Earth leakage protection integrated board, PCB layout structure thereof and air conditioner

Abstract

The utility model discloses an electric leakage protection integrated board, a PCB layout structure thereof and an air conditioner, the electric leakage protection integrated board comprises a printed circuit board, the printed circuit board is provided with a device layout area, and the device layout area is provided with a first piezoresistor, a silicon controlled rectifier module, a tripping driving module, a test module and an indication module; the first piezoresistor is arranged at the edge of the first side of the printed circuit board, the silicon controlled module and the tripping driving module are oppositely arranged, the test module is arranged between the silicon controlled module and the tripping driving module and is close to the first piezoresistor, and the indication module is arranged between the silicon controlled module and the tripping driving module; wherein 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 piezoresistor is bent towards the first side by a set angle. The first piezoresistor is arranged at the edge of the printed circuit board and is bent towards the outer side of the printed circuit board, so that the device layout space of the printed circuit board is not occupied, and the size of the leakage protection device is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of leakage protection, and in particular to an integrated leakage protection board and its PCB layout structure, and an air conditioner. Background Art

[0002] At present, 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 the leakage of the current-carrying lines of the household appliances from damaging the household appliances and causing electric shock injuries to people.

[0003] In the related art, the leakage protection device is usually provided with a tripping mechanism. When a leakage fault is detected, the tripping drive module drives the tripping mechanism to trip quickly, so that the household appliance is powered off to avoid serious faults. During the operation of the tripping mechanism, in order to prevent the large current generated by the leakage from flowing into the household appliance, the leakage protection device is also provided with a varistor, which is used to clamp the input voltage of the household appliance when leakage occurs to prevent damage to the household appliance. However, due to the large size of the varistor and the large current flowing into the varistor when leakage occurs, the varistor is usually not provided on the circuit board of the leakage protection device where the device installation space is limited. As a result, the leakage protection device is large in size, which is not conducive to installation on the household appliance. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a leakage protection integrated board and its PCB layout structure, and an air conditioner, aiming to achieve the leakage protection function while optimizing the device layout of the leakage protection device and reducing the volume of the leakage protection device.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a PCB layout structure of a leakage protection integrated board, including a printed circuit board, wherein the printed circuit board is provided with a device layout area, and a first varistor, a thyristor module, a tripping drive module, a test module, and an indication module are provided on the device layout area;

[0007] The first varistor is arranged at a first side edge of the printed circuit board, the thyristor module and the tripping drive module are arranged opposite to each other, the test module is arranged between the thyristor module and the tripping drive module and close to the first varistor, and the indication module is arranged between the thyristor module and the tripping drive module;

[0008] The detection power supply is connected to the printed circuit board from a first side of the printed circuit board, and the pins of the first varistor are bent toward the first side at a set angle.

[0009] In some embodiments, the first varistor is disposed on the back side of the printed circuit board.

[0010] In some embodiments, the pins of the first varistor are bent 90 degrees toward the first side.

[0011] In some embodiments, the detection power supply includes a current-carrying wire and a shielding wire covering the current-carrying wire, the shielding wire leads to a leakage detection wire, and the current-carrying wire and the leakage detection wire are connected to the printed circuit board from the back side of the printed circuit board.

[0012] In some embodiments, at least one protection resistor is further provided on the device layout area. The at least one protection resistor is provided close to the thyristor driving module and is used to automatically detect connectivity between the shielding wires.

[0013] In some embodiments, the thyristor module includes a thyristor driving module and a thyristor unit, and the thyristor driving module is disposed on a first side of the thyristor unit.

[0014] In some embodiments, 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.

[0015] In some embodiments, the indication module is disposed on a second side edge of the printed circuit board, where the second side is opposite to the first side.

[0016] In some embodiments, a trip reset button is further provided on the device layout area, the trip reset button is provided between the thyristor module and the trip drive module and close to the indication module, and the trip reset button is plugged into the printed circuit board.

[0017] In a second aspect, an embodiment of the present application provides an integrated leakage protection board, which adopts the PCB layout structure as described in the first aspect.

