Air conditioner

Abstract

The utility model discloses an air conditioner. The air conditioner comprises an electrolytic capacitor; the two input ends of the first power module are connected with the filter circuit, and the first power module drives the compressor to work; the first end of the current detection resistor is connected with the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected with the power supply grounding end of the first power module; a power supply grounding end of the main control circuit is connected with a grounding conductive surface of the main control circuit; the grounding conductive surface of the main control circuit is connected with the first end of the current detection resistor through a first conductive wire; the current detection and protection circuit is used for protecting the compressor, and the power supply grounding end of the current detection and protection circuit is connected with the grounding conductive surface of the main control circuit; therefore, the signal acquisition of the main control circuit is less affected by the first power module, the signal acquired by the main control circuit is accurate, and misjudgment is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of air conditioners, and particularly relates to an air conditioner. Background Art

[0002] An air conditioner includes an indoor part and an outdoor part. The outdoor part may include an outdoor air inlet and an outdoor air outlet. The outdoor part may include an outdoor heat exchanger and an outdoor fan. Driven by the outdoor fan, air enters the outdoor heat exchanger through the outdoor air inlet to exchange heat with the outdoor heat exchanger, and the air after exchanging heat with the outdoor heat exchanger flows out through the outdoor air outlet.

[0003] An air conditioner includes a compressor and an electronic control board. A power module may be arranged on the electronic control board, and the power module drives the compressor and the outdoor fan to work.

[0004] There are more and more circuits on the electronic control board. The main control circuit, power module, power factor correction circuit and filtering module are integrated on one electronic control board. The power factor correction circuit generally includes a high-frequency inductor, resulting in a relatively high frequency and large interference on the electronic control board. Especially in the case of dual power modules and multiple power modules, the operating frequencies on the circuit board are diverse, making the electromagnetic field on the circuit board relatively complex. The main control circuit is extremely vulnerable to interference. The signal acquisition of the main control circuit is collected relative to the ground point. The grounding end of the main control circuit is far from the grounding end of strong interference modules such as the power module and there are other circuits connected in the middle, making the main control circuit unable to accurately collect signals such as current, voltage and temperature, and prone to frequent failures or burning out of the power module. Therefore, this application proposes an air conditioner. Summary of the Invention

[0005] The present utility model aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, according to an embodiment of the present disclosure, an air conditioner is proposed, including:

[0007] An air conditioner indoor unit and an air conditioner outdoor unit, wherein the air conditioner outdoor unit includes:

[0008] An outdoor machine case, on which an outdoor air inlet and an outdoor air outlet are formed;

[0009] An outdoor heat exchanger, arranged inside the outdoor machine case;

[0010] An outdoor fan, arranged inside the outdoor machine case and located on one side of the outdoor heat exchanger close to the outdoor air outlet;

[0011] A compressor, arranged inside the outdoor machine case;

[0012] An electronic control board, arranged inside the outdoor machine case and including:

[0013] A rectifier circuit for rectifying alternating current into direct current;

[0014] A power factor correction circuit, whose input end is connected to the output end of the rectifier circuit;

[0015] A filter circuit, connected to the output end of the power factor correction circuit and including:

[0016] An electrolytic capacitor having a negative electrode;

[0017] A first power module, whose two input ends are connected to the filter circuit, and the first power module is connected to the compressor to drive the compressor to work;

[0018] A current detection resistor, the first end of the current detection resistor is connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to the ground terminal of the power supply of the first power module;

[0019] A main control circuit, the ground terminal of the power supply of the main control circuit is connected to the grounding conductive surface of the main control circuit; the grounding conductive surface of the main control circuit is connected to the first end of the current detection resistor through a first wire;

[0020] A current detection and protection circuit for protecting the compressor, the ground terminal of the power supply of the current detection and protection circuit is connected to the grounding conductive surface of the main control circuit.

[0021] Set the first end of the current detection resistor to be connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to the ground terminal of the power supply of the first power module, the ground terminal of the power supply of the main control circuit is connected to the grounding conductive surface of the main control circuit; the grounding conductive surface of the main control circuit is connected to the first end of the current detection resistor through a first wire, so that the ground terminal of the power supply of the main control circuit is connected to the ground terminal of the current detection resistor, so that the ground point for the main control circuit to collect signals is the same as the ground point for the first power module to reference, so that the collection of signals by the main control circuit is less affected by the first power module, so that the signals collected by the main control circuit are accurate, reducing misjudgment, avoiding frequent generation of faults, and avoiding burning out the first power module; set the ground terminal of the power supply of the current detection and protection circuit to be connected to the grounding conductive surface of the main control circuit, so that the reference ground point for the signals obtained by the current detection and protection circuit is the same as the reference ground point for the signals obtained by the main control circuit, so that the error and fluctuation of the signals of the current detection and protection circuit and the signals of the main control circuit are small, reducing misjudgment.

[0022] According to an embodiment of the present disclosure, the electronic control board includes a substrate; the first power module, the current detection resistor, the main control circuit and the current detection and protection circuit are arranged on the substrate; the substrate has a length direction;

[0023] Along the length direction of the substrate, the current detection resistor is disposed between the first power module and the main control circuit;

[0024] Along the length direction of the substrate, the distance between the current detection and protection circuit and the current detection resistor is less than the distance between the main control circuit and the current detection resistor;

[0025] The length of the first wire is a first length L, where L ≤ 20 mm.

