Switch-mode power supply with transformer-coupled feedback

Details Switch-mode power supply with transformer-coupled feedback Switch-mode power supply with transformer-coupled feedback

1989-10-19

1990-06-26

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 19, H02M 3335

Patent

active

049377272

ABSTRACT:
In a switch mode power supply, a first switching transistor is coupled to a primary winding of an isolation transformer. A secondary winding of the transformer is coupled via a switching diode to a capacitor of a control circuit for developing a DC control voltage in the capacitor. The DC level of the control voltage varies in accordance with a supply voltage B+. A change in voltage B+ produces a corresponding, greater change in the control voltage. The control voltage is applied to the transformer when the diode is conducting for producing a pulse-width modulated control signal. The control signal is applied to a mains coupled chopper transistor for generating and regulating the supply voltage B+ in accordance with the pulse width modulation of the control signal.

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