In-line electrical switch for AC power supply

Details In-line electrical switch for AC power supply In-line electrical switch for AC power supply

1987-08-28

1989-02-07

Beha, Jr., William H.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

307117, 307632, 323904, 323905, H03K 17945

Patent

active

048034185

ABSTRACT:
A proximity switch e.g. for a domestic a.c. supply is connected in-line e.g. in the live line of the supply between live and switch live terminals. No direct connection is made to the neutral line. Switching is performed by a triac T which receives a gate input 17 from a control circuit K that includes a proximity switch (FIGS. 5, 6). The control circuit K has a power supply comprising a charge storage capacitor C1 that is charged from the live terminal through a first impedance (diodes D3, D4) and a unidirectional first path through diode D1 when the triac T is conductive. When the triac T is switched to a non-conductive state, the capacitor C1 is charged from the switch live terminal through a second unidirectional path including diode D1 and a second impedance R2.

REFERENCES:
patent: 3784843 (1974-01-01), Gustus
patent: 4246533 (1981-01-01), Chiang
patent: 4305006 (1981-12-01), Walhall et al.
patent: 4504778 (1985-03-01), Evans
patent: 4678985 (1987-07-01), Moskin
patent: 4716301 (1987-12-01), Willmott et al.

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