CN105958664B - One kind being based on the matched radio energy transmission system power efficiency optimization method of maximum power - Google Patents
One kind being based on the matched radio energy transmission system power efficiency optimization method of maximum power Download PDFInfo
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- CN105958664B CN105958664B CN201610375637.8A CN201610375637A CN105958664B CN 105958664 B CN105958664 B CN 105958664B CN 201610375637 A CN201610375637 A CN 201610375637A CN 105958664 B CN105958664 B CN 105958664B
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Abstract
The invention discloses one kind being based on the matched radio energy transmission system power efficiency optimization method of maximum power, has the combined optimization of the power and efficiency in the case where realizing radio energy transmission system power matching state.For medium transmission range is required and emitting side and all immutable radio energy transmission system of receiving side parameter, this method realizes system and is accessing the efficient point generated when a certain fixed size load corresponding to multiple mesh power points and mesh power point；Secondly according to loading demand, the operating point of suitable power and efficient point as system is chosen in generated multiple mesh power points and its corresponding efficient point.This law meets the needs of load is for power, and is optimized on this basis to efficiency and power.
Description
Technical field
The present invention relates to a kind of methods of radio energy transmission system power efficiency optimization, and distance is wireless suitable for meter level
Electric energy transmits, while not changing transmitting terminal and the radio energy transmission system of receiving terminal parameter.
Background technology
Middle apart from wireless power transmission technological layer, how to optimize bearing power and efficiency of transmission always is that one is ground
The hot issue studied carefully.Currently, in order to realize the electric energy wireless transmission in long range occasion relatively high power and greater efficiency, first,
The resonant frequency of system is usually relatively high, up to the MHz of several MHz~tens；Second, design size larger resonance coil changes
Kind transmission performance；Third, optimization system parameter is to realize the impedance matching of system.But under higher resonant frequency, high frequency
Power supply is difficult to realize the output of relatively high power, while excessively high resonant frequency not only reduces the stable region degree of system, and right
It is also especially high in the requirement of device.By design large-size resonance coil method under the limited occasion of transmission space nothing
Method application.About the optimization for realizing bearing power and system effectiveness by impedance matching, then that studies is more, but is limited to sending out
It penetrates side or receiving side controls and optimizes.Emitting side and receiving side be all restricted and it is inconvenient change when, these methods just lack
The possibility of application is lost.
Invention content
Goal of the invention：In order to overcome the shortcomings of that existing scheme, the present invention propose a kind of based on the matched nothing of maximum power
Line electric energy transmission system power efficiency optimization method.
Technical solution：One kind being based on the matched radio energy transmission system power efficiency optimization method of maximum power, described
Radio energy transmission system includes the transmitting coil, repeating coil and receiving coil that coil radius is r and coaxial arrangement, hair
The distance between ray circle and receiving coil are d02, and meet d02=(10~12) r；The transmitting coil and receiving coil
The number of turns is N, and the number of turns of the repeating coil is 2N, the effective turn of the repeating coil access compensating electric capacity loop 1~
It is adjustable within the scope of 2N, the distance between the repeating coil and transmitting coil d01It is adjustable；Described method includes following steps：
1), for a certain fixed load RL, 0.1r is set as the unit displacement distance of repeating coil, changes junction line successively
The position of circle dynamically changes the effective turn of the repeating coil access compensating electric capacity loop on each position and adjusts compensation
Capacitance is consistent to system resonance frequencies, if the bearing power emergent power peak point of the receiving coil, by the power peak
Value point is set as mesh power point and the efficiency of transmission of measurement at this time；In repeating coil and transmitting coil distance d01And repeating coil
With receiving coil distance d12It is all higher than in the range of 2r, obtains the mesh power point set being made of several mesh power points
And the efficiency point set being made of the efficient point corresponding to mesh power point；
2), from mesh power point set and corresponding efficiency point set, selection meets load power demand and has highest
Operating point of the point of efficiency as radio energy transmission system；
3) compensating electric capacity ring is accessed in the position and the repeating coil for, adjusting repeating coil according to the operating point of selection
The effective turn on road realizes the optimization of system-power efficiency.
