Air conditioner

Abstract

The embodiment of the invention provides an air conditioner, and relates to the technical field of air conditioners. According to the air conditioner, interference in a circuit is reduced by changing typesetting of the power module. The air conditioner comprises an indoor unit and an outdoor unit, wherein the outdoor unit comprises a power module; the power supply module comprises a rectifier, a transformer, a switching tube, a microcontroller and a first capacitor; the rectifier is electrically connected with the input end of the power module; the transformer comprises an input winding and a first output winding; the first end of the input winding is electrically connected with the first output end of the rectifier; the first end and the second end of the first output winding are electrically connected with the two ends of a load respectively. The first pole of the switching tube is electrically connected with the second end of the input winding, and the second pole of the switching tube is electrically connected with the second output end of the rectifier; the output end of the microcontroller is electrically connected with the control electrode of the switching tube; the first end of the first capacitor is electrically connected with the second output end of the rectifier, and the second end of the first capacitor is electrically connected with the second end of the first output winding.

Description

Technical Field

[0001] The invention relates to the field of electrical appliances, and in particular to an air conditioner. Background Art

[0002] With the continuous development of daily household appliance technology, more and more electrical appliances are entering people's daily life and work. At the same time, due to the improvement of scientific and technological levels in real life, people also have higher demands for the intelligence of electrical appliances. For this reason, electrical appliances should also be optimized and improved accordingly.

[0003] Taking air conditioners as an example, the power modules on air conditioners currently do not have the online upgrade function, which makes it rather cumbersome to replace the power modules.

[0004] At the same time, the power module includes: a microcontroller, that is, a chip; there are many chip suppliers, and because the pin definitions of each chip manufacturer are different, it is difficult to upgrade; and the PCB layout in the power module circuit is difficult, which reduces the processing efficiency. Summary of the invention

[0005] An embodiment of the present application provides an air conditioner that reduces interference in a circuit by changing the layout of a power module.

[0006] The embodiment of the present application provides an air conditioner, which includes an indoor unit and an outdoor unit, wherein the outdoor unit is electrically connected to the indoor unit, and the outdoor unit includes a power module.

[0007] The power module includes: a rectifier, a transformer, a switch tube, a microcontroller and a first capacitor; the rectifier is electrically connected to the input end of the power module; the transformer includes: an input winding and a first output winding; the first end of the input winding is electrically connected to the first output end of the rectifier; the first end and the second end of the first output winding are electrically connected to the two ends of the load respectively; the first pole of the switch tube is electrically connected to the second end of the input winding, and the second pole of the switch tube is electrically connected to the second output end of the rectifier; the output end of the microcontroller is electrically connected to the control pole of the switch tube; the first end of the first capacitor is electrically connected to the second output end of the rectifier, and the second end of the first capacitor is electrically connected to the second end of the first output winding.

[0008] Based on the above technical solution, the air conditioner provided in some embodiments of the present application can reduce the electromagnetic interference of the power module when it is working by adding a first capacitor. By changing the layout of the power module, not only the electromagnetic interference of the power module when it is working can be reduced, but also the processing efficiency can be improved.

[0009] In some embodiments, the transformer also includes: a second output winding, a first end of the second output winding is electrically connected to the power supply end of the microcontroller; the power supply module also includes: a first diode, a positive end of the first diode is electrically connected to the first end of the second output winding, and a negative end of the first diode is electrically connected to the power supply end of the microcontroller; a second capacitor, a first end of the second capacitor is electrically connected to the negative end of the first diode, and a second end of the second capacitor is electrically connected to the second end of the second output winding.

[0010] In some embodiments, the power supply module also includes: a first resistor, a second resistor and a third resistor; the first end of the first resistor is electrically connected to the output end of the microcontroller, and the second end of the first resistor is electrically connected to the control electrode of the switching tube; the first end of the second resistor is electrically connected to the current feedback end of the microcontroller, and the second end of the second resistor is electrically connected to the second electrode of the switching tube; the first end of the third resistor is electrically connected to the second end of the second resistor, and the second end of the third resistor is electrically connected to the second output end of the rectifier.

[0011] In some embodiments, the power supply module also includes: a third capacitor, a fourth capacitor and a second diode; the first end of the third capacitor is electrically connected to the first output end of the rectifier, and the second end of the third capacitor is electrically connected to the second output end of the rectifier; the first end of the fourth capacitor is electrically connected to the first output end of the transformer, and the second end of the fourth capacitor is electrically connected to the second output end of the transformer; the positive terminal of the second diode is electrically connected to the first output end of the transformer, and the negative terminal of the second diode is electrically connected to the first end of the fourth capacitor.

