Power supply polarity switching circuit and air conditioner

Abstract

The utility model discloses a power supply polarity switching circuit and an air conditioner, the power supply polarity switching circuit comprises a polarity detection module and a polarity switching module, a first detection end of the polarity detection module is used for being connected with a first power supply end of an external power supply module; a second detection end of the polarity detection module is used for being connected with a second power supply end of the external power supply module; the polarity detection module is used for controlling the polarity switching module to switch the positive input end of the power input module to be connected with the first power end and switch the negative input end of the power input module to be connected with the second power end when the first power end is the positive end and the second power end is the negative end; and the polarity detection module is also used for controlling the polarity switching module to switch the anode input end to be connected with the second power supply end and switch the cathode input end to be connected with the first power supply end when the first power supply end is the cathode and the second power supply end is the anode. The problem that the air conditioner breaks down due to the fact that the polarity of the power supply wiring is wrong can be solved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a power supply polarity switching circuit and an air conditioner. Background Technology

[0002] With the development of air conditioning, photovoltaic air conditioning has also emerged. However, because the DC power output from photovoltaic panels is prone to reverse polarity when connected to air conditioning equipment, the equipment may malfunction or even be damaged.

[0003] Therefore, the technology still needs to be improved and enhanced. Utility Model Content

[0004] This application provides a power polarity switching circuit and an air conditioner, which can alleviate the problem of air conditioning equipment easily malfunctioning due to reverse polarity connection when connected to an external power source.

[0005] This application provides a power polarity switching circuit for use in an air conditioner. The air conditioner includes a power input module, and the power polarity switching circuit includes:

[0006] The polarity detection module has a first detection terminal for connecting to the first power terminal of the external power module and a second detection terminal for connecting to the second power terminal of the external power module. The polarity detection module outputs a first detection signal when the first power terminal is positive and the second power terminal is negative, and outputs a second detection signal when the first power terminal is negative and the second power terminal is positive.

[0007] A polarity switching module is provided, wherein the signal input terminal of the polarity switching module is connected to the signal output terminal of the polarity detection module; the polarity switching module is used to switch the positive input terminal of the power input module to be connected to the first power terminal and the negative input terminal of the power input module to be connected to the second power terminal according to the first detection signal; the polarity switching module is also used to switch the positive input terminal of the power input module to be connected to the second power terminal and the negative input terminal of the power input module to be connected to the first power terminal according to the second detection signal.

[0008] In some embodiments of the power supply polarity switching circuit, the polarity switching module includes:

[0009] The controller has its signal input terminal connected to the signal output terminal of the polarity detection module. The controller is used to output a first control signal based on a first detection signal and to output a second control signal based on a second detection signal.

[0010] The switching unit has its control terminal connected to the signal output terminal of the controller. The switching unit is used to switch the positive input terminal of the power input module to be connected to the first power terminal and the negative input terminal of the power input module to be connected to the second power terminal according to the first control signal. The switching unit is also used to switch the positive input terminal of the power input module to be connected to the second power terminal and the negative input terminal of the power input module to be connected to the first power terminal according to the second control signal.

[0011] In some embodiments of the power polarity switching circuit, the switching unit includes a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor.

[0012] The control terminal of the first switch is connected to the signal output terminal of the controller; the first connection terminal of the first switch is connected to the first detection terminal; and the second connection terminal of the first switch is connected to the positive input terminal of the power input module. The control terminal of the second switch is connected to the signal output terminal of the controller; the first connection terminal of the second switch is connected to the second detection terminal; and the second connection terminal of the second switch is connected to the negative input terminal of the power input module. The control terminal of the third switch is connected to the signal output terminal of the controller; the first connection terminal of the third switch is connected to the second detection terminal; and the second connection terminal of the third switch is connected to the positive input terminal of the power input module. The control terminal of the fourth switch is connected to the signal output terminal of the controller; the first connection terminal of the fourth switch is connected to the second detection terminal; and the second connection terminal of the fourth switch is connected to the negative input terminal of the power input module.

[0013] The first and fourth switching transistors are used to turn on according to the first control signal and turn off according to the second control signal;

[0014] The second and third switching transistors are used to turn on according to the second control signal and turn off according to the first control signal.