[0026] Setting the current detection resistor between the first power module and the main control circuit enables the distances among the first power module, the current detection resistor, and the main control circuit to be set relatively close, with L ≤ 20 mm. This can avoid the first wire being too long, avoid the first wire passing through a large number of circuits, avoid the circuits passed through affecting the voltage of the first wire and causing a large voltage difference, and avoid the large voltage difference making the signal obtained by the main control circuit inaccurate, thus keeping the interference within a certain range;

[0027] Setting the distance between the current detection and protection circuit and the current detection resistor to be less than the distance between the main control circuit and the current detection resistor makes the input signal of the current detection and protection circuit relatively stable.

[0028] According to an embodiment of the present disclosure, the width of the first wire is a first width W, where 1 mm ≤ W ≤ 2 mm. This can avoid the first width being too wide and causing non-single-point grounding between the first wire and other wires when connecting to the current detection resistor and the grounding conductive surface, and avoid the first width being too narrow and causing unstable connection between the current detection resistor and the grounding conductive surface, ensuring reliable connection between the two.

[0029] According to an embodiment of the present disclosure, the electronic control board includes:

[0030] A switching power supply circuit for supplying power to the first power module, the main control circuit, and the current detection and protection circuit. The switching power supply circuit includes:

[0031] A power supply chip;

[0032] A transformer including a primary winding and a secondary winding. The first end of the primary winding is connected to the power ground terminal of the power supply chip and then connected to the negative electrode of the electrolytic capacitor. The first end of the secondary winding is connected to the first end of the primary winding, enabling the grounding ends of the primary winding and the secondary winding to be directly connected, and enabling the grounding end of the secondary winding to be connected to the electrolytic capacitor. This can avoid the secondary winding connecting to other circuits and then winding around to the negative electrode of the electrolytic capacitor, reduce the path between the grounding end of the secondary winding and the negative electrode of the electrolytic capacitor, and avoid interference from large loops, making the voltage output by the switching power supply circuit more stable.

[0033] According to an embodiment of the present disclosure, the switching power supply circuit includes:

[0034] A sixth diode, whose anode is connected to the second end of the secondary winding;

[0035] A first capacitor, whose positive electrode is connected to the cathode of the sixth diode and whose negative electrode is connected to the first end of the secondary winding.

[0036] Make the negative electrode of the first capacitor directly connected to the first end of the secondary winding, make the negative electrode of the first capacitor connected to the electrolytic capacitor, avoid the negative electrode of the first capacitor winding around to the negative electrode of the electrolytic capacitor after being connected to other circuits, can reduce the path between the negative electrode of the first capacitor and the negative electrode of the electrolytic capacitor, without the interference of large loops, and make the voltage output by the switching power supply circuit more stable.

[0037] According to an embodiment of the present disclosure, a first voltage output terminal between the positive electrode of the first capacitor and the cathode of the sixth diode is connected to the positive power supply terminal of the main control circuit and the positive power supply terminal of the current detection and protection circuit through a voltage regulator, so that the switching power supply circuit supplies power to the main control circuit and the current detection and protection circuit.

[0038] According to an embodiment of the present disclosure, the switching power supply circuit includes:

[0039] A seventh diode, whose anode is connected to the third end of the secondary winding, and the second end of the secondary winding is located between the third end and the first end of the secondary winding;

[0040] A second capacitor, whose negative electrode is connected to the first end of the secondary winding and whose positive electrode is connected to the cathode of the seventh diode.

[0041] Make the negative electrode of the second capacitor directly connected to the first end of the secondary winding, make the negative electrode of the second capacitor connected to the electrolytic capacitor, avoid the negative electrode of the second capacitor winding around to the negative electrode of the electrolytic capacitor after being connected to other circuits, can reduce the path between the negative electrode of the second capacitor and the negative electrode of the electrolytic capacitor, without the interference of large loops, and make the voltage output by the switching power supply circuit more stable.

[0042] According to an embodiment of the present disclosure, a second voltage output terminal between the positive electrode of the second capacitor and the cathode of the seventh diode is connected to the positive power supply terminal of the power supply of the first power module, so that the switching power supply circuit supplies power to the first power module.

[0043] According to an embodiment of the present disclosure, the electronic control board includes:

[0044] A second power module, whose two input terminals are respectively connected to the positive electrode and the negative electrode of the electrolytic capacitor. The second power module is connected to the outdoor fan to drive the outdoor fan to work; the power supply ground terminal of the second power module is connected to the negative electrode of the electrolytic capacitor.

[0045] According to an embodiment of the present disclosure, an air conditioner is further provided, including:

[0046] an indoor unit of the air conditioner and an outdoor unit of the air conditioner, where the outdoor unit of the air conditioner includes:

[0047] an outdoor housing, on which an outdoor air inlet and an outdoor air outlet are formed;

[0048] an outdoor heat exchanger disposed inside the outdoor housing;

[0049] an outdoor fan disposed inside the outdoor housing and located on a side of the outdoor heat exchanger close to the outdoor air outlet;

[0050] a compressor disposed inside the outdoor housing;

[0051] an electronic control board disposed inside the outdoor housing and including:

[0052] a rectification circuit for rectifying alternating current into direct current;

[0053] a power factor correction circuit, an input end of which is connected to an output end of the rectification circuit;

[0054] a filtering circuit connected to an output end of the power factor correction circuit and including:

[0055] an electrolytic capacitor having a negative electrode;