[0012] In some embodiments, the power supply module also includes: a voltage stabilizing module and a photoelectric coupler; the first end of the voltage stabilizing module is electrically connected to the first end of the first output winding; the first input end of the photoelectric coupler is electrically connected to the second end of the voltage stabilizing module, the second input end of the photoelectric coupler is electrically connected to the second end of the first output winding, and is also electrically connected to the third end of the voltage stabilizing module; the first output end of the photoelectric coupler is electrically connected to the voltage feedback end of the microcontroller, the second output end of the photoelectric coupler is electrically connected to the input end of the power supply module, and is also electrically connected to the ground end of the microcontroller.

[0013] In some embodiments, the power supply module also includes: a fifth capacitor and a sixth capacitor; the first end of the fifth capacitor is electrically connected to the voltage feedback end of the microcontroller, and the second end of the fifth capacitor is also electrically connected to the second output end of the photocoupler; the first end of the sixth capacitor is electrically connected to the current feedback end of the microcontroller, and the second end of the sixth capacitor is also electrically connected to the second output end of the photocoupler.

[0014] In some embodiments, the input end of the power module includes a first input end and a second input end; the power module also includes: a seventh capacitor, a third diode and a fourth diode; the first end of the seventh capacitor is electrically connected to the first input end of the power module, and the second end of the seventh capacitor is electrically connected to the second input end of the power module; the positive end of the third diode is electrically connected to the first input end of the power module, the negative end of the third diode is electrically connected to the control end of the microcontroller, and is also electrically connected to the second output end of the photocoupler; the positive end of the fourth diode is electrically connected to the second input end of the power module, and the negative end of the fourth diode is electrically connected to the negative end of the third diode.

[0015] In some embodiments, the power supply module also includes: a fourth resistor, a fifth resistor and a sixth resistor; the first end of the fourth resistor is electrically connected to the negative end of the third diode, and the second end of the fourth resistor is electrically connected to the control end of the microcontroller; the first end of the fifth resistor is electrically connected to the negative end of the first diode; the first end of the sixth resistor is electrically connected to the second end of the fifth resistor, and is also electrically connected to the frequency conversion end of the microcontroller, and the second end of the sixth resistor is electrically connected to the second output end of the photoelectric coupler.

[0016] In some embodiments, the transformer also includes: multiple third output windings; the first end and the second end of the third output winding are electrically connected to the two ends of the load respectively; the voltage between the first end and the second end of the multiple third output windings and the voltage between the first end and the second end of the first output winding are different from each other.

[0017] In some embodiments, the transformer also includes: multiple third output windings, the first end and the second end of the third output winding are electrically connected to the two ends of the load respectively; the voltage between the first end and the second end of the multiple third output windings and the voltage between the first end and the second end of the first output winding are different from each other; the power supply module also includes a voltage conversion module, the voltage conversion module is electrically connected to one of the third output windings or the first output winding, and the voltage conversion module is configured to convert the voltage output by the connected third output winding or the first output winding, and output the converted voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0019] Figure 1 A circuit diagram of an existing power supply module provided by an embodiment of the present invention;

[0020] Figure 2 A structural block diagram of an air conditioner provided by an embodiment of the present invention;

[0021] Figure 3 A simplified circuit diagram of a power module provided by an embodiment of the present invention;

[0022] Figure 4 A circuit diagram of a flyback architecture provided by an embodiment of the present invention;

[0023] Figure 5 A voltage and current waveform diagram of a flyback architecture provided by an embodiment of the present invention;

[0024] Figure 6 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0025] Figure 7 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0026] Figure 8 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0027] Fig. 9 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0028] Fig.10 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0029] Fig.11 A simplified circuit diagram of another power module provided by an embodiment of the present invention;

[0030] Fig.12 A circuit diagram of a power module provided by an embodiment of the present invention;

[0031] Fig.13 A structural block diagram of a transformer provided by an embodiment of the present invention;

[0032] Fig.14 A structural block diagram of another transformer provided by an embodiment of the present invention;

[0033] Fig.15A schematic diagram of an unpotted power module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present invention have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0038] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0039] As described in the background technology, with the continuous development of daily household appliance technology, more and more electrical appliances have entered people's daily life and work. At the same time, due to the improvement of scientific and technological levels in real life, people also have corresponding higher demands for the intelligence of electrical appliances. For this reason, electrical appliances should also be optimized and improved accordingly.

[0040] Taking air conditioners as an example, the power modules on air conditioners currently do not have the online upgrade function, which makes it rather cumbersome to replace the power modules.

