CN108988506B - PT symmetrical wireless power transmission circuit and construction method thereof - Google Patents
PT symmetrical wireless power transmission circuit and construction method thereof Download PDFInfo
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- CN108988506B CN108988506B CN201811004830.6A CN201811004830A CN108988506B CN 108988506 B CN108988506 B CN 108988506B CN 201811004830 A CN201811004830 A CN 201811004830A CN 108988506 B CN108988506 B CN 108988506B
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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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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Abstract
The PT symmetrical wireless power transmission circuit comprises a resonance unit, a load end and an inverter circuit, wherein the load end is connected with the secondary side of the resonance unit in parallel, the inverter circuit is connected with the primary side of the resonance unit, and the resonance unit comprises a first resonance inductor L1A second resonant inductor L2A first capacitor C1And a second capacitor C2Wherein the first resonant inductor L1And a first capacitor C1Connected to form a parallel circuit; a first capacitor C1Is connected with a primary side series resistor RfOne end of (1), the primary side series resistance RfThe other end of the voltage-stabilizing circuit is connected with the output end of the inverter circuit; second resonant inductor L2And a second capacitor C2Connected to form a parallel circuit, a second capacitor C2Is connected with a load impedance RLOne terminal of (1), load impedance RLThe other end of the first end is connected with a load end; when the PT of the circuit is symmetrical, the whole system has high-speed frequency dynamic regulation capacity, the resonance state of the circuit is ensured, the output voltage is stable and unchanged, and meanwhile, high-efficiency wireless power transmission is kept.
Description
Technical Field
The invention belongs to the field of power electronic research, and particularly relates to a PT symmetrical wireless power transmission circuit and a construction method thereof.
Background
Compared with a mode of energy transmission through a metal wire, the wireless power transmission has the advantages of convenience, durability, applicability in special occasions and the like, and the wireless power transmission has no defects that the transmission medium is easy to age and lose, and sparks are generated due to friction in the transmission process to influence the service life of equipment and the electricity safety. Therefore, the method has wide application prospects in the aspects of charging of mobile terminals and electric automobiles, power supply of medical equipment implanted in bodies and the like, and the problem of transmission power of the method is more important in engineering practice.
In order to control the transmission power of the wireless power transmission system to be constant, related scholars at home and abroad also provide solutions. The disclosed invention patent "method and apparatus for controlling interference in a wireless power transmission system" invented an interference control method of a Power Transmission Unit (PTU) that can determine whether the PTU is in an interference environment in which a neighboring PTU occurs and finally control communication parameters of either or both of the neighboring PTU and a power reception unit PRU in response to the determination that the PTU is in the interference environment. The published patent of invention harmonic reduction device for wireless power transfer system, designs an apparatus of a harmonic reduction device coupled between a switching network and a transmitter coil, the harmonic reduction device configured to attenuate at least one frequency component.
The control methods mentioned in the above patents are few patents aiming at the problem of constant transmission power of wireless power transmission systems, but these methods can only control the output power by adding an additional regulating unit, and cannot keep the output power constant.
Disclosure of Invention
The invention aims to provide a PT symmetrical wireless power transmission circuit and a construction method thereof, and solves the problem that the constant transmission power method of the existing wireless power transmission system cannot be applied under the condition of transmission distance change.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a PT symmetrical wireless power transmission circuit, which comprises a resonance unit, a load end and an inverter circuit, wherein the load end is connected with the secondary side of the resonance unit in parallel, the inverter circuit is connected with the primary side of the resonance unit, and the inverter circuit is connected with the primary side of the resonance unit,
the resonant unit comprises a first resonant inductor L1A second resonant inductor L2A first capacitor C1And a second capacitor C2Wherein the first resonant inductor L1And a first capacitor C1Connected to form a parallel circuit; a first capacitor C1Is connected with a primary sideSeries resistance RfOne end of (1), the primary side series resistance RfThe other end of the voltage-stabilizing circuit is connected with the output end of the inverter circuit;
second resonant inductor L2And a second capacitor C2Connected to form a parallel circuit, a second capacitor C2Is connected with a load impedance RLOne terminal of (1), load impedance RLThe other end of which is connected to the load end.
Preferably, the wireless power transmission circuit has PT symmetry condition, i.e.
Wherein k isminIs the minimum coupling coefficient between the first resonant inductor L1 and the second resonant circuit L2.
Preferably, a phase-locked loop is disposed between the inverter circuit and the resonance unit.
Preferably, the inverter circuit is a single-phase bridge circuit.
