CN111898289B - LCC-S topological parameter design method for remote wireless charging - Google Patents
LCC-S topological parameter design method for remote wireless charging Download PDFInfo
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Abstract
The invention discloses a remote wireless charging LCC-S topological parameter design method, which comprises the following steps: (1) setting target parameters; (2) Calculating the minimum efficiency required to be met by the resonator according to design requirements; (3) Establishing an LCC-S equivalent circuit based on a mutual inductance equivalent model, and analyzing to obtain constraint relations between circuit parameters and current, input power, output power and efficiency of each branch circuit; (4) Designing parameters of a magnetic coupling mechanism under the condition of long-distance transmission; (5) designing parameters of a primary side compensation inductor (capacitor); (6) Calculating compensation inductance loss, eddy current loss, magnetic hysteresis loss and capacitance loss; (7) Calculating the efficiency of the resonator and comparing the efficiency with a target set value, wherein if the designed efficiency of the resonator is more than or equal to the target set efficiency, the designed parameter value meets the target parameter setting requirement; otherwise, the parameters need to be redesigned by returning to the step (4). The invention is used for promoting the application universality and the economical efficiency of the wireless power transmission technology.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a remote wireless charging LCC-S topological parameter design method.
Background
The Wireless Power Transmission (WPT) technology has the advantages of simple and safe charging mode, and has a wide development prospect in the fields of military, civil use, and the like. With the increasing application of the wireless power transmission distance in military, the requirements on the transmission distance and efficiency are also increased, however, the existing wireless charging technology can only realize the energy transmission at a medium distance (10 cm-50 cm), the transmission capability at a long distance (50 cm-200 cm) is poor, and the longer the transmission distance is, the poorer the electromagnetic field coupling capability is, the lower the effective utilization rate of the power is, which greatly limits the wide application of the wireless power transmission technology. Therefore, a parameter design method of a wireless charging system is needed to realize long-distance and high-efficiency transmission of energy, so as to improve the application universality and economy of the wireless power transmission technology.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a remote wireless charging LCC-S topological parameter design method which is used for promoting the application universality and the economical efficiency of a wireless power transmission technology.
The purpose of the invention is realized by the following technical scheme:
a long-distance wireless charging LCC-S topological parameter design method comprises the following steps:
(1) Setting target parameters: load received power P of wireless charging system L System efficiency eta, and transmitting end rectification inversion efficiency eta 1 Secondary coil rectification and DC-DC efficiency eta 3 System working frequency f and transmission distance d between magnetic coupling mechanisms;
(2) Calculating the minimum efficiency eta required to be met by the resonator according to the design requirement 2 ；
(3) Establishing an LCC-S equivalent circuit based on a mutual inductance equivalent model, and analyzing to obtain constraint relations between circuit parameters and current, input power, output power and efficiency of each branch circuit;
(4) Designing parameters of the magnetic coupling mechanism under the long-distance transmission condition to obtain better self-inductance and mutual inductance parameters of the magnetic coupling mechanism;
(5) Designing primary side compensation inductance (capacitance) parameters, and calculating to obtain the output current of the inverter power supply and the current of a receiving and transmitting coil;
(6) Calculating compensation inductance loss, eddy current loss, magnetic hysteresis loss and capacitance loss;
(7) Calculating the efficiency of the resonator and comparing the efficiency with a target set value, wherein if the designed efficiency of the resonator is more than or equal to the target set efficiency, the designed parameter value meets the target parameter setting requirement; and (4) if the resonator efficiency obtained by design is less than the target set efficiency, returning to the step (4) to redesign the parameters.
