Power supply control device and power supply control method
AssigneeFujitsu Semiconductor Limited
InventorTakeshi Hirano
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Abstract
A power supply control device includes a boost type power supply controller boosting an input voltage, a step down power supply controller reducing an output of the boost type power supply controller to output an output voltage, a first control loop including the boost type power supply controller, and a second control loop including the step down power supply controller, wherein the output voltage is controlled by the second control loop during a predetermined period beginning after the power supply control device enters a power-on state, and wherein the output voltage is controlled by the first control loop after the predetermined period passes.
Claims11
A power supply control device comprising:
- a boost type power supply controller boosting an input voltage;
- a step down power supply controller reducing an output of the boost type power supply controller to output an output voltage;
- a first control loop including the boost type power supply controller and monitoring the output voltage;
- and
- a second control loop including the step down power supply controller,
- wherein the output voltage is controlled by the second control loop during a predetermined period beginning after the power supply control device enters a power-on state, and wherein the output voltage is controlled by the first control loop after the predetermined period passes,
- wherein the second control loop includes a switch which becomes a connection state when generating the second control loop and is controlled based on a comparison result between a start voltage and the output voltage feed-backed by the second control loop.
A power supply control method comprising:
- controlling an output voltage with a second control loop having a step down power supply controller;
- reducing an output of a boost type power supply controller via the step down power supply controller;
- boosting an input voltage via the boost type power supply controller;
- outputting the output voltage with a second control loop during a predetermined period beginning at a time a power-on state is entered;
- and
- controlling the output voltage with a first control loop having the boost type power supply controller after the predetermined period passes,
- wherein the second control loop includes a switch which becomes a connection state when generating the second control loop and is controlled based on a comparison result between a start voltage and the output voltage feed-backed by the second control loop.
Dependencies are inferred from the claim text.