A method for building a PT symmetrical wireless power transmission circuit comprises the following steps:
the method comprises the following steps that firstly, a wireless circuit topological structure of any one of claims 1-4 is built, and PT symmetrical conditions are obtained according to the wireless circuit topological structure and a coupling mode equation;
secondly, calculating each parameter on the wireless circuit topological structure according to the PT symmetrical condition obtained in the first step, wherein the parameter comprises a first capacitor C1A second capacitor C2And a primary side series resistance RfA value of (d);
thirdly, selecting elements to build a wireless power transmission circuit according to the parameter values obtained in the second step;
and fourthly, verifying whether the built circuit transmission power is constant.
Preferably, in the first step, the PT symmetry condition has a mathematical expression of
Preferably, in the second step, by
Calculating a first capacitance C1And a second capacitor C2A value of (b), wherein C1＝C2。
Preferably, in the second step, the front stage series resistance RfCalculated by the following formula: rf≈0.436Requal
Wherein R isequalIs a secondary side AC equivalent resistor, and
compared with the prior art, the invention has the beneficial effects that:
according to the PT symmetrical wireless power transmission circuit, the novel wireless power transmission circuit structure is provided, the two resonant inductors in the resonant unit are coupled, and the coupling between the two resonant inductors ensures that the circuit has PT symmetry within a certain distance; when the PT of the circuit is symmetrical, the whole system has high-speed frequency dynamic regulation capacity, the resonance state of the circuit is ensured, the output voltage is stable and unchanged, and meanwhile, high-efficiency wireless power transmission is kept.
The invention provides a method for constructing a PT symmetrical wireless power transmission circuit, which comprises the steps of firstly constructing the wireless power transmission circuit with a coupling resonance unit, obtaining PT symmetrical conditions of the circuit according to the circuit and a coupling mode equation, calculating all parameters according to the PT symmetrical conditions, and finally selecting elements to construct the wireless power transmission circuit; the PT symmetry of the circuit ensures that when the transmission distance is suddenly changed, the system can automatically adjust the frequency, so that the system works at a corresponding splitting frequency point and the transmission power is constant; meanwhile, the whole system has high-speed frequency dynamic regulation capacity, the resonance state of the circuit is ensured, the output voltage is stable and unchanged, and meanwhile, high-efficiency wireless power transmission is kept.
Drawings
FIG. 1 is a diagram of a wireless circuit topology as contemplated by the present invention;
FIG. 2 is a wireless circuit topology structure diagram constructed by the present invention;
FIG. 3 is a basic waveform diagram of a wireless circuit constructed in accordance with the present invention;
FIG. 4 is a graph of load voltage versus coupling coefficient for the present invention;
FIG. 5 is a graph of the transient waveform of the present invention as the coil distance changes;
figure 6 is a graph of the coil resonance splitting frequency of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The wireless power transmission circuit with symmetric PT provided by the invention has the advantages that the PT symmetry is met under the condition of stronger coupling, and the stable working frequency point of the circuit is a split frequency point when the PT is symmetrical, so that the aim of constant transmission power is fulfilled.
A design method of a PT symmetrical wireless power transmission circuit comprises the following steps:
firstly, setting a wireless circuit topology structure shown in fig. 1, and obtaining conditions of PT symmetry according to the circuit topology structure and a coupling mode equation, specifically:
as shown in fig. 1, the wireless power transmission circuit includes a resonance unit, a load terminal and an inverter circuit, wherein the load terminal is connected in parallel with a secondary side of the resonance unit, and the inverter circuit is connected with a primary side of the resonance unit.
Wherein the resonance unit comprises a first resonance inductor L1A second resonant inductor L2A first capacitor C1And a second capacitor C2Wherein the first resonant inductor L1And a first capacitor C1Connected to form a parallel circuit; a first capacitor C1Is connected with a primary side series resistor RfOne end of (1), the primary side series resistance RfThe other end of the voltage-stabilizing circuit is connected with the output end of the inverter circuit;
second resonant inductor L2And a secondCapacitor C2Connected to form a parallel circuit, a second capacitor C2Is connected with a load impedance RLOne terminal of (1), load impedance RLThe other end of which is connected to the load end.
A phase-locked loop is arranged between the inverter circuit and the resonance unit, wherein two input terminals of the phase-locked loop and the first capacitor C on the primary side1Connected at both ends for synchronizing the first capacitor C1A resonant voltage across; one end of a synchronous signal output by the phase-locked loop is connected with a single-phase bridge type driving circuit module in the inverter circuit, and two pairs of signals with opposite polarities are output, so that four switches of the single-phase bridge type driving circuit are turned on or off in pairs, the whole circuit becomes a self-resonant circuit, and a single chip microcomputer or other control chips are not needed.
