Compressor frequency converter circuit

Abstract

The embodiment of the utility model provides a compressor frequency converter circuit. The compressor frequency converter circuit comprises a first switch unit which is coupled between an output end of an input circuit and a grounding end; the pre-stage voltage detection end of the main control chip is coupled with the first sub-output end; the post-stage voltage detection end is coupled with the output end of the input circuit; the current detection end is coupled with the second sub-output end; the switch control end is coupled with the driving end of the first switch unit; the main control chip controls the conduction of the first switch unit according to an input signal; the output end of the input circuit is coupled to the power supply end of the main control chip; the motor three-phase output end is coupled with the frequency converter motor; the motor feedback end is coupled between the input end and the output end of the motor driving frequency conversion circuit; the main control chip adjusts the rotating speed of the frequency converter motor according to the feedback signal; the input end of the low-voltage conversion circuit is coupled with the output end of the high-voltage conversion circuit. The motor frequency conversion circuit is directly driven through the main control chip, no extra driving chip is needed, and the manufacturing cost and the maintenance complexity are reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressor circuits, and in particular to a compressor inverter circuit. Background Art

[0002] In the context of the rapid development of modern household appliance technology, especially in the refrigerator industry, the integration of high-efficiency energy saving and intelligent control technology has become a key development trend. The refrigerator compressor control system in related technologies mostly adopts fixed frequency and voltage output, which cannot be dynamically adjusted according to the actual refrigeration demand, resulting in low energy efficiency and limited control accuracy. To meet this challenge, a variety of variable frequency compressor technologies have appeared on the market, aiming to improve the energy efficiency ratio and intelligent control level of refrigerator compressors. However, some variable frequency refrigerator compressor inverter circuit designs in the existing technology still face several deficiencies:

[0003] In related technologies, refrigerator compressor frequency conversion circuit design often uses complex links such as multi-level voltage, current detection and switch control, and often requires additional driver chips to intervene in the motor driving process, which not only increases the complexity of system components, but also increases manufacturing costs. The existence of redundant components makes the overall system maintenance and troubleshooting cumbersome.

[0004] Since an additional driver chip is used in the motor drive link, it not only takes up space, but may also cause delays in the signal transmission link, affecting the instant response speed of the control, reducing the overall system's agility in dynamically adjusting the motor speed, and affecting the energy efficiency and temperature control accuracy of the refrigerator. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a compressor inverter circuit to solve the problems in the related art.

[0006] A first aspect of the present disclosure provides a compressor inverter circuit, comprising:

[0007] The input circuit comprises a first switch unit, wherein the first switch unit is coupled between an output terminal of the input circuit and a ground terminal;

[0008] The main control chip includes: a front-stage voltage detection terminal, a rear-stage voltage detection terminal, a current detection terminal, a switch control terminal, a main control chip power supply terminal, a motor three-phase output terminal, and a motor feedback terminal;

[0009] The front-stage voltage detection terminal is coupled to the first sub-output terminal between the input terminal and the output terminal of the input circuit through the front-stage voltage detection circuit;

[0010] The rear-stage voltage detection terminal is coupled to the output terminal of the input circuit through a rear-stage voltage detection circuit;

[0011] The current detection terminal is coupled to the second sub-output terminal between the input terminal and the output terminal of the input circuit through a current detection circuit;

[0012] The switch control terminal is coupled to the driving terminal of the first switch unit through a driving circuit; the main control chip controls the conduction of the first switch unit through the switch control terminal according to the input signals of the front-stage voltage detection terminal and the rear-stage voltage detection terminal, thereby controlling the output voltage of the input circuit;

[0013] The output end of the input circuit is coupled to the power supply end of the main control chip through a high-voltage conversion circuit;

[0014] The three-phase output terminal of the motor is coupled to the inverter motor through the motor drive frequency conversion circuit; the motor feedback terminal is coupled between the input terminal and the output terminal of the motor drive frequency conversion circuit; the main control chip adjusts the on-off of the motor drive frequency conversion circuit through the three-phase output terminal of the motor according to the feedback signal of the motor feedback terminal, thereby adjusting the speed of the inverter motor;

[0015] A low voltage conversion circuit, wherein the input end of the low voltage conversion circuit is coupled to the output end of the high voltage conversion circuit, and the output end of the low voltage conversion circuit outputs a working voltage.

[0016] Optionally, the input circuit further includes:

[0017] The three-phase input terminal includes a live wire input terminal, a neutral wire input terminal and a ground wire input terminal; the ground wire input terminal is grounded;

[0018] The common mode suppression inductor comprises a first winding and a second winding; the live wire input end is coupled to one end of the first winding via a fuse and a magnetic ring in sequence; the neutral wire input end is coupled to one end of the second winding via a magnetic ring; the other ends of the first winding and the second winding are coupled to the output end of the input circuit via a rectifier bridge;

[0019] an adjustable resistor coupled between one end of the first winding and one end of the second winding;

[0020] A first capacitor connected in parallel with the adjustable resistor;

[0021] A first resistor string is connected in parallel with the first capacitor, wherein the first resistor string includes a first resistor, a second resistor, and a third resistor connected in sequence;

[0022] a second capacitor, one end of the second capacitor being coupled to the other end of the first winding, and the other end of the second capacitor being coupled to the other end of the second winding via a third capacitor and a fourth resistor in sequence;

[0023] a fourth capacitor, one end of the fourth capacitor being coupled to the first input end of the rectifier bridge, and the other end of the fourth capacitor being coupled to the second input end of the rectifier bridge via the first inductor;

[0024] A second inductor is coupled between the output end of the rectifier bridge and the output end of the input circuit;

[0025] The first sub-output terminal is arranged between the output terminal of the rectifier bridge and the second inductor;

[0026] a first diode, wherein an anode of the first diode is coupled to the second inductor, and a cathode of the first diode is coupled to an output end of the input circuit;

[0027] a fifth resistor, one end of the fifth resistor being coupled to the second sub-output end, and the other end of the fifth resistor being coupled to the driving end of the first switch unit through a sixth resistor; a first end of the first switch unit being coupled to the second inductor, and a second end of the first switch unit being coupled to ground; and the sixth resistor being grounded;

[0028] The connection point between the fifth resistor and the fourth capacitor is the second sub-output terminal;

[0029] a fifth capacitor, one end of the fifth capacitor being coupled to a connection point between the second capacitor and the third capacitor, and the other end of the fifth capacitor being coupled to a third input end of the rectifier bridge;

[0030] A connection point between the second capacitor and the third capacitor is grounded;

[0031] a sixth capacitor, the sixth capacitor being connected in parallel with the sixth resistor;

[0032] A seventh capacitor and a first energy storage filter capacitor are connected in parallel between the output terminal of the input circuit and the ground terminal; one end of the seventh capacitor is coupled to the first diode.

[0033] Optionally, the front-stage voltage detection circuit includes:

[0034] a seventh resistor, one end of the seventh resistor being coupled to the first sub-output end, and the other end of the seventh resistor being grounded through an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor in sequence;

[0035] a twelfth resistor, one end of the twelfth resistor being coupled to a connection point between the tenth resistor and the eleventh resistor, and the other end of the twelfth resistor being coupled to the front-stage voltage detection end;

[0036] An eighth capacitor is connected in parallel with the eleventh resistor.

[0037] Optionally, the post-stage voltage detection circuit includes:

[0038] a thirteenth resistor, one end of the thirteenth resistor is coupled to the output end of the input circuit, and the other end of the thirteenth resistor is grounded through a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor in sequence;

[0039] a seventeenth resistor, one end of the seventeenth resistor being coupled to a connection point between the fifteenth resistor and the sixteenth resistor, and the other end of the seventeenth resistor being coupled to the subsequent voltage detection end;

[0040] A ninth capacitor is connected in parallel with the sixteenth resistor.

[0041] Optionally, the three-phase output terminal of the motor includes: a first phase output terminal, a second phase output terminal, a third phase output terminal, a first upper driving terminal, a first lower driving terminal, a second upper driving terminal, a second lower driving terminal, a third upper driving terminal and a third lower driving terminal;

[0042] The three phases of the inverter motor are respectively coupled to the first phase output terminal, the second phase output terminal and the third phase output terminal;

[0043] The motor drive frequency conversion circuit comprises: a first phase control circuit, a second phase control circuit and a third phase control circuit;

[0044] The first phase control circuit comprises:

[0045] A second switch unit, wherein a first end of the second switch unit is coupled to the output end of the input circuit, and a second end of the second switch unit is coupled to the first phase output end;

[0046] a second diode, wherein an anode of the second diode is coupled to the control end of the second switch unit through a nineteenth resistor, and a cathode of the second diode is coupled to the first upper driving end;

[0047] a twentieth resistor, one end of which is coupled to the first upper driving end, and the other end of which is coupled to the first phase output end via a twenty-first resistor; and a connection point between the twenty-first resistor and the twenty-first resistor is coupled to the control end of the second switch unit;

[0048] a tenth capacitor, coupled between the control terminal and the second terminal of the second switch unit, and connected in parallel with the twenty-first resistor;

[0049] A third switch unit, wherein a first end of the third switch unit is coupled to a second end of the second switch unit, and a second end of the third switch unit is coupled to the motor feedback end;

[0050] a third diode, wherein an anode of the third diode is coupled to the control end of the third switch unit through a twenty-second resistor, and a cathode of the third diode is coupled to the first lower driving end;

[0051] a twenty-third resistor, one end of the twenty-third resistor being coupled to the first lower driving end, and the other end of the twenty-third resistor being coupled to the second end of the third switch unit through a twenty-fourth resistor;

[0052] an eleventh capacitor, coupled between the control terminal and the second terminal of the third switch unit, and connected in parallel with the twenty-fourth resistor;

[0053] And / or, the second phase control circuit includes:

[0054] a fourth switch unit, wherein a first end of the fourth switch unit is coupled to the output end of the input circuit, and a second end of the fourth switch unit is coupled to the second phase output end;

[0055] a fourth diode, an anode of the fourth diode being coupled to the control end of the fourth switch unit through a twenty-fifth resistor, and a cathode of the fourth diode being coupled to the second upper driving end;