[0018] In a third aspect, an embodiment of the present application provides an air conditioner comprising a plurality of current-carrying wires, at least one leakage detection wire and an integrated leakage protection board as described in the second aspect, wherein the plurality of current-carrying wires and at least one leakage detection wire are connected to the integrated leakage protection board.

[0019] The present application provides a PCB layout structure of a leakage protection integrated board, including a printed circuit board, a device layout area is set on the printed circuit board, and a first varistor, a thyristor module, a trip drive module, a test module and an indication module are set on the device layout area; the first varistor is set at the first side edge of the printed circuit board, the thyristor module and the trip drive module are arranged relative to each other, the test module is arranged between the thyristor module and the trip drive module and close to the first varistor, and the indication module is arranged between the thyristor module and the trip drive module; wherein, the detection power supply is connected to the printed circuit board from the first side of the printed circuit board, and the pins of the first varistor are bent toward the first side at a set angle. The leakage protection integrated board of the embodiment of the present application is integrated with a first varistor for absorbing the leakage current of the detection power supply, the first varistor is set at the edge of the printed circuit board and bent to the outside of the printed circuit board, and does not occupy the device layout space of the printed circuit board; the thyristor module and the trip drive module of the shielding layer connecting different current-carrying lines are arranged relative to each other, which is conducive to the routing design of the printed circuit board. The PCB layout structure design of the leakage protection integrated board of the embodiment of the present application is reasonable, and effectively reduces the volume of the leakage protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the circuit structure of the leakage protection device according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the PCB layout structure of a leakage protection integrated board according to an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the PCB layout structure of a leakage protection integrated board according to another embodiment of the present application. DETAILED DESCRIPTION

[0023] The present application will be described in further detail below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of this application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] In the description of this application, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0026] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] The present invention provides a PCB layout structure for an integrated leakage protection board. The integrated leakage protection board functions as a leakage protection device, designed to identify leakage faults in a connected detection power supply and implement appropriate protective measures when leakage occurs. The PCB layout structure provided in the present invention aims to achieve leakage protection while optimizing the device layout and reducing its size.

[0030] The present application provides a circuit structure of a leakage protection device for realizing the aforementioned leakage protection integrated board. Specifically, the circuit structure of the leakage protection device is as follows: Figure 1As shown, the input end of the leakage protection device is connected to multiple current-carrying wires (including a live wire L and a neutral wire N) and corresponding leakage detection wires. The leakage detection wires are led out from shielded wires covering the current-carrying wires, and the shielded wires are interconnected. The leakage protection device includes a thyristor module 100, a tripping drive module 200, a test module 300, an indicator module 400, a first varistor ZR1, a second varistor ZR2, and a tripping mechanism; the power output from the current-carrying wire (i.e., the detection power supply) supplies power to the load through the leakage protection device.

[0031] Here, the thyristor module 100 includes a thyristor drive module 101 and a thyristor unit SCR. The thyristor drive module 101 includes a second resistor R2, a fourth resistor R4, a Zener diode ZD1, a first capacitor C1, and a second capacitor C2. The thyristor drive module 101 is connected to the drive end of the thyristor unit SCR, and the thyristor module 100 is connected to the leakage detection line corresponding to the neutral line N; the tripping drive module 200 includes a sixth resistor R6, a first diode D1, and a second diode D2. The tripping drive module 200 is connected to the leakage detection line corresponding to the live line L; the tripping mechanism includes a coil KM, and the contacts of the coil KM are set on the live line L and the neutral line N. When the coil KM is energized, the tripping action of the tripping mechanism is triggered, the contacts of the coil KM are disconnected, and the power output by the current-carrying line no longer supplies power to the load.

[0032] It should be noted that the tripping action is a protection measure performed by the leakage protection device when leakage occurs.

[0033] Here, a first end of the coil KM is connected to the neutral line N, a second end of the coil KM is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the live line L via the first diode D1. If leakage occurs in the live line L, during the positive half cycle of the power output by the current-carrying line, the leakage current flows into the trip drive module 200 via the leakage detection line. The live line L, the shielding line, the leakage detection line, the sixth resistor R6, the second diode D2, the coil KM, and the neutral line N form a power-on circuit, thereby turning on the thyristor SCR. Therefore, the tripping action is triggered after the coil KM is energized. The leakage protection device triggers the power-off protection measure when leakage is detected in the live line L.

