Synchronized switch-mode power supply

Details Synchronized switch-mode power supply Synchronized switch-mode power supply

1989-10-19

1990-07-10

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 19, H02M 3335

Patent

active

049410784

ABSTRACT:
In a switch mode power supply, a first switching transistor is coupled to a primary winding of an isolation transformer. A second switching transistor periodically applies a low impedance across a second winding of the transformer that is coupled to an oscillator for synchronizing the oscillator to the horizontal frequency. A third 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 that varies in accordance with a supply voltage B+. The control voltage is applied via the transformer to a pulse width modulator that is responsive to the oscillator output signal 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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