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

Leave Comment

characters left:

New Circuits



Popular Circuits

Door electronic lock with Keypad
Electro harmonix graphic equalizer circuit
audio bandpass filter
dual power supply circuit
Tone Controls
Automatic Night Lamp Circuit PCB
Dash Instrument Testing
Compact High-Performance 12V 20W Stereo Amplifier
Vacuum tube audio amplifier
MIC2298 LED driver circuit diagram
Variable gain differential amplifier circuit diagram A709