[0056] a twenty-sixth resistor, one end of which is coupled to the second upper driving end, and the other end of which is coupled to the second phase output end via a twenty-seventh resistor; and a connection point between the twenty-sixth resistor and the twenty-seventh resistor is coupled to the control end of the fourth switch unit;

[0057] a twelfth capacitor, coupled between the control terminal and the second terminal of the fourth switch unit, and connected in parallel with the twenty-seventh resistor;

[0058] a fifth switch unit, wherein a first end of the fifth switch unit is coupled to a second end of the fourth switch unit, and a second end of the fifth switch unit is coupled to the motor feedback end;

[0059] a fifth diode, an anode of the fifth diode being coupled to the control end of the fifth switch unit through a twenty-eighth resistor, and a cathode of the fifth diode being coupled to the second lower driving end;

[0060] a twenty-ninth resistor, one end of the twenty-ninth resistor being coupled to the second lower driving end, and the other end of the twenty-ninth resistor being coupled to the second end of the fifth switch unit via a thirty-ninth resistor;

[0061] a thirteenth capacitor, coupled between the control terminal and the second terminal of the fifth switch unit, and connected in parallel with the thirtieth resistor;

[0062] And / or, the third phase control circuit includes:

[0063] a sixth switch unit, wherein a first end of the sixth switch unit is coupled to the output end of the input circuit, and a second end of the sixth switch unit is coupled to the third phase output end;

[0064] a sixth diode, an anode of the sixth diode being coupled to the control end of the sixth switch unit through a thirty-first resistor, and a cathode of the sixth diode being coupled to the third upper driving end;

[0065] a thirty-second resistor, one end of the thirty-second resistor being coupled to the third upper driving end, and the other end of the thirty-second resistor being coupled to the third phase output end via a thirty-third resistor; and a connection point between the thirty-second resistor and the thirty-third resistor being coupled to the control end of the sixth switch unit;

[0066] a fourteenth capacitor, coupled between the control terminal and the second terminal of the sixth switch unit, and connected in parallel with the thirty-third resistor;

[0067] a seventh switch unit, wherein a first end of the seventh switch unit is coupled to a second end of the sixth switch unit, and a second end of the seventh switch unit is coupled to the motor feedback end;

[0068] a seventh diode, an anode of the seventh diode being coupled to the control end of the seventh switch unit through a thirty-fourth resistor, and a cathode of the seventh diode being coupled to the third lower driving end;

[0069] a thirty-fifth resistor, one end of the thirty-fifth resistor being coupled to the third lower driving end, and the other end of the thirty-fifth resistor being coupled to the second end of the seventh switch unit via a thirty-sixth resistor;

[0070] The fifteenth capacitor is coupled between the control terminal and the second terminal of the seventh switch unit, and is connected in parallel with the thirty-sixth resistor.

[0071] Optionally, the main control chip further includes a motor current detection output terminal, including: a detection positive output terminal and a detection negative output terminal; the motor feedback terminal is grounded through a thirty-seventh resistor;

[0072] The motor current detection output terminal is coupled to both ends of the thirty-seventh resistor through a motor current detection circuit;

[0073] The motor current detection circuit comprises:

[0074] A thirty-eighth resistor, one end of the thirty-eighth resistor is coupled to the detection positive output end, and the other end of the thirty-eighth resistor is coupled to one end of the thirty-seventh resistor via a thirty-ninth resistor and a fortieth resistor in sequence;

[0075] a forty-first resistor, one end of the forty-first resistor being coupled between the thirty-eighth resistor and the thirty-ninth resistor, and the other end of the forty-first resistor being coupled to the output end of the low voltage conversion circuit;

[0076] A sixteenth capacitor, one end of the sixteenth capacitor is coupled to the detection positive output end, and the other end of the sixteenth capacitor is grounded;

[0077] a seventeenth capacitor, one end of the seventeenth capacitor being coupled to the thirty-eighth resistor, and the other end of the seventeenth capacitor being grounded;

[0078] a 42nd resistor, one end of the 42nd resistor being coupled to the detection negative output end, and the other end of the 42nd resistor being coupled to the other end of the 37th resistor via a 43rd resistor and a 44th resistor in sequence;

[0079] a 45th resistor, one end of the 45th resistor is coupled between the 42nd resistor and the 43rd resistor, and the other end of the 45th resistor is coupled to the output end of the low voltage conversion circuit;

[0080] An eighteenth capacitor, one end of the eighteenth capacitor is coupled to the detection negative output terminal, and the other end of the eighteenth capacitor is grounded;

[0081] A nineteenth capacitor, one end of the nineteenth capacitor is coupled to the forty-second resistor, and the other end of the nineteenth capacitor is grounded.

[0082] Optionally, the driving circuit includes:

[0083] a forty-sixth resistor, one end of which is coupled to the switch control end;

[0084] The first switch chip comprises: a first chip input terminal, a first chip power supply terminal, a first sub-output terminal and a second sub-output terminal;

[0085] The other end of the forty-sixth resistor is coupled to the first chip input end; the first chip power supply end is coupled to the output end of the high-voltage conversion circuit;

[0086] an eighth diode, an anode of the eighth diode being coupled to the driving end of the first switch unit through a forty-seventh resistor, and a cathode of the eighth diode being coupled to the first sub-output end and / or the second sub-output end;

[0087] a 48th resistor, one end of the 48th resistor is coupled to the cathode of the eighth diode, and the other end of the 48th resistor is coupled to the driving end of the first switch unit;

[0088] a twentieth capacitor, one end of the twentieth capacitor is coupled to the forty-sixth resistor, and the other end of the twentieth capacitor is grounded;

[0089] A twenty-first capacitor, one end of which is coupled to the first chip power supply end, and the other end of which is grounded;

[0090] The twenty-second capacitor is connected in parallel with the twenty-first capacitor.

[0091] Optionally, the high voltage conversion circuit includes:

[0092] The second switch chip comprises: a second chip input terminal, a second chip output terminal and a second chip ground terminal;

[0093] The output terminal of the input circuit is coupled to the second chip input terminal and / or grounded;

[0094] A second energy storage filter capacitor, coupled between the second chip output terminal and the second chip ground terminal;

[0095] a ninth diode, wherein an anode of the ninth diode is coupled to the power supply terminal of the main control chip, and a cathode of the ninth diode is coupled to the output terminal of the second chip;

[0096] a tenth diode, wherein an anode of the tenth diode is grounded, and a cathode of the tenth diode is coupled to a cathode of the second energy storage filter capacitor;

[0097] a third inductor coupled between the anode of the ninth diode and the cathode of the tenth diode;

[0098] a third energy storage filter capacitor, coupled between the anode of the ninth diode and the anode of the tenth diode;

[0099] A twenty-third capacitor, one end of which is coupled to the output end of the input circuit, and the other end of which is grounded;

[0100] A twenty-fourth capacitor, one end of which is coupled to the power supply end of the main control chip, and the other end of which is grounded;

[0101] A first light-emitting unit, one end of the first light-emitting unit is coupled to the output end of the high-voltage conversion circuit through a forty-ninth resistor, and the other end of the first light-emitting unit is grounded.

[0102] Optionally, the low voltage conversion circuit includes:

[0103] The third switch chip comprises: a third chip input terminal, a third chip output terminal and a third chip ground terminal;

[0104] The output terminal of the high voltage conversion circuit is coupled to the input terminal of the third chip through a 50th resistor; the ground terminal of the third chip is grounded;

[0105] a fifty-first resistor, connected in parallel with the fiftieth resistor;

[0106] a fourth energy storage filter capacitor, wherein a positive electrode of the fourth energy storage filter capacitor is coupled to the input terminal of the third chip, and a negative electrode of the fourth energy storage filter capacitor is grounded;

[0107] A twenty-fifth capacitor, connected in parallel with the fourth energy storage filter capacitor;

[0108] a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to the output end of the third chip, and a negative electrode of the fifth energy storage filter capacitor is grounded;

[0109] The twenty-sixth capacitor is connected in parallel with the fifth energy storage filter capacitor.

[0110] Optionally, the current detection terminal includes: a positive current detection terminal and a negative current detection terminal;

[0111] The current detection circuit comprises:

[0112] a fifty-second resistor, one end of the fifty-second resistor being coupled to the current positive detection end, and the other end of the fifty-second resistor being grounded via a fifty-third resistor and a fifty-fourth resistor in sequence;

[0113] a fifty-fifth resistor, one end of the fifty-fifth resistor being coupled between the fifty-second resistor and the fifty-third resistor, and the other end of the fifty-fifth resistor being coupled to the output end of the low voltage conversion circuit;

[0114] A twenty-seventh capacitor, one end of which is coupled to the current positive detection end, and the other end of which is grounded;

[0115] a twenty-eighth capacitor, one end of the twenty-eighth capacitor being coupled to the fifty-second resistor, and the other end of the twenty-eighth capacitor being grounded;

[0116] a fifty-sixth resistor, one end of the fifty-sixth resistor being coupled to the negative current detection end, and the other end of the fifty-sixth resistor being coupled to the second sub-output end via a fifty-seventh resistor and a fifty-eighth resistor in sequence;

[0117] a fifty-ninth resistor, one end of the fifty-ninth resistor being coupled between the fifty-sixth resistor and the fifty-seventh resistor, and the other end of the fifty-ninth resistor being coupled to the output end of the low voltage conversion circuit;

[0118] A twenty-ninth capacitor, one end of which is coupled to the negative current detection end, and the other end of which is grounded;

[0119] a 30th capacitor, one end of the 30th capacitor is coupled to the 56th resistor, and the other end of the 30th capacitor is grounded;

[0120] The thirty-first capacitor is coupled between the fifty-fourth resistor and the fifty-eighth resistor.

[0121] The beneficial effects of the present disclosure are as follows: the motor frequency conversion circuit is directly driven by the main control chip without the intervention of an additional drive chip, which significantly simplifies the circuit design, reduces the number of components, thereby reducing manufacturing costs and maintenance complexity, and improving the reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0122] Figure 1 A schematic diagram showing the circuit principle of an input circuit in an embodiment of the present disclosure is shown.

[0123] Figure 2 A schematic diagram showing the circuit principles of a main control chip and a reset circuit in an embodiment of the present disclosure is shown.

[0124] Figure 3 A schematic diagram showing the circuit principle of a motor drive frequency conversion circuit in an embodiment of the present disclosure is shown.