[0056] a first power module, two input ends of which are connected to the filtering circuit, and the first power module is connected to the compressor to drive the compressor to operate;

[0057] a current detection resistor, a first end of which is connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to a ground end of a power supply of the first power module;

[0058] a switching power supply circuit for supplying power to the first power module and including:

[0059] a power supply chip;

[0060] a transformer including a primary winding and a secondary winding, a first end of the primary winding is connected to a ground end of the power supply of the power supply chip and then connected to the negative electrode of the electrolytic capacitor, a first end of the secondary winding is connected to the first end of the primary winding, so that the ground ends of the primary winding and the secondary winding are directly connected, and the ground end of the secondary winding is connected to the electrolytic capacitor, avoiding that after the secondary winding is connected to other circuits and winds around to the negative electrode of the electrolytic capacitor, being able to reduce the path between the ground end of the secondary winding and the negative electrode of the electrolytic capacitor, without interference of a large loop, making the voltage output by the switching power supply circuit more stable. Description of the Drawings

[0061] Figure 1 Shows a front view of an outdoor unit of an air conditioner according to some embodiments;

[0062] Figure 2 Shows a side view of an outdoor unit of an air conditioner according to some embodiments;

[0063] Figure 3 Shows a perspective view of an outdoor unit of an air conditioner according to some embodiments;

[0064] Figure 4 Shows a partial structural view of an outdoor unit of an air conditioner according to some embodiments;

[0065] Figure 5 Shows a partial structural view of an outdoor unit of an air conditioner from another perspective according to some embodiments;

[0066] Figure 6 Shows a partial structural view of an electronic control board according to some embodiments;

[0067] Figure 7 Shows a partial structural circuit diagram of an electronic control board according to some embodiments;

[0068] Figure 8 Shows a circuit diagram of a rectifier circuit according to some embodiments;

[0069] Figure 9 Shows another partial structural circuit diagram of an electronic control board according to some embodiments;

[0070] Figure 10 Shows another partial structural circuit diagram of an electronic control board according to some embodiments;

[0071] Figure 11 Shows another partial structural circuit diagram of an electronic control board according to some embodiments;

[0072] Figure 12 Shows another partial structural circuit diagram of an electronic control board according to some embodiments;

[0073] Figure 13 Shows another partial structural circuit diagram of an electronic control board according to some embodiments.

[0074] In the above figures: air conditioner outdoor unit 100; outdoor unit housing 1; outdoor air inlet 11; outdoor air outlet 12; compressor chamber 131; fan chamber 132; outdoor heat exchanger 21; outdoor fan 22; outdoor fan blade 221; outdoor motor 222; compressor 31; middle partition board 41; electric control box 51; electric control board 52; substrate 521; AC input circuit 522; first power input terminal 5221; second power input terminal 5222; rectifying circuit 523; power factor correction circuit 524; electrolytic capacitor 525; first power module 526; main control circuit 5271; grounding conductive surface 52711; first conducting wire 5273; current detection and protection circuit 5274; second power module 5275; voltage regulator 5276; switching power supply circuit 528; power supply chip 5281; transformer 5282; primary winding 52821; secondary winding 52822. Detailed implementation manners

[0075] To make the objectives and implementation manners of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application with reference to the accompanying drawings in the exemplary embodiments of this application. Apparently, the described exemplary embodiments are only a part rather than all of the embodiments of this application.

[0076] It should be noted that the brief descriptions of the terms in this application are only for facilitating the understanding of the subsequent described implementation manners, rather than intending to limit the implementation manners of this application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0077] In this application, the terms "first", "second", "third", etc. in the description, claims and the above-mentioned drawings are used to distinguish similar or like objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances.

[0078] The terms "include" and "have" and any variations thereof are intended to cover but not exclusively include. For example, a product or device including a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components not clearly listed or inherent to these products or devices.

[0079] This application provides an air conditioner, and the air conditioner will be described below with reference to the accompanying drawings.

[0080] In this application, the air conditioner may include an indoor part.

[0081] In this application, the indoor part may include an indoor air inlet. The indoor air inlet is the entrance for air to enter the indoor unit housing.

[0082] In the present application, the indoor part may include an indoor air outlet. The indoor air outlet is an outlet for the air inside the indoor casing to flow out of the indoor casing.

[0083] In the present application, the indoor part may include an indoor heat exchanger. The indoor heat exchanger can be used for heat exchange with air.

[0084] In the present application, the indoor part may include an indoor fan. The indoor fan can provide power for the flow of air.

[0085] In the present application, the indoor part may be an indoor unit of an air conditioner. The indoor unit of the air conditioner may include a main body. The main body may at least include a first cavity. The first cavity may be located inside the main body.

[0086] In the present application, the main body may include an indoor casing. An indoor air inlet may be formed on the indoor casing. The indoor air inlet may communicate with the first cavity. An indoor air outlet may be formed on the indoor casing. The indoor air outlet may communicate with the first cavity.

[0087] In the present application, the main body may include an indoor heat exchanger. The indoor heat exchanger may be disposed in the first cavity. The indoor heat exchanger can be used for heat exchange with the air in the first cavity.

[0088] In the present application, the main body may include an indoor fan. The indoor fan may be disposed in the first cavity. The indoor fan may be located on the side of the indoor heat exchanger away from the indoor air inlet. The indoor fan can be used for providing power for the flow of air.

[0089] In the present application, the indoor fan can drive the air to enter the first cavity from the indoor air inlet for heat exchange with the indoor heat exchanger, and the air after heat exchange with the indoor heat exchanger can flow out of the first cavity through the indoor air outlet.

