An air conditioner

Abstract

The embodiment of the application provides an air conditioner, and relates to the technical field of air conditioners.The air conditioner reduces interference in a circuit by changing the layout of a power module.The air conditioner comprises an indoor unit and an outdoor unit, and the outdoor unit comprises a power module.The power module comprises a rectifier, a transformer, a switching tube, a microcontroller and a first capacitor.The rectifier is electrically connected to 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 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 a load.The first pole of the switching tube is electrically connected to the second end of the input winding, and the second pole of the switching 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 switching 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.

Description

Technical Field

[0001] This invention relates to the field of electrical appliances, and more particularly to an air conditioner. Background Technology

[0002] With the continuous development of household appliance technology, more and more electrical appliances are entering people's daily lives and work. At the same time, due to the improvement of the level of technology in real life, people have higher demands for the intelligence of electrical appliances. Therefore, electrical appliances should also be optimized and upgraded accordingly.

[0003] Taking air conditioners as an example, the power modules on air conditioners currently do not have online upgrade capabilities, making the replacement of power modules quite cumbersome.

[0004] Meanwhile, the power module includes a microcontroller, which 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 replace; in addition, the PCB layout of the power module circuit is difficult, which reduces the processing efficiency. Summary of the Invention

[0005] This application provides an air conditioner that reduces circuit interference by changing the layout of the power module.

[0006] This application provides an air conditioner. The air conditioner includes an indoor unit and an outdoor unit; the outdoor unit is electrically connected to the indoor unit; the outdoor unit includes a power module.

[0007] The power module includes: a rectifier, a transformer, a switching transistor, a microcontroller, and a first capacitor; the rectifier is electrically connected to the input terminal 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 terminal of the rectifier; the first end and the second end of the first output winding are respectively electrically connected to the two ends of the load; the first terminal of the switching transistor is electrically connected to the second end of the input winding, and the second terminal of the switching transistor is electrically connected to the second output terminal of the rectifier; the output terminal of the microcontroller is electrically connected to the control terminal of the switching transistor; the first end of the first capacitor is electrically connected to the second output terminal 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 solutions, the air conditioner provided in some embodiments of this application can reduce the electromagnetic interference when the power module is working by adding a first capacitor. By changing the layout of the power module, not only can the electromagnetic interference when the power module is working be reduced, but the processing efficiency can also be improved.

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

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

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

[0012] In some embodiments, the power supply module further includes: a voltage regulator module and an optocoupler; a first terminal of the voltage regulator module is electrically connected to a first terminal of the first output winding; a first input terminal of the optocoupler is electrically connected to a second terminal of the voltage regulator module, a second input terminal of the optocoupler is electrically connected to a second terminal of the first output winding, and is also electrically connected to a third terminal of the voltage regulator module; a first output terminal of the optocoupler is electrically connected to a voltage feedback terminal of the microcontroller, a second output terminal of the optocoupler is electrically connected to an input terminal of the power supply module, and is also electrically connected to a ground terminal of the microcontroller.

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

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

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

[0016] In some embodiments, the transformer further includes: a plurality of third output windings; a first end and a second end of the third output windings are respectively electrically connected to the two ends of the load; 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.

[0017] In some embodiments, the transformer further includes: a plurality of third output windings, the first end and the second end of the third output windings being electrically connected to the 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 further includes a voltage conversion module, the voltage conversion module being electrically connected to one of the third output windings or the first output winding, the voltage conversion module being configured to convert the voltage output by the connected third output winding or the first output winding and output the converted voltage. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0019] Figure 1 A circuit diagram of a conventional power module provided for an embodiment of the present invention;

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

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

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

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

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

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

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

[0027] Figure 9 A simplified circuit diagram of another power module provided in an embodiment of the present invention;

[0028] Figure 10 A simplified circuit diagram of another power module provided in an embodiment of the present invention;

[0029] Figure 11 A simplified circuit diagram of another power module provided in an embodiment of the present invention;

[0030] Figure 12 A circuit diagram of a power supply module provided for an embodiment of the present invention;

[0031] Figure 13 A structural block diagram of a transformer provided in an embodiment of the present invention;

[0032] Figure 14 A structural block diagram of another transformer provided in an embodiment of the present invention;

[0033] Figure 15This is a schematic diagram of an unencapsulated power module provided in an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). 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 construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this invention have the meaning of enabling conduction. The specific meaning needs to be understood in conjunction with the context.