[0041] At the same time, the power module includes: a microcontroller, that is, a chip; there are many chip suppliers, and because the pin definitions of each chip manufacturer are different, it is difficult to upgrade; and the PCB layout in the power module circuit is difficult, which reduces the processing efficiency.

[0042] Reference Figure 1 , Figure 1 The power module 10' includes: a rectifier 1', a transformer 2', a photoelectric coupler 3', a power chip 4' and a voltage regulator diode D'.

[0043] Among them, the first input end of the rectifier 1' is electrically connected to the first output end of the AC power supply, the second input end of the rectifier 1' is electrically connected to the second output end of the AC power supply, the first output end of the rectifier 1' is electrically connected to the first input end of the transformer, and the second output end of the rectifier 1' is grounded; the second input end of the transformer 2' is electrically connected to the output end DRAIN of the power chip 4'; the first output end and the second output end of the transformer 2' are electrically connected to the load.

[0044] Multiple ground terminals GND of the power chip 4' are grounded, the power terminal VCC of the power chip 4' is electrically connected to the second output terminal of the photocoupler 3', and the voltage feedback terminal FB of the power chip 4' is electrically connected to the first output terminal of the photocoupler 3'; the first input terminal of the photocoupler 3' is electrically connected to the first output terminal of the transformer, the second input terminal of the photocoupler 3' is electrically connected to the first terminal of the Zener diode, and the second terminal of the Zener diode is grounded.

[0045] The existing power module layout will generate electromagnetic interference, which is not conducive to the normal operation of the power module. At the same time, the power chip has different management definitions and is not easy to replace.

[0046] Based on this, the present application provides an air conditioner. Figure 2 As shown, the air conditioner 1000 includes: an indoor unit 100 and an outdoor unit 200; the outdoor unit 200 is electrically connected to the indoor unit 100; and the outdoor unit 200 includes: a power module 10.

[0047] like Figure 3 As shown, the power module 10 includes: a rectifier 1, a transformer 2, a switch tube 3, a microcontroller 4 and a first capacitor C1; the rectifier 1 is electrically connected to the input end of the power module 10.

[0048] The transformer 2 includes: an input winding Wi and a first output winding Wo1; the first end of the input winding Wi is electrically connected to the first output end of the rectifier 1; the first end and the second end of the first output winding Wo1 are electrically connected to the two ends of the load respectively; the first pole of the switch tube 3 is electrically connected to the second end of the input winding Wi, and the second pole of the switch tube 3 is electrically connected to the second output end of the rectifier 1; the output end of the microcontroller 4 is electrically connected to the control pole of the switch tube 3; the first end of the first capacitor C1 is electrically connected to the second output end of the rectifier 1, and the second end of the first capacitor C1 is electrically connected to the second end of the first output winding Wo1.

[0049] The input end of the power module 10 is electrically connected to an AC power source. The AC power source sends an AC voltage signal and transmits the AC voltage signal to the rectifier 1; the rectifier 1 converts the AC voltage signal into a DC voltage signal and transmits the DC voltage signal to the input winding Wi of the transformer 2; the transformer 2 reduces or amplifies the DC voltage signal so that the DC voltage signal is converted into a suitable voltage signal, which is then transmitted to the load via the first output winding Wo1 of the transformer 2 to provide voltage for the load.

[0050] In some embodiments, the load is an electronic expansion valve and a water pump.

[0051] like Figure 4 and Figure 5 As shown, the transformer 2 and the switch tube 3 can constitute Figure 4 The flyback structure in.

[0052] Among them, the self-excited type is a switching power supply composed of an intermittent oscillation circuit. It is mainly composed of power tubes and transformers. Through self-excited oscillation, direct current is converted into a pulse voltage on the primary side, coupled to the secondary side through a transformer, and then sent to the load circuit through diode rectification and capacitor filtering. The transformer participates in its oscillation, and no signal source is required. It can oscillate on its own, which is equivalent to a transformer feedback oscillation circuit.

[0053] The flyback structure refers to a flyback switching power supply, which is a switching power supply that uses a flyback high-frequency transformer to isolate the input and output circuits. A flyback switching power supply, sometimes called a Flyback power supply or an ON / OFF power supply, achieves energy transfer through the interaction of the switch tube and the secondary rectifier diode. The most important feature of a flyback switching power supply is that the transformer winding and the connection method of the switching device make it impossible for the primary and secondary sides of the transformer to be turned on at the same time.

