Control method, device and control equipment for dual-transmitting-module wireless charging system

Abstract

The invention provides a control method, device and control equipment for a double-transmitting-module wireless charging system, and relates to the technical field of wireless charging. The method comprises the following steps: controlling a lower bridge arm switch tube of a full-bridge inverter of a second transmitting module to be continuously conducted, and obtaining the voltage of a shunt capacitor in an LCC compensation network of a first transmitting module as a first voltage; a lower bridge arm switch tube of a full-bridge inverter of the first transmitting module is controlled to be continuously switched on, and the voltage of a shunt capacitor in an LCC compensation network of the second transmitting module is obtained to serve as second voltage; determining the mutual inductance ratio of the first transmitting module and the second transmitting module according to the first voltage and the second voltage; and the first transmitting module and the second transmitting module are controlled according to the mutual inductance ratio, so that cooperative charging is realized. Mutual inductance identification is carried out on the two transmitting modules, the two transmitting modules are controlled according to the mutual inductance ratio, the output power requirement is met, meanwhile, loss caused by operation of invalid modules is effectively reduced, and the overall energy efficiency of the system is optimized.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and in particular to a control method, apparatus and control equipment for a dual-transmitter module wireless charging system. Background Technology

[0002] Drones equipped with wireless charging systems can autonomously land on wireless charging platforms for wireless energy replenishment after performing tasks such as inspection and delivery, eliminating the need for manual operation and achieving a high degree of automation in both task execution and charging. However, when a drone lands on the charging platform, unavoidable positional deviations occur, resulting in variations in the relative positions of its receiving and transmitting coils each time, affecting charging performance.

[0003] In existing technologies, wireless charging systems typically employ dual- or multi-transmitter coil arrays to improve the system's adaptability to landing position deviations and expand the effective charging area. However, due to the drone's docking position offset, the coils cannot be adjusted according to the coupling state, leading to a decrease in overall system energy efficiency under asymmetrical coupling conditions. Summary of the Invention

[0004] This invention provides a control method, apparatus, and control device for a dual-transmitter module wireless charging system to solve the problem of low overall system efficiency in multi-coil wireless charging systems.

[0005] In a first aspect, embodiments of the present invention provide a control method for a dual-transmitter module wireless charging system, applied to a dual-transmitter module wireless charging system; the dual-transmitter module wireless charging system includes: a first transmitter module and a second transmitter module; the first transmitter module includes: a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; The above control methods include: The lower bridge arm switch of the full-bridge inverter of the second transmitting module is kept on while the upper bridge arm switch is turned off, so as to control the full-bridge inverter of the first transmitting module to work normally and obtain the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage. The lower bridge arm switch of the full-bridge inverter of the first transmitting module is kept on while the upper bridge arm switch is turned off, so as to control the full-bridge inverter of the second transmitting module to work normally and obtain the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage. The mutual inductance ratio of the first transmitting module and the second transmitting module is determined based on the first voltage and the second voltage. The first and second transmitting modules are controlled based on the mutual inductance ratio to achieve coordinated charging.

[0006] Secondly, embodiments of the present invention provide a control device for a dual-transmitter module wireless charging system, applied to a dual-transmitter module wireless charging system; the dual-transmitter module wireless charging system includes: a first transmitter module and a second transmitter module; the first transmitter module includes: a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; The aforementioned control device includes: The first parameter acquisition module is used to control the lower bridge arm switch of the full-bridge inverter of the second transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, so as to control the full-bridge inverter of the first transmitting module to work normally and acquire the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage. The second parameter acquisition module is used to control the lower bridge arm switch of the full-bridge inverter of the first transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, to control the full-bridge inverter of the second transmitting module to work normally, and to acquire the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage. The mutual inductance ratio output module is used to determine the mutual inductance ratio of the first transmitting module and the second transmitting module based on the first voltage and the second voltage. The charging control module is used to control the first and second transmitting modules according to the mutual inductance ratio to achieve coordinated charging.

[0007] Thirdly, embodiments of the present invention provide a control device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the dual-transmitter module wireless charging system control method as described in the first aspect or any possible implementation of the first aspect.

[0008] This invention provides a control method, apparatus, and control device for a dual-transmitter module wireless charging system. The aforementioned control method for a dual-transmitter module wireless charging system is applied to a dual-transmitter module wireless charging system. The dual-transmitter module wireless charging system includes a first transmitter module and a second transmitter module. The first transmitter module includes a full-bridge inverter, an LCC compensation network, and a transmitting coil connected in sequence. The circuit structures of the first and second transmitter modules are identical. The control method includes: controlling the lower bridge arm switch of the full-bridge inverter of the second transmitter module to be continuously on and the upper bridge arm switches to be completely off, controlling the full-bridge inverter of the first transmitter module to operate normally, and obtaining the voltage of the parallel capacitor in the LCC compensation network of the first transmitter module as the first voltage; controlling the lower bridge arm switch of the full-bridge inverter of the first transmitter module to be continuously on and the upper bridge arm switches to be completely off, controlling the full-bridge inverter of the second transmitter module to operate normally, and obtaining the voltage of the parallel capacitor in the LCC compensation network of the second transmitter module as the second voltage; determining the mutual inductance ratio of the first and second transmitter modules based on the first and second voltages; and controlling the first and second transmitter modules based on the mutual inductance ratio to achieve coordinated charging. This invention identifies the mutual inductance of two transmitting modules and determines their control strategies based on the mutual inductance ratio. This allows them to achieve a better working state during collaborative charging, effectively reducing losses caused by inactive modules while meeting output power requirements and optimizing the overall energy efficiency of the system. Attached Figure Description