[0015] In some embodiments of the power polarity switching circuit, the polarity detection module includes a detection unit and a pull-up unit; the signal output terminal of the detection unit is connected to the signal input terminal of the pull-up unit and the controller, the first detection terminal of the detection unit is used to connect to the first power supply terminal, and the second detection terminal of the detection unit is used to connect to the second power supply terminal.

[0016] The detection unit is used to ground the pull-up unit to output a first detection signal when the first power supply terminal is positive and the second power supply terminal is negative, and to output a second detection signal according to the pull-up unit when the first power supply terminal is negative and the second power supply terminal is positive.

[0017] In some embodiments of the power polarity switching circuit, the polarity detection module further includes a current limiting unit, which is connected in series between the first power supply terminal and the first detection terminal of the detection unit.

[0018] In some embodiments of the power polarity switching circuit, the detection unit includes an optocoupler, the anode of the optocoupler is connected to the current limiting unit, the cathode of the optocoupler is connected to the second power supply terminal, the collector of the optocoupler is connected to the pull-up unit and the signal input terminal of the controller, and the emitter of the optocoupler is grounded.

[0019] In some embodiments of the power polarity switching circuit, the pull-up unit includes a first resistor, one end of which is connected to power, and the other end of which is connected to the collector of the optocoupler.

[0020] In some embodiments of the power polarity switching circuit, the current limiting unit includes a second resistor, one end of which is connected to the first power supply terminal, and the other end of which is connected to the anode of the optocoupler.

[0021] In some embodiments of the power polarity switching circuit, the external power supply module includes a photovoltaic panel.

[0022] This application also provides an air conditioner, which includes a power input module and the power polarity switching circuit described above.

[0023] This application provides a power polarity switching circuit and an air conditioner. The power polarity switching circuit includes a polarity detection module and a polarity switching module. When an external power module is connected to a power input module, the polarity detection module detects the connection polarity of the external power module and then controls the polarity switching module to connect the positive input terminal of the power input module to the positive terminal of the external power module, and the negative input terminal of the power input module to the negative terminal of the external power module. This adaptively completes the polarity connection between the power input module and the external power module. Therefore, it is not necessary to distinguish the polarity of the external power module when connecting it, which improves the installation efficiency of the external power supply and prevents the air conditioner from malfunctioning due to incorrect power wiring polarity. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a structural block diagram of a power polarity switching circuit provided in an embodiment of this application.

[0026] Figure 2 This is a structural block diagram of the polarity switching module in the power polarity switching circuit provided in an embodiment of this application.

[0027] Figure 3 The circuit structure diagram of the power polarity switching circuit provided in the embodiment of this application is shown.

[0028] Figure 4This is a schematic diagram of the state timing of the switching unit in the power polarity switching circuit provided in the embodiments of this application. Detailed Implementation

[0029] 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.

[0030] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] Please see Figure 1 This application provides a power polarity switching circuit 10, which is applied in an air conditioner. The air conditioner includes a power input module 20 and a load 30, which can be an inverter in the air conditioner. The power input module 20 converts the electrical energy input from the external power module 40 and outputs it to the inverter, which drives the compressor and fan in the air conditioner. The external power module 40 can be a photovoltaic panel, which provides DC power to the air conditioner.

[0032] The power polarity switching circuit 10 includes a polarity detection module 11 and a polarity switching module 12. The first detection terminal of the polarity detection module 11 is used to connect to the first power terminal C of the external power module 40, and the second detection terminal of the polarity detection module 11 is used to connect to the second power terminal D of the external power module 40. The polarity switching module 12 is located between the power input module 20 and the external power module 40, and the signal input terminal of the polarity switching module 12 is connected to the signal output terminal of the polarity detection module 11.

[0033] In a specific embodiment, the polarity detection module 11 is used to output a first detection signal when the first power terminal C is the positive terminal and the second power terminal D is the negative terminal, and to output a second detection signal when the first power terminal C is the negative terminal and the second power terminal D is the positive terminal; the polarity switching module 12 is used to switch the positive input terminal A of the power input module 20 to be connected to the first power terminal C according to the first detection signal, and to switch the negative input terminal B of the power input module 20 to be connected to the second power terminal D; the polarity switching module 12 is also used to switch the positive input terminal A of the power input module 20 to be connected to the second power terminal D according to the second detection signal, and to switch the negative input terminal B of the power input module 20 to be connected to the first power terminal C, so that the external power module 40 and the power input module 20 are in a positive connection state.

