CN105322662A - Wireless energy transmission system resonant frequency control method and device - Google Patents
Wireless energy transmission system resonant frequency control method and device Download PDFInfo
- Publication number
- CN105322662A CN105322662A CN201410319498.8A CN201410319498A CN105322662A CN 105322662 A CN105322662 A CN 105322662A CN 201410319498 A CN201410319498 A CN 201410319498A CN 105322662 A CN105322662 A CN 105322662A
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- frequency
- power supply
- excitation power
- output current
- launching circuit
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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
Abstract
A wireless energy transmission system resonant frequency control method comprises detecting an output voltage and an output current of an excitation power supply connected to an emission loop; enabling working frequency of the excitation power supply and inherent frequency of the emission loop to scan and change in a first frequency region and a second frequency region respectively; recording the magnitude and frequency of each output current detected when the output voltage and the output current are in the same phase in the scanning process; selecting the frequency of the minimum output current of the recorded output current; and enabling the working frequency of the excitation power supply and inherent frequency of the emission loop to be same with the frequency of the minimum output current. The method only takes control measures at the transmitting terminal of the system, and the working frequency of the excitation power supply and the inherent frequency of the emission loop are allowed to scan and change, and the inherent frequency of a reception loop is tracked dynamically, so that the whole system is allowed to be in a resonance working state.
Description
Technical field
The present invention relates to wireless energy transmission technology field, particularly a kind of resonance frequency control method of wireless energy transfer system and the device for wireless energy transfer.
Background technology
Various power consumption equipment uses wired connection to realize the transmission of energy usually.Wireless transmission due to energy has use safety and feature easily, and the wireless transmission realizing energy is the dream that people thirst for realizing always.In the application places that some are special, wire maybe can not be used to provide the occasion of energy as underwater operation, medical embedded equipment, wireless network etc. are inconvenient, realize wireless energy transfer and there is higher using value.
According to Energy Transfer principle, at present, studied at home and abroad wireless energy transmission technology mainly contains electromagnetic wave energy transmission technology, inductive coupling type wireless energy transmission technology and resonance type wireless energy transmission technology.
Electromagnetic wave energy transmission technology is the principle utilizing antenna to send and receive, microwave is such as used to carry out wireless energy transfer, this technology can realize high through-put power, the subject matter that this technology exists to have barrier to block in energy transmission path, and namely Energy Transfer cannot be walked around or pass barrier.
Inductive coupling type wireless energy transmission technology utilizes electromagnetic induction principle, adopts loosely coupled transformer or detachable transformer to realize contactless power delivery.The subject matter of this kind of technology existence is that Energy Transfer distance is subject to the limitation of transmission principle and is limited in a millimeter grade.
Resonance type wireless electric energy transmission technology is a kind of energy transmission technology making launching circuit separated by a distance and receiving loop all be in resonance condition, and it is adapted at the transmission that moderate distance realizes wireless energy.Because launching circuit and receiving loop are easily subject to various interference in the operational environment of reality, make whole system be difficult to work in resonance condition, and the off resonance of system sharply decline by making the efficiency of transmission of system.
Summary of the invention
The object of the invention is to, in wireless energy transfer system, can automatically adjust or control system resonance frequency and make whole system work in resonance condition.
In order to realize object of the present invention, a first aspect of the present invention is the resonance frequency control method that will provide a kind of wireless energy transfer system, described wireless energy transfer system utilizes the coupling of electromagnetic field from being positioned at the launching circuit of transmitting terminal to the receiving loop transmitting energy being positioned at receiving terminal, it is characterized in that, described resonance frequency control method comprises, and detects the output voltage and the output current that are access in the excitation power supply of launching circuit; The natural frequency of the operating frequency of excitation power supply and launching circuit is changed in first frequency region and second frequency sector scanning respectively, wherein, first frequency region and second frequency region all comprise the 3rd frequency field residing for natural frequency of receiving loop, and the operating frequency of excitation power supply and the natural frequency of launching circuit scan first frequency region and second frequency region at least one time respectively; Be recorded in size and frequency that the output voltage of excitation power supply in scanning process and output current are in each output current of the excitation power supply detected by same phase time; Select the frequency of the minimum output current in each recorded output current; Make the operating frequency of excitation power supply all identical with the frequency of this minimum output current with the natural frequency of launching circuit again.
