Electronic control components and electrical equipment

Abstract

The present invention discloses an electronic control assembly and electrical equipment. The electronic control assembly includes: an electronic control board, which is provided with a first filter circuit and a power supply circuit for supplying power to an electrical load. The power supply circuit includes a power input terminal, a rectifier circuit, an IPM module, and a power output terminal, wherein the power input terminal, the rectifier circuit, the IPM module, and the power output terminal are connected in sequence, and a first end of the first filter circuit is connected to the power supply circuit; a metal plate, which is arranged in parallel with one side of the electronic control board and spaced apart from the metal plate; the metal plate is electrically connected to the housing of the electrical load; and a second end of the first filter circuit is electrically connected to the metal plate. The present invention reduces EMC costs, improves production efficiency, and facilitates reducing the installation volume of EMC in electrical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to an electric control component and electrical equipment. Background Art

[0002] EMC refers to the ability of a device or system to operate within its electromagnetic environment as required and not cause intolerable electromagnetic interference to any other equipment in that environment. Therefore, EMC includes two requirements: First, the electromagnetic interference generated by the device during normal operation must not exceed certain limits; second, it requires that the device have a certain degree of immunity to electromagnetic interference in the environment, known as electromagnetic susceptibility.

[0003] Existing technologies typically improve EMC by adding EMC filters and optimizing their parameters. For example, these methods employ magnetic rings, X-capacitors, or common-mode inductors, depending on frequency bands, and add magnetic ring suppression to outputs to reduce electromagnetic interference. However, these methods suffer from high EMC costs, the large number of magnetic rings, complex installation, and low production efficiency. Furthermore, the large size of EMC suppression components, limited by their physical dimensions and the motor's internal structure, makes this improvement approach unsuitable for miniaturized electronic control solutions. Summary of the Invention

[0004] The main purpose of the present invention is to provide an electronic control component and electrical equipment, aiming to reduce EMC costs, improve production efficiency, and reduce the installation volume of EMC in electrical equipment.

[0005] To achieve the above objectives, the present invention proposes an electronic control component comprising:

[0006] An electric control board is provided with a first filter circuit, the power supply circuit includes a power input terminal, a rectifier circuit, an IPM module and a power output terminal, the power input terminal, the rectifier circuit, the IPM module and the power output terminal are connected in sequence, and the first end of the first filter circuit is connected to the power supply circuit;

[0007] A metal plate is arranged in parallel on one side of the electric control board, and the two are arranged at a distance; the metal plate is electrically connected to the housing of the electrical load; and the second end of the first filter circuit is electrically connected to the metal plate.

[0008] Optionally, at least one first filter circuit is connected between the power input terminal and the rectifier circuit, between the rectifier circuit and the IPM module, or between the IPM module and the power output terminal.

[0009] Optionally, the number of the first filter circuits is two, and the power supply line between the power input terminal and the rectifier circuit and the power supply line between the rectifier circuit and the IPM module are respectively connected to the first ends of the two first filter circuits in a one-to-one correspondence;

[0010] Alternatively, the power supply line between the power input terminal and the rectifier circuit, and the power supply line between the IPM module and the power output terminal are respectively connected to the first terminals of the two first filter circuits in a one-to-one correspondence;

[0011] Alternatively, the power supply line between the rectifier circuit and the IPM module and the power supply line between the IPM module and the power output end are respectively connected to the first ends of the two first filter circuits in a one-to-one correspondence.

[0012] Optionally, the number of the first filtering circuits is three, and the first ends of the three first filtering circuits are connected one-to-one between the power input end and the rectifier circuit, between the rectifier circuit and the IPM module, and between the IPM module and the power output end.

[0013] Optionally, the power input terminal includes a neutral wire and a live wire, and when the first end of the first filtering circuit is connected between the power input terminal and the rectifier circuit, the first filtering circuit includes a neutral wire filtering unit and a live wire filtering unit, one end of the neutral wire filtering unit and one end of the live wire filtering unit are respectively connected to the neutral wire and the live wire in a one-to-one correspondence, and the other end of the neutral wire filtering unit and the other end of the live wire filtering unit are both connected to the metal plate;

[0014] When the first end of the first filter circuit is connected between the rectifier circuit and the IPM module, the first filter circuit includes a positive filter unit and a negative filter unit, one end of the positive filter unit and one end of the negative filter unit are respectively connected to the positive output terminal and the negative output terminal of the rectifier circuit, and the other end of the positive filter unit and the other end of the negative filter unit are both connected to the metal plate;

[0015] When the first end of the first filtering circuit is connected between the IPM module and the power output end, the first filtering circuit includes a three-phase filtering unit, one end of the three-phase filtering unit is respectively connected to the three-phase power supply end of the power output end, and the other end of the three-phase filtering unit is connected to the metal plate.