[0009] Figure 1 This is a flowchart illustrating the implementation of a control method for a dual-transmitter module wireless charging system provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a dual-transmitter module wireless charging system provided in an embodiment of the present invention; Figure 3 yes Figure 2 The diagram shows an equivalent circuit of a dual-transmitter module wireless charging system. Figure 4 yes Figure 2 The diagram shows another equivalent circuit of the dual-transmitter module wireless charging system. Figure 5 This is an efficiency optimization curve provided in an embodiment of the present invention; Figure 6 This is a power percentage diagram provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the control device for the dual-transmitter module wireless charging system provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the control device provided in an embodiment of the present invention. Detailed Implementation

[0010] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0011] See Figure 1 The diagram illustrates a flowchart of the implementation of a control method for a dual-transmitter module wireless charging system provided in an embodiment of the present invention. The aforementioned control method for a dual-transmitter module wireless charging system is applied to a dual-transmitter module wireless charging system; see reference... Figure 2 The dual-transmitter module wireless charging system includes a first transmitter module and a second transmitter module; the first transmitter module includes a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; For details, please refer to Figure 2 The two transmitting modules share a single DC power supply. U dc Power supply, the first transmitting module includes a switching transistor S 1. S 2. S 3 and S A full-bridge inverter consisting of 4 components, with compensation inductors L f1 Parallel compensation capacitors C f1 and series compensation capacitor C p1 The LCC compensation network and the transmitting coil are constructed. L p1 (including parasitic resistance) R p1 The second launch module includes a switching transistor. S 5. S 6. S 7 and S A full-bridge inverter consisting of 8 components, with compensation inductors L f2 Parallel compensation capacitors C f2 and series compensation capacitor C p2 The LCC compensation network and the transmitting coil are constructed. L p2 (including parasitic resistance) R p2 The receiving circuit includes a receiving coil. L s (including parasitic resistance) R s ), series compensation capacitor C s , by diode D 1. D 2. D 3 and D A rectifier bridge consisting of 4 capacitors and a load voltage regulator capacitor.C o and load resistance R L . M 1 represents the transmitting coil of the first transmitting module. L p1 With receiving coil L s Mutual intuition M 2 is the transmitting coil of the second transmitting module. L p2 With receiving coil L s Mutual intuition M 12 For transmitting coil L p1 With transmitting coil L p2 Mutual attraction between them.

[0012] Define the phase shift angle of the first transmitting module as: ( >0), the phase shift angle of the second transmitting module is ( If the voltage is greater than 0, then the fundamental frequency of the full-bridge inverter output voltage of the first transmitting module is... The fundamental frequency of the full-bridge inverter output voltage of the second transmitting module Represented as:

[0013] in, For the system operating frequency, This is the DC power supply voltage.

[0014] The system's compensation network parameters satisfy the following relationship:

[0015] The system's output voltage is expressed as:

[0016] in ， This is the equivalent resistance before the rectifier bridge at the receiving end. For a full-bridge rectifier circuit, this is related to the DC-side load resistance. The relationship is:

[0017] From formula (3), it can be seen that the output voltage of the system is... and A joint decision. For further analysis... and Impact on the system, assuming the fundamental effective value of the full-bridge inverter output voltage of the second transmitting module. The fundamental effective value of the full-bridge inverter output voltage of the first transmitting module. of times, of which >0, and simultaneously the fundamental frequency of the full-bridge inverter output voltage of the second transmitting module. The fundamental frequency relative to the full-bridge inverter output voltage of the first transmitting module The phase difference is At this point, the system's transmission efficiency is as follows:

[0018] As can be seen from formula (5), when there is a phase difference between the fundamental frequencies of the output voltages of the two full-bridge inverters... This will reduce the system's transmission efficiency. To maximize the system's transmission efficiency, the fundamental phase of the output voltage of the full-bridge inverters corresponding to the two transmitting modules should be the same.

[0019] Assuming the fundamental frequencies of the full-bridge inverter output voltages corresponding to the two transmitting modules are in phase, let From formula (5), we can see that finding the maximum value of the system transmission efficiency is equivalent to finding... The minimum value. For Differentiation yields:

[0020] Setting formula (6) to 0, we get:

[0021] when When, the derivative is less than 0; when When the derivative is greater than 0, that is, the denominator of formula (5) first decreases and then increases, and has a minimum value, then the transmission efficiency of the system has a maximum value. .

[0022] Based on the above, we can conclude that the system has the highest transmission efficiency when the voltage of the transmitting module satisfies formula (8).