In the application system of reality, the circuit parameter of launching circuit and receiving loop all will be subject to the impact of environment and change, the natural frequency of launching circuit and receiving loop all will be changed, in fact, the natural frequency of launching circuit and the natural frequency of receiving loop all may change in respective a certain frequency field, such as, the natural frequency of receiving loop may change in the 3rd described frequency field, therefore, in the operational environment of reality, the off resonance of launching circuit and receiving loop is easy to occur.
Resonance frequency control method of the present invention, only take control measure at the transmitting terminal of system, make the natural frequency of the operating frequency of excitation power supply and launching circuit all scan variations also dynamic natural frequencys of following the tracks of receiving loop, thus make whole system be in resonant operational state.
And existing technology needs all to take control measure at transmitting terminal and receiving terminal usually, whole system just can be made to be in resonant operational state; And in the application such as such as medical embedded equipment, take control measure to be very difficult at the receiving terminal of system, or even impossible; Therefore, resonance frequency control method of the present invention only takes control measure just can realize the resonant operational of system at the transmitting terminal of system, and this is an important breakthrough technically and has very high using value.
Because the frequency of the output current of excitation power supply is identical with the operating frequency of excitation power supply, so the frequency of the output current of excitation power supply i.e. the operating frequency of excitation power supply.
Scanning first frequency region refers to that the other end being scanned up to first frequency region from the one end in first frequency region terminates scanning like this one time for one time; Equally, scan second frequency region and refer to that the other end being scanned up to second frequency region from the one end in second frequency region terminates scanning like this one time for one time.
In described resonance frequency control method, first frequency region can be greater than second frequency region, and first frequency region can equal second frequency region, and first frequency region also can be less than second frequency region.
In one preferred embodiment, first frequency region comprises second frequency region.Preferably implement in execution mode at another, second frequency region comprises first frequency region.
In described resonance frequency control method, the natural frequency of described launching circuit in second frequency region with certain stepping-in amount scan variations, and the natural frequency of described launching circuit every scan variations stepping-in amount, the operating frequency of described excitation power supply just scans first frequency region one time.
Every scan variations described here stepping-in amount refers to often to be increased or reduces by a stepping-in amount.If stepping-in amount is 100 hertz, a stepping-in amount just represents 100 hertz, and natural frequency every scan variations stepping-in amount refers to that natural frequency often increases or reduces 100 hertz.
In described resonance frequency control method, the operating frequency of described excitation power supply in first frequency region with certain stepping-in amount scan variations, and the operating frequency of described excitation power supply every scan variations stepping-in amount, the natural frequency of described launching circuit just scans second frequency region one time.
In described resonance frequency control method, the natural frequency scan variations of launching circuit can be made by the parameter of the resonant element controlling launching circuit.Preferably, the natural frequency scan variations of launching circuit is made by the size of the resonant capacitance controlling launching circuit.
In described resonance frequency control method, the 3rd frequency field residing for the natural frequency of receiving loop presets usually, and verify set accuracy by experiment, usually require that the 3rd frequency field is as far as possible little, but require that the natural frequency of receiving loop can only change in the 3rd frequency field.
A second aspect of the present invention to provide a kind of device for wireless energy transfer, described device utilizes the coupling of electromagnetic field to transmit energy from the launching circuit being positioned at transmitting terminal to the receiving loop being positioned at receiving terminal, it is characterized in that, described device comprises, capacitance matrix, as the resonant element of launching circuit, testing circuit, for detecting output voltage and the output current of the excitation power supply being access in launching circuit, relay system, for control capacitance matrix to make the natural frequency energy scan variations of launching circuit, oscillator, for controlling the operating frequency of excitation power supply, single chip control unit, described single chip control unit is configured to, the frequency of oscillation that can control oscillator makes the operating frequency scan variations of excitation power supply, energy control relay system makes the natural frequency scan variations of launching circuit, the output voltage of excitation power supply and output current can be recorded in the size of each output current of the excitation power supply detected by phase time testing circuit and frequency, the frequency of the minimum output current in each recorded output current can be selected, can also control oscillator makes the operating frequency of excitation power supply all identical with the frequency of this minimum output current with the natural frequency of launching circuit with relay system, wherein, the operating frequency of excitation power supply and the natural frequency of launching circuit are respectively in first frequency region and the change of second frequency sector scanning, and first frequency region and second frequency region all comprise the 3rd frequency field residing for natural frequency of receiving loop.