The LCC-S topological parameter design method for long-distance wireless charging comprises the step (2) of calculating the minimum efficiency eta required to be met by a resonator according to design requirements 2 The specific method comprises the following steps:
according to the rectification inversion efficiency eta of the transmitting terminal 1 Secondary coil rectification and DC-DC efficiency eta 3 And the required wireless charging system efficiency requirement η calculated harmonicMinimum efficiency eta required for vibration oscillator 2 The calculation formula is as follows:
the LCC-S topology parameter design method for remote wireless charging comprises the specific steps of (3) establishing an LCC-S equivalent circuit based on a mutual inductance equivalent model, and analyzing and obtaining constraint relations among circuit parameters, branch currents, input power, output power and efficiency, wherein the specific steps are as follows:
in order to make the primary and secondary coils all in resonance state, then:
from the KVL equation:
solving to obtain:
thus, the primary input power P is solved in Load received power P L And the system efficiency η is respectively:
in formulae (2) to (8), Z f Is the impedance of the branch in which the input power is located, Z 1 And Z 2 The impedance of the branch where the primary coil and the secondary coil are respectively located; u is the input voltage of the resonance compensation network; l is P 、L S Self-inductance of primary and secondary coils, respectively, L f Compensating the inductance for the primary side; c P 、C f A primary coil resonance compensation capacitor and a primary compensation capacitor, C S A resonance compensation capacitor for the secondary coil; m is the mutual inductance of the magnetic coupling mechanism; r P 、R S 、R f The internal resistances of the primary coil, the secondary coil and the compensation inductor are respectively; r is L Is a load resistor; omega is angular frequency, I is power supply input current, I 1 And I 2 Current flowing through the primary coil and the secondary coil, respectively; j is an imaginary number.
The LCC-S topology parameter design method for long-distance wireless charging is characterized in that the specific method for designing the parameters of the magnetic coupling mechanism under the long-distance transmission condition to obtain the optimal self-inductance and mutual-inductance parameters of the magnetic coupling mechanism in the step (4) is as follows: according to the working frequency and transmission distance of the system, parameter requirements are set, an electromagnetic simulation model of the wireless charging system magnetic coupling mechanism under the remote transmission condition is established in ANSYS, the established simulation model comprises a coil and a ferrite, self-inductance and mutual inductance values of different magnetic coupling mechanism sizes and turns are obtained through simulation in a parameter scanning mode, and then the relation between the efficiency increment and the mutual inductance increment is obtained through combining efficiency calculation formulas in formulas (6) to (8), so that better self-inductance and mutual inductance parameter values of the magnetic coupling mechanism are obtained through preferential selection.
The long-distance wireless charging LCC-S topological parameter design method comprises the step (5) of designing a primary side compensation inductance parameter L f The specific method comprises the following steps: analysis of L according to the calculation formulas in formulas (6) to (8) f The influence of parameter selection on system efficiency and output power, the received power of load is ensured andand the optimal primary side compensation inductance value is obtained on the basis of the lowest compensation inductance loss.
The LCC-S topological parameter design method for remote wireless charging comprises the following specific steps of calculating and compensating inductance loss, eddy current loss, hysteresis loss and capacitance loss in the step (6):
calculating according to the designed LCC-S parameter and the formula (5) to obtain the calculation formula of each branch current according to P f ＝I 2 R f Obtaining compensation inductance loss, wherein the internal resistance of the compensation inductance is estimated by adopting a laboratory measurement method or a method communicated with a manufacturer, and eddy current loss and hysteresis loss in the magnetic coupling mechanism and the compensation inductance are obtained by ANSYS simulation; the capacitance loss is calculated by the following formula:
wherein, P f Compensating for losses of inductance, W, at primary side c Is the loss power of the capacitor, P is the active power of the capacitor, Q is the reactive power of the capacitor, tan σ is the loss tangent angle of the capacitor, f is the operating frequency of the circuit, U C Is the voltage across the capacitor, and C is the capacitance of the capacitor.
Drawings
FIG. 1 is a flow chart of LCC-S topology parameter design for remote, high efficiency wireless charging;
FIG. 2 is an LCC-S topology mutual inductance equivalent model diagram.
Detailed Description
The design method of the present invention will be further explained with reference to the drawings and the embodiments.
