H - Electricity – 05 – B
Patent
H - Electricity
05
B
323/4
H05B 41/392 (2006.01) H02M 5/293 (2006.01) H05B 39/04 (2006.01)
Patent
CA 1263439
MULTIPLEXING APPARATUS FOR PHASE-CONTROL CIRCUITS ABSTRACT OF THE DISCLOSURE Multiplexing apparatus for interconnecting at least one power switching device, connected to a load for control- ling a flow of current through that load from an AC source, with a control circuit for controlling conduction of the at least one switching device, includes: a subcircuit for comparing first and second signals to provide one of first and second output conditions responsive to the first signal being respectively less than and greater than the second signal; a full-wave rectifier for providing both half-cycles of the source AC signal waveform with a common, preselected polarity, as the first signal; a switch subcircuit for providing the second signal at one of first and second reference levels responsive to the state of a first control circuit output; and a resistive divider for attenuating the first signal by a known factor, responsive to the state of another control circuit output. The multiplexing apparatus may also include a power supply subcircuit for providing an operating potential. The full-wave rectifier uses a first comparator and a pair of switches, each realized with at least one controlled-conduction device, to facilitate complete integration of the multiplexing apparatus with the control circuit in an integrated semiconductor circuit.
493907
Bloomer Milton D.
Company General Electric
Eckersley Raymond A.
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