WO-2026091368-A1 - LEAKAGE PROTECTION INTEGRATED BOARD AND PCB LAYOUT STRUCTURE THEREOF, AND AIR CONDITIONER

WO2026091368A1WO 2026091368 A1WO2026091368 A1WO 2026091368A1WO-2026091368-A1

Abstract

The present application discloses a leakage protection integrated board and a printed circuit board (PCB) layout structure thereof, and an air conditioner. The leakage protection integrated board comprises a PCB; the PCB is arranged in a device layout region; the device layout region is provided with a first varistor, a silicon-controlled module, a trip driving module, a test module, and an indication module; the first varistor is arranged on a first side edge of the PCB; the silicon-controlled module and the trip driving module are arranged opposite to each other; the test module is arranged between the silicon-controlled module and the trip driving module and is close to the first varistor; the indication module is arranged between the silicon-controlled module and the trip driving module; a detection power supply is connected to the PCB from the first side of the PCB, and a pin of the first varistor is bent towards the first side by a set angle.

Inventors

WEI, Xiaolei
NIU, Liwei
CHEN, DONG

Assignees

广东美的制冷设备有限公司

Dates

Publication Date: 20260507
Application Date: 20250312
Priority Date: 20241031

Claims (11)

A PCB layout structure for an integrated leakage current protection board includes a printed circuit board, wherein the printed circuit board has a component layout area, and a first varistor, a silicon controlled rectifier module, a tripping drive module, a test module and an indicator module are disposed on the component layout area; The first varistor is disposed on the first side edge of the printed circuit board, the thyristor module and the tripping drive module are disposed opposite to each other, the test module is disposed between the thyristor module and the tripping drive module and close to the first varistor, and the indicator module is disposed between the thyristor module and the tripping drive module; The detection power supply is connected to the printed circuit board from the first side of the printed circuit board, and the pin of the first varistor is bent at a set angle toward the first side.
According to the PCB layout structure of claim 1, the first varistor is disposed on the back side of the printed circuit board.
According to the PCB layout structure of claim 1, the pin of the first varistor is bent 90 degrees toward the first side.
According to the PCB layout structure of claim 1, the detection power supply includes a current-carrying line and a shielding line covering the current-carrying line, the shielding line leads out a leakage current detection line, and the current-carrying line and the leakage current detection line are connected to the printed circuit board from the back side of the printed circuit board.
According to the PCB layout structure of claim 4, the thyristor module includes a thyristor drive module and a thyristor unit, wherein the thyristor drive module is disposed on the first side of the thyristor unit.
According to the PCB layout structure of claim 5, at least one protective resistor is further provided on the device layout area, and the at least one protective resistor is provided close to the thyristor driving module for automatically detecting the connectivity between each of the shielding lines.
According to the PCB layout structure of claim 4, a second varistor is further provided on the device layout area, the second varistor is connected to the tripping drive module, and the second varistor is provided on the back side of the printed circuit board.
According to the PCB layout structure of claim 4, the indicator module is disposed on the second side edge of the printed circuit board, the second side being the opposite side of the first side.
According to the PCB layout structure of claim 8, a trip reset button is further provided on the device layout area. The trip reset button is located between the SCR module and the trip drive module and close to the indicator module. The trip reset button is plugged into the printed circuit board.
A leakage current protection integrated board, wherein the leakage current protection integrated board adopts the PCB layout structure as described in any one of claims 1 to 9.
An air conditioner includes multiple current-carrying wires, at least one leakage current detection wire, and a leakage current protection integrated board as described in claim 10, wherein the multiple current-carrying wires and at least one leakage current detection wire are connected to the leakage current protection integrated board.

Description

Integrated leakage current protection board and its PCB layout structure, air conditioner Cross-reference of related applications This application is based on and claims priority to Chinese Patent Application No. 202422660688.8, filed on October 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of leakage current protection, and in particular to an integrated leakage current protection board and its PCB layout structure, and an air conditioner. Background Technology Currently, in order to improve the safety of household appliances, some household appliances are equipped with leakage protection devices at the power supply end, so that the household appliances have leakage protection functions to prevent damage to the household appliances caused by leakage of current in the current-carrying wires, and to prevent electric shock injuries to people caused by leakage. In related technologies, residual current devices (RCDs) typically incorporate a tripping mechanism. When a leakage fault is detected, the tripping drive module activates the mechanism to quickly trip, cutting off power to household appliances and preventing serious malfunctions. During the tripping operation, to prevent the large current generated by the leakage from flowing into the household appliances, the RCD also includes a varistor. This varistor clamps the input voltage of the appliances when a leakage occurs, preventing damage. However, due to the large size of the varistor and the large current flowing through it during a leakage, it is usually not mounted on the circuit board of the RCD, which has limited installation space. This results in a large RCD, making it inconvenient to install on household appliances. Summary of the Invention In view of this, embodiments of this application provide an integrated leakage current protection board and its PCB layout structure, as well as an air conditioner, which aims to achieve leakage current protection function while optimizing the device layout of the leakage current protection device and reducing the size of the leakage current protection device. The technical solution of this application embodiment is implemented as follows: In a first aspect, embodiments of this application provide a PCB (Printed Circuit Board) layout structure for an integrated leakage protection board, including a printed circuit board, wherein the printed circuit board is provided with a device layout area, and a first varistor, a silicon controlled rectifier module, a tripping drive module, a test module and an indicator module are provided on the device layout area; The first varistor is disposed on the first side edge of the printed circuit board, the thyristor module and the tripping drive module are disposed opposite to each other, the test module is disposed between the thyristor module and the tripping drive module and close to the first varistor, and the indicator module is disposed between the thyristor module and the tripping drive module; The detection power supply is connected to the printed circuit board from the first side of the printed circuit board, and the pin of the first varistor is bent at a set angle toward the first side. In some implementations, the first varistor is disposed on the back side of the printed circuit board. In some implementations, the pins of the first varistor are bent 90 degrees toward the first side. In some implementations, the detection power supply includes a current-carrying line and a shielding line covering the current-carrying line, with a leakage current detection line leading out from the shielding line. The current-carrying line and the leakage current detection line are connected to the printed circuit board from the back side of the printed circuit board. In some implementations, at least one protective resistor is also provided on the device layout area, the at least one protective resistor being located close to the thyristor drive module, for automatically detecting the connectivity between the shielding lines. In some embodiments, the thyristor module includes a thyristor drive module and a thyristor unit, wherein the thyristor drive module is disposed on a first side of the thyristor unit. In some implementations, a second varistor is further disposed on the device layout area, the second varistor being connected to the tripping drive module, and the second varistor being disposed on the back side of the printed circuit board. In some implementations, the indicator module is disposed on a second side edge of the printed circuit board, the second side being the opposite side of the first side. In some implementations, a trip reset button is also provided on the device layout area. The trip reset button is located between the SCR module and the trip drive module and close to the indicator module. The trip reset button is plugged into the printed circuit board. Secondly, embodiments of