(1) Calculating the minimum efficiency eta required to be met by the resonator according to the design requirement 2 ；
According to the rectification and inversion efficiency eta of the transmitting terminal 1 Secondary coil rectification and DC-DC efficiency eta 3 And the required wireless charging system efficiency requirement eta calculates the minimum efficiency eta that the resonator needs to achieve 2 The calculation formula is as follows:
(2) Establishing an LCC-S equivalent circuit based on a mutual inductance equivalent model, and analyzing to obtain constraint relations between circuit parameters and current, input power, output power and efficiency of each branch circuit;
the LCC-S topology mutual inductance equivalent model is shown in FIG. 2, wherein Z f Is the impedance of the branch in which the input power is located, Z 1 And Z 2 The impedance of the branch where the primary coil and the secondary coil are respectively located; u is the input voltage of the resonance compensation network; l is P 、L S Self-inductance of primary and secondary coils, respectively, L f Compensating the inductance for the primary side; c P 、C f A primary coil resonance compensation capacitor and a primary compensation capacitor, C S A resonance compensation capacitor for the secondary coil; m is the mutual inductance of the magnetic coupling mechanism; r is P 、R S 、R f The internal resistances of the primary coil, the secondary coil and the compensation inductor are respectively; r is L Is a load resistor; omega is angular frequency, I is power supply input current, I 1 And I 2 Current flowing through the primary coil and the secondary coil, respectively; j is an imaginary number.
In order to make the primary and secondary coils in resonance state, then
From KVL equation
Wherein Z is f Is the impedance of the branch in which the input power is located, Z 1 And Z 2 Primary and secondary windings respectivelyImpedance at the branch where the loop is located.
Solve to obtain
Therefore, the primary side input power, the load output power and the load efficiency can be solved to be respectively
(3) Parameters such as the size, the number of turns and the like of the magnetic coupling mechanism under the long-distance transmission condition are designed, and the self-inductance and mutual-inductance parameters of the magnetic coupling mechanism are obtained;
the magnetic coupling mechanism is used as an important component for realizing wireless energy transmission, and the advantages and disadvantages of the magnetic coupling mechanism are related to the performance of the whole wireless charging system. Therefore, an electromagnetic simulation model of the wireless charging system magnetic coupling mechanism under the remote transmission condition needs to be established in ANSYS according to the requirements of the operating frequency and the transmission distance of the system on set parameters, and the established simulation model comprises a coil and a ferrite. Self-inductance and mutual inductance values of different magnetic coupling mechanism sizes and turns are obtained through parameter scanning simulation, and then the relation between the efficiency increment and the mutual inductance increment is obtained through combining the efficiency calculation formulas in the formulas (6) to (8), so that better self-inductance and mutual inductance parameter values of the magnetic coupling mechanism are obtained through preferential selection.
After the magnetic coupling mechanism is determinedSecondary coil self-inductance L P And L S And after the mutual inductance value M, calculating the internal resistance of the coil. According to the existing reference and IEC standard IEC-60287, the following two calculation formulas of the AC resistance of the high-frequency litz wire can be respectively obtained:
where ρ represents the litz wire resistivity (ρ =1.75 × 10 for copper wire) -8 Ω · m), l being the length of the litz wire, N S Is the number of strands of litz wire, D W And D S The diameters of the litz wire and the single solid core wire, respectively, are given in cm, and f is the frequency of the current flowing through the litz wire.
R ac ＝R d (1+y s ) (10)
Wherein x is 2 ＝8πf×10 -7 /ρ d ,ρ d For DC resistivity, the AC resistance increases with increasing f, but the trend increases more slowly with increasing frequency, R d Is a direct current resistance, R ac Is an AC resistor
According to the formula (9), the loss increases exponentially with the increase of the frequency, and according to the laboratory test result, the resistance does not accord with the exponential growth rule, so the calculation is carried out by adopting the formulas (10) and (11) when the alternating current resistance is calculated.
In addition, two coefficients also need to be corrected in the litz wire alternating current resistance calculation process, wherein one is the stranding length coefficient of the multi-strand litz wire, the resistance needs to be multiplied by 1.1-1.15, and the number of times of stranding is determined; and secondly, the alternating current-direct current resistance ratio, and the two coefficients can provide data by contacting a manufacturer after the litz wire model selection is determined.
