routing circuit from the positive output terminal to the negative output terminal. The switching/driving circuit includes a silicon controlled switching device having a gate coupled to and controlled by a controlling circuit to switch between open condition and closed condition. The controlling circuit includes a photo detecting device connected to a gate of a gate controlled device. The gate controlled device has an output coupled to and controlling the gate of the silicon controlled switching device. When the photo detecting device detects surrounding light, the output of the gate controlled device is switched from a logic high state to a logic low state which in turn changes the silicon controlled switching device from the closed condition to the open condition thereby cutting off the output current from the positive output terminal to the negative output terminal. A variable resistor is connected in serial to the photo detecting device for sensitivity adjustment. A voltage regulation circuit is combined with the controlling circuit in parallel with the photo detecting device for voltage regulation purposes.

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