Carrier communication circuit and air conditioner

Abstract

The application discloses a carrier communication circuit and an air conditioner. The carrier communication circuit is applied to the air conditioner. The air conditioner comprises a host and a slave. The carrier communication circuit comprises a carrier modulation module and a carrier excitation module. The carrier modulation module is arranged on the host side and is used for modulating and processing input modulation signals and carrier signals to output excitation signals. The carrier excitation module is arranged on the host side and is connected with the carrier modulation module. The carrier excitation module is used for being connected with a direct current bus and performing excitation processing on direct current voltage input by the direct current bus according to the excitation signals, and then outputting the direct current bus to the slave. The application effectively alleviates the problem that the current carrier communication circuit structure is complex, which leads to large equipment volume and is not conducive to the miniaturization and light weight requirements.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a carrier communication circuit and an air conditioner. Background Technology

[0002] In the field of low-voltage direct current (LVDC) bus communication, power line communication (PLC) technology, as a solution for data transmission using existing power lines, has been widely applied in smart grids, distributed energy systems, and electric vehicle charging networks. This technology multiplexes power transmission and data communication by superimposing high-frequency modulated signals onto DC or AC power lines, thereby avoiding the deployment of additional communication lines and significantly reducing system complexity and construction costs.

[0003] However, in the current practical application of PLC technology in LVDC bus communication, PLC systems usually require complex hardware architectures, resulting in large equipment size and low integration, which makes it difficult to meet the miniaturization and lightweight requirements of modern power electronic equipment. Utility Model Content

[0004] The present application provides a carrier communication circuit and an air conditioner that can effectively alleviate the problem that the current carrier communication circuit has a complex structure, resulting in a large device size that is not conducive to miniaturization and lightweighting.

[0005] This application provides a carrier communication circuit applied to an air conditioner, which includes a main unit and a slave unit. The carrier communication circuit includes:

[0006] The carrier modulation module is located on the host side. The carrier modulation module is used to modulate the input modulation signal and carrier signal and output the excitation signal.

[0007] The carrier excitation module is located on the host side and is connected to the carrier modulation module. The carrier excitation module is used to connect to the DC bus and, based on the excitation signal, processes the DC voltage input to the DC bus and outputs it to the slave device.

[0008] In some embodiments of the carrier communication circuit, the carrier communication circuit further includes a boost suppression module, which is connected to the carrier excitation module and is used to suppress the DC voltage of the DC bus.

[0009] In some embodiments of the carrier communication circuit, the carrier communication circuit further includes an interference suppression module, which is connected to the carrier excitation module and is used to suppress electromagnetic interference on the DC bus.

[0010] In some embodiments of the carrier communication circuit, the carrier modulation module includes a first resistor, a second resistor, and a first diode. One end of the first resistor and one end of the second resistor are both used to receive the modulation signal. The other end of the first resistor is energized, and the other end of the second resistor is connected to the carrier excitation module. The positive terminal of the first diode is used to receive the carrier signal, and the negative terminal of the first diode is connected to the carrier excitation module.

[0011] In some embodiments of the carrier communication circuit, the carrier excitation module includes a third resistor, a fourth resistor, a fifth resistor, a first inductor, and a switching transistor. One end of the third resistor is connected to the other end of the second resistor and the cathode of the first diode. The other end of the third resistor and one end of the fourth resistor are both connected to the first end of the switching transistor. The other end of the fourth resistor is grounded, and the second end of the switching transistor is grounded. The third end of the switching transistor is connected to one end of the first inductor through the fifth resistor. The other end of the first inductor is used to connect to the DC bus, and one end of the first inductor is also connected to the DC bus.

[0012] In some embodiments of the carrier communication circuit, the boost suppression module includes a second diode, the anode of which is connected to one end of the first inductor, and the cathode of which is connected to the other end of the first inductor.

[0013] In some embodiments of the carrier communication circuit, the interference suppression module includes a first capacitor and a sixth resistor. One end of the first capacitor is connected to the other end of the first inductor, and the other end of the first capacitor is connected to one end of the first inductor through the sixth resistor.