At the same time, the first resonant inductor L1And a second resonant circuit L2The minimum coupling coefficient between the two is kmin。
Secondly, calculating all parameters on the wireless power transmission circuit by combining the wireless power transmission circuit established in the first step according to PT symmetrical conditions, wherein the parameters comprise a first resonant inductor L1A second resonant inductor L2A first capacitor C1A second capacitor C2And a primary side series resistance RfA value of (d);
thirdly, selecting an element building circuit according to the calculated resistance, capacitance and inductance value of each passive element according to the obtained parameters, and simultaneously neglecting the delay of the phase-locked loop and the control circuit to carry out simulation;
and fourthly, verifying whether the built circuit transmission power is constant.
Specifically, the method comprises the following steps:
in the first step, the specific method for obtaining the symmetric condition of PT by combining the circuit topological structure with the coupling mode equation is as follows:
firstly, according to the circuit topology structure, obtaining a known parameter voltage UinOutput voltage UoutOutput power PoutAnd a coil resonance frequency f, establishing a coupling mode equation according to the known parameters:
wherein a is1、a2Representative is the coupling modulus phasor, which is defined as,
simplifying the already established coupled mode equations,
wherein
As can be derived from the above equation,
[j(ω1-ωs)+g]·[j(ω2-ωs)-γL]+κ21κ12＝0
by separating the real and imaginary parts of the above equation, we can know the value at ω1＝ω2＝ω0Time, circuit operating frequency omegasIn the strongly coupled region (kappa ≧ gamma)L) And weakly coupled regions (kappa < gamma)L) All have solutions, specifically:
in the strongly coupled region, the possible operating frequency is
Operating at whichever splitting frequency, there are
The selection of frequencies is shown in fig. 6.
In the weak coupling region, the only operating frequency is ωs＝ω0The actual gain at this time is
Therefore, the circuit has the function of frequency selection, so that the power transmission can be constant in a strong coupling area, which is determined by the property of the system and can be explained by a mathematical model, namely a coupling mode equation.
Secondly, calculating the conditions required to be met by PT symmetry according to the established coupling mode equation, namely the conditions of a strong coupling area:
according to the minimum coupling coefficient kminThe PT symmetry conditions are found as follows:
and is
C2＝C1
Wherein the minimum coupling coefficient kminCalculating according to the given maximum constant power transmission distance; rLIs the load impedance, whose value is known and determined by the circuit topology.
In the second step, according to the PT symmetrical condition, the specific method for calculating each parameter on the wireless power transmission circuit by combining the wireless power transmission circuit established in the first step is as follows:
wherein the resonant coil has been wound, and the first resonant inductor L1And a second resonant inductor L2All are fixed values and can be measured by an instrument;
a first capacitor C1And a second capacitor C2Is given a value of
Calculating by ten;
bars corresponding to maximum efficiency for constant power with PT symmetryThe element obtains the preceding series resistance R by the following formulaf：
Rf≈0.436Requal
Wherein R isequalIs a secondary side AC equivalent resistor, and
thirdly, selecting an element building circuit according to the calculated resistance, capacitance and inductance value of each passive element according to the obtained parameters, and neglecting the delay of the phase-locked loop and the control circuit to simulate;
according to the system block diagram of fig. 1 and the above theoretical calculation, a simulation circuit diagram as shown in fig. 2 and fig. 3 can be constructed, wherein fig. 2 specifically shows the inverter circuit of fig. 1 as a single-phase bridge circuit.
Fourthly, verifying whether the built circuit transmission power is constant or not
After the circuit is completely built, the accuracy and reliability of the model are verified, design parameters are calculated in the simulation circuit according to the theory, and whether the voltage on two sides of the coil is unchanged under the condition of strong coupling is observed.
It can be seen that in the case of strong coupling, the circuit has PT symmetry, i.e. when
k＞kmin
Is provided with
U1≈U2
Namely, constant power transmission can be achieved in the strong coupling region; the effect is shown in figure 4.
Examples
The invention provides a design method of a PT symmetrical wireless power transmission circuit, which comprises the following steps:
the method comprises the following steps of establishing a circuit topological structure, wherein system parameters of the circuit structure comprise:
input DC voltage U of 25Vdc(ii) a Output power P of 50Wout(ii) a First capacitance C of 22nF1And a second capacitor C2(ii) a First resonant inductance L of 6.26nH1And the second resonanceInductor L2(ii) a 4 omega front stage series resistance RF(ii) a Load impedance R of 8 omegaL(ii) a Resonant voltage U of 22.17V1，U2(ii) a Coil resonance frequency omega1，ω2Split frequencies, respectively, as shown in the split frequency plot 6; filter capacitor C of 1uFout(ii) a 1uH filter inductor Lout(ii) a A coupling coefficient k of 0 to 0.3; a coil quality factor Q of 300; wherein
RlIs the parasitic resistance of the coil.
Obtaining PT symmetry conditions according to the above parameters in combination with the coupled mode equation, i.e.
