CN116846095A - Voltage stabilizing control method and system for multi-load wireless power transmission system - Google Patents
Voltage stabilizing control method and system for multi-load wireless power transmission system Download PDFInfo
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- CN116846095A CN116846095A CN202310654128.9A CN202310654128A CN116846095A CN 116846095 A CN116846095 A CN 116846095A CN 202310654128 A CN202310654128 A CN 202310654128A CN 116846095 A CN116846095 A CN 116846095A
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 16
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- 230000010363 phase shift Effects 0.000 claims description 31
- 238000012546 transfer Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 6
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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Abstract
The application discloses a voltage stabilizing control method and a system of a multi-load wireless power transmission system, which are implemented by switching a transmitting coil side compensation switch capacitor array C 1 、C 2 Realizing power distribution among different loads, and adjusting phase shifting angle alpha of semi-active rectifier bridge according to given voltage reference value 1 、α 2 And the constant voltage control of the load end is realized. The application has simple control and sensitive response, realizes constant voltage control of the multi-load wireless energy transmission system without complex calculation, and simultaneously realizes power distribution of different load ends.
Description
Technical Field
The application relates to the field of wireless power transmission, in particular to a voltage stabilizing control method and system of a multi-load wireless power transmission system.
Background
The wireless energy transfer technology overcomes some defects of the traditional wired charging technology such as leakage safety, but most of the wireless energy transfer technologies only realize charging of a single load, can not solve the problem that a plurality of loads are charged simultaneously, or can not accurately distribute power to the loads due to different power requirements of different loads. Multi-load wireless energy transfer systems have potential applications in various fields, such as healthcare, transportation, and consumer electronics. For a multi-load wireless energy transmission system, the change of the receiving position of the load and the different characteristics of the load generally cause the change of the receiving power of the load, which affects the transmission efficiency, so that a constant voltage control technology with load independent characteristics is needed to realize the constant receiving power of the load. In addition, there are differences in power requirements of different loads, and how to achieve power distribution among different loads and keep output power stable is needed to be solved.
The existing solution to the fluctuation of the power of the load end is to add a DC-DC converter at the receiving end, and adjust the voltage of the load end through the DC-DC converter to meet the charging power required by the load. However, the cross coupling problem between the receiving coils at the load end will affect the transmission efficiency of the whole system, and the DC-DC converter added at the load end enlarges the volume of the whole system, increases the switching loss of the system, affects the efficiency of the system, and the coil offset easily causes the fluctuation of the load output power. Wireless power transfer tends to be carried to the receiving coil end nearer to the transmitting coil, and power on demand distribution cannot be achieved. The existing power distribution adopts a control algorithm which is too complex, and the implementation process is difficult.
Disclosure of Invention
The application aims to solve the technical problems of providing a voltage stabilizing control method and a system of a multi-load wireless electric energy transmission system aiming at the defects of the prior art,
in order to solve the technical problems, the application adopts the following technical scheme: a voltage stabilizing control method of a multi-load wireless power transmission system comprises a direct current power supply and a plurality of high-frequency half-bridge inverter circuits connected with the direct current power supply; each high-frequency half-bridge inverter circuit is connected with a transmitting coil compensation unit, each transmitting coil compensation unit is connected with a receiving coil compensation unit, each receiving coil compensation unit is connected with a half active rectifying circuit, and each half active rectifying circuit is connected with a load; the method comprises the following steps:
s1, giving a direct current input voltage value, a reference voltage value of each load and an initial value of a phase shift angle of each semi-active rectifying circuit, so that the output voltage of each load reaches a set reference voltage value;
s2, sampling the output voltage of each load, and subtracting the reference voltage value of the output voltage of each load to obtain the voltage difference value of each load;
s3, for any load, if the voltage difference of the load is larger than 0, adjusting the phase shift angle of the semi-active rectifying circuit connected with the load according to the formula alpha (n) =alpha (n-1) -delta alpha; if the voltage difference of the load is smaller than 0, adjusting the phase shift angle of the semi-active rectifying circuit connected with the load according to the formula alpha (n) =alpha (n-1) +delta alpha; if the voltage difference of the load is 0, α (n) =α (n-1); wherein, alpha (n) is the phase shift angle at the moment n, alpha (n-1) is the phase shift angle at the moment n-1, delta alpha is the phase shift angle adjustment quantity of the semi-active rectifying circuit at two adjacent moments, n is more than 1, alpha (1) is the initial value of the corresponding load phase shift angle set in the step S1;
s4, phase shift angles of the semi-active rectifying circuits at the time n are respectively transmitted to a PWM signal generator, required PWM square waves are generated through modulation, and on-off of switching tubes of the semi-active rectifying circuits is controlled.