[0090] In the present application, the air conditioner may include an outdoor part.

[0091] In the present application, the outdoor part may include an outdoor air inlet. The outdoor part may include an outdoor air outlet.

[0092] In the present application, the outdoor part may include an outdoor heat exchanger.

[0093] In the present application, the outdoor part may include an outdoor fan.

[0094] In the present application, referring to Figures 1 - 3 , the outdoor part may be the outdoor unit 100 of the air conditioner. The outdoor unit of the air conditioner may be connected to the indoor unit of the air conditioner.

[0095] In the present application, referring to Figures 1 - 3 , the outdoor unit of the air conditioner may include an outdoor casing 1. An outdoor accommodation space may be formed inside the outdoor casing.

[0096] In this application, the outdoor unit of the air conditioner can have a height direction. The height direction of the outdoor unit of the air conditioner is from the bottom of the outdoor unit of the air conditioner to the top of the outdoor unit of the air conditioner.

[0097] In this application, the outdoor unit of the air conditioner can have a length direction. The length direction of the outdoor unit of the air conditioner can be from one end of the outdoor unit of the air conditioner to the other end of the outdoor unit of the air conditioner.

[0098] In this application, the outdoor unit of the air conditioner can have a front-rear direction. Among the front-rear direction, the length direction, and the height direction of the outdoor unit of the air conditioner, any two of them can be perpendicular to each other. The height direction of the outdoor unit of the air conditioner can be parallel to the vertical direction, so that the outdoor unit of the air conditioner can be vertically arranged.

[0099] In this application, referring to Figures 1 - 3 , an outdoor air inlet 11 can be provided on the outdoor unit housing. The outdoor air inlet can communicate with the outdoor accommodation space. The outdoor air inlet can be used to introduce outdoor air into the outdoor accommodation space.

[0100] In this application, referring to Figures 1 - 3 , an outdoor air outlet 12 can be provided on the outdoor unit housing. The outdoor air outlet can communicate with the outdoor accommodation space. The outdoor air outlet can be used to lead the air in the outdoor accommodation space out of the outdoor accommodation space.

[0101] In this application, referring to Figures 4 - 5 , the outdoor unit of the air conditioner can include an outdoor heat exchanger 21. The outdoor heat exchanger can be provided inside the outdoor unit housing. Among them, the outdoor heat exchanger can be provided inside the outdoor accommodation space.

[0102] In this application, referring to Figures 4 - 5 , the outdoor unit of the air conditioner can include an outdoor fan 22. The outdoor fan can be provided inside the outdoor unit housing. The outdoor fan can be provided inside the outdoor accommodation space.

[0103] In this application, the outdoor fan is located on the side of the outdoor heat exchanger close to the outdoor air outlet. The rotation of the outdoor fan causes outdoor air to enter the outdoor accommodation space from the outdoor air inlet and exchange heat with the outdoor heat exchanger, and the heated outdoor air flows out of the outdoor accommodation space through the outdoor air outlet.

[0104] In this application, referring to Figures 4 - 5 , the outdoor fan can include an outdoor fan blade 221. The outdoor fan blade can rotate to drive air flow.

[0105] In this application, referring to Figures 4 - 5 , the outdoor fan can include an outdoor motor 222. The outdoor motor can provide power for the rotation of the outdoor fan blade.

[0106] In this application, referring to Figures 4 - 5, the air conditioner may include a compressor 31. The compressor is disposed within the outdoor housing. The compressor may be disposed within the outdoor accommodation space.

[0107] In the present application, the air conditioner may include a throttling device. The throttling device is used for throttling. The throttling device may be disposed within the outdoor accommodation space.

[0108] In the present application, among the indoor heat exchanger and the outdoor heat exchanger, one of them is a condenser and the other is an evaporator.

[0109] In the present application, the air conditioner performs the refrigeration cycle of the air conditioner by using a compressor, a condenser, a throttling device, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0110] In the present application, the compressor compresses the refrigerant gas in the low-temperature and low-pressure state and discharges the refrigerant gas in the high-temperature and high-pressure state. The discharged refrigerant gas flows into the condenser.

[0111] In the present application, the condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0112] In the present application, the throttling device expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant.

[0113] In the present application, the evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant gas in the low-temperature and low-pressure state to the compressor. The evaporator can achieve the refrigeration effect by using the latent heat of evaporation of the refrigerant for heat exchange with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0114] In the present application, when the indoor heat exchanger is used as a condenser, the air conditioner serves as a heater in the heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0115] In the present application, referring to Figures 4 - 5 , the outdoor unit of the air conditioner may include a middle partition 41. The middle partition 41 may be disposed within the outdoor housing. The middle partition divides the outdoor accommodation space into a compressor chamber 131 and a blower chamber 132.

[0116] The compressor may be disposed within the compressor chamber. The outdoor blower may be located within the blower chamber 132.

[0117] In the present application, referring to Figures 4 - 5 , the outdoor unit of the air conditioner may include an electric control box 51. The electric control box may be disposed within the outdoor housing.

[0118] In the present application, referring toFigure 6 , the outdoor unit of the air conditioner may include an electronic control board 52. The electronic control board is used to control the operation of the compressor and the outdoor fan. The electronic control board may be located inside the electronic control box 51.

[0119] In this application, the electrical box may be located above the compressor.

