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
ApplicationNo. 424357 filed on 10/19/1989
US 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 arrangement
ExaminersPrimary: Beha, William H. Jr.
Assistant: Sterrett, Jeffrey
Attorney, Agent or Firm
International ClassH02M 003/335
Foreign Application Priority Data1989-03-07 GB
AbstractIn 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.