[0014] In some embodiments of the carrier communication circuit, the carrier communication circuit further includes a rectifier bridge, which is disposed on the slave side. The first pin of the rectifier bridge is grounded, the second pin of the rectifier bridge is connected to the DC bus, the third pin of the rectifier bridge is connected to the electrical load on the slave side, and the fourth pin of the rectifier bridge is connected to the DC bus.

[0015] In some embodiments of the carrier communication circuit, the carrier communication circuit also includes a filtering module, which is located on the slave side and connected to pin 3 of the rectifier bridge. The filtering module is used to filter the electrical signal input through the rectifier bridge.

[0016] This application also provides an air conditioner, which includes the aforementioned carrier communication circuit.

[0017] This application provides a carrier communication circuit and an air conditioner. The carrier communication circuit can excite the DC bus by setting a carrier modulation module and a carrier excitation module, so that the corresponding DC bus is used as a communication line and a power supply line. While realizing the communication connection between the master and slave units, it can also provide power to the slave unit. The circuit structure is simple. Applying this carrier communication circuit to the air conditioner is conducive to the miniaturization and weight reduction of the air conditioner. Attached Figure Description

[0018] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0019] Figure 1 This is a first structural block diagram of a carrier communication circuit provided in an embodiment of this application.

[0020] Figure 2 This is a second structural block diagram of the carrier communication circuit provided in an embodiment of this application.

[0021] Figure 3 The circuit structure diagram of the carrier communication circuit provided in the embodiment of this application is shown. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Furthermore, 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. Features thus defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Please see Figure 1 This embodiment provides a carrier communication circuit, which is applied in an air conditioner. The air conditioner includes a main unit 10 and a slave unit 20. The carrier communication circuit can be used for communication connection between the main unit 10 and the slave unit 20 and for power supply to the slave unit 20.

[0025] Specifically, the carrier communication circuit includes a carrier modulation module 11 and a carrier excitation module 12. Both the carrier modulation module 11 and the carrier excitation module 12 are located on the host 10 side. The carrier modulation module 11 is connected to the carrier excitation module 12. The carrier modulation module 11 is used to modulate the input modulation signal (such as a TX signal) and the carrier signal (such as a PWM signal) and output an excitation signal. The carrier excitation module 12 is used to connect to the DC bus 30 and, according to the excitation signal, excites the DC voltage input to the DC bus 30 and outputs the DC bus 30 to the slave 20. In this application, by setting the carrier modulation module 11 and the carrier excitation module 12, the DC bus 30 can be excited, so that the corresponding DC bus 30 is used as both a communication line and a power supply line. While realizing the communication connection between the host 10 and the slave 20, it can also provide power to the slave 20. The circuit structure is simple, and applying this carrier communication circuit to an air conditioner is beneficial to the miniaturization and weight reduction requirements of the air conditioner.

[0026] Please see Figure 2 In some embodiments, the carrier communication circuit further includes a boost suppression module 13, which is connected to the carrier excitation module 12. The boost suppression module 13 is used to suppress the DC voltage of the DC bus 30 and prevent the DC voltage of the DC bus 30 from increasing due to the connection of the carrier excitation module 12 to the DC bus 30.

[0027] In some embodiments, the carrier communication circuit further includes an interference suppression module 14, which is connected to the carrier excitation module 12. The interference suppression module 14 is used to suppress electromagnetic interference on the DC bus 30, which helps to improve the stability and reliability of the carrier communication circuit.

[0028] Please see Figure 3 In one embodiment, the carrier modulation module 11 includes a first resistor R1, a second resistor R2, and a first diode D1. One end of the first resistor R1 and one end of the second resistor R2 are both used to receive the modulation signal. The other end of the first resistor R1 is energized, and the other end of the second resistor R2 is connected to the carrier excitation module 12. The anode of the first diode D1 is used to receive the carrier signal, and the cathode of the first diode D1 is connected to the carrier excitation module 12. In this embodiment, the TX signal is used as the modulation signal, and the PWM signal is used as the carrier signal. The excitation signal is generated after the PWM signal and the TX signal are modulated. As shown in Table 1, when the TX signal is low, the carrier modulation module 11 outputs an effective excitation signal to drive the carrier excitation module 12 to work.

