Isolated power supply circuit and air conditioner

Abstract

The embodiment of the application discloses an isolated power supply circuit and an air conditioner, and belongs to the technical field of electronics. The circuit comprises a first driving unit, a first transformer and a rectifying unit. The first driving unit is connected with a first MCU and the first transformer respectively. The first driving unit is configured to alternately output electric energy to a first pin and a second pin of the first transformer under the action of a control signal output by the first MCU, so as to drive the first transformer to work. The third pin and the fourth pin of the first transformer are also connected with the rectifying unit. The first transformer is configured to output electric energy to the rectifying unit in the case that the first transformer receives electric energy input by the first driving unit. The rectifying unit is connected with a second MCU. The rectifying unit is configured to convert the electric energy output by the first transformer into direct current and output to the second MCU, so as to supply power to the second MCU. The application can improve the safety of power supply for a drive-by-wire controller.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and includes, but is not limited to, an isolated power supply circuit and an air conditioner. Background Technology

[0002] With the rapid development of electronic technology, various household appliances have become commonplace in people's lives, such as air conditioners, water heaters, and bathroom heaters. Furthermore, many household appliances are now equipped with corresponding wired controllers, allowing users to conveniently and quickly control them, such as central air conditioning and intelligent lighting systems.

[0003] In related technologies, taking an air conditioner with a wired controller as an example, the wired controller often needs to communicate with the indoor unit of the air conditioner to transmit corresponding control signals to the indoor unit based on the user's trigger operation of the wired controller, or to display the operating parameters of the indoor unit on the wired controller. This involves the issue of powering the wired controller. Generally, relevant technicians will lead the corresponding power supply line from the output terminal of the power module or voltage conversion module of the indoor unit to the wired controller to realize the function of the indoor unit powering the wired controller.

[0004] However, if a short circuit occurs in the wired controller or indoor unit, this technical solution could lead to various safety risks. In other words, this solution suffers from a relatively low level of safety in supplying power to the wired controller. Utility Model Content

[0005] In view of this, the isolated power supply circuit and air conditioner provided in the embodiments of this application can improve the safety of powering the wired controller. The isolated power supply circuit and air conditioner provided in the embodiments of this application are implemented as follows:

[0006] A first aspect of this application provides an isolated power supply circuit, the circuit comprising: a first driving unit, a first transformer, and a rectifier unit;

[0007] The first drive unit is connected to the first microcontroller unit (MCU) and the first transformer, respectively. The first drive unit is configured as follows:

[0008] Upon receiving the control signal output by the first MCU, the first transformer is alternately powered by the first and second pins to drive it to operate.

[0009] The third and fourth pins of the first transformer are also connected to the rectifier unit, and the first transformer is configured as follows:

[0010] When the first transformer receives electrical energy input from the first drive unit, it outputs electrical energy to the rectifier unit.

[0011] The rectifier unit is connected to the second MCU, and the rectifier unit is configured as follows:

[0012] The electrical energy output from the first transformer is converted into DC power and output to the second MCU to power the second MCU, which is the MCU in the wired controller.

[0013] Optionally, the first transformer includes a first primary winding and a second secondary winding;

[0014] The first end and the second end of the first primary winding are respectively connected to the first drive unit, and the first end and the second end of the first primary winding serve as the first pin and the second pin of the first transformer, respectively.

[0015] The first and second ends of the primary winding are respectively connected to the rectifier unit, and the first and second ends of the primary winding serve as the third and fourth pins of the first transformer, respectively.

[0016] Optionally, the first driving unit includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, and a fifth switching transistor;

[0017] The first terminal of the first switch is connected to the first MCU, the first terminal of the second switch and the first terminal of the third switch respectively, and the second terminal of the first switch is connected to the first terminal of the fourth switch and the first terminal of the fifth switch respectively.

[0018] The second end of the second switch is connected to the second end of the third switch and the first end of the first primary winding, respectively; the second end of the second switch is connected to the second end of the fourth switch.

[0019] The third terminal of the third switch is connected to the second terminal of the fifth switch;

[0020] The third terminal of the fourth switch is connected to the third terminal of the fifth switch and the second terminal of the first primary winding, respectively.

[0021] The second terminals of the first switch, the second switch, and the fourth switch are respectively used to input the first working voltage, and the third terminals of the first switch, the third switch, and the fifth switch are respectively grounded.

[0022] Optionally, the rectifier unit includes: a rectifier bridge and a capacitor;

[0023] The first end of the rectifier bridge is connected to the first end of the first primary winding, the second end of the rectifier bridge is connected to the second end of the first primary winding, the third end of the rectifier bridge is connected to the second MCU and the first plate of the capacitor respectively, and the fourth end of the rectifier bridge is connected to the second plate of the capacitor.

[0024] The first plate of the capacitor is also used to input a second working voltage, and the second plate of the capacitor is grounded.

[0025] The rectifier unit further includes: a diode;

[0026] The positive terminal of the diode is connected to the third terminal of the rectifier bridge, and the negative terminal of the diode is connected to the second MCU and the first plate of the capacitor.

[0027] Optionally, the circuit further includes a first demodulation unit;

[0028] The first demodulation unit is connected to the second MCU and the first and second ends of the first primary winding, respectively. The first demodulation unit is configured to:

[0029] The electrical energy output from the first primary winding is converted into a first digital signal, and the first digital signal is output to the second MCU, so that the second MCU receives the communication signal output by the first MCU.

[0030] Optionally, the first demodulation unit includes: a first comparator, a first resistor, and a second resistor;

[0031] The positive input terminal of the first comparator is connected to the first end of the first primary winding through the first resistor, the negative input terminal of the first comparator is connected to the second end of the first primary winding through the second resistor, and the output terminal of the first comparator is connected to the second MCU.

[0032] Optionally, the circuit further includes a second driving unit, a second transformer, and a second demodulation unit;

[0033] The second driving unit is connected to the first MCU and the first and second pins of the second transformer, respectively. The second driving unit is configured as follows:

[0034] Upon receiving the communication signal output by the second MCU, the second MCU alternately outputs electrical energy to the first or second pin of the second transformer to drive the second transformer to work.

[0035] The third and fourth pins of the second transformer are also connected to the second demodulation unit, and the second transformer is configured as follows:

[0036] When the second primary winding in the second transformer receives electrical energy input from the second drive unit, electrical energy is output to the second demodulation unit through the second secondary winding in the second transformer.

[0037] The second demodulation unit is connected to the first MCU, and the second demodulation unit is configured as follows:

[0038] The electrical energy output from the second winding is converted into a second digital signal, and the second digital signal is output to the first MCU, so that the first MCU receives the communication signal output by the second MCU.

[0039] Optionally, the second drive unit includes: a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch;

[0040] The first terminal of the sixth switch is connected to the first terminal of the second MCU, the first terminal of the seventh switch, and the first terminal of the eighth switch, respectively; the second terminal of the sixth switch is connected to the first terminal of the ninth switch and the first terminal of the tenth switch, respectively.