[0023]

[0024] Based on the above theory, this application provides a control method for a dual-transmitter module wireless charging system, including: S101: Control the lower bridge arm switch of the full-bridge inverter of the second transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, control the full-bridge inverter of the first transmitting module to work normally, and obtain the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage; First, the transmitting coil of the first transmitting module...L p1 With receiving coil L S The mutual inductance is identified. The lower bridge arm switching transistor of the full-bridge inverter controlling the second transmitting module ( S 6. S 8) Continuously conducting, upper bridge arm switch ( S 5. S 7) With all connections disconnected, the full-bridge inverter controlling the first transmitting module operates normally. The system equivalent circuit is as follows: Figure 3 As shown.

[0025] Represented as:

[0026] According to Kirchhoff's voltage law, the loop equation of the system can be obtained:

[0027] The impedances of each loop are shown below:

[0028] Based on the above, the currents on the transmitting coils of the two transmitting modules are as follows:

[0029] From formulas (2) and (9), we can see that... The value of is infinite; as can be seen from formula (11), The value of is also infinite. When When the value is infinite, it can be seen from formula (12) that the current of the transmitting coil corresponding to the second transmitting module is... The value approaches 0. The current flowing through the transmitting coil... Approaching 0 means the transmitting coil L p2 Unable to generate an effective alternating magnetic field, its electromagnetic coupling with other coils in the system is completely suppressed. This state makes subsequent... In the identification process, the cross-coupling effect caused by the second transmitting module can be completely ignored.

[0030] With switching transistor S With the phase of the driving signal 1 as a reference, when the phase shift angle of the first transmitting module is... At that time, the fundamental effective value of the full-bridge inverter output voltage With switching transistor S The phase difference of the driving signal of 1 is From formula (12), it can be seen that the current flowing through the transmitting coil of the first transmitting module is... With switching transistor SThe phase difference of the driving signal of 1 is Define the parallel compensation capacitor for the first transmitting module. The voltage across the two ends is ,definition With switching transistor S The phase difference of the driving signal of 1 is We can obtain:

[0031] in, for phase, for The phase.

[0032] Simplifying formula (13) yields the mutual inductance between the transmitting coil and the receiving coil of the first transmitting module. for:

[0033] From formula (14), it can be seen that the parasitic resistance of the transmitting coil of the first transmitting module is... Equivalent resistance before the rectifier bridge at the receiving end The equivalent resistance before the rectifier bridge at the receiving end can be obtained by measurement after the coil is manufactured. The phase shift angle of the first transmitting module can be calculated by measuring the DC-side output voltage and current, and then transmitted to the transmitting end via wireless communication methods such as WiFi; The setpoint for the control system; DC power supply voltage. and system operating angular frequency It is also a known value.

[0034] Therefore, mutual inductance is identified based on equation (14). Only the parallel compensation capacitor needs to be measured. The voltage across the two ends is From this, obtain its effective value and its relationship with the switching transistor. S 1. Phase difference between drive signals The calculation can then be completed.

[0035] S102: Control the lower bridge arm switch of the full-bridge inverter of the first transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, control the full-bridge inverter of the second transmitting module to work normally, and obtain the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage; Similarly, the mutual inductance between the transmitting coil and the receiving coil of the second transmitting module... Identification is performed, and the lower bridge arm switching transistor of the full-bridge inverter of the first transmitting module is also controlled. S 2 、S 4) Continuous conduction, upper bridge arm switch (S 1 、S 3) With both terminals disconnected, the full-bridge inverter controlling the second transmitting module operates normally. The equivalent circuit of the system is as follows: Figure 4 As shown.

[0036] Represented as: (15) According to Kirchhoff's voltage law, the loop equation of the system can be obtained: (16) The impedances of each loop are shown below: (17) From equation (16), the currents on the transmitting coils corresponding to the two transmitting modules can be obtained as follows: (18) From formula (2) and formula (15), we can see that If the value is infinite, then according to formula (17), we know that The value of is also infinite. When When the value is infinite, it can be seen from formula (18) that the current of the transmitting coil corresponding to the first transmitting module is... The value approaches 0. The current flowing through the transmitting coil... Approaching 0 means the transmitting coil L p1 Unable to generate an effective alternating magnetic field, its electromagnetic coupling with other coils in the system is completely suppressed. This state makes subsequent... In the measurement, the cross-coupling effect brought about by the first transmitting module can be completely ignored.

[0037] With switching transistor S With the phase of the drive signal of 5 as a reference, when the phase shift angle of the second transmitting module is... At that time, the fundamental effective value of the full-bridge inverter output voltage With switching transistor S The phase difference of the drive signal of 5 is From formula (18), it can be seen that the current flowing through the transmitting coil of the second transmitting module is... With switching transistor S The phase difference of the drive signal of 5 is - Define the parallel compensation capacitor for the second transmitting module. The voltage across the two ends is ,definition With switching transistor S The phase difference of the drive signal of 5 is We can obtain: (19) in, for phase, for The phase.

[0038] Simplifying formula (19) yields the mutual inductance between the transmitting coil and the receiving coil of the second transmitting module. for: (20) In formula (20), many parameters can be considered as known quantities: the parasitic resistance of the transmitting coil of the second transmitting module. Equivalent resistance before the rectifier bridge at the receiving end The equivalent resistance before the rectifier bridge at the receiving end can be obtained by measurement after the coil is manufactured. The phase shift angle of the second transmitting module can be calculated by measuring the DC-side output voltage and current. The setpoint for the control system; DC power supply voltage. and system operating angular frequency This is also a known value. Therefore, mutual inductance can be identified based on equation (20). Only by measuring the parallel compensation capacitor is it possible to achieve this. The voltage across the two ends is From this, obtain its effective value and its relationship with the switching transistor. S 5. Phase difference between drive signals The calculation can then be completed.

