# US 12,009,739 B2 · Power supply circuit with high speed response to large rush voltage in power supply

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- Number: US 12,009,739 B2
- Document ID: US12009739B2
- Status: Granted
- Kind: B2
- Application number: 17/684,084
- Filed: 2022-03-01
- Published: 2023-03-30
- Granted: 2024-06-11
- Earliest claimed: 2021-09-24
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Inventors: Chen Kong Teh
- Web page: https://patentgrep.com/patent/US12009739B2

## CPC

- H02M 1/32: Means for protecting converters other than automatic disconnection
- G05F 1/571: with overvoltage detector
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- 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)
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

A power supply circuit in an embodiment includes a first transistor controlled to be turned on and off by a control signal supplied to a gate to output an output voltage following a predetermined voltage, a second transistor, one end of a current path of which is connected to an input terminal for supplying a power supply voltage, the second transistor outputting the predetermined voltage according to the control signal, and an amplifier circuit configured to amplify a voltage difference between a reference voltage and the predetermined voltage, and output the voltage difference as the control signal.

## Claims

### Claim 1

A power supply circuit comprising:
a first transistor controlled to be turned on and off by a control signal supplied to a gate to output an output voltage following a predetermined voltage;
a second transistor, one end of a current path of the second transistor being connected to an input terminal for supplying a power supply voltage, the second transistor outputting the predetermined voltage according to the control signal;
an amplifier circuit configured to amplify a voltage difference between a reference voltage and the predetermined voltage, and output the voltage difference as the control signal;
a third transistor, one end of a current path of the third transistor being connected to an output terminal of the amplifier circuit, another end of the current path of the third transistor being connected to a reference potential point, the third transistor being turned on and off according to a gate voltage; and
a capacitor connected between the input terminal for the power supply voltage and a gate of the third transistor.

### Claim 2 (depends on 1)

The power supply circuit according to claim 1, further comprising:
a charge pump circuit configured to receive an input of the power supply voltage and generate and output a voltage higher than the power supply voltage;
a fourth transistor configured to output an output of the charge pump circuit as the control signal according to an output control signal; and
a fifth transistor configured to output an output of a reference potential point as the control signal according to the output control signal.