WO-2026091373-A1 - DETECTION AND PROTECTION APPARATUS FOR POWER SUPPLY LINE, AND ELECTRICAL CONNECTION DEVICE AND ELECTRIC DEVICE

WO2026091373A1WO 2026091373 A1WO2026091373 A1WO 2026091373A1WO-2026091373-A1

Abstract

Disclosed in the present application are a detection and protection apparatus for a power supply line, and an electrical connection device and an electrical device. The power supply line comprises a first current-carrying line (110) and a second current-carrying line (120). The detection and protection apparatus comprises a switch module (210), a leakage detection module (220), a self-detection path module (230), a fault response module (240) and a trigger module (250), wherein the leakage detection module (220) comprises a first shielding conductor structure (221) and a second shielding conductor structure (222); the self-detection path module (230) comprises a first self-detection unit (231) and a second self-detection unit (232), and the first current-carrying line (110), the first self-detection unit (231), the first shielding conductor structure (221), the second shielding conductor structure (222), the second self-detection unit (232) and the second current-carrying line (120) that are electrically coupled form an open-circuit self-detection path; and the fault response module (240) acquires a leakage signal, or an open-circuit signal generated when the open-circuit self-detection path is open-circuited, and outputs a trip trigger signal, such that the switch module (210) disconnects a power connection.

Inventors

WEI, Xiaolei

Assignees

广东美的制冷设备有限公司

Dates

Publication Date: 20260507
Application Date: 20250313
Priority Date: 20241031

Claims (15)

A power cord detection and protection device, wherein the power cord includes a first current-carrying line and a second current-carrying line, and the detection and protection device includes: The switching module is used to control the power connection between the input and output terminals of the power line; A leakage current detection module includes a first shielded conductor structure covering a first current-carrying line and a second shielded conductor structure covering a second current-carrying line. The first shielded conductor structure is used to collect leakage current signals from the first current-carrying line, and the second shielded conductor structure is used to collect leakage current signals from the second current-carrying line. The first shielded conductor structure includes a first end near the input end of the power line, a second end near the output end of the power line, and a third end located between the first end and the second end. The second shielded conductor structure includes a fourth end near the input end, a fifth end near the output end, and a sixth end located between the fourth end and the fifth end. The third end and the sixth end are connected. The self-test path module includes a first self-test unit and a second self-test unit. The first self-test unit is electrically coupled between the first current-carrying line and the first shielding conductor structure, and the second self-test unit is electrically coupled between the second current-carrying line and the second shielding conductor structure, so that the electrically coupled first current-carrying line, first self-test unit, first shielding conductor structure, second shielding conductor structure, second self-test unit, and second current-carrying line constitute an open-circuit self-test path. The fault response module, electrically coupled to the connection point between the first self-test unit and the first shielded conductor structure, outputs a trip trigger signal in response to the acquisition of the leakage signal or the open-circuit signal generated when the open-circuit self-test path is open; and The trigger module is electrically coupled to the fault response module and the switch module respectively, and is configured to drive the switch module to disconnect the power connection in response to receiving the trip trigger signal.
The detection and protection device according to claim 1 further includes a test module, wherein the test module includes a test switch, one end of which is connected to the second current-carrying line and the other end is connected to the connection point between the second self-test unit and the second shielding conductor structure.
According to the detection and protection device of claim 1 or 2, the first self-test unit includes a first resistor and a second resistor, the first resistor is connected between the first current-carrying line and the first end, and the second resistor is connected between the first current-carrying line and the second end.
According to the detection and protection device of claim 3, the fault response module includes a third resistor, a fourth resistor and a first switching transistor, the third resistor and the fourth resistor are connected in series between the first current-carrying line and the second current-carrying line, the connection point of the third resistor and the fourth resistor is connected to the control pin of the first switching transistor, one switching pin of the first switching transistor is connected to the first terminal and the second terminal, and the other switching pin is connected to the trigger module.
The detection and protection device according to claim 4 further includes a first unidirectional conduction module, wherein the first unidirectional conduction module includes a first diode and a second diode, the first end is connected to the anode of the first diode, the second end is connected to the anode of the second diode, and the cathodes of the first diode and the second diode are both connected to a switch pin of the first switching transistor.
The detection and protection device according to any one of claims 2 to 5, wherein the second self-test unit includes a fifth resistor and a sixth resistor, the fifth resistor being connected between the second current-carrying line and the fourth terminal, and the sixth resistor being connected between the second current-carrying line and the fifth terminal.
The detection and protection device according to claim 6 further includes a second unidirectional conduction module, wherein the second unidirectional conduction module includes a third diode and a fourth diode, the test module further includes a seventh resistor, the other end of the test switch is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the anode of the third diode and the anode of the fourth diode, the cathode of the third diode is connected to the fourth terminal, and the cathode of the fourth diode is connected to the fifth terminal.
According to any one of claims 1 to 7, the detection and protection device further includes a thyristor and a trip coil for generating electromagnetic force to drive the switching module to disconnect the power connection, the first current-carrying line is connected to one end of the trip coil, the other end of the trip coil is connected to the anode of the thyristor, the cathode of the thyristor is connected to the second current-carrying line, and the control electrode of the thyristor is connected to the output terminal of the fault response module.
According to the detection and protection device of claim 8, the trigger module further includes a fifth diode and a sixth diode, the cathode of the thyristor is connected to the anode of the fifth diode and the anode of the sixth diode, the cathode of the fifth diode is connected to the second current-carrying line, and the cathode of the sixth diode is connected to the connection point between the trip coil and the thyristor.
According to the detection and protection device of claim 9, the triggering module further includes a thyristor driving module, the thyristor driving module includes an eighth resistor, a ninth resistor and a first capacitor, the output terminal of the fault response module is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to one end of the ninth resistor, one end of the first capacitor and the control electrode of the thyristor, and the other end of the ninth resistor and the other end of the first capacitor are both connected to the connection point between the thyristor and the fifth diode.
According to any one of claims 8 to 10, the detection and protection device further includes a first varistor connected in parallel with the thyristor.
The detection and protection device according to any one of claims 8 to 11 further includes an indicator module connected in parallel with the silicon controlled rectifier, wherein the indicator module includes a tenth resistor and a light-emitting diode connected in series.
The detection and protection device according to any one of claims 1 to 12 further includes a lightning protection module, wherein the lightning protection module includes a second varistor, and the two ends of the second varistor are respectively connected to the first current-carrying line and the second current-carrying line.
An electrical connection device includes a detection and protection device as described in any one of claims 1 to 13, a housing, and a power cord, wherein the power cord is connected to the housing, and the switch module, the self-test path module, the fault response module, and the trigger module are disposed in the housing.
An electrical device includes a load device and the electrical connection device of claim 14, wherein the output end of the power line is connected to the load device.