Second, calculating a first capacitance C according to PT symmetry conditions1A second capacitor C2And a preceding stage series resistance RF：
Wherein, according to the requirement of the actual transmission distance, the value at the maximum constant power transmission distance, namely the minimum coupling coefficient is taken as,
kmin＝0.067
then
Front stage series impedance RfIn order to realize the purpose,
Rf≈0.436Requal≈4Ω
thirdly, selecting an element to build a circuit;
and fourthly, verifying whether the built circuit transmission power is constant.
According to the embodiment, when the transmission distance is suddenly changed, the system can automatically adjust the frequency, so that the system works at a corresponding splitting frequency point, and the transmission power is constant. Fig. 5 illustrates that the circuit has high-speed dynamic response, namely, the frequency adjustment can be completed within tens of microseconds, and the property is derived from the PT symmetry of the circuit, which is different from the traditional complex algorithm frequency adjustment measure.
Based on the final simulation result, constant power wireless power transmission within a certain distance can be realized, system parameters can be corrected and adjusted according to the result, repeated debugging is carried out, and the establishment of a system platform is carried out after an ideal model is obtained. By the mode, the efficiency can be greatly improved at the source, and a large amount of financial resources, energy and material resources are not consumed, so that the method is one of approaches for solving the problem of adjusting the transmission power of the wireless electric energy.
Claims (6)
1. A PT symmetrical wireless power transmission circuit is characterized by comprising a resonance unit, a load end and an inverter circuit, wherein the load end is connected with the secondary side of the resonance unit in parallel, the inverter circuit is connected with the primary side of the resonance unit, and the inverter circuit is connected with the secondary side of the resonance unit,
the resonant unit comprises a first resonant inductor L1A second resonant inductor L2A first capacitor C1And a second capacitor C2Wherein the first resonant inductor L1And a first capacitor C1Connected to form a parallel circuit; a first capacitor C1Is connected with a primary side series resistor RfOne end of (1), the primary side series resistance RfThe other end of the voltage-stabilizing circuit is connected with the output end of the inverter circuit;
second resonant inductor L2And a second capacitor C2Connected to form a parallel circuit, a second capacitor C2Is connected with a load impedance RLOne terminal of (1), load impedance RLThe other end of the first end is connected with a load end;
the wireless power transmission circuit has PT symmetry condition, i.e.
Wherein k isminIs the minimum coupling coefficient between the first resonant inductor L1 and the second resonant circuit L2.
2. The PT symmetric wireless power transmission circuit of claim 1, wherein a phase locked loop is disposed between the inverter circuit and the resonant unit.
3. The PT symmetrical wireless power transmission circuit of claim 1, wherein the inverter circuit is a single-phase bridge circuit.
4. A method for building a PT symmetrical wireless power transmission circuit is characterized by comprising the following steps:
the method comprises the following steps that firstly, a wireless circuit topological structure of any one of claims 1-3 is built, and PT symmetrical conditions are obtained according to the wireless circuit topological structure and a coupling mode equation;
secondly, calculating each parameter on the wireless circuit topological structure according to the PT symmetrical condition obtained in the first step, wherein the parameter comprises a first capacitor C1A second capacitor C2And a primary side series resistance RfA value of (d);
thirdly, selecting elements to build a wireless power transmission circuit according to the parameter values obtained in the second step;
fourthly, verifying whether the built circuit transmission power is constant or not;
the wireless power transmission circuit has PT symmetry condition, i.e.
Wherein k isminIs the minimum coupling coefficient between the first resonant inductor L1 and the second resonant circuit L2.
5. The method of claim 4, wherein the second step is performed by
Calculating a first capacitance C1And a second capacitor C2A value of (b), wherein C1＝C2。
6. The method of claim 4, wherein in the second step, the pre-stage series resistor R is connected to the power linefCalculated by the following formula: rf≈0.436Requal
Wherein R isequalIs a secondary side AC equivalent resistor, and
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| CN109693560B (en) * | 2019-01-28 | 2024-08-16 | 华南理工大学 | Electric automobile wireless charging system with constant current characteristic based on PT symmetry principle |
| CN110022005B (en) * | 2019-04-19 | 2024-02-06 | 华南理工大学 | Constant-power dynamic wireless power transmission system for mobile load |
| CN110401440A (en) * | 2019-08-26 | 2019-11-01 | 范瑞兆 | A kind of piezoelectric ceramic transformer based on phaselocked loop |
| CN113054759B (en) * | 2021-03-31 | 2023-06-20 | 维沃移动通信有限公司 | Wireless power receiving device, wireless charging system and electronic equipment |
| CN113507300B (en) * | 2021-06-21 | 2022-06-14 | 华南理工大学 | Wireless energy-carrying communication system based on autonomous circuit principle |
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