[0034] Here, the thyristor unit SCR is arranged between the second end of the coil KM and the anode of the first diode D1. If leakage occurs in the neutral line N, during the negative half cycle of the power supply output by the current-carrying line, the leakage current flows into the thyristor module 100 through the leakage detection line. After the leakage current flows into the thyristor drive module 101, the thyristor unit SCR is triggered to turn on. The neutral line N, the coil KM, the thyristor unit SCR, the first diode D1 and the live line L form a power-on circuit. The coil KM triggers the tripping action. The leakage protection device triggers the power-off protection measure when it detects leakage in the live line L, and the leakage current flows back to the live line L through the tripping drive module 200 to prevent the leakage current from damaging the load.

[0035] Here, the test module 300 is set between the live wire L and the corresponding leakage detection line, including a test button SB1 and a third resistor R3. When the test button SB1 is pressed, it can simulate the occurrence of a leakage fault to detect the integrity of the shielding line and the detection line of the leakage protection device; the indication module 400 is set between the anode of the first diode D1 and the second end of the coil KM, including a first resistor R1 and a light-emitting diode LED, which is used to issue a fault warning when a leakage occurs.

[0036] Because there's a delay between detecting a power supply leakage and the leakage protection device tripping, the first and second varistors ZR1 and ZR2 are used to clamp the voltage, ensuring that leakage current doesn't damage the load behind the leakage protection device during the tripping period. Specifically, the first varistor ZR1 clamps the voltage between the current-carrying lines, while the second varistor ZR2 clamps the voltage across coil KM.

[0037] It should be noted that the first varistor ZR1 and the second varistor ZR2 need to absorb a large amount of electrical energy at the moment of leakage. Therefore, the volume of the first varistor ZR1 and the second varistor ZR2 is larger than that of other components of the leakage protection device. In related art, considering the impact of the volume of the first varistor ZR1 on the structural design of the leakage protection device, the first varistor ZR1 is usually not directly installed on the printed circuit board, so as to avoid the first varistor ZR1 occupying too much layout area and increasing the difficulty of layout design. However, if the first varistor ZR1 is installed separately or connected to the printed circuit board using a specific fixing structure, the volume of the leakage protection device will increase, which is not conducive to the installation of the leakage protection device.

[0038] The PCB layout structure of the leakage protection integrated board in the embodiment of the present application is as follows Figure 2As shown, the integrated leakage protection board includes a printed circuit board 500, which has a component layout area. The component layout area houses a first varistor ZR1, a thyristor module 100, a tripping driver module 200, a test module 300, and an indicator module 400. The first varistor ZR1 is positioned on a first side edge of the printed circuit board 500. The thyristor module 100 and the tripping driver module 200 are positioned opposite each other. The test module 300 is positioned between the thyristor module 100 and the tripping driver module 200 and adjacent to the first varistor ZR1. The indicator module 400 is positioned between the thyristor module 100 and the tripping driver module 200. The detection power supply is connected to the printed circuit board 500 from the first side, and the pins of the first varistor ZR1 are bent toward the first side at a set angle. Here, device layout areas are set on both the front side (top layer) and the back side (bottom layer) of the printed circuit board 500. The thyristor module 100, the trip drive module 200, the test module 300 and the indication module 400 are set in the device layout area on the front side of the printed circuit board 500, and the first varistor ZR1 is set in the device layout area on the back side of the printed circuit board 500.

[0039] Here, the detection power supply includes a current-carrying wire and a shielded wire covering the current-carrying wire. The shielded wire leads to a leakage detection wire. The current-carrying wire and the leakage detection wire are connected to the printed circuit board 500 from the back side. The current-carrying wire includes a live wire L and a neutral wire N. The leakage detection wire is led out from the shielded wire covering the live wire L and the shielded wire covering the neutral wire N, respectively.

