# US 12,009,665 B2 · Photovoltaic system, optimizer, and method for adjusting working state of optimizer

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- Number: US 12,009,665 B2
- Document ID: US12009665B2
- Status: Granted
- Kind: B2
- Application number: 17/825,108
- Filed: 2022-05-26
- Published: 2022-09-08
- Granted: 2024-06-11
- Earliest claimed: 2019-11-27
- Assignees: Huawei Digital Power Technologies Co., Ltd.
- Applicants: Huawei Digital Power Technologies Co., Ltd.
- Inventors: Xiaofeng Yao; Yanzhong Zhang; Guilei Gu
- Web page: https://patentgrep.com/patent/US12009665B2

## CPC

- H02J 3/381: {Dispersed generators}
- H02S 50/00: Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S 40/30: Electrical components
- H02J 1/106: {for load balancing, symmetrisation, or sharing}
- H02J 2101/24: Photovoltaics
- Y02E 10/56: Power conversion systems, e.g. maximum power point trackers
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02S: GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES (obtaining electrical energy from radioactive sources G21H1/12; light sensitive inorganic semiconductor devices H10F; light sensitive organic semiconductor devices H10K30/00; thermoelectric devices H10N10/00; pyroelectric devices H10N15/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A photovoltaic system, an optimizer, a controller, a computer program product, a computer-readable storage medium, a chip, and a method for adjusting a working state of an optimizer are provided. The photovoltaic system includes a photovoltaic panel and an optimizer. The optimizer includes a controller, a first output port, and a second output port. The controller is configured to detect an electrical signal parameter between the first output port and the second output port. The controller is configured to adjust a working state of the optimizer from a no-output state or a limited-output state to an unlimited-output state when the electrical signal parameter changes. In the photovoltaic system, the working state can be adjusted without using an unlocking apparatus, so that an implementation is simple, and costs are reduced.

## Claims

### Claim 1

A photovoltaic system, wherein the photovoltaic system comprises an optimizer, and the optimizer comprises:
a controller,
a first output port,
a second output port, and
an electrical signal parameter conversion unit that further comprises a first port configured to be connected to the first output port of the optimizer, a second port configured to be connected to the second output port of the optimizer, and a first resistor; and
the controller is further configured to adjust the working state of the optimizer from the no-output state or the limited-output state to the unlimited-output state when the controller detects that an impedance value between the first output port and the second output port changes from an impedance value of an internal resistor of the optimizer to an impedance value obtained after the first resistor and the internal resistor of the optimizer are connected in parallel.

### Claim 2

A photovoltaic system, wherein the photovoltaic system comprises an optimizer, and the optimizer comprises:
a controller,
a first output port,
a second output port, and
an electrical signal parameter conversion unit that further comprises a first port configured to be connected to the first output port of the optimizer, a second port configured to be connected to the second output port of the optimizer, a second resistor and a first switch, wherein the second resistor and the first switch are connected in series; and when the first switch is open, an impedance value between the first output port and the second output port is an impedance value of an internal resistor of the optimizer; or when the first switch is closed, an impedance value between the first output port and the second output port is an impedance value obtained after the internal resistor of the optimizer and the second resistor are connected in parallel; and
the controller is further configured to adjust the working state of the optimizer from the no-output state or the limited-output state to the unlimited-output state when the controller detects that the impedance value between the first output port and the second output port changes from the impedance value of the internal resistor of the optimizer to the impedance value obtained after the second resistor and the internal resistor of the optimizer are connected in parallel.

### Claim 3

A photovoltaic system, wherein the photovoltaic system comprises an optimizer, and the optimizer comprises:
a controller,
a first output port,
a second output port, and
an electrical signal parameter conversion unit that further comprises a first port configured to be connected to the first output port of the optimizer, a second port configured to be connected to the second output port of the optimizer, a third resistor and a second switch, wherein the third resistor and the second switch are connected in parallel; and when the second switch is open, an impedance value between the first output port and the second output port is an impedance value obtained after an internal resistor of the optimizer and the third resistor are connected in parallel; or when the second switch is closed, an impedance between the first output port and the second output port is zero; and
the controller is further configured to adjust the working state of the optimizer from the no-output state or the limited-output state to the unlimited-output state when the controller detects that the impedance value between the first output port and the second output port changes, to zero, from the impedance value obtained after the third resistor and the internal resistor of the optimizer are connected in parallel.