Wide-voltage battery charging inversion control device and method

Abstract

The invention discloses a wide-voltage battery charging inversion control device which comprises a main control unit, a first bidirectional inversion unit, a second bidirectional inversion unit, a high-frequency transformer and a third bidirectional inversion unit. The output end of the first bidirectional inversion unit is connected to the input end of the second bidirectional inversion unit, the output end of the second bidirectional inversion unit is connected to the input end of the high-frequency transformer, the output end of the high-frequency transformer is connected to the input end of the third bidirectional inversion unit, and the voltage of the output end of the third bidirectional inversion unit is used for charging a battery. The control end of the first bidirectional inversion unit, the control end of the second bidirectional inversion unit and the control end of the third bidirectional inversion unit are respectively connected with the main control unit. On the basis of the big data model, the charging and discharging voltage range is effectively widened, meanwhile, the battery aging speed can be reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present invention relates to a battery charging control device and method, and in particular to a wide voltage battery charging inverter control device and method. Background Art

[0002] For traditional inverters, because they cannot adapt to a wide voltage range, users need to purchase corresponding inverters according to different lithium battery voltage levels; similarly, for battery chargers, different types of chargers must be purchased according to factors such as battery composition, the number of batteries in series and parallel, and capacity. The application cost is high. In addition, the batteries used in traditional electric vehicles such as electric bicycles, RVs, and electric tricycles do not have BMS, or BMS without universal protocols. During the charging and inversion process, there is no way to obtain the internal data of the battery in time, which can easily cause overcharging and over-discharging, which not only affects the battery life, but also accelerates battery aging and even causes battery damage. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wide voltage battery charging inverter control device and method that can meet the working requirements of a wide voltage range, reduce the battery aging speed, and increase the battery life in view of the shortcomings of the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] A wide voltage battery charging inverter control device comprises a main control unit, a first bidirectional inverter unit, a second bidirectional inverter unit, a high frequency transformer and a third bidirectional inverter unit, wherein the input end of the first bidirectional inverter unit is connected to the AC end, the output end of the first bidirectional inverter unit is connected to the input end of the second bidirectional inverter unit, the output end of the second bidirectional inverter unit is connected to the input end of the high frequency transformer, the output end of the high frequency transformer is connected to the input end of the third bidirectional inverter unit, the output end voltage of the third bidirectional inverter unit is used to charge the battery, and the control end of the first bidirectional inverter unit, the control end of the second bidirectional inverter unit and the control end of the third bidirectional inverter unit are respectively connected to the main control unit.

[0006] Preferably, the main control unit is connected to a WiFi unit, and the main control unit receives preset battery model data through the WiFi unit, and the main control unit controls the output voltages of the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit according to the battery model data.

[0007] Preferably, an AC voltage sampling unit is included, and the AC voltage sampling unit is connected between the AC terminal and the main control unit. The AC voltage sampling unit is used to collect the AC terminal voltage and transmit it to the main control unit.

[0008] Preferably, a current sensor is included, and the current sensor is arranged at the input end of the first bidirectional inverter unit. The current sensor is used to collect the current at the input end of the first bidirectional inverter unit and transmit it to the main control unit.

[0009] Preferably, a Hall current sensor is included, and the Hall current sensor is arranged at the output end of the third bidirectional inverter unit. The Hall current sensor is used to collect the current at the output end of the third bidirectional inverter unit and transmit it to the main control unit.

[0010] Preferably, it includes a DC voltage sampling unit, which is connected between the output end of the third bidirectional inverter unit and the main control unit, and is used to collect the voltage at the output end of the third bidirectional inverter unit and transmit it to the main control unit.

[0011] Preferably, it includes a first isolation drive unit, a second isolation drive unit and a third isolation drive unit, the first isolation drive unit is connected between the control end of the first bidirectional inverter unit and the main control unit, the second isolation drive unit is connected between the control end of the second bidirectional inverter unit and the main control unit, and the third isolation drive unit is connected between the control end of the third bidirectional inverter unit and the main control unit.

[0012] Preferably, it comprises a speaker unit, a display unit and a communication interface connected to the main control unit.

[0013] A wide voltage battery charging inverter control method, the method is implemented based on the above-mentioned device, the method includes: a charging and discharging control process, the main control unit controls the output voltage of the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit according to battery model data containing charging voltage data and charging current data; a data downloading and correction process, the main control unit downloads the battery model data and processes and analyzes it to obtain the charging voltage data and charging current data; an alarm and adjustment process, when the main control unit detects that the battery reaches the set charging and discharging voltage and current thresholds, the output state of the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit is adjusted.