2. a kind of radio energy transmission system power efficiency optimization method according to claim 1, it is characterised in that：
Further include the calibration steps to the power peak point in the step 1)：
A), for any power peak point, mended according to the position of corresponding repeating coil and repeating coil access
The mutual inductance M of repeating coil and transmitting coil is calculated in the effective turn for repaying capacitance loop01, transmitting coil and receiving coil
Mutual inductance M02, repeating coil and receiving coil mutual inductance M12；
B), according to the M01、M02、M12Reflected umpedance R of the transmitting coil on repeating coil is calculatedref0→1, relaying
Transmitting impedance R of the coil on receiving coilref1→2, reflected umpedance R of the transmitting coil on receiving coilref0→2And relaying
The impedance loss coefficient Γ of coil0→1：
Wherein, rsFor the internal resistance of the high frequency electric source of connection transmitting coil, r0For the internal resistance of transmitting coil, r1For repeating coil
Internal resistance, r2For the internal resistance of receiving coil；ω is radio energy transmission system resonance angular frequency；
C), by the Rref0→1、Rref1→2、Rref0→2And Γ0→1It substitutes into following formula, judges whether formula is true：
If the formula is invalid, the corresponding mesh power point of the power peak point and efficient point are deleted from set
It removes.
Advantageous effect：One kind of the present invention being based on maximum power matched radio energy transmission system power efficiency optimization side
Method passes through for medium transmission range is required and emitting side and all immutable radio energy transmission system of receiving side parameter
The method for adjusting the distance between repeating coil and transmitting coil and change repeating coil the number of turns, change its with transmitting coil and its
Mutual inductance relationships between receiving coil with realize it is same be supported on repeating coil with different the number of turns and different location when multiple spot
Power match.This method realizes system and generates multiple mesh power points and matching work(when accessing a certain fixed size load
Efficient point corresponding to rate point；Secondly according to loading demand, in generated multiple mesh power points and its corresponding efficient point
The middle operating point for choosing suitable power and efficient point as system, it is right under the premise of loading the demand for power to disclosure satisfy that
Efficiency and power optimize.
Description of the drawings
Fig. 1 is the radio energy transmission system structure chart with repeating coil；
Fig. 2 is the radio energy transmission system equivalent circuit diagram with repeating coil；
Fig. 3 is the distribution map of the power match point of different loads；
Fig. 4 is the optimal power and efficient point of a certain fixed load.
Specific implementation mode
Further explanation is done to the present invention below in conjunction with the accompanying drawings.
As shown in Figure 1, it is a kind of based in the matched radio energy transmission system power efficiency optimization method of maximum power, it is somebody's turn to do
Radio energy transmission system includes the transmitting coil, repeating coil and receiving coil that coil radius is r and coaxial arrangement, hair
The distance between ray circle and receiving coil are d02, and meet d02=(10~12) r.The primary compensating electric capacity of transmitting coil series connection
After connect high frequency electric source, repeating coil is connected adjustable relaying compensating electric capacity, is used for after receiving coil series connection secondary compensation capacitance
Connection load.The number of turns of transmitting coil and receiving coil is N, and the number of turns of repeating coil is 2N, repeating coil access compensation electricity
The effective turn for holding loop is adjustable within the scope of 1~2N, the distance between repeating coil and transmitting coil d01It is adjustable.Such as Fig. 2 institutes
It is shown as the equivalent circuit diagram of the radio energy transmission system, UsFor high frequency electric source, rsFor the internal resistance of source, L0, L1, L2Respectively emit
The self-induction of coil, repeating coil, receiving coil, M01、M12、M02Respectively transmitting coil and repeating coil, repeating coil and reception
Mutual inductance between coil, transmitting coil and receiving coil, r0、r1And r2Respectively transmitting coil, repeating coil and receiving coil
Internal resistance, C0、C1And C2The respectively resonance compensation capacitance of radiating circuit, repeat circuit and receiving circuit.RLIt is connect by receiving coil
Load.The frequency of high frequency electric source and the resonant frequency of resonance mechanism are consistent, i.e. f=1/ (2 π sqrt (L0 C0))=1/ (2
πsqrt(L1 C1))=1/ (2 π sqrt (L2 C2))。
This method includes the following steps：
1), for a certain fixed load RL, 0.1r is set as the unit displacement distance of repeating coil, changes junction line successively
The position of circle dynamically changes the effective turn of the repeating coil access compensating electric capacity loop on each position and adjusts compensation
Capacitance is consistent to system resonance frequencies, if the bearing power emergent power peak point of receiving coil, by the power peak point
It is set as mesh power point and the efficiency of transmission of measurement at this time.In repeating coil and transmitting coil distance d01And repeating coil with connect
The distance d of take-up circle12Be all higher than in the range of 2r, obtain the mesh power point set being made of several mesh power points and
The efficiency point set being made of the efficient point corresponding to mesh power point.
