| 摘要 |
Multiplexing apparatus interconnects at least one power switching device, itself connected to a load for controlling of flow of current through that load from an AC source, with a control circuit for controlling conduction of the switching device(s). The multiplexing apparatus uses a full-wave rectifier for providing both half-cycles of the source AC signal waveform, transformed to have a common preselected polarity, with a first DC level to obtain zero crossing information for determining the start of switching device conduction. The same comparator is utilized with a level switch, now providing a second DC level, and a resistive divider for attenuating the voltage across the conducting switching device by a known factor, for monitoring the switching device saturation voltage during conduction. The apparatus may also include a power supply subcircuit, for providing an operating potential to a completely integrated semiconductor circuit containing this apparatus.
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