[0014] Preferably, in the alarm and adjustment process: when the charge and discharge voltage of the battery reaches a set alarm threshold, the main control unit issues an alarm prompt; when the charge and discharge current of the battery reaches a set current threshold, the main control unit controls the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit to reduce the charge and discharge current; when the charge and discharge current of the battery reaches a set stop threshold, the main control unit controls the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit to stop working.

[0015] The wide voltage battery charging inverter control device disclosed in the present invention can perform charging and discharging control, data download and correction, or alarm and adjustment according to the battery charging and discharging state during operation. In normal charging and discharging, the main control unit controls the output voltage of the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit according to the battery model data containing charging voltage data and charging current data, so that the battery reaches the specified charging and discharging state. As the basis for charging and discharging control, the main control unit needs to download the battery model data and process and analyze it, and then obtain the charging voltage data and charging current data, and control and adjust the state of each inverter unit accordingly. When the battery charging and discharging state is abnormal, corresponding alarms and adjustments can be made, that is, when the main control unit detects that the battery reaches the set charging and discharging voltage and current thresholds, the output state of the first bidirectional inverter unit, the second bidirectional inverter unit and the third bidirectional inverter unit is adjusted. Based on the above principle, it can be seen that the present invention is based on the big data model, effectively broadens the charging and discharging voltage range, and can reduce the battery aging speed, thereby improving the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the wide voltage battery charging inverter control device of the present invention;

[0017] Figure 2 This is a flow chart of the wide voltage battery charging inverter control method of the present invention. DETAILED DESCRIPTION

[0018] The present invention is described in more detail below with reference to the accompanying drawings and embodiments.

[0019] The present invention discloses a wide voltage battery charging inverter control device, see Figure 1, which includes a main control unit 1, a first bidirectional inverter unit 2, a second bidirectional inverter unit 3, a high-frequency transformer 4 and a third bidirectional inverter unit 5, the input end of the first bidirectional inverter unit 2 is connected to the AC end, the output end of the first bidirectional inverter unit 2 is connected to the input end of the second bidirectional inverter unit 3, the output end of the second bidirectional inverter unit 3 is connected to the input end of the high-frequency transformer 4, the output end of the high-frequency transformer 4 is connected to the input end of the third bidirectional inverter unit 5, the output end voltage of the third bidirectional inverter unit 5 is used to charge the battery 6, and the control end of the first bidirectional inverter unit 2, the control end of the second bidirectional inverter unit 3 and the control end of the third bidirectional inverter unit 5 are respectively connected to the main control unit 1.

[0020] During operation, the above device can perform charge and discharge control, data download and correction, or alarm and adjustment according to the battery charge and discharge state. In normal charge and discharge, the main control unit 1 controls the output voltage of the first bidirectional inverter unit 2, the second bidirectional inverter unit 3, and the third bidirectional inverter unit 5 according to the battery model data containing the charging voltage data and the charging current data, so that the battery 6 reaches the specified charge and discharge state. As the basis for charge and discharge control, the main control unit 1 needs to download the battery model data and process and analyze it, and then obtain the charging voltage data and the charging current data, and control and adjust the state of each inverter unit accordingly. When the battery charge and discharge state is abnormal, corresponding alarms and adjustments can be made, that is, when the main control unit 1 detects that the battery 6 reaches the set charge and discharge voltage and current thresholds, the output state of the first bidirectional inverter unit 2, the second bidirectional inverter unit 3, and the third bidirectional inverter unit 5 is adjusted. Based on the above principle, it can be seen that the present invention is based on the big data model, effectively broadens the charge and discharge voltage range, and can reduce the battery aging speed, thereby improving the battery life.

[0021] In this embodiment, the main control unit 1 communicates with the upper control system or the preset server to download battery model data including charging voltage data and charging current data. In order to achieve reliable data download, in this embodiment, the main control unit 1 is connected to the WiFi unit 7. The main control unit 1 receives the preset battery model data through the WiFi unit 7. The main control unit 1 controls the output voltage of the first bidirectional inverter unit 2, the second bidirectional inverter unit 3 and the third bidirectional inverter unit 5 according to the battery model data.

[0022] To realize the voltage sampling function of AC terminal, please refer to Figure 1This embodiment includes an AC voltage sampling unit 8, which is connected between the AC terminal and the main control unit 1. The AC voltage sampling unit 8 is used to collect the AC terminal voltage and transmit it to the main control unit 1.