[0041] The second terminal of the seventh switch is connected to the second terminal of the eighth switch and the first pin of the second transformer, respectively; the second terminal of the seventh switch is connected to the second terminal of the ninth switch.

[0042] The third terminal of the eighth switch is connected to the second terminal of the tenth switch;

[0043] The third terminal of the ninth switch is connected to the third terminal of the tenth switch and the second pin of the second transformer, respectively.

[0044] The second terminals of the sixth, seventh, and ninth switches are used to input the first operating voltage, and the third terminals of the sixth, eighth, and tenth switches are grounded.

[0045] Optionally, the second demodulation unit includes: a second comparator, a third resistor, and a fourth resistor;

[0046] The positive input terminal of the second comparator is connected to the third pin of the second transformer through the third resistor, the negative input terminal of the second comparator is connected to the fourth pin of the second transformer through the fourth resistor, and the output terminal of the second comparator is connected to the first MCU.

[0047] A second aspect of this application also provides an air conditioner, the air conditioner comprising at least:

[0048] A refrigerant circulation loop includes a compressor, a condenser, and an evaporator connected in sequence, and the refrigerant circulation loop is configured to circulate refrigerant within the refrigerant circulation loop;

[0049] An indoor unit, including a first MCU, is configured to rotate to drive indoor airflow;

[0050] A wired controller, including a second MCU, is connected to the indoor unit;

[0051] And any isolated power supply circuit as provided in the first aspect above.

[0052] The isolated power supply circuit and air conditioner provided in this application embodiment are configured with a first drive unit, a first transformer, and a rectifier unit. The first drive unit is connected to a first MCU and the first transformer, respectively. The first drive unit is configured to alternately output electrical energy to the first and second pins of the first transformer under the action of a control signal received from the first MCU, thereby driving the first transformer to operate. The third and fourth pins of the first transformer are also connected to the rectifier unit. The first transformer is configured to output electrical energy to the rectifier unit when it receives electrical energy input from the first drive unit. The rectifier unit is connected to a second MCU and is configured to convert the electrical energy output from the first transformer into direct current and output it to the second MCU to power the second MCU, which is the MCU in the wired controller.

[0053] In this circuit, a first transformer is installed in the isolation power supply circuit. The first drive unit and the rectifier unit are electrically isolated through the first transformer. There is no direct wire connection between the first drive unit and the rectifier unit. Since the first MCU is connected to the first drive unit and the second MCU is connected to the rectifier unit, the first MCU and the second MCU can also be electrically isolated through the first transformer.

[0054] Furthermore, when the first MCU needs to supply power to the second MCU, the first MCU only needs to output a corresponding control signal to the first drive unit. Under the action of the corresponding control signal, the first drive unit will alternately output electrical energy to the first and second pins of the first transformer to drive the first transformer to work. Then, the third and fourth pins of the first transformer will output electrical energy to the rectifier unit, which can then convert the electrical energy output from the first transformer into DC power and output it to the second MCU. In this way, isolated power supply between the first MCU and the second MCU can be achieved.

[0055] Since the second MCU is the same MCU in the wired controller, supplying power to the wired controller via the first MCU achieves the same purpose, meaning the wired controller can be powered in an isolated manner through an isolated power supply circuit. This improves the safety of powering the wired controller, at least partially solving the technical problems mentioned in the background section. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of this application;

[0058] Figure 2 This is a schematic diagram of the structure of the first type of isolated power supply circuit provided in the embodiments of this application;

[0059] Figure 3 This is a schematic diagram of the structure of the second type of isolated power supply circuit provided in the embodiments of this application;

[0060] Figure 4 This is a schematic diagram of the structure of the third type of isolated power supply circuit provided in the embodiments of this application;

[0061] Figure 5 This is a schematic diagram of the structure of the fourth type of isolated power supply circuit provided in the embodiments of this application;

[0062] Figure 6 This is a schematic diagram of the fifth type of isolated power supply circuit provided in the embodiments of this application. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0065] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0066] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0067] In related technologies, taking an air conditioner with a wired controller as an example, the wired controller often needs to communicate with the indoor unit of the air conditioner to transmit corresponding control signals to the indoor unit based on the user's trigger operation of the wired controller, or to display the operating parameters of the indoor unit on the wired controller. This involves the issue of powering the wired controller. Generally, relevant technicians will lead the corresponding power supply line from the output terminal of the power module or voltage conversion module of the indoor unit to the wired controller to realize the function of the indoor unit powering the wired controller.

[0068] However, if a short circuit occurs in the wired controller or indoor unit, the relevant technical solution may lead to various safety risks. In other words, this solution has a relatively low safety issue in powering the wired controller. Furthermore, the relevant technical solution may also have poor anti-interference capabilities when enabling communication between the indoor unit and the wired controller.

[0069] To address this, this application provides an isolated power supply circuit, which includes a first drive unit, a first transformer, and a rectifier unit. The first drive unit is connected to both a first MCU and the first transformer. The first drive unit is configured to alternately output power to the first and second pins of the first transformer upon receiving a control signal from the first MCU 200, thereby driving the first transformer. The third and fourth pins of the first transformer are also connected to the rectifier unit. The first transformer is configured to output power to the rectifier unit when it receives power from the first drive unit. The rectifier unit is connected to a second MCU and is configured to convert the power output from the first transformer into direct current and output it to the second MCU, which is the MCU in the wired controller. This improves the safety of powering the wired controller.

[0070] This application uses an isolated power supply circuit applied in an air conditioner as an example for illustration. However, it does not imply that this application embodiment can only be applied to air conditioners to achieve isolated power supply. In practical applications, this isolated power supply circuit can be applied to any household appliance with two MCUs. For example, the household appliance may include, but is not limited to, water heaters with wired controllers, bathroom heaters with wired controllers, etc. That is, the household appliance can be any appliance with a wired controller or two MCUs, and this application embodiment does not limit this.

[0071] For example, Figure 1 This is a schematic diagram of an air conditioner provided in an embodiment of this application. See also... Figure 1 The air conditioner can be Figure 1 The air conditioner A shown may include at least one indoor unit B, at least one outdoor unit C, and at least one wired controller D. This application does not limit the scope of the embodiments described.

[0072] The indoor unit B, outdoor unit C, or wired controller D are each equipped with a corresponding processing unit (such as an MCU). By connecting each processing unit to the bus, communication between the indoor unit C, outdoor unit C, and wired controller D is achieved, thereby controlling the operation of the air conditioner.

[0073] In this embodiment, the air conditioner A may further include a refrigerant circulation loop configured to circulate refrigerant within the loop. The refrigerant circulation loop may include a compressor, a condenser, and an evaporator.

[0074] Optionally, the refrigerant circulation loop may also include a throttling device, with the compressor, condenser, throttling device, and evaporator connected in sequence in the refrigerant circulation loop. The throttling device may include, but is not limited to, an electronic expansion valve, a thermostatic expansion valve, or a float valve.

[0075] In this embodiment, the indoor unit B can supply power to the wired controller D. For example, an isolated power supply circuit as provided in this application embodiment can be set in the air conditioner, and the indoor unit B can supply power to the wired controller D through this isolated power supply circuit to achieve the purpose of isolated power supply. This application embodiment does not limit this.