[0040] It can be understood that the first varistor ZR1 is used to clamp the voltage between the current-carrying lines when leakage occurs. Since the detection power supply is connected to the printed circuit board 500 from the first side of the printed circuit board 500, the first varistor ZR1 is set at the edge of the first side of the printed circuit board 500 to be close to the access point of the current-carrying line; the pins of the first varistor ZR1 are bent toward the first side at a set angle so that the body of the first varistor ZR1 is set outside the device layout area of ​​the printed circuit board 500, thereby achieving the goal of directly mounting the first varistor ZR1 on the printed circuit board 500 without occupying an excessively large device layout area of ​​the printed circuit board 500.

[0041] In some embodiments, as Figure 3 As shown, the pins of the first varistor ZR1 are bent 90 degrees toward the first side.

[0042] It is understood that since the thyristor module 100 is connected to the leakage detection line corresponding to the neutral line N, and the trip driver module 200 is connected to the leakage detection line corresponding to the live line L, the relative layout position between the thyristor module 100 and the trip driver module 200 can be determined based on the access point positions of the leakage detection lines of the detection power supply on the printed circuit board 500. The thyristor module 100 is positioned near the access point of the leakage detection line corresponding to the neutral line N, and the trip driver module 200 is positioned near the access point of the leakage detection line corresponding to the live line L. The thyristor module 100 and the trip driver module 200 are relatively discretely positioned in the device layout area to reduce the difficulty of routing design for the leakage protection integrated board.

[0043] It is understandable that the test module 300 is disposed between the thyristor module 100 and the tripping drive module 200 and close to the first varistor ZR1 , so that the test module 300 is close to the access point of the live wire L and the corresponding leakage detection wire on the printed circuit board 500 .

[0044] Here, the third resistor R3 of the test module 300 is arranged close to the trip drive module 200 , and a mounting hole for mounting the test button 301 is provided on the printed circuit board 500 , and the test button 301 is fixed on the printed circuit board 500 through the mounting hole.

[0045] Here, since the leakage detection line corresponding to the neutral line N is connected to the thyristor driving module 101, and the leakage detection line corresponding to the neutral line N is specifically connected to the second resistor R2, in the PCB layout structure of the embodiment of the present application, the thyristor driving module 101 is set on the first side of the thyristor unit SCR to be close to the access point of the leakage detection line corresponding to the neutral line N.

[0046] Exemplarily, a trip reset button 600 is further provided on the device layout area. The trip reset button 600 is provided between the thyristor module 100 and the trip drive module 200 and close to the indication module 400 . The trip reset button 600 is plugged into the printed circuit board 500 .

[0047] Here, the indication module 400 is arranged on the second side edge of the printed circuit board 500, wherein the second side is a side opposite to the first side; a mounting hole for mounting the reset trip button 600 is provided on the printed circuit board 500, and the reset trip button 600 is fixed between the test button and the indication module 400 through the mounting hole.

[0048] It should be noted that a tripping mechanism (not shown in the figure) is also provided on the back of the printed circuit board 500, and a reset tripping button 600 is provided opposite the tripping mechanism, separated from the printed circuit board 500; upon pressing the reset tripping button 600, the tripping mechanism that has completed the tripping action is reset, and the power output of the current-carrying line is restored to the connection with the load.

[0049] Exemplarily, a second varistor ZR2 is further provided on the device layout area of ​​the printed circuit board 500 . The second varistor ZR2 is connected to the tripping drive module 200 , and the second varistor ZR2 is provided on the back side of the printed circuit board 500 .

[0050] It can be understood that since the second varistor ZR2 is arranged at both ends of the second diode D2, the second varistor ZR2 is arranged opposite the printed circuit board 500 and the tripping drive module 200; since arcing may occur in the first varistor ZR1 and the second varistor ZR2 during the process of absorbing electrical energy when leakage occurs, the first varistor ZR1 and the second varistor ZR2 are arranged in the back device layout area of ​​the printed circuit board 500 to isolate them from the devices arranged in the front device layout area of ​​the printed circuit board 500.

[0051] It can be understood that the PCB layout structure of the leakage protection integrated board in the embodiment of the present application places the components of the leakage protection device on the same printed circuit board. The PCB layout structure is reasonably designed and effectively reduces the volume of the leakage protection device.