[0034] In this embodiment, when the external power module 40 is connected to the power input module 20, the polarity detection module 11 detects the connection polarity of the external power module 40. When the first power terminal C is the positive terminal and the second power terminal D is the negative terminal, the polarity switching module 12 controls the positive input terminal A of the power input module 20 to connect to the first power terminal C, and connects the negative input terminal B of the power input module 20 to the second power terminal D. Conversely, when the first power terminal C is the negative terminal and the second power terminal D is the positive terminal, the polarity switching module 12 controls the positive input terminal A of the power input module 20 to connect to the second power terminal D, and connects the negative input terminal B of the power input module 20 to the first power terminal C. This adaptively completes the polarity connection between the power input module 20 and the external power module 40. Therefore, when connecting the external power module 40, it is not necessary to distinguish the polarity of the external power module 40, which improves the installation efficiency of the external power supply and prevents the air conditioner from malfunctioning due to incorrect power wiring polarity.

[0035] Please see Figure 2 In some embodiments, the polarity switching module 12 includes a controller 121 and a switching unit 122. The signal input terminal of the controller 121 is connected to the signal output terminal of the polarity detection module 11, and the control terminal of the switching unit 122 is connected to the signal output terminal of the controller 121.

[0036] In specific implementation, the controller 121 is used to output a first control signal according to the first detection signal and to output a second control signal according to the second detection signal; the switching unit 122 is used to switch the positive input terminal A of the power input module 20 to be connected to the first power terminal C according to the first control signal, and to switch the negative input terminal B of the power input module 20 to be connected to the second power terminal D; the switching unit 122 is also used to switch the positive input terminal A of the power input module 20 to be connected to the second power terminal D according to the second control signal, and to switch the negative input terminal B of the power input module 20 to be connected to the first power terminal C, thereby realizing the function that the external power module 40 does not need to distinguish polarity when connected to the air conditioner, improving the installation efficiency of the external power supply and the reliability of the air conditioner.

[0037] Please refer to the following: Figure 3 In one embodiment, the switching unit 122 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The control terminal of the first switch S1 is connected to the signal output terminal of the controller 121, the first connection terminal of the first switch S1 is connected to the first detection terminal, and the second connection terminal of the first switch S1 is connected to the positive input terminal A of the power input module 20. The control terminal of the second switch S2 is connected to the signal output terminal of the controller 121, the first connection terminal of the second switch S2 is connected to the first detection terminal, and the second switch S4... The second connection terminal of the third switch S3 is connected to the negative input terminal B of the power input module 20; the control terminal of the third switch S3 is connected to the signal output terminal of the controller 121, the first connection terminal of the third switch S3 is connected to the second detection terminal, and the second connection terminal of the third switch S3 is connected to the positive input terminal A of the power input module 20; the control terminal of the fourth switch S4 is connected to the signal output terminal of the controller 121, the first connection terminal of the fourth switch S4 is connected to the second detection terminal, and the second connection terminal of the fourth switch S4 is connected to the negative input terminal B of the power input module 20.

[0038] In this embodiment, the first switch S1 and the fourth switch S4 are turned on according to the first control signal and turned off according to the second control signal, while the second switch S2 and the third switch S3 are turned on according to the second control signal and turned off according to the first control signal. Two switches are provided at the positive input terminal A of the power input module 20, respectively connecting to the first power terminal C and the second power source of the power module. Similarly, two switches are provided at the negative input terminal B of the power input module 20, respectively connecting to the second power source of the power module. When the first power terminal C is the positive terminal and the second power terminal D is the negative terminal, the controller 121 controls the first switch S1 and the fourth switch S4 to turn on, and the second switch S2 and the third switch S3 to turn off. At this time, the first power terminal C is connected to the positive terminal of the power input module 20, and the second power terminal D is connected to the negative terminal of the power input module 20. When the first power terminal C is the negative terminal and the second power terminal D is the positive terminal, the controller 121 controls the first switch S1 and the fourth switch S4 to disconnect, while the second switch S2 and the third switch S3 are turned on. This connects the first power terminal C to the negative input terminal B and the second power terminal D to the positive input terminal A. This ensures that regardless of the polarity of the external power module 40, the polarity connection with the power input module 20 is consistent, eliminating the need to distinguish the polarity of the external power supply during installation and improving installation efficiency.