[0125] Figure 4 A schematic diagram showing the circuit principle of a motor current detection circuit in an embodiment of the present disclosure is shown.

[0126] Figure 5 A schematic diagram showing the circuit principle of a front-stage voltage detection circuit in an embodiment of the present disclosure is shown.

[0127] Figure 6 A schematic diagram showing the circuit principle of a post-stage voltage detection circuit in an embodiment of the present disclosure is shown.

[0128] Figure 7 A schematic diagram showing the circuit principle of a driving circuit in an embodiment of the present disclosure is shown.

[0129] Figure 8 A schematic diagram showing the circuit principle of a high voltage conversion circuit in an embodiment of the present disclosure is shown.

[0130] Fig. 9 A schematic diagram showing the circuit principle of a low voltage conversion circuit in an embodiment of the present disclosure is shown.

[0131] Fig.10 A circuit schematic diagram showing a current detection circuit in an embodiment of the present disclosure.

[0132] Fig.11A schematic diagram showing the circuit principle of a temperature detection circuit in an embodiment of the present disclosure is shown.

[0133] Fig.12 A circuit schematic diagram showing a display circuit in an embodiment of the present disclosure is shown.

[0134] Fig.13 A schematic diagram showing the circuit principle of a serial port input circuit in an embodiment of the present disclosure is shown.

[0135] Fig.14 A schematic diagram showing the circuit principle of a debugging circuit in an embodiment of the present disclosure is shown.

[0136] Fig.15 A schematic diagram showing the circuit principles of a first input circuit and a second input circuit in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0137] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0138] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0139] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0140] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0141] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0142] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0143] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0144] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0145] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0146] In related technologies, refrigerator compressor frequency conversion circuit design often uses complex links such as multi-level voltage, current detection and switch control, and often requires additional driver chips to intervene in the motor driving process, which not only increases the complexity of system components, but also increases manufacturing costs. The existence of redundant components makes the overall system maintenance and troubleshooting cumbersome.

[0147] A first aspect of the present disclosure provides a compressor inverter circuit, which includes: an input circuit, a main control chip and a low-voltage conversion circuit.

[0148] exist Figure 1 In the example, the input circuit shown includes a first switch unit Q1, which is coupled between an output terminal of the input circuit and a ground terminal;

[0149] exist Figure 2 In the example, the main control chip includes: a front-stage voltage detection terminal 1, a rear-stage voltage detection terminal 2, a current detection terminal 3, a switch control terminal 4, a main control chip power supply terminal 5, a motor three-phase output terminal 6 and a motor feedback terminal 7;

[0150] The front-stage voltage detection terminal 1 is coupled to the first sub-output terminal OUT1 between the input terminal and the output terminal of the input circuit through the front-stage voltage detection circuit;

[0151] The rear-stage voltage detection terminal 2 is coupled to the output terminal of the input circuit through a rear-stage voltage detection circuit;

[0152] The current detection terminal 3 is coupled to the second sub-output terminal OUT2 between the input terminal and the output terminal of the input circuit through a current detection circuit;

[0153] The switch control terminal 4 is coupled to the driving terminal of the first switch unit Q1 through a driving circuit; the main control chip controls the conduction of the first switch unit Q1 through the switch control terminal 4 according to the input signals of the front-stage voltage detection terminal 1 and the rear-stage voltage detection terminal 2, thereby controlling the output voltage of the input circuit; the output end of the input circuit is coupled to the power supply terminal 5 of the main control chip through a high-voltage conversion circuit;

[0154] The motor three-phase output terminal 6 is coupled to the inverter motor through the motor drive frequency conversion circuit; the motor feedback terminal 7 is coupled between the input terminal and the output terminal of the motor drive frequency conversion circuit; the main control chip adjusts the on-off of the motor drive frequency conversion circuit through the motor three-phase output terminal 6 according to the feedback signal of the motor feedback terminal 7, thereby adjusting the speed of the inverter motor;

[0155] The input end of the low voltage conversion circuit is coupled to the output end of the high voltage conversion circuit, and the output end of the low voltage conversion circuit outputs a working voltage.

[0156] Specifically, in some embodiments, the input unit is used to provide working power for other circuits in the compressor inverter circuit. By controlling the on and off of the first switch unit Q1, the output voltage and current of the input circuit can be controlled, and the harmonics of the circuit can be suppressed. The main control chip commands the on and off of the first switch unit Q1 through the switch control terminal 4 according to the input signals of the front-stage voltage detection terminal 1 and the rear-stage voltage detection terminal 2, thereby adjusting the output voltage of the input circuit in real time, so that the voltage output to the motor adapts to the current working state, such as the cooling demand of the refrigerator or the energy-saving mode. Under the control of the first switch unit Q1, the voltage waveform distortion at the power input terminal can be suppressed and the influence of harmonics can be reduced. Harmonic waveform distortion can cause current or voltage fluctuations, generate additional heat, and affect circuit efficiency and motor life. Through effective control, the harmonic waveform distortion at the input terminal is reduced, the purity of the circuit is improved, the current stability is ensured, and the motor and other electronic components are protected from high-frequency interference.

[0157] The output end of the input circuit is coupled to the main control chip power supply terminal 5 through the high-voltage conversion circuit, which optimizes the power conversion efficiency and reduces energy consumption. At the same time, the low-voltage conversion circuit ensures a stable working voltage output to meet the system power supply requirements. The main control chip can directly drive the motor drive frequency conversion circuit without adding an additional drive chip. The motor feedback terminal 7 enables the main control chip to adjust the on and off of the motor drive frequency conversion circuit according to the feedback signal, accurately control the motor speed, and improve the response speed and energy efficiency. In some embodiments, the model of the main control chip can be implemented by SPD1163 and its related series of chips with similar functions, or by main control chips from other manufacturers with similar principles.

[0158] Optional, in Figure 1 In the example, the input circuit further includes:

[0159] The three-phase input terminal includes a live line input terminal L, a neutral line input terminal N and a ground line input terminal G; the ground line input terminal G is grounded;

[0160] The common mode suppression inductor T comprises a first winding T1 and a second winding T2; the live line input terminal L is coupled to one end of the first winding T1 via a fuse F1 and a magnetic ring M1 in sequence; the neutral line input terminal N is coupled to one end of the second winding T2 via the magnetic ring M1; the other ends of the first winding T1 and the second winding T2 are coupled to the output end of the input circuit via a rectifier bridge;

[0161] An adjustable resistor RV1, coupled between one end of the first winding T1 and one end of the second winding T2;

[0162] A first capacitor C1 is connected in parallel with the adjustable resistor RV1;

[0163] A first resistor string is connected in parallel with the first capacitor C1, the first resistor string includes a first resistor R1, a second resistor R3R2 and a second resistor R3 connected in sequence;

[0164] a second capacitor C2, one end of the second capacitor C2 is coupled to the other end of the first winding T1, and the other end of the second capacitor C2 is coupled to the other end of the second winding T2 via a third capacitor C3 and a fourth resistor R4 in sequence;

[0165] a fourth capacitor C4, one end of the fourth capacitor C4 is coupled to the first input end of the rectifier bridge, and the other end of the fourth capacitor C4 is coupled to the second input end of the rectifier bridge via the first inductor L1;

[0166] A second inductor L2 is coupled between the output end of the rectifier bridge and the output end of the input circuit;

[0167] The first sub-output terminal OUT1 is arranged between the output terminal of the rectifier bridge and the second inductor L2;

[0168] a first diode D1, wherein an anode of the first diode D1 is coupled to the second inductor L2, and a cathode of the first diode D1 is coupled to an output end of the input circuit;

[0169] a fifth resistor R5, one end of which is coupled to the second sub-output terminal OUT2, and the other end of which is coupled to the driving end of the first switch unit Q1 through a sixth resistor R6; a first end of the first switch unit Q1 is coupled to the second inductor L2, and a second end of the first switch unit Q1 is coupled to ground; and the sixth resistor R6 is grounded;

[0170] The connection point between the fifth resistor R5 and the fourth capacitor C4 is the second sub-output terminal OUT2;

[0171] a fifth capacitor C5, one end of the fifth capacitor C5 being coupled to a connection point between the second capacitor C2 and the third capacitor C3, and the other end of the fifth capacitor C5 being coupled to a third input end of the rectifier bridge;

[0172] A connection point between the second capacitor C2 and the third capacitor C3 is grounded;

[0173] a sixth capacitor C6, wherein the sixth capacitor C6 is connected in parallel with the sixth resistor R6;

[0174] A seventh capacitor C7 and a first energy storage filter capacitor EC1 are connected in parallel between the output terminal of the input circuit and the ground terminal; one end of the seventh capacitor C7 is coupled to the first diode D1.

[0175] Specifically, in some embodiments, Figure 1 In the example, the input circuit configuration includes live wire, neutral wire and ground wire input terminal G, where the ground wire is directly grounded to ensure circuit safety and stability. The live wire input terminal L is coupled to one end of the first winding T1 through the fuse F1 and the ring magnetic coupling, and the neutral wire input terminal N is coupled to the second winding T2. The two groups are respectively connected to the output end of the input circuit through a rectifier bridge to form a choke to suppress common-mode interference.

[0176] The adjustable resistor RV1 is used to adjust the current and suppress the surge voltage. It is connected in parallel with the first capacitor C1 to further suppress high-frequency noise. The first capacitor C1 is used to suppress differential mode interference. At the same time, the first resistor R1 string (first resistor R1, second resistor, third resistor) is connected in parallel to further refine the filtering control. The second capacitor C2 and the third capacitor C3 are used to suppress high-frequency noise interference. These noises usually come from grid fluctuations, switching operations, or harmonic waveform distortion generated during the high-frequency conversion process inside the circuit. They may affect the stability and signal quality of the circuit. The second capacitor C2 and the third capacitor C3 form a low impedance (high-frequency impedance path), which effectively absorbs and filters out high-frequency interference, improves the purity of the signal and the overall operating efficiency of the system. The fourth capacitor C4 is used for filtering and suppressing differential mode interference. Differential mode interference is usually caused by unbalanced voltage between the power line and the ground line, or by external electromagnetic field coupling into the circuit. This type of interference has a significant impact on the stability and performance of the circuit. The fourth capacitor C4 establishes a low impedance path between the power line and the ground, effectively bypassing the differential mode interference, ensuring the stable output voltage quality of the power supply, and reducing the impact on the entire system.