[0052] It should be noted that the PCB layout structure of the leakage protection integrated board in the embodiment of the present application is intended to provide an arrangement method for the modules and components of a leakage protection device, and the specific structure and composition of each module are not limited to the following. Figure 1 The circuit structure shown in Figure 1 The connection method of the components in the circuit structure shown is adjusted or the components are equivalently replaced to achieve the functions and effects of the leakage protection device in the embodiment of the present application, which is also applicable to the PCB layout structure of the leakage protection integrated board in the embodiment of the present application.

[0053] Exemplarily, 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 101 for automatically detecting the connectivity between the shielding wires.

[0054] Specifically, a fifth resistor R5 is also provided on the device layout area of ​​the printed circuit board 500. The first end of the fifth resistor R5 is connected to the live wire L, and the second end of the fifth resistor R5 is connected to the second resistor R2. The fifth resistor R5 is provided close to the thyristor drive module 101. When the shielding wires are disconnected, the fifth resistor R5 serves as a power-on circuit between the live wire L and the thyristor module 100 to trigger the tripping mechanism.

[0055] An embodiment of the present application further provides an integrated leakage protection board, which adopts the aforementioned PCB layout structure.

[0056] An embodiment of the present application also provides an electronic device, which includes multiple current-carrying wires, at least one leakage detection wire and the aforementioned leakage protection integrated board, and the multiple current-carrying wires and at least one leakage detection wire are connected to the leakage protection integrated board.

[0057] In some embodiments, the electronic device is an air conditioner.

[0058] Here, the multiple current-carrying wires may include a live wire L and a neutral wire N, and the at least one leakage detection wire may include a first leakage detection wire led out of a shielded wire covering the live wire L and a second leakage detection wire led out of a shielded wire covering the neutral wire N.

[0059] In some embodiments, the leakage protection integrated board can be provided on the plug side of the air conditioner, and the input power of the air conditioner supplies power to the load of the air conditioner via the leakage protection integrated board.

[0060] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0061] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0062] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A PCB layout structure of a leakage protection integrated board, characterized in that: It includes a printed circuit board, the printed circuit board is provided with a device layout area, and the device layout area is provided with a first varistor, a thyristor module, a tripping drive module, a test module and an indication module; The first varistor is arranged at a first side edge of the printed circuit board, the thyristor module and the tripping drive module are arranged opposite to each other, the test module is arranged between the thyristor module and the tripping drive module and close to the first varistor, and the indication module is arranged between the thyristor module and the tripping drive module; The detection power supply is connected to the printed circuit board from a first side of the printed circuit board, and the pins of the first varistor are bent toward the first side at a set angle.

2. The PCB layout structure according to claim 1, wherein: The first varistor is arranged on the back side of the printed circuit board.

3. The PCB layout structure according to claim 1, wherein: The pins of the first varistor are bent 90 degrees toward the first side.

4. The PCB layout structure according to claim 1, wherein: The detection power supply includes a current-carrying line and a shielding line covering the current-carrying line, the shielding line leads to a leakage detection line, and the current-carrying line and the leakage detection line are connected to the printed circuit board from the back side of the printed circuit board.

5. The PCB layout structure according to claim 4, characterized in that: The thyristor module includes a thyristor driving module and a thyristor unit. The thyristor driving module is arranged on a first side of the thyristor unit.

6. The PCB layout structure according to claim 5, characterized in that: At least one protective resistor is further provided on the device layout area. The at least one protective resistor is provided close to the thyristor driving module and is used for automatically detecting connectivity between the shielding wires.

7. The PCB layout structure according to claim 4, wherein: 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.

8. The PCB layout structure according to claim 4, wherein: The indication module is arranged on a second side edge of the printed circuit board, and the second side is a side opposite to the first side.

9. The PCB layout structure according to claim 8, wherein: A trip reset button is also provided on the device layout area. The trip reset button is provided between the thyristor module and the trip drive module and close to the indication module. The trip reset button is plugged into the printed circuit board.

10. A leakage protection integrated board, characterized in that: The leakage protection integrated board adopts the PCB layout structure according to any one of claims 1 to 9.

11. An air conditioner, characterized in that: It comprises a plurality of current-carrying wires, at least one leakage detection wire and the leakage protection integrated board as claimed in claim 10, wherein the plurality of current-carrying wires and the at least one leakage detection wire are connected to the leakage protection integrated board.

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