Photovoltaic energy storage and charging integrated circuit and charging robot using same

Abstract

The utility model discloses a photovoltaic energy storage and charging integrated circuit and a charging robot applying the same. The circuit comprises a main control module, an input interface, an energy storage battery pack and a direct current bus output interface, the input interface is connected with a photovoltaic direct current input end, a mains supply alternating current input end and a photovoltaic charging controller, and the photovoltaic charging controller converts a photovoltaic input signal accessed by the photovoltaic direct current input end into a controllable direct current output signal; the mains supply alternating current input end converts a mains supply alternating current signal into a direct current output signal through the alternating current-to-direct current module; the energy storage battery pack is connected with the photovoltaic DC input end and the commercial power AC input end through the bidirectional DC-to-DC module; the direct current bus output interface integrates a photovoltaic direct current input end, a mains supply alternating current input end and direct current output of the energy storage battery pack, and provides controllable direct current charging for an external load; and the main control module coordinates the work of each module and supports an automatic switching electricity supplementing and discharging strategy based on a peak-valley electricity price period. The electric energy loss is reduced, and the charging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging, in particular to a photovoltaic energy storage and charging integrated circuit and a charging robot applying the same. BACKGROUND

[0002] With the increasing demand for renewable energy, how to provide an efficient, flexible and economical charging device; traditional charging stations mainly rely on AC input from the power grid and provide DC charging services for electric vehicles through multiple conversion steps, however, this traditional method has the problems of low energy conversion efficiency, high operating cost and great influence on power grid stability.

[0003] Especially in distributed and centralized charging station fields, how to effectively integrate photovoltaic, energy storage systems and charging facilities has become a problem to be solved; the existing technology usually adopts an AC bus connection mode to connect various components, but the AC bus connection mode will undergo multiple conversion processes from AC to DC in the energy conversion process, resulting in increased energy loss and reduced overall charging system efficiency. CONTENT OF THE INVENTION

[0004] In order to reduce power loss and improve charging efficiency, the application provides a photovoltaic energy storage and charging integrated circuit and a charging robot applying the same.

[0005] In the first aspect, the application provides a photovoltaic energy storage and charging integrated circuit, which adopts the following technical scheme:

[0006] A photovoltaic energy storage and charging integrated circuit, comprising a main control module, an input interface, an energy storage battery pack, and a DC bus output interface;

[0007] The main control module is connected with the input interface, the energy storage battery pack and the DC bus output interface in sequence;

[0008] The input interface is connected with a photovoltaic DC input end, an AC input end of the power grid and a photovoltaic charging controller, the photovoltaic charging controller converts a photovoltaic input signal connected by the photovoltaic DC input end into a controllable DC output signal; the AC input end of the power grid converts an AC signal of the power grid into a DC output signal through an AC-DC module;

[0009] The energy storage battery pack is connected with the photovoltaic DC input end and the AC input end of the power grid through a bidirectional DC-DC module;

[0010] The DC bus output interface integrates the DC outputs of the photovoltaic DC input end, the AC input end of the power grid and the energy storage battery pack, and provides a controllable DC charging for an external load through a charging module;

[0011] The master module coordinates the work of each module and supports automatic switching of power supply and discharge strategies based on peak and valley electricity price periods.

[0012] By adopting the above technical solutions, the AC-DC module, the bidirectional DC-DC module, the DC bus integrated architecture, the traditional AC-DC conversion environment is omitted, the power loss is reduced, that is, the controllable DC charging is directly provided to the external load through the efficient DC bus, thereby reducing the number of energy conversion; at the same time, the dynamic switching of the integrated photovoltaic DC, commercial AC and energy storage battery pack is supported, the three power supply modes are coordinated in real time by the master module, to ensure the continuity and stability of the external load power supply, especially when the power grid is abnormal or the renewable energy fluctuates, the reliable output can still be maintained, and the charging efficiency is improved and the energy storage economy is optimized; the automatic switching strategy based on the peak and valley electricity price period intelligently controls the charging and discharging sequence of the energy storage battery pack (such as preferentially charging with low-price valley electricity and discharging to supplement power in peak period), which not only reduces the user's electricity cost, but also prolongs the cycle life of the energy storage battery pack.

[0013] Preferably, two charging modules are provided, and the charging modules are connected with charging guns.

