Power supply circuit and device

Abstract

The utility model discloses a power supply circuit and device. The power supply circuit comprises a first power supply module, a second power supply module, a first electric energy output module and a controller, the first power supply module comprises a rectifier and a first switch connected with the rectifier in series. The rectifier is used for converting first alternating current input by a power grid into first direct current and outputting the first direct current through the first switch. The second power supply module comprises a photovoltaic unit and a second switch connected in series with the photovoltaic unit; the photovoltaic unit is used for converting light energy into second direct current and outputting the second direct current through the second switch; the first electric energy output module is connected with the first switch and the second switch and is used for supplying power to the first load according to the first direct current and / or the second direct current; the controller is connected with the photovoltaic unit and the first electric energy output module, and the controller is used for controlling the working states of the photovoltaic unit and the first electric energy output module; according to the invention, power grid power supply and photovoltaic power are combined, so that full utilization of photovoltaic energy is realized, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to a power supply circuit and device. Background Art

[0002] At present, DC variable frequency air conditioners are generally driven by power provided by the city power grid. With the development of green energy, the goal is to achieve energy conservation and emission reduction, and then adopt emerging and clean energy to replace conventional energy. In particular, the development of photovoltaic energy storage systems; however, all traditional household appliances are powered by AC power from the grid and cannot be connected to the photovoltaic system, wasting a lot of clean light energy. Utility Model Content

[0003] The present application provides a power supply circuit and device that can utilize photovoltaic energy to provide electrical energy to reduce energy consumption.

[0004] The present application provides a power supply circuit, which includes a first power supply module, a second power supply module, a first power output module and a controller; the first power supply module includes a rectifier and a first switch connected in series with the rectifier, the rectifier is used to convert a first alternating current input from a power grid into a first direct current and then output it through the first switch; the second power supply module includes a photovoltaic unit and a second switch connected in series with the photovoltaic unit, the photovoltaic unit is used to convert light energy into a second direct current and then output it through the second switch; the first power output module is connected to the first switch and the second switch, respectively, the power output module is used to supply power to a first load according to the first direct current and / or the second direct current; the controller is connected to the photovoltaic unit and the first power output module, respectively, the controller is used to control the working states of the photovoltaic unit and the first power output module.

[0005] In some embodiments, the power supply circuit also includes a third power supply module, which includes an inverter and a third switch connected in series with the inverter; the inverter is also connected to the second switch, and the inverter is used to convert the second direct current into a second alternating current and then supply power to the grid through the third switch.

[0006] In some embodiments, the power supply circuit further includes a second power output module, which is respectively connected to the first switch and the second switch; the second power output module is used to power the controller according to the first direct current and / or the second direct current; the controller is also used to power the second load according to the power output by the second power output module.

[0007] In some embodiments, the power supply circuit also includes a filter, which is connected to the rectifier and the third switch respectively; the filter is used to filter the first alternating current input from the power grid and output it to the rectifier, or to filter the second alternating current output from the inverter and output it to the power grid.

[0008] In some embodiments, the power supply circuit, the second power output module includes a switching power supply circuit, which is respectively connected to the first switch, the second switch and the controller, and the switching power supply circuit is used to provide power to the controller according to the first direct current and / or the second direct current.

[0009] In some embodiments of the power supply circuit, the first power output module includes a frequency converter, the first load includes a compressor and a fan, and the frequency converter is connected to the compressor and the fan respectively; the frequency converter is used to provide power to the compressor and the fan according to the first direct current and / or the second direct current.

[0010] In the power supply circuit of some embodiments, the first switch includes a first DC contactor, and the first DC contactor is configured to be in a normally closed state when power is off.

[0011] In the power supply circuit of some embodiments, the second switch includes a second DC contactor, and the second DC contactor is configured to be in a normally open state when power is off.

[0012] In the power supply circuit of some embodiments, the third switch includes an AC contactor, and the AC contactor is configured to be in a normally open state when power is off.

[0013] A power supply device is also provided in an embodiment of the present application, and the power supply device includes the above-mentioned power supply circuit.

[0014] The present application provides a power supply circuit and device, wherein the rectifier in the power supply circuit converts the first alternating current input from the power grid into the first direct current and then outputs it through the first switch, and the photovoltaic unit is used to convert light energy into the second direct current and then output it through the second switch; the first power output module is used to supply power to the first load according to the first direct current and / or the second direct current; the controller is used to control the working state of the photovoltaic unit and the first power output module. In the present application, by setting the first switch and the second switch, the photovoltaic unit is connected to the output end of the rectifier, thereby combining the power supply of the power grid with photovoltaics, so as to fully utilize the photovoltaic energy and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0016] Figure 1 A first structural schematic diagram of a power supply circuit provided in an embodiment of the present application.

[0017] Figure 2 A second structural schematic diagram of the power supply circuit provided in an embodiment of the present application.

