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US 8,284,578 B2Granted
Power supply apparatus
AssigneeCanon Kabushiki Kaisha
InventorKeisuke Samejima
Life of this patent
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Abstract
The DC power supply apparatus includes a switching operation control part that is provided between a current detection part to detect a current flowing through a primary coil of a transformer and a control part to control the operation of a switching part and controls the operation of the switching part according to an output voltage so that consumption power in a low-load state can be further reduced.
Claims4
A DC power supply apparatus comprising:
- a transformer;
- a switching part that controls a current flowing through a primary coil of the transformer;
- a current detection part that detects the current flowing through the primary coil of the transformer;
- a voltage output part that rectifies and smoothes a voltage of a secondary coil of the transformer and outputs the voltage;
- a detection part that detects a regeneration termination of the secondary coil;
- a comparison part that compares an output voltage from the voltage output part and a reference voltage and outputs a signal according to the comparison result;
- a control part that turns on the switching part based on the detection result of the detection part and an output from the comparison part and turns off the switching part based on an output from the current detection part and the output from the comparison part;
- and
- a switching operation control part that is provided between the current detection part and the control part and controls the operation of the switching part according to the output voltage.
6 more elements
Dependencies are inferred from the claim text.