[0038] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] As described in the background section, with the continuous development of household appliance technology, more and more electrical appliances are entering people's daily lives and work. At the same time, due to the improvement of the level of technology in real life, people have higher demands for the intelligence of electrical appliances. Therefore, electrical appliances should also be optimized and upgraded accordingly.

[0040] Taking air conditioners as an example, the power modules on air conditioners currently do not have online upgrade capabilities, making the replacement of power modules quite cumbersome.

[0041] Meanwhile, the power module includes a microcontroller, which 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 replace; in addition, the PCB layout of the power module circuit is difficult, which reduces the processing efficiency.

[0042] Reference Figure 1 , Figure 1 This is a circuit diagram of an existing power module. The power module 10' includes: a rectifier 1', a transformer 2', an optocoupler 3', a power chip 4', and a Zener diode D'.

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

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

[0045] The existing power module layout generates electromagnetic interference, which is detrimental to the normal operation of the power module. Furthermore, the power chip transistors have different definitions, making replacement difficult.

[0046] Based on this, this application provides an air conditioner. For example... 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; 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 switching transistor 3, a microcontroller 4, and a first capacitor C1; the rectifier 1 is electrically connected to the input terminal 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 switching transistor 3 is electrically connected to the second end of the input winding Wi, and the second pole of the switching transistor 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 switching transistor 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 terminal of the power module 10 is electrically connected to the AC power supply. The AC power supply outputs an AC voltage signal and transmits it to the rectifier 1. The rectifier 1 converts the AC voltage signal into a DC voltage signal and transmits it to the input winding Wi of the transformer 2. The transformer 2 amplifies or reduces the DC voltage signal to convert it 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 to the load.

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

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

[0052] The self-excited type is a switching power supply that utilizes an intermittent oscillation circuit. It mainly consists of a power transistor and a transformer. Through self-excited oscillation, it converts DC power into a pulsed voltage on the primary side, which is then coupled to the secondary side via the transformer. After rectification by diodes and filtering by capacitors, the voltage is sent to the load circuit. Because the transformer participates in the oscillation, no additional signal source is needed; it can oscillate independently, essentially functioning as a transformer feedback oscillation circuit.

[0053] A flyback configuration refers to a flyback switching power supply, which uses a flyback high-frequency transformer to isolate the input and output circuits. Flyback switching power supplies, sometimes called flyback power supplies or ON / OFF power supplies, achieve energy transfer through the interaction of the switching transistors and secondary-side rectifier diodes. The most important characteristic of a flyback switching power supply is that the transformer winding and the connection method of the switching devices prevent the primary and secondary sides of the transformer from conducting simultaneously.

[0054] During the conduction period of the switching transistor: depending on the polarity of the transformer's corresponding terminal, the diode is cut off due to the reverse voltage. The switching current Id flows through the primary winding of the transformer and the switching transistor, storing energy in the switching transformer.

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

[0056] The term "flyback" refers to a circuit where, when the switch is on and the input is high, the inductor or capacitor connected in series in the output circuit is in a discharging state; conversely, when the switch is off and the input is high, the inductor or capacitor connected in series in the output circuit is in a charging state. Flyback designs are relatively inexpensive and can provide multiple voltage outputs.

[0057] Surge voltage is an oscillating voltage caused by the energy remaining on the primary side of the transformer during its release when the coupling between the primary and secondary sides is incomplete. The coupling characteristics of a transformer can be represented by its leakage inductance, and surge voltage is related to the magnitude of the switching current and the leakage inductance of the transformer.