[0016] Optionally, the metal plate is also connected to a ground wire of an AC power source.

[0017] Optionally, the electric control assembly further includes an insulating member, and the insulating member is sandwiched between the electric control board and the metal plate.

[0018] Optionally, the first filtering circuit includes a first capacitor, a first end of the first capacitor is the first end of the first filtering circuit, and a second end of the first capacitor is connected to the metal plate.

[0019] Optionally, the first filtering circuit further includes a first resistor or a first inductor, and the first inductor or the first resistor is arranged in series between the second end of the first capacitor and the metal plate.

[0020] Optionally, the first filtering circuit further includes a first resistor and a first inductor, and the first inductor and the first resistor are respectively connected in series between the second end of the first capacitor and the metal plate.

[0021] Optionally, a second filter circuit is further connected in series between the metal plate and the housing of the electrical load.

[0022] Optionally, the second filtering circuit includes a first capacitor, a first end of the first capacitor is the first end of the second filtering circuit, and a second end of the first capacitor is connected to the metal plate.

[0023] Optionally, the second filtering circuit further includes a first resistor or a first inductor, and the first inductor or the first resistor is arranged in series between the second end of the first capacitor and the metal plate.

[0024] Optionally, the second filtering circuit further includes a first resistor and a first inductor, and the first inductor and the first resistor are respectively connected in series between the second end of the first capacitor and the metal plate.

[0025] The present invention also proposes an electrical device, comprising an electronic control component as described above; the electronic control component comprises: an electronic control board, on which a power input terminal, a rectifier circuit, an IPM module, a power output terminal and a first filter circuit are provided, and the power input terminal, the rectifier circuit, the IPM module and the power output terminal are connected in sequence to form a power supply line for supplying power to the electrical load; the first end of the first filter circuit is connected to the power supply line; a metal plate, the metal plate is arranged in parallel on one side of the electronic control board, and the two are arranged at a distance; the metal plate is electrically connected to the casing of the electrical load; the second end of the first filter circuit is electrically connected to the metal plate.

[0026] The electronic control assembly of the present invention comprises a metal plate added to one side of an electronic control board and a first filter circuit disposed on the board. The first end of the first filter circuit is electrically connected to a power supply line for an electrical load via a wiring pattern on the board. The second end of the first filter circuit is electrically connected to the metal plate, which is also electrically connected to the housing of the electrical load, thereby forming a low-impedance circuit between the first filter circuit, the metal plate, and the housing of the electrical load. When an EMC interference signal is generated, the EMC interference signal primarily flows through the first filter circuit and the metal plate to the motor housing. The motor housing is connected to the motor windings. Distributed capacitance exists between the metal plate and the electronic control board. The EMC interference signal then returns to the source of the EMC interference signal through the distributed capacitance, the motor housing, and the motor windings, thereby preventing the EMC interference signal from escaping the motor. Simultaneously, the EMC interference signal is gradually dissipated as heat in the circuit formed by the first filter circuit, the housing of the electrical load, the distributed capacitance, the rectifier circuit, and the IPM module, thereby preventing the motor from exceeding EMC interference standards. The present invention can effectively block the transmission of EMC interference signals from the power line, thereby achieving effective EMC suppression from the source, with better EMC suppression effect, thereby improving the overall performance of electrical equipment (including electrical appliances such as motors). In addition, it can also help reduce the difficulty of EMC rectification of electrical appliances and shorten the development cycle of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of an embodiment of an electronic control component of the present invention;

[0029] Figure 2 It is a structural schematic diagram of another embodiment of the electric control component of the present invention;

[0030] Figure 3 This is a structural diagram of another embodiment of the electronic control component of the present invention;

[0031] Figure 4 This is a structural diagram of another embodiment of the electronic control component of the present invention;

[0032] Figure 5 Schematic diagram of the circuit structure of an embodiment of the first filter circuit in the electronic control assembly of the present invention;

[0033] Figure 6Schematic diagram of the circuit structure of an embodiment of the second filter circuit in the electronic control component of the present invention.