[0029] 1 PWM 1 Deadline invalid 0 PWM PWM Follow the PWM alternating conduction efficient

[0030] Table 1

[0031] As one embodiment, the carrier excitation module 12 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first inductor L1, and a switching transistor Q1. One end of the third resistor R3 is connected to the other end of the second resistor R2 and the cathode of the first diode D1. The other end of the third resistor R3 and one end of the fourth resistor R4 are both connected to the first end of the switching transistor Q1. The other end of the fourth resistor R4 is grounded. The second end of the switching transistor Q1 is grounded. The third end of the switching transistor Q1 is connected to one end of the first inductor L1 through the fifth resistor R5. The other end of the first inductor L1 is used to connect to the DC bus 30 (e.g., connected to VCC, where VCC is the DC voltage of the bus). One end of the first inductor L1 is also connected to the DC bus 30.

[0032] The switching transistor Q1 includes a bipolar junction transistor (BJT). The first terminal of Q1 is the base, the second terminal is the emitter, and the third terminal is the collector. The third resistor R3 is the base current-limiting resistor; the fourth resistor R4 is the base pull-down resistor, used to maintain the stability of the base low level; the fifth resistor R5 is the magnetizing (pulling-up) resistor, the value of which can be adjusted according to the distance of the DC bus 30; and the first inductor L1 is the magnetizing inductor.

[0033] As one embodiment, the boost suppression module 13 includes a second diode D2. The anode of the second diode D2 is connected to one end of the first inductor L1, and the cathode of the second diode D2 is connected to the other end of the first inductor L1. The second diode D2 is connected in parallel across the first inductor L1, which can prevent the first inductor L1 from increasing the DC voltage of the bus when the switching transistor Q1 is switched on.

[0034] In one embodiment, the interference suppression module 14 includes a first capacitor C1 and a sixth resistor R6. One end of the first capacitor C1 is connected to the other end of the first inductor L1, and the other end of the first capacitor C1 is connected to one end of the first inductor L1 through the sixth resistor R6. In this embodiment, the RC circuit formed by the first capacitor C1 and the sixth resistor R6 can absorb switching noise on the DC bus 30, reduce EMI electromagnetic interference, and improve the reliability of the carrier communication circuit.

[0035] As one embodiment, the carrier communication circuit also includes a rectifier bridge 21, which is located on the slave device 20 side. Pin 1 of the rectifier bridge 21 is grounded, pin 2 is connected to the DC bus 30, pin 3 is connected to the electrical load on the slave device 20 side, and pin 4 is connected to the DC bus 30. The rectifier bridge 21 is located at the input terminal on the slave device 20 side, forming a reverse connection protection design for the slave device 20 and enabling polarity-free wiring of the slave device 20.

[0036] In some embodiments, the carrier communication circuit further includes a filtering module 22, which is located on the slave device 20 side. The filtering module 22 is connected to pin 3 of the rectifier bridge 21 and is used to filter the electrical signal input through the rectifier bridge 21. Specifically, the filtering module 22 includes a second capacitor C2 and a second inductor L2. One end of the second inductor L2 is connected to pin 3 of the rectifier bridge 21, and the other end of the second inductor L2 and the other end of the second capacitor C2 are connected to the load R0 on the slave device 20 side. The other end of the second capacitor C2 is grounded. VCC_OUT is the DC power separated from the DC bus 30, supplied to the peripherals on the slave device 20 side. The second inductor L2 is an isolation inductor used to isolate the carrier signal on the DC bus 30. Together with the second capacitor C2, it forms an LC filter circuit, providing DC power to the load while preventing the carrier communication signal on the bus from being consumed.