[0054] During the on-time of the switch tube: According to the polarity of the transformer's same-name terminal, the diode is cut off due to the reverse voltage. The switch current Id flows through the primary side of the transformer and the switch tube, storing energy in the switch transformer.

[0055] During the off period of the switch tube: After the switch tube is turned off, the energy stored in the transformer is released to the load through the diode. During the off period, the voltage applied between the drain and source of the switch tube consists of two parts: surge voltage Vd and shoulder voltage Vds.

[0056] Among them, "flyback" means that when the switch is turned on, when the input is high, the inductor or capacitor in series in the output circuit is in a discharged state; on the contrary, when the switch is turned off, when the input is high, the inductor or capacitor in series in the output circuit is in a charged state. The flyback structure has a low cost and can output multiple voltages.

[0057] Among them, the surge voltage is the oscillating voltage caused by the energy remaining in the primary side of the transformer during the discharge period when the coupling between the primary and secondary sides of the transformer is incomplete. The coupling characteristics of the transformer can be represented by the leakage inductance. The surge voltage is related to the switching current and the leakage inductance of the transformer.

[0058] The air conditioner provided in some embodiments of the present application can reduce the electromagnetic interference of the power module when it is working by adding a first capacitor. By changing the layout of the power module, not only can the electromagnetic interference of the power module when it is working be reduced, but also the processing efficiency can be improved.

[0059] like Figure 6 As shown, the transformer also includes: a second output winding Wo2, a first end of the second output winding Wo2 is electrically connected to the power supply terminal VCC of the microcontroller 4; the power supply module 10 also includes: a first diode D1 and a second capacitor C2, a positive terminal of the first diode D1 is electrically connected to the first end of the second output winding Wo2, and a negative terminal of the first diode D1 is electrically connected to the power supply terminal VCC of the microcontroller 4.

[0060] A second capacitor C2, a first end of the second capacitor C2 is electrically connected to the cathode end of the first diode D1, and a second end of the second capacitor C2 is electrically connected to the second end of the second output winding Wo2.

[0061] The second capacitor C2 is configured for filtering.

[0062] That is to say, the DC voltage signal transmitted through the input winding of the transformer 2 will not only be amplified or reduced by the first output winding Wo1, but also by the second output winding Wo2. The DC voltage converted by the second output winding Wo2 can provide a working voltage for the microcontroller 4. For example, if the working voltage of the microcontroller 4 is 5V, and the voltage value of the DC voltage signal is 100V, the voltage value of the DC voltage signal can be reduced from 100V to 5V through the second output winding Wo2, so that the microcontroller 4 can be powered.

[0063] like Figure 7As shown, the power module 10 further includes: a first resistor R1, a second resistor R2 and a third resistor R3.

[0064] A first end of the first resistor R1 is electrically connected to the output end OUT of the microcontroller 4, and a second end of the first resistor R1 is electrically connected to the control electrode of the switch tube 3; a first end of the second resistor R2 is electrically connected to the current feedback end CS of the microcontroller 4, and a second end of the second resistor R2 is electrically connected to the second electrode of the switch tube 3; a first end of the third resistor R3 is electrically connected to the second end of the second resistor R2, and a second end of the third resistor R3 is electrically connected to the second output end of the rectifier.

[0065] The first resistor R1 , the second resistor R2 and the third resistor R3 are all configured to limit current.

[0066] For example, the on-state voltage of the switch tube 3 is 5V. If the output voltage of the output terminal OUT of the microcontroller 4 is much greater than 5V, the switch tube 3 will be damaged. At this time, the first resistor R1 is required to play a current limiting role so that the voltage transmitted from the output terminal OUT of the microcontroller 4 to the switch tube 3 will not damage the switch tube 3.

[0067] For example, the rated current range in the power module 10 is 10A to 20A. If the current in the power module 10 is 20A, the current is relatively large. At this time, the second resistor R2 and the third resistor R3 play a current limiting role, so that the microcontroller 4 will not be damaged; if the current in the power module 10 is 25A, the current is too large and the current will be fed back to the current feedback terminal CS of the microcontroller 4. When the current feedback terminal CS of the microcontroller 4 detects that the current in the power module 10 exceeds the rated current range, the current feedback terminal CS of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the large current from damaging the power module 10.

[0068] like Figure 8 As shown, the power module 10 further includes: a third capacitor C3, a fourth capacitor C4 and a second diode D2.

[0069] A first end of the third capacitor C3 is electrically connected to the first output end of the rectifier, and a second end of the third capacitor C3 is electrically connected to the second output end of the rectifier; a first end of the fourth capacitor C4 is electrically connected to the first output end of the transformer 2, and a second end of the fourth capacitor C4 is electrically connected to the second output end of the transformer 2; a positive terminal of the second diode D2 is electrically connected to the first output end of the transformer 2, and a negative terminal of the second diode D2 is electrically connected to the first end of the fourth capacitor C4.

