# US 9,521,323 B2 · Power supply device having boosting circuit and boosting control applicable to electronic devices

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- Number: US 9,521,323 B2
- Document ID: US9521323B2
- Status: Granted
- Kind: B2
- Application number: 14/507,618
- Filed: 2014-10-06
- Published: 2015-04-09
- Granted: 2016-12-13
- Earliest claimed: 2013-10-07
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Genta Otsuka
- Web page: https://patentgrep.com/patent/US9521323B2

## CPC

- H04N 23/65: Control of camera operation in relation to power supply
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H04N 23/811: {by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor}
- H05B 45/38: using boost topology
- H02M 1/009: {having two or more independently controlled outputs (for DC-DC converter with intermediate AC H02M3/33561)}
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A power supply device includes a first load circuit that operates by a first voltage; a second load circuit that operates by a second voltage higher than the first voltage; a boosting circuit that generates the first voltage if the power supply device is in a first driving mode, and generates the second voltage if the power supply device is in a second driving mode; a first feedback circuit that connects the first load circuit and the boosting circuit if the power supply device is in the first driving mode; and a second feedback circuit that connects the first load circuit and the boosting circuit if the power supply device is in the second driving mode. The first load circuit is operated in the first driving mode. The first load circuit and the second load circuit are operated in the second driving mode.

## Claims

### Claim 1

A power supply device comprising:
a first load circuit, including a backlight circuit for a display device having a plurality of light emitting diodes (LEDs), that operates by a first voltage;
a second load circuit that operates by a second voltage higher than the first voltage;
a boosting circuit that generates the first voltage if the power supply device is in a first driving mode, and generates the second voltage if the power supply device is in a second driving mode;
a first feedback circuit that connects the first load circuit and the boosting circuit if the power supply device is in the first driving mode;
a second feedback circuit that connects the first load circuit and the boosting circuit if the power supply device is in the second driving mode; and
a control unit, including a microprocessor, that causes the first load circuit to operate if the power supply device is in the first driving mode, and causes the first load circuit and the second load circuit to operate if the power supply device is in the second driving node,
wherein in the first driving mode,
a detection resistor circuit is selected as a driving circuit for the first load circuit and the first feedback circuit is selected, and
the boosting circuit performs a boosting operation based on an output of the first load circuit, thereby outputting output voltage Vout according to a sum of forward voltages Vf of the plurality of LEDs, resulting in the first load circuit being driven at a constant current; and
wherein in the second driving mode,
a constant-current circuit is selected as a driving circuit for the first load circuit and an output voltage detection circuit and the second feedback circuit is selected
output voltage Vout of the boosting circuit is determined, and
based on a voltage detected by the output voltage detection circuit, the boosting circuit generates output voltage Vout required to drive the second load circuit.

### Claim 2 (depends on 1)

The power supply device according to claim 1, wherein the second load circuit includes a circuit that drives a piezoelectric element.

### Claim 3 (depends on 1)

The power supply device according to claim 1, wherein the power supply device is applied to an imaging device.

### Claim 4 (depends on 1)

The power supply device according to claim 1, wherein the power supply device is applied to an interchangeable lens camera.

### Claim 5 (depends on 1)

The power supply device according to claim 1, wherein the first voltage is about 8 V to 18 V.

### Claim 6 (depends on 1)

The power supply device according to claim 1, wherein the second voltage is 20 V or more.