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US 7,714,546 B2Granted
Step-up regulator with multiple power sources for the controller
AssigneePanasonic Corporation
InventorsKazuhito Kimura, Takuya Ishii
Life of this patent
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Abstract
An output voltage VC obtained by boosting an input voltage VIN by means of a charge pump control circuit 3 of a charge pump 102 is supplied as a power supply voltage to a control circuit 4 of a step-up converter. It is thus possible to eliminate the need for a conventional self-bias method, eliminate switching from startup oscillation to main oscillation of the conventional self-bias method upon startup, and overcome problems caused by the switching of oscillation states, thereby achieving switching power supply circuitry starting in a reliable and stable manner.
Claims9
Switching power supply circuitry, comprising:
- a step-up converter for switching a DC input voltage by means of a switch element to obtain a DC output voltage boosted from the input voltage,
- a step-up power supply for a control circuit, the step-up power supply for a control circuit for boosting the input voltage and outputting a second boosted voltage, and
- a control circuit supplied with power at the second boosted voltage from the step-up power supply for a control circuit, the control circuit for controlling the switch element of the step-up converter when the second boosted voltage from the step-up power supply for a control circuit is equal to or higher than a predetermined operation start voltage, wherein only the output voltage of the step-up converter is supplied to a load.
Dependencies are inferred from the claim text.