[0018] Figure 3 A third structural schematic diagram of the power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0021] See also Figure 1 , this embodiment provides a power supply circuit, which can be used to provide electric energy for air conditioners or household appliances. Specifically, the power supply circuit includes a first power supply module 11, a second power supply module 12, a first power output module 13 and a controller 14, the first power supply module 11 includes a rectifier 111 and a first switch 112 connected in series with the rectifier 111, the second power supply module 12 includes a photovoltaic unit 121 and a second switch 122 connected in series with the photovoltaic unit 121; the first power output module 13 is connected to the first switch 112 and the second switch 122 respectively, and the controller 14 is connected to the photovoltaic unit 121 and the first power output module 13 respectively.

[0022] Among them, the rectifier 111 is used to convert the first alternating current input from the power grid into the first direct current and then output it through the first switch 112, the photovoltaic unit 121 is used to convert the light energy into the second direct current and then output it through the second switch 122; the first power output module 13 is used to supply power to the first load 10 according to the first direct current and / or the second direct current; the controller 14 is used to control the working state of the photovoltaic unit 121 and the first power output module 13. Specifically, the controller 14 can control the photovoltaic unit 121 and the first power output module 13 to work at the same time, at which time the first power output module 13 can supply power to the first load 10 according to the first direct current and the second direct current, or can only supply power to the first load 10 according to the second direct current provided by the photovoltaic unit 121, that is, at this time the power supply of the power grid does not participate in the work. The controller 14 can also control the first power output module 13 to work alone, at which time the first power output module 13 only supplies power to the first load 10 according to the first direct current, thereby combining the power supply of the power grid with photovoltaics, so as to achieve full utilization of photovoltaic energy and reduce energy consumption.

[0023] In some embodiments, the power supply circuit further includes a third power supply module 15, which includes an inverter 151 and a third switch 152 connected in series with the inverter 151; the inverter 151 is also connected to the second switch 122, and the inverter 151 is used to convert the second direct current into the second alternating current and then supply power to the grid through the third switch 152. The second direct current is provided by the photovoltaic unit 121, that is, the photovoltaic unit 121 in this embodiment can generate additional power to the grid while satisfying the requirement of supplying power to the first load 10.

[0024] See also Figure 2 In some embodiments, the power supply circuit further includes a second power output module 16, which is connected to the first switch 112 and the second switch 122 respectively; the second power output module 16 is used to supply power to the controller 14 according to the first direct current and / or the second direct current; the controller 14 is also used to supply power to the second load 20 according to the power output by the second power output module 16. That is, the power supply circuit in this embodiment can provide multiple power output channels according to different loads, so as to realize full utilization of photovoltaic energy.

[0025] In some embodiments, the power supply circuit further includes a filter 17, which is connected to the rectifier 111 and the third switch 152 respectively; the filter 17 is used to filter the first alternating current input from the power grid and output it to the rectifier 111, or to filter the second alternating current output from the inverter 151 and output it to the power grid. That is, in this embodiment, the filter 17 is set to filter the electric energy input from the power grid or the electric energy provided by the photovoltaic unit 121 to provide power supply stability, thereby improving the safety of the power supply circuit.

[0026] In some embodiments, the second power output module 16 includes a switching power supply circuit, which is respectively connected to the first switch 112, the second switch 122 and the controller 14; the switching power supply circuit is used to provide power to the controller 14 according to the first direct current and / or the second direct current to ensure the normal operation of the controller 14. At the same time, the controller 14 supplies power to the second load 20 and controls the working state of the second load 20. The second load 20 in this embodiment is a full DC load. It should be noted that the switching power supply circuit in this embodiment is a known circuit structure, so the specific circuit and power supply process of the switching power supply circuit are not described in detail.

[0027] See also Figure 3In some embodiments, the first power output module 13 includes a frequency converter 131, and the first load 10 includes a compressor 101 and a fan 102; the frequency converter 131 is connected to the compressor 101 and the fan 102 respectively; the frequency converter 131 is used to provide power to the compressor 101 and the fan 102 according to the first direct current and / or the second direct current. Specifically, the frequency converter 131 converts the first direct current and / or the second direct current into corresponding alternating current to power the compressor 101 and the fan 102 respectively, so as to realize the power supply function of the compressor 101 and the fan 102.

[0028] In some embodiments, the first switch 112 includes a first DC contactor, which is used to be in a normally closed state when the power is off, ensuring that the rectifier 111 forms a power supply path with the first power output module 13 and the second power output module 16. The second switch 122 includes a second DC contactor, which is used to be in a normally open state when the power is off, that is, the second DC contactor disconnects the power supply path between the photovoltaic unit 121 and the first power output module 13, the second power output module 16 and the second power supply module 12 when the power is off. The third switch 152 includes an AC contactor, which is used to be in a normally open state when the power is off, that is, the AC contactor disconnects the power generation path from the photovoltaic unit 121 to the power grid when the power is off. Thus, by setting different types of switches, effective control of the power supply path is achieved, ensuring that the power supply circuit realizes a variety of different power supply modes.

[0029] Specifically, the power supply circuit can realize a pure grid power supply mode; at this time, the photovoltaic unit 121 does not work, the second switch 122 and the third switch 152 are both in the disconnected state, the first switch 112 is turned on, and the first alternating current output by the grid provides power for the subsequent controller 14, the compressor 101 and the fan 102. Among them, the controller 14 adjusts the operating frequency of the compressor 101 and the fan 102 according to the setting, and provides power to the second load 20 to control the working state of the second load 20.

