A charger charging control unit and a method for improving charger charging efficiency

Abstract

This invention relates to a charging control unit for a charger and a method for improving the charging efficiency of a charger. It solves the problems of existing technologies where switching circuits cannot meet energy-saving requirements, resulting in high charging energy consumption and an inability to flexibly adjust charging power according to the needs of the load device. It includes a control unit, a control power supply connected to the charger via a communication control line, and the charger connected to the terminal load device via signal lines and charging lines. The control unit is connected to a power factor improvement module and a power efficiency improvement module. Both the power factor improvement module and the power efficiency improvement module are connected to a temperature sensor, a voltage sensor, and a current sensor. The temperature sensor, voltage sensor, and current sensor are connected to the control unit and transmit data. The advantages of this invention are: low switching losses and good power density control and adjustability, effectively controlling charging losses in the circuit and improving charging efficiency.

Description

Technical Field

[0001] This invention relates to the field of charger technology, specifically to a charger charging control unit and a method for improving charger charging efficiency. Background Technology

[0002] Currently, existing charger topologies generally consist of two parts: an AC / DC rectifier circuit and a DC / DC converter. To improve power quality on the grid side, a three-phase voltage source rectifier is typically used to achieve bidirectional active pulse width modulation rectification, while a bidirectional DC / DC topology is used on the DC side to implement the Buck function. This means that each charging circuit requires two stages of conversion: AC / DC and DC / DC. Consequently, the semiconductor power switches used have high switching frequencies, resulting in significant system losses. Furthermore, traditional power switching circuits struggle to meet energy-saving requirements, leading to high charging energy consumption and an inability to flexibly adjust charging power according to the load equipment's needs, resulting in poor performance.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a battery charger [CN201710714228.0], which includes a control module and n charging modules, where n is a positive integer. Each charging module includes a control switch and an uncontrolled rectifier circuit. The control module is electrically connected to several control switches, and the output terminal of each control switch is electrically connected to the input terminal of the uncontrolled rectifier circuit. The input terminal of each control switch is connected to AC power, and the output terminal of each uncontrolled rectifier circuit is connected to a battery. The control module sends control commands to the control switches, and the control switches receive the control commands and close or open the electrical connection with the uncontrolled rectifier circuit according to the control commands.

[0004] The above solution has solved the problems of high switching frequency and large system loss of power switches in the existing technology to a certain extent. However, the solution still has many shortcomings, such as: difficulty in meeting energy-saving requirements, high charging energy consumption, inability to flexibly adjust the charging power according to the needs of the load equipment, and poor performance. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a charger charging control unit.

[0006] The purpose of this invention is to address the above-mentioned problems by providing a method for improving the charging efficiency of a charger.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a charger charging control unit, comprising a control unit, the control unit being connected to the charger via a communication control line, the charger being connected to a terminal load device via a signal line and a charging line, the control unit being respectively connected to a power factor improvement module and a power efficiency improvement module, both the power factor improvement module and the power efficiency improvement module being connected to a temperature sensor, a voltage sensor and a current sensor, the temperature sensor, the voltage sensor and the current sensor being respectively connected to the control unit and transmitting data.

[0008] The above-mentioned charger charging control unit provides a method for improving charger charging efficiency, which includes the following steps:

[0009] S1, Energy Transfer Control;

[0010] S2. Establish a data model and create a charging control strategy;

[0011] S3, Charger information detection and mode control;

[0012] S4. Charger fault detection.

[0013] In the above-mentioned method for improving the charging efficiency of a charger, step S1 specifically includes the following steps:

[0014] S11. The charger detects the current and power required by the terminal load device and sends them to the control unit.

[0015] S12. The control unit sends control commands to the power factor enhancement module and the power efficiency enhancement module based on the information detected by the charger.

[0016] S13, The power factor enhancement module and the power efficiency enhancement module adjust the current and power in the circuit according to the control command to the current and power required by the terminal load device;

[0017] In the above-mentioned method for improving the charging efficiency of a charger, step S2 specifically includes the following steps:

[0018] S21. Record the current and power data of the terminal load device at various time periods, as well as the actual power supply current and power data in the adjusted line.

