High-precision bidirectional converter for green energy storage and circulation

Abstract

The utility model discloses a high-precision bidirectional converter for green energy storage and circulation, which comprises a photovoltaic energy storage unit, an energy storage power supply, a circuit control board, a steady-current AC / DC circuit and a bidirectional converter, and the output end of the steady-current AC / DC circuit and the output end of a mains supply are switched and connected with a change-over switch. The output end of the change-over switch is connected to the input end of the bidirectional converter, the energy storage power supply supplies power to the circuit control board, and the circuit control board is used for regulating and controlling the photovoltaic energy storage unit, the steady-current AC / DC circuit, the change-over switch and the bidirectional converter. According to the utility model, the photovoltaic module is built on the unoccupied ground around the charging pile, the electric energy converted from the collected light energy is stored in the energy storage battery, the electric energy in the energy storage battery can provide stable output direct current, and the stable direct current can supply power to the control board of the control circuit. And the power can be directly input into the bidirectional inverter for charging the automobile and then is combined with the commercial power for charging the automobile, so that the green energy utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of converters, in particular to a high-precision bidirectional converter for green energy storage and recycling. Background Art

[0002] Bidirectional converters are largely used in the charging technology of new energy vehicles. For most new energy vehicle owners, charging at the destination should be the most ideal way, which can avoid the trouble of frequently going to DC charging stations. Many outdoor charging piles occupy a certain amount of ground space. Moreover, charging piles generally only have one charging mode, that is, DC charging or AC charging, and cannot be switched according to needs. At present, with the wide range of energy application scenarios and energy shortage, the low utilization rate of new energy makes it a difficult problem that these green energies cannot be collected and stored locally. Moreover, the stability of the conversion of the light energy collected by photovoltaic into electric energy is constantly changing and generally cannot be used directly for electricity because the voltage and current are unstable. For vehicle charging, stable voltage and current are required for both DC charging and AC charging. Therefore, how to combine the electric energy collected by photovoltaic with the mains power to charge vehicles, improve the power consumption efficiency and utilization rate will be the problem that needs to be solved by charging piles at the present stage. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent. For this reason, an object of the utility model is to provide a high-precision bidirectional converter for green energy storage and recycling, which solves the problems that a charging pile cannot intelligently switch the charging mode and cannot efficiently utilize new energy, etc.

[0004] A high-precision bidirectional converter for green energy storage and recycling according to the utility model includes a photovoltaic energy storage unit, an energy storage power supply, a circuit control board, a current-stabilizing AC / DC circuit and a bidirectional converter. The photovoltaic energy storage unit charges electric energy into the energy storage power supply through a charging interface of the energy storage power supply. The energy storage power supply converts the direct current of the energy storage power supply into stable alternating current through the current-stabilizing AC / DC circuit. Another charging interface of the energy storage power supply is connected to a charging circuit through the mains power for charging. The output end of the current-stabilizing AC / DC circuit and the output end of the mains power are switched and connected through a changeover switch. The output end of the changeover switch is connected to the input end of the bidirectional converter. The energy storage power supply supplies power to the circuit control board, and the circuit control board is used to regulate the photovoltaic energy storage unit, the current-stabilizing AC / DC circuit, the changeover switch and the bidirectional converter.

[0005] In some embodiments of the utility model, the photovoltaic energy storage unit includes a photovoltaic module, an AC / DC circuit and a charging circuit. The light energy collected by the photovoltaic module is converted into DC power and then converted into AC power through the AC / DC circuit. The output end of the AC / DC circuit is connected to the charging circuit and the charging circuit is connected to a charging interface of the energy storage power supply.

[0006] In some other embodiments of the utility model, the circuit control board is provided with a primary DSP and a control circuit and a secondary DSP and a control circuit, and the primary DSP and the control circuit and the secondary DSP and the control circuit are used to regulate the AC / DC circuit and the steady-current AC / DC circuit respectively.

[0007] In some other embodiments of the utility model, the bidirectional converter includes a transformer winding group and an inverter circuit, the transformer winding group includes a positive winding group and a secondary winding group, one side of the secondary winding group is connected to an output wire at the end, and the other side is connected to three output wires at intervals from the end to the inside, and each of the three output wires is provided with a conversion electronically controlled switch, the three output wires are connected at the output end and then output, and one output wire of the secondary winding group and the three output wires are respectively connected to the two interfaces at the input end of the inverter circuit.

[0008] In some other embodiments of the utility model, the inverter circuit includes two groups of two unidirectional diodes connected in series and a capacitor. The two groups of circuits of the unidirectional diodes connected in series are connected in parallel and then output, and a capacitor is provided on the output circuit. The two output lines of the secondary winding group are each provided with a first inverter switch, and the two output circuits of the unidirectional diode series circuit connected in parallel are each provided with a second inverter switch. The first of the first inverter switches is electrically connected to the first of the second inverter switches, and the second of the first inverter switches is electrically connected to the second of the second inverter switches.