[0034] Description of Figure Numbers:

[0035] Label name Label name 100 Electric control panel 30 First filter circuit 200 Metal Sheet 40 Second filter circuit 300 Electrical load C1 First capacitor 10 Rectifier circuit R1 First resistor 20 IPM module L1 First Inductor

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The present invention provides an electric control component suitable for electrical appliances, such as air conditioners, washing machines and other household appliances, and is particularly suitable for one-to-many air conditioners.

[0041] Reference Figures 1 to 6 In one embodiment of the present invention, the electronic control component includes:

[0042] The electronic control board 100 is provided with a first filter circuit 30 and a power supply circuit (not shown) for supplying power to an electrical load. The power supply circuit includes power input terminals (AC(L) and AC(N)), a rectifier circuit 10, an IPM module 20, and a power output terminal (UVW). The power input terminal, rectifier circuit 10, IPM module 20, and power output terminal (UVW) are sequentially connected to the load 300. A first end of the first filter circuit 30 is connected to the power supply circuit 110.

[0043] The metal plate 200 is arranged in parallel on one side of the electric control board 100 with a distance therebetween; the metal plate 200 is electrically connected to the housing of the electric load 300; and the second end of the first filter circuit 30 is electrically connected to the metal plate 200.

[0044] In this embodiment, the electrical control board 100 can be implemented using a single-sided board or a double-sided board, and can be specifically configured based on the installation space and location of the electrical equipment in the actual application. The electrical control board 100 can also be provided with a PFC circuit composed of components such as a PFC power switch, a diode, and a PFC inductor to achieve power factor correction for the DC power output by the rectifier circuit 10. The PFC circuit can be implemented using a passive PFC circuit to form a boost PFC circuit, a buck PFC circuit, or a buck-boost PFC circuit. It will be understood that in actual applications, the position and connection relationship between the PFC power switch 31 and the rectifier circuit 10 can be adaptively adjusted based on the type of PFC circuit configuration.

[0045] The IPM module 20 integrates multiple power switches, which together form a drive inverter circuit. For example, six power switches can form a three-phase inverter bridge circuit, or four power switches can form a two-phase inverter bridge circuit. Each power switch can be implemented using a MOS transistor or an IGBT. The IPM module 20 is used to drive a compressor motor. In other embodiments, the IPM module 20 can also be used to drive inverters for other motors and various inverter power supplies, and has applications in variable-frequency speed regulation, metallurgical machinery, electric traction, servo drives, and variable-frequency home appliances such as air conditioners.

[0046] The metal plate 200 can be made of copper, its alloys, or aluminum, its alloys. The spacing between the metal plate 200 and the electronic control board 100 can be set according to safety distance regulations. Setting the spacing between the metal plate 200 and the electronic control board 100 within the safety distance regulations can ensure that the metal plate 200 can effectively suppress EMC interference signals. It is understood that the metal plate 200 and the electronic control board 100 can form a distributed capacitance. While the spacing between the metal plate 200 and the electronic control board 100 is set according to safety distance regulations, it can also be set to ensure that the resonant frequency of the distributed capacitance is close to or equal to the EMC interference frequency of the motor. In other words, the distance between the metal plate 200 and the electronic control board 100 can ensure that the resonant frequency of the distributed capacitance is close to or equal to the EMC interference frequency of the motor.

[0047] The electrical load 300 can be a compressor motor, a fan motor, or other electrical loads 300 in an electrical device. For ease of description, the following uses a motor as an example. The housing of the electrical load 300, that is, the motor housing, is generally set as a metal housing and connected to the ground wire of the electrical device, so that the housing of the electrical device is also a grounding protection wire, so as to connect all electrical devices and metal pipes to an equipotential state, forming a loop metal mesh, thereby achieving leakage protection and preventing static electricity from damaging the electrical equipment.

[0048] When the electrical device is powered on and begins operating, the rectifier circuit 10 converts the incoming AC power into a DC voltage and outputs it to the IPM module 20. The IPM module 20 then inverts the DC voltage using the power transistor switching devices within the IPM module 20 according to a specific algorithm, thereby supplying power to the load 300. During operation, both the rectifier circuit 10 and the IPM module 20 generate EMC interference signals. The AC power also introduces some EMC interference signals. For example, the rapid on / off switching of the power transistors within the IPM module 20 generates high dV / dt and di / dt, which can cause EMC interference signals on the electrical control board 100.

