# US 2020/0287477 A1 · Power conditioner

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- Number: US 2020/0287477 A1
- Document ID: US20200287477A1
- Status: Published application
- Kind: A1
- Application number: 16/792,280
- Filed: 2020-02-16
- Published: 2020-09-10
- Earliest claimed: 2019-03-05
- Assignees: OMRON Corporation
- Applicants: OMRON Corporation
- Inventors: Takao MIZOKAMI
- Web page: https://patentgrep.com/patent/US20200287477A1

## CPC

- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 7/53871: {with automatic control of output voltage or current}
- H02M 1/126: {using passive filters}
- H02M 7/5387: in a bridge configuration
- 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: 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

The power conditioner includes: a reactor; a capacitor; a first switching circuit that alternately switches, at a first frequency, between a first state where the DC current supplied from the DC power source is supplied to the reactor and supply of the DC current to the capacitor is shut off and a second state where an electric current is supplied to the capacitor from the reactor in which energy is accumulated by the supply of the DC current and the electric current from the DC power source to the reactor is shut off; and a second switching circuit that alternately switches, at a second frequency, between a first direction in which an electric current supplied from the capacitor flows toward a second output terminal through a first output terminal and a second direction in which the electric current flows toward the first output terminal through the second output terminal.

## Claims

### Claim 1

A power conditioner that converts a DC current from a DC power source into an AC current and outputs the AC current from an output terminal, the power conditioner comprising:
a reactor;
a capacitor;
a first switching circuit that alternately switches, at a first frequency, between a first state where the DC current supplied from the DC power source is supplied to the reactor and a supply of the DC current to the capacitor is shut off and a second state where an electric current is supplied to the capacitor from the reactor in which an energy is accumulated by the supply of the DC current and an electric current from the DC power source to the reactor is shut off; and
a second switching circuit that alternately switches, at a second frequency, between a first direction in which an electric current supplied from the capacitor flows toward a second output terminal through a first output terminal and a second direction in which the electric current flows toward the first output terminal through the second output terminal.

### Claim 2 (depends on 1)

The power conditioner according to claim 1,
wherein a duty Don in the first state where switching is performed at the first frequency is determined from Expression (1), when V1 represents a voltage of the DC power source, V2 represents a voltage of the capacitor, and f represents the second frequency.
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### Claim 3 (depends on 1)

The power conditioner according to claim 1, further comprising:
a controller that controls the switching performed by the first switching circuit and the second switching circuit.

### Claim 4 (depends on 1)

The power conditioner according to claim 1,
wherein the second switching circuit comprises:
a plus wire and a minus wire which are connected to a plus-side terminal and a minus-side terminal of the DC power source, respectively;
a first leg that is disposed between the plus wire and the minus wire and connects a first switching element and a second switching element in series;
a second leg that is disposed between the plus wire and the minus wire to be closer to the DC power source than the first leg and connects a third switching element and a fourth switching element in series,
a first output wire having one end connected to a first in-leg wiring which connects the first switching element and the second switching element of the first leg;
a second output wire having one end connected to a second in-leg wiring which connects the third switching element and the fourth switching element of the second leg; and
a first smoothing circuit that is disposed between the first output wire and the second output wire and smooths a voltage between the first output wire and the second output wire; and
wherein the first switching circuit comprises:
the capacitor that is disposed between the plus wire and the minus wire and is disposed closer to the DC power source than the second leg;
the reactor that is disposed between the plus wire and the minus wire and is disposed closer to the DC power source than the capacitor;
a fifth switching element that is disposed on the plus wire and between the DC power source and a first connection point at which the plus wire is connected to the reactor; and
a sixth switching element that is disposed on the minus wire and between a second connection point at which the minus wire is connected to the reactor and a third connection point at which the minus wire is connected to the capacitor.

### Claim 5 (depends on 4)

The power conditioner according to claim 4, further comprising:
a second smoothing circuit that is disposed between the plus wire and the minus wire to be closer to the DC power source than the reactor and smooths a voltage between the plus-side terminal and the minus-side terminal of the DC power source.

### Claim 6 (depends on 2)

The power conditioner according to claim 2, further comprising:
a controller that controls the switching performed by the first switching circuit and the second switching circuit.

### Claim 7 (depends on 6)

The power conditioner according to claim 6,
wherein the second switching circuit comprises:
a plus wire and a minus wire which are connected to a plus-side terminal and a minus-side terminal of the DC power source, respectively;
a first leg that is disposed between the plus wire and the minus wire and connects a first switching element and a second switching element in series;
a second leg that is disposed between the plus wire and the minus wire to be closer to the DC power source than the first leg and connects a third switching element and a fourth switching element in series,
a first output wire having one end connected to a first in-leg wiring which connects the first switching element and the second switching element of the first leg;
a second output wire having one end connected to a second in-leg wiring which connects the third switching element and the fourth switching element of the second leg; and
a first smoothing circuit that is disposed between the first output wire and the second output wire and smooths a voltage between the first output wire and the second output wire; and
wherein the first switching circuit comprises:
the capacitor that is disposed between the plus wire and the minus wire and is disposed closer to the DC power source than the second leg;
the reactor that is disposed between the plus wire and the minus wire and is disposed closer to the DC power source than the capacitor;
a fifth switching element that is disposed on the plus wire and between the DC power source and a first connection point at which the plus wire is connected to the reactor; and
a sixth switching element that is disposed on the minus wire and between a second connection point at which the minus wire is connected to the reactor and a third connection point at which the minus wire is connected to the capacitor.

### Claim 8 (depends on 7)

The power conditioner according to claim 7, further comprising:
a second smoothing circuit that is disposed between the plus wire and the minus wire to be closer to the DC power source than the reactor and smooths a voltage between the plus-side terminal and the minus-side terminal of the DC power source.