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

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

[0060] The second capacitor C2 has its first terminal electrically connected to the negative terminal of the first diode D1, and its second terminal electrically connected to the second terminal of the second output winding Wo2.

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

[0062] In other words, the DC voltage signal transmitted through the input winding of transformer 2 is amplified or reduced not only 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 the operating voltage for the microcontroller 4. For example, if the operating voltage of the microcontroller 4 is 5V, and the voltage value of the DC voltage signal is 100V, the second output winding Wo2 can reduce the voltage value of the DC voltage signal from 100V to 5V, thereby powering the microcontroller 4.

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

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

[0065] Among them, the first resistor R1, the second resistor R2 and the third resistor R3 are all configured for current limiting.

[0066] For example, if the conduction voltage of switch 3 is 5V, and the output voltage of the microcontroller 4 is much greater than 5V, it will damage switch 3. In this case, the first resistor R1 is needed to limit the current so that the voltage transmitted from the output terminal OUT of the microcontroller 4 to switch 3 will not damage switch 3.

[0067] For example, the rated current range of 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 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 also includes: a third capacitor C3, a fourth capacitor C4, and a second diode D2.

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

[0070] Among them, 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 Figure 9 As shown, the power module 10 also includes a voltage regulator module 5 and an optocoupler 6.

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

[0074] An optocoupler (OC), also known as an opto-isolator, is a device that transmits electrical signals using light as a medium. It provides excellent isolation between input and output electrical signals, making it widely used in various circuits. Currently, it is one of the most diverse and widely used optoelectronic devices. An optocoupler generally consists of three parts: light emission, light reception, and signal amplification. The input electrical signal drives a light-emitting diode (LED) to emit light of a specific wavelength, which is received by a photodetector to generate a photocurrent. This photocurrent is then amplified and output. This completes the electrical-to-optical-to-electrical conversion, thus achieving input / output isolation. Due to the mutual isolation between the input and output of the optocoupler and the unidirectional nature of the electrical signal transmission, it possesses excellent electrical insulation and anti-interference capabilities. The light-emitting device is generally a light-emitting diode. There are various types of photosensitive devices, including phototransistors, photoresistors, and photothyristors, in addition to photodiodes. Optocouplers can be combined with different types of light-emitting devices and photosensitive devices to form many series of optocouplers according to different requirements.

[0075] The DC voltage signal in the power module 10 circuit is 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 large 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 outputs 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 to convert it into a suitable voltage signal, and then transmits it to the second input terminal of the optocoupler 6 via the first output winding Wo1 of the transformer 2; the optocoupler 6 then transmits the voltage signal to the voltage feedback terminal FB of the microcontroller 4 via the first output terminal.

[0077] If the voltage signal is 150V, the voltage feedback terminal FB of the microcontroller 4 will not activate and the microcontroller 4 will continue to work; if 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 Figure 10 As shown, the power module 10 also 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 optocoupler 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 optocoupler 6.

[0080] Among them, the fifth capacitor C5 and the sixth capacitor C6 are configured for filtering.

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

[0082] The first terminal of the seventh capacitor C7 is electrically connected to the first input terminal of the power module 10, and the second terminal of the seventh capacitor C7 is electrically connected to the second input terminal of the power module 10; the positive terminal of the third diode D3 is electrically connected to the first input terminal of the power module 10, the negative terminal of the third diode D3 is electrically connected to the control terminal VH of the microcontroller 4, and is also electrically connected to the second output terminal of the optocoupler 6; the positive terminal of the fourth diode D4 is electrically connected to the second input terminal of the power module 10, and the negative terminal of the fourth diode D4 is electrically connected to the negative terminal 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: X2 (X1 / X3 / MKP) capacitor for suppressing electromagnetic interference in power supply. Its main functions in circuits are: power supply line crossing circuits, electromagnetic interference filtering, and spark elimination circuits, ensuring that finished electronic products meet electromagnetic compatibility requirements.