[0076] It should be noted that, Figure 1 The air conditioner shown is merely an example and does not represent that the air conditioner provided in this application embodiment can only be like this. Figure 1 The structure is shown. In one possible embodiment, the air conditioner may also include a power supply unit, a display unit, a refrigeration system, a four-way valve, an axial fan, an air filter, a dust filter, and / or an electric motor, and other possible devices. This application does not limit this aspect.

[0077] The isolated power supply circuit provided in the embodiments of this application will be explained in detail below.

[0078] Figure 2 This is a schematic diagram of an isolated power supply circuit provided in this application. The isolated power supply circuit 100 can be applied to the aforementioned air conditioner A. See also... Figure 2 This application provides an isolated power supply circuit 100, which includes a first driving unit 101, a first transformer T1, and a rectifier unit 102.

[0079] The first driving unit 101 is connected to the first MCU and the first transformer T1 respectively. The first driving unit 101 is configured as follows:

[0080] Under the control signal received from the first MCU200, electrical energy is alternately output to the first and second pins of the first transformer T1 to drive the first transformer T1 to work.

[0081] The third and fourth pins of the first transformer T1 are also connected to the rectifier unit 102. The first transformer T1 is configured as follows:

[0082] When the first transformer T1 receives electrical energy input from the first drive unit 101, it outputs electrical energy to the rectifier unit 102.

[0083] The rectifier unit 102 is connected to the second MCU, and the rectifier unit 102 is configured as follows:

[0084] The electrical energy output from the first transformer T1 is converted into DC power and output to the second MCU300 to supply power to the second MCU300.

[0085] Optionally, the first transformer T1 can be an isolation device based on magnetic field coupling. That is, the first transformer T1 can be based on the principle of electromagnetic induction, interconnected through magnetic fields, and transfer energy.

[0086] In this embodiment, see continue to refer to Figure 2 The first transformer T1 includes a first primary winding Z1 and a first secondary winding Z2.

[0087] The first end and the second end of the first primary winding Z1 are respectively connected to the first drive unit 101, and the first end and the second end of the first primary winding Z1 serve as the first pin and the second pin of the first transformer T1, respectively.

[0088] The first and second ends of the primary winding Z2 are connected to the rectifier unit 102, respectively, and the first and second ends of the primary winding Z2 serve as the third and fourth pins of the first transformer T1, respectively.

[0089] In this configuration, the first primary winding Z1 and the first secondary winding Z2 are coupled through corresponding magnetic cores to improve the efficiency of electromagnetic induction and control energy loss. Alternatively, the first transformer T1 can also be an air-core transformer, meaning that the first primary winding Z1 and the first secondary winding Z2 can be directly coupled by being wound on a non-magnetic material. This application does not limit this specific configuration.

[0090] Optionally, the first MCU200 and the second MCU300 can be MCUs in any possible device or apparatus. Generally, the first MCU200 is used to supply power to the second MCU300; for example, in the case where the isolated power supply circuit 100 is applied to the air conditioner A mentioned above, the first MCU200 can be located in the indoor unit B, and the second MCU300 can be located in the wired controller D, so as to realize the purpose of indoor unit B supplying power to wired controller D.

[0091] In one possible approach, when the isolated power supply circuit 100 is applied to the aforementioned air conditioner A, the second MCU 300 can be the MCU in the wired controller, and the first MCU 200 can be the MCU in the indoor unit. Alternatively, when the isolated power supply circuit 100 is applied to any device or system with a wired controller, the second MCU 300 can generally be the MCU in the wired controller.

[0092] In this embodiment, the control signal output by the first MCU 200 can be any possible waveform signal. For example, the control signal can be a square wave signal with a frequency of 20kHz, or the frequency of the square wave signal can be 80kHz ± 20kHz. Additionally, the first MCU 200 can output the signal through a corresponding output terminal (e.g., Figure 2 The TXD1 in the middle outputs the corresponding control signal. The embodiments of this application do not limit this.

[0093] In this embodiment, the first driving unit 101 is used to drive the first transformer T1 to work. Generally, the first driving unit 101 can, under the action of a received control signal, alternately output electrical energy to the first and second terminals of the first primary winding Z1 in the first transformer T1, causing the first primary winding Z1 to generate a bidirectional alternating current. This, in turn, causes the magnetic core in the first transformer T1 to be bidirectionally magnetized and transfers energy to the first primary winding Z2. In this case, the first primary winding Z2 will generate a current with a phase opposite to that of the first primary winding Z1. Thus, the first driving unit 101 can drive the first transformer T1 to work.

[0094] Optionally, the first driving unit 101 can be a driving unit composed of multiple switching transistors. For example, the first driving unit 101 can be a push-pull circuit, an H-bridge driving circuit, or any other possible driving circuit, which can be selected according to actual needs. The switching transistor can be a MOSFET or a transistor. This application embodiment does not limit this.

[0095] Generally, when the first drive unit 101 includes multiple switching transistors, the control signal output by the first MCU 200 can be used to directly or indirectly control the switching transistors in the first drive unit 101 to turn on or off, thereby enabling the first drive unit 101 to output electrical energy to the first pin of the first transformer T1 or to the second pin of the first transformer T1. Additionally, the first drive unit 101 can also be used to input a corresponding operating voltage, thus facilitating the first drive unit 101 to output electrical energy to the first transformer T1 through each switching transistor based on the corresponding operating voltage when the corresponding switching transistor is turned on.

[0096] Optionally, the rectifier unit 102 may include any device capable of converting alternating current to direct current. For example, the rectifier unit 102 may include a rectifier bridge and / or diodes, etc., which are not limited in this embodiment.

[0097] It is worth noting that when the first driving unit 101 drives the first transformer T1 to work, since the first transformer T1 works based on the principle of electromagnetic induction, the electrical energy output by the first transformer T1 is generally alternating current (AC). However, DC power is generally required to power the second MCU 300. Therefore, the second MCU 300 is configured such that the first transformer T1, driven by the first driving unit 101, first outputs AC power to the rectifier unit 102, and then the rectifier unit 102 converts the AC power output by the first transformer T1 into DC power, and then outputs the DC power to the second MCU 300. In this way, the second MCU 300 can be powered correctly.

[0098] It should be understood that, in order to better introduce the isolated power supply circuit 100 provided in the embodiments of this application, it is assumed that the control signal output by the first MCU 200 is a square wave signal with a frequency of 20KHz. The working principle of the isolated power supply circuit 100 will be briefly introduced below:

[0099] When the first drive unit 101 does not receive the 20kHz square wave signal output by the first MCU 200, the first drive unit 101 is in a sleep state or a non-working state. At this time, the first drive unit 101 will not output power to the first transformer T1 and / or the first primary winding Z1. Therefore, the first transformer T1 is not working, and consequently, the first transformer T1 and / or the first primary winding Z2 will not output power to the rectifier unit 102. In this situation, the rectifier unit 102 will not output power to the second MCU 300; that is, the first MCU 200 does not supply power to the second MCU 300.