[0120] In this application, referring to Figure 6 , the electronic control board may include a substrate 521.

[0121] In this application, referring to Figure 6 , the electronic control board may include an AC input circuit 522 to introduce alternating current.

[0122] In this application, referring to Figure 7 , the AC input circuit may include a first power input terminal 5221. The AC input circuit may include a second power input terminal 5222. The first power input terminal and the second power input terminal may be used to introduce alternating current.

[0123] In this application, referring to Figures 6 - 7 , the electronic control board may include a rectification circuit 523. The rectification circuit is used to rectify the alternating current provided by the AC power supply into direct current.

[0124] In this application, the rectification circuit 523 may be provided on the substrate.

[0125] In this application, the rectification circuit may be connected to the first power input terminal and the second power input terminal.

[0126] In this application, the rectification circuit may include a rectifier bridge.

[0127] In this application, the first power input terminal and the second power input terminal may be respectively connected to two input terminals on the AC side of the rectifier bridge.

[0128] In this application, referring to Figures 6 - 7 , the electronic control board may include a power factor correction circuit 524. The power factor correction circuit may be used to perform power factor correction on the direct current output by the rectification circuit.

[0129] In this application, the power factor correction circuit may be provided on the substrate.

[0130] In this application, the input terminal of the power factor correction circuit may be connected to the output terminal of the rectification circuit.

[0131] In this application, two output terminals on the DC side of the rectifier bridge may be connected to the power factor correction circuit.

[0132] In this application, referring to Figure 8, the rectifier bridge may include diodes. The number of diodes in the rectifier bridge may be four. The four diodes of the rectifier bridge VC1 may be a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4 respectively.

[0133] In the present application, the first power input terminal is connected to the anode of the first diode and the cathode of the third diode. The second power input terminal is connected to the anode of the second diode and the cathode of the fourth diode.

[0134] In the present application, referring to Figure 7 , the power factor correction circuit may include a first inductor L1.

[0135] In the present application, the power factor correction circuit may include an IGBT (Insulated Gate Bipolar Transistor).

[0136] In the present application, the power factor correction circuit may include a fifth diode D5.

[0137] In the present application, referring to Figure 7 , the first end of the first inductor L1 is connected to the first output terminal of the rectifier circuit. The collector C of the IGBT is connected to the second end of the first inductor L1.

[0138] The emitter E of the IGBT is connected to the second output terminal of the rectifier circuit. Alternatively, the emitter E of the IGBT is connected to the second output terminal of the rectifier circuit through a second resistor R2.

[0139] The anode of the fifth diode is connected to the second end of the first inductor L1 and the collector C of the IGBT.

[0140] In the present application, the first end of the first inductor L1 is connected to the cathode of the first diode and the cathode of the second diode.

[0141] In the present application, the emitter E of the IGBT is connected to the anode of the third diode and the anode of the fourth diode. Alternatively, the emitter E of the IGBT is connected to the anode of the third diode and the anode of the fourth diode through a second resistor R2.

[0142] In the present application, referring to Figure 7 , the electronic control board may include a filtering circuit. The filtering circuit is used to filter out the ripple in the rectified output voltage, so as to obtain a smooth direct current.

[0143] The filtering circuit may include an electrolytic capacitor 525. The electrolytic capacitor is connected in parallel with the power factor correction circuit at the output terminal of the power factor correction circuit.

[0144] In the present application, the electrolytic capacitor may be arranged on the substrate.

[0145] In the present application, the electrolytic capacitor may have a positive electrode and a negative electrode. The positive electrode of the electrolytic capacitor is connected to the cathode of the fifth diode.

[0146] In the present application, the negative electrode of the electrolytic capacitor is connected to the emitter of the IGBT.

[0147] In the present application, referring to Figure 7 , the electronic control board may include a first power module 526. Two input terminals of the first power module are connected to the filter circuit. Among them, the two input terminals of the first power module are respectively connected to the positive electrode and the negative electrode of the electrolytic capacitor. The first power module is connected to the compressor to drive the compressor to operate.

[0148] In the present application, the first power module is disposed on the substrate.

[0149] In the present application, the electronic control board may include a current detection resistor R1. The current detection resistor is used to calculate the operating current of the compressor according to the voltage and the resistance.

[0150] In the present application, the first end of the current detection resistor is connected to the negative electrode of the electrolytic capacitor.

[0151] In the present application, the first end of the current detection resistor is connected to the power supply ground terminal GND1 of the first power module.

[0152] In the present application, the second end of the current detection resistor is connected to the negative DC link input terminal of the first power module to detect the current of the first power module driving the compressor.

[0153] In the present application, the negative DC link input terminal of the first power module includes a U-phase negative DC link input terminal NU. The negative DC link input terminal of the first power module includes a V-phase negative DC link input terminal NV. The negative DC link input terminal of the first power module includes a W-phase negative DC link input terminal NW.

[0154] In the present application, the current detection resistor may be disposed on the substrate.

[0155] In the present application, referring to Figures 9 - 11 , the electronic control board may include a main control circuit 5271. Among them, the main control circuit may be disposed on the substrate.

[0156] In the present application, the power supply ground terminal of the main control circuit is connected to the ground conductive surface 52711 of the main control circuit to ground the power supply ground terminal of the main control circuit. The ground conductive surface of the main control circuit is connected to the first end of the current detection resistor through the first wire 5273.

