Switching power supply circuit
AssigneeRohm Co., Ltd.
InventorSatoru Nate
Life of this patent
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Abstract
Provided is a switching power supply circuit including an output transistor arranged to be turned on and off to generate a desired output voltage from a pulsating voltage obtained by rectifying an AC input voltage, an oscillator arranged to generate an ON signal at a switching frequency varying periodically in synchronization with the AC input voltage or the pulsating voltage, a controller arranged to generate an OFF signal so that the output voltage is adjusted to a target value while a power factor becomes close to one, a logic circuit arranged to generate a switch control signal in accordance with the ON signal and the OFF signal, and a driver arranged to turn on and off the output transistor in accordance with the switch control signal.
Claims10
A switching power supply circuit, comprising:
- an output transistor arranged to be turned on and off for generating a desired output voltage from a pulsating voltage obtained by rectifying an AC input voltage;
- an oscillator arranged to generate an ON signal at a switching frequency varying periodically in synchronization with the AC input voltage or the pulsating voltage;
- a controller arranged to generate an OFF signal so that the output voltage is adjusted to a target value while a power factor becomes close to one;
- a logic circuit arranged to generate a switch control signal in accordance with the ON signal and the OFF signal;
- and
- a driver arranged to turn on and off the output transistor in accordance with the switch control signal.
Dependencies are inferred from the claim text.