[0049] To address the above issues, the first end of the first filter circuit 30 is connected to the power supply line 110 and electrically connected via the wiring pattern on the electronic control board 100. The second end of the first filter circuit 30 is electrically connected to the metal plate 200. Specifically, the metal plate 200 and the electronic control board 100 can be electrically connected to the first filter circuit 30 disposed on the electronic control board 100 via wires, flexible printed circuit boards, or the like. The metal plate 200 is electrically connected to the housing of the electrical load 300 via wires, flexible printed circuit boards, or the like, and is fixedly connected via screws, rivets, or welding, forming a low-impedance conductor loop between the metal plate 200, the filter circuit, and the housing of the electrical device.

[0050] For example, when an EMC interference signal flows from the positive electrode of the DC power supply in the rectifier circuit 10 to the negative electrode of the DC power supply, it will flow through the first filter circuit 30 and the metal plate 200 to the housing of the electrical equipment. Because distributed capacitance is formed between the metal plate 200 and the electronic control board 100, and the motor housing is connected to the ground wire of the motor winding, the EMC interference signal flowing to the motor housing will pass through the distributed capacitance, the ground wire of the motor winding, and the IPM module 20 back to the rectifier circuit 10, thus preventing the EMC interference signal from flowing out of the rectifier circuit 10.

[0051] When an EMC interference signal flows from the power supply circuit of the three-phase inverter bridge circuit of IPM module 20 to the motor, it flows through first filter circuit 30 and metal plate 200 to the housing of the electrical equipment. Because distributed capacitance is formed between metal plate 200 and the circuit wiring layer of electronic control board 100, and the motor housing is connected to the ground wire of the motor winding, the EMC interference signal flowing to the motor housing will return to IPM module 20 through the distributed capacitance and the ground wire of the motor winding. This prevents the EMC interference signal from flowing out of IPM module 20. At the same time, the EMC interference signal is gradually dissipated as heat in the loop formed by first filter circuit 30, metal plate 200, motor housing, parasitic capacitance, and controller, thereby preventing the motor's EMC interference from exceeding standards.

[0052] When an EMC interference signal enters from the power line, the EMC interference signal passes through the low-impedance loop formed by the first filtering circuit 30 and the metal plate 200, which can also block the flow of the EMC interference signal from being transmitted from the power line. That is, EMC is effectively suppressed from the source, and the EMC suppression effect is better, thereby improving the overall performance of electrical equipment (including electrical appliances with motors). In addition, it can also help improve the matching degree between the motor and the mainboard (of the electrical appliance corresponding to the motor), thereby reducing the difficulty of EMC rectification of the entire electrical appliance and shortening the development cycle of the entire appliance.

[0053] The electronic control assembly of the present invention adds a metal plate 200 to one side of the electronic control board 100. The first end of the first filter circuit 30, located on the electronic control board 100, is connected to the power supply line 110, and is electrically connected to the power supply line via the wiring pattern on the electronic control board 100. The second end of the first filter circuit 30 is electrically connected to the metal plate 200, which is also electrically connected to the housing of the electrical load 300. This creates a low-impedance loop between the first filter circuit 30, the metal plate 200, and the housing of the electrical load 300. When an EMC interference signal is generated, it primarily flows through the first filter circuit 30 and the metal plate 200 to the motor housing. The motor housing is connected to the motor windings, and distributed capacitance exists between the metal plate 200 and the electronic control board 100. The EMC interference signal then returns to its source through the distributed capacitance, the motor housing, and the motor windings, thereby preventing the EMC interference signal from flowing out of the motor. At the same time, the EMC interference signal is gradually consumed in the form of heat in the loop formed by the first filter circuit 30, the housing of the power load 300, the distributed capacitors, the rectifier circuit 10, and the IPM module 20, thereby preventing the motor's EMC interference from exceeding the standard. The present invention can effectively block the transmission of EMC interference signals from the power line, effectively suppressing EMC at the source, achieving a better EMC suppression effect, thereby improving the overall performance of the electrical equipment product. In addition, it can also help reduce the difficulty of EMC rectification of the entire electrical equipment and shorten the overall equipment development cycle.