[0030] The power supply circuit in this embodiment can also realize the simultaneous power supply mode of the power grid and photovoltaic. When the power grid and the photovoltaic unit 121 are powered at the same time, the second direct current generated by the photovoltaic unit 121 is given priority to power the compressor 101, the fan 102 and the second load 20, and the second switch 122 is in the on state. The controller 14 establishes real-time communication with the photovoltaic unit 121, and the controller 14 determines whether the current power supply of the photovoltaic unit 121 can meet the needs of the compressor 101, the fan 102 and the controller 14. When the power provided by the photovoltaic unit 121 is insufficient to maintain the normal operation of the compressor 101, the fan 102 and the second load 20, the power supply of the power grid is connected again, and the corresponding first switch 112 is in the on state, and at this time the photovoltaic unit 121 will automatically adjust the output voltage so that it is equal to the voltage after the power grid input is output through the rectifier 111, thereby ensuring the normal operation of the first load 10 and the second load 20 while achieving full utilization of photovoltaic energy. It should be noted that the photovoltaic unit 121 in this embodiment converts light energy into electrical energy, which is a known technology. The specific structure and working process of the photovoltaic unit 121 will not be described in detail here.

[0031] The power supply circuit in this embodiment can also realize a pure photovoltaic power supply mode, in which case the power generated by the photovoltaic unit 121 can fully meet the power required for the operation of the first load 10 and the second load 20, and the power input from the power grid will be disconnected. Correspondingly, the first switch 112 and the third switch 152 are disconnected, and the second switch 122 is turned on, and only the photovoltaic unit 121 provides power to the first load 10 and the second load 20.

[0032] The power supply circuit in this embodiment can also realize photovoltaic power supply and power generation mode, and the power provided by the photovoltaic unit 121 can not only meet the normal operation of the first load 10 and the second load 20, but also generate additional power to the power grid. At this time, the first switch 112 is disconnected, and the second switch 122 and the third switch 152 are both turned on, and the additional power generated by the photovoltaic unit 121 is used to generate power to the power grid through the inverter 151 and the filter 17.

[0033] An embodiment of the present application further provides a power supply device, which includes the above-mentioned power supply circuit. Since the power supply circuit is described in detail above, it will not be repeated here.

[0034] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0035] The power supply circuit provided in the embodiments of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply circuit, characterized in that: include: A first power supply module, the first power supply module comprising a rectifier and a first switch connected in series with the rectifier, the rectifier being used to convert a first alternating current input from a power grid into a first direct current and then output the first direct current through the first switch; A second power supply module, the second power supply module comprising a photovoltaic unit and a second switch connected in series with the photovoltaic unit, the photovoltaic unit being used to convert light energy into a second direct current and then output it through the second switch; a first power output module, the first power output module being connected to the first switch and the second switch respectively, and the first power output module being used to supply power to a first load according to the first direct current and / or the second direct current; A controller is connected to the photovoltaic unit and the first electric energy output module respectively, and is used to control the working states of the photovoltaic unit and the first electric energy output module.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a third power supply module, which includes an inverter and a third switch connected in series with the inverter; the inverter is also connected to the second switch, and the inverter is used to convert the second direct current into a second alternating current and then supply power to the power grid through the third switch.

3. The power supply circuit according to claim 2, characterized in that: The power supply circuit further includes a second power output module, which is connected to the first switch and the second switch respectively; the second power output module is used to supply power to the controller according to the first direct current and / or the second direct current; The controller is further configured to supply power to a second load according to the electric energy output by the second electric energy output module.

4. The power supply circuit according to claim 2, characterized in that: The power supply circuit further includes a filter, and the filter is connected to the rectifier and the third switch respectively; The filter is used for filtering the first alternating current input from the power grid and outputting it to the rectifier, or filtering the second alternating current output from the inverter and outputting it to the power grid.

5. The power supply circuit according to claim 3, characterized in that: The second power output module includes a switching power supply circuit, which is respectively connected to the first switch, the second switch and the controller, and is used to provide power to the controller according to the first direct current and / or the second direct current.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The first power output module includes a frequency converter, the first load includes a compressor and a fan, and the frequency converter is connected to the compressor and the fan respectively; the frequency converter is used to provide power to the compressor and the fan according to the first direct current and / or the second direct current.

7. The power supply circuit according to claim 5, characterized in that: The first switch includes a first DC contactor, and the first DC contactor is configured to be in a normally closed state when power is off.

8. The power supply circuit according to claim 5, characterized in that: The second switch includes a second DC contactor, and the second DC contactor is configured to be in a normally open state when power is off.

9. The power supply circuit according to claim 5, characterized in that: The third switch comprises an AC contactor, and the AC contactor is used to be in a normally open state when power is off.

10. A power supply device, characterized in that: The power supply device comprises the power supply circuit according to any one of claims 1-9.

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