[0177] The first switch unit Q1 controls the on and off of the current in the second inductor L2, and realizes dynamic regulation of the current through fast response and precise switching action, thereby adjusting the speed and power output of the inverter motor in real time. The second diode D2 is used for unidirectional conduction, allowing current to flow only in a specific direction. When the voltage in the circuit rises instantly, it can be quickly turned on to guide the overvoltage energy to a predetermined path for release, protecting the subsequent circuit from damage.

[0178] The current detection circuit obtains the output current value of the input circuit by detecting the voltage difference across the fifth resistor R5, and feeds back to the main control chip through the current detection terminal 3. The main control chip controls the conduction of the input circuit by controlling the feedback terminal of the first switch unit Q1. The sixth resistor R6 and the sixth capacitor C6 are connected in parallel and work together to limit the current and stabilize the signal during filtering. The seventh capacitor C7 is used for filtering. The first switch unit Q1 can select MOSFET or transistor, or other switch elements according to actual needs.

[0179] Optional, in Figure 5 In the example, the front-stage voltage detection circuit includes:

[0180] a seventh resistor R7, one end of the seventh resistor R7 is coupled to the first sub-output end OUT1, and the other end of the seventh resistor R7 is grounded via an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11 in sequence;

[0181] a twelfth resistor R12, one end of the twelfth resistor R12 is coupled to a connection point between the tenth resistor R10 and the eleventh resistor R11, and the other end of the twelfth resistor R12 is coupled to the front-stage voltage detection terminal 1;

[0182] The eighth capacitor C8 is connected in parallel with the eleventh resistor R11.

[0183] Specifically, in some embodiments, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 together form a voltage divider network for preliminary voltage signal extraction and attenuation voltage processing. The front-stage voltage detection terminal 1 is connected to the connection point between the tenth resistor R10 and the eleventh resistor R11 through the seventeenth resistor R17 to obtain the sampled voltage at the output end of the rectifier bridge; the eighth capacitor C8 and the eleventh resistor R11 form an RC filter network.

[0184] Optional, in Figure 6 In the example, the post-stage voltage detection circuit includes:

[0185] A thirteenth resistor R13, one end of the thirteenth resistor R13 is coupled to the output end of the input circuit, and the other end of the thirteenth resistor R13 is grounded via a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16 in sequence;

[0186] A seventeenth resistor R17, one end of the seventeenth resistor R17 is coupled to the connection point between the fifteenth resistor R15 and the sixteenth resistor R16, and the other end of the seventeenth resistor R17 is coupled to the rear-stage voltage detection terminal 2;

[0187] A ninth capacitor C9, wherein the ninth capacitor C9 is connected in parallel with the sixteenth resistor R16.

[0188] Specifically, in some embodiments, the main control chip obtains the output voltage of the input circuit according to the voltage difference between the front-stage voltage detection terminal 1 and the rear-stage voltage detection terminal 2, thereby controlling the first switch unit Q1 to adjust the output voltage. The thirteenth resistor R13 is connected to the ground through the fourteenth resistor R14, the fifteenth resistor R15 and the sixteenth resistor R16 to form a voltage-dividing network; one end of the seventeenth resistor R17 is connected to the connection point between the fifteenth resistor R15 and the sixteenth resistor R16, that is, the voltage-dividing point, and is transmitted to the rear-stage voltage detection terminal 2 to obtain the voltage at the output end of the input circuit.

[0189] Optional, in Figure 2 In the example, the motor three-phase output terminal 6 includes: a first phase output terminal 610, a second phase output terminal 620, a third phase output terminal 630, a first upper driving terminal 611, a first lower driving terminal 612, a second upper driving terminal 621, a second lower driving terminal 622, a third upper driving terminal 631 and a third lower driving terminal 632;

[0190] The three-phase power supply circuit of the inverter motor is respectively coupled to the first phase output terminal 610, the second phase output terminal 620 and the third phase output terminal 630;

[0191] exist Figure 3 In the example, the motor drive frequency conversion circuit includes: a first phase control circuit, a second phase control circuit and a third phase control circuit;

[0192] For example, in Figure 3 In the embodiment, the first phase control circuit comprises:

[0193] A second switch unit Q2, wherein a first terminal of the second switch unit Q2 is coupled to the output terminal of the input circuit, and a second terminal of the second switch unit Q2 is coupled to the first phase output terminal 610;

[0194] a second diode D2, wherein an anode of the second diode D2 is coupled to the control end of the second switch unit Q2 via a nineteenth resistor R19, and a cathode of the second diode D2 is coupled to the first upper driving end 611;

[0195] a twentieth resistor R20, one end of the twentieth resistor R20 is coupled to the first upper driving end 611, the other end of the twentieth resistor R20 is coupled to the first phase output end 610 via a twenty-first resistor R21; a connection point between the twentieth resistor R20 and the twenty-first resistor R21 is coupled to the control end of the second switch unit Q2;

[0196] a tenth capacitor C10, coupled between the control terminal and the second terminal of the second switch unit Q2, and connected in parallel with the twenty-first resistor R21;

[0197] A third switch unit Q3, wherein a first end of the third switch unit Q3 is coupled to a second end of the second switch unit Q2, and a second end of the third switch unit Q3 is coupled to the motor feedback end 7;

[0198] a third diode D3, wherein an anode of the third diode D3 is coupled to the control end of the third switch unit Q3 via a twenty-second resistor R22, and a cathode of the third diode D3 is coupled to the first lower driving end 612;

[0199] A twenty-third resistor R23, one end of the twenty-third resistor R23 is coupled to the first lower driving end 612, and the other end of the twenty-third resistor R23 is coupled to the second end of the third switch unit Q3 through a twenty-fourth resistor R24;

[0200] an eleventh capacitor C11, coupled between the control terminal and the second terminal of the third switch unit Q3, and connected in parallel with the twenty-fourth resistor R24;

[0201] For example, in Figure 3 In the embodiment, the second phase control circuit comprises:

[0202] a fourth switch unit Q4, wherein a first terminal of the fourth switch unit Q4 is coupled to the output terminal of the input circuit, and a second terminal of the fourth switch unit Q4 is coupled to the second phase output terminal 620;

[0203] a fourth diode D4, wherein an anode of the fourth diode D4 is coupled to the control end of the fourth switch unit Q4 via a twenty-fifth resistor R25, and a cathode of the fourth diode D4 is coupled to the second upper driving end 621;

[0204] A twenty-sixth resistor R26, one end of the twenty-sixth resistor R26 is coupled to the second upper driving end 621, and the other end of the twenty-sixth resistor R26 is coupled to the second phase output end 620 via a twenty-seventh resistor R27; a connection point between the twenty-sixth resistor R26 and the twenty-seventh resistor R27 is coupled to the control end of the fourth switch unit Q4;

[0205] a twelfth capacitor C12, coupled between the control terminal and the second terminal of the fourth switch unit Q4, and connected in parallel with the twenty-seventh resistor R27;

[0206] a fifth switch unit Q5, wherein a first end of the fifth switch unit Q5 is coupled to a second end of the fourth switch unit Q4, and a second end of the fifth switch unit Q5 is coupled to the motor feedback end 7;

[0207] a fifth diode D5, wherein an anode of the fifth diode D5 is coupled to the control end of the fifth switch unit Q5 via a twenty-eighth resistor R28, and a cathode of the fifth diode D5 is coupled to the second lower driving end 622;

[0208] A twenty-ninth resistor R29, one end of the twenty-ninth resistor R29 is coupled to the second lower driving end 622, and the other end of the twenty-ninth resistor R29 is coupled to the second end of the fifth switch unit Q5 through a thirtieth resistor R30;

[0209] A thirteenth capacitor C13 is coupled between the control terminal and the second terminal of the fifth switch unit Q5 and is connected in parallel with the thirtieth resistor R30;

[0210] and / or, in Figure 3 In the example, the third phase control circuit includes:

[0211] a sixth switch unit Q6, wherein a first terminal of the sixth switch unit Q6 is coupled to the output terminal of the input circuit, and a second terminal of the sixth switch unit Q6 is coupled to the third phase output terminal 630;

[0212] a sixth diode D6, wherein an anode of the sixth diode D6 is coupled to the control end of the sixth switch unit Q6 via a thirty-first resistor R31, and a cathode of the sixth diode D6 is coupled to the third upper driving end 631;

[0213] A thirty-second resistor R32, one end of the thirty-second resistor R32 is coupled to the third upper driving end 631, and the other end of the thirty-second resistor R32 is coupled to the third phase output end 630 via a thirty-third resistor R33; a connection point between the thirty-second resistor R32 and the thirty-third resistor R33 is coupled to the control end of the sixth switch unit Q6;

[0214] A fourteenth capacitor C14 is coupled between the control terminal and the second terminal of the sixth switch unit Q6 and is connected in parallel with the thirty-third resistor R33;

[0215] a seventh switch unit Q7, wherein a first end of the seventh switch unit Q7 is coupled to a second end of the sixth switch unit Q6, and a second end of the seventh switch unit Q7 is coupled to the motor feedback end 7;

[0216] a seventh diode D7, wherein an anode of the seventh diode D7 is coupled to the control terminal of the seventh switch unit Q7 via a thirty-fourth resistor R34, and a cathode of the seventh diode D7 is coupled to the third lower driving terminal 632;

[0217] A thirty-fifth resistor R35, one end of the thirty-fifth resistor R35 is coupled to the third lower driving end 632, and the other end of the thirty-fifth resistor R35 is coupled to the second end of the seventh switch unit Q7 via a thirty-sixth resistor R36;

[0218] The fifteenth capacitor C15 is coupled between the control terminal and the second terminal of the seventh switch unit Q7 , and is connected in parallel with the thirty-sixth resistor R36 .

[0219] Specifically, in some embodiments, an independent control circuit (a first phase control circuit, a second phase control circuit, and a third phase control circuit) is designed for each phase of the inverter motor to control the three-phase power supply lines of the inverter motor respectively, and the switch unit in the control circuit of each phase is used to control the phase output of the motor; the control end of the switch unit of each phase is controlled by the upper drive end and the lower drive end of each phase, thereby controlling the conduction of the switch unit.