(4) Designing primary side compensation inductance (capacitance) parameters, and calculating to obtain the output current of the inverter power supply and the current of a transmitting-receiving coil;
after the parameters of the magnetic coupling mechanism are designed and the self inductance and mutual inductance values of the primary coil and the secondary coil are obtained, the compensation inductance parameters in the primary LCC also need to be designed, and the following principles need to be considered:
(1) according to the calculation formulas in formulas (6) to (8), the compensation inductance L is obtained f Size of itself does not affect the size of the system efficiency, but L f Will have a resistance value of L f The larger the resistance value, and L f The larger the current of the inverter power supply is, the smaller the current of the inverter power supply is, and the current of the transmitting coil and the current of the receiving coil are reduced, so that the value of L needs to be adjusted, and the product of the square of the current and the resistance is smaller.
(2) Inductor L f This increase in inductance L leads to a decrease in the current of the transmitter coil, which naturally leads to a decrease in the secondary current, which in turn leads to a decrease in the received power of the load f The value of (a) needs to guarantee the design requirement of the load receiving power.
Based on the principle, under the condition of known parameters, the compensation inductance parameter value is adjusted to obtain the variation trend of the inverter power supply current and the system loss along with the compensation inductance, the optimal mutual inductance value is selected on the premise of meeting the output power requirement, and the inverter power supply output current and the receiving and transmitting coil current can be further calculated.
(5) Calculating compensation inductance loss, eddy current loss, magnetic hysteresis loss and capacitance loss;
after the wireless charging LCC-S parameters are designed, in order to obtain the resonator efficiency through calculation, the internal resistance loss of a coil of the magnetic coupling mechanism is considered, and the compensation inductance, the eddy current loss and the hysteresis loss in the magnetic coupling mechanism and the capacitance loss need to be considered.
The rough internal resistance value can be estimated by measuring the internal resistance loss of the compensation inductor in a laboratory and communicating with a manufacturer; eddy current loss and hysteresis loss in the compensation inductance and the magnetic coupling mechanism can be obtained through ANSYS simulation; the capacitance loss can be calculated using the following equation:
wherein, W c Is the loss power of the capacitor, P is the active power of the capacitor, Q is the reactive power of the capacitor, tan σ is the loss tangent angle of the capacitor, f is the operating frequency of the circuit, U C Is the voltage across the capacitor, and C is the capacitance of the capacitor.
(6) Calculating the efficiency of the resonator and comparing the efficiency with a target set value, wherein if the designed efficiency of the resonator is more than or equal to the target set efficiency, the designed parameter value meets the parameter setting requirement; and (5) if the resonator efficiency obtained by design is less than the target set efficiency, returning to the step (4) to redesign the parameters.
Claims (6)
1. A remote wireless charging LCC-S topological parameter design method is characterized by comprising the following steps: the method comprises the following steps:
(1) Setting target parameters: load received power P of wireless charging system L System efficiency eta, and transmitting end rectification inversion efficiency eta 1 Secondary coil rectification and DC-DC efficiency eta 3 The system working frequency f and the transmission distance d between the magnetic coupling mechanisms;
(2) Calculating the minimum efficiency eta required to be met by the resonator according to the design requirement 2 ；
(3) Establishing an LCC-S equivalent circuit based on a mutual inductance equivalent model, and analyzing to obtain constraint relations among circuit parameters, the current of each branch, the input power, the output power and the efficiency;
(4) Designing parameters of a magnetic coupling mechanism under a long-distance transmission condition to obtain better self-inductance and mutual-inductance parameters of the magnetic coupling mechanism;
(5) Designing primary side compensation inductance (capacitance) parameters, and calculating to obtain the output current of the inverter power supply and the current of a transmitting-receiving coil;
(6) Calculating compensation inductance loss, eddy current loss, hysteresis loss and capacitance loss;
(7) Calculating the efficiency of the resonator and comparing the efficiency with a target set value, wherein if the designed efficiency of the resonator is more than or equal to the target set efficiency, the designed parameter value meets the target parameter setting requirement; and (5) if the resonator efficiency obtained by design is less than the target set efficiency, returning to the step (4) to redesign the parameters.
