Charger charging control unit and method for improving charging efficiency of charger

Abstract

The invention relates to a charger charging control unit and a method for improving the charging efficiency of a charger. The problems that in the prior art, a switching circuit is difficult to meet the energy-saving requirement, the charging energy consumption is large, and the charging power cannot be flexibly adjusted according to the requirements of load equipment are solved. The system comprises a control unit, a control power supply is connected with a charger through a communication control line, the charger is connected with a terminal load device through a signal line and a charging line, and the control unit is connected with a power factor improving module and a power efficiency improving module. The power factor improving module and the power efficiency improving module are both connected with a temperature sensor, a voltage sensor and a current sensor, and the temperature sensor, the voltage sensor and the current sensor are respectively connected with the control unit and carry out data transmission. The charging circuit has the advantages that the switching loss is small, the power density control and adjustability are good, the charging loss in the circuit can be effectively controlled, and the charging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chargers, and particularly to a charging control unit of a charger and a method for improving the charging efficiency of a charger. Background Art

[0002] Currently, the existing charger topologies generally consist of two parts: an AC / DC rectifier circuit and a DC / DC converter. In order to improve the power quality on the grid side, a three-phase voltage source rectifier is generally used to achieve the bidirectional active pulse width modulation rectification function, and a bidirectional DC / DC topology is used on the DC side to achieve the Buck function. That is to say, each charging circuit requires two-stage conversion of AC / DC and DC / DC. Therefore, the semiconductor power switches used have a high switching frequency and large system losses. In addition, the traditional power switch circuit is difficult to meet the energy-saving requirements, consumes a large amount of charging energy, and cannot flexibly adjust the charging power according to the needs of the load device, resulting in poor use effects.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term explorations and proposed various solutions. For example, a Chinese patent document 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 respectively. The output end of the control switch is electrically connected to the input end of the uncontrolled rectifier circuit. The input end of each control switch is connected to an alternating current, and the output end of each uncontrolled rectifier circuit is connected to a battery. The control module sends a control instruction to the control switch, and the control switch receives the control instruction and closes or disconnects the electrical connection with the uncontrolled rectifier circuit according to the control instruction.

[0004] The above solution solves to a certain extent the problems of high switching frequency of the power switch and large system losses in the existing technology. However, this solution still has many deficiencies. For example, it is difficult to meet the energy-saving requirements, consumes a large amount of charging energy, cannot flexibly adjust the charging power according to the needs of the load device, and has poor use effects. Summary of the Invention

[0005] An object of the present invention is to provide a charging control unit of a charger for the above problems.

[0006] An object of the present invention is to provide a method for improving the charging efficiency of a charger for the above problems.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A charging control unit for a charger, comprising a control unit, a control power supply is connected to the charger through a communication control line, the charger is connected to a terminal load device through a signal line and a charging line, and the control unit is respectively connected with a power factor improvement module and a power efficiency improvement module. The power factor improvement module and the power efficiency improvement module are both connected with a temperature sensor, a voltage sensor and a current sensor, and the temperature sensor, the voltage sensor and the current sensor are respectively connected to the control unit for data transmission.

[0008] According to the above-mentioned charging control unit 1 of the charger, a method for improving the charging efficiency of the charger is provided. The method 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 method for improving the charging efficiency of the charger, step S1 specifically includes the following steps:

[0014] S11. Detect the current and power required by the terminal load device through the charger and send them to the control unit;

[0015] S12. The control unit issues control instructions to the power factor improvement module and the power efficiency improvement module according to the information detected by the charger;

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

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

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

[0019] S22. Compare the data in each time period and obtain a data error record;

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

[0021] S24. Train the charging efficiency optimization data model according to the adjustment data recorded in each time period;

[0022] S25. Create a charging control strategy for different charging time periods and charging states according to the optimized data model of charging efficiency.

[0023] In step S23, the optimized data model of charging efficiency includes power dynamic regulation and current dynamic regulation. Among them, the power dynamic regulation formula is:

[0024]

[0025] Among them, PD corr is the power after dynamic adjustment, and its target value ≥ 0.98.

[0026] P active is the active power.