[0009] In some other embodiments of the present utility model, the input end of the positive winding group is electrically connected to the output end of the switching switch, and the input end of the switching switch is a switching electronically controlled bidirectional switch.

[0010] In the utility model, a photovoltaic module is built on the vacant ground around the charging pile, and the electric energy converted from the collected light energy is stored in the energy storage battery. The electric energy in the energy storage battery can provide a stable output direct current, which can power the control board of the control circuit and can also be directly input into the bidirectional inverter for charging the car, and then combined with the city electricity to charge the car, thereby improving the utilization rate of green energy. Brief Description of the Figures

[0011] The accompanying drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the accompanying drawings:

[0012] Figure 1 It is a schematic circuit diagram of a high-precision bidirectional converter for green energy storage and recycling proposed by the present utility model.

[0013] Figure 2 It is a schematic circuit diagram of the bidirectional converter proposed by the present utility model. Detailed implementation manners

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0015] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0016] Refer to Figure 1-2 , a high-precision bidirectional converter for green energy storage and recycling, includes a photovoltaic energy storage unit, an energy storage power supply, a circuit control board, a current-stabilized AC / DC circuit, and a bidirectional converter. The photovoltaic energy storage unit charges electrical energy into the energy storage power supply through a charging interface of the energy storage power supply. The energy storage power supply converts the direct current of the energy storage power supply into stable alternating current through the current-stabilized AC / DC circuit. At another charging interface of the energy storage power supply, it is charged through the mains power connection to the charging circuit. The output end of the current-stabilized AC / DC circuit and the output end of the mains power are switched and connected through a changeover switch. The output end of the changeover switch is connected to the input end of the bidirectional converter. The energy storage power supply supplies power to the circuit control board, and the circuit control board is used to regulate the photovoltaic energy storage unit, the current-stabilized AC / DC circuit, the changeover switch, and the bidirectional converter.

[0017] Since the light intensity is constantly changing, the energy collected by the photovoltaic is not suitable for directly outputting to the bidirectional converter, as it cannot provide stable voltage and current. Therefore, the electrical energy collected and converted by the photovoltaic energy storage unit is first stored in the energy storage power supply. Since the energy storage power supply, i.e., the storage battery, can provide stable voltage and current, the stable alternating current converted by the current-stabilized AC / DC circuit is input into the bidirectional converter to achieve the output of stable alternating current or direct current.

[0018] The changeover switch is used to switch between the electrical energy output by the constant-current AC / DC circuit and the mains power supply. The circuit control board is used to control the opening and closing of the electrical control switch in the changeover switch and the electrical control switch in the bidirectional converter.

[0019] The photovoltaic energy storage unit includes a photovoltaic module, an AC / DC circuit, and a charging circuit. The light energy collected by the photovoltaic module is converted into direct current electrical energy and then converted into alternating current through the AC / DC circuit. The output end of the AC / DC circuit is connected to the charging circuit, and the charging circuit is connected to a charging interface of the energy storage power supply.

[0020] The photovoltaic module belongs to the prior art. The electrical energy collected and converted is promptly converted into alternating current through an AC / DC circuit, and then the alternating current passes through the charging circuit to charge the energy storage power supply (battery). When there is insufficient sunlight and the power of the energy storage power supply is low, at this time, the mains power is used to charge the energy storage power supply through the charging circuit to supplement the electrical energy and prevent abnormal power supply to the circuit control board.

[0021] The circuit control board is provided with a primary side DSP and a control circuit, as well as a secondary side DSP and a control circuit. The primary side DSP and the control circuit, and the secondary side DSP and the control circuit are respectively used to regulate the AC / DC circuit and the constant-current AC / DC circuit. The DSP and the control circuit are used to regulate whether the AC / DC circuit and the constant-current AC / DC circuit output electrical energy. For example, at night, the AC / DC circuit is turned off and weak charging is not performed. When the mains power is supplied, the constant-current AC / DC circuit is turned off. The above technologies can all be completed through the prior art. The primary side DSP and the control circuit, and the secondary side DSP and the control circuit all belong to the prior art and will not be described here.

[0022] The bidirectional converter includes a transformer winding group and an inverter circuit. The transformer winding group includes a positive winding group and a secondary winding group. One side of the secondary winding group is connected with an output wire at the end, and the other side is connected with three output wires at intervals from the end to the inside, and a conversion electrical control switch is provided on each of the three output wires. The three output wires are connected at the output end and then output. One output wire of the secondary winding group and the three output wires are respectively connected to two interfaces at the input end of the inverter circuit.