[0220] Taking the first phase control circuit as an example, the first end and the second end of the second switch unit Q2 are connected through the output end of the input circuit and the first phase output end 610 of the main control chip; the control end of the second switch unit Q2 is connected to the first upper driving end 611 through the nineteenth resistor R19 and the second diode D2 to form a voltage-controlled switch path, and the main control chip controls the conduction of the second switch unit Q2 through the first upper driving end 611. One end of the twentieth resistor R20 is connected to the first upper driving end 611, and the other end is connected to the first phase output end 610 through the twenty-first resistor R21 to form a voltage distribution and current adjustment mechanism. The tenth capacitor C10 is connected in parallel with the twenty-first resistor R21 to filter out high-frequency noise, optimize signal quality, and improve control accuracy.

[0221] The third switch unit Q3 is connected to the second end of the second switch unit Q2, and the third end is connected to the motor feedback end 7 to implement closed-loop control, and the conduction condition of the first phase in the motor drive frequency conversion circuit is fed back to the main control chip, and the main control chip controls the conduction of the corresponding phase according to the feedback signal of the corresponding phase. The conduction logic of the third switch unit Q3 is consistent with that of the second switch unit Q2, and no further details are given here.

[0222] The circuit logic of the second phase control circuit and the third phase control circuit is the same as that of the first phase control circuit. Please refer to the control logic of the first phase control circuit and no further details will be given here.

[0223] A 42nd capacitor C42 is provided between the first phase output terminal 610 and the first lower driving terminal 612; a 41st capacitor C41 of the second lower driving terminal is provided between the second phase output terminals 620 and 622; a 40th capacitor C40 is provided between the third phase output terminal 630 and the third lower driving terminal 632;

[0224] Optional, in Figure 2 In the example, the main control chip further includes a motor current detection output terminal 8, including: a detection positive output terminal 81 and a detection negative output terminal 82; the motor feedback terminal 7 is grounded through a thirty-seventh resistor R37;

[0225] The motor current detection output terminal 8 is coupled to both ends of the thirty-seventh resistor R37 through a motor current detection circuit;

[0226] exist Figure 4In the example, the motor current detection circuit includes:

[0227] A thirty-eighth resistor R38, one end of the thirty-eighth resistor R38 is coupled to the detection positive output terminal 81, and the other end of the thirty-eighth resistor R38 is coupled to one end of the thirty-seventh resistor R37 via a thirty-ninth resistor R39 and a fortieth resistor R40 in sequence;

[0228] a forty-first resistor R41, one end of the forty-first resistor R41 is coupled between the thirty-eighth resistor R38 and the thirty-ninth resistor R39, and the other end of the forty-first resistor R41 is coupled to the output end of the low voltage conversion circuit;

[0229] A sixteenth capacitor C16, one end of the sixteenth capacitor C16 is coupled to the detection positive output terminal 81, and the other end of the sixteenth capacitor C16 is grounded;

[0230] a seventeenth capacitor C17, one end of the seventeenth capacitor C17 is coupled to the thirty-eighth resistor R38, and the other end of the seventeenth capacitor C17 is grounded;

[0231] a forty-second resistor R42, one end of the forty-second resistor R42 is coupled to the detection negative output terminal 82, and the other end of the forty-second resistor R42 is coupled to the other end of the thirty-seventh resistor R37 via a forty-third resistor R43 and a forty-fourth resistor R44 in sequence;

[0232] a forty-fifth resistor R45, one end of the forty-fifth resistor R45 is coupled between the forty-second resistor R42 and the forty-third resistor R43, and the other end of the forty-fifth resistor R45 is coupled to the output end of the low voltage conversion circuit;

[0233] An eighteenth capacitor C18, one end of the eighteenth capacitor C18 is coupled to the detection negative output terminal 82, and the other end of the eighteenth capacitor C18 is grounded;

[0234] A nineteenth capacitor C19 has one end coupled to the forty-second resistor R42 , and the other end of the nineteenth capacitor C19 is grounded.

[0235] Specifically, in some embodiments, the motor current detection terminal 3 is connected to the thirty-seventh resistor R37 through the motor current detection circuit, and the output current of the motor current detection circuit is detected by the voltage difference on both sides of the thirty-seventh resistor R37; the thirty-eighth resistor R38 forms a voltage divider network with the thirty-ninth resistor R39 and the fortieth resistor R40, and obtains the voltage at one end of the thirty-seventh resistor R37. The forty-first resistor R41 is used for voltage division to prevent overload and protect the subsequent components such as the main control chip from being damaged by excessive current. The sixteenth capacitor C16 is used to filter out high-frequency noise. The seventeenth capacitor C17 is used for further filtering. The forty-second resistor R42 forms a voltage divider network with the forty-third resistor R43 and the forty-fourth resistor R44, and obtains the voltage value at the other end of the thirty-seventh resistor R37. The function of the forty-fifth resistor R45 is the same as that of the forty-first resistor R41. The functions of the eighteenth capacitor C18 and the nineteenth capacitor C19 are the same as those of the sixteenth capacitor C16 and the seventeenth capacitor C17.

[0236] Optional, in Figure 7 In an example, the driving circuit includes:

[0237] a forty-sixth resistor R46, one end of the forty-sixth resistor R46 is coupled to the switch control terminal 4;

[0238] The first switch chip comprises: a first chip input terminal IN1, a first chip power supply terminal VCC1, a first sub-output terminal OUT1 and a second sub-output terminal OUT2;

[0239] The other end of the forty-sixth resistor R46 is coupled to the first chip input terminal IN1; the first chip power supply terminal VCC1 is coupled to the output end of the high-voltage conversion circuit;

[0240] an eighth diode D8, an anode of the eighth diode D8 being coupled to the driving end of the first switch unit Q1 via a forty-seventh resistor R47, and a cathode of the eighth diode D8 being coupled to the first sub-output end OUT1 and / or the second sub-output end OUT2;

[0241] a forty-eighth resistor R48, one end of the forty-eighth resistor R48 is coupled to the cathode of the eighth diode D8, and the other end of the forty-eighth resistor R48 is coupled to the driving end of the first switch unit Q1;

[0242] a twentieth capacitor C20, one end of the twentieth capacitor C20 is coupled to the forty-sixth resistor R46, and the other end of the twentieth capacitor C20 is grounded;

[0243] A twenty-first capacitor C21, one end of the twenty-first capacitor C21 is coupled to the first chip power supply terminal VCC1, and the other end of the twenty-first capacitor C21 is grounded;

[0244] The twenty-second capacitor C22 is connected in parallel with the twenty-first capacitor C21.

[0245] Specifically, in some embodiments, the control signal is generated by the main control chip and transmitted to the first chip input terminal IN1 through the forty-sixth resistor R46. When the first switch chip receives the control signal, it outputs sufficient driving voltage according to the built-in logic processing, and turns on or off the driving end of the first switch unit Q1 through the forty-eighth resistor R48. The forty-eighth resistor R48 is used to adjust the signal strength or protection function to ensure that the signal correctly reaches the driving end of the first switch unit Q1 and triggers the switch to turn on. The eighth diode D8 is used for unidirectional conduction.

[0246] Optional, in Figure 8 In the example, the high voltage conversion circuit includes:

[0247] The second switch chip comprises: a second chip input terminal IN2, a second chip output terminal OUT3 and a second chip ground terminal GND1;

[0248] The output terminal of the input circuit is coupled to the second chip input terminal IN2 and / or grounded;

[0249] A second energy storage filter capacitor EC2, coupled between the second chip output terminal OUT3 and the second chip ground terminal GND1;

[0250] a ninth diode D9, wherein an anode of the ninth diode D9 is coupled to the power supply terminal 5 of the main control chip, and a cathode of the ninth diode D9 is coupled to the output terminal OUT3 of the second chip;

[0251] a tenth diode D10, wherein an anode of the tenth diode D10 is grounded, and a cathode of the tenth diode D10 is coupled to a cathode of the second energy storage filter capacitor EC2;

[0252] a third inductor L3, coupled between the anode of the ninth diode D9 and the cathode of the tenth diode D10;

[0253] A third energy storage filter capacitor EC3 is coupled between the anode of the ninth diode D9 and the anode of the tenth diode D10;

[0254] A twenty-third capacitor C23, one end of the twenty-third capacitor C23 is coupled to the output end of the input circuit, and the other end of the twenty-third capacitor C23 is grounded;

[0255] A twenty-fourth capacitor C24, one end of the twenty-fourth capacitor C24 is coupled to the main control chip power supply terminal 5, and the other end of the twenty-fourth capacitor C24 is grounded;

[0256] A first light-emitting unit, one end of the first light-emitting unit is coupled to the output end of the high-voltage conversion circuit through a forty-ninth resistor R49, and the other end of the first light-emitting unit is grounded.

[0257] Specifically, in some embodiments, the high-voltage conversion unit is used to convert the output voltage of the input circuit into a high-voltage output. As an example, the output voltage of the high-voltage conversion unit can be 15V; the second energy storage capacitor is used for energy storage and filtering, smoothing the output voltage, ensuring the current is stable, reducing fluctuations, and improving the quality of the power supply. The ninth diode D9 ensures that the current flows in one direction, protects the circuit from reverse current damage, and controls the voltage conversion process. The tenth diode D10 forms a voltage control release path, and realizes secondary regulation and protection of the voltage through diode control. The third inductor L3 is coupled between the positive pole of the ninth diode D9 and the negative pole of the tenth diode D10 to smooth the current, stabilize the voltage, prevent high-frequency oscillation, reduce ripple, and enhance output smoothness. The third energy storage filter capacitor EC3 is used for further filtering and energy storage to ensure the purity and stability of the output voltage. The twenty-fourth capacitor C24 is connected to the power supply terminal 5 of the main control chip and the ground, stabilizes the power supply, is connected in parallel with the first light-emitting unit, displays the working status, and intuitively indicates whether the circuit is activated, which is convenient for fault judgment and maintenance.