Further include the calibration steps to each power peak point in mesh power point set in step 1), specially：
A), for any power peak point, according to the position of corresponding repeating coil and repeating coil access compensation electricity
The effective turn for holding loop, is calculated the mutual inductance M of repeating coil and transmitting coil01, transmitting coil and receiving coil mutual inductance
M02, repeating coil and receiving coil mutual inductance M12。
B), according to M01、M02、M12Reflected umpedance R of the transmitting coil on repeating coil is calculatedref0→1, repeating coil
Transmitting impedance R on receiving coilref1→2, reflected umpedance R of the transmitting coil on receiving coilref0→2And repeating coil
Impedance loss coefficient Γ0→1：
Wherein, rsFor the internal resistance of the high frequency electric source of connection transmitting coil, r0For the internal resistance of transmitting coil, r1For repeating coil
Internal resistance, r2For the internal resistance of receiving coil；ω is radio energy transmission system resonance angular frequency.
C), by Rref0→1、Rref1→2、Rref0→2And Γ0→1It substitutes into following formula, judges whether formula is true：
If the formula is invalid, the corresponding mesh power point of the power peak point and efficient point are deleted from set
It removes.It judges that principle is, bearing power PoutWith load RLResistance value is related, to radio energy transmission system bearing power PoutAsk one
Order derivative and to enable reciprocal value be zero to obtain above formula, that is, could realize power match when meeting above formula.
2), from mesh power point set and corresponding efficiency point set, selection meets load power demand and has highest
Operating point of the point of efficiency as radio energy transmission system.
3) compensating electric capacity ring is accessed in the position and the repeating coil for, adjusting repeating coil according to the operating point of selection
The effective turn on road realizes the optimization of system-power efficiency.
To keep present embodiment apparent, with RLNominal value be respectively to illustrate this reality for 5 Ω, 10 Ω and 15 Ω
Apply mode.
The deviation of setting load value first is limited to 10%, i.e., with nominal value RLFor=5 Ω, ranging from the 4.5 of load value
The Ω of Ω~5.5.According to above-mentioned embodiment, when the number of turns of repeating coil is from 1 circle to the variable range of 36 circles, transmitting coil and
The distance d of repeating coil01When variable from 0.36m~0.62m, the distribution map of power match point as shown in Figure 3 is obtained, it is corresponding
In the load that nominal value is 5 Ω, shares 23 points and meet；Corresponding to the load that nominal value is 10 Ω, shares 15 points and meet.Often
One point both corresponds to a system effectiveness when mesh power and load acquisition mesh power.Further, with load
RLNominal value be respectively 5 Ω and 10 Ω for, 3 mesh powers obtained and corresponding efficiency draw load work(with reference to the accompanying drawings
Rate and system effectiveness figure, such as attached drawing 4.Under conditions of mesh power, according to maximum transmitted theorem, system effectiveness certainly less than
50%；At this point, according to curve, selects to meet load power demand first and have the operating point of peak efficiency as the optimal of system
Operating point.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (2)
1. one kind being based on the matched radio energy transmission system power efficiency optimization method of maximum power, it is characterised in that：It is described
Radio energy transmission system includes the transmitting coil, repeating coil and receiving coil that coil radius is r and coaxial arrangement, hair
The distance between ray circle and receiving coil are d02, and meet d02=(10~12) r；The transmitting coil and receiving coil
The number of turns is N, and the number of turns of the repeating coil is 2N, the effective turn of the repeating coil access compensating electric capacity loop 1~
It is adjustable within the scope of 2N, the distance between the repeating coil and transmitting coil d01It is adjustable；Described method includes following steps：
