Photovoltaic inverter system for waking up battery management system through power grid

Abstract

The utility model discloses a photovoltaic inverter system for awakening a battery management system through a power grid. The photovoltaic inverter system comprises a flyback power supply module, a resistor, a diode, a battery and an auxiliary power supply of a photovoltaic inverter, the input end of the flyback power supply module is connected to a power grid and used for taking power from the power grid, the output end of the flyback power supply module is connected with one end of the resistor, the other end of the resistor is connected with the anode of the diode, and the cathode of the diode is connected with the battery; the input end of the auxiliary power supply of the photovoltaic inverter is connected with the battery and is used for taking electricity from the battery, and the output end of the auxiliary power supply of the photovoltaic inverter is connected with the photovoltaic inverter and is used for enabling the photovoltaic inverter to enter a working state.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic hybrid inverters, and in particular relates to a photovoltaic inverter system for waking up a battery management system through a power grid. Background Art

[0002] In the fields of electric vehicles, energy storage systems, etc., the battery management system (BMS) is crucial. Traditionally, the battery management system (BMS) usually relies on battery power or external trigger signals to wake up. The existing photovoltaic inverters on the market lack the function of waking up the battery management system (BMS) through the grid (AC). When the photovoltaic inverter transmits electricity to the grid through the battery, the battery has been discharged after a night, and the photovoltaic inverter is in a shutdown state. The photovoltaic module cannot power the photovoltaic inverter at night, and it is impossible to get power from the grid (AC) to wake up the photovoltaic inverter.

[0003] To solve the problem that the PV inverter cannot be awakened by power from the grid (AC), existing solutions include Figure 1 As shown, the grid side (AC) charges the high-voltage bus through a switching power supply, starts the inverter auxiliary power supply, and then wakes up the battery management system (BMS) through a bidirectional DC buck-boost circuit, thereby waking up the entire inverter system.

[0004] Figure 1 The existing solutions shown have the following disadvantages:

[0005] (1) The cost of flyback power supply module is high: Figure 1 It can be seen that the control signal starts the flyback power supply module, and the flyback power supply module outputs to the high-voltage bus through the diode D2. The flyback power supply module also needs to maintain the working power of the inverter auxiliary power supply. Therefore, the power required for the entire startup process is large, the output voltage is high, and the cost is high;

[0006] (2) The power-on and power-off logic of the inverter auxiliary power supply is relatively complex and has poor reliability. Utility Model Content

[0007] Purpose of the utility model: To solve the problem that when the photovoltaic inverter is working at night, the photovoltaic module cannot supply power to the photovoltaic inverter and the battery has been discharged, the photovoltaic inverter is shut down due to low battery voltage, and the power grid cannot be used to activate the photovoltaic inverter to work. The utility model discloses a photovoltaic inverter system that wakes up the battery management system through the power grid. By using an AC power supply to trigger the wake-up signal of the battery management system, the function of automatically starting the photovoltaic inverter is realized when only the power grid is powered.

[0008] Technical solution: The utility model discloses a photovoltaic inverter system for waking up a battery management system through a power grid, including a flyback power supply module, a resistor, a diode, a battery and an auxiliary power supply of a photovoltaic inverter;

[0009] The input end of the flyback power supply module is connected to the power grid for drawing power from the power grid, the output end of the flyback power supply module is connected to one end of the resistor, the other end of the resistor is connected to the positive electrode of the diode, and the negative electrode of the diode is connected to the battery; the input end of the auxiliary power supply of the photovoltaic inverter is connected to the battery for drawing power from the battery, and the output end of the auxiliary power supply of the photovoltaic inverter is connected to the photovoltaic inverter for putting the photovoltaic inverter into working state.

[0010] Furthermore, it also includes a control module, which is connected to the flyback power supply module and is used to shut down the flyback power supply module after the photovoltaic inverter works normally.

[0011] Furthermore, the flyback power supply module is a module that converts 220V, 50Hz alternating current into 24V, 100mA direct current.