[0100] When the first drive unit 101 receives a 20kHz square wave signal output from the first MCU 200, the first drive unit 101 is in operation. At this time, the first drive unit 101 will perform corresponding actions according to the high and low levels of the 20kHz square wave signal, thereby alternately outputting electrical energy to the first and second pins of the first transformer T1. Because the electrical energy output by the first drive unit 101 is in opposite directions, an AC induced current will be generated at the third and fourth pins of the first transformer T1. Then, the first transformer T1 and / or the primary winding Z2 will begin to output an AC induced current to the rectifier unit 102. In this case, the rectifier unit 102 converts the AC induced current into DC current and outputs the converted DC current to the power supply terminal of the second MCU 300 (e.g., ...). Figure 2 As shown in the VCC diagram, the first MCU200 can supply power to the second MCU300.

[0101] It is worth noting that, since the isolation power supply circuit 100 is equipped with a first transformer T1, and the first drive unit 101 and the rectifier unit 102 are electrically isolated through the first transformer T1, there is no direct wire connection between the first drive unit 101 and the rectifier unit 102. Since the first MCU 200 is connected to the first drive unit 101 and the second MCU 300 is connected to the rectifier unit 102, the first MCU 200 and the second MCU 300 can also be electrically isolated through the first transformer T1.

[0102] Furthermore, when the first MCU200 needs to supply power to the second MCU300, the first MCU200 only needs to output a corresponding control signal to the first drive unit 101. Under the action of the corresponding control signal, the first drive unit 101 will alternately output electrical energy to the first and second pins of the first transformer T1 to drive the first transformer T1 to work. Then, the third and fourth pins of the first transformer T1 will output electrical energy to the rectifier unit 102, thereby enabling the rectifier unit 102 to convert the electrical energy output by the first transformer T1 into DC power and output it to the second MCU300. In this way, isolated power supply between the first MCU200 and the second MCU300 can be achieved.

[0103] In this embodiment, a first driving unit 101, a first transformer T1, and a rectifier unit 102 are provided in the isolated power supply circuit 100. The first driving unit 101 is connected to both the first MCU 200 and the first transformer T1. The first driving unit 101 is configured to alternately output electrical energy to the first and second pins of the first transformer T1 under the action of a control signal output from the first MCU 200, thereby driving the first transformer T1 to operate. The third and fourth pins of the first transformer T1 are also connected to the rectifier unit 102. The first transformer T1 is configured to output electrical energy to the rectifier unit 102 when it receives electrical energy input from the first driving unit 101. The rectifier unit 102 is connected to a second MCU 300 and is configured to convert the electrical energy output from the first transformer T1 into direct current and output it to the second MCU 300 to supply power to the second MCU 300, which is the MCU in the wired controller.

[0104] Since the isolation power supply circuit 100 is equipped with a first transformer T1, and the first drive unit 101 and the rectifier unit 102 are electrically isolated through the first transformer T1, there is no direct wire connection between the first drive unit 101 and the rectifier unit 102. Because the first MCU 200 is connected to the first drive unit 101 and the second MCU 300 is connected to the rectifier unit 102, the first MCU 200 and the second MCU 300 can also be electrically isolated through the first transformer T1.

[0105] Furthermore, when the first MCU200 needs to supply power to the second MCU300, the first MCU200 only needs to output a corresponding control signal to the first drive unit 101. Under the action of the corresponding control signal, the first drive unit 101 will alternately output electrical energy to the first and second pins of the first transformer T1 to drive the first transformer T1 to work. Then, the third and fourth pins of the first transformer T1 will output electrical energy to the rectifier unit 102, thereby enabling the rectifier unit 102 to convert the electrical energy output by the first transformer T1 into DC power and output it to the second MCU300. In this way, isolated power supply between the first MCU200 and the second MCU300 can be achieved.

[0106] Since the second MCU300 is the MCU in the wired controller, supplying power to the second MCU300 through the first MCU200 achieves the purpose of powering the wired controller. This means that the wired controller can be powered in isolation via the isolation power supply circuit 100. This improves the safety of powering the wired controller.

[0107] In one possible implementation, see [link to relevant documentation]. Figure 3 The first drive unit 101 includes: a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, and a fifth switch Q5.

[0108] The first terminal of the first switch Q1 is connected to the first MCU200, the first terminal of the second switch Q2 and the first terminal of the third switch Q3 respectively, and the second terminal of the first switch Q1 is connected to the first terminal of the fourth switch Q4 and the first terminal of the fifth switch Q5 respectively.

[0109] The second end of the second switch Q2 is connected to the second end of the third switch Q3 and the first end of the first primary winding Z1, respectively. The second end of the second switch Q2 is connected to the second end of the fourth switch Q4.

[0110] The third terminal of the third switch Q3 is connected to the second terminal of the fifth switch Q5.

[0111] The third terminal of the fourth switch Q4 is connected to the third terminal of the fifth switch Q5 and the second terminal of the first primary winding Z1, respectively.

[0112] The second terminal of the first switch Q1, the second terminal of the second switch Q2, and the second terminal of the fourth switch are used to input the first working voltage, and the third terminal of the first switch Q1, the third terminal of the third switch Q3, and the fifth switch Q5 are grounded.

[0113] Optionally, the first operating voltage can be any possible voltage, such as 5V or any other possible voltage level. See also... Figure 3 The first operating voltage can be Figure 3 VCC1 is shown. This application does not limit the scope of the embodiments.

[0114] In this embodiment, the first switch Q1 can be an NPN transistor; the second switch Q2 and the fourth switch Q4 can be N-channel switches, such as NMOS transistors or N-channel IGBT transistors; the third switch Q3 and the fifth switch Q5 can be P-channel switches, such as PMOS transistors or P-channel IGBT transistors. In practical applications, appropriate selections or adjustments can be made according to actual needs, and this embodiment does not limit this.

[0115] It should be noted that, assuming the control signal output by the first MCU200 is a square wave signal with a frequency of 20KHz, the working principle of the first driving unit 101 will be briefly introduced below:

[0116] When the first drive unit 101 receives a 20kHz square wave signal output by the first MCU 200, the first drive unit 101 is in operation. If the 20kHz square wave signal is high, then under the action of the high level, the first switch Q1 and the fourth switch Q4 are turned on, and the fifth switch Q5 is turned off. When the first switch Q1 is turned on, the second switch Q2 will be turned off and the third switch Q3 will be turned on. Then, the first operating voltage VCC1 can flow to GND1 through the fourth switch Q4, the second pin of the first transformer T1 (the second end of the first primary winding Z1), the first pin of the first transformer T1 (the first end of the first primary winding Z1), and the third switch Q3, thereby realizing the purpose of the first drive unit 101 outputting electrical energy to the first pin of the first transformer T1.