[0039] Based on the above, this application obtains a first voltage and a second voltage, and uses the two voltages to identify the mutual inductance of the two transmitting modules.

[0040] S103: Determine the mutual inductance ratio of the first transmitting module and the second transmitting module based on the first voltage and the second voltage; Based on the above analysis, in one possible implementation, S103 may include: S1031: Calculate the phase difference between the first voltage and the switching transistor drive signal of the upper left bridge arm of the full-bridge inverter of the first transmitting module, and use it as the first phase difference; S1032: Calculate the phase difference between the second voltage and the drive signal of the switching transistor of the upper left bridge arm of the full-bridge inverter of the second transmitting module, and use it as the second phase difference; S1033: Determine the mutual inductance ratio based on the first phase difference, the second phase difference, the effective value of the first voltage, and the effective value of the second voltage.

[0041] In one possible implementation, S1033 may include: 1. The first mutual inductance is calculated based on the effective value of the first phase difference and the first voltage, combined with the first formula; 2. The second mutual inductance is calculated based on the second phase difference and the effective value of the second voltage, combined with the second formula; 3. Determine the mutual inductance ratio based on the first and second mutual inductances; wherein the mutual inductance ratio is less than 1; The first formula may include:

[0042] in, For the first mutual intuition, For the system operating frequency, The effective value of the first voltage. This is the DC power supply voltage. The phase shift angle of the first launch module. The value of the compensation inductor for the first transmitting module. The first phase difference, This is the parasitic resistance of the transmitting coil of the first transmitting module. The equivalent resistance before the rectifier bridge at the receiving end. This is the parasitic resistance of the receiving coil; The second formula may include:

[0043] in, For the second mutual induction, This is the effective value of the second voltage. The phase shift angle of the second launch module. The value of the compensation inductor for the second transmitting module. For the second phase difference, This is the parasitic resistance of the transmitting coil of the second transmitting module.

[0044] The first and second formulas are based on the analysis above and will not be repeated here.

[0045] After completing mutual inductance identification, in order to formulate a scientific module activation strategy and avoid energy loss caused by the ineffective operation of weakly coupled transmitter modules, a quantitative analysis of the power transmission capability of the dual transmitter modules is required. It is assumed that the system is already operating according to the efficiency optimization strategy, i.e., satisfying... (where 0 < <1). Under these conditions, the power provided by the two transmitting modules to the load can be expressed as: (twenty one) in, The power provided by the first transmitting module to the load. The power provided by the second transmitting module to the load.

[0046] To simplify the analysis and highlight the power contribution ratio, the power contribution ratio of the second transmitting module can be further derived. for: (twenty two) This refers to the proportion of the total output power provided by the second transmitting module. The threshold for enabling the weakly coupled transmit module is equal to... .

[0047] From equation (22), it can be seen that when When the coupling strength of the two modules is relatively small (i.e., the difference in coupling strength between the two modules is significant), the coupling strength of the two modules is relatively small. The value is also very small; with Increase (i.e., the coupling strength tends to be balanced). Gradually increase, when When =1, =0.5, the power contribution of the two modules is equal.

[0048] Therefore, it can be based on (or equivalent) (Value) Define the module activation policy: only when Exceeding the preset threshold When the power contribution of the weakly coupled transmitter module reaches a certain level, both transmitter modules should be turned on simultaneously and powered according to the efficiency optimization strategy; otherwise, only the strongly coupled transmitter module should be turned on and powered separately to avoid the circuit losses of the full-bridge inverter, drive, etc. caused by the additional turn on of the weakly coupled transmitter module, thereby optimizing the overall energy efficiency of the system.

[0049] The above analysis assumes... Since the ratio is less than 1, this application distinguishes between strong and weak mutual inductance, and the default mutual inductance ratio is the ratio of weak mutual inductance to strong mutual inductance.

[0050] In one possible implementation, determining the mutual inductance ratio based on the first mutual inductance and the second mutual inductance may include: If the first mutual inductance divided by the second mutual inductance is not greater than 1, then the first mutual inductance divided by the second mutual inductance is taken as the mutual inductance ratio. If the first mutual inductance divided by the second mutual inductance is greater than 1, then the second mutual inductance divided by the first mutual inductance is used as the mutual inductance ratio.

[0051] This application defines a mutual inductance ratio of less than 1, and uses two mutual inductance ratios less than 1 as the mutual inductance ratio for convenient subsequent calculations.

[0052] S104: Control the first and second transmitting modules according to the mutual inductance ratio to achieve coordinated charging.

[0053] Based on the above analysis, this application distinguishes between strong and weak coupling transmission modules and formulates a control strategy.