[0054] In addition, the electric control assembly of the present invention only requires adding a metal plate 200 to one side of the electric control board 100, and electrically connecting it to the outer shell of the electric load 300 through the filter circuit, thereby forming a low-impedance circuit. This can reduce the use of magnetic rings, reduce EMC costs, and improve production efficiency. In addition, the metal plate 200 occupies very little space inside the electrical equipment. Therefore, it can also be used in electrical equipment with a small built-in space, which can further reduce the installation space of the electrical equipment and thus reduce the size of the electrical equipment.

[0055] Reference Figures 1 to 6 In an optional embodiment, one or more first filter circuits 30 may be provided, for example, two or three. Specifically, at least one first filter circuit 30 is connected between the power input terminals (AC(L) and AC(N)) and the rectifier circuit 10, between the rectifier circuit 10 and the IPM module 20, and between the IPM module 20 and the power output terminal. In practical applications, the number and location of the first filter circuits 30 can be set at the source of the EMC interference signal.

[0056] When the number of the first filter circuit 30 is set to one, the first end of the first filter circuit 30 is connected between the power input end (AC(L) and AC(N)) and the rectifier circuit 10; or, the first end of the first filter circuit 30 is connected between the rectifier circuit 10 and the IPM module 20; or, the first end of the first filter circuit 30 is connected between the IPM module 20 and the power load 300.

[0057] When two are provided, the power supply lines between the power input terminals (AC(L) and AC(N)) and the rectifier circuit 10, and the power supply lines between the rectifier circuit 10 and the IPM module 20 are respectively connected to the first terminals of the two first filter circuits 30 in a one-to-one correspondence;

[0058] Alternatively, the power supply line between the power input terminal (AC(L) and AC(N)) and the rectifier circuit 10, and the power supply line between the IPM module 20 and the power output terminal (UVW) are respectively connected to the first terminals of the two first filter circuits 30 in a one-to-one correspondence;

[0059] Alternatively, the power supply line between the rectifier circuit 10 and the IPM module 20 and the power supply line between the IPM module 20 and the power output terminal (UVW) are respectively connected to the first terminals of the two first filter circuits 30 in a one-to-one correspondence.

[0060] When the number of the first filtering circuits 30 is set to three, the power input terminals (AC(L) and AC(N)), the power supply line between the rectifier circuit 10 and the IPM module 20, and the power supply line between the IPM module 20 and the power output terminal (UVW) are respectively connected to the first terminals of the three first filtering circuits 30 in a one-to-one correspondence.

[0061] It is understood that when there are multiple first filter circuits 30, the EMC interference signals generated by the AC power supply, the rectifier circuit 10, or the IPM module 20 can be coupled to the metal plate 200 through the multiple first filter circuits 30. Multiple low-impedance loops are formed through the first filter circuits 30, the metal plate 200, and the housing of the electrical load 300. These multiple low-impedance loops can then transmit the EMC interference signals generated by the rectifier circuit 10, the IPM module 20, or the AC power supply back to the source of the EMC interference signals. Furthermore, providing multiple first filter circuits 30 allows the EMC interference signals to flow through the multiple low-impedance loops, thereby increasing the rate at which the EMC interference signals are dissipated as heat in the loop formed by the first filter circuits 30, the housing of the electrical load 300, the distributed capacitors, the rectifier circuit 10, and the IPM module 20, thereby further preventing the motor from exceeding EMC interference standards.

[0062] Reference Figures 1 to 6 In an optional embodiment, the power input terminal AC-in includes a neutral line AC (N) and a live line AC (L). When the first end of the first filter circuit 30 is connected between the power input terminal AC-in and the rectifier circuit 10, the first filter circuit 30 includes a neutral line filter unit 311 and a live line filter unit 312. One end of the neutral line filter unit 311 and one end of the live line filter unit 312 are respectively connected to the neutral line AC (N) and the live line AC (L). The other end of the neutral line filter unit 311 and the other end of the live line filter unit 312 are both connected to the metal plate 200.

[0063] When the first end of the first filter circuit 30 is connected between the rectifier circuit 10 and the IPM module 20, the first filter circuit 30 includes a positive filter unit 321 and a negative filter unit 322. One end of the positive filter unit 321 and one end of the negative filter unit 322 are respectively connected to the positive output terminal D+ and the negative output terminal D- of the rectifier circuit 10 in a one-to-one correspondence, and the other end of the positive filter unit 321 and the other end of the negative filter unit 322 are both connected to the metal plate 200.