[0117] If the 20kHz square wave signal is at a low level, then under the action of the low level, the first switch Q1 and the fourth switch Q4 are turned off, and the fifth switch Q5 is turned on. When the first switch Q1 is turned off, the second switch Q2 will be turned on and the third switch Q3 will be turned off. Then, the first working voltage VCC1 can flow to GND1 through the second switch Q2, the first pin of the first transformer T1 (the first end of the first primary winding Z1), the second pin of the first transformer T1 (the second end of the first primary winding Z1), and the fifth switch Q5, so as to achieve the purpose of the first drive unit 101 outputting electrical energy to the second pin of the first transformer T1.

[0118] As can be seen from the above, under the control signal output by the first MCU200, the first drive unit 101 can alternately output electrical energy to the first pin and the second pin of the first transformer T1 to drive the first transformer T1 to work, thereby facilitating isolated power supply.

[0119] In one possible implementation, see [link to relevant documentation]. Figure 4 The rectifier unit 102 includes a rectifier bridge L and a capacitor C.

[0120] The first end of the rectifier bridge L is connected to the first end of the primary winding Z2, the second end of the rectifier bridge L is connected to the second end of the primary winding Z2, the third end of the rectifier bridge L is connected to the first plate of the second MCU300 and the capacitor C respectively, and the fourth end of the rectifier bridge L is connected to the second plate of the capacitor C.

[0121] The first plate of capacitor C is also used to input the second working voltage, and the second plate of capacitor C is grounded.

[0122] Optionally, the rectifier bridge L can be a rectifier device consisting of four rectifier diodes connected in a bridge structure. In this case, the rectifier bridge L can achieve rectification based on the unidirectional conductivity of the rectifier diodes. Generally, since the four rectifier diodes in the rectifier bridge L are arranged in a bridge structure, the input AC current is turned on through one of the two rectifier diodes and then through the load; when the direction of the input AC current changes, the other two rectifier diodes are turned on and also through the load. That is, the direction of the output current of the rectifier bridge L is always consistent, thereby achieving full-wave rectification. In addition, the rectifier bridge L can also be composed of any possible devices in any other possible way. This application does not limit this.

[0123] In this embodiment, capacitor C can be used as a filter capacitor to eliminate AC ripple that may be carried in the DC output of rectifier bridge L, and to suppress voltage fluctuations and high-frequency noise. This improves the stability of power supply to the second MCU300.

[0124] In one possible implementation, see [link to previous section] Figure 4 The rectifier unit 102 also includes a diode D.

[0125] The positive terminal of diode D is connected to the third terminal of rectifier bridge L, and the negative terminal of diode D is connected to the first plate of the second MCU300 and capacitor C respectively.

[0126] It is worth noting that, due to the unidirectional conduction characteristic of diode D, the DC output from rectifier bridge L can only flow from the positive terminal to the negative terminal of diode D, and then be output to the second MCU300 and capacitor C. However, during the operation of rectifier unit 102, capacitor C stores a certain amount of electrical energy. When rectifier bridge L stops outputting DC, capacitor C may release the stored electrical energy. If diode D is not provided, the released electrical energy from capacitor C will flow back into rectifier bridge L. Therefore, by providing diode D, it is possible to prevent the electrical energy output from capacitor C from flowing back into rectifier bridge L as much as possible, thereby avoiding the impact of large reverse currents on the rectifier diodes in the rectifier bridge and preventing the ineffective loss of energy from capacitor C. In addition, diode D can also suppress power spikes.

[0127] In one possible implementation, see [link to relevant documentation]. Figure 5 The circuit 100 also includes a first demodulation unit 103.

[0128] The first demodulation unit 103 is connected to the second MCU 300 and the first and second ends of the first primary winding Z2, respectively.

[0129] The first demodulation unit 103 is configured to convert the electrical energy output from the primary winding Z2 into a first digital signal and output the first digital signal to the second MCU 300, so that the second MCU 300 receives the communication signal output by the first MCU 200.

[0130] Optionally, the first demodulation unit 103 can be any device capable of converting analog signals transmitted from an analog communication line into digital signals. This application does not limit this.

[0131] In this embodiment, generally, the communication signal output by the first MCU 200 can achieve the same function as the control signal output by the first MCU 200. For example, the communication signal output by the first MCU 200 can be a square wave signal with a frequency of 80KHz±20KHz, that is, the communication signal output by the first MCU 200 can be a 60KHz square wave signal or a 100KHz square wave signal.

[0132] In other words, the communication signal output by the first MCU200 can also be used to control the first drive unit 101 to drive the first transformer T1 to work, so as to realize the purpose of the first MCU200 to supply power to the second MCU300.

[0133] It is worth noting that since the first primary winding Z2 outputs electrical energy based on the electromagnetic induction of the first primary winding Z1, the electrical energy output by the first primary winding Z2 is an analog signal. However, the second MCU300 can generally only recognize digital signals. Therefore, after the first demodulation unit 103 converts the electrical energy output by the first primary winding Z2 into a first digital signal, it can ensure that the second MCU300 can correctly receive and recognize the communication signal output by the first MCU200.

[0134] Furthermore, based on the above embodiments, this application also provides a possible example: Generally, if the first MCU 200 outputs a 20kHz square wave signal, it indicates that the first MCU 200 only supplies power to the second MCU 300, and there is no need for communication between the first MCU 200 and the second MCU 300. If the first MCU 200 outputs an 80±20kHz square wave signal, it indicates that the first MCU 200 not only supplies power to the second MCU 300, but also communicates with the second MCU 300. This application does not limit this aspect.

[0135] In one possible implementation, see [link to previous section] Figure 5 The first demodulation unit 103 includes: a first comparator N1, a first resistor R1, and a second resistor R2.

[0136] The positive input terminal of the first comparator N1 is connected to the first terminal of the first primary winding Z2 through the first resistor R1, and the negative input terminal of the first comparator N1 is connected to the second terminal of the first primary winding Z2 through the second resistor R2. The output terminal of the first comparator N1 is connected to the second MCU300.

[0137] In this embodiment, the first resistor R1 and the second resistor R2 can be used as configuration resistors for the first comparator N1. The first resistor R1 and the second resistor R2 can be used to improve circuit stability and protect the input terminal of the first comparator N1. The resistance values ​​of the first resistor R1 and the second resistor R2 can be set according to actual needs. This application embodiment does not limit this.

[0138] For example, taking the communication signal output by the first MCU 200 as an 80±20KHz square wave signal, under the action of this communication signal, the first driving unit 101, the first transformer T1, and the rectifier unit 102 normally enter the working state. The specific working principle of this part can be found in the relevant description of the above embodiment, and will not be repeated here. In the first transformer T1, the first winding Z2 will also output corresponding electrical energy at a frequency of 80±20KHz under the action of electromagnetic induction. When the first winding Z2 outputs the corresponding electrical energy to the positive and negative input terminals of the first comparator N1 through the first resistor R1 and the second resistor R2, the first comparator N1 will compare the signals input to the two input terminals, and then send the comparison result to the receiving terminal of the second MCU 300 (e.g., Figure 5 The RXD2) outputs the first digital signal. The first digital signal can indicate the frequency of the communication signal output by the first MCU200. For example, if the communication signal output by the first MCU200 is 60KHz, then the first digital signal can indicate 60KHz.