[0039] In the switching unit 122, each switching transistor can be selected from any one of MOSFET, IGBT, and transistor.

[0040] In some embodiments, the polarity detection module 11 includes a detection unit 111 and a pull-up unit 112; the signal output terminal of the detection unit 111 is connected to the signal input terminal of the pull-up unit 112 and the controller 121; the first detection terminal of the detection unit 111 is used to connect to the first power supply terminal C; and the second detection terminal of the detection unit 111 is used to connect to the second power supply terminal D.

[0041] The detection unit 111 is used to ground the pull-up unit 112 to output a first detection signal when the first power supply terminal C is positive and the second power supply terminal D is negative, and to output a second detection signal according to the pull-up unit 112 when the first power supply terminal C is negative and the second power supply terminal D is positive. In this embodiment, the first detection signal is a low-level signal and the second detection signal is a high-level signal. The detection unit 111 outputs different level signals according to the polarity of the external input power supply to facilitate subsequent control of the conduction state of each switch in the switching unit 122.

[0042] In other embodiments, the polarity detection module 11 further includes a current limiting unit 113, which is connected in series between the first power supply terminal C and the first detection terminal of the detection unit 111. In this embodiment, by setting the current limiting unit 113 between the first detection terminal of the detection unit 111 and the first power supply terminal C, excessive current is prevented, thereby improving the reliability of the power polarity switching circuit 10.

[0043] Please continue reading. Figure 3 In one embodiment, the detection unit 111 includes an optocoupler OP1. The anode of the optocoupler OP1 is connected to the current limiting unit 113, the cathode of the optocoupler OP1 is connected to the second power supply terminal D, the collector of the optocoupler OP1 is connected to the signal input terminal of the pull-up unit 112 and the controller 121, the emitter of the optocoupler OP1 is grounded, and the pull-up unit 112 includes a first resistor R1. One end of the first resistor R1 is energized, and the other end of the first resistor R1 is connected to the collector of the optocoupler OP1.

[0044] When the anode of optocoupler OP1 is connected to the positive terminal of external power module 40 and the cathode of optocoupler OP1 is connected to the negative terminal of external power module 40, the light-emitting diode inside optocoupler OP1 is forward-biased, and the first resistor R1 of optocoupler OP1 is grounded. At this time, the collector of optocoupler OP1 outputs a low-level signal to controller 121. When the anode of optocoupler OP1 is connected to the negative terminal of external power module 40 and the cathode of optocoupler OP1 is connected to the positive terminal of external power module 40, optocoupler OP1 is not conducting. At this time, the collector of optocoupler OP1 provides a high-level signal to controller 121 based on the pull-up effect of the first resistor R1.

[0045] Please refer to the following: Figure 4 In this controller 121, the GPIO1 port is a signal input port. When the GPIO1 port is low, the controller 121 outputs a first control signal to turn on the first switch S1 and the fourth switch S4, and turn off the second switch S2 and the third switch S3. When the GPIO1 port is high, the controller 121 outputs a second control signal to turn off the first switch S1 and the fourth switch S4, and turn on the second switch S2 and the third switch S3. It should be noted that when the controller 121 does not output a control signal, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are in the off state by default.

[0046] As one embodiment, the current limiting unit 113 includes a second resistor R2. One end of the second resistor R2 is connected to the first power supply terminal C, and the other end of the second resistor R2 is connected to the anode of the optocoupler OP1. In this embodiment, current limiting protection for the optocoupler OP1 is achieved by connecting a resistor in series, which simplifies the circuit structure and improves the reliability of the power polarity switching circuit 10.

[0047] This application also provides an air conditioner that includes the power polarity switching circuit described above. Since the power polarity switching circuit has been described in detail above, it will not be repeated here.

[0048] 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.