[0037] In this embodiment, a carrier communication circuit is formed using simple components such as resistors, capacitors, inductors, and diodes, resulting in a simple circuit structure. When the slave unit 20 is a wired controller in the air conditioner, this carrier communication circuit is used for communication between the host unit 10 and the wired controller. It can also provide power to the wired controller and alleviate the problems of low installation efficiency and high wiring costs caused by the need for RS485 (four-wire solution) in the wired controller, which is beneficial to the miniaturization and lightweighting of the entire device.

[0038] The carrier signal, i.e. the TX signal, can be a square wave signal with a transmission frequency of 50% / 9.6kHz, used to simulate a serial port signal with a baud rate of 19200. In other words, the carrier communication circuit in this embodiment can meet the requirements of high baud rate signal transmission, thereby improving communication efficiency.

[0039] This application also provides an air conditioner that includes the aforementioned carrier communication circuit. Since the carrier communication circuit has been described in detail above, it will not be repeated here.

[0040] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0041] The carrier communication circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A carrier communication circuit, characterized in that, The carrier communication circuit is applied to an air conditioner, which includes a main unit and a slave unit. The carrier communication circuit includes: A carrier modulation module is disposed on the host side, and the carrier modulation module is used to modulate the input modulation signal and carrier signal and output an excitation signal. A carrier excitation module is located on the host side and connected to the carrier modulation module. The carrier excitation module is used to connect to the DC bus and, according to the excitation signal, excites the DC voltage input to the DC bus and outputs it to the slave device.

2. The carrier communication circuit according to claim 1, characterized in that, The carrier communication circuit also includes a boost suppression module, which is connected to the carrier excitation module and is used to suppress the DC voltage of the DC bus.

3. The carrier communication circuit according to claim 2, characterized in that, The carrier communication circuit also includes an interference suppression module, which is connected to the carrier excitation module and is used to suppress electromagnetic interference on the DC bus.

4. The carrier communication circuit according to claim 3, characterized in that, The carrier modulation module includes a first resistor, a second resistor, and a first diode. One end of the first resistor and one end of the second resistor are both used to receive the modulation signal. The other end of the first resistor is energized, and the other end of the second resistor is connected to the carrier excitation module. The positive terminal of the first diode is used to receive the carrier signal, and the negative terminal of the first diode is connected to the carrier excitation module.

5. The carrier communication circuit according to claim 4, characterized in that, The carrier excitation module includes a third resistor, a fourth resistor, a fifth resistor, a first inductor, and a switching transistor. One end of the third resistor is connected to the other end of the second resistor and the cathode of the first diode. The other end of the third resistor and one end of the fourth resistor are both connected to the first end of the switching transistor. The other end of the fourth resistor is grounded. The second end of the switching transistor is grounded. The third end of the switching transistor is connected to one end of the first inductor through the fifth resistor. The other end of the first inductor is used to connect to the DC bus, and one end of the first inductor is also connected to the DC bus.

6. The carrier communication circuit according to claim 5, characterized in that, The boost suppression module includes a second diode, the positive terminal of which is connected to one end of the first inductor, and the negative terminal of which is connected to the other end of the first inductor.

7. The carrier communication circuit according to claim 5, characterized in that, The interference suppression module includes a first capacitor and a sixth resistor. One end of the first capacitor is connected to the other end of the first inductor, and the other end of the first capacitor is connected to one end of the first inductor through the sixth resistor.

8. The carrier communication circuit according to any one of claims 1-7, characterized in that, The carrier communication circuit also includes a rectifier bridge, which is located on the slave side. The first pin of the rectifier bridge is grounded, the second pin of the rectifier bridge is connected to the DC bus, the third pin of the rectifier bridge is connected to the electrical load on the slave side, and the fourth pin of the rectifier bridge is connected to the DC bus.

9. The carrier communication circuit according to claim 8, characterized in that, The carrier communication circuit also includes a filtering module, which is located on the slave side and connected to pin 3 of the rectifier bridge. The filtering module is used to filter the electrical signal input through the rectifier bridge.

10. An air conditioner, characterized in that, The air conditioner includes a carrier communication circuit as described in any one of claims 1-9.

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