[0139] For example, if the second MCU 300 receives a first digital signal indicating 60kHz, then the second MCU 300 can determine that the current logic is "0"; if the second MCU 300 receives a first digital signal indicating 100kHz, then the second MCU 300 can determine that the current logic is "1". In this way, the purpose of enabling the second MCU 300 to receive the communication signal output by the first MCU 200 can be achieved.

[0140] Furthermore, in this application, the first drive unit 101 can convert the control signal and / or communication signal output by the first MCU 200 into a complementary differential voltage. The first primary winding Z1 of the first transformer T1 generates an alternating magnetic field. The first secondary winding Z2 of the first transformer T1 can induce a signal with the same phase difference. Moreover, the first digital signal is output to the second MCU 300 through the first secondary winding Z2 and the first comparator N1 to realize the communication between the first MCU 200 and the second MCU 300.

[0141] In other words, in this application, the first MCU 200 can transmit signals via the connection between the first and second ends of the first primary winding Z1, and the second MCU 300 can receive signals via the connection between the first and second ends of the first primary winding Z2. Although there is only a single-wire connection between the first comparator N1 and the second MCU 300, the first comparator N1 can compare the voltage difference between the two input terminals and output a corresponding first digital signal based on the comparison result. Therefore, differential communication between the first MCU 200 and the second MCU 300 can be achieved through the first primary winding Z1, the first primary winding Z2, and the first comparator N1, thereby improving common-mode rejection capability and effectively enhancing anti-interference capability during communication.

[0142] In one possible implementation, see [link to relevant documentation]. Figure 6 The circuit 100 also includes a second drive unit 104, a second transformer T2, and a second demodulation unit 105.

[0143] The second driving unit 104 is connected to the first MCU 200 and the first and second pins of the second transformer T2, respectively. The second driving unit 104 is configured as follows:

[0144] Upon receiving the communication signal output from the second MCU300, the second transformer T2 is alternately powered by either the first or second pin to drive it.

[0145] The third and fourth pins of the second transformer T2 are also connected to the second demodulation unit 105. The second transformer T2 is configured as follows:

[0146] When the second primary winding Z3 in the second transformer T2 receives electrical energy input from the second drive unit 104, it outputs electrical energy to the second demodulation unit 105 through the second secondary winding Z4 in the second transformer T2.

[0147] The second demodulation unit 105 is connected to the first MCU 200, and the second demodulation unit 105 is configured as follows:

[0148] The electrical energy output from the secondary winding Z4 is converted into a second digital signal, and the second digital signal is output to the first MCU200, so that the first MCU200 can receive the communication signal output by the second MCU300.

[0149] Optionally, the second transformer T2 can be an isolation device based on magnetic field coupling. That is, the second transformer T2 can be based on the principle of electromagnetic induction, interconnected through magnetic fields, and transfer energy.

[0150] In this embodiment, see continue to refer to Figure 6The second transformer T2 includes a second primary winding Z3 and a second secondary winding Z4, and the circuit 100 also includes a resistor R0.

[0151] The first and second ends of the second primary winding Z3 are respectively connected to the second drive unit 104, and the first and second ends of the second primary winding Z3 serve as the first and second pins of the second transformer T2, respectively.

[0152] The first and second ends of the second stage winding Z4 are connected to the resistor R0 and the second demodulation unit 105, respectively. The first and second ends of the second stage winding Z4 serve as the third and fourth pins of the second transformer T2, respectively.

[0153] Optionally, the resistor R0 can be a load resistor of any value, and this application embodiment does not limit this.

[0154] In this configuration, the second primary winding Z3 and the second secondary winding Z4 are coupled through corresponding magnetic cores to improve the efficiency of electromagnetic induction and control energy loss. Alternatively, the second transformer T2 can also be an air-core transformer, meaning that the second primary winding Z3 and the second secondary winding Z4 can be directly coupled by being wound on a non-magnetic material. This application does not limit this specific configuration.

[0155] In this embodiment, the communication signal output by the second MCU 300 can be any possible waveform signal, such as a square wave signal, and the frequency of the square wave signal can be 80KHz±20KHz. Additionally, the second MCU 300 can output signals through corresponding output terminals (e.g., Figure 6 The TXD2 in the middle outputs the corresponding communication signal. This application does not limit this.

[0156] In this embodiment, the second driving unit 104 is used to drive the second transformer T2. Generally, the second driving unit 104 can alternately output electrical energy to the first and second terminals of the second primary winding Z3 in the second transformer T2 under the influence of received communication signals. This causes the second primary winding Z3 to generate a bidirectional alternating current, thereby bidirectionally magnetizing the core of the second transformer T2 and transferring energy to the secondary winding Z4. In this case, the secondary winding Z4 will generate a current with a phase opposite to that of the second primary winding Z3. Thus, the second driving unit 104 can drive the second transformer T2 to operate.

[0157] Generally, the structure of the second driving unit 104 can be the same as that of the first driving unit 101. The specific working principle can be referred to the description of the first driving unit 101 above. This application embodiment will not repeat the details.

[0158] Optionally, the second demodulation unit 105 can also be any device capable of converting analog signals transmitted from an analog communication line into digital signals. This application does not limit this.

[0159] In other words, the communication signal output by the second MCU 300 can also be used to control the second drive unit 104 to drive the second transformer T2 to work, so as to transmit the communication signal output by the second MCU 300 to the receiving end of the second demodulation unit 105 and the first MCU 200 through the second transformer T2 (specifically, it can be...). Figure 6 The purpose of RXD1 shown.

[0160] It is worth noting that since the secondary winding Z4 outputs electrical energy based on the electromagnetic induction of the secondary primary winding Z3, the electrical energy output by the secondary winding Z4 is an analog signal. However, the first MCU 200 can generally only recognize digital signals. Therefore, after the second demodulation unit 105 converts the electrical energy output by the secondary winding Z4 into a second digital signal, it can be ensured that the first MCU 200 can correctly receive and recognize the communication signal output by the second MCU 300. In this way, communication between the second MCU 300 and the first MCU 200 can be achieved based on the second drive unit 104, the second transformer T2, and the second demodulation unit 105.

[0161] Generally, if the second MCU 300 outputs an 80±20KHz square wave signal to the first MCU 200, it indicates that the second MCU 300 needs to send a signal to the first MCU 200 to achieve communication between the two MCUs. This application embodiment does not limit this.

[0162] In one possible implementation, see [link to previous section] Figure 6 The second drive unit 104 includes: a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a ninth switch Q9, and a tenth switch Q10.

[0163] The first terminal of the sixth switch Q6 is connected to the first terminal of the second MCU300, the first terminal of the seventh switch Q7 and the first terminal of the eighth switch Q8, respectively. The second terminal of the sixth switch Q6 is connected to the first terminal of the ninth switch Q9 and the first terminal of the tenth switch Q10, respectively.

[0164] The second terminal of the seventh switch Q7 is connected to the second terminal of the eighth switch Q8 and the first pin of the second transformer T2, respectively. The second terminal of the seventh switch Q7 is connected to the second terminal of the ninth switch Q9.