[0014] By adopting the above technical solutions, the application provides a double-charging gun setting, which can provide charging services for multiple external loads (such as electric vehicles and electric tools) and meet high-concurrency power demand.

[0015] Preferably, a three-phase AC protection contactor is connected between the commercial AC input end and the charging module, a DC input protection contactor is connected between the energy storage battery pack and the charging module, and the three-phase AC protection contactor and the DC input protection contactor are electrically interlocked.

[0016] By adopting the above technical solutions, the three-phase AC protection contactor and the DC input protection contactor are interlocked, which ensures that the commercial power input and the energy storage battery pack power supply cannot be turned on at the same time, effectively avoiding the risk of short circuit.

[0017] Preferably, the energy storage battery pack is connected with a DC power supplement contactor, the charging gun is connected with a charging contactor, and the DC power supplement contactor and the charging contactor are electrically interlocked.

[0018] By adopting the above technical solutions, the DC power supplement contactor only allows the energy storage battery pack to discharge to the external equipment (power supplement mode), the charging contactor only allows the external equipment to charge the energy storage battery pack, the bidirectional operation is physically isolated, and at the same time, during the peak and valley electricity price period of the power grid, the master module can preferentially enable the energy storage battery pack to discharge (in peak period) or charge (in valley period) through the interlocking mechanism, to realize economic operation and efficient optimization management of electric energy.

[0019] Preferably, a shunt and a charging gun contactor are connected between the charging gun and the charging module, the shunt is connected with the master control module and outputs a current shunt detection signal.

[0020] By adopting the above technical solution, the shunt accurately collects current data of two charging guns, the master control module dynamically adjusts charging power distribution according to the current size (such as preferentially allocating more current to high-power equipment), and at the same time, the master control module can also identify the type of charging equipment (such as the type of electric vehicle) through the feedback signal of the shunt, automatically adapt the charging protocol (such as CC / CV mode), and immediately disconnect the charging gun contactor when overcurrent or battery abnormality of the charging gun is detected, to prevent fault propagation.

[0021] Preferably, the energy storage battery pack is connected with a cooling fan and a cooling fan contactor, a control switch of the cooling fan is connected in series with a coil of the cooling fan contactor, and the cooling fan contactor is connected with the master control module to receive a switch control instruction from the master control module.

[0022] By adopting the above technical solution, the cooling fan is used for cooling the energy storage battery pack, and the cooling fan and the cooling fan contactor are independent of the main circuit, so that the normal work of the energy storage battery pack is not affected when a fault occurs.

[0023] Preferably, the master control module is connected with a kilowatt-hour meter, and the kilowatt-hour meter measures input and output kilowatt-hours.

[0024] By adopting the above technical solution, the kilowatt-hour meter is used for real-time statistics of input and output kilowatt-hours of photovoltaic and mains.

[0025] Preferably, the master control module is connected with a lightning protection device, a circuit breaker and a fuse.

[0026] By adopting the above technical solution, the lightning protection device is used for intercepting lightning surge current, the circuit breaker is used for responding to continuous overload or short-circuit fault, and the fuse is used as a backup protection means, thereby providing a multi-level safety protection mechanism for the charging system through the lightning protection device, the circuit breaker and the fuse.

[0027] Preferably, the master control module is connected with a three-phase alternating current input contactor and a three-phase power supply contactor at the mains alternating current input end, and the master control module is further connected with an IO expansion module.

[0028] By adopting the above technical solution, the three-phase alternating current input contactor supports three-phase power supply access of the mains, the three-phase power supply contactor allows the energy storage battery pack to supply power to three-phase loads in reverse, the master control module automatically switches the power supply mode based on the mains state through the three-phase alternating current input contactor and the three-phase power supply contactor, the IO expansion module provides a standard communication interface, and new functions can be added through the expansion module.

[0029] In a second aspect, the application provides a charging robot, which adopts the technical scheme as follows:

[0030] A charging robot comprises a shell and a circuit board, the circuit board is installed in the shell, and the circuit board carries a photovoltaic energy storage charging integrated circuit as described above.

[0031] In summary, the application has at least one of the following beneficial technical effects:

[0032] 1. The direct current bus integrated architecture is adopted, the traditional alternating current-direct current conversion environment is saved, and the power loss is reduced, that is, the controllable direct current charging is directly provided to the external load through the efficient direct current bus, so that the number of energy conversion times is reduced; and the dynamic switching of the three power supply modes of photovoltaic direct current, commercial alternating current and energy storage battery pack is supported.