[0019] S22. Compare the data from different time periods and obtain data error records;

[0020] S23. Establish a data model for optimizing charging efficiency;

[0021] S24. Train a charging efficiency optimization data model based on the adjustment data recorded for each time period.

[0022] S25. Based on the charging efficiency optimization data model, create charging control strategies for different charging time periods and charging states.

[0023] In step S23, the charging efficiency optimization data model includes dynamic power adjustment and dynamic current adjustment, wherein the dynamic power adjustment formula is:

[0024] ;

[0025] Among them, PF corr The power is dynamically adjusted, with a target value ≥ 0.98.

[0026] P active Active power

[0027] Q reactive Reactive power;

[0028] The formula for dynamic current adjustment is:

[0029] ,

[0030] Among them, I c For the compensated current,

[0031] V rms The adjusted voltage value;

[0032] In step S24, the objective function for training the charging efficiency optimization data model is:

[0033]

[0034] Among them, V bat Battery terminal voltage I charge For the charging current, V grid and I grid For grid-side parameters, P out For output power, P in This refers to the input power.

[0035] In step S25, the charging control strategy is based on the optimization data of the charging efficiency optimization data model and differentiated into constant current mode, constant voltage mode, and dynamic power adjustment mode according to the fluctuation of the input voltage.

[0036] The voltage range for constant current mode is:

[0037] ;

[0038] The voltage range for constant voltage mode is:

[0039] ;

[0040] The voltage range in dynamic power adjustment mode is:

[0041] ;

[0042] Based on the above charging control strategy, the charging characteristic curves or BMS commands for different time periods under each mode are preset and stored in the control unit.

[0043] In the above-mentioned method for improving the charging efficiency of a charger, step S3 specifically includes the following steps:

[0044] S31. When the charger is in standby mode, if a terminal load is detected to be connected to the charger, the charger detects the terminal device information and obtains the status information of the terminal load device 3.

[0045] S32. If the fault information, voltage information and temperature information of the terminal load device all meet the corresponding charging conditions, control the charger to switch to charging mode and charge the terminal load device according to the preset charging characteristic curve or BMS command.

[0046] S33. When the charger detects that the terminal device is fully charged, it sends a charging completion signal to the control unit, and the control unit controls the charger to enter the charging completion mode.

[0047] In step S31, the status information includes fault information, terminal load device voltage information, and temperature information. In the charging complete mode, the charging line between the charger and the terminal device is disconnected, the signal line is connected, and the status of the terminal device is detected.

[0048] Step S4 includes the following steps:

[0049] S41. The control unit controls the charger to perform fault self-check;

[0050] S42. If a charger malfunction is detected, control charger 2 to switch to fault mode and stop outputting current and voltage.

[0051] S43. Send a fault message through the communication control line;

[0052] S44. If the charger malfunction is detected and cleared, control the charger to switch to standby mode.

[0053] In step S4, if the charger is found to be fault-free, the voltage information of the terminal load is obtained through the charger detection; if the voltage information of the terminal load is within the preset normal discharge range, the charger is controlled to switch to the charging mode according to the preset charging characteristic curve or BMS command.

[0054] When charging the terminal load, if a fault is detected in the terminal load or the voltage information of the terminal load exceeds the preset terminal load voltage threshold, the charger will switch to the overvoltage alarm fault mode.

[0055] Compared with the prior art, the advantages of the present invention are: low switching loss and good power density control and adjustment, which can effectively control the charging loss in the circuit and improve charging efficiency; secondly, it can automatically adjust the charging mode and the voltage and current state in each mode according to the charging load demand of the terminal load device, thereby reducing power consumption; and it can perform automatic fault detection to improve the safety of use. Attached Figure Description

[0056] Figure 1 This is a partial structural connection diagram of the present invention;

[0057] Figure 2 This is a schematic diagram of the present invention;

[0058] Figure 3 This is a control block diagram of the present invention;

[0059] In the diagram: Control unit 1, Communication control line 11, Charger 2, Signal line 21, Charging line 22, Terminal load device 3, Power factor improvement module 4, Power efficiency improvement module 5, Temperature sensor 6, Voltage sensor 7, Current sensor 8. Detailed Implementation

[0060] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0061] like Figure 1-3 The present invention relates to a charger charging control unit, comprising a control unit 1, which is connected to a charger 2 via a communication control line 11. The charger 2 is connected to a terminal load device 3 via a signal line 21 and a charging line 22. The control unit 1 is connected to a power factor enhancement module 4 and a power efficiency enhancement module 5. Both the power factor enhancement module 4 and the power efficiency enhancement module 5 are connected to a temperature sensor 6, a voltage sensor 7, and a current sensor 8. The temperature sensor 6, the voltage sensor 7, and the current sensor 8 are respectively connected to the control unit 1 and transmit data.