The application provides a voltage stabilizing control method of a multi-load wireless power transmission system, which can realize stable and efficient power transmission of a multi-frequency multi-load system, and coil compensation units with different resonant frequencies can effectively perform frequency separation so as to realize efficient power supply of loads with different frequencies. The waveform frequency output by the high-frequency half-bridge inverter circuit is adjusted to flexibly adapt to loads with different frequencies, so that the flexibility of system application is improved. The application has simple realization process, and can realize independent power supply and voltage control of any number and any frequency of loads in a certain range only by correspondingly adjusting the phase shift angle of the semi-active rectifier bridge according to the difference value after sampling the load voltage and making a difference with the preset voltage.
In the present application, Δα is set to be pi/180.
In the application, for the time n+1, the steps S2 to S4 are repeated, thereby realizing the real-time voltage stabilizing control.
After step S3 of the present application, the method further includes: the number of the loads is 2, and the output power of the second load is controlled by the following formula:wherein omega i The frequency M of the alternating voltage output by the high-frequency half-bridge inverter circuit 13 、M 14 、M 23 、M 24 Mutual inductance coefficients of two transmitting coils and two receiving coils which are coupled in pairs respectively, R 1 、R 2 Respectively the resistance values of different loads, V i Is the voltage value of a direct-current voltage source, R 1eq And R is 2eq Equivalent load resistance values of two receiving coils respectively, alpha 1 、α 2 The phase shift angles of the two semi-active rectifying circuits are respectively. The formula is used to analyze the phase angle relationship of the output power and the semi-active rectifier bridge.
R 1eq And R is 2eq The calculation formula of (2) is as follows:
voltage value V of dc voltage source i Output voltage U of high-frequency half-bridge inverter circuit 1 The relation between the two is:
as an inventive concept, the present application also provides a voltage stabilizing control system of a multi-load wireless power transmission system, which includes a memory and a processor; the memory has one or more programs stored thereon which, when executed by the one or more processors, cause the one or more processors to implement the steps of the above-described method of the present application.
Compared with the prior art, the application has the following beneficial effects:
1. according to the application, the alternating currents with different frequencies can be simultaneously output by changing the working frequency of the switching tube, so that the load simultaneous working requirements of different working frequencies are met.
2. According to the application, through the characteristic of magnetic resonance wireless energy transfer, the load end can selectively and efficiently receive the alternating current transmitted by the transmitting coil with the same frequency, so that the influence caused by cross coupling is greatly reduced, and the transmission efficiency is improved.
3. The inverter circuit adopts a half-bridge inverter circuit, so that the switching loss is reduced, and the system volume is reduced.
4. The load power under the coil offset condition can be compensated through the phase shift control of the semi-active rectifying circuit, the number of switching tubes to be controlled is reduced, the loss is reduced, and the power distribution among loads is realized through adjusting the resonant frequency of the transmitting coil.