Description

Power cord detection and protection devices, electrical connection equipment and electrical equipment Cross-reference of related applications This application claims priority to Chinese Patent Application No. 202411548496.6, filed on October 31, 2024, entitled "Detection and Protection Device for Power Line, Electrical Connection Equipment and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of electrical technology, and in particular to a power line detection and protection device, an electrical connection device, and an electrical appliance. Background Technology A leakage current detector (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power supply line via a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have faced higher safety requirements beyond simply detecting leakage current in the power supply line via the leakage current detection lead; for example, they need to detect whether the leakage current detection lead is open-circuited. Summary of the Invention The purpose of this application is to at least partially solve one of the technical problems existing in the prior art, and to this end, to provide a power cord detection and protection device, electrical connection equipment and electrical equipment, which can enrich the feasibility and flexibility of power cord leakage detection and shielding structure open circuit detection, and help to improve the power supply safety of the power cord. In a first aspect, embodiments of this application provide a power cord detection and protection device, wherein the power cord includes a first current-carrying line and a second current-carrying line, and the detection and protection device includes: a switch module, a leakage current detection module, a self-test path module, a fault response module, and a trigger module, wherein: The switch module is used to control the power connection between the input and output ends of the power line. The leakage current detection module includes a first shielding conductor structure covering the first current-carrying line and a second shielding conductor structure covering the second current-carrying line; the first shielding conductor structure is used to collect the leakage current signal of the first current-carrying line, and the second shielding conductor structure is used to collect the leakage current signal of the second current-carrying line; the first shielding conductor structure includes a first end near the input end of the power line, a second end near the output end of the power line, and a third end located between the first end and the second end; the second shielding conductor structure includes a fourth end near the input end, a fifth end near the output end, and a sixth end located between the fourth end and the fifth end; the third end and the sixth end are connected; The self-test path module includes a first self-test unit and a second self-test unit. The first self-test unit is electrically coupled between the first current-carrying line and the first shielding conductor structure, and the second self-test unit is electrically coupled between the second current-carrying line and the second shielding conductor structure, so that the electrically coupled first current-carrying line, first self-test unit, first shielding conductor structure, second shielding conductor structure, second self-test unit, and second current-carrying line constitute an open-circuit self-test path. The fault response module is electrically coupled to the connection point between the first self-test unit and the first shielded conductor structure, and outputs a trip trigger signal in response to the acquisition of the leakage signal or the open-circuit signal generated when the open-circuit self-test path is open; and The trigger module is electrically coupled to the fault response module and the switch module respectively, and is configured to drive the switch module to disconnect the power connection in response to receiving the trip trigger signal. The power line detection and protection device provided according to the embodiments of this application has at least the following beneficial effects: the first shielding conductor structure in the leakage detection module covers the first current-carrying line, thereby enabling the acquisition of the leakage signal of the first current-carrying line; the second shielding conductor structure in the leakage detection module covers the second current-carrying line, thereby enabling the acquisition of the leakage signal of the second current-carrying line; based on this, by connecting the third end of the middle part of the first shielding conductor structure to the sixth end of the second shielding conductor