Power supply apparatus
AssigneeFujitsu Limited
InventorsHiroshi Shimamori, Ryuichi Yanagisawa, Shinichi Ohtsu
Life of this patent
Estimating the term…
Abstract
The apparatus of the present invention has an interface circuit which returns power in H-level output state, a first power circuit supplying a first supply voltage, and a second power circuit supplying a second supply voltage. The second power circuit receives the entered first supply voltage from the first power circuit, and in a first operation mode (L-level output condition), brings the first supply voltage of 3.3 V down to the second supply voltage of 1.5 V and supplies same to the interface circuit. In a second operation mode (H-level output condition) of the load circuit, a current output from the load circuit is brought up to the first supply voltage of 3.3 V and feeds same back to the first power circuit.
Claims12
A power supply apparatus comprising:
- a load circuit which operates by supply of a prescribed first supply voltage and a second supply voltage different from said first supply voltage, consumes said first supply voltage and said second supply voltage by a load in a first operation mode, and returns said first supply voltage to a supply side of said second supply voltage in a second operation mode;
- a first power circuit which supplies said first supply voltage to said load circuit;
- and
- a second power circuit which receives input of said first supply voltage from said first power circuit, converts said first supply voltage into said second supply voltage and supplies the converted voltage to said load circuit in said first operation mode of said load, and converts a current output from said load circuit into said first supply voltage and feeds back the converted voltage to said first power circuit in the second operation mode of said load circuit, said second power circuit comprises:
- a down-converter which converts said first supply voltage into said second supply voltage and supplies same to said load circuit in said first operation mode of said load circuit,
- an up-converter which converts a current output from said load circuit into said first supply voltage and feeds same back to said first power circuit in the second operation mode of said load circuit, and
- a control circuit which switching-controls each of said down-converter and said up-converter.
Dependencies are inferred from the claim text.