Switch intelligently controls current


Posted on Jul 21, 2012

The circuit in Figure 1 can intelligently control ac or dc current when connected in series with a load. The circuit `steals` its power by turning off the load at a low duty cycle. The switch uses the MOSFETs` parasitic body diode to its advantage. While the MOSFETs are off, the body diodes, along with D1 and D2, serve as two legs of a diode bridge. Current flows through the load and the bridge, charging C1 to the peak ac or dc voltage.



The relatively small control-block supply current continues to flow through the load when the load is turned off. The circuit has low insertion loss because of the MOSFET`s bidirectional nature. The control block connects power to the load by turning




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