[0062] The power factor improvement module 4 and the power efficiency improvement module 5 are arranged sequentially along the current direction, and the control unit 1 sends control commands to the power factor improvement module 4 and the power efficiency improvement module 5 in sequence.

[0063] The control unit 1 has the advantages of soft switching, low switching loss and high power density, which significantly improves the charging efficiency of the charging circuit.

[0064] Temperature sensor 6, voltage sensor 7, and current sensor 8 are used to detect the status information of power factor improvement module 4 and power efficiency improvement module 5 and send it to control unit 1. Before sending instructions to power factor improvement module 4 and power efficiency improvement module 5, control unit 1 performs a status judgment on power factor improvement module 4 and power efficiency improvement module 5 to avoid instruction execution errors or malfunctions.

[0065] Terminal load device 3 is connected to temperature acquisition module and power acquisition module to collect temperature and power information respectively, which is used to determine the working status of terminal load device 3.

[0066] A method for improving the charging efficiency of a charger includes the following steps:

[0067] S1, Energy Transfer Control;

[0068] S2. Establish a data model and create a charging control strategy;

[0069] S3, Charger 2 Information Detection and Mode Control;

[0070] S4, Charger 2 fault detection.

[0071] Step S1 specifically includes the following steps:

[0072] S11. The charger 2 detects the current and power required by the terminal load device 3 and sends them to the control unit 1;

[0073] S12. The control unit 1 sends control commands to the power factor improvement module 4 and the power efficiency improvement module 5 based on the information detected by the charger 2.

[0074] S13, the power factor enhancement module 4 and the power efficiency enhancement module 5 adjust the current and power in the circuit according to the control command to the current and power required by the terminal load device 3.

[0075] Step S1 mainly uses the power factor improvement module 4 and power efficiency improvement module 5 to adaptively adjust the current and power in the current charging line according to the charging needs of the terminal load device 3, so as to meet the charging needs while adaptively reducing energy consumption and avoiding the loss of high power supply when the load is small and the low charging efficiency caused by low power supply when the load is large.

[0076] Step S2 specifically includes the following steps:

[0077] S21. Record the current and power data of the terminal load device 3 in each time period, as well as the actual power supply current and power data in the adjusted line.

[0078] S22. Compare the data from different time periods and obtain data error records;

[0079] S23. Establish a data model for optimizing charging efficiency;

[0080] S24. Train a charging efficiency optimization data model based on the adjustment data recorded for each time period.

[0081] S25. Based on the charging efficiency optimization data model, create charging control strategies for different charging time periods and charging states.

[0082] Step S2 mainly involves establishing a charging efficiency optimization data model based on charging information and charging adjustment data, and then training and optimizing it to obtain the best charging control strategy for different time periods and charging states, thereby balancing charging energy consumption and charging efficiency.

[0083] In step S23, the charging efficiency optimization data model includes dynamic power adjustment and dynamic current adjustment, wherein the dynamic power adjustment formula is:

[0084] ;

[0085] Among them, PF corr The power is dynamically adjusted, with a target value ≥ 0.98.

[0086] P active Active power

[0087] Q reactive Reactive power;

[0088] The formula for dynamic current adjustment is:

[0089] ,

[0090] Among them, I c For the compensated current,

[0091] V rms The adjusted voltage value;

[0092] In step S24, the objective function for training the charging efficiency optimization data model is:

[0093]

[0094] Among them, V bat I is the battery terminal voltage. charge For charging current, V grid and I grid For grid-side parameters, P out For output power, P in This refers to the input power.

[0095] In step S25, the charging control strategy is based on the optimization data of the charging efficiency optimization data model and differentiated into constant current mode, constant voltage mode, and dynamic power adjustment mode according to the fluctuation of the input voltage.

