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US 2009/0153116 A1Published application
Switching controller and semiconductor device used in the same
AssigneePanasonic Corporation
InventorYoshiaki Hachiya
Life of this patent
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Abstract
According to the present invention, in a switching power supply, a feedback signal from an output voltage detection circuit 6 through a light emitting part 7-1 and a light receiving part 7-2 of a photocoupler 7 is combined with an output voltage signal VA from a tertiary winding 1-3 of a transformer 1, and a composite signal is inputted to an FB terminal of a control circuit 5.
Claims14
A switching controller, comprising:
- a switching element for turning on/off a DC voltage;
- a composite signal generating circuit for generating a composite signal from a plurality of different input signals;
- and
- a control circuit for controlling an on/off operation of the switching element in response to the composite signal from the composite signal generating circuit.
1 more element
A switching controller, comprising:
- an input terminal fed with a DC voltage;
- a transformer comprising a primary winding having one end connected to the input terminal and an other end connected to a high-potential side terminal of a switching element, a secondary winding connected to an output voltage detection circuit via a rectifying/smoothing circuit, and a tertiary winding connected to a composite signal generating circuit connected to an output terminal of the output voltage detection circuit to generate a composite signal;
- and
- a control circuit for controlling an on/off operation of the switching element on the DC voltage in response to the composite signal from the composite signal generating circuit.
1 more element
Dependencies are inferred from the claim text.