# US 10,871,812 B2 · Power supply circuit and electronic device

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- Number: US 10,871,812 B2
- Document ID: US10871812B2
- Status: Granted
- Kind: B2
- Application number: 16/395,293
- Filed: 2019-04-26
- Published: 2019-12-05
- Granted: 2020-12-22
- Earliest claimed: 2018-05-30
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Hiroshi Shimamori; Kazuya Okamoto
- Web page: https://patentgrep.com/patent/US10871812B2

## CPC

- G06F 1/26: Power supply means, e.g. regulation thereof (for memories G11C)
- H02M 1/10: Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
- H02M 3/1582: {Buck-boost converters (H02M3/1584 takes precedence)}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- 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 circuit includes a first power supply line that couples a first input node from which first input power is input and an output node to each other, a second power supply line that couples a second input node from which second input power is input and the output node to each other, a power limit of the second input power being higher than that of the first input power, a converter that is inserted in the first power supply line and that converts a voltage of the first input power input from the first input node to a higher voltage or a lower voltage, an adjustment circuit that adjusts an output voltage of the converter to a voltage higher than a voltage of the second input power input from the second input node.

## Claims

### Claim 1

A power supply circuit comprising:
a first power supply line that couples a first input node from which first input power is input and an output node to each other;
a second power supply line that couples a second input node from which second input power is input and the output node to each other, a power limit of the second input power being higher than that of the first input power;
a converter that is inserted in the first power supply line and that converts a voltage of the first input power input from the first input node to a higher voltage or a lower voltage;
an adjustment circuit that adjusts an output voltage of the converter to a voltage higher than a voltage of the second input power input from the second input node;
a first rectifier circuit that is inserted in the first power supply line to direct a forward direction of the first rectifier circuit to a direction from the converter to the output node;
a second rectifier circuit that is inserted in the second power supply line to direct a forward direction to a direction of the second rectifier circuit from the second input node to the output node; and
a control circuit that controls a voltage on an output node side of the first rectifier circuit and a voltage on an output node side of the second rectifier circuit to be identical to each other.

### Claim 2 (depends on 1)

The power supply circuit according to claim 1, wherein
the first rectifier circuit includes a first rectifier element that is inserted in the first power supply line to direct a forward direction of the first rectifier element to the direction from the converter to the output node and a first switching element that is coupled in parallel with the first rectifier element,
the second rectifier circuit includes a second rectifier element that is inserted in the second power supply line to direct a forward direction of the second rectifier element to the direction from the second input node to the output node and a second switching element that is coupled in parallel with the second rectifier element, and
the control circuit controls the first switching element and the second switching element to equalize the voltage on the output node side of the first rectifier circuit and the voltage on the output node side of the second rectifier circuit.

### Claim 3 (depends on 1)

The power supply circuit according to claim 1, wherein
the first rectifier circuit includes a first switching element that is inserted in the first power supply line and that contains a body diode,
the second rectifier circuit includes a second switching element that is inserted in the second power supply line and that contains a body diode, and
the control circuit controls the first switching element and the second switching element to equalize the voltage on the output node side of the first rectifier circuit and the voltage on the output node side of the second rectifier circuit.

### Claim 4 (depends on 2)

The power supply circuit according to claim 2, wherein
the control circuit controls the first switching element in a first active region and the second switching element in a second active region close to a saturation region relative to the first active region.

### Claim 5 (depends on 1)

The power supply circuit according to claim 1, further comprising:
a first resistor that is inserted in the first power supply line between the first rectifier circuit and the output node; and
a second resistor that is inserted in the second power supply line between the second rectifier circuit and the output node, wherein
a resistance of the first resistor is greater than a resistance of the second resistor.

### Claim 6

An electronic device comprising:
a power supply circuit; and
a load that operates with power supplied from an output node of the power supply circuit, wherein
the power supply circuit includes
a first power supply line that couples a first input node from which first input power is input and the output node to each other,
a second power supply line that couples a second input node from which second input power is input and the output node to each other, a power limit of the second input power being higher than that of the first input power,
a converter that is inserted in the first power supply line and that converts a voltage of the first input power input from the first input node to a higher voltage or a lower voltage,
an adjustment circuit that adjusts an output voltage of the converter to a voltage higher than a voltage of the second input power input from the second input node,
a first rectifier circuit that is inserted in the first power supply line to direct a forward direction of the first rectifier circuit to a direction from the converter to the output node,
a second rectifier circuit that is inserted in the second power supply line to direct a forward direction of the second rectifier circuit to a direction from the second input node to the output node, and
a control circuit that controls a voltage on an output node side of the first rectifier circuit and a voltage on an output node side of the second rectifier circuit to be identical to each other.

### Claim 7 (depends on 6)

The electronic device according to claim 6, wherein
the load includes
a first buck converter that converts a voltage of the power supplied from the output node to a lower voltage,
a first device to which the power is supplied after the voltage of the power has been converted by the first buck converter to the lower voltage,
a second buck converter that converts a voltage of the power supplied from the output node to a lower voltage, and
a second device to which the power is supplied after the voltage of the power has been converted by the second buck converter to the lower voltage.

### Claim 8 (depends on 7)

The electronic device according to claim 7, wherein
the first device includes a processor, and
the second device includes a memory.

### Claim 9

A PCI card comprising:
a power supply circuit; and
a load that operates with power supplied from an output node of the power supply circuit, wherein
the power supply circuit includes
a first power supply line that couples a card edge from which first input power is input and the output node to each other,
a second power supply line that couples a connector from which second input power is input and the output node to each other, a power limit of the second input power being higher than that of the first input power
a converter that is inserted in the first power supply line and that converts a voltage of the first input power input from the card edge to a higher voltage or a lower voltage,
an adjustment circuit that adjusts an output voltage of the converter to a voltage higher than a voltage of the second input power input from the connector,
a first rectifier circuit that is inserted in the first power supply line to direct a forward direction of the first rectifier circuit to a direction from the converter to the output node,
a second rectifier circuit that is inserted in the second power supply line to direct a forward direction of the second rectifier circuit to a direction from the connector to the output node, and
a control circuit that controls a voltage on an output node side of the first rectifier circuit and a voltage on an output node side of the second rectifier circuit to be identical to each other.

### Claim 10 (depends on 9)

The PCI card according to claim 9, wherein
the load includes
a first buck converter that converts a voltage of the power supplied from the output node to a lower voltage,
a processor to which the power is supplied after the voltage of the power has been converted by the first buck converter to the lower voltage,
a second buck converter that converts a voltage of the power supplied from the output node to a lower voltage, and
a memory to which the power is supplied after the voltage of the power has been converted by the second buck converter to the lower voltage.