# US 9,882,381 B2 · Photovoltaic inverter

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,882,381 B2
- Document ID: US9882381B2
- Status: Granted
- Kind: B2
- Application number: 14/465,589
- Filed: 2014-08-21
- Published: 2015-03-05
- Granted: 2018-01-30
- Earliest claimed: 2013-09-02
- Assignees: Lsis Co., Ltd.
- Applicants: Lsis Co., Ltd.
- Inventors: Tae Bum Park
- Web page: https://patentgrep.com/patent/US9882381B2

## CPC

- H02M 1/00: Details of apparatus for conversion
- H02J 1/102: being switching converters (H02J1/108, H02J1/12 take precedence)
- Y02E 10/56: Power conversion systems, e.g. maximum power point trackers
- 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)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

This invention relates to a photovoltaic inverter, capable of connecting a plurality of photovoltaic modules to each input port of a multi-string photovoltaic inverter through a single booster. The photovoltaic inverter disclosed herein includes a plurality of input portions connected in series to a plurality of photovoltaic modules, respectively, a plurality of reactors connected in series to the plurality of input portions, respectively, a first capacitor configured to charge DC voltages of the plurality of photovoltaic modules, respectively, transferred through the plurality of input portions, a first resistor connected in parallel to the first capacitor, a booster unit connected in parallel to the first capacitor and the first resistor connected in parallel to each other, and configured to boost the voltages charged in the first capacitor, and an inverter unit configured to convert the voltage boosted by the booster unit into an AC voltage to provide to a grid.

## Claims

### Claim 1

A photovoltaic inverter comprising:
a plurality of reactors connected to a plurality of photovoltaic modules, respectively;
a first capacitor connected to the plurality of reactors, and configured to store DC voltages of the plurality of photovoltaic modules;
a first resistor connected in parallel to the first capacitor;
a booster unit connected to the first capacitor and the first resistor, and configured to boost the voltages stored in the first capacitor; and
an inverter unit configured to convert the voltage boosted by the booster unit into an AC voltage to provide to a grid,
wherein the booster unit comprises:
a switch connected in parallel to the first capacitor and the first resistor;
a diode having an anode connected to an input terminal of the switch; and
a second capacitor having a first terminal connected to a cathode of the diode, and a second terminal connected to an output terminal of the switch.

### Claim 2 (depends on 1)

The photovoltaic inverter of claim 1, further comprising:
a plurality of input portions connected between the plurality of photovoltaic modules and the plurality of reactors, and connected in series to the plurality of photovoltaic modules, respectively.

### Claim 3 (depends on 1)

The photovoltaic inverter of claim 1,
wherein the inverter unit comprises input ports, a number of the input ports depending on a number of the plurality of photovoltaic modules, and
wherein the booster unit is connected to the input ports of the inverter unit.

### Claim 4 (depends on 3)

The photovoltaic inverter of claim 3, wherein the second capacitor is connected to the input ports of the inverter unit.