[0054] In one possible implementation, S104 may include: S1041: If the first mutual inductance is greater than the second mutual inductance, then the first transmitting module is used as a strongly coupled transmitting module and the second transmitting module is used as a weakly coupled transmitting module. S1042: If the first mutual inductance is not greater than the second mutual inductance, then the second transmitting module is used as a strongly coupled transmitting module and the first transmitting module is used as a weakly coupled transmitting module. S1043: If the mutual inductance ratio is less than the mutual inductance ratio threshold, only the strongly coupled transmission module will be enabled; S1044: If the mutual inductance ratio is not less than the mutual inductance ratio threshold, then both the strongly coupled transmission module and the weakly coupled transmission module are turned on simultaneously.

[0055] This application first identifies the strong and weak coupling transmitter modules. When the mutual inductance ratio reaches the mutual inductance ratio threshold, it indicates that the power contribution of the weak coupling transmitter module has reached a certain level. Only then is the weak coupling transmitter module turned on to reduce power consumption and improve charging efficiency.

[0056] In one possible implementation, S104 may further include: S1045: If both the strongly coupled and weakly coupled transmitter modules are turned on simultaneously, the strongly coupled and weakly coupled transmitter modules are controlled to ensure that the ratio of the fundamental effective value of the full-bridge inverter output voltage of the weakly coupled transmitter module to the fundamental effective value of the full-bridge inverter output voltage of the strongly coupled transmitter module is equal to the mutual inductance ratio, and that the full-bridge inverter output voltage of the weakly coupled transmitter module is in phase with the full-bridge inverter output voltage of the strongly coupled transmitter module.

[0057] In one possible implementation, S1045 may include: 1. Obtain the target output voltage, and determine the first target effective value and the second target effective value based on the target output voltage and the mutual inductance ratio; 2. Calculate the first and second phase shift angles using the third formula; 3. Control the phase shift angle of the strongly coupled transmission module and the weakly coupled transmission module so that the phase shift angle of the strongly coupled transmission module is equal to the first phase shift angle and the phase shift angle of the weakly coupled transmission module is equal to the second phase shift angle; The third formula may include:

[0058]

[0059] in, and These are the first target voltage and the second target voltage, respectively. and These are the effective values ​​of the first target and the effective values ​​of the second target, respectively. and These are the first phase shift angle and the second phase shift angle, respectively.

[0060] The target output voltage is fixed. As can be seen from formula (3), since... , , , , , All are known, and Then it can be calculated that and Meanwhile, as can be seen from formula (1), the voltage of the two full-bridge inverters is only related to the phase shift angle. Therefore, the corresponding phase shift angle can be directly calculated according to the third formula to control the two full-bridge inverters, so that the system can work stably at the optimal point of global transmission efficiency and achieve maximum transmission efficiency.

[0061] Adjusting the phase shift angle will cause the fundamental phases of the two inverter output voltages to become asynchronous, introducing a phase difference. To achieve fundamental phase synchronization of the output voltages of the two full-bridge inverters in the two transmitting modules, precise phase compensation of the drive signal is required. Assume the fundamental phase of the output voltage of the first transmitting module's full-bridge inverter is... Assume the fundamental phase of the full-bridge inverter output voltage of the second transmitting module is... From formula (1), it can be seen that when the phase shift angles of the full-bridge inverters of the two transmitting modules are respectively and At that time, the fundamental phase of the output voltage is respectively and To ensure the fundamental phase of the second transmitting module... Phase with the fundamental wave of the first transmitting module Synchronization requires applying phase compensation to the second transmission module. for: (twenty three) In a digital control system, this phase compensation can be converted into a drive signal offset in the time domain. : (twenty four) when When the value is greater than 0, the drive signal of the second transmitting module is advanced. Seconds. When When <0, the drive signal of the second transmitting module will be delayed. Second.

[0062] In summary, based on the ratio of the effective values ​​of the fundamental voltage output of the full-bridge inverter of the two transmitting modules ( ) equals the ratio of the mutual inductance between the transmitting coil and the receiving coil of the two transmitting modules. To set the phase shift angle of the two full-bridge inverter and (to adjust the voltage ratio), and perform phase compensation according to formula (24) (to ensure in-phase operation), effectively reducing the losses caused by the operation of invalid modules and optimizing the overall energy efficiency of the system.

[0063] In one possible implementation, the above method may further include: S105: Obtain the preset power contribution ratio threshold; S106: The mutual inductance ratio threshold is calculated based on the power contribution ratio threshold and the fourth formula. The fourth formula may include:

[0064] in, The preset power contribution percentage threshold, This is the threshold for the mutual inductance ratio.

[0065] The above method will be described below with reference to specific embodiments.

[0066] The system parameters are shown in Table 1.

[0067] Table 1 System Parameters

[0068] A system model was built based on the parameters in Table 1, and simulation analysis was performed at different mutual inductance ratios. Below, the system transmission efficiency varies with the input voltage ratio of the two transmitting modules. The relationship of change, the result is as follows: Figure 5 As shown.

[0069] Based on the above simulation results, under different coupling conditions (i.e., different...), (Value), system transmission efficiency varies with voltage ratio The increase in efficiency all showed a trend of first rising and then falling, and the maximum efficiency was always within a certain range. This result is consistent with the theoretical derivation and effectively verifies the correctness of the efficiency optimization strategy provided in this application.

[0070] Furthermore, based on the efficiency optimization strategy provided in this application (i.e. When power is supplied, the power contribution ratio of the second transmitting module is... With mutual inductance ratio The relationship of change is as follows Figure 6 As shown.