[0012] Furthermore, the resistance value of the resistor is 100Ω.

[0013] Beneficial effect: Compared with the prior art, the utility model uses a flyback power supply module to draw power from the power grid to wake up the battery management system, and then draws power from the battery to start the auxiliary power supply of the inverter to draw power from the battery, thereby achieving startup and putting the photovoltaic hybrid inverter into working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A block diagram of the existing solution for realizing the inverter wake-up system;

[0015] Figure 2 The utility model provides a block diagram of a photovoltaic inverter system for waking up a battery management system through a power grid. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is now further described in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 2 As shown, this embodiment proposes a photovoltaic inverter system for waking up a battery management system through a power grid, which mainly includes: a control module, a flyback power module, a resistor R1, a diode D2 and a battery (BAT). The flyback power module used in this embodiment is a commercially available flyback power module.

[0018] The flyback power module of this embodiment is used to convert the power taken from the power grid into 24V 100mA direct current. The power grid mentioned in this embodiment refers to 220V 50Hz alternating current. The flyback power module first converts the alternating current into direct current, and then the direct current is provided to the battery management system, and the isolated power supply is safer and more reliable.

[0019] One end of the resistor R1 is connected to the output end of the flyback power module, and the other end of the resistor R1 is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the battery (BAT) in the battery management system. The value of the resistor R1 is 100Ω, which is used to limit the current output by the flyback power module. By adding a current limiting resistor, it can ensure that the battery management system safely receives the power signal. The diode D2 is used to prevent the battery (BAT) voltage from backflowing. By adding a diode to prevent backflow, it is used to prevent the battery from discharging reversely to the flyback power module, protecting the components in the circuit from damage.

[0020] Among them, the battery (BAT) of this embodiment is used to activate the battery management system with the 24V 100mA direct current output by the flyback power module, so that the photovoltaic hybrid inverter can work, specifically: through the flyback power module, power is taken from the power grid, converted into direct current and then input into the battery, and the auxiliary power supply of the inverter is started from the battery, so that the photovoltaic hybrid inverter enters the working state. This embodiment connects the designed circuit components to the battery management system to ensure that it can be seamlessly connected with the existing battery management system to achieve wake-up when needed. When the battery management system is successfully awakened, the battery management system is successfully activated, which means that: after an external electrical signal is given to the BMS system, the system will start working, and the battery can be charged and discharged; the battery supplies power to the control module (DSP), and when the inverter works normally, the control module (DSP) outputs a signal to shut down the flyback power module.

[0021] The circuit designed in this embodiment is tested to verify its performance and reliability, and the test includes monitoring the status of the flyback power module and verifying whether the battery management system is successfully awakened. Through the test verification, the circuit designed in this embodiment can successfully wake up the battery management system.

Claims

1. A photovoltaic inverter system for waking up a battery management system through a power grid, characterized in that: An auxiliary power supply including a flyback power module, a resistor, a diode, a battery and a photovoltaic inverter; The input end of the flyback power supply module is connected to the power grid for drawing power from the power grid, the output end of the flyback power supply module is connected to one end of the resistor, the other end of the resistor is connected to the positive electrode of the diode, and the negative electrode of the diode is connected to the battery; the input end of the auxiliary power supply of the photovoltaic inverter is connected to the battery for drawing power from the battery, and the output end of the auxiliary power supply of the photovoltaic inverter is connected to the photovoltaic inverter for putting the photovoltaic inverter into working state.

2. A photovoltaic inverter system for waking up a battery management system through a power grid according to claim 1, characterized in that: The system also includes a control module, which is connected to the flyback power supply module and is used to shut down the flyback power supply module after the photovoltaic inverter operates normally.

3. A photovoltaic inverter system for waking up a battery management system through a power grid according to claim 1, characterized in that: The flyback power supply module is a module that converts 220V, 50Hz alternating current into 24V, 100mA direct current.

4. A photovoltaic inverter system for waking up a battery management system through a power grid according to claim 1, characterized in that: The resistance value of the resistor is 100Ω.

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