[0033] 2. In the peak and valley electricity price period, the main control module can preferentially start the discharge (peak period) or charging (valley period) of the energy storage battery pack through the interlocking mechanism, so as to realize economic operation.

[0034] 3. The lightning protection device, circuit breaker and fuse provide a multi-level safety protection mechanism for the charging system. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is one of the circuit diagrams of a photovoltaic energy storage charging integrated circuit according to the embodiment 1 of the application.

[0036] Figure 2 is a circuit diagram of another part of a photovoltaic energy storage charging integrated circuit according to the embodiment 1 of the application.

[0037] Figure 3 is a structural diagram of a charging robot according to the embodiment 2 of the application.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 1. Main control module; 2. Photovoltaic direct current input end; 3. Commercial alternating current input end; 4. Energy storage battery pack; 5. Charging module; 6. Charging gun; 7. Cooling fan. DETAILED DESCRIPTION

[0040] The following will be described in detail in combination with the accompanying Figures 1-3 The application will be further described in detail.

[0041] Embodiment 1

[0042] The embodiment of the application discloses a photovoltaic energy storage charging integrated circuit. Referring to Figure 1 and Figure 2The photovoltaic energy storage charging integrated circuit comprises a main control module 1, an input interface, an energy storage battery pack 4, and a direct current bus output interface; the main control module 1 is connected with the input interface, the energy storage battery pack 4, and the direct current bus output interface in sequence; the main control module 1 comprises an STM32H7 chip or an ADUCM3029 chip; the input interface is connected with a photovoltaic direct current input end 2, a commercial alternating current input end 3, and a photovoltaic charging controller (MPPT in the figure); the photovoltaic charging controller converts a photovoltaic input signal connected with the photovoltaic direct current input end 2 into a controllable direct current output signal; the commercial alternating current input end 3 converts a commercial alternating current signal into a direct current output signal through an alternating current to direct current module; the energy storage battery pack 4 is connected with the photovoltaic direct current input end 2 and the commercial alternating current input end 3 through a bidirectional direct current to direct current module; the direct current bus output interface integrates direct current outputs of the photovoltaic direct current input end 2, the commercial alternating current input end 3, and the energy storage battery pack 4, and provides a controllable direct current charging for an external load through a charging module 5; the main control module 1 coordinates work of each module, and supports an automatic switching power compensation and discharging strategy based on peak-valley electricity price time periods.

[0043] Referring to Figure 1 and Figure 2 , for example, the circuit diagram shown in Figure 1 and Figure 2 , the main control module 1 is connected with a three-phase alternating current input contactor and a three-phase power compensation contactor; a three-phase alternating current protection contactor KM11 is connected between the commercial alternating current input end 3 and the charging module 5; a direct current input protection contactor KM12 is connected between the energy storage battery pack 4 and the charging module 5; the three-phase alternating current protection contactor KM11 and the direct current input protection contactor KM12 are electrically interlocked; the energy storage battery pack 4 is connected with a direct current power compensation contactor KM13; a charging gun 6 is connected with a charging contactor KM1; the direct current power compensation contactor KM13 and the charging contactor KM1 are electrically interlocked; the main control module 1 is connected with a watt-hour meter; the watt-hour meter measures input and output watt-hours; the main control module 1 is also connected with an IO expansion module for input and output expansion; the main control module 1 is connected with a lightning protection device SPD, a circuit breaker QF, a fuse FU, and a detection board JCB; the lightning protection device SPD, the circuit breaker QF, and the fuse FU are respectively provided with a plurality of lightning protection devices, circuit breakers, and fuses in Figure 1 and Figure 2 ; the charging module 5 is provided with two charging modules 5; the charging module 5 is connected with a charging gun 6;

[0044] Referring to Figure 1 and Figure 2 , for example, the circuit diagram shown in Figure 1 and Figure 2As shown in the circuit diagram, the charging gun 6 is connected with the shunt TS and the charging gun contactor between the charging module 5, the shunt TS is connected with the main control module 1, and outputs the current shunt detection signal; the energy storage battery pack 4 is connected with the cooling fan 7 and the cooling fan contactor, the control switch of the cooling fan 7 is connected with the coil of the cooling fan contactor in series, the cooling fan contactor is connected with the main control module 1, and receives the switch control instruction from the main control module 1.

