DC-DC converter
AssigneeSanken Electric Co., Ltd.
InventorTomoyasu Yamada
Life of this patent
Estimating the term…
Abstract
A DC-DC converter is provided with a control circuit 6 which comprises a drive signal generator 11 for producing on-off signals to a control terminal of a MOS-FET 3 in synchronization with pulse signals VOSC from an oscillator 10; an intermittent controller 12 for producing a control signal VC1 to drive signal generator 11 in response to the level of detection signal from an output voltage detector 5 to convert MOS-FET 3 to the intermittent operation during the light load period; and a power control circuit 16 for ceasing power supply VCC to oscillator 10 in response to control signal VC1 from intermittent controller 12 to stop production of pulse signal VOSC from oscillator 10 for the cessation term of MOS-FET 3 during the intermittent operation.
Claims5
A DC-DC converter comprising a primary winding of a transformer and at least one switching element connected in series to a DC power source;
- a secondary winding of the transformer;
- a rectifying smoother connected to the primary or secondary winding of the transformer for supplying DC power to an electric load;
- an output voltage detector for sensing an output voltage to the load to produce a detection signal;
- and a control circuit for receiving the detection signal from the output voltage detector to produce on-off signals to a control terminal of the switching element,
- the control circuit comprising an oscillator for generating pulse signals of a given frequency;
- a drive signal generator for producing on-off signals to the control terminal of the switching element in synchronization with pulse signals from the oscillator;
- an intermittent controller for producing a control signal to the drive signal generator in response to the level of detection signal from the output voltage detector to switch the switching element to the intermittent operation during the light load period;
- and a power control circuit for ceasing power supply to the oscillator in response to the control signal from the intermittent controller.
Dependencies are inferred from the claim text.