[0165] The third terminal of the eighth switch Q8 is connected to the second terminal of the tenth switch Q10.

[0166] The third terminal of the ninth switch Q9 is connected to the third terminal of the tenth switch Q10 and the second pin of the second transformer T2.

[0167] Among them, the second terminal of the sixth switch Q6, the second terminal of the seventh switch Q7 and the second terminal of the ninth switch are used to input the first working voltage, and the third terminal of the sixth switch Q6, the third terminal of the eighth switch Q8 and the tenth switch Q10 are grounded.

[0168] Optionally, the second operating voltage can be any possible voltage, such as 3.3V or any other possible voltage level. See also... Figure 6 The first operating voltage can be Figure 6 VCC2 is shown. This application does not limit the scope of the embodiments.

[0169] In this embodiment, the sixth switch Q6 can be an NPN transistor; the seventh switch Q7 and the ninth switch Q9 can be N-channel switches, such as NMOS transistors or N-channel IGBT transistors; the eighth switch Q8 and the tenth switch Q10 can be P-channel switches, such as PMOS transistors or P-channel IGBT transistors. In practical applications, appropriate selections or adjustments can be made according to actual needs, and this embodiment does not limit this.

[0170] It should be noted that, assuming the communication signal output by the second MCU300 is a square wave signal, the working principle of the second drive unit 104 will be briefly introduced below:

[0171] When the second drive unit 104 receives the square wave signal output by the first MCU 200, the second drive unit 104 is in working state. If the square wave signal is high level, then under the action of the high level, the fifth switch Q5 and the seventh switch Q7 are turned on and the eighth switch Q8 is turned off. When the fifth switch Q5 is turned on, the tenth switch Q10 will be turned on and the ninth switch Q9 will be turned off. Then, the second working voltage VCC2 can flow to GND2 through the seventh switch Q7, the first pin of the second transformer T2 (the first end of the second primary winding Z3), the second pin of the second transformer T2 (the second end of the second primary winding Z3), and the tenth switch Q10, so as to realize the purpose of the second drive unit 104 to output electrical energy to the first pin of the second transformer T2.

[0172] If the square wave signal is low, then under the action of the low level, the fifth switch Q5 and the seventh switch Q7 are turned off, and the eighth switch Q8 is turned on. When the fifth switch Q5 is turned off, the ninth switch Q9 will be turned on and the tenth switch Q10 will be turned off. Then, the second working voltage VCC2 can flow to GND2 through the ninth switch Q9, the second pin of the second transformer T2 (the second end of the second primary winding Z3), the first pin of the second transformer T2 (the first end of the second primary winding Z3), and the eighth switch Q8, so as to realize the purpose of the second drive unit 104 to output electrical energy to the second pin of the second transformer T2.

[0173] As can be seen from the above, under the action of the communication signal output by the second MCU300, the second driving unit 104 can alternately output electrical energy to the first pin and the second pin of the second transformer T2 to drive the second transformer T2 to work, thereby facilitating the transmission of the communication signal output by the second MCU300 to the first MCU200.

[0174] In one possible implementation, see [link to previous section] Figure 6 The second demodulation unit 105 includes: a second comparator N2, a third resistor R3, and a fourth resistor R4.

[0175] The positive input terminal of the second comparator N2 is connected to the third pin of the second transformer T2 through the third resistor R3, the negative input terminal of the second comparator N2 is connected to the fourth pin of the second transformer T2 through the fourth resistor R4, and the output terminal of the second comparator N2 is connected to the first MCU200.

[0176] In this embodiment, the third resistor R3 and the fourth resistor R4 can be used as configuration resistors for the second comparator N2. The third resistor R3 and the fourth resistor R4 can be used to improve circuit stability and protect the input terminals of the second comparator N2. The resistance values ​​of the third resistor R3 and the fourth resistor R4 can be set according to actual needs. This embodiment does not limit this.

[0177] For example, taking the communication signal output by the second MCU300 as an 80±20KHz square wave signal, under the action of this communication signal, the second drive unit 104 and the second transformer T2 normally enter the working state. The specific working principle of this part can be found in the relevant description of the above embodiment, and will not be repeated here. Moreover, under the action of electromagnetic induction, the second secondary winding Z4 in the second transformer T2 will also output corresponding electrical energy at a frequency of 80±20KHz. When the second secondary winding Z4 outputs the corresponding electrical energy to the positive and negative input terminals of the second comparator N2 through the third resistor R3 and the fourth resistor R4, the second comparator N2 will compare the signals input to the two input terminals, and then send the comparison result to the receiving terminal of the first MCU200 (e.g., Figure 6 The second digital signal is output by RXD1 in the second MCU 300. This second digital signal can indicate the frequency of the communication signal output by the second MCU 300. For example, if the communication signal output by the second MCU 300 is 60KHz, then the second digital signal can indicate 60KHz.

[0178] For example, if the first MCU 200 receives a second digital signal indicating 60kHz, then the first MCU 200 can determine that the current logic is "0"; if the first MCU 200 receives a second digital signal indicating 100kHz, then the first MCU 200 can determine that the current logic is "1". In this way, the purpose of enabling the first MCU 200 to receive the communication signal output by the second MCU 300 can be achieved.

[0179] Furthermore, in this application, the second drive unit 104 can convert the control signal and / or communication signal output by the second MCU 300 into a complementary differential voltage. The second primary winding Z3 of the second transformer T2 generates an alternating magnetic field. The second secondary winding Z4 of the second transformer T2 can induce a signal with the same phase difference. Moreover, the second digital signal is output to the first MCU 200 through the second secondary winding Z4 and the second comparator N2 to realize the communication between the second MCU 300 and the first MCU 200.

[0180] In other words, in this application, the second MCU 300 can transmit signals via the connection between the first and second ends of the second primary winding Z3, and the first MCU 200 can receive signals via the connection between the first and second ends of the second secondary winding Z4. Although there is only a single-wire connection between the second comparator N2 and the first MCU 200, the second comparator N2 can compare the voltage difference between the two input terminals and output a corresponding second digital signal based on the comparison result. Therefore, differential communication between the second MCU 300 and the first MCU 200 can be achieved through the second primary winding Z3, the second secondary winding Z4, and the second comparator N2, thereby improving common-mode rejection capability and effectively enhancing anti-interference capability during communication.

[0181] As can be seen, when the isolation power supply circuit 100 provided in this application embodiment is applied to an air conditioner, it can not only achieve the purpose of isolating power supply for the wired controller, but also realize differential communication between the MCU of the wired controller and the MCU of the indoor unit.

[0182] Based on the foregoing embodiments, this application also provides an air conditioner, the structure of which can be as follows: Figure 1 As shown.

[0183] In one possible embodiment, the air conditioner may also include:

[0184] A refrigerant circulation loop, comprising a compressor, a condenser, and an evaporator connected in sequence, is configured to circulate refrigerant within the refrigerant circulation loop.

[0185] The indoor unit includes a first MCU, which is configured to rotate to drive indoor airflow.

[0186] The wired controller includes a second MCU, which is connected to the indoor unit.

[0187] And the isolated power supply circuit 100 provided in any of the above embodiments.