[0023] Accordingly, in order to obtain the current state of the AC alternating current end, the present embodiment includes a current sensor 9, which is arranged at the input end of the first bidirectional inverter unit 2, and is used to collect the current at the input end of the first bidirectional inverter unit 2 and transmit it to the main control unit 1. The AC voltage sampling unit 8 and the current sensor 9 need to be transmitted to the main control unit 1 after a series of signal conversion and processing.

[0024] Further, at the output side of the wide voltage battery charging inverter control device of this embodiment, see Figure 1 , including a Hall current sensor 10, which is arranged at the output end of the third bidirectional inverter unit 5, and is used to collect the current at the output end of the third bidirectional inverter unit 5 and transmit it to the main control unit 1.

[0025] At the same time, the present invention also needs to collect the voltage state of the battery end. To this end, this embodiment includes a DC voltage sampling unit 11, which is connected between the output end of the third bidirectional inverter unit 5 and the main control unit 1. The DC voltage sampling unit 11 is used to collect the voltage at the output end of the third bidirectional inverter unit 5 and transmit it to the main control unit 1.

[0026] In this embodiment, the main control unit 1 preferably adopts an isolated driving method to drive and control each inverter unit. Figure 1 This embodiment includes a first isolation drive unit 12, a second isolation drive unit 13 and a third isolation drive unit 14. The first isolation drive unit 12 is connected between the control end of the first bidirectional inverter unit 2 and the main control unit 1, the second isolation drive unit 13 is connected between the control end of the second bidirectional inverter unit 3 and the main control unit 1, and the third isolation drive unit 14 is connected between the control end of the third bidirectional inverter unit 5 and the main control unit 1.

[0027] In the above control device, the bidirectional inverter adopts a three-level topology architecture, namely the first-level inverter DC (PFC), the second-level high-voltage DC / DC, and the third-level low-voltage DC / DC. By adjusting the DCDC voltage of the intermediate level, it can adapt to a wide range of battery voltages and realize input and output control of charging and inversion at the same time.

[0028] Regarding control, this embodiment uses Wifi to place the battery model big data into the MCU and can update it in real time. During the working process, state learning is performed through multiple manual interferences (buttons, Wifi input commands, etc.), so that the device has the effect of simulating BMS, and with long-term use, its control accuracy becomes higher and higher.

[0029] For specific adjustment and alarm process, please refer to Figure 2 , mainly involving three states:

[0030] When charging, the battery voltage change slope, current, and power are detected, and the integrated big data model is used to promptly alarm and adjust the charging current and charging speed to protect the battery.

[0031] When in the discharge state, the voltage change slope, current and power of the battery are detected, and the integrated big data model is used to give timely alarms and adjust the output voltage of the charging inverter to reduce the output power, thereby protecting the battery.

[0032] In order to realize the auxiliary alarm prompt and communication functions, this embodiment includes a speaker unit 15 , a display unit 16 and a communication interface 17 connected to the main control unit 1 .

[0033] On this basis, the present invention relates to a wide voltage battery charging inverter control method, which is implemented based on the above-mentioned device and combined with Figure 1 and Figure 2 As shown, the method includes:

[0034] In the charging and discharging control process, the main control unit 1 controls the output voltages of the first bidirectional inverter unit 2, the second bidirectional inverter unit 3 and the third bidirectional inverter unit 5 according to the battery model data including the charging voltage data and the charging current data;

[0035] Data downloading and correction process, the main control unit 1 downloads the battery model data and processes and analyzes it to obtain the charging voltage data and charging current data;

[0036] The alarm and adjustment process, when the main control unit 1 detects that the battery 6 reaches the set charge and discharge voltage and current thresholds, adjusts the output states of the first bidirectional inverter unit 2, the second bidirectional inverter unit 3 and the third bidirectional inverter unit 5.

[0037] Furthermore, in the alarm and adjustment process:

[0038] When the charge and discharge voltage of the battery 6 reaches the set alarm threshold, the main control unit 1 issues an alarm prompt;

[0039] When the charge and discharge current of the battery 6 reaches a set current threshold, the main control unit 1 controls the first bidirectional inverter unit 2, the second bidirectional inverter unit 3 and the third bidirectional inverter unit 5 to reduce the charge and discharge current;

[0040] When the charge and discharge current of the battery 6 reaches a set stop threshold, the main control unit 1 controls the first bidirectional inverter unit 2, the second bidirectional inverter unit 3 and the third bidirectional inverter unit 5 to stop working.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wide voltage battery charging inverter control device, characterized in that: The invention comprises a main control unit (1), a first bidirectional inverter unit (2), a second bidirectional inverter unit (3), a high-frequency transformer (4) and a third bidirectional inverter unit (5); the input end of the first bidirectional inverter unit (2) is connected to the AC end; the output end of the first bidirectional inverter unit (2) is connected to the input end of the second bidirectional inverter unit (3); the output end of the second bidirectional inverter unit (3) is connected to the input end of the high-frequency transformer (4); the output end of the high-frequency transformer (4) is connected to the input end of the third bidirectional inverter unit (5); the output end voltage of the third bidirectional inverter unit (5) is used to charge a battery (6); the control end of the first bidirectional inverter unit (2), the control end of the second bidirectional inverter unit (3) and the control end of the third bidirectional inverter unit (5) are respectively connected to the main control unit (1).