[0096] The voltage range for constant current mode is:

[0097] ;

[0098] The voltage range for constant voltage mode is:

[0099] ;

[0100] The voltage range in dynamic power adjustment mode is:

[0101] ;

[0102] Based on the above charging control strategy, the charging characteristic curves or BMS commands for different time periods under each mode are preset and stored in the control unit 1.

[0103] Step S3 specifically includes the following steps:

[0104] S31. When the charger 2 is in standby mode, if a terminal load is detected to be connected to the charger 2, the charger 2 detects the terminal device information and obtains the status information of the terminal load device 3.

[0105] S32. If the fault information, voltage information and temperature information of the terminal load device 3 all meet the corresponding charging conditions, control the charger 2 to switch to charging mode and charge the terminal load device 3 according to the preset charging characteristic curve or BMS command.

[0106] S33. When the charger 2 detects that the terminal device is fully charged, it sends a charging completion signal to the control unit 1, and the control unit 1 controls the charger 2 to enter the charging completion mode.

[0107] In step S31, the status information includes fault information, voltage information and temperature information of terminal load device 3. In the charging complete mode, the charging line 22 between the charger 2 and the terminal device is disconnected and the signal line 21 is connected to detect the status of the terminal device.

[0108] Step S3 mainly monitors the status of charger 2 to determine the charging status of charger 2 and enter different charging modes.

[0109] Step S4 includes the following steps:

[0110] S41, Control unit 1 controls charger 2 to perform fault self-check;

[0111] S42. If a fault is detected in charger 2, control charger 2 to switch to fault mode and control charger 2 to stop outputting current and voltage.

[0112] S43. Send a fault message through communication control line 11;

[0113] S44. If the fault of charger 2 is detected to be eliminated, control charger 2 to switch to standby mode.

[0114] In step S4, if the charger 2 is found to be fault-free, the voltage information of the terminal load is obtained by the charger 2; if the voltage information of the terminal load is within the preset normal discharge range, the charger 2 is controlled to switch to the charging mode according to the preset charging characteristic curve or BMS command.

[0115] When charging the terminal load, if a fault is detected in the terminal load or the voltage information of the terminal load exceeds the preset terminal load voltage threshold, the charger 2 is controlled to switch to the overvoltage alarm fault mode.

[0116] Step S4 is mainly used to monitor the status and faults of charger 2 and control the status of charger 2.

[0117] In summary, the principle of this embodiment is as follows: By setting a power factor enhancement module 4 and a power efficiency enhancement module 5 on the charging line to control energy transmission, energy is continuously charged and discharged between the capacitor and the inductor, greatly reducing energy loss during transmission. Different charging control strategies are switched according to the load requirements of the terminal load device 3, thereby reducing losses and improving charging efficiency. Secondly, through the control method, the AC voltage and current are switched when the MOSFET or IGBT is at zero voltage, realizing soft switching function and reducing the power loss of components. Furthermore, by using temperature sensor 6, voltage sensor 7, and current sensor 8 to detect the status information of the power factor enhancement module 4 and the power efficiency enhancement module 5 in real time, the adjustment frequency of the power factor enhancement module 4 and the power efficiency enhancement module 5 is adjusted in a timely manner, and continuous monitoring is performed to avoid damage and instruction execution errors.