[0027] Q reactive is the reactive power.

[0028] The current dynamic regulation formula is:

[0029]

[0030] Among them, I c is the compensated current.

[0031] V rms is the regulated power value.

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

[0033]

[0034] Among them, V bat is the battery terminal voltage, I charge is the charging current, V grid and I grid are grid-side parameters, P out is the output current, and P out is the input current.

[0035] In step S25, the charging control strategy is divided into a constant current mode, a constant voltage mode, and a power dynamic regulation mode based on the optimized data of the optimized data model of charging efficiency and according to the fluctuation of the input voltage. Among them,

[0036] The voltage range of the constant current mode is:

[0037] V grid ∈ [V min , V nom ;

[0038] The voltage range of the constant voltage mode is:

[0039] V grid > Vnom ;

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

[0041] V grid < V min or T > T safe ;

[0042] Preset the charging characteristic curves or BMS commands for different time periods in each mode according to the above charging control strategy, and pre-store them in the control unit.

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

[0044] S31. When the charger is in the standby mode, if it detects that the terminal load is 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, terminal load device voltage information, and temperature information of the terminal load device all meet the corresponding charging conditions, control the charger to jump to the 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, send 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 completion mode, the charging line between the charger and the terminal device is disconnected, and 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 a fault self-check;

[0050] S42. If it detects that the charger has a fault, control the charger 2 to jump to the fault mode, and control the charger to stop outputting current and voltage.

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

[0052] S44. If it detects that the charger fault is eliminated, control the charger to jump to the standby mode.

[0053] In step S4, if no fault is detected in the charger, obtain the voltage information of the terminal load through charger detection; if the voltage information of the terminal load is within the preset normal discharge range, control the charger to jump to the charging mode according to the preset charging characteristic curve or BMS instruction.

[0054] When charging the terminal load, if it is detected that the terminal load fails or the voltage information of the terminal load exceeds the preset terminal load voltage threshold, control the charger to jump to the overvoltage alarm fault mode.

[0055] Compared with the prior art, the advantages of the present invention are as follows: small switching loss, good power density control and regulation, capable of effectively controlling the charging loss in the circuit and improving the charging efficiency; secondly, capable of automatically adjusting the charging mode and the voltage and current states in each mode according to the charging load requirements of the terminal load device, thereby reducing power consumption; and capable of performing automatic fault detection to improve the use safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a block diagram of the local structure connection in the present invention;

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

[0058] Figure 3 is the control block diagram in the present invention;

[0059] In the figure: 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 DESCRIPTION OF THE EMBODIMENTS

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

[0061] As Figures 1-3 shown, a charging control unit of a charger includes a control unit 1. The control power supply is connected to the charger 2 through the communication control line 11. The charger 2 is connected to the terminal load device 3 through the signal line 21 and the charging line 22. The control unit 1 is respectively connected with 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 both connected with 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 for data transmission.

[0062] The power factor improvement module 4 and the power efficiency improvement module 5 are arranged in sequence along the current direction, and the control unit 1 issues control instructions to the power factor improvement module 4 and the power efficiency improvement module 5 in sequence;

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

[0064] The temperature sensor 6, the voltage sensor 7, and the current sensor 8 are used to detect the status information of the power factor improvement module 4 and the power efficiency improvement module 5 and send it to the control unit 1. Before sending instructions to the power factor improvement module 4 and the power efficiency improvement module 5, the control unit 1 pre-judges the status of the power factor improvement module 4 and the power efficiency improvement module 5 to avoid incorrect instruction execution or faults.

[0065] The terminal load device 3 is connected to the temperature acquisition module and the power acquisition module, respectively collecting temperature and power information for judging the working state of the 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, Detect the current and power required by the terminal load device 3 through the charger 2 and send it to the control unit 1;

[0073] S12, The control unit 1 issues control instructions to the power factor improvement module 4 and the power efficiency improvement module 5 according to the information detected by the charger 2;

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

[0075] Step S1 mainly adapts to the charging demand of the terminal load device 3, uses the power factor improvement module 4 and the power efficiency improvement module 5 to adaptively adjust the current and power in the current charging line for charging adaptation, while meeting the charging demand, adaptively reducing energy consumption, avoiding the loss of high-power power supply when the load is small and the low charging efficiency caused by low-power 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 circuit;

[0078] S22. Compare the data in each time period and obtain the data error record;

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

[0080] S24. Train the charging efficiency optimization data model according to the adjustment data recorded in each time period;

[0081] S25. Create a charging control strategy for different charging time periods and charging states according to the charging efficiency optimization data model.