[0064] When the first end of the first filter circuit 30 is connected between the IPM module 20 and the electrical load 300, the first filter circuit 30 includes a three-phase filter unit (331~333), one end of the three-phase filter unit (331~333) is respectively connected to the three-phase power supply end (UVW) of the electrical load 300, and the other end of the three-phase filter unit (331~333) is connected to the metal plate 200.

[0065] In this embodiment, multiple filter units are connected to corresponding power lines. By providing multiple filter units, multiple low-impedance loops are formed between the metal plate 200 and the motor housing, thereby preventing EMC interference signals from escaping the motor. Multiple loops are formed between the multiple filter units, the metal plate 200, the motor housing, the distributed capacitance formed between the metal plate 200 and the electronic control board 100, the rectifier circuit 10, and the IPM module 20. As EMC interference signals flow through these multiple loops, they are gradually dissipated as heat, thereby improving the suppression rate of EMC interference signals.

[0066] Reference Figures 1 to 6 In an optional embodiment, the metal plate 200 is also connected to the ground wire E of the AC power supply.

[0067] In this embodiment, the metal plate 200 is also connected to the AC power supply ground line E, thereby forming multiple low-impedance loops between the first filter circuit 30, the AC power supply ground line E, and the housing of the power load 300. When an EMC interference signal is generated, the EMC interference signal will generally flow through the first filter circuit 30 and the metal plate 200 to the motor housing, or through the first filter circuit 30 and the metal plate 200 to the AC power supply ground line E. The EMC interference signal then returns to the source of the EMC interference signal through the distributed capacitors, the motor housing, the motor windings, and the AC power supply ground line E, thereby increasing the transmission speed of the EMC interference signal. This further prevents the EMC interference signal from flowing out of the motor. At the same time, the EMC interference signal is gradually dissipated as heat in the loop formed by the first filter circuit 30, the housing of the power load 300, the distributed capacitors, the rectifier circuit 10, and the IPM module 20, thereby preventing the motor from exceeding EMC interference standards. Furthermore, the metal plate 200 is electrically connected to the ground line E of the AC power supply, and its potential is the ground potential. The metal plate 200 can maintain the ground line, and can also suppress EMC interference signals from being transmitted to the ground line.

[0068] Reference Figures 1 to 6 In an optional embodiment, the electric control assembly further includes an insulating member (not shown), which is sandwiched between the electric control board 100 and the metal plate 200 .

[0069] In this embodiment, the insulating member can be a plastic package for mounting the electronic control board 100, or it can be in the form of a plate. The insulating member is sandwiched between the electronic control board 100 and the metal plate 200 to provide insulation between the electronic control board 100 and the metal plate 200. The insulating member can be fixed to the electronic control board 100 and the metal plate 200 by screws. The insulating member and the metal plate 200 can also be connected by interference fit design (connection), riveting, pressure casting, or can be integrated with the insulating member through some processing method, such as glue fixation.

[0070] Reference Figures 1 to 6 In an optional embodiment, the first filtering circuit 30 includes a first capacitor C1, a first end of the first capacitor C1 is a first end of the first filtering circuit 30, and a second end of the first capacitor C1 is a second end of the first filtering circuit 30;

[0071] Furthermore, the first filtering circuit 30 further includes a first resistor R1 or a first inductor L1 , and the first inductor L1 or the first resistor R1 is connected in series between the second end of the first capacitor C1 and the metal plate 200 .

[0072] Furthermore, the first filtering circuit 30 further includes a first resistor R1 and a first inductor L1 . The first inductor L1 and the first resistor R1 are connected in series between the second end of the first capacitor C1 and the metal plate 200 .

[0073] Reference Figures 1 to 6 In an optional embodiment, a second filter circuit 40 is further connected in series between the metal plate 200 and the housing of the electrical load 300 .

[0074] In this embodiment, the second filter circuit 40 is configured to form a low-impedance loop with the metal plate 200, the motor housing, the metal plate 200, and the first filter circuit 30. When an EMC interference signal is generated, the EMC interference signal primarily passes through the first filter circuit 30 and the metal plate 200. The second filter circuit 40 flows toward the motor housing, which is connected to the motor windings. Furthermore, distributed capacitance exists between the metal plate 200 and the electronic control board 100. The EMC interference signal then returns to its source through the distributed capacitance, the motor housing, and the motor windings, thereby preventing the EMC interference signal from flowing out of the motor.