[0084] The third diode D3 and the fourth diode D4 are configured to transmit AC voltage signals to the control terminal VH of the microcontroller 4. When the control terminal VH of the microcontroller 4 receives the AC voltage signal, it turns on the microcontroller 4, at which point the microcontroller 4 begins to operate.

[0085] like Figure 12 As shown, the power 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 terminal of the third diode D3, and the second end of the fourth resistor R4 is electrically connected to the control terminal VH of the microcontroller 4; the first end of the fifth resistor R5 is electrically connected to the negative terminal 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 terminal ACMONI of the microcontroller 4; the second end of the sixth resistor R6 is electrically connected to the second output terminal of the optocoupler 6.

[0086] The fourth resistor R4 is configured for current limiting to prevent excessive current from damaging the microcontroller 4; the fifth resistor R5 and the sixth resistor R6 are configured for voltage division. If the AC voltage signal is too large and exceeds the rated voltage range of the power module 10 circuit, the ACMONI terminal of the microcontroller 4 will control the microcontroller 4 to stop working to prevent the high 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 supply outputs an AC voltage signal and transmits the AC voltage signal to the frequency converter terminal ACMONI of the microcontroller 4.

[0088] If the AC voltage signal is 150V, the inverter terminal ACMONI of the microcontroller 4 will not operate, and the microcontroller 4 will continue to work; if the AC voltage signal is 260V, the inverter terminal 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 Figure 12 As shown, the power module 10 also includes: a fuse, a first inductor L1, a second inductor L2, and an eighth capacitor C8.

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

[0091] The fuse is configured to prevent high 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 supply generates an AC voltage signal, which is transmitted to the control terminal VH of the microcontroller 4 via the fuse, the third diode D3, and the fourth diode D4. Upon receiving the AC voltage signal, the control terminal VH of the microcontroller 4 activates the microcontroller 4, at which point it begins operation. Simultaneously, the control terminal VH of the microcontroller 4 is internally connected to its power supply terminal. When the control terminal VH receives the AC voltage signal, it also provides a brief voltage signal to the power supply terminal of the microcontroller 4, continuing until the power supply terminal receives a voltage signal from the second output winding Wo2.

[0093] During the startup process of the microcontroller 4, the inverter 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 yes, the microcontroller 4 will start working; if no, the microcontroller 4 will stop working.

[0094] An AC power source outputs an AC voltage signal and transmits it to a rectifier. The rectifier converts the AC voltage signal into a DC voltage signal and transmits it to the input winding of transformer 2. Transformer 2 amplifies or reduces the DC voltage signal, converting it into a suitable voltage signal, which is then transmitted to the load via the first output winding Wo1 of transformer 2 to provide voltage to the load. Simultaneously, the DC voltage signal transmitted via the input winding of transformer 2 is amplified or reduced not only by the first output winding Wo1 but also by the second output winding Wo2. The DC voltage converted by the second output winding Wo2 provides the operating 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 continuously receive the voltage and current from the power module 10. If the voltage or current of the power module 10 is not within the rated voltage range or rated current range, the microcontroller 4 will stop working to protect the power module 10.

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

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

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

[0099] like Figure 14 As shown, transformer 2 also includes: multiple third output windings Wo3, the first end and the second end of the third output windings 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; power module 10 also includes a voltage conversion module, which is electrically connected to a third output winding Wo3 or a first output winding Wo1, and the voltage conversion module is configured to convert the voltage output by the connected third output winding Wo3 or first output winding Wo1 and output the converted voltage.

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

[0101] In some embodiments, the power module described above may be unpotted (see reference). Figure 15 It can also be sealed.