[0070] The third capacitor C3 and the fourth capacitor C4 are configured for filtering.

[0071] In some embodiments, the third capacitor C3 and the fourth capacitor C4 are both electrolytic capacitors.

[0072] like Fig. 9 As shown, the power module 10 further includes: a voltage stabilizing module 5 and a photoelectric coupler 6 .

[0073] The first end of the voltage stabilizing module 5 is electrically connected to the first end of the first output winding Wo1; the first input end of the photoelectric coupler 6 is electrically connected to the second end of the voltage stabilizing module 5, the second input end of the photoelectric coupler 6 is electrically connected to the second end of the first output winding Wo1, and is also electrically connected to the third end of the voltage stabilizing module 5; the first output end of the photoelectric coupler 6 is electrically connected to the voltage feedback end FB of the microcontroller 4, the second output end of the photoelectric coupler 6 is electrically connected to the input end of the power supply module 10, and is also electrically connected to the ground end of the microcontroller 4.

[0074] Among them, the optical coupler (OC in English) is also called the photoelectric isolator, or optocoupler for short. The optical coupler uses light as the medium to transmit electrical signals. It has a good isolation effect on the input and output electrical signals, so it is widely used in various circuits. At present, it has become one of the optoelectronic devices with the most types and the widest applications. The optical coupler generally consists of three parts: light emission, light reception and signal amplification. The input electrical signal drives the light emitting diode (LED) to emit light of a certain wavelength, which is received by the photodetector to generate photocurrent, and then output after further amplification. This completes the conversion of electricity → light → electricity, thereby playing the role of input, output and isolation. Since the input and output of the optical coupler are isolated from each other, the electrical signal transmission has the characteristics of unidirectionality, so it has good electrical insulation and anti-interference capabilities. Among them, the light emitting device is generally a light emitting diode. There are many types of photosensitive devices. In addition to photodiodes, there are also photosensitive triodes, photoresistors, photothyristors, etc. Photocouplers can be combined into many series of photocouplers by combining different types of light-emitting devices and photosensitive devices according to different requirements.

[0075] The DC voltage signal in the power module 10 circuit will be transmitted to the voltage feedback terminal FB of the microcontroller 4 through the optocoupler 6. If the DC voltage signal is too large and exceeds the rated voltage range of the power module 10 circuit, the voltage feedback terminal FB of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the high voltage from damaging the power module 10.

[0076] For example, if the rated voltage range of the power module 10 circuit is 100V to 240V, the AC power supply emits an AC voltage signal and transmits the AC voltage signal to the rectifier; the rectifier converts the AC voltage signal into a DC voltage signal and transmits the DC voltage signal to the input winding of the transformer 2, the transformer 2 reduces or amplifies the DC voltage signal, so that the DC voltage signal is converted into a suitable voltage signal, and then transmitted to the second input end of the photocoupler 6 via the first output winding Wo1 of the transformer 2, and the photocoupler 6 then transmits the voltage signal to the voltage feedback end FB of the microcontroller 4 via the first output end.

[0077] If the voltage value of the voltage signal is 150V, the voltage feedback terminal FB of the microcontroller 4 will not act, and the microcontroller 4 will continue to work; if the voltage value of the voltage signal is 260V, the voltage feedback terminal FB of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the high voltage from damaging the power module 10.

[0078] like Fig.10 As shown, the power module 10 further includes: a fifth capacitor C5 and a sixth capacitor C6.

[0079] The first end of the fifth capacitor C5 is electrically connected to the voltage feedback terminal FB of the microcontroller 4, and the second end of the fifth capacitor C5 is also electrically connected to the second output terminal of the photocoupler 6; the first end of the sixth capacitor C6 is electrically connected to the current feedback terminal CS of the microcontroller 4, and the second end of the sixth capacitor C6 is also electrically connected to the second output terminal of the photocoupler 6.

[0080] The fifth capacitor C5 and the sixth capacitor C6 are configured for filtering.

[0081] like Fig.11 As shown, the input end of the power module 10 includes a first input end and a second input end; the power module 10 also includes: a seventh capacitor C7, a third diode D3 and a fourth diode D4.