Device of the present invention, only arranges control device at the transmitting terminal of system, just can make the natural frequency of the operating frequency of excitation power supply and launching circuit all scan variations also dynamic natural frequencys of following the tracks of receiving loop, just can realize the resonant operational of whole system.And existing technology needs all to arrange control device at the transmitting terminal of system and the receiving terminal of system usually, just whole system resonant operational can be made.Therefore, device of the present invention has significant progress technically.
In the device, first frequency region can be greater than second frequency region, and first frequency region can equal second frequency region, and first frequency region also can be less than second frequency region.
In a preferred embodiment, first frequency region comprises second frequency region.In another preferred embodiment, second frequency region comprises first frequency region.
Preferably, the natural frequency of described launching circuit in second frequency region with certain stepping-in amount scan variations, and the natural frequency of described launching circuit every scan variations stepping-in amount, the operating frequency of described excitation power supply just scanning first frequency region one time.
Preferably, the operating frequency of described excitation power supply in first frequency region with certain stepping-in amount scan variations, and the operating frequency of described excitation power supply every scan variations stepping-in amount, the natural frequency of described launching circuit just scanning second frequency region one time.
In described wireless energy transform device, the natural frequency scan variations of launching circuit can be made by the parameter changing capacitance matrix.
Accompanying drawing explanation
Figure l is the structural representation of the device for wireless energy transfer of the present invention.
Fig. 2 be shown in Fig. 1 for the operating frequency of excitation power supply in the device of wireless energy transfer, relation schematic diagram between the natural frequency of launching circuit and the natural frequency of receiving loop.
Fig. 3 is the control flow schematic diagram of the resonance frequency control method of wireless energy transfer system.
Fig. 4 is the control flow of another embodiment of the resonance frequency control method of wireless energy transfer system.
Embodiment
Figure l is the structural representation of the device for wireless energy transfer of the present invention, and it is made up of transmitting terminal and receiving terminal.In FIG, transmitting terminal comprises by excitation power supply
, transmitting coil
, launch electric capacity
and capacitance matrix
the launching circuit formed and the control circuit formed primarily of single chip control unit, relay system and testing circuit.Wherein, excitation power supply
comprise DC power supply
, by field effect transistor
with
the half bridge circuit formed, drive circuit and oscillator.Receiving terminal comprises by receiving coil
, receive electric capacity
and load
the receiving loop formed.
In FIG, testing circuit detects the output voltage of excitation power supply respectively
and output current
, be then sent to A/D converter and carry out analog-to-digital conversion, be finally sent in Micro-processor MCV.The control signal that Micro-processor MCV sends controls oscillator respectively by I/O interface and relay system carries out associative operation.With reference to figure 2, single chip control unit controls oscillator and relay system, makes the operating frequency of excitation power supply
in the change of first frequency sector scanning, make the natural frequency of launching circuit
in the change of second frequency sector scanning, wherein, the natural frequency of receiving loop
be in the 3rd frequency field, first frequency region and second frequency region all comprise the 3rd frequency field.
In FIG, if the electric current flowing through launching circuit and receiving loop is respectively
,
, transmitting coil
with receiving coil
between mutual inductance and distance be respectively
,
, excitation power supply
internal resistance be
, transmitting coil
with receiving coil
resistance be respectively
,
, wherein, the electric current of launching circuit
be exactly the output current of excitation power supply, application Kirchhoff's second law, can obtain following formula:
（1）
Can be able to be solved by (1) formula:
（2）
In formula:
（3）
（4）
（5）
As can be seen from (2) formula, the output voltage of excitation power supply
with the electric current of launching circuit
be in same phase time, have
, at this moment (2) formula can be changed into
（6）
As can be seen from (4) formula and (6) formula, resistance
size and angular frequency
closely related, at the output voltage of excitation power supply
with the electric current of launching circuit
when being in homophase, if
obtain maximum, at this moment
obtain minimum value.
Order
, can obtain
when obtaining maximum,
should following formula be met:
（7）
In formula
for the quality factor of receiving loop, it meets following formula:
（8）
Due in the application system of reality, quality factor
usually much larger than 1, at this moment (7) formula can be changed into:
（9）
Above formula illustrates that at this moment receiving loop will be in resonance condition.(9) formula is substituted into (5) formula and applies relation
, can obtain:
（10）
Above formula illustrates that at this moment launching circuit is also in resonance condition.