[0118] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0119] Although this document frequently uses terms such as control unit 1, communication control line 11, charger 2, signal line 21, charging line 22, terminal load device 3, power factor improvement module 4, power efficiency improvement module 5, temperature sensor 6, voltage sensor 7, and current sensor 8, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A method for improving the charging efficiency of a charger, applicable to a charger charging control unit, wherein the charger charging control unit includes a control unit (1), the control unit (1) is connected to a charger (2) via a communication control line (11), and the charger (2) is connected to a terminal load device (3) via a signal line (21) and a charging line (22), characterized in that, The control unit (1) is connected to a power factor improvement module (4) and a power efficiency improvement module (5). The power factor improvement module (4) and the power efficiency improvement module (5) are each connected to a temperature sensor (6), a voltage sensor (7) and a current sensor (8). The temperature sensor (6), the voltage sensor (7) and the current sensor (8) are connected to the control unit (1) and transmit data. The method includes the following steps: S1, Energy Transfer Control; S2. Establish a data model and create a charging control strategy; S3, Charger (2) Information Detection and Mode Control; S4, Charger (2) Fault Detection; Step S1 specifically includes the following steps: S11. The charger (2) detects the required current and power of the terminal load device (3) and sends it to the control unit (1). S12. The control unit (1) sends control commands to the power factor enhancement module (4) and the power efficiency enhancement module (5) based on the information detected by the charger (2). S13, the power factor enhancement module (4) and the power efficiency enhancement module (5) adjust the current and power in the circuit according to the control command to the current and power required by the terminal load device (3); Step S2 specifically includes the following steps: S21. Record the current and power data of the terminal load device (3) in each time period, as well as the actual power supply current and power data in the adjusted line. S22. Compare the data from different time periods and obtain data error records; S23. Establish a data model for optimizing charging efficiency; S24. Train a charging efficiency optimization data model based on the adjustment data recorded for each time period. S25. Create charging control strategies for different charging time periods and charging states based on the charging efficiency optimization data model; In step S23, the charging efficiency optimization data model includes dynamic power adjustment and dynamic current adjustment, wherein the dynamic power adjustment formula is: ； Among them, PF corr The power is dynamically adjusted, with a target value ≥ 0.

98. P active Active power Q reactive Reactive power; The current dynamic adjustment formula is as follows: ， Among them, I c For the compensated current, V rms The adjusted voltage value; In step S24, the objective function of the training charging efficiency optimization data model is: ； Among them, V bat Battery terminal voltage I charge For charging current, V grid and I grid For grid-side parameters, P out For output power, P in Input power; In step S25, the charging control strategy is based on the optimized data of the charging efficiency optimization data model and differentiated into constant current mode, constant voltage mode, and dynamic power adjustment mode according to the fluctuation of the input voltage. The voltage range for constant current mode is: ； The voltage range for constant voltage mode is: ； The voltage range in dynamic power adjustment mode is: ； According to the above charging control strategy, the charging characteristic curves or BMS commands for different time periods under each mode are preset and stored in the control unit (1).

2. The method for improving the charging efficiency of a charger according to claim 1, characterized in that, Step S3 specifically includes the following steps: S31. When the charger (2) is in standby mode, if it detects that the terminal load is connected to the charger (2), the charger (2) detects the terminal device information and obtains the status information of the terminal load device (3). S32. If the fault information, voltage information and temperature information of the terminal load device (3) all meet the corresponding charging conditions, control the charger (2) to switch to the charging mode and charge the terminal load device (3) according to the preset charging characteristic curve or BMS command. S33. When the charger (2) detects that the terminal device is fully charged, it sends a charging completion signal to the control unit (1), and the control unit (1) controls the charger (2) to enter the charging completion mode.

3. The method for improving the charging efficiency of a charger according to claim 2, characterized in that, In step S31, the status information includes fault information, voltage information and temperature information of the terminal load device (3). In the charging completed mode, the charging line (22) between the charger (2) and the terminal device is disconnected and the signal line (21) is connected to detect the status of the terminal device.

4. The method for improving the charging efficiency of a charger according to claim 3, characterized in that, Step S4 includes the following steps: S41, Control unit (1) controls charger (2) to perform fault self-check; S42. If a fault is detected in the charger (2), control the charger (2) to switch to fault mode and control the charger (2) to stop outputting current and voltage. S43. Send a fault message through the communication control line (11); S44. If the fault of the charger (2) is detected to be eliminated, control the charger (2) to switch to standby mode.

5. The method for improving the charging efficiency of a charger according to claim 4, characterized in that, In step S4, if the charger (2) is found to be fault-free, the voltage information of the terminal load is obtained by the charger (2). If the voltage information of the terminal load is within the preset normal discharge range, the charger (2) is controlled to switch to the charging mode according to the preset charging characteristic curve or BMS command. When charging the terminal load, if the terminal load is detected to be faulty or the voltage information of the terminal load exceeds the preset terminal load voltage threshold, the charger (2) is controlled to switch to the output overvoltage alarm fault mode.

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