[0082] Step S2 mainly establishes a charging efficiency optimization data model based on charging information and charging adjustment data, trains and optimizes it, and obtains the best charging control strategy for each time period and different charging states, so as to balance charging energy consumption and charging efficiency.

[0083] In step S23, the charging efficiency optimization data model includes power dynamic regulation and current dynamic regulation. Among them, the power dynamic regulation formula is:

[0084]

[0085] Among them, PD corr is the dynamically adjusted power, and its target value ≥ 0.98,

[0086] P active is the active power,

[0087] Q reactive is the reactive power;

[0088] The current dynamic regulation formula is:

[0089]

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

[0091] V rms is the regulated power value;

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

[0093]

[0094] Among them, V batIs the battery terminal voltage I charge Is the charging current, V grid And I grid Are the grid-side parameters, P out Is the output current, P out Is the input current.

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

[0096] The voltage range of the constant current mode is:

[0097] V grid ∈[V min , V nom ;

[0098] The voltage range of the constant voltage mode is:

[0099] V grid >V nom ;

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

[0101] V grid <V min Or T>T sefe ;

[0102] According to the above charging control strategy, preset the charging characteristic curves or BMS commands for different time periods in each mode, and pre-store them in the control unit 1.

[0103] Step S3 specifically includes the following steps:

[0104] S31. When the charger 2 is in the 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;

[0105] S32. If the fault information, the voltage information, and the temperature information of the terminal load device 3 all meet the corresponding charging conditions, control the charger 2 to jump to the 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 of the terminal load device 3, and temperature information. In the charging completion 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 the charger 2 to determine the charging status of the charger 1 and enter different charging modes.

[0109] Step S4 includes the following steps:

[0110] S41. The control unit 1 controls the charger 2 to perform a fault self-check;

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

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

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

[0114] In step S4, if no fault is detected in the charger 2, the voltage information of the terminal load is obtained through the detection of the charger 2; if the voltage information of the terminal load is within the preset normal discharge range, the charger 2 is controlled to jump to the charging mode according to the preset charging characteristic curve or BMS instruction;

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

[0116] Step S4 is mainly used to monitor the status and faults of the charger 1 and control the status of the charger 1.

[0117] In summary, the principle of this embodiment is as follows: By respectively setting a power factor boosting module 4 and a power efficiency boosting module 5 on the charging line to control energy transmission, the energy is continuously charged and discharged between the capacitor and the inductor, greatly reducing the energy loss during transmission. Different charging control strategies are switched according to the load demand of the terminal load device 3, achieving the purpose of reducing losses and improving the charging efficiency. Secondly, through the control method, the AC voltage and current are switched when the MOS transistor or IGBT is at zero voltage, realizing the soft-switching function and reducing the power loss of the components. Moreover, through the real-time detection of the state information of the power factor boosting module 4 and the power efficiency boosting module 5 by the temperature sensor 6, the voltage sensor 7, and the current sensor 8, the adjustment frequency of the power factor boosting module 4 and the power efficiency boosting module 5 is timely adjusted, and continuous monitoring is carried out to avoid damage and incorrect instruction execution.

[0118] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0119] Although terms such as control unit 1, communication control line 11, charger 2, signal line 21, charging line 22, terminal load device 3, power factor boosting module 4, power efficiency boosting module 5, temperature sensor 6, voltage sensor 7, and current sensor 8 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A charging control unit for a charger, comprising a control unit (1), wherein the control power supply is connected to the charger (2) through a communication control line (11), and the charger (2) is connected to a terminal load device (3) through a signal line (21) and a charging line (22), characterized in that, The described control unit (1) is respectively 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 both 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 perform data transmission.

