US 12,500,546 B2Granted

Protection circuit for preventing misconnection at input end and photovoltaic power generation system

AssigneeHuawei Technologies Co., Ltd.

InventorsXiufeng Zhang, Yanzhong Zhang, Guangchao Yan, Fangpo Zhang, Xiaokang Tian

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Abstract

This application discloses a protection circuit for preventing a misconnection at an input end and a photovoltaic power generation system, and relates to the field of power electronics technologies. The protection circuit includes an input end, a misconnection detection unit, a mechanical interlocking unit, and a switch unit. The input end is configured to connect to an output end of a direct current power supply. A first input end of the misconnection detection unit is connected to a first port of the input end, and a second input end of the misconnection detection unit is connected to a second port of the input end. An output end of the misconnection detection unit is coupled to the mechanical interlocking unit. The mechanical interlocking unit is connected to the switch unit. A first end of the switch unit is configured to connect to the input end, and a second end of the switch unit is configured to connect to a next circuit. The misconnection detection unit is configured to: when connection wires of the first port and the second port are incorrect, control the mechanical interlocking unit to keep the first end of the switch unit and the second end of the switch unit in a disconnected state. When positive and negative poles of a power supply connected to the input end are misconnected, the protection circuit can be used to prevent a circuit from being affected by the misconnection.

Claims19

Dependent claims

a first input end of the electromagnetic apparatus is connected to a first port of the input end of the protection circuit, a second input end of the electromagnetic apparatus is connected to a second port of the input end of the protection circuit, and an output end of the electromagnetic apparatus is coupled to the mechanical interlocking apparatus;
the mechanical interlocking apparatus is connected to the switch circuit;
a first end of the switch circuit is configured to connect to the input end of the protection circuit, and a second end of the switch circuit is connected to a next circuit;
the electromagnetic apparatus is configured to:
when connection wires of the first port and the second port are incorrect, control the mechanical interlocking apparatus to keep the first end of the switch circuit and the second end of the switch circuit in a disconnected state;
and
wherein the electromagnetic apparatus comprises a detection circuit and a control circuit;
the detection circuit is configured to detect an electrical parameter between the first port and the second port, wherein the electrical parameter comprises at least one of the following:
a voltage, a current, and impedance;
and
the control circuit is configured to:
compare the electrical parameter with a corresponding preset threshold, and when determining, based on a comparison result, that the connection wires of the first port and the second port are incorrect, control the mechanical interlocking apparatus to keep the first end of the switch circuit and the second end of the switch circuit in a disconnected state.

9 more elements

A protection circuit for preventing a misconnection at an input end of the protection circuit, wherein the protection circuit comprises the input end of the protection circuit, an electromagnetic apparatus, and an external power supply, the input end of the protection circuit is connected to an output end of a direct current power supply, and the input end of the protection circuit comprises a first port and a second port;

a first input end of the electromagnetic apparatus is connected to the first port of the input end of the protection circuit, and a second input end of the electromagnetic apparatus is connected to the second port of the input end of the protection circuit;
the external power supply and an auxiliary switch are first connected in series and then connected in parallel between the first port and the second port, and a positive output end of the external power supply is connected to the first port;
the electromagnetic apparatus is configured to:
detect impedance between the first port and the second port, and when the impedance is greater than a preset threshold, determine that connection wires of the first port and the second port are incorrect;
and
further comprising a mechanical interlocking apparatus and a switch circuit, wherein
the electromagnetic apparatus comprises an impedance network circuit, an impedance detection circuit, and a control circuit;
a first end of the impedance network circuit is connected to the first port, and a second end of the impedance network circuit is connected to the second port;
an output end of the electromagnetic apparatus is coupled to the mechanical interlocking apparatus, and the mechanical interlocking apparatus is connected to the switch circuit;
the impedance detection circuit is configured to obtain the impedance between the first port and the second port;
a first end of the switch circuit is configured to connect to the input end of the protection circuit, and a second end of the switch circuit is configured to connect to a next circuit;
and
the control circuit is configured to control to power off the mechanical interlocking apparatus when the impedance is greater than the preset threshold, and when the mechanical interlocking apparatus is powered off, the switch circuit is kept in a disconnected state.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/080,112Filed 13 Dec 2022 · continuation
Priority: 15 Jun 2020
Published: US 2023/0104392 A16 Apr 2023
Granted: 16 Dec 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02H 11/003
In case of inverted polarity or connection; with switching for obtaining correct connection: using a field effect transistor as protecting element…
H02S 40/34
Electrical components: comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
H01R 13/6683
With built-in electronic circuit: with built-in sensor
H01R 13/713
With built-in switch: the switch being a safety switch