[0082] The first end of the seventh capacitor C7 is electrically connected to the first input end of the power module 10, and the second end of the seventh capacitor C7 is electrically connected to the second input end of the power module 10; the positive end of the third diode D3 is electrically connected to the first input end of the power module 10, the negative end of the third diode D3 is electrically connected to the control end VH of the microcontroller 4, and is also electrically connected to the second output end of the photocoupler 6; the positive end of the fourth diode D4 is electrically connected to the second input end of the power module 10, and the negative end of the fourth diode D4 is electrically connected to the negative end of the third diode D3.

[0083] Among them, the seventh capacitor C7 is equivalent to the X capacitor. The full name of the X capacitor is generally called: X2 (X1 / X3 / MKP) capacitor for suppressing power supply electromagnetic interference. Generally, its main functions in the circuit are: power supply cross-line circuit, electromagnetic interference filtering, spark elimination circuit, etc. to ensure that the finished electronic product meets the electromagnetic compatibility requirements.

[0084] The third diode D3 and the fourth diode D4 are configured to transmit the AC voltage signal to the control terminal VH of the microcontroller 4. When the control terminal VH of the microcontroller 4 receives the AC voltage signal, the microcontroller 4 is turned on, and the microcontroller 4 starts to work.

[0085] like Fig.12 As shown, the power supply module 10 also includes: a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; the first end of the fourth resistor R4 is electrically connected to the negative end of the third diode D3, and the second end of the fourth resistor R4 is electrically connected to the control end VH of the microcontroller 4; the first end of the fifth resistor R5 is electrically connected to the negative end of the first diode D1; the first end of the sixth resistor R6 is electrically connected to the second end of the fifth resistor R5, and is also electrically connected to the frequency conversion end ACMONI of the microcontroller 4, and the second end of the sixth resistor R6 is electrically connected to the second output end of the photoelectric coupler 6.

[0086] The fourth resistor R4 is configured to limit the current to prevent the microcontroller 4 from being damaged by excessive current; the fifth resistor R5 and the sixth resistor R6 are configured to divide the voltage. If the AC voltage signal is too large and exceeds the rated voltage range of the power module 10 circuit, the frequency conversion terminal ACMONI of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the large voltage from damaging the power module 10.

[0087] For example, if the rated voltage range of the power module 10 circuit is 100V to 240V, the AC power source sends an AC voltage signal and transmits the AC voltage signal to the frequency conversion terminal ACMONI of the microcontroller 4 .

[0088] If the voltage value of the AC voltage signal is 150V, the frequency conversion end ACMONI of the microcontroller 4 will not act, and the microcontroller 4 will continue to work; if the voltage value of the AC voltage signal is 260V, the frequency conversion end ACMONI of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the high voltage from damaging the power module 10.

[0089] like Fig.12 As shown, the power module 10 further includes: a fuse, a first inductor L1, a second inductor L2 and an eighth capacitor C8.

[0090] The first end of the fuse is electrically connected to the first end of the AC power supply, and the second end of the fuse is electrically connected to the first end of the fourth capacitor C4; the first input end of the first inductor L1 is electrically connected to the second end of the fuse, and the second input end of the first inductor L1 is electrically connected to the second end of the AC power supply; the first input end of the second inductor L2 is electrically connected to the first output end of the first inductor L1, the second input end of the second inductor L2 is electrically connected to the second output end of the first inductor L1, the first output end of the second inductor L2 is electrically connected to the first input end of the rectifier, and the second output end of the second inductor L2 is electrically connected to the second input end of the rectifier; the first end of the eighth capacitor C8 is electrically connected to the first output end of the first inductor L1, and the second end of the eighth capacitor C8 is electrically connected to the second output end of the first inductor L1.

[0091] The fuse is configured to prevent a large current from damaging the power module 10 ; the first inductor L1 and the second inductor L2 are configured to reduce electromagnetic interference; and the eighth capacitor C8 is configured to eliminate electromagnetic interference and filter.

[0092] In summary, the AC power source sends an AC voltage signal, and transmits the AC voltage signal to the control terminal VH of the microcontroller 4 via the fuse, the third diode D3 and the fourth diode D4. When the control terminal VH of the microcontroller 4 receives the AC voltage signal, the microcontroller 4 is turned on, and the microcontroller 4 starts to work. At the same time, the control terminal VH of the microcontroller 4 is connected to the power terminal of the microcontroller 4 inside the microcontroller 4. When the control terminal VH of the microcontroller 4 receives the AC voltage signal, it also provides a short voltage signal to the power terminal of the microcontroller 4 until the power terminal of the microcontroller 4 stops when it receives the voltage signal from the second output winding Wo2.

