Switch-mode power supply with burst mode standby operation

Details Switch-mode power supply with burst mode standby operation Switch-mode power supply with burst mode standby operation

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, 363 49, H02M 3335

Patent

active

049377280

ABSTRACT:
In a switch mode power supply, a first switching transistor is coupled to a primary winding of a transformer for generating pulses of a switching current. A secondary winding of the transformer is coupled via a switching diode to a capacitor of a control circuit for developing a control signal in the capacitor. The control signal is applied to a mains coupled chopper second transistor for generating and regulating supply voltages in accordance with pulse width modulation of the control signal. During standby operation, the first and second transistors operate in a burst mode that is repetitive at a frequency of the AC mains supply voltage such as 50 Hz. In the burst mode operation, during intervals in which pulses of the switching current occur, the pulse width and peak amplitude of the switching current pulses progressively increase in accordance with the waveform of the mains supply voltage to provide a soft start operation in the standby mode of operation within each burst group.

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A schematic diagram of a power supply module AZB5000 of a television receiver power supply publ. by Siemens Co., Jan. 1974.
A data sheet dated Jan. 1986 for an integrated circuit, TEA2162, publ. by Thomson Semiconductors, France.

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