[0258] Optional, in Fig. 9 In an example, the low voltage conversion circuit includes:

[0259] The third switch chip comprises: a third chip input terminal IN3, a third chip output terminal OUT3 and a third chip ground terminal OUT4;

[0260] The output end of the high voltage conversion circuit is coupled to the third chip input end IN3 through the 50th resistor R50; the third chip ground end OUT4 is grounded;

[0261] a fifty-first resistor R51 connected in parallel with the fiftieth resistor R50;

[0262] A fourth energy storage filter capacitor EC4, wherein a positive electrode of the fourth energy storage filter capacitor EC4 is coupled to the third chip input terminal IN3, and a negative electrode of the fourth energy storage filter capacitor EC4 is grounded;

[0263] A twenty-fifth capacitor C25 is connected in parallel with the fourth energy storage filter capacitor EC4;

[0264] A fifth energy storage filter capacitor EC5, wherein a positive electrode of the fifth energy storage filter capacitor EC5 is coupled to the third chip output terminal OUT3, and a negative electrode of the fifth energy storage filter capacitor EC5 is grounded;

[0265] The twenty-sixth capacitor C26 is connected in parallel with the fifth energy storage filter capacitor EC5.

[0266] Specifically, in some embodiments, the low-voltage conversion circuit is used to reduce the voltage after high-voltage conversion to the required low voltage, and provide a suitable power supply with stable electrical energy efficiency for subsequent circuits. As an example, the voltage output by the low-voltage conversion circuit can be 3.3V; the output end of the high-voltage conversion circuit is connected to the input end of the third chip through the 50th resistor R50, and the 50th resistor R50 plays a role in current limiting and voltage reduction to ensure that the input voltage is adapted to the processing of the third chip. The 51st resistor R51 is connected in parallel with it to further optimize the input voltage adjustment and current stability. The fourth energy storage filter capacitor EC4 is connected in parallel with the 25th capacitor C25 to form a filter circuit, remove high-frequency noise in the input voltage, smooth the input signal, improve the voltage quality, and protect the subsequent circuit. The fifth energy storage filter capacitor EC5 is connected in parallel with the 26th capacitor C26, and also filters the output voltage to ensure that the output voltage is smooth, remove high-frequency interference, improve the power quality, and meet the power supply requirements of the circuit.

[0267] Optional, in Fig.10 In the example, the current detection terminal 3 includes: a current positive detection terminal 31 and a current negative detection terminal 32;

[0268] The current detection circuit comprises:

[0269] a fifty-second resistor R52, one end of the fifty-second resistor R52 is coupled to the current positive detection terminal 31, and the other end of the fifty-second resistor R52 is grounded via a fifty-third resistor R53 and a fifty-fourth resistor R54 in sequence;

[0270] a fifty-fifth resistor R55, one end of the fifty-fifth resistor R55 is coupled between the fifty-second resistor R52 and the fifty-third resistor R53, and the other end of the fifty-fifth resistor R55 is coupled to the output end of the low voltage conversion circuit;

[0271] A twenty-seventh capacitor C27, one end of the twenty-seventh capacitor C27 is coupled to the current positive detection end 31, and the other end of the twenty-seventh capacitor C27 is grounded;

[0272] A twenty-eighth capacitor C28, one end of the twenty-eighth capacitor C28 is coupled to the fifty-second resistor R52, and the other end of the twenty-eighth capacitor C28 is grounded;

[0273] a fifty-sixth resistor R56, one end of the fifty-sixth resistor R56 is coupled to the negative current detection terminal 32, and the other end of the fifty-sixth resistor R56 is coupled to the second sub-output terminal OUT2 via a fifty-seventh resistor R57 and a fifty-eighth resistor R58 in sequence;

[0274] a fifty-ninth resistor R59, one end of the fifty-ninth resistor R59 is coupled between the fifty-sixth resistor R56 and the fifty-seventh resistor R57, and the other end of the fifty-ninth resistor R59 is coupled to the output end of the low voltage conversion circuit;

[0275] A twenty-ninth capacitor C29, one end of the twenty-ninth capacitor C29 is coupled to the negative current detection terminal 32, and the other end of the twenty-ninth capacitor C29 is grounded;

[0276] a 30th capacitor C30, one end of the 30th capacitor C30 is coupled to the 56th resistor R56, and the other end of the 30th capacitor C30 is grounded;

[0277] The thirty-first capacitor C31 is coupled between the fifty-fourth resistor R54 and the fifty-eighth resistor R58.

[0278] Specifically, in some embodiments, the current detection circuit obtains the output current of the input circuit by detecting the voltage difference between two points of the fifth resistor R5, and outputs it to the main control chip through the current positive detection terminal 31 and the current negative detection terminal 32;

[0279] One end of the fifth resistor R5 is grounded, and is coupled to the current positive detection terminal 31 of the main control chip after voltage division through the fifty-fourth resistor R54, the fifty-third resistor R53 and the fifty-second resistor R52 in sequence. The resistance of the fifth resistor R5 is 0.1K, and the output current of the input circuit passes through one end of the grounding end of the fifth resistor R5 to the other end of the fifth resistor R5, and is coupled to the current negative detection terminal 32 of the main control chip after voltage division through the second sub-output terminal OUT2 through the fifty-eighth resistor R58, the fifty-seventh resistor R57 and the fifty-sixth resistor R56; wherein, the twenty-seventh capacitor C27, the twenty-eighth capacitor C28, the twenty-ninth capacitor C29, the thirtieth capacitor C30 and the thirty-first capacitor C31 are used for filtering.

[0280] The current detection circuit is powered by the output voltage of the low-voltage conversion circuit. The voltage divider of the fifty-fifth resistor R55 and the fifty-ninth resistor R59 is used to divide the output voltage of the low-voltage conversion circuit, compensate the signal collected at both ends of the fifth resistor R5, and raise the collected voltage value to prevent the voltage value from being too small to be difficult to collect.

[0281] Optional, in Figure 2 In the example, in some embodiments, the main control chip also includes: a temperature detection terminal 9, a serial port input terminal 10, a serial port output terminal 11, a serial port frequency detection terminal 12, a host computer first input terminal 131, a host computer second input terminal 133, a reset terminal 132, a display terminal 14, a debugging terminal 15, an analog power supply terminal AVDD, a digital power supply terminal DVDD, an analog ground terminal AVSS, a digital ground terminal DVSS and a voltage stabilization terminal VCAP.

[0282] The temperature detection terminal 9 is coupled to a temperature detection circuit; the serial port input terminal 10 is coupled to the input terminal of a serial port input circuit; the serial port output terminal 11 and the serial port frequency detection terminal 12 are respectively coupled to the first output terminal and the second output terminal of the serial port input circuit; the host computer first input terminal 131 is coupled to the first input circuit; the host computer second input terminal 133 is coupled to the second input circuit; the reset terminal 132 is coupled to the reset circuit; the display terminal 14 is coupled to the display circuit; and the debug terminal 15 is coupled to the debug circuit.

[0283] Optional, in Fig.11 In an example, the temperature detection circuit includes:

[0284] a sixtieth resistor R60, one end of which is coupled to the temperature detection end 9;

[0285] a sixty-first resistor R61, one end of the sixty-first resistor R61 is coupled to the output end of the low voltage conversion circuit, and the other end of the sixty-first resistor R61 is grounded via a thermistor;

[0286] The other end of the sixtieth resistor R60 is coupled to a connection point between the sixtieth resistor R60 and the thermistor;

[0287] A thirty-second capacitor C32 has one end coupled to one end of the sixtieth resistor R60, and the other end of the thirty-second resistor R32 is grounded.

[0288] Specifically, in some embodiments, the temperature test circuit is used to detect the ambient temperature of the main control chip and feed it back to the main control chip. The temperature sensor network composed of the sixtieth resistor R60, the sixty-first resistor R61 and the thermistor is coupled to the temperature detection terminal 9 of the main control chip through the sixtieth resistor R60 to realize the conversion of the temperature signal. The thirty-second capacitor C32 is used for filtering to improve the signal purity.

[0289] Optional, in Fig.13 In the example, the serial port input circuit includes:

[0290] a sixty-second resistor R62, one end of the sixty-second resistor R62 is coupled to the serial port input terminal 10, and the other end of the sixty-second resistor R62 is grounded via a sixty-third resistor R63;

[0291] a first transistor Q8, wherein a base of the first transistor Q8 is coupled to the other end of the sixty-second resistor R62, and an emitter of the first transistor Q8 is grounded;

[0292] A first optical coupling component O1, comprising a first transmitting terminal O12 and a first receiving terminal O11, wherein one end of the first transmitting terminal O12 is coupled to the output end of the low voltage conversion circuit through a sixty-fourth resistor R64, and the other end of the first transmitting terminal O12 is coupled to the collector of the first transistor Q8;

[0293] A fourth switch chip, wherein the first receiving end O11 is coupled to an input end of the fourth switch chip;

[0294] The second optical coupling component O2 comprises a second transmitting terminal O21 and a second receiving terminal O22, wherein the output terminal of the fourth switch chip is coupled to one end of the second transmitting terminal O21 through a sixty-fifth resistor R65, and the other end of the second transmitting terminal O21 is coupled to the fourth switch chip;

[0295] a fourteenth diode D14, an anode of the fourteenth diode D14 coupled to the other end of the second emitting terminal O21, and a cathode of the fourteenth diode D14 coupled to the sixty-fifth resistor R65;

[0296] a thirteenth diode D13, wherein an anode of the thirteenth diode D13 is coupled to the neutral line input terminal N, and a cathode of the thirteenth diode D13 is coupled to a cathode of the fourteenth diode D14 via a sixty-sixth resistor R66;

[0297] A thirty-third capacitor C33 is connected in parallel with the fourteenth diode D14;

[0298] One end of the second receiving terminal O22 is grounded, and the other end of the second receiving terminal O22 is coupled to the serial port frequency detection terminal 12 via a sixty-seventh resistor R67;

[0299] a sixty-eighth resistor R68, one end of the sixty-eighth resistor R68 is coupled to the output end of the low voltage conversion circuit, and the other end of the sixty-eighth resistor R68 is coupled to the serial port output end 11 through a sixty-ninth resistor R69; one end of the sixty-seventh resistor R67 is coupled to the connection point between the sixty-eighth resistor R68 and the sixty-ninth resistor R69;

[0300] A thirty-fourth capacitor C34, one end of the thirty-fourth capacitor C34 is coupled to the serial port frequency detection terminal 12, and the other end of the thirty-fourth capacitor C34 is grounded;

[0301] A thirty-fifth capacitor C35, one end of the thirty-fifth capacitor C35 is coupled to the serial port output terminal 11, and the other end of the thirty-fifth capacitor C35 is grounded.