[0157] In the present application, referring to Figures 9 - 11, the electronic control board may include a current detection and protection circuit 5274. The current detection and protection circuit can be used to protect the compressor to avoid excessive operating current of the compressor. The power ground terminal of the current detection and protection circuit can be connected to the ground conductive surface of the main control circuit.

[0158] Set the first end of the current detection resistor to be connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to the power supply ground terminal of the first power module, and the power supply ground terminal of the main control circuit is connected to the ground conductive surface of the main control circuit; the ground conductive surface of the main control circuit is connected to the first end of the current detection resistor through the first wire, so that the power supply ground terminal of the main control circuit is connected to the ground terminal of the current detection resistor, so that the grounding point for the signal acquisition reference of the main control circuit is the same as the grounding point for the reference of the first power module, so that the signal acquisition of the main control circuit is less affected by the first power module, so that the signal collected by the main control circuit is accurate, reducing misjudgment, avoiding frequent generation of faults, and avoiding burning out the first power module; set the power supply ground terminal of the current detection and protection circuit to be connected to the ground conductive surface of the main control circuit, so that the reference grounding point of the signal obtained by the current detection and protection circuit is the same as the reference grounding point of the signal obtained by the main control circuit, so that the error and fluctuation of the signal of the current detection and protection circuit and the signal of the main control circuit are small, reducing misjudgment.

[0159] In the present application, the current detection and protection circuit can be provided on the substrate.

[0160] In the present application, the substrate has a length direction.

[0161] In the present application, reference Figures 9 - 11 , along the length direction of the substrate, the current detection resistor is provided between the first power module and the main control circuit.

[0162] In the present application, the length of the first wire is the first length L.

[0163] In the present application, the first length L ≤ the third parameter value. The third parameter value can be any value in 15 - 25 mm. The third parameter value can be 20 mm. The first length L ≤ 20 mm. It can avoid the first wire being too long, avoid too many circuits that the first wire passes through, avoid the circuits passed through affecting the voltage and causing a large voltage difference, avoid the large voltage difference making the signal obtained by the main control circuit inaccurate, and keep the interference within a certain range.

[0164] In this application, a current detection resistor is arranged between the first power module and the main control circuit, so that the distances among the first power module, the current detection resistor, and the main control circuit can be set relatively close, L≤20mm, which can avoid the first conductive wire being too long, avoid too many circuits through which the first conductive wire passes, avoid the circuits passed through affecting the voltage and causing a large voltage difference, avoid the large voltage difference making the signal obtained by the main control circuit inaccurate, and keep the interference within a certain range.

[0165] In this application, along the length direction of the substrate, the distance between the current detection and protection circuit and the current detection resistor is less than the distance between the main control circuit and the current detection resistor.

[0166] Setting the distance between the current detection and protection circuit and the current detection resistor to be less than the distance between the main control circuit and the current detection resistor makes the input signal of the current detection and protection circuit relatively stable.

[0167] In this application, the substrate includes a first end of the substrate and a second end of the substrate arranged in the length direction of the substrate.

[0168] In this application, the first power module is located on the side of the current detection resistor close to the first end of the substrate.

[0169] In this application, the main control circuit is located on the side of the current detection resistor close to the second end of the substrate.

[0170] In this application, the current detection and protection circuit is located on the side of the current detection resistor close to the second end of the substrate.

[0171] In this application, the substrate has a width direction. The width direction of the substrate can be perpendicular to the length direction of the substrate.

[0172] In this application, along the width direction of the substrate, the current detection and protection circuit is located between the electrolytic capacitor and the main control circuit.

[0173] Setting the current detection and protection circuit to be located between the electrolytic capacitor and the main control circuit makes the distance between the current detection and protection circuit and the main control circuit relatively close, and makes the output signal of the current detection and protection circuit relatively stable.

[0174] In this application, the substrate includes a third end of the substrate and a fourth end of the substrate arranged in the width direction of the substrate.

[0175] In this application, the current detection and protection circuit is located on the side of the main control circuit close to the fourth end of the substrate.

[0176] In this application, the electrolytic capacitor is located on the side of the current detection and protection circuit close to the fourth end of the substrate.

[0177] In this application, the width of the first conductive wire is the first width W.

[0178] In this application, the first width W ≤ the first parameter value. The first parameter value can be any value in the range of 2 mm - 3 mm. The first parameter value can be 2 mm. The first width W ≤ 2 mm. This is to avoid non-single-point grounding between the first conductive wire and other wires, which may cause problems between the current detection resistor and the ground conductive surface due to an overly wide first width.

[0179] In this application, the first width W ≥ the second parameter value. The second parameter value can be any value between 0.5 mm - 1.5 mm. The second parameter value can be 1 mm. The first width W ≥ 1 mm. This is to avoid unstable connection between the current detection resistor and the ground conductive surface due to an overly narrow first width, and to ensure reliable connection between the two.

[0180] In this application, 1 mm ≤ W ≤ 2 mm. This is to avoid non-single-point grounding between the first conductive wire and other wires, which may cause problems between the current detection resistor and the ground conductive surface due to an overly wide first width, and to avoid unstable connection between the current detection resistor and the ground conductive surface due to an overly narrow first width, and to ensure reliable connection between the two.

[0181] In this application, refer to Figure 13 , the electronic control board may include a second power module 5275.

[0182] Two input terminals of the second power module are respectively connected to the positive and negative electrodes of the electrolytic capacitor. The second power module is connected to the outdoor fan to drive the outdoor fan to operate.

