Switch-mode power supply with burst mode standby operation
October 19, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3590362 3818314 Controlled power supply for a television receiver equipped with remote control Voltage control circuit for a DC-to-DC convertor Flyback type switching power source device Regulated power supply device for a line sweep circuit in a television receiver DC Power supply circuit Switched mode power supply Frequency controlled resonant regulator Two-state switched-mode power supply InventorAssigneeApplicationNo. 424357 filed on 10/19/1989US Classes:363/97, With transistor control means in the line circuit363/19, With automatic control of the magnitude of output voltage or current363/49With starting arrangementExaminersPrimary: Beha, William H. Jr.Assistant: Sterrett, Jeffrey Attorney, Agent or FirmInternational ClassH02M 003/335Foreign Application Priority Data1989-03-07 GBAbstractIn 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.Other References
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