[0075] Furthermore, the second filtering circuit 40 includes a first capacitor C1 , a first end of the first capacitor C1 is a first end of the second filtering circuit 40 , and a second end of the first capacitor C1 is connected to the metal plate 200 .

[0076] Furthermore, the second filtering circuit 40 further includes a first resistor R1 or a first inductor L1 , and the first inductor L1 or the first resistor R1 is connected in series between the second end of the first capacitor C1 and the metal plate 200 .

[0077] Furthermore, the second filtering circuit 40 further includes a first resistor R1 and a first inductor L1 . The first inductor L1 and the first resistor R1 are respectively connected in series between the second end of the first capacitor C1 and the metal plate 200 .

[0078] In this embodiment, both the first filter circuit 30 and the second filter circuit 40 can be implemented using a first capacitor C1, an RC filter circuit consisting of the first capacitor C1 and a first resistor R1, an LC filter circuit consisting of the first capacitor C1 and a first inductor L1, or an RLC filter circuit. When the RC filter circuit consisting of the first capacitor C1 and the first resistor R1 is used, the first capacitor C1 and the first resistor R1 are sequentially connected in series between the power supply line 110 and the metal plate 200. When the LC filter circuit consisting of the first capacitor C1 and the first inductor L1 is used, the first capacitor C1 and the first inductor L1 are sequentially connected in series between the power supply line 110 and the metal plate 200. When the LC filter circuit consisting of the first capacitor C1 and the first inductor L1 is used, the first inductor L1 and the first resistor R1 are connected in parallel and then connected in series with the first capacitor C1. That is, the first capacitor C1 and the parallel-connected first inductor L1 and the first resistor R1 are sequentially connected in series between the power supply line 110 and the metal plate 200. It is understood that the circuit structures of the first filter circuit 30 and the second filter circuit 40 can be the same or different, and this is not limited here. In addition, one or more filter branches can be provided in the first filter circuit 30 and the second filter circuit 40. For example, the first filter circuit 40 can be provided with one or more combinations of an RC filter branch, an LC filter branch, and an RLC filter branch.

[0079] Among them, the first capacitor C1 can be a Y capacitor with specifications corresponding to the EMC interference frequency, so that the EMC interference signal can pass through the first capacitor C1 more easily. Optionally, the specifications of the first capacitor C1 correspond to the EMC interference frequency of the motor, which means that the resonance point frequency of the first capacitor C1 is close to or equal to the EMC interference frequency of the motor. Among them, the capacity of the first capacitor C1 determines its resonance point frequency, which can be set specifically according to the EMC interference frequency. For example, a capacitor with commonly used specifications such as 1000pF, 2200pF, 4700pF or 10000pF can be set. Through the first resistor R1, the EMC interference signal flowing through the first resistor R1 can be gradually consumed in the form of heat, thereby avoiding the EMC interference of the motor exceeding the standard. A band-stop filter circuit is formed. By connecting the first capacitor C1 and the first inductor L1 in series, the resonant signal impedance can be reduced, thereby making it easy for signals outside the resonant frequency to pass through, while effectively suppressing signals that resonate with the EMC interference frequency.

[0080] It is understood that the present invention utilizes a filter circuit consisting of a first capacitor C1 and a first resistor or a first inductor L1, eliminating the need for magnetic rings, X capacitors, or common-mode inductors. This can help reduce high EMC costs, and the electronic control component does not require a magnetic ring, facilitating installation. Furthermore, it can address the issue of EMC suppression components such as magnetic rings, X capacitors, or common-mode inductors being large in size, which can hinder their application in electrical equipment due to limitations in their physical dimensions and the internal structure of the motor.

[0081] The present invention also includes an electrical device including the aforementioned electronic control assembly. The detailed structure of the electronic control assembly can be found in the aforementioned embodiments and will not be further described here. It will be understood that since the aforementioned electronic control assembly is used in the electrical device of the present invention, the embodiments of the electrical device of the present invention include all technical solutions of all the aforementioned electronic control assembly embodiments, and the technical effects achieved are identical, and will not be further described here.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present description and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An electronic control component, characterized in that: The electronic control component includes: An electric control board is provided with a first filter circuit and a power supply circuit for supplying power to an electrical load, the power supply circuit including a power input terminal, a rectifier circuit, an IPM module, and a power output terminal, the power input terminal, the rectifier circuit, the IPM module, and the power output terminal being connected in sequence, and a first end of the first filter circuit being connected to the power supply circuit; a metal plate, the metal plate being arranged in parallel on one side of the electric control board with a distance therebetween; the metal plate being electrically connected to the housing of the electrical load; and the second end of the first filter circuit being electrically connected to the metal plate; A low-impedance loop is formed among the first filter circuit, the metal plate and the housing of the electrical load, and a distributed capacitor is formed between the metal plate and the electric control board.