[0183] In this application, the power ground terminal of the second power module is connected to the negative electrode of the electrolytic capacitor.

[0184] In this application, along the length direction of the substrate, the second power module is located on the side of the main control circuit away from the first power module.

[0185] In this application, the second power module is located on the side of the main control circuit close to the second end of the substrate.

[0186] In this application, the main control circuit integrates a logic controller, a memory, a data processor, etc., as well as software programs and / or modules stored on the memory and executable on the data processor.

[0187] By running or executing the software programs and / or modules stored in the memory, and by calling the data stored in the memory, the main control circuit outputs corresponding control signals to the first power module and the second power module to drive loads such as the outdoor fan and the compressor to operate.

[0188] In this application, refer to Figures 12 - 13, the electronic control board includes a switching power supply circuit 528. The switching power supply circuit is used to supply power to the main control circuit. The switching power supply circuit is used to supply power to the first power module. The switching power supply circuit is used to supply power to the second power module.

[0189] In this application, referring to Figures 12 - 13 , the switching power supply circuit may include a power chip 5281.

[0190] In this application, referring to Figures 12 - 13 , the switching power supply circuit may include a transformer 5282.

[0191] In this application, referring to Figures 12 - 13 , the transformer may include a primary winding 52821. The transformer may include a secondary winding 52822.

[0192] In this application, the first end of the primary winding is connected to the power ground terminal of the power chip and then connected to the negative electrode of the electrolytic capacitor.

[0193] In this application, the first end of the secondary winding is connected to the first end of the primary winding, so that the grounding ends of the primary winding and the secondary winding are directly connected, and the grounding end of the secondary winding is connected to the electrolytic capacitor, avoiding that after the secondary winding is connected to other circuits and then winds around to the negative electrode of the electrolytic capacitor, which can reduce the path between the grounding end of the secondary winding and the negative electrode of the electrolytic capacitor, without the interference of large loops, making the voltage output by the switching power supply circuit more stable.

[0194] In this application, referring to Figures 12 - 13 , the switching power supply circuit may include a sixth diode D6. The anode of the sixth diode D6 is connected to the second end of the secondary winding.

[0195] In this application, referring to Figures 12 - 13 , the switching power supply circuit may include a first capacitor C1. The positive electrode of the first capacitor C1 is connected to the cathode of the sixth diode. The negative electrode of the first capacitor is connected to the first end of the secondary winding, so that the negative electrode of the first capacitor is directly connected to the first end of the secondary winding, and the negative electrode of the first capacitor is connected to the electrolytic capacitor, avoiding that after the negative electrode of the first capacitor is connected to other circuits and then winds around to the negative electrode of the electrolytic capacitor, which can reduce the path between the negative electrode of the first capacitor and the negative electrode of the electrolytic capacitor, without the interference of large loops, making the voltage output by the switching power supply circuit more stable.

[0196] In this application, referring to Figures 12 - 13 , the first voltage output terminal between the positive electrode of the first capacitor and the cathode of the sixth diode is connected to the positive power supply terminal of the main control circuit and the positive power supply terminal of the current detection and protection circuit through a voltage regulator 5276, so that the switching power supply circuit supplies power to the main control circuit and the current detection and protection circuit, reducing the error and fluctuation between the current detection and protection circuit and the main control circuit to be small, and reducing misjudgment.

[0197] In this application, referring to Figures 12 - 13 , the switching power supply circuit includes a seventh diode D7.

[0198] In this application, referring to Figures 12 - 13 , the switching power supply circuit includes a second capacitor C2.

[0199] In this application, referring to Figures 12 - 13 , the third end of the secondary winding is connected to the anode of the seventh diode. The cathode of the seventh diode is connected to the positive electrode of the second capacitor.

[0200] The second end of the secondary winding is located between the third end and the first end of the secondary winding.

[0201] The negative electrode of the second capacitor is connected to the first end of the secondary winding, so that the negative electrode of the second capacitor is directly connected to the first end of the secondary winding, so that the negative electrode of the second capacitor is connected to the electrolytic capacitor, avoiding that after the negative electrode of the second capacitor is connected to other circuits and then winding around to the negative electrode of the electrolytic capacitor, which can reduce the path between the negative electrode of the second capacitor and the negative electrode of the electrolytic capacitor, without the interference of large loops, making the voltage output by the switching power supply circuit more stable.

[0202] In this application, referring to Figures 12 - 13 , the second voltage output terminal between the positive electrode of the second capacitor and the cathode of the seventh diode is connected to the positive power supply terminal of the first power module, so that the switching power supply circuit supplies power to the first power module.

[0203] In this application, referring to Figures 12 - 13 , the second voltage output terminal between the positive electrode of the second capacitor and the cathode of the seventh diode is connected to the positive power supply terminal of the second power module, so that the switching power supply circuit supplies power to the second power module.

[0204] In this application, the first voltage output terminal outputs a 15V voltage.

[0205] In this application, the second voltage output terminal outputs a 12V voltage.

[0206] In this application, the switching power supply circuit is located on one side of the electrolytic capacitor close to the second end of the substrate.

[0207] In this application, the first inductor of the power factor correction circuit is located on one side of the electrolytic capacitor close to the fourth end of the substrate.

[0208] In this application, the rectifying circuit is located on one side of the first inductor close to the first end of the substrate.

[0209] In this application, the IGBT of the power factor correction circuit is located on one side of the electrolytic capacitor close to the first end of the substrate.

