# US 10,320,223 B2 · Circuit device, power receiving device, and electronic apparatus

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- Number: US 10,320,223 B2
- Document ID: US10320223B2
- Status: Granted
- Kind: B2
- Application number: 15/420,934
- Filed: 2017-01-31
- Published: 2017-08-17
- Granted: 2019-06-11
- Earliest claimed: 2016-02-12
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Kota Onishi
- Web page: https://patentgrep.com/patent/US10320223B2

## CPC

- H02J 7/90: Regulation of charging or discharging current or voltage
- H02J 7/04: Regulation of charging current or voltage
- H02J 50/12: of the resonant type
- H02J 50/90: involving detection or optimisation of position, e.g. alignment
- H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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 circuit device includes a power supply portion that supplies power from a battery to a power supply target, and a control portion that controls the power supply portion. The power supply portion includes a charge pump circuit that steps down a battery voltage VBAT of the battery to a voltage that is m/n times the battery voltage VBAT, and supplies the stepped down voltage to the power supply target from a terminal (n is an integer of one or more, m is an integer of one or more and (n−1) or less). The control portion stops a charge pump operation of the charge pump circuit when a voltage VOUT′ of the terminal satisfies the expression VOUT′>VBAT×m/n.

## Claims

### Claim 1

A circuit device comprising:
a power supply that supplies power from a battery to a power supply target, the power supply including a charge pump circuit that steps down a battery voltage VBAT of the battery to a voltage that is m/n times the battery voltage VBAT, where n is an integer of one or more and m is an integer of one or more and (n−1) or less, and supplies the stepped down voltage to the power supply target from a terminal; and
a processor that controls the power supply, the processor being programmed to stop a charge pump operation of the charge pump circuit when a voltage VOUT′ at the terminal satisfies an expression VOUT′>VBAT×m/n.

### Claim 2 (depends on 1)

The circuit device according to claim 1, further comprising:
a detection circuit to which the battery voltage VBAT and the voltage VOUT′ at the terminal are input and that outputs a detection signal that is activated when the expression VOUT′>VBAT×m/n holds,
wherein the processor is programmed to stop the charge pump operation when the detection signal is activated.

### Claim 3 (depends on 1)

The circuit device according to claim 1, wherein the processor is programmed to stop the charge pump operation by deactivating a switching signal for a charge pump transistor included in the charge pump circuit when the expression VOUT′>VBAT×m/n holds.

### Claim 4 (depends on 1)

The circuit device according to claim 1, wherein the processor is programmed to restart the charge pump operation that has been stopped when a predetermined restart condition is satisfied.

### Claim 5 (depends on 4)

The circuit device according to claim 4, wherein the processor is programmed to restart the charge pump operation that has been stopped when predetermined operation information is input to an input of an electronic apparatus in which the circuit device is included.

### Claim 6 (depends on 1)

The circuit device according to claim 1, wherein the power supply further includes:
a charger that supplies power to the battery so as to charge the battery; and
a discharger that includes the charge pump circuit and performs a discharging operation that supplies power charged to the battery to the power supply target.

### Claim 7 (depends on 6)

The circuit device according to claim 6, wherein the power supply supplies power that has been received by a power receiver through contactless power transmission to the battery so as to charge the battery.

### Claim 8 (depends on 7)

The circuit device according to claim 7, wherein the processor is programmed to:
stop the discharging operation when the power receiver approaches a power transmitter that performs the contactless power transmission; and
cause the discharger to perform the discharging operation in a removed period in which the power receiver is removed from the power transmitter.

### Claim 9 (depends on 6)

A power receiving device comprising:
the circuit device according to claim 6.

### Claim 10 (depends on 1)

An electronic apparatus comprising:
the circuit device according to claim 1.