Drawings
Figure 1 is a schematic circuit diagram of a multi-frequency, multi-load magnetic resonance wireless energy transfer system in accordance with an embodiment of the present application;
figure 2 is an equivalent circuit diagram of a multi-frequency, multi-load magnetic resonance wireless energy transfer system in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a system for implementing voltage regulation control and power distribution for a multi-load magnetic resonance wireless energy transfer system according to an embodiment of the present application;
FIG. 4 is a block flow diagram of an embodiment of the present application for implementing load side voltage constant voltage control;
FIG. 5 is a spectrum analysis chart of a resonance current of a receiving end with a resonance frequency of 85kHz of the multi-load magnetic resonance wireless energy transmission system according to the embodiment of the application;
FIG. 6 is a spectrum analysis chart of a resonance current of a receiving end with a resonance frequency of 120kHz of the multi-load magnetic resonance wireless energy transmission system according to the embodiment of the application;
figure 7 is a waveform diagram of load voltage of a multi-load magnetic resonance wireless energy transfer system in accordance with an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a block diagram of a wireless energy transfer system according to an embodiment of the present application. The system of the present embodiment is directed to achieving power distribution and coil offset voltage compensation for a multi-frequency, multi-load wireless energy transfer system. For simplicity and clarity of analysis, the embodiment of the application takes a dual-load dual-frequency system as an example for analysis, and can be applied to a system with multiple loads and multiple receiving coils. The whole system is composed of a high-frequency inverter circuit, a transmitting coil resonant circuit, a receiving coil resonant circuit and a receiving side semi-active rectifying circuit. U (U) i Is a direct current power supply and is used for driving a high-frequency inversion half bridge and generating a high-frequency voltage square wave. S is S 1 -S 4 The two inverter half bridge arms are formed by mos tubes, and square wave voltages with different frequencies are generated by driving and controlling the on-off of the switching tube. C (C) 1 、C 2 Resonant compensation capacitor switch array for transmitting coil, L 1 、L 2 And the self-inductance of the transmitting coils respectively. C (C) 3 、C 4 Resonance compensation capacitors, L, of the receiving coils, respectively 3 、L 4 And the self inductance of the receiving coils respectively. D (D) 1 、D 3 、D 5 、D 7 Switching diodes, D, respectively, of semi-active rectifying full-bridge circuits 2 、D 4 、D 6 、D 8 Four switching mos transistors of the semi-active rectifying circuit, respectively. C (C) A 、C B And the voltage stabilizing filter capacitors are respectively used for the two load receiving loops. R is R 1 、R 2 The load resistances of the two loops are respectively.
In the embodiment of the application, the primary side is connected with m high-frequency inversion half-bridge circuits in parallel by a direct-current power supply, each inversion half-bridge circuit is provided with a switching tube working frequency corresponding to the resonance frequency of a load end, and the transmitting end has alternating currents with different frequencies. The receiving end resonant circuit is provided with corresponding resonant frequency, so that the cross coupling influence between receiving coils can be eliminated, and the accurate transmission of electric energy with corresponding frequency is realized. The power ratio between loads can be realized by adjusting the switch capacitor array to change the resonant frequency of the transmitting coil. The output power constant function is realized by performing phase shift control on the semi-active rectifying circuit.
Further, the inverter circuit on the primary side is a half-bridge inverter circuit formed by two switching tubes.
Fig. 2 is an equivalent circuit model of the system.
For convenience of analysis, only the fundamental component is considered. An equivalent circuit diagram based on the basic harmonic analysis method is shown in fig. 2. Wherein V is i Is the amplitude of a direct current voltage source, U 1 、U 2 AC voltage fundamental wave respectively output by two inversion half-bridges, I 1 And I 2 The resonant currents of the transmit coil loops respectively,and->Respectively, the resonant currents of the receiving coil loop at different frequencies, R 1eq And R is 2eq The equivalent load resistance values of the receiving coil loops are respectively.