2. The wide voltage battery charging inverter control device according to claim 1, characterized in that: The main control unit (1) is connected to a WiFi unit (7), the main control unit (1) receives preset battery model data through the WiFi unit (7), and the main control unit (1) controls the output voltages of the first bidirectional inverter unit (2), the second bidirectional inverter unit (3) and the third bidirectional inverter unit (5) according to the battery model data.

3. The wide voltage battery charging inverter control device according to claim 1, characterized in that: An AC voltage sampling unit (8) is included. The AC voltage sampling unit (8) is connected between the AC terminal and the main control unit (1). The AC voltage sampling unit (8) is used to collect the AC terminal voltage and transmit it to the main control unit (1).

4. The wide voltage battery charging inverter control device according to claim 1, characterized in that: It comprises a current sensor (9), wherein the current sensor (9) is arranged at the input end of the first bidirectional inverter unit (2), and the current sensor (9) is used to collect the current at the input end of the first bidirectional inverter unit (2) and transmit it to the main control unit (1).

5. The wide voltage battery charging inverter control device according to claim 1, characterized in that: It comprises a Hall current sensor (10), the Hall current sensor (10) being arranged at the output end of the third bidirectional inverter unit (5), the Hall current sensor (10) being used to collect the current at the output end of the third bidirectional inverter unit (5) and transmit the current to the main control unit (1).

6. The wide voltage battery charging inverter control device according to claim 1, characterized in that: The invention comprises a DC voltage sampling unit (11), wherein the DC voltage sampling unit (11) is connected between the output end of the third bidirectional inverter unit (5) and the main control unit (1), and the DC voltage sampling unit (11) is used to collect the voltage at the output end of the third bidirectional inverter unit (5) and transmit it to the main control unit (1).

7. The wide voltage battery charging inverter control device according to claim 1, characterized in that: The invention comprises a first isolation drive unit (12), a second isolation drive unit (13) and a third isolation drive unit (14), wherein the first isolation drive unit (12) is connected between the control end of the first bidirectional inverter unit (2) and the main control unit (1), the second isolation drive unit (13) is connected between the control end of the second bidirectional inverter unit (3) and the main control unit (1), and the third isolation drive unit (14) is connected between the control end of the third bidirectional inverter unit (5) and the main control unit (1).

8. The wide voltage battery charging inverter control device according to claim 1, characterized in that: It comprises a speaker unit (15), a display unit (16) and a communication interface (17) connected to the main control unit (1).

9. A wide voltage battery charging inverter control method, characterized in that: The method is implemented based on the device according to claim 1, and the method comprises: A charge and discharge control process, wherein the main control unit (1) controls the output voltages of the first bidirectional inverter unit (2), the second bidirectional inverter unit (3) and the third bidirectional inverter unit (5) according to battery model data including charging voltage data and charging current data; Data downloading and correction process, the main control unit (1) downloads the battery model data and performs processing and analysis to obtain the charging voltage data and charging current data; An alarm and adjustment process, when the main control unit (1) detects that the battery (6) reaches a set charge and discharge voltage and current threshold, adjusts the output states of the first bidirectional inverter unit (2), the second bidirectional inverter unit (3) and the third bidirectional inverter unit (5).

10. The wide voltage battery charging inverter control method according to claim 9, characterized in that: During the alarm and adjustment process: When the charge and discharge voltage of the battery (6) reaches a set alarm threshold, the main control unit (1) issues an alarm prompt; When the charge and discharge current of the battery (6) reaches a set current threshold, the main control unit (1) controls the first bidirectional inverter unit (2), the second bidirectional inverter unit (3) and the third bidirectional inverter unit (5) to reduce the charge and discharge current; When the charge and discharge current of the battery (6) reaches a set stop threshold, the main control unit (1) controls the first bidirectional inverter unit (2), the second bidirectional inverter unit (3) and the third bidirectional inverter unit (5) to stop working.

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