[0071] Therefore, Value follows It increases monotonically. When When <0.3, A value close to 0 indicates that activating the second transmitting module at this point contributes negligibly to the total system output power. A reasonable module activation threshold needs to be set to avoid activating the transmitting module with extremely low contribution under weak coupling conditions, thereby reducing additional switching losses, drive losses, and copper losses caused by ineffective operation. This paper selects a power contribution percentage... =0.1, according to the relation The corresponding module activation threshold can be obtained. ≈0.57. Based on this, the following activation strategy is formulated: when the identified mutual inductance ratio... < When the mutual inductance ratio is identified, it is determined to be weakly coupled, the weakly coupled transmitting module is not activated, and only the strongly coupled transmitting module is powered; when the mutual inductance ratio is identified... > At the same time, two transmission modules are activated, and an efficiency optimization strategy is implemented. (To provide coordinated power supply)

[0072] This strategy can effectively avoid the losses caused by the ineffective operation of weakly coupled transmission modules while ensuring the system's transmission capacity, thus optimizing the overall energy efficiency of the system.

[0073] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0074] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0075] Figure 7 A schematic diagram of the control device for a dual-transmitter module wireless charging system provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: like Figure 7 As shown, the above-mentioned dual-transmitter module wireless charging system control device is applied to a dual-transmitter module wireless charging system; the dual-transmitter module wireless charging system includes: a first transmitter module and a second transmitter module; the first transmitter module includes: a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; The aforementioned control device includes: The first parameter acquisition module 21 is used to control the lower bridge arm switch of the full-bridge inverter of the second transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, so as to control the full-bridge inverter of the first transmitting module to work normally and acquire the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage. The second parameter acquisition module 22 is used to control the lower bridge arm switch of the full-bridge inverter of the first transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, to control the full-bridge inverter of the second transmitting module to work normally, and to acquire the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage. The mutual inductance ratio output module 23 is used to determine the mutual inductance ratio of the first transmitting module and the second transmitting module based on the first voltage and the second voltage; The charging control module 24 is used to control the first transmitting module and the second transmitting module according to the mutual inductance ratio to achieve coordinated charging.

[0076] In one possible implementation, the mutual inductance ratio output module 23 may include: The first phase difference calculation unit is used to calculate the phase difference between the first voltage and the switching transistor drive signal of the upper left bridge arm of the full-bridge inverter of the first transmitting module, and use it as the first phase difference; The second phase difference calculation unit is used to calculate the phase difference between the second voltage and the drive signal of the switching transistor of the upper left bridge arm of the full-bridge inverter of the second transmitting module, as the second phase difference; The mutual inductance ratio calculation unit is used to determine the mutual inductance ratio based on the first phase difference, the second phase difference, the effective value of the first voltage, and the effective value of the second voltage.

[0077] In one possible implementation, the mutual inductance ratio calculation unit may include: The first calculation subunit is used to calculate the first mutual inductance based on the first phase difference and the effective value of the first voltage, combined with the first formula. The second calculation subunit is used to calculate the second mutual inductance based on the second phase difference and the effective value of the second voltage, combined with the second formula. The third calculation subunit is used to determine the mutual inductance ratio based on the first mutual inductance and the second mutual inductance; wherein the mutual inductance ratio is less than 1. The first formula may include:

[0078] in, For the first mutual intuition, For the system operating frequency, The effective value of the first voltage. This is the DC power supply voltage. The phase shift angle of the first launch module. The value of the compensation inductor for the first transmitting module. The first phase difference, This is the parasitic resistance of the transmitting coil of the first transmitting module. The equivalent resistance before the rectifier bridge at the receiving end. This is the parasitic resistance of the receiving coil; The second formula may include:

[0079] in, For the second mutual induction, This is the effective value of the second voltage. The phase shift angle of the second launch module. The value of the compensation inductor for the second transmitting module. For the second phase difference, This is the parasitic resistance of the transmitting coil of the second transmitting module.

[0080] In one possible implementation, the third computational subunit can be specifically used for: 1. If the first mutual inductance divided by the second mutual inductance is not greater than 1, then the first mutual inductance divided by the second mutual inductance is taken as the mutual inductance ratio; 2. If the first mutual inductance divided by the second mutual inductance is greater than 1, then the second mutual inductance divided by the first mutual inductance is taken as the mutual inductance ratio.

[0081] In one possible implementation, the charging control module 24 may include; The first judgment unit is used to determine whether the first mutual inductance is greater than the second mutual inductance, and to determine whether the first transmitting module is a strongly coupled transmitting module and the second transmitting module is a weakly coupled transmitting module. The second judgment unit is used to determine whether the second transmitting module is a strongly coupled transmitting module and the first transmitting module is a weakly coupled transmitting module if the first mutual inductance is not greater than the second mutual inductance. The third judgment unit is used to enable only the strongly coupled transmission module if the mutual inductance ratio is less than the mutual inductance ratio threshold. The fourth judgment unit is used to simultaneously activate both the strongly coupled transmission module and the weakly coupled transmission module if the mutual inductance ratio is not less than the mutual inductance ratio threshold.