The inverter half-bridge voltage output U can be represented according to the fundamental wave analysis method 1 、U 2 The method comprises the following steps:
the equivalent resistance value of the load at the receiving rectifying side is as follows:
wherein alpha is 1 、α 2 The phase shift angles of the different semi-active rectifiers on the receiving side are respectively.
The transmit coil and receive coil loop voltage equations can be listed according to kirchhoff's voltage law:
wherein Z is 1 、Z 2 Respectively, the loop impedance of the transmitting coil, Z 3 、Z 4 Respectively, receiving coil loop impedance, M 13 、M 14 、M 23 、M 24 Mutual inductance between different transmitting coils and receiving coils (mutual inductance between two transmitting coils and mutual inductance between two receiving coils are ignored), ω i Representing different system frequencies.
When the whole transmission system generates series resonance, the capacitance and inductance impedance are completely compensated, and the loop impedance values of the transmitting coil and the receiving coil are respectively as follows:
Z 1 ＝Z 2 ＝0
Z 3 ＝R 1eq Z 4 ＝R 2eq
solving kirchhoff voltage method equations of the receiving coil and the transmitting coil can obtain effective current values of all loops as follows:
an expression of the load output power can be derived:
phase shift angle alpha 1 、α 2 In the range of [0, pi ]]. The output power respectively carries out derivative analysis on phase shift angles:
it is easy to analyze in the range of phase shift angles,from the derivation, the output power P of the load 1 can be known 1 From alpha alone 1 And with alpha 1 Exhibits a tendency to rise in the increased output power; similarly, the output power P of the load 2 is available 2 From alpha alone 2 And with alpha 2 Exhibits a tendency to rise in the increased output power.
Fig. 3 and 4 are a semi-active rectifier control method and a specific flow, respectively. The specific load voltage control steps are as follows:
s1: given a DC input voltage V i In the present embodiment, the input voltage is set to 750V. Setting reference voltage value V of two loads ref1 、V ref2 450V and 380V, respectively. Given phase shift angle alpha 1 、α 2 An initial value of 0 to enable the output voltage of the load to reach a set reference voltage value V ref1 、V ref2 。
S2: output voltage V to load respectively o1 、V o2 Sampling is carried out, and an output voltage sampling value V o1 、V o2 Respectively input a voltage comparator and a reference voltage value V ref1 、V ref2 Comparing and obtaining voltage difference delta V of different loads 1 And DeltaV 2 . Wherein DeltaV 1 ＝V o1 -V ref1 ，ΔV 2 ＝V o2 -V ref2 。
S3: the voltage difference DeltaV obtained in S2 1 And DeltaV 2 Respectively input into the load voltage controllers to respectively judge the voltage difference DeltaV 1 And DeltaV 2 Whether greater than 0. If so, the phase shift angle α (n) =α (n-1) - Δα is adjusted, and the value of time n is increased by 1. If not, judging the voltage difference delta V 1 And DeltaV 2 Whether or not less than 0. Delta alpha is the phase shift angle adjustment quantity of the semi-active rectifying circuit at two adjacent moments.
S4: if the voltage difference DeltaV is judged 1 And DeltaV 2 Less than 0, the phase shift angle α (n) =α (n-1) +Δα is adjusted, and the value of time n is added with 1; if not, the output voltage is equal to the reference voltage, the phase shift angle is not required to be adjusted, and the value of the moment n is increased by 1.
S5: and the phase shift angles of the semi-active rectifying circuit are obtained through the output of the voltage controller, and are respectively transmitted to the PWM signal generator to be modulated to generate the required PWM square wave.
S6: after the above steps are completed, the process continues to return to step S2, and real-time monitoring is performed on the load voltage to ensure that the output voltage and the output power are maintained at ideal values.
Fig. 5 and 6 are spectral analysis diagrams of the resonant currents of two receiving loops at different resonant frequencies, respectively. As can be seen from the spectrum analysis chart, the main frequency component of the first loop is 85kHz; the main frequency component of the second loop is 120kHz. According to the result of the spectrum analysis chart, the resonant circuit design of the system well eliminates the cross coupling of coils, greatly reduces the interference of other harmonics, realizes the directional transmission of power and realizes the wireless charging requirement for load identification.