2. The electronic control assembly according to claim 1, wherein: At least one first filter circuit is connected between the power input terminal and the rectifier circuit, between the rectifier circuit and the IPM module, or between the IPM module and the power output terminal.

3. The electronic control assembly according to claim 2, wherein: There are two first filter circuits, and the power supply line between the power input terminal and the rectifier circuit and the power supply line between the rectifier circuit and the IPM module are respectively connected to the first ends of the two first filter circuits in a one-to-one correspondence; Alternatively, the power supply line between the power input terminal and the rectifier circuit, and the power supply line between the IPM module and the power output terminal are respectively connected to the first terminals of the two first filter circuits in a one-to-one correspondence; Alternatively, the power supply line between the rectifier circuit and the IPM module and the power supply line between the IPM module and the power output end are respectively connected to the first ends of the two first filter circuits in a one-to-one correspondence.

4. The electronic control assembly according to claim 2, wherein: There are three first filter circuits, and the first ends of the three first filter circuits are connected one-to-one between the power input end and the rectifier circuit, between the rectifier circuit and the IPM module, and between the IPM module and the power output end.

5. The electronic control assembly according to claim 2, wherein: The power input terminal includes a neutral line and a live line. When the first end of the first filter circuit is connected between the power input terminal and the rectifier circuit, the first filter circuit includes a neutral line filter unit and a live line filter unit. One end of the neutral line filter unit and one end of the live line filter unit are respectively connected to the neutral line and the live line in a one-to-one correspondence, and the other end of the neutral line filter unit and the other end of the live line filter unit are both connected to the metal plate. When the first end of the first filter circuit is connected between the rectifier circuit and the IPM module, the first filter circuit includes a positive filter unit and a negative filter unit, one end of the positive filter unit and one end of the negative filter unit are respectively connected to the positive output terminal and the negative output terminal of the rectifier circuit, and the other end of the positive filter unit and the other end of the negative filter unit are both connected to the metal plate; When the first end of the first filtering circuit is connected between the IPM module and the power output end, the first filtering circuit includes a three-phase filtering unit, one end of the three-phase filtering unit is respectively connected to the three-phase power supply end of the power output end, and the other end of the three-phase filtering unit is connected to the metal plate.

6. The electronic control assembly according to claim 1, wherein: The metal plate is also connected to the ground wire of the AC power supply.

7. The electronic control assembly according to claim 1, wherein: The electric control assembly further includes an insulating member, which is sandwiched between the electric control board and the metal plate.

8. The electronic control assembly according to claim 1, wherein: The first filtering circuit includes a first capacitor, a first end of the first capacitor is the first end of the first filtering circuit, and a second end of the first capacitor is connected to the metal plate.

9. The electronic control assembly according to claim 8, wherein: The first filtering circuit further includes a first resistor or a first inductor, and the first inductor or the first resistor is arranged in series between the second end of the first capacitor and the metal plate.

10. The electronic control assembly according to claim 8, wherein: The first filtering circuit further includes a first resistor and a first inductor, wherein the first inductor and the first resistor are respectively connected in series between the second end of the first capacitor and the metal plate.

11. The electronic control assembly according to any one of claims 1 to 10, characterized in that: A second filter circuit is further connected in series between the metal plate and the housing of the electrical load.

12. The electronic control assembly according to claim 11, wherein: The second filtering circuit includes a first capacitor, a first end of the first capacitor is the first end of the second filtering circuit, and a second end of the first capacitor is connected to the metal plate.

13. The electronic control assembly according to claim 12, wherein: The second filtering circuit further includes a first resistor or a first inductor, and the first inductor or the first resistor is arranged in series between the second end of the first capacitor and the metal plate.

14. The electronic control assembly according to claim 12, wherein: The second filtering circuit further includes a first resistor and a first inductor, wherein the first inductor and the first resistor are respectively connected in series between the second end of the first capacitor and the metal plate.

15. An electrical device, characterized in that: Comprising the electronic control component according to any one of claims 1 to 14.

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