[0188] The isolation power supply circuit 100 is connected to the first MCU and the second MCU respectively, so that the first MCU can supply power to the second MCU through the isolation power supply circuit 100.

[0189] In one possible approach, if the isolation power supply circuit 100 includes a first demodulation unit, the second MCU can also receive the communication signal output by the first MCU through the isolation power supply circuit 100.

[0190] In one possible approach, if the isolation power supply circuit 100 includes a second drive unit, a second transformer, and a second demodulation unit, the first MCU can also receive the communication signal output by the second MCU through the isolation power supply circuit 100.

[0191] In this way, differential communication between the first MCU and the second MCU can be achieved.

[0192] Those skilled in the art will understand that Figure 1 The structure shown is merely a block diagram of a portion of the air conditioner's structure and does not constitute a limitation on the air conditioner to which the solution of this application is applied. A specific air conditioner may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0193] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0194] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0195] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0196] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0197] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0198] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An isolated power supply circuit, characterized in that, The circuit includes: a first driving unit, a first transformer, and a rectifier unit; The first drive unit is connected to the first MCU and the first transformer respectively, and the first drive unit is configured as follows: Upon receiving the control signal output by the first MCU, the first transformer is alternately powered by the first and second pins to drive it to operate. The third and fourth pins of the first transformer are also connected to the rectifier unit, and the first transformer is configured as follows: When the first transformer receives electrical energy input from the first drive unit, it outputs electrical energy to the rectifier unit. The rectifier unit is connected to the second MCU, and the rectifier unit is configured as follows: The electrical energy output from the first transformer is converted into DC power and output to the second MCU to power the second MCU, which is the MCU in the wired controller.

2. The isolated power supply circuit as described in claim 1, characterized in that, The first transformer includes a first primary winding and a second secondary winding; The first end and the second end of the first primary winding are respectively connected to the first drive unit, and the first end and the second end of the first primary winding serve as the first pin and the second pin of the first transformer, respectively. The first and second ends of the primary winding are respectively connected to the rectifier unit, and the first and second ends of the primary winding serve as the third and fourth pins of the first transformer, respectively.

3. The isolated power supply circuit as described in claim 2, characterized in that, The first driving unit includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, and a fifth switching transistor; The first terminal of the first switch is connected to the first MCU, the first terminal of the second switch and the first terminal of the third switch respectively, and the second terminal of the first switch is connected to the first terminal of the fourth switch and the first terminal of the fifth switch respectively. The second end of the second switch is connected to the second end of the third switch and the first end of the first primary winding, respectively; the second end of the second switch is connected to the second end of the fourth switch. The third terminal of the third switch is connected to the second terminal of the fifth switch; The third terminal of the fourth switch is connected to the third terminal of the fifth switch and the second terminal of the first primary winding, respectively. The second terminals of the first switch, the second switch, and the fourth switch are respectively used to input the first working voltage, and the third terminals of the first switch, the third switch, and the fifth switch are respectively grounded.

4. The isolated power supply circuit as described in claim 2, characterized in that, The rectifier unit includes: a rectifier bridge and a capacitor; The first end of the rectifier bridge is connected to the first end of the first primary winding, the second end of the rectifier bridge is connected to the second end of the first primary winding, the third end of the rectifier bridge is connected to the second MCU and the first plate of the capacitor respectively, and the fourth end of the rectifier bridge is connected to the second plate of the capacitor. The first plate of the capacitor is also used to input a second working voltage, and the second plate of the capacitor is grounded. The rectifier unit further includes: a diode; The positive terminal of the diode is connected to the third terminal of the rectifier bridge, and the negative terminal of the diode is connected to the second MCU and the first plate of the capacitor.

5. The isolated power supply circuit as described in any one of claims 1-4, characterized in that, The circuit also includes a first demodulation unit; The first demodulation unit is connected to the second MCU and the first and second terminals of the primary winding in the first transformer, respectively. The first demodulation unit is configured to: The electrical energy output from the first primary winding is converted into a first digital signal, and the first digital signal is output to the second MCU, so that the second MCU receives the communication signal output by the first MCU.

6. The isolated power supply circuit as described in claim 5, characterized in that, The first demodulation unit includes: a first comparator, a first resistor, and a second resistor; The positive input terminal of the first comparator is connected to the first end of the first primary winding through the first resistor, the negative input terminal of the first comparator is connected to the second end of the first primary winding through the second resistor, and the output terminal of the first comparator is connected to the second MCU.

7. The isolated power supply circuit as described in any one of claims 1-4, characterized in that, The circuit also includes a second drive unit, a second transformer, and a second demodulation unit; The second driving unit is connected to the first MCU and the first and second pins of the second transformer, respectively. The second driving unit is configured as follows: Upon receiving the communication signal output by the second MCU, the second MCU alternately outputs electrical energy to the first or second pin of the second transformer to drive the second transformer to work. The third and fourth pins of the second transformer are also connected to the second demodulation unit, and the second transformer is configured as follows: When the second primary winding in the second transformer receives electrical energy input from the second drive unit, electrical energy is output to the second demodulation unit through the second secondary winding in the second transformer. The second demodulation unit is connected to the first MCU, and the second demodulation unit is configured as follows: The electrical energy output from the second winding is converted into a second digital signal, and the second digital signal is output to the first MCU, so that the first MCU receives the communication signal output by the second MCU.

8. The isolated power supply circuit as described in claim 7, characterized in that, The second drive unit includes: a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch; The first terminal of the sixth switch is connected to the first terminal of the second MCU, the first terminal of the seventh switch, and the first terminal of the eighth switch, respectively; the second terminal of the sixth switch is connected to the first terminal of the ninth switch and the first terminal of the tenth switch, respectively. The second terminal of the seventh switch is connected to the second terminal of the eighth switch and the first pin of the second transformer, respectively; the second terminal of the seventh switch is connected to the second terminal of the ninth switch. The third terminal of the eighth switch is connected to the second terminal of the tenth switch; The third terminal of the ninth switch is connected to the third terminal of the tenth switch and the second pin of the second transformer, respectively. The second terminals of the sixth, seventh, and ninth switches are used to input the first operating voltage, and the third terminals of the sixth, eighth, and tenth switches are grounded.

9. The isolated power supply circuit as described in claim 7, characterized in that, The second demodulation unit includes: a second comparator, a third resistor, and a fourth resistor; The positive input terminal of the second comparator is connected to the third pin of the second transformer through the third resistor, the negative input terminal of the second comparator is connected to the fourth pin of the second transformer through the fourth resistor, and the output terminal of the second comparator is connected to the first MCU.

10. An air conditioner, characterized in that, The air conditioner includes at least: A refrigerant circulation loop includes a compressor, a condenser, and an evaporator connected in sequence, and the refrigerant circulation loop is configured to circulate refrigerant within the refrigerant circulation loop; An indoor unit, including a first MCU, is configured to rotate to drive indoor airflow; A wired controller, including a second MCU, is connected to the indoor unit; And, the isolated power supply circuit as described in any one of claims 1-9 above.

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