[0082] In one possible implementation, the charging control module 24 may further include; The control adjustment unit is used to control the strongly coupled and weakly coupled transmitting modules when both are turned on simultaneously, so that the ratio of the fundamental effective value of the full-bridge inverter output voltage of the weakly coupled transmitting module to the fundamental effective value of the full-bridge inverter output voltage of the strongly coupled transmitting module is equal to the mutual inductance ratio, and the output voltage of the full-bridge inverter of the weakly coupled transmitting module is in phase with the output voltage of the full-bridge inverter of the strongly coupled transmitting module.

[0083] In one possible implementation, the control adjustment unit may be specifically used for: 1. Obtain the target output voltage, and determine the first target effective value and the second target effective value based on the target output voltage and the mutual inductance ratio; 2. Calculate the first and second phase shift angles using the third formula; 3. Control the phase shift angle of the strongly coupled transmission module and the weakly coupled transmission module so that the phase shift angle of the strongly coupled transmission module is equal to the first phase shift angle and the phase shift angle of the weakly coupled transmission module is equal to the second phase shift angle; The third formula may include:

[0084] in,, and These are the first target voltage and the second target voltage, respectively. and These are the effective values ​​of the first target and the effective values ​​of the second target, respectively. and These are the first phase shift angle and the second phase shift angle, respectively.

[0085] In one possible implementation, the above-described apparatus may further include: The preset parameter acquisition module is used to acquire preset power contribution ratio thresholds; The mutual inductance ratio threshold output module is used to calculate the mutual inductance ratio threshold based on the power contribution ratio threshold and the fourth formula. The fourth formula may include:

[0086] in, The preset power contribution percentage threshold, This is the threshold for the mutual inductance ratio.

[0087] Figure 8 This is a schematic diagram of the control device provided in an embodiment of the present invention. Figure 8 As shown, the control device 3 in this embodiment includes a processor 30 and a memory 31. The memory 31 stores a computer program 32. When the processor 30 executes the computer program 32, it implements the steps in the various method embodiments described above. Alternatively, when the processor 30 executes the computer program 32, it implements the functions of each module / unit in the various device embodiments described above.

[0088] For example, computer program 32 may be divided into one or more modules / units, which are stored in memory 31 and executed by processor 30 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 32 in control device 3.

[0089] The control device 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 8 This is merely an example of control device 3 and does not constitute a limitation on control device 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, control device 3 may also include input / output devices, network access devices, buses, etc.

[0090] The processor 30 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0091] The memory 31 can be an internal storage unit of the control device 3, such as a hard disk or RAM of the control device 3. The memory 31 can also be an external storage device of the control device 3, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the control device 3. Furthermore, the memory 31 can include both internal and external storage units of the control device 3. The memory 31 is used to store the computer program 32 and other programs and data required by the control device 3. The memory 31 can also be used to temporarily store data that has been output or will be output.

[0092] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.

[0093] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0094] This invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0095] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0096] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0097] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method for a dual-transmitter module wireless charging system, characterized in that, Applications in dual-transmitter module wireless charging systems; The dual-transmitter module wireless charging system includes: a first transmitter module and a second transmitter module; the first transmitter module includes: a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; The control method includes: The lower bridge arm switch of the full-bridge inverter of the second transmitting module is kept on while the upper bridge arm switch is turned off, so as to control the full-bridge inverter of the first transmitting module to work normally and obtain the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage. The lower bridge arm switch of the full-bridge inverter of the first transmitting module is kept on while the upper bridge arm switch is turned off, thereby controlling the full-bridge inverter of the second transmitting module to work normally and obtaining the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage. The mutual inductance ratio of the first transmitting module and the second transmitting module is determined based on the first voltage and the second voltage; The first and second transmitting modules are controlled according to the mutual inductance ratio to achieve coordinated charging.

2. The control method for a dual-transmitter module wireless charging system according to claim 1, characterized in that, Determining the mutual inductance ratio of the first transmitting module and the second transmitting module based on the first voltage and the second voltage includes: Calculate the phase difference between the first voltage and the switching transistor drive signal of the upper left bridge arm of the full-bridge inverter of the first transmitting module, and use it as the first phase difference; Calculate the phase difference between the second voltage and the drive signal of the switching transistor of the upper left bridge arm of the full-bridge inverter of the second transmitting module, and use it as the second phase difference; The mutual inductance ratio is determined based on the first phase difference, the second phase difference, the effective value of the first voltage, and the effective value of the second voltage.

3. The control method for a dual-transmitter module wireless charging system according to claim 2, characterized in that, Determining the mutual inductance ratio based on the first phase difference, the second phase difference, the effective value of the first voltage, and the effective value of the second voltage includes: The first mutual inductance is calculated based on the first phase difference and the effective value of the first voltage, combined with the first formula. The second mutual inductance is calculated based on the second phase difference and the effective value of the second voltage, combined with the second formula. The mutual inductance ratio is determined based on the first mutual inductance and the second mutual inductance; wherein the mutual inductance ratio is less than 1. The first formula includes: in, This is the first mutual inductance. For the system operating frequency, The effective value of the first voltage. This is the DC power supply voltage. The phase shift angle of the first transmitting module. The value of the compensation inductor of the first transmitting module. For the first phase difference, The parasitic resistance of the transmitting coil of the first transmitting module is denoted as . The equivalent resistance before the rectifier bridge at the receiving end. This is the parasitic resistance of the receiving coil; The second formula includes: in, This is the second mutual inductance. The effective value of the second voltage. The phase shift angle of the second transmitting module. This is the value of the compensation inductor for the second transmitting module. This is the second phase difference. This is the parasitic resistance of the transmitting coil of the second transmitting module.