[0093] When the microcontroller 4 is turned on, the frequency conversion terminal ACMONI of the microcontroller 4 will also determine whether the AC voltage signal meets the rated voltage range of the power module 10. If so, the microcontroller 4 starts working; if not, the microcontroller 4 stops working.

[0094] The AC power source sends out an AC voltage signal and transmits the AC voltage signal to the rectifier; the rectifier converts the AC voltage signal into a DC voltage signal and transmits the DC voltage signal to the input winding of the transformer 2. The transformer 2 reduces or amplifies the DC voltage signal, so that the DC voltage signal is converted into a suitable voltage signal, and then transmitted to the load via the first output winding Wo1 of the transformer 2 to provide voltage for the load. At the same time, the DC voltage signal transmitted via the input winding of the transformer 2 will not only be amplified or reduced by the first output winding Wo1, but also by the second output winding Wo2. The DC voltage converted by the second output winding Wo2 can provide a working voltage for the microcontroller 4.

[0095] During the operation of the microcontroller 4, the voltage feedback terminal FB and the current feedback terminal of the microcontroller 4 will always receive the voltage and current in the power module 10. If the rated voltage range or the rated current range of the power module 10 is not met, the microcontroller 4 will stop working to protect the power module 10.

[0096] like Fig.13 As shown, the transformer 2 also includes: multiple third output windings Wo3; the first end and the second end of the third output winding Wo3 are electrically connected to the two ends of the load respectively; the voltage between the first end and the second end of the multiple third output windings Wo3 and the voltage between the first end and the second end of the first output winding Wo1 are different from each other.

[0097] For example, the output voltage of the first output winding Wo1 is 12V, the output voltage of the first third output winding Wo3 is 15V, the output voltage of the second third output winding Wo3 is 17V, and the output voltage of the third third output winding Wo3 is 5V.

[0098] In some embodiments, if the load is the primary side fan IPM power supply, the voltage and current requirements are 15V (15-16) / 0.1A; if the load is the secondary side electronic expansion valve and water pump, the voltage and current requirements are 12V (±5%) / 1A; if the load is the secondary side wire controller, the voltage and current requirements are 17V (16.2-18.6) / 0.4A; if the load is the secondary side MCU and communication circuit, etc., the voltage and current requirements are 5V (±5%) / 0.3A. From the above requirements, it can be seen that when the load is the secondary side electronic expansion valve and water pump, the required accuracy is higher. At this time, it is necessary to detect the output voltage signal through the optocoupler and the voltage feedback end of the microcontroller.

[0099] like Fig.14 As shown, the transformer 2 also includes: multiple third output windings Wo3, the first end and the second end of the third output winding Wo3 are electrically connected to the two ends of the load respectively; the voltage between the first end and the second end of the multiple third output windings Wo3, and the voltage between the first end and the second end of the first output winding Wo1 are different from each other; the power supply module 10 also includes a voltage conversion module, the voltage conversion module is electrically connected to a third output winding Wo3 or the first output winding Wo1, and the voltage conversion module is configured to convert the voltage output by the connected third output winding Wo3 or the first output winding Wo1, and output the converted voltage.

[0100] For example, the output voltage of the first output winding Wo1 is 12V, the output voltage of the first third output winding Wo3 is 15V, the output voltage of the second third output winding Wo3 is 17V, and the output voltage of the voltage conversion module is 5V.

[0101] In some embodiments, the power module may not be encapsulated (see Fig.15 ), can also be potted.

[0102] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: Indoor unit; an outdoor unit, electrically connected to the indoor unit; The outdoor unit comprises: A power module; the power module comprises: A rectifier, electrically connected to an input end of the power module; Transformer, including: An input winding; a first end of the input winding is electrically connected to a first output end of the rectifier; A first output winding, wherein a first end and a second end of the first output winding are electrically connected to two ends of a load respectively; A switch tube, wherein a first pole of the switch tube is electrically connected to the second end of the input winding, and a second pole of the switch tube is electrically connected to the second output end of the rectifier; A microcontroller, wherein an output terminal of the microcontroller is electrically connected to a control electrode of the switch tube; A first capacitor, wherein a first end of the first capacitor is electrically connected to the second output end of the rectifier, and a second end of the first capacitor is electrically connected to the second end of the first output winding.

2. The air conditioner according to claim 1, characterized in that: The transformer also includes: a second output winding, wherein a first end of the second output winding is electrically connected to a power supply end of the microcontroller; The power module also includes: a first diode, wherein a positive terminal of the first diode is electrically connected to a first end of the second output winding, and a negative terminal of the first diode is electrically connected to a power supply terminal of the microcontroller; A second capacitor, wherein a first end of the second capacitor is electrically connected to the cathode end of the first diode, and a second end of the second capacitor is electrically connected to the second end of the second output winding.

