Power supply circuit using DC/DC converter
AssigneeNXP B.V.
InventorsDave Kroekenstoel, Steven Thoen
Life of this patent
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Abstract
A power supply circuit comprises an input for receiving a power supply from a battery and a DC/DC converter for supplying a converted voltage to a load. A regulator is used for controlling the DC/DC converter such that the current drawn from the converter is smoothed. A charge storage device at the output of the DC/DC converter enables delivery of a non-constant current to the load.
Claims12
A power supply circuit, comprising:
- an input for receiving a power supply from a battery;
- a switched capacitor DC/DC converter for supplying a converted voltage to a load;
- a regulator for controlling the switched capacitor DC/DC converter to reduce a ripple in the current drawn from the switched capacitor DC/DC converter;
- and
- a charge storage device at an output of the switched capacitor DC/DC converter for delivering a non-constant current to the load, wherein the regulator comprises a controller configured to control an output resistance of the switched capacitor DC/DC converter by either adjusting a switching frequency or a capacitance of the switched capacitor DC/DC converter.
The power supply circuit as claimed in any preceding claim, wherein the regulator comprises a current mirror circuit at the output of the switched capacitor DC/DC converter which is fed by a current source.
A power supply method, comprising:
- receiving a power supply from a battery;
- using a switched capacitor DC/DC converter to supply a converted voltage to a load;
- controlling the switched capacitor DC/DC converter to reduce a ripple in a current drawn from the switched capacitor DC/DC converter;
- and
- using a charge storage device at the output of the switched capacitor DC/DC converter to deliver a non-constant current to the load;
- and
- controlling an output resistance of the switched capacitor DC/DC converter by either adjusting a switching frequency or a capacitance of the switched capacitor DC/DC converter.
Dependencies are inferred from the claim text.