[0210] In the present application, along the width direction of the substrate, the IGBT of the power factor correction circuit is located between the first power module and the rectifier circuit.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application.

[0212] For ease of explanation, the above description has been made in connection with specific embodiments. However, the above exemplary discussions are not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that, Comprising: An air conditioner indoor unit and an air conditioner outdoor unit, the air conditioner outdoor unit comprising: An outdoor machine case, on which an outdoor air inlet and an outdoor air outlet are formed; An outdoor heat exchanger, disposed inside the outdoor machine case; An outdoor fan, disposed inside the outdoor machine case and located on a side of the outdoor heat exchanger close to the outdoor air outlet; A compressor, disposed inside the outdoor machine case; An electronic control board, disposed inside the outdoor machine case and comprising: A rectification circuit, for rectifying alternating current into direct current; A power factor correction circuit, whose input end is connected to the output end of the rectification circuit; A filtering circuit, connected to the output end of the power factor correction circuit and comprising: An electrolytic capacitor, which has a negative electrode; A first power module, whose two input ends are connected to the filtering circuit, and the first power module is connected to the compressor to drive the compressor to work; A current detection resistor, a first end of the current detection resistor is connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to the ground end of the power supply of the first power module; A main control circuit, the ground end of the power supply of the main control circuit is connected to the grounding conductive surface of the main control circuit; the grounding conductive surface of the main control circuit is connected to the first end of the current detection resistor through a first conducting wire; A current detection and protection circuit, for protecting the compressor, the ground end of the power supply of the current detection and protection circuit is connected to the grounding conductive surface of the main control circuit.

2. The air conditioner according to claim 1, wherein The electronic control board comprises a substrate; the first power module, the current detection resistor, the main control circuit and the current detection and protection circuit are disposed on the substrate; the substrate has a length direction; Along the length direction of the substrate, the current detection resistor is disposed between the first power module and the main control circuit; Along the length direction of the substrate, the distance between the current detection and protection circuit and the current detection resistor is less than the distance between the main control circuit and the current detection resistor; The length of the first conducting wire is a first length L, L≤20mm.

3. The air conditioner according to claim 1, characterized in that, The width of the first conducting wire is a first width W, 1mm≤W≤2mm.

4. The air conditioner according to claim 1, wherein, The electronic control board comprises: A switching power supply circuit, for supplying power to the first power module, the main control circuit and the current detection and protection circuit, the switching power supply circuit comprising: A power supply chip; A transformer, including a primary winding and a secondary winding, a first end of the primary winding is connected to the ground end of the power supply of the power supply chip and then connected to the negative electrode of the electrolytic capacitor, and a first end of the secondary winding is connected to the first end of the primary winding.

5. The air conditioner according to claim 4, wherein, The switching power supply circuit comprises: A sixth diode, whose anode is connected to the second end of the secondary winding; A first capacitor, whose positive electrode is connected to the cathode of the sixth diode, and whose negative electrode is connected to the first end of the secondary winding.

6. The air conditioner according to claim 5, wherein, A first voltage output end between the positive electrode of the first capacitor and the cathode of the sixth diode is connected to the positive power supply end of the main control circuit and the positive power supply end of the current detection and protection circuit through a voltage regulator.

7. The air conditioner according to claim 4, wherein The switching power supply circuit comprises: A seventh diode, whose anode is connected to the third end of the secondary winding, and the second end of the secondary winding is located between the third end and the first end of the secondary winding; A second capacitor, whose negative electrode is connected to the first end of the secondary winding and whose positive electrode is connected to the cathode of the seventh diode.

8. The air conditioner according to claim 7, characterized in that, A second voltage output terminal between the positive electrode of the second capacitor and the cathode of the seventh diode is connected to the positive terminal of the power supply of the first power module.

9. The air conditioner according to claim 1, wherein, The electronic control board includes: A second power module, whose two input terminals are respectively connected to the positive electrode and the negative electrode of the electrolytic capacitor. The second power module is connected to the outdoor fan to drive the outdoor fan to operate; the power supply ground terminal of the second power module is connected to the negative electrode of the electrolytic capacitor.

10. An air conditioner, characterized in that, Comprising: An air conditioner indoor unit and an air conditioner outdoor unit, the air conditioner outdoor unit includes: An outdoor machine case, on which an outdoor air inlet and an outdoor air outlet are formed; An outdoor heat exchanger, disposed inside the outdoor machine case; An outdoor fan, disposed inside the outdoor machine case and located on one side of the outdoor heat exchanger close to the outdoor air outlet; A compressor, disposed inside the outdoor machine case; An electronic control board, disposed inside the outdoor machine case and including: A rectification circuit for rectifying alternating current into direct current; A power factor correction circuit, whose input terminal is connected to the output terminal of the rectification circuit; A filter circuit, connected to the output terminal of the power factor correction circuit and including: An electrolytic capacitor, which has a negative electrode; A first power module, whose two input terminals are connected to the filter circuit. The first power module is connected to the compressor to drive the compressor to operate; A current detection resistor, the first end of the current detection resistor is connected to the negative electrode of the electrolytic capacitor; the first end of the current detection resistor is connected to the power supply ground terminal of the first power module; A switching power supply circuit for supplying power to the first power module and including: A power supply chip; A transformer, including a primary winding and a secondary winding. The first end of the primary winding is connected to the power supply ground terminal of the power supply chip and then connected to the negative electrode of the electrolytic capacitor. The first end of the secondary winding is connected to the first end of the primary winding.

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