1), for a certain fixed load RL, 0.1r is set as the unit displacement distance of repeating coil, changes repeating coil successively
Position dynamically changes the effective turn of the repeating coil access compensating electric capacity loop on each position and adjusts compensating electric capacity
It is consistent to system resonance frequencies, if the bearing power emergent power peak point of the receiving coil, by the power peak point
It is set as mesh power point and the efficiency of transmission of measurement at this time；In repeating coil and transmitting coil distance d01And repeating coil with connect
The distance d of take-up circle12Be all higher than in the range of 2r, obtain the mesh power point set being made of several mesh power points and
The efficiency point set being made of the efficient point corresponding to mesh power point；
2), from mesh power point set and corresponding efficiency point set, selection meets load power demand and has peak efficiency
Operating point of the point as radio energy transmission system；
3) compensating electric capacity loop is accessed in the position and the repeating coil for, adjusting repeating coil according to the operating point of selection
Effective turn realizes the optimization of system-power efficiency.
2. a kind of radio energy transmission system power efficiency optimization method according to claim 1, it is characterised in that：It is described
Further include the calibration steps to the power peak point in step 1)：
A), for any power peak point, according to the position of corresponding repeating coil and repeating coil access compensation electricity
The effective turn for holding loop, is calculated the mutual inductance M of repeating coil and transmitting coil01, transmitting coil and receiving coil mutual inductance
M02, repeating coil and receiving coil mutual inductance M12；
B), according to the M01、M02、M12Transmitting impedance R of the transmitting coil on repeating coil is calculatedref0→1, repeating coil
Transmitting impedance R on receiving coilref1→2, transmitting impedance R of the transmitting coil on receiving coilref0→2And repeating coil
Impedance loss coefficient Γ0→1：
Wherein, rsFor the internal resistance of the high frequency electric source of connection transmitting coil, r0For the internal resistance of transmitting coil, r1For in repeating coil
Resistance, r2For the internal resistance of receiving coil；ω is radio energy transmission system resonance angular frequency；
C), by the Rref0→1、Rref1→2、Rref0→2And Γ0→1It substitutes into following formula, judges whether formula is true：
If the formula is invalid, the corresponding mesh power point of the power peak point and efficient point are deleted from set.
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| CN106410987B (en) * | 2016-12-05 | 2019-03-29 | 青岛鲁渝能源科技有限公司 | Control method when radio energy transmission system and its load switching |
| CN109728654A (en) * | 2018-09-29 | 2019-05-07 | 深圳市华禹无线供电技术有限公司 | Three-winding structure wireless electric energy Transmission system |
| CN109510328B (en) * | 2018-11-27 | 2022-06-28 | 南京理工大学 | Reconfigurable wireless power transmission system with self-adaptive offset |
| CN109638977B (en) * | 2019-01-25 | 2022-09-20 | 南京理工大学 | Stereoscopic space multi-node power balancing wireless power supply system and method |
| CN111740506B (en) * | 2020-07-06 | 2022-02-08 | 浙江大学 | Design method of three-coil wireless power transmission system with stable voltage gain |
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| CN103986243A (en) * | 2014-02-27 | 2014-08-13 | 清华大学 | Optimization design method of magnetic coupling resonant type wireless electric power transmission system |
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| CN104167828A (en) * | 2014-07-23 | 2014-11-26 | 南昌大学 | Design method for multi-repeater magnetic-coupling resonant wireless power transmission system |
| CN105391190A (en) * | 2015-11-17 | 2016-03-09 | 东南大学 | Double-source wireless power supply system spacing optimization method based on minimum power fluctuation standard deviation |
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