[0023] The other side is connected with three output wires at intervals from the end to the inside. By turning on different conversion electrical control switches Q0, the regulation of different output voltage and current can be realized for these three output wires.

[0024] The inverter circuit includes two groups, each group consisting of two forward diodes connected in series and a capacitor. The circuits of the two groups of forward diodes connected in series are connected in parallel and then output, and a capacitor is provided on the output circuit. First inverter switching switches are provided on both output lines of the secondary winding group, and second inverter switching switches are provided on both output circuits of the parallel-connected circuits of the forward diode series circuits. The first of the first inverter switching switches is electrically connected to the first of the second inverter switching switches, and the second of the first inverter switching switches is electrically connected to the second of the second inverter switching switches.

[0025] The forward diodes are connected in series and an output wire is connected at the middle position. The alternating current output by the output wire can only be output from one diode, achieving the purpose of converting alternating current to direct current.

[0026] When alternating current needs to be output, the output circuit of the parallel-connected circuits of the forward diode series circuits needs to be cancelled, that is, the circuit composed of four diodes (D1 / D2 / D3 / D4). The first inverter switching switch Q1 and the first of the second inverter switching switches Q2 are turned on, and the second of the first inverter switching switches and the second of the second inverter switching switches are turned on, while the output circuit of the parallel-connected circuits of the forward diode series circuits will be in an open circuit. Thus, direct alternating current output is achieved. The first inverter switching switch and the second inverter switching switch are controlled and switched by a circuit control board.

[0027] The input end of the positive winding group is electrically connected to the output end of the switching switch. The input end of the switching switch is a switching electro-controlled bidirectional switch for switching conversion.

[0028] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-precision bidirectional converter for green energy storage and circulation, characterized in that: It includes a photovoltaic energy storage unit, an energy storage power supply, a circuit control board, a current-stabilizing AC / DC circuit and a bidirectional converter. The photovoltaic energy storage unit charges electric energy through a charging interface of the energy storage power supply. The energy storage power supply converts the direct current of the energy storage power supply into stable alternating current through the current-stabilizing AC / DC circuit. Another charging interface of the energy storage power supply is connected to the charging circuit through the mains for charging. The output end of the current-stabilizing AC / DC circuit and the mains output end are switched and connected with a switching switch. The output end of the switching switch is connected to the input end of the bidirectional converter. The energy storage power supply supplies power to the circuit control board. The circuit control board is used to regulate the photovoltaic energy storage unit, the current-stabilizing AC / DC circuit, the switching switch and the bidirectional converter.

2. A high-precision bidirectional converter for green energy storage and circulation according to claim 1, characterized in that: The photovoltaic energy storage unit includes a photovoltaic module, an AC / DC circuit and a charging circuit. The light energy collected by the photovoltaic module is converted into DC power and then converted into AC power through the AC / DC circuit. The output end of the AC / DC circuit is connected to the charging circuit and the charging circuit is connected to a charging interface of the energy storage power supply.

3. A high-precision bidirectional converter for green energy storage and circulation according to claim 2, characterized in that: The circuit control board is provided with a primary DSP and a control circuit and a secondary DSP and a control circuit, and the primary DSP and the control circuit and the secondary DSP and the control circuit are used for regulating the AC / DC circuit and the current-stabilizing AC / DC circuit respectively.

4. A high-precision bidirectional converter for green energy storage and circulation according to claim 1, characterized in that: The bidirectional converter comprises a transformer winding group and an inverter circuit, wherein the transformer winding group comprises a positive winding group and a secondary winding group, wherein one side of the secondary winding group is connected with an output wire at the end, and the other side is connected with three output wires at intervals from the end to the inside, and each of the three output wires is provided with a conversion electronically controlled switch, and the three output wires are output after being connected at the output end, and an output wire of the secondary winding group and three output wires are respectively connected with two interfaces at the input end of the inverter circuit.

5. A high-precision bidirectional converter for green energy storage and circulation according to claim 4, characterized in that: The inverter circuit includes two groups of two unidirectional diodes connected in series and a capacitor. The two groups of circuits of the unidirectional diodes connected in series are connected in parallel for output, and a capacitor is provided on the output circuit. A first inverter switching switch is provided on the two output lines of the secondary winding group, and a second inverter switching switch is provided on the two output circuits of the unidirectional diode series circuit connected in parallel. The first of the first inverter switching switches is electrically connected to the first of the second inverter switching switches, and the second of the first inverter switching switch is electrically connected to the second of the second inverter switching switches.

6. A high-precision bidirectional converter for green energy storage and circulation according to claim 4, characterized in that: The input end of the positive winding group is electrically connected to the output end of the switching switch, and the input end of the switching switch is a switching electronically controlled bidirectional switch.

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