[0302] Specifically, the serial port input circuit is used to input serial port information to the main control chip and feed back the circuit status of the compressor inverter circuit to the outside world.

[0303] Optional, in Fig.15 In an example, the first input circuit includes:

[0304] A first short-circuit P1, one end of the first short-circuit P1 is coupled to the output end of the low-voltage conversion circuit, and the other end of the first short-circuit P1 is coupled to the first input end 131 of the host computer through the seventieth resistor R70 through the first double-row pin and / or is grounded through the seventy-first resistor R71.

[0305] Optional, in Fig.15 In an example, the second input circuit includes:

[0306] A second short-circuit P2, one end of the second short-circuit P2 is coupled to the output end of the low-voltage conversion circuit through a seventy-third resistor R73 and / or is coupled to the second input end 133 of the host computer through a seventy-second resistor R72 through a first double-row pin, and the other end of the second short-circuit P2 is grounded;

[0307] A thirty-sixth capacitor C36 is coupled between the second input terminal 133 of the host computer and the ground terminal;

[0308] The power supply end of the first double-row pin is coupled to the output end of the low voltage conversion circuit, and the ground end of the first double-row pin is grounded; a thirty-seventh capacitor C17 is coupled between the power supply end and the ground end of the first double-row pin.

[0309] Specifically, the first input circuit and the second input circuit both transmit host computer programming information to the main control chip through the first double-row pins so that the main control chip meets the usage requirements. Both the first input circuit and the second input circuit can transmit host computer programming information to the main control chip, which can be selected according to the specific situation.

[0310] Optional, in Figure 2 In an example, the reset circuit includes:

[0311] a seventy-fifth resistor R75, one end of the seventy-fifth resistor R75 is coupled to the reset end 132, and the other end of the seventy-fifth resistor R75 is coupled to one end of the first double-row pin;

[0312] A reset element, one end of which is coupled to the reset end 132, and a second end of which is grounded;

[0313] The seventy-fourth resistor R74, one end of the seventy-fourth resistor R74 is coupled to the output end of the low voltage conversion circuit, and the other end of the seventy-fourth resistor R74 is grounded through the fiftieth capacitor.

[0314] Optional, in Fig.12 In an example, the display circuit includes:

[0315] A second light-emitting unit, one end of the second light-emitting unit is coupled to the output end of the low-voltage conversion circuit, and the other end of the second light-emitting unit is coupled to the display end 14 through a seventy-sixth resistor R76.

[0316] Specifically, in some embodiments, the second light emitting unit is filtered by the seventy-sixth resistor R76 to provide a status indication.

[0317] Optional, in Fig.14 In an example, the debugging circuit includes:

[0318] A second double-row pin, a first pin of the second double-row pin is coupled to the output end of the low-voltage conversion circuit, a second pin of the second double-row pin is grounded, and a third pin of the second double-row pin is coupled to the debugging end 15 through the seventy-seventh resistor R77 and / or is grounded through the fifty-first capacitor C51.

[0319] Specifically, the debugging circuit is used for debugging or demonstration, and flexible access of debugging signals is achieved through the second double-row pins.

[0320] Optional, in Figure 2 In the example, the digital power supply terminal DVDD is coupled to the output terminal of the low voltage conversion circuit through a fourth inductor L4;

[0321] The digital ground terminal DVSS is grounded, and a forty-fifth capacitor C45 and a forty-sixth capacitor C46 are connected in parallel between the digital power terminal DVDD and the digital ground terminal DVSS;

[0322] The analog ground terminal AVSS is grounded; the analog power supply terminal is coupled to the output terminal of the low voltage conversion circuit; a forty-seventh capacitor C47, a forty-eighth capacitor C48 and a forty-ninth capacitor C49 are connected in parallel between the analog ground terminal AVSS and the analog power supply terminal;

[0323] A forty-third capacitor C43 and a forty-fourth capacitor C44 are connected in parallel between the voltage stabilizing terminal VCAP and the ground terminal.

[0324] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A compressor inverter circuit, characterized in that: include: The input circuit comprises a first switch unit, wherein the first switch unit is coupled between an output terminal of the input circuit and a ground terminal; The main control chip includes: a front-stage voltage detection terminal, a rear-stage voltage detection terminal, a current detection terminal, a switch control terminal, a main control chip power supply terminal, a motor three-phase output terminal, and a motor feedback terminal; The front-stage voltage detection terminal is coupled to the first sub-output terminal between the input terminal and the output terminal of the input circuit through the front-stage voltage detection circuit; The rear-stage voltage detection terminal is coupled to the output terminal of the input circuit through a rear-stage voltage detection circuit; The current detection terminal is coupled to the second sub-output terminal between the input terminal and the output terminal of the input circuit through a current detection circuit; The switch control terminal is coupled to the driving terminal of the first switch unit through a driving circuit; the main control chip controls the conduction of the first switch unit through the switch control terminal according to the input signals of the front-stage voltage detection terminal and the rear-stage voltage detection terminal, thereby controlling the output voltage of the input circuit; The output end of the input circuit is coupled to the power supply end of the main control chip through a high-voltage conversion circuit; The three-phase output terminal of the motor is coupled to the inverter motor through the motor drive frequency conversion circuit; the motor feedback terminal is coupled between the input terminal and the output terminal of the motor drive frequency conversion circuit; the main control chip adjusts the on-off of the motor drive frequency conversion circuit through the three-phase output terminal of the motor according to the feedback signal of the motor feedback terminal, thereby adjusting the speed of the inverter motor; A low voltage conversion circuit, wherein the input end of the low voltage conversion circuit is coupled to the output end of the high voltage conversion circuit, and the output end of the low voltage conversion circuit outputs a working voltage.

2. The compressor inverter circuit according to claim 1, characterized in that: The input circuit further comprises: The three-phase input terminal includes a live wire input terminal, a neutral wire input terminal and a ground wire input terminal; the ground wire input terminal is grounded; The common mode suppression inductor comprises a first winding and a second winding; the live wire input end is coupled to one end of the first winding via a fuse and a magnetic ring in sequence; the neutral wire input end is coupled to one end of the second winding via a magnetic ring; the other ends of the first winding and the second winding are coupled to the output end of the input circuit via a rectifier bridge; an adjustable resistor coupled between one end of the first winding and one end of the second winding; A first capacitor connected in parallel with the adjustable resistor; A first resistor string is connected in parallel with the first capacitor, wherein the first resistor string includes a first resistor, a second resistor, and a third resistor connected in sequence; a second capacitor, one end of the second capacitor being coupled to the other end of the first winding, and the other end of the second capacitor being coupled to the other end of the second winding via a third capacitor and a fourth resistor in sequence; a fourth capacitor, one end of the fourth capacitor being coupled to the first input end of the rectifier bridge, and the other end of the fourth capacitor being coupled to the second input end of the rectifier bridge via the first inductor; A second inductor is coupled between the output end of the rectifier bridge and the output end of the input circuit; The first sub-output terminal is arranged between the output terminal of the rectifier bridge and the second inductor; a first diode, wherein an anode of the first diode is coupled to the second inductor, and a cathode of the first diode is coupled to an output end of the input circuit; a fifth resistor, one end of the fifth resistor being coupled to the second sub-output end, and the other end of the fifth resistor being coupled to the driving end of the first switch unit through a sixth resistor; a first end of the first switch unit being coupled to the second inductor, and a second end of the first switch unit being coupled to ground; and the sixth resistor being grounded; The connection point between the fifth resistor and the fourth capacitor is the second sub-output terminal; a fifth capacitor, one end of the fifth capacitor being coupled to a connection point between the second capacitor and the third capacitor, and the other end of the fifth capacitor being coupled to a third input end of the rectifier bridge; A connection point between the second capacitor and the third capacitor is grounded; a sixth capacitor, the sixth capacitor being connected in parallel with the sixth resistor; A seventh capacitor and a first energy storage filter capacitor are connected in parallel between the output terminal of the input circuit and the ground terminal; one end of the seventh capacitor is coupled to the first diode.

3. The compressor inverter circuit according to claim 1, characterized in that: The front-stage voltage detection circuit comprises: a seventh resistor, one end of the seventh resistor being coupled to the first sub-output end, and the other end of the seventh resistor being grounded through an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor in sequence; a twelfth resistor, one end of the twelfth resistor being coupled to a connection point between the tenth resistor and the eleventh resistor, and the other end of the twelfth resistor being coupled to the front-stage voltage detection end; An eighth capacitor is connected in parallel with the eleventh resistor.

4. The compressor inverter circuit according to claim 1, characterized in that: The post-stage voltage detection circuit comprises: a thirteenth resistor, one end of the thirteenth resistor is coupled to the output end of the input circuit, and the other end of the thirteenth resistor is grounded through a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor in sequence; a seventeenth resistor, one end of the seventeenth resistor being coupled to a connection point between the fifteenth resistor and the sixteenth resistor, and the other end of the seventeenth resistor being coupled to the subsequent voltage detection end; A ninth capacitor is connected in parallel with the sixteenth resistor.

