# US 8,543,845 B2 · Method for suppressing a voltage fluctuation applying to a load by a second power section with the same or opposite voltage polarity

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- Number: US 8,543,845 B2
- Document ID: US8543845B2
- Status: Granted
- Kind: B2
- Application number: 12/659,729
- Filed: 2010-03-18
- Published: 2010-07-15
- Granted: 2013-09-24
- Earliest claimed: 2007-09-19
- Assignees: Fujitsu Limited
- Applicants: Yoshito Koyama; Minoru Hirahara; Seiji Miyoshi; Eiji Miyachika
- Inventors: Yoshito Koyama; Minoru Hirahara; Seiji Miyoshi; Eiji Miyachika
- Web page: https://patentgrep.com/patent/US8543845B2

## CPC

- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)}
- H02M 1/008: {Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A power supply device includes: a first supply section that supplies power in accordance with an extent of a load in processing in a processing device by applying a voltage to the processing device which processes data; and a second supply section that supplies, to the processing device, power smaller than the supplying power by the first supply section, in accordance with an extent of a load in processing in the processing device to increase and decrease a voltage with respect to the application voltage by the first supply section.

## Claims

### Claim 1

A power supply device comprising:
a detection section;
a first supply section that supplies power in accordance with an extent of a load in processing in a processing device, which processes data, by applying a voltage to the processing device in accordance with an error between an average value of the voltage applied to the processing device and detected by the detection section and a predetermined reference value; and
a second supply section that supplies, to the processing device, power smaller than the supplying power by the first supply section, in accordance with an extent of a load in processing in the processing device to increase and decrease a voltage with respect to the application voltage by the first supply section in accordance with an error between a voltage applied to the processing device and detected by the detection section and the predetermined reference value.

### Claim 2 (depends on 1)

The power supply device according to claim 1, wherein a plurality of the second supply sections are provided.

### Claim 3 (depends on 1)

The power supply device according to claim 1, wherein the processing device includes a plurality of processing sections each of which executes processing; and
the second supply section forms a plurality of groups which correspond to the plurality of processing sections, respectively and which supply power to the plurality of processing sections, respectively.

### Claim 4 (depends on 1)

The power supply device according to claim 1, wherein the second supply section supplies addition power to be added to the power supplied by the first supply section.

### Claim 5 (depends on 1)

The power supply device according to claim 1, wherein the second supply section supplies subtraction power to be subtracted to the power supplied by the first supply section.

### Claim 6

An electronic apparatus comprising:
a processing device that processes data; and
a power supply device that includes:
a detection section;
a first supply section that supplies power in accordance with an extent of a load in processing in a processing device, which processes data, by applying a voltage to the processing device in accordance with an error between an average value of the voltage applied to the processing device and detected by the detection section and a predetermined reference value; and
a second supply section that supplies, to the processing device, power smaller than the supplying power by the first supply section, in accordance with an extent of a load in processing in the processing device to increase and decrease a voltage with respect to the application voltage by the first supply section in accordance with an error between a voltage applied to the processing device and detected by the detection section and the predetermined reference value.