3. The air conditioner according to claim 2, characterized in that: The power module also includes: A first resistor, wherein a first end of the first resistor is electrically connected to an output end of the microcontroller, and a second end of the first resistor is electrically connected to a control electrode of the switch tube; a second resistor, wherein a first end of the second resistor is electrically connected to a current feedback end of the microcontroller, and a second end of the second resistor is electrically connected to a second electrode of the switch tube; A third resistor, wherein a first end of the third resistor is electrically connected to a second end of the second resistor, and a second end of the third resistor is electrically connected to a second output end of the rectifier.

4. The air conditioner according to claim 3, characterized in that: The power module also includes: a third capacitor, wherein a first end of the third capacitor is electrically connected to the first output end of the rectifier, and a second end of the third capacitor is electrically connected to the second output end of the rectifier; a fourth capacitor, wherein a first end of the fourth capacitor is electrically connected to the first output end of the transformer, and a second end of the fourth capacitor is electrically connected to the second output end of the transformer; A second diode, wherein a positive terminal of the second diode is electrically connected to the first output terminal of the transformer, and a negative terminal of the second diode is electrically connected to the first terminal of the fourth capacitor.

5. The air conditioner according to any one of claims 1 to 4, characterized in that: The power module also includes: A voltage stabilizing module, a first end of the voltage stabilizing module being electrically connected to a first end of the first output winding; A photoelectric coupler, wherein a first input end of the photoelectric coupler is electrically connected to a second end of the voltage stabilizing module, a second input end of the photoelectric coupler is electrically connected to a second end of the first output winding, and is also electrically connected to a third end of the voltage stabilizing module; The first output end of the photoelectric coupler is electrically connected to the voltage feedback end of the microcontroller, the second output end of the photoelectric coupler is electrically connected to the input end of the power module, and is also electrically connected to the ground end of the microcontroller.

6. The air conditioner according to claim 5, characterized in that: The power module also includes: a fifth capacitor, wherein a first end of the fifth capacitor is electrically connected to a voltage feedback end of the microcontroller, and a second end of the fifth capacitor is also electrically connected to a second output end of the photoelectric coupler; A sixth capacitor, wherein a first end of the sixth capacitor is electrically connected to a current feedback end of the microcontroller, and a second end of the sixth capacitor is also electrically connected to a second output end of the photocoupler.

7. The air conditioner according to any one of claims 1 to 4, characterized in that: The input end of the power module includes a first input end and a second input end; the power module also includes: a seventh capacitor, wherein a first end of the seventh capacitor is electrically connected to the first input end of the power module, and a second end of the seventh capacitor is electrically connected to the second input end of the power module; a third diode, wherein a positive terminal of the third diode is electrically connected to the first input terminal of the power module, a negative terminal of the third diode is electrically connected to the control terminal of the microcontroller, and is also electrically connected to the second output terminal of the photoelectric coupler; A fourth diode, wherein the positive terminal of the fourth diode is electrically connected to the second input terminal of the power module, and the negative terminal of the fourth diode is electrically connected to the negative terminal of the third diode.

8. The air conditioner according to claim 7, characterized in that: The power module also includes: a fourth resistor, wherein a first end of the fourth resistor is electrically connected to the negative terminal of the third diode, and a second end of the fourth resistor is electrically connected to the control terminal of the microcontroller; a fifth resistor, a first end of the fifth resistor being electrically connected to a negative terminal of the first diode; A sixth resistor, wherein a first end of the sixth resistor is electrically connected to the second end of the fifth resistor and is also electrically connected to the frequency conversion end of the microcontroller, and a second end of the sixth resistor is electrically connected to the second output end of the photocoupler.

9. The air conditioner according to claim 1, characterized in that: The transformer also includes: A plurality of third output windings, wherein a first end and a second end of the third output winding are electrically connected to two ends of the load respectively; A voltage between the first end and the second end of the plurality of third output windings and a voltage between the first end and the second end of the first output winding are different from each other.

10. The air conditioner according to claim 1, characterized in that: The transformer also includes: A plurality of third output windings, wherein a first end and a second end of the third output winding are electrically connected to two ends of the load respectively; The voltage between the first end and the second end of the plurality of third output windings and the voltage between the first end and the second end of the first output winding are different from each other; The power supply module also includes a voltage conversion module, which is electrically connected to one of the third output windings or the first output winding. The voltage conversion module is configured to convert the voltage output by the connected third output winding or the first output winding and output the converted voltage.

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