Isolated control circuit for alternating current switches

Details Isolated control circuit for alternating current switches Isolated control circuit for alternating current switches

1988-12-07

1990-08-21

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307254, 307270, 323289, H03K 1756, H03K 1760, H03K 301, G05F 140

Patent

active

049509187

ABSTRACT:
A drive circuit controls application of alternating current power to a load. The drive circuit includes an oscillator which applies a high frequency signal to a first input of a logic gate. A control signal is applied to a second input of the gate to enable the gate. A first capacitor is connected to the output of the logic gate. A rectifier connected to the first capacitor rectifies the signal from the first capacitor. A low-pass filter connected to the rectifier removes the high frequency components from the signal. A solid state switch has a switching input connected to the low-pass filter output, which switches the device into a conducting state. This circuit is particularly suited for use where many solid state switches share the same common terminal.

REFERENCES:
patent: 4609980 (1986-09-01), Hoffman
patent: 4837457 (1989-06-01), Bergstrom et al.

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