2. The LCC-S topology parameter design method of claim 1, wherein: calculating the minimum efficiency eta required to be met by the resonator according to the design requirement in the step (2) 2 The specific method comprises the following steps:
according to the rectification and inversion efficiency eta of the transmitting terminal 1 Secondary coil rectification and DC-DC efficiency eta 3 And the required wireless charging system efficiency requirement eta calculates the minimum efficiency eta that the resonator needs to achieve 2 The calculation formula is as follows:
3. the LCC-S topology parameter design method of claim 1, wherein: the specific method for establishing the LCC-S equivalent circuit based on the mutual inductance equivalent model in the step (3) and analyzing and obtaining the constraint relation among the circuit parameters, the current of each branch, the input power, the output power and the efficiency is as follows:
in order to make the primary and secondary coils all in resonance state, then:
from the KVL equation:
solving to obtain:
thus, the solution yields the primary input power P in Load received power P L And the system efficiency η is respectively:
in formulae (2) to (8), Z f Is the impedance, Z, of the branch in which the input power is located 1 And Z 2 The impedances of the branches where the primary coil and the secondary coil are located are respectively; u is the input voltage of the resonance compensation network; l is a radical of an alcohol P 、L S Self-inductance of primary and secondary windings, respectively, L f Compensating the inductance for the primary side; c P 、C f A primary coil resonance compensation capacitor and a primary compensation capacitor, C S A resonance compensation capacitor for the secondary coil; m is the mutual inductance of the magnetic coupling mechanism; r is P 、R S 、R f The internal resistances of the primary coil, the secondary coil and the compensation inductor are respectively; r L Is a load resistor; omega is angular frequency, I is power supply input current, I 1 And I 2 Current flowing through the primary coil and the secondary coil, respectively; j is an imaginary number.
4. The LCC-S topology parameter design method of claim 1, wherein: the specific method for designing the parameters of the magnetic coupling mechanism under the long-distance transmission condition to obtain the optimal self-inductance and mutual inductance parameters of the magnetic coupling mechanism in the step (4) is as follows: according to the working frequency and transmission distance setting parameter requirements of the system, an electromagnetic simulation model of the wireless charging system magnetic coupling mechanism under the remote transmission condition is established in ANSYS, the established simulation model comprises a coil and a ferrite, self-inductance and mutual inductance values of different magnetic coupling mechanism sizes and turns are obtained through simulation in a parameter scanning mode, and then the relation between the efficiency increment and the mutual inductance increment is obtained by combining efficiency calculation formulas in formulas (6) to (8), so that better self-inductance and mutual inductance values of the magnetic coupling mechanism are obtained through preferential selection.
5. The LCC-S topology parameter design method of claim 1, wherein: designing the primary side compensation inductance parameter L in the step (5) f The specific method comprises the following steps: analysis of L according to the calculation formulas in formulas (6) to (8) f The influence of parameter selection on system efficiency and output power is obtained on the basis of ensuring load receiving power and lowest compensation inductance loss to obtain the optimal primary side compensation inductance value.
6. The LCC-S topology parameter design method of claim 1, wherein: the specific method for calculating and compensating the inductance loss, the eddy current loss, the hysteresis loss and the capacitance loss in the step (6) is as follows:
calculating to obtain a calculation formula of each branch current according to formula (5) and the LCC-S parameter obtained by design and according to P f ＝I 2 R f Obtaining compensation inductance loss, wherein the internal resistance of the compensation inductance is estimated by adopting a laboratory measurement method or a method communicated with a manufacturer, and eddy current loss and hysteresis loss in the magnetic coupling mechanism and the compensation inductance are obtained by ANSYS simulation; the capacitance loss is calculated by the following formula:
wherein, P f Compensating for losses of inductance, W, at primary side c Is the loss power of the capacitor, P is the active power of the capacitor, Q is the reactive power of the capacitor, tan σ is the loss tangent angle of the capacitor, f is the operating frequency of the circuit, U C Is the voltage across the capacitor, and C is the capacitance of the capacitor.
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