[0045] The implementation principle of the photovoltaic energy storage and charging integrated circuit in the embodiment of the application is as follows: the photovoltaic energy storage and charging integrated circuit adopts a direct-current bus integrated architecture, saves the traditional alternating-current-direct-current conversion environment, reduces power loss, that is, controllable direct-current charging is directly provided to external loads through the high-efficiency direct-current bus, so that the number of energy conversion times is reduced; and dynamic switching of three power supply modes, photovoltaic direct current, commercial alternating current and the energy storage battery pack 4, is supported.

[0046] Embodiment 2

[0047] The application further discloses a charging robot.

[0048] As Figure 3 shown, the embodiment of the application discloses a charging robot, which comprises a shell and a circuit board, the circuit board is installed in the shell, and the circuit board carries a photovoltaic energy storage and charging integrated circuit.

[0049] The above are preferred embodiments of the application, and are not intended to limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A photovoltaic energy storage and charging integrated circuit, characterized in that, The application relates to a photovoltaic energy storage charging integrated circuit, which comprises a master control module (1), an input interface, an energy storage battery pack (4) and a direct-current bus output interface. The master control module (1) is sequentially connected with the input interface, the energy storage battery pack (4) and the direct-current bus output interface. The input interface is connected with a photovoltaic direct-current input end (2), a commercial power alternating-current input end (3) and a photovoltaic charging controller; the photovoltaic charging controller converts a photovoltaic input signal connected with the photovoltaic direct-current input end (2) into a controllable direct-current output signal; the commercial power alternating-current input end (3) converts commercial power alternating-current signals into direct-current output signals through an alternating-current to direct-current module; The energy storage battery pack (4) is connected with the photovoltaic direct-current input end (2) and the commercial power alternating-current input end (3) through a bidirectional direct-current to direct-current module; The direct-current bus output interface integrates direct-current outputs of the photovoltaic direct-current input end (2), the commercial power alternating-current input end (3) and the energy storage battery pack (4), and provides controllable direct-current charging for external loads through a charging module (5); The master control module (1) coordinates the work of various modules and supports automatic switching power supply and discharging strategies based on peak-valley electricity price periods.

2. The photovoltaic energy storage and charging integrated circuit according to claim 1, characterized in that, The charging module (5) is provided with two charging guns (6).

3. The photovoltaic energy storage and charging integrated circuit according to claim 2, characterized in that, A three-phase alternating-current protection contactor is connected between the commercial power alternating-current input end (3) and the charging module (5), a direct-current input protection contactor is connected between the energy storage battery pack (4) and the charging module (5), and the three-phase alternating-current protection contactor and the direct-current input protection contactor are electrically interlocked.

4. The photovoltaic energy storage and charging integrated circuit according to claim 2, characterized in that, The energy storage battery pack (4) is connected with a direct-current power supply contactor, the charging gun (6) is connected with a charging contactor, and the direct-current power supply contactor and the charging contactor are electrically interlocked.

5. The photovoltaic energy storage and charging integrated circuit according to claim 2, characterized in that, A shunt and a charging gun contactor are connected between the charging gun (6) and the charging module (5), the shunt is connected with the master control module (1) and outputs a current shunt detection signal.

6. The photovoltaic energy storage and charging integrated circuit according to claim 1, characterized in that, The energy storage battery pack (4) is connected with a cooling fan (7) and a cooling fan contactor, a control switch of the cooling fan (7) is connected with a coil of the cooling fan contactor in series, the cooling fan contactor is connected with the master control module (1) and receives a switch control instruction from the master control module (1).

7. The photovoltaic energy storage and charging integrated circuit according to claim 1, characterized in that, The master control module (1) is connected with a watt-hour meter, and the watt-hour meter measures input and output electric degrees.

8. The photovoltaic energy storage and charging integrated circuit according to claim 1, characterized in that, The master control module (1) is connected with a lightning protection device, a circuit breaker and a fuse.

9. The photovoltaic energy storage charging integrated circuit of claim 1, wherein, The master control module (1) is connected with a three-phase alternating-current input contactor and a three-phase power supply contactor, and is further connected with an IO expansion module.

10. A charging robot characterized by, The application relates to a photovoltaic energy storage charging integrated circuit, which comprises a master control module (1), an input interface, an energy storage battery pack (4) and a direct-current bus output interface.

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