Fig. 7 is a simulation waveform of the load terminal voltage of two receiving terminals. According to the simulation waveform, the voltage stabilizing control of the system can be analyzed and known to be realized. When the load voltage fluctuates, the system can adjust the load end voltage to the working voltage through closed-loop phase-shifting control, and the function of voltage stabilization control is realized.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. A voltage stabilizing control method of a multi-load wireless power transmission system comprises a direct current power supply and a plurality of high-frequency half-bridge inverter circuits connected with the direct current power supply; each high-frequency half-bridge inverter circuit is connected with a transmitting coil compensation unit, each transmitting coil compensation unit is connected with a receiving coil compensation unit, each receiving coil compensation unit is connected with a half active rectifying circuit, and each half active rectifying circuit is connected with a load; characterized in that the method comprises the following steps:
s1, giving a direct current input voltage value, a reference voltage value of each load and an initial value of a phase shift angle of each semi-active rectifying circuit, so that the output voltage of each load reaches a set reference voltage value;
s2, sampling the output voltage of each load, and subtracting the reference voltage value of the output voltage of each load to obtain the voltage difference value of each load;
s3, for any load, if the voltage difference of the load is larger than 0, adjusting the phase shift angle of the semi-active rectifying circuit connected with the load according to the formula alpha (n) =alpha (n-1) -delta alpha; if the voltage difference of the load is smaller than 0, adjusting the phase shift angle of the semi-active rectifying circuit connected with the load according to the formula alpha (n) =alpha (n-1) +delta alpha; if the voltage difference of the load is 0, α (n) =α (n-1); wherein, alpha (n) is the phase shift angle at the moment n, alpha (n-1) is the phase shift angle at the moment n-1, delta alpha is the phase shift angle adjustment quantity of the semi-active rectifying circuit at two adjacent moments, n is more than 1, alpha (1) is the initial value of the corresponding load phase shift angle set in the step S1;
s4, phase shift angles of the semi-active rectifying circuits at the time n are respectively transmitted to a PWM signal generator, required PWM square waves are generated through modulation, and on-off of switching tubes of the semi-active rectifying circuits is controlled.
2. The voltage stabilizing control method of a multi-load wireless power transmission system according to claim 1, wherein Δα is set to pi/180.
3. The voltage stabilizing control method of multi-load wireless power transmission system according to claim 1, wherein steps S2 to S4 are repeated for time n+1.
4. The voltage stabilizing control method of a multi-load wireless power transmission system according to claim 1, further comprising, after step S3:
the number of the loads is 2, and the output power of the second load is controlled by the following formula:
wherein omega i The frequency M of the alternating voltage output by the high-frequency half-bridge inverter circuit 13 、M 14 、M 23 、M 24 Mutual inductance coefficients of two transmitting coils and two receiving coils which are coupled in pairs respectively, R 1 、R 2 Respectively the resistance values of different loads, V i Is the voltage value of a direct-current voltage source, R 1eq And R is 2eq Equivalent load resistance values of two receiving coils respectively, alpha 1 、α 2 The phase shift angles of the two semi-active rectifying circuits are respectively.
5. The method for voltage regulation control of a multi-load wireless power transfer system of claim 4 wherein R 1eq And R is 2eq The calculation formula of (2) is as follows:
6. the method for voltage regulation control of a multi-load wireless power transfer system of claim 4 wherein the DC voltage source has a voltage value V i Output voltage U of high-frequency half-bridge inverter circuit 1 The relation between the two is:
7. the voltage stabilizing control system of the multi-load wireless power transmission system is characterized by comprising a memory and a processor; the memory having stored thereon one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the steps of the method of any of claims 1 to 6.
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