Apparatus and technique for connecting a source of zero crossing

Details Apparatus and technique for connecting a source of zero crossing Apparatus and technique for connecting a source of zero crossing

1992-10-02

1995-04-25

Wolfe, Willis R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327451, H03K 5153, H03K 1713

Patent

active

054101930

ABSTRACT:
An arrangement for controlling a zero crossing switch in order to connect a source of zero crossing AC voltage to and disconnecting it from an AC load line is disclosed herein along with its method of operation. To this end, means are provided for producing externally controlled command signals intended to control when the switch connects and disconnects the load line to and from the AC voltage. At the same time, a specific window of time is selected, which window begins a particular period of time prior to and includes at least certain zero crossing points of the AC voltage. Internally controlled command signals are produced in response to the AC voltage and externally controlled signals for actually controlling when the switch connects (ON) and disconnects (OFF) the load to and from the AC voltage. These internally controlled signals are produced such that either an ON or OFF signal, but not both, is produced entirely throughout the specific window of time in order to prevent command signals from switching between ON and OFF states within any given window of time. This, in turn, reduces current surges at the output of the zero crossing switch, thereby reducing electromagnetic interference (EMI).

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