High efficiency power converter employing a synchronized switchi

Details High efficiency power converter employing a synchronized switchi High efficiency power converter employing a synchronized switchi

1990-01-23

1991-12-10

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323286, 323288, H02M 3157

Patent

active

050721712

ABSTRACT:
A synchronized switching system for use in a power converter. A pulse-width modulation controller is provided to alternately turn on and off a switching device and control the on/off duty cycle. When the switching device is turned off, initial commutating or flyback current from an inductor is conducted by a protective diode connected to ground. The diode is paralleled by a more efficient secondary switching device that is synchronized to conduct during the nonconduction period of a main switching device. A sense winding is added on the inductor for synchronizing the secondary switching device. A digital logic circuit controls the conduction time of the secondary switching device based on signals from a pulse-width modulation controller and from the sense winding of the inductor. After the main switching device has been conducting for the required time, the pulse-width modulation controller turns it off. The digital logic circuit senses the voltage level on the inductor and causes the secondary switching device to conduct, just after the main switching device stops conducting. The digital logic circuit prevents the main and secondary switching devices from conducting simultaneously.

REFERENCES:
patent: 3621372 (1971-11-01), Paine
patent: 4727308 (1988-02-01), Huljak et al.

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