Electrical switching device
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United States of America Patent
Stats
-
Mar 12, 1985
Grant Date -
N/A
app pub date -
Apr 5, 1982
filing date -
Aug 4, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Electrical switching device for controlling current flow from an alternating current source (10) and having a main thyristor (14,16) such as a triac or a silicon controlled rectifier connected in series with a load (12) across the source. The control terminal (14c,16c) of the thyristor (14,16) is coupled via a diac (30) to a control signal generating circuit (18) operable to vary the conduction interval of the thyristor (14,16) on each cycle of voltage from the supply (10) by switching the diac (30). A further thyristor (38,42) such as a triac or silicon controlled rectifier is connected to be responsive to the switching of the diac (30) to be itself switched so as to provide a current flow path from the control terminal (14c,16c) of the main thyristor to render the main thyristor insensitive to immediate further control under influence of the diac.
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