Switching circuit providing adjustable capacitive series voltage

Details Switching circuit providing adjustable capacitive series voltage Switching circuit providing adjustable capacitive series voltage

1989-06-20

1991-02-12

Shoop, Jr., William M.

Electricity: motive power systems

Series motors

Control by motor circuit impedance

318 66, 388839, H02P 700

Patent

active

049927094

ABSTRACT:
A control circuit for a fractional horsepower fan motor connected between hot and neutral wires in and AC circuit is shown. The control circuit includes two or more duplicate branches. Each branch is serially connected, and each branch includes a triac, series resistor and series capacitor. The triac has a gate terminal which is connected to an optical coupling circuit for isolation and responds to a control signal from a low voltage small current source. In an alternative embodiment, a single triac and optical coupling circuit can be used with different capacitors being switched in or out of the circuit.

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