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

Claims

1. An air conditioner, characterized in that, include: Indoor unit; The outdoor unit is electrically connected to the indoor unit; The outdoor unit includes: Power module; the power module includes: The rectifier is electrically connected to the input terminal of the power module; Transformers, including: Input winding; the first end of the input winding is electrically connected to the first output end of the rectifier; The first output winding has its first and second ends electrically connected to the two ends of the load, respectively. A switching transistor, the first terminal of which is electrically connected to the second terminal of the input winding, and the second terminal of which is electrically connected to the second output terminal of the rectifier; the transformer and the switching transistor form a flyback structure; A microcontroller, wherein the output terminal of the microcontroller is electrically connected to the control electrode of the switching transistor; A first capacitor, wherein a first terminal of the first capacitor is electrically connected to a second output terminal of the rectifier, and a second terminal of the first capacitor is electrically connected to a second terminal of the first output winding; The transformer also includes: The second output winding, the first end of which is electrically connected to the power supply terminal of the microcontroller; The power module also includes: The first diode has its positive terminal electrically connected to the first end of the second output winding, and its negative terminal electrically connected to the power supply terminal of the microcontroller. The second capacitor has its first terminal electrically connected to the negative terminal of the first diode, and its second terminal electrically connected to the second terminal of the second output winding. A voltage regulator module, wherein the first terminal of the voltage regulator module is electrically connected to the first terminal of the first output winding; An optocoupler, wherein the first input terminal of the optocoupler is electrically connected to the second terminal of the voltage regulator module, the second input terminal of the optocoupler is electrically connected to the second terminal of the first output winding, and is also electrically connected to the third terminal of the voltage regulator module; The first output terminal of the optocoupler is electrically connected to the voltage feedback terminal of the microcontroller, and the second output terminal of the optocoupler is electrically connected to the input terminal of the power module and also electrically connected to the ground terminal of the microcontroller.

2. The air conditioner according to claim 1, characterized in that, The power module also includes: A first resistor, the first end of which is electrically connected to the output terminal of the microcontroller, and the second end of which is electrically connected to the control electrode of the switching transistor; The second resistor has its first end electrically connected to the current feedback terminal of the microcontroller and its second end electrically connected to the second electrode of the switching transistor. The third resistor has its first end electrically connected to the second end of the second resistor, and its second end electrically connected to the second output terminal of the rectifier.

3. The air conditioner according to claim 2, characterized in that, The power module also includes: The third capacitor has its first terminal electrically connected to the first output terminal of the rectifier, and its second terminal electrically connected to the second output terminal of the rectifier. The fourth capacitor has its first terminal electrically connected to the first output terminal of the transformer, and its second terminal electrically connected to the second output terminal of the transformer. The second diode has its positive terminal electrically connected to the first output terminal of the transformer, and its negative terminal electrically connected to the first terminal of the fourth capacitor.

4. The air conditioner according to claim 1, characterized in that, The power module also includes: The fifth capacitor has its first terminal electrically connected to the voltage feedback terminal of the microcontroller, and its second terminal also electrically connected to the second output terminal of the optocoupler. The sixth capacitor has its first end electrically connected to the current feedback terminal of the microcontroller, and its second end electrically connected to the second output terminal of the optocoupler.

5. The air conditioner according to any one of claims 1 to 3, characterized in that, The power module includes a first input terminal and a second input terminal; the power module also includes: The seventh capacitor has its first terminal electrically connected to the first input terminal of the power module and its second terminal electrically connected to the second input terminal of the power module. The third diode has its positive terminal electrically connected to the first input terminal of the power module, its negative terminal electrically connected to the control terminal of the microcontroller, and also electrically connected to the second output terminal of the optocoupler. The fourth diode has its positive terminal electrically connected to the second input terminal of the power module, and its negative terminal electrically connected to the negative terminal of the third diode.

6. The air conditioner according to claim 5, characterized in that, The power module also includes: The fourth resistor has its first end electrically connected to the negative terminal of the third diode, and its second end electrically connected to the control terminal of the microcontroller. The fifth resistor, the first end of which is electrically connected to the negative terminal of the first diode; The sixth resistor has its first end electrically connected to the second end of the fifth resistor and also electrically connected to the frequency conversion terminal of the microcontroller. The second end of the sixth resistor is electrically connected to the second output terminal of the optocoupler.

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

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