4. The control method for the dual-transmitter module wireless charging system according to claim 3, characterized in that, Determining the mutual inductance ratio based on the first mutual inductance and the second mutual inductance includes: If the first mutual inductance divided by the second mutual inductance is not greater than 1, then the first mutual inductance divided by the second mutual inductance is taken as the mutual inductance ratio; If the first mutual inductance divided by the second mutual inductance is greater than 1, then the second mutual inductance divided by the first mutual inductance is taken as the mutual inductance ratio.

5. The control method for a dual-transmitter module wireless charging system according to claim 3, characterized in that, The step of controlling the first transmitting module and the second transmitting module according to the mutual inductance ratio to achieve coordinated charging includes: If the first mutual inductance is greater than the second mutual inductance, then the first transmitting module is designated as a strongly coupled transmitting module, and the second transmitting module is designated as a weakly coupled transmitting module. If the first mutual inductance is not greater than the second mutual inductance, then the second transmitting module is used as the strongly coupled transmitting module, and the first transmitting module is used as the weakly coupled transmitting module. If the mutual inductance ratio is less than the mutual inductance ratio threshold, then only the strongly coupled transmission module is activated; If the mutual inductance ratio is not less than the mutual inductance ratio threshold, then both the strongly coupled transmission module and the weakly coupled transmission module are activated simultaneously.

6. The control method for a dual-transmitter module wireless charging system according to claim 5, characterized in that, The method of controlling the first transmitting module and the second transmitting module according to the mutual inductance ratio to achieve coordinated charging further includes: If both the strongly coupled transmitting module and the weakly coupled transmitting module are turned on simultaneously, the strongly coupled transmitting module and the weakly coupled transmitting module are controlled such that the ratio of the fundamental effective value of the full-bridge inverter output voltage of the weakly coupled transmitting module to the fundamental effective value of the full-bridge inverter output voltage of the strongly coupled transmitting module is equal to the mutual inductance ratio, and the full-bridge inverter output voltage of the weakly coupled transmitting module is in phase with the full-bridge inverter output voltage of the strongly coupled transmitting module.

7. The control method for a dual-transmitter module wireless charging system according to claim 6, characterized in that, The control of the strongly coupled transmitting module and the weakly coupled transmitting module, such that the ratio of the fundamental effective value of the full-bridge inverter output voltage of the weakly coupled transmitting module to the fundamental effective value of the full-bridge inverter output voltage of the strongly coupled transmitting module is equal to the mutual inductance ratio, includes: Obtain the target output voltage, and determine the first target effective value and the second target effective value based on the target output voltage and the mutual inductance ratio; The first phase shift angle and the second phase shift angle are calculated according to the third formula; The phase shift angles of the strongly coupled transmission module and the weakly coupled transmission module are controlled such that the phase shift angle of the strongly coupled transmission module is equal to the first phase shift angle, and the phase shift angle of the weakly coupled transmission module is equal to the second phase shift angle. The third formula includes: in, and These are the first target voltage and the second target voltage, respectively. and These are the effective values ​​of the first target and the effective values ​​of the second target, respectively. and These are the first phase shift angle and the second phase shift angle, respectively.

8. The control method for a dual-transmitter module wireless charging system according to claim 5, characterized in that, The method further includes: Obtain the preset power contribution ratio threshold; The mutual inductance ratio threshold is calculated based on the power contribution ratio threshold and the fourth formula. The fourth formula includes: in, The preset power contribution ratio threshold, The mutual inductance ratio threshold is defined as follows.

9. A control device for a dual-transmitter module wireless charging system, characterized in that, Applications in dual-transmitter module wireless charging systems; The dual-transmitter module wireless charging system includes: a first transmitter module and a second transmitter module; the first transmitter module includes: a full-bridge inverter, an LCC compensation network and a transmitter coil connected in sequence; wherein, the circuit structure of the first transmitter module and the second transmitter module is the same; The control device includes: The first parameter acquisition module is used to control the lower bridge arm switch of the full-bridge inverter of the second transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, to control the full-bridge inverter of the first transmitting module to work normally, and to acquire the voltage of the parallel capacitor in the LCC compensation network of the first transmitting module as the first voltage. The second parameter acquisition module is used to control the lower bridge arm switch of the full-bridge inverter of the first transmitting module to be continuously turned on and the upper bridge arm switch to be turned off, to control the full-bridge inverter of the second transmitting module to work normally, and to acquire the voltage of the parallel capacitor in the LCC compensation network of the second transmitting module as the second voltage. The mutual inductance ratio output module is used to determine the mutual inductance ratio between the first transmitting module and the second transmitting module based on the first voltage and the second voltage; The charging control module is used to control the first transmitting module and the second transmitting module according to the mutual inductance ratio to achieve coordinated charging.

10. A control device, characterized in that, The system includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the dual-transmitter module wireless charging system control method as described in any one of claims 1 to 8.

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