[0049] The power polarity switching 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 power supply polarity switching circuit applied to an air conditioner, the air conditioner comprising a power input module, characterized in that, The power supply polarity switching circuit comprises: a polarity detection module, a first detection end of the polarity detection module being used for being connected with a first power supply end of an external power supply module, a second detection end of the polarity detection module being used for being connected with a second power supply end of the external power supply module; the polarity detection module being used for outputting a first detection signal when the first power supply end is a positive end and the second power supply end is a negative end, and outputting a second detection signal when the first power supply end is a negative end and the second power supply end is a positive end; a polarity switching module, a signal input end of the polarity switching module being connected with a signal output end of the polarity detection module; the polarity switching module being used for switching a positive input end of a power supply input module to be connected with the first power supply end and switching a negative input end of the power supply input module to be connected with the second power supply end according to the first detection signal; the polarity switching module being further used for switching the positive input end of the power supply input module to be connected with the second power supply end and switching the negative input end of the power supply input module to be connected with the first power supply end according to the second detection signal.

2. The power supply polarity switching circuit of claim 1, wherein, The polarity switching module comprises: a controller, a signal input end of the controller being connected with a signal output end of the polarity detection module, the controller being used for outputting a first control signal according to the first detection signal and being used for outputting a second control signal according to the second detection signal; a switching unit, a control end of the switching unit being connected with a signal output end of the controller, the switching unit being used for switching the positive input end of the power supply input module to be connected with the first power supply end and switching the negative input end of the power supply input module to be connected with the second power supply end according to the first control signal; the switching unit being further used for switching the positive input end of the power supply input module to be connected with the second power supply end and switching the negative input end of the power supply input module to be connected with the first power supply end according to the second control signal.

3. The power supply polarity switching circuit of claim 2, wherein, The switching unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; a control end of the first switch tube being connected with a signal output end of the controller, a first connection end of the first switch tube being connected with the first detection end, a second connection end of the first switch tube being connected with the positive input end of the power supply input module; a control end of the second switch tube being connected with the signal output end of the controller, a first connection end of the second switch tube being connected with the second detection end, a second connection end of the second switch tube being connected with the negative input end of the power supply input module; a control end of the third switch tube being connected with the signal output end of the controller, a first connection end of the third switch tube being connected with the second detection end, a second connection end of the third switch tube being connected with the positive input end of the power supply input module; a control end of the fourth switch tube being connected with the signal output end of the controller, a first connection end of the fourth switch tube being connected with the second detection end, a second connection end of the fourth switch tube being connected with the negative input end of the power supply input module; The first switch tube and the fourth switch tube are used for being turned on according to the first control signal and being turned off according to the second control signal; The second switch tube and the third switch tube are used for being turned on according to the second control signal and being turned off according to the first control signal.

4. The power supply polarity switching circuit of claim 2, wherein, The polarity detection module comprises a detection unit and a pull-up unit; a signal output end of the detection unit is connected with a signal input end of the pull-up unit and the controller; a first detection end of the detection unit is used for being connected with the first power supply end; and a second detection end of the detection unit is used for being connected with the second power supply end. The detection unit is used for grounding the pull-up unit to output the first detection signal when the first power supply end is a positive end and the second power supply end is a negative end, and outputting a second detection signal according to the pull-up unit when the first power supply end is negative and the second power supply end is positive.

5. The power supply polarity switching circuit of claim 4, wherein, The polarity detection module further comprises a current limiting unit, which is used for being connected in series between the first power supply end and the first detection end of the detection unit.

6. The power supply polarity switching circuit of claim 5, wherein, The detection unit comprises an optoelectronic coupler; an anode of the optoelectronic coupler is connected with the current limiting unit; a cathode of the optoelectronic coupler is used for being connected with the second power supply end; a collector of the optoelectronic coupler is connected with the pull-up unit and the signal input end of the controller; and an emitter of the optoelectronic coupler is grounded.

7. The power supply polarity switching circuit of claim 6, wherein, The pull-up unit comprises a first resistor; one end of the first resistor is connected with electricity; and the other end of the first resistor is connected with the collector of the optoelectronic coupler.

8. The power supply polarity switching circuit of claim 6, wherein, The current limiting unit comprises a second resistor; one end of the second resistor is used for being connected with the first power supply end; and the other end of the second resistor is connected with the anode of the optoelectronic coupler.

9. The power supply polarity switching circuit according to any one of claims 1 to 8, characterized by, The external power supply module comprises a photovoltaic panel.

10. An air conditioner characterized by comprising: The air conditioner comprises a power input module and a power polarity switching circuit according to any one of claims 1-9.

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