5. The compressor inverter circuit according to claim 1, characterized in that: The three-phase output end of the motor includes: a first phase output end, a second phase output end, a third phase output end, a first upper driving end, a first lower driving end, a second upper driving end, a second lower driving end, a third upper driving end and a third lower driving end; The three phases of the inverter motor are respectively coupled to the first phase output terminal, the second phase output terminal and the third phase output terminal; The motor drive frequency conversion circuit comprises: a first phase control circuit, a second phase control circuit and a third phase control circuit; The first phase control circuit comprises: A second switch unit, wherein a first end of the second switch unit is coupled to the output end of the input circuit, and a second end of the second switch unit is coupled to the first phase output end; a second diode, wherein an anode of the second diode is coupled to the control end of the second switch unit through a nineteenth resistor, and a cathode of the second diode is coupled to the first upper driving end; a twentieth resistor, one end of which is coupled to the first upper driving end, and the other end of which is coupled to the first phase output end via a twenty-first resistor; and a connection point between the twenty-first resistor and the twenty-first resistor is coupled to the control end of the second switch unit; a tenth capacitor, coupled between the control terminal and the second terminal of the second switch unit, and connected in parallel with the twenty-first resistor; A third switch unit, wherein a first end of the third switch unit is coupled to a second end of the second switch unit, and a second end of the third switch unit is coupled to the motor feedback end; a third diode, wherein an anode of the third diode is coupled to the control end of the third switch unit through a twenty-second resistor, and a cathode of the third diode is coupled to the first lower driving end; a twenty-third resistor, one end of the twenty-third resistor being coupled to the first lower driving end, and the other end of the twenty-third resistor being coupled to the second end of the third switch unit through a twenty-fourth resistor; an eleventh capacitor, coupled between the control terminal and the second terminal of the third switch unit, and connected in parallel with the twenty-fourth resistor; And / or, the second phase control circuit includes: a fourth switch unit, wherein a first end of the fourth switch unit is coupled to the output end of the input circuit, and a second end of the fourth switch unit is coupled to the second phase output end; a fourth diode, an anode of the fourth diode being coupled to the control end of the fourth switch unit through a twenty-fifth resistor, and a cathode of the fourth diode being coupled to the second upper driving end; a twenty-sixth resistor, one end of the twenty-sixth resistor being coupled to the second upper driving end, the other end of the twenty-sixth resistor being coupled to the second phase output end via a twenty-seventh resistor; and a connection point between the twenty-sixth resistor and the twenty-seventh resistor being coupled to the control end of the fourth switch unit; a twelfth capacitor, coupled between the control terminal and the second terminal of the fourth switch unit, and connected in parallel with the twenty-seventh resistor; a fifth switch unit, wherein a first end of the fifth switch unit is coupled to a second end of the fourth switch unit, and a second end of the fifth switch unit is coupled to the motor feedback end; a fifth diode, an anode of the fifth diode being coupled to the control end of the fifth switch unit through a twenty-eighth resistor, and a cathode of the fifth diode being coupled to the second lower driving end; a twenty-ninth resistor, one end of the twenty-ninth resistor being coupled to the second lower driving end, and the other end of the twenty-ninth resistor being coupled to the second end of the fifth switch unit via a thirty-ninth resistor; a thirteenth capacitor, coupled between the control terminal and the second terminal of the fifth switch unit, and connected in parallel with the thirtieth resistor; And / or, the third phase control circuit includes: a sixth switch unit, wherein a first end of the sixth switch unit is coupled to the output end of the input circuit, and a second end of the sixth switch unit is coupled to the third phase output end; a sixth diode, an anode of the sixth diode being coupled to the control end of the sixth switch unit through a thirty-first resistor, and a cathode of the sixth diode being coupled to the third upper driving end; a thirty-second resistor, one end of the thirty-second resistor being coupled to the third upper driving end, and the other end of the thirty-second resistor being coupled to the third phase output end via a thirty-third resistor; and a connection point between the thirty-second resistor and the thirty-third resistor being coupled to the control end of the sixth switch unit; a fourteenth capacitor, coupled between the control terminal and the second terminal of the sixth switch unit, and connected in parallel with the thirty-third resistor; a seventh switch unit, wherein a first end of the seventh switch unit is coupled to a second end of the sixth switch unit, and a second end of the seventh switch unit is coupled to the motor feedback end; a seventh diode, an anode of the seventh diode being coupled to the control end of the seventh switch unit through a thirty-fourth resistor, and a cathode of the seventh diode being coupled to the third lower driving end; a thirty-fifth resistor, one end of the thirty-fifth resistor being coupled to the third lower driving end, and the other end of the thirty-fifth resistor being coupled to the second end of the seventh switch unit via a thirty-sixth resistor; The fifteenth capacitor is coupled between the control terminal and the second terminal of the seventh switch unit, and is connected in parallel with the thirty-sixth resistor.

6. The compressor inverter circuit according to claim 1, characterized in that: The main control chip also includes a motor current detection output terminal, including: a detection positive output terminal and a detection negative output terminal; the motor feedback terminal is grounded through a thirty-seventh resistor; The motor current detection output terminal is coupled to both ends of the thirty-seventh resistor through a motor current detection circuit; The motor current detection circuit comprises: A thirty-eighth resistor, one end of the thirty-eighth resistor is coupled to the detection positive output end, and the other end of the thirty-eighth resistor is coupled to one end of the thirty-seventh resistor via a thirty-ninth resistor and a fortieth resistor in sequence; a forty-first resistor, one end of the forty-first resistor being coupled between the thirty-eighth resistor and the thirty-ninth resistor, and the other end of the forty-first resistor being coupled to the output end of the low voltage conversion circuit; A sixteenth capacitor, one end of the sixteenth capacitor is coupled to the detection positive output end, and the other end of the sixteenth capacitor is grounded; a seventeenth capacitor, one end of the seventeenth capacitor being coupled to the thirty-eighth resistor, and the other end of the seventeenth capacitor being grounded; a 42nd resistor, one end of the 42nd resistor being coupled to the detection negative output end, and the other end of the 42nd resistor being coupled to the other end of the 37th resistor via a 43rd resistor and a 44th resistor in sequence; a 45th resistor, one end of the 45th resistor is coupled between the 42nd resistor and the 43rd resistor, and the other end of the 45th resistor is coupled to the output end of the low voltage conversion circuit; An eighteenth capacitor, one end of the eighteenth capacitor is coupled to the detection negative output terminal, and the other end of the eighteenth capacitor is grounded; A nineteenth capacitor, one end of the nineteenth capacitor is coupled to the forty-second resistor, and the other end of the nineteenth capacitor is grounded.

7. The compressor inverter circuit according to claim 1, characterized in that: The driving circuit comprises: a forty-sixth resistor, one end of which is coupled to the switch control end; The first switch chip comprises: a first chip input terminal, a first chip power supply terminal, a first sub-output terminal and a second sub-output terminal; The other end of the forty-sixth resistor is coupled to the first chip input end; the first chip power supply end is coupled to the output end of the high-voltage conversion circuit; an eighth diode, an anode of the eighth diode being coupled to the driving end of the first switch unit through a forty-seventh resistor, and a cathode of the eighth diode being coupled to the first sub-output end and / or the second sub-output end; a 48th resistor, one end of the 48th resistor is coupled to the cathode of the eighth diode, and the other end of the 48th resistor is coupled to the driving end of the first switch unit; a twentieth capacitor, one end of the twentieth capacitor is coupled to the forty-sixth resistor, and the other end of the twentieth capacitor is grounded; A twenty-first capacitor, one end of which is coupled to the first chip power supply end, and the other end of which is grounded; The twenty-second capacitor is connected in parallel with the twenty-first capacitor.

8. The compressor inverter circuit according to claim 1, characterized in that: The high voltage conversion circuit comprises: The second switch chip comprises: a second chip input terminal, a second chip output terminal and a second chip ground terminal; The output terminal of the input circuit is coupled to the second chip input terminal and / or grounded; A second energy storage filter capacitor, coupled between the second chip output terminal and the second chip ground terminal; a ninth diode, wherein an anode of the ninth diode is coupled to the power supply terminal of the main control chip, and a cathode of the ninth diode is coupled to the output terminal of the second chip; a tenth diode, wherein an anode of the tenth diode is grounded, and a cathode of the tenth diode is coupled to a cathode of the second energy storage filter capacitor; a third inductor coupled between the anode of the ninth diode and the cathode of the tenth diode; a third energy storage filter capacitor, coupled between the anode of the ninth diode and the anode of the tenth diode; A twenty-third capacitor, one end of which is coupled to the output end of the input circuit, and the other end of which is grounded; A twenty-fourth capacitor, one end of which is coupled to the power supply end of the main control chip, and the other end of which is grounded; A first light-emitting unit, one end of the first light-emitting unit is coupled to the output end of the high-voltage conversion circuit through a forty-ninth resistor, and the other end of the first light-emitting unit is grounded.

9. The compressor inverter circuit according to claim 1, characterized in that: The low voltage conversion circuit comprises: The third switch chip comprises: a third chip input terminal, a third chip output terminal and a third chip ground terminal; The output terminal of the high voltage conversion circuit is coupled to the input terminal of the third chip through a 50th resistor; the ground terminal of the third chip is grounded; a fifty-first resistor, connected in parallel with the fiftieth resistor; a fourth energy storage filter capacitor, wherein a positive electrode of the fourth energy storage filter capacitor is coupled to the input terminal of the third chip, and a negative electrode of the fourth energy storage filter capacitor is grounded; A twenty-fifth capacitor, connected in parallel with the fourth energy storage filter capacitor; a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to the output end of the third chip, and a negative electrode of the fifth energy storage filter capacitor is grounded; The twenty-sixth capacitor is connected in parallel with the fifth energy storage filter capacitor.

10. The compressor inverter circuit according to claim 1, characterized in that: The current detection terminal includes: a positive current detection terminal and a negative current detection terminal; The current detection circuit comprises: a fifty-second resistor, one end of the fifty-second resistor being coupled to the current positive detection end, and the other end of the fifty-second resistor being grounded via a fifty-third resistor and a fifty-fourth resistor in sequence; a fifty-fifth resistor, one end of the fifty-fifth resistor being coupled between the fifty-second resistor and the fifty-third resistor, and the other end of the fifty-fifth resistor being coupled to the output end of the low voltage conversion circuit; A twenty-seventh capacitor, one end of which is coupled to the current positive detection end, and the other end of which is grounded; a twenty-eighth capacitor, one end of the twenty-eighth capacitor being coupled to the fifty-second resistor, and the other end of the twenty-eighth capacitor being grounded; a fifty-sixth resistor, one end of the fifty-sixth resistor being coupled to the negative current detection end, and the other end of the fifty-sixth resistor being coupled to the second sub-output end via a fifty-seventh resistor and a fifty-eighth resistor in sequence; a fifty-ninth resistor, one end of the fifty-ninth resistor being coupled between the fifty-sixth resistor and the fifty-seventh resistor, and the other end of the fifty-ninth resistor being coupled to the output end of the low voltage conversion circuit; A twenty-ninth capacitor, one end of which is coupled to the negative current detection end, and the other end of which is grounded; a 30th capacitor, one end of the 30th capacitor is coupled to the 56th resistor, and the other end of the 30th capacitor is grounded; The thirty-first capacitor is coupled between the fifty-fourth resistor and the fifty-eighth resistor.

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