2. A method for improving the charging efficiency of a charger charging control unit according to claim 1, characterized in that, This method includes the following steps: S1. Energy transfer control; S2. Establish a data model and create a charging control strategy; S3. Information detection and mode control of the charger (2); S4. Fault detection of the charger (2).

3. A method for improving the charging efficiency of a charger (2) according to claim 1, characterized in that Step S1 specifically includes the following steps: S11. Detect the current and power required by the terminal load device (3) through the charger (2) and send them to the control unit (1); S12. The control unit (1) issues control instructions to the power factor improvement module (4) and the power efficiency improvement module (5) according to the information detected by the charger (2); S13. The power factor improvement module (4) and the power efficiency improvement module (5) adjust the current and power in the circuit to the current and power required by the terminal load device (3) according to the control instructions.

4. A method for improving the charging efficiency of a charger (2) according to claim 2, characterized in that, 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 in each time period and obtain the data error record; S23. Establish a charging efficiency optimization data model; S24. Train the charging efficiency optimization data model according to the adjustment data recorded in each time period; S25. Create a charging control strategy for different charging time periods and charging states according to the charging efficiency optimization data model.

5. A method for improving the charging efficiency of a charger (2) according to claim 4, characterized in that, In step S23, the charging efficiency optimization data model includes power dynamic regulation and current dynamic regulation. Among them, the power dynamic regulation formula is: Among them, PD corr is the power after dynamic adjustment, and its target value ≥ 0.98 P active is the active power Q reactive is reactive power; The current dynamic regulation formula is: Among them, I c is the compensated current, V rms is the adjusted power value; In step S24, the objective function for training the charging efficiency optimization data model is: Among them, V bat is the battery terminal voltage I charge is the charging current, V grid and I grid are grid-side parameters, P out is the output current, P out is the input current.

6. A method for improving the charging efficiency of a charger (2) according to claim 4, characterized in that, In step S25, the charging control strategy is based on the optimized data of the charging efficiency optimization data model and is divided into a constant current mode, a constant voltage mode, and a power dynamic regulation mode according to the fluctuation of the input voltage. Among them, The voltage range of the constant current mode is: V grid ∈ [V min , V nom ; The voltage range of the constant voltage mode is: V grid > V nom ; The voltage range during the power dynamic regulation mode is: V grid <V min or T > T safe ; Preset the charging characteristic curves or BMS instructions for different time periods in each mode according to the above charging control strategy, and pre-store them in the control unit (1).

7. A method for improving the charging efficiency of a charger (2) according to claim 2, characterized in that, Step S3 specifically includes the following steps: S31. When the charger (2) is in the 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 jump to the charging mode, and charge the terminal load device (3) according to the preset charging characteristic curve or BMS instruction. S33. When the charger (2) detects that the terminal device is fully charged, send a charging completion signal to the control unit (1), and the control unit (1) controls the charger (2) to enter the charging completion mode.

8. A method for improving the charging efficiency of a charger (2) according to claim 7, characterized in that, In step S31, the state information includes fault information, voltage information, and temperature information of the terminal load device (3). In the charging completion 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 state of the terminal device.

9. A method for improving the charging efficiency of a charger (2) according to claim 7, characterized in that, Step S4 includes the following steps: S41. The control unit (1) controls the charger (2) to perform a fault self-check. S42. If it is detected that the charger (2) has a fault, control the charger (2) to jump to the 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 it is detected that the fault of the charger (2) is eliminated, control the charger (2) to jump to the standby mode.

10. A method for improving the charging efficiency of a charger (2) according to claim 9, characterized in that, In step S4, if it is detected that the charger (2) has no fault, obtain the voltage information of the terminal load through the detection of the charger (2). If the voltage information of the terminal load is within the preset normal discharge range, control the charger (2) to jump to the charging mode according to the preset charging characteristic curve or BMS instruction. When charging the terminal load, if it is detected that the terminal load has a fault or the voltage information of the terminal load exceeds the preset terminal load voltage threshold, control the charger (2) to jump to the overvoltage alarm fault mode.

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