Therefore, at height
in the application system of value, at the output voltage of excitation power supply
with the output current of excitation power supply
when being in homophase,
when obtaining minimum value, launching circuit and receiving loop are in resonance condition substantially.Resonance frequency control technology of the present invention that Here it is only carries out the theoretical foundation controlled at transmitting terminal.
Fig. 2 shows the operating frequency of the excitation power supply of the present embodiment
, launching circuit natural frequency
with the natural frequency of receiving loop
correlation between three.Can be clear that in fig. 2, the operating frequency of excitation power supply
sweep limits exist
extremely
between, the natural frequency of launching circuit
sweep limits exist
extremely
between, the natural frequency of receiving loop
can be
extremely
between change, wherein,
with
sweep limits all include
the whole frequency range that may change.
In the present embodiment, the natural frequency of launching circuit
be 100 hertz of scan variations in second frequency region with stepping-in amount, and the natural frequency of launching circuit often change 100 hertz, the operating frequency of excitation power supply
just one time, scanning first frequency region.If the natural frequency of launching circuit
from frequency
be scanned up to frequency
need stepping N time, namely change N number of 100 hertz, so the operating frequency of excitation power supply
just need to scan first frequency region N+1 time, like this when the natural frequency of launching circuit
from frequency
be scanned up to frequency
, excitation power supply operating frequency
when having scanned first frequency region N+1 time, the output voltage of excitation power supply and output current just have and are in cophasal state N+1 time, if be recorded in size and frequency that the output voltage of excitation power supply in this scanning process and output current are in N+1 output current of the excitation power supply detected by same phase time, and select the frequency of the minimum output current in recorded a N+1 output current, then control the operating frequency that oscillator and relay system make excitation power supply
with the natural frequency of launching circuit
all identical with the frequency of this minimum output current, such whole system will be in resonance condition.
Fig. 3 is the control flow schematic diagram of the resonance frequency control method of wireless energy transfer system of the present invention.Can see in figure 3, this resonance frequency control method comprises: detect the output voltage being access in the excitation power supply of launching circuit
and output current
; Make the operating frequency of excitation power supply
with the natural frequency of launching circuit
respectively in first frequency region and the change of second frequency sector scanning, and make the operating frequency of excitation power supply
with the natural frequency of launching circuit
scan first frequency region and second frequency region at least one time respectively, wherein, first frequency region and second frequency region all comprise the natural frequency of receiving loop
the 3rd residing frequency field; Be recorded in the output voltage of excitation power supply in scanning process
and output current
be in size and the frequency of each output current of the excitation power supply detected by same phase time; Select the frequency of the minimum output current in each recorded output current
; Make the operating frequency of excitation power supply again
with the natural frequency of launching circuit
all with the frequency of this minimum output current
identical.
Fig. 4 shows the control flow of another execution mode of the resonance frequency control method of wireless energy transfer system.In this embodiment, resonant frequency control method comprises: system initialization, is parameter
,
,
,
Assignment respectively
,
, 0,0,Wherein
,
Be respectively the low-limit frequency in first frequency region and second frequency region; Control the operating frequency that oscillator makes excitation power supply
Work in the low-limit frequency in first frequency region
, the capacitance matrix that controls launching circuit makes the intrinsic frequency of its launching circuit
Work in the low-limit frequency in second frequency region
;Detect the excitation power supply that is access in launching circuit
Output voltage
And output current
; To parameter
Whether be greater than 0 to judge, to output voltage
And output current
Whether homophase judges; When the intrinsic frequency of launching circuit works in the low-limit frequency in second frequency region,The operating frequency of excitation power supply
With stepping-in amount
From the low-limit frequency in first frequency region
Be scanned up to the highest frequency in first frequency region
, intrinsic frequency
Every increase stepping-in amount
,The operating frequency of excitation power supply
With stepping-in amount
One time, scanning first frequency region, when the intrinsic frequency of launching circuit is scanned up to the highest frequency in second frequency region
And the operating frequency of excitation power supply is also scanned up to the highest frequency in first frequency region
After, its scanning temporarily stops, and is recorded in output voltage in above-mentioned scanning process
And output current
Be in size and the frequency of each output current of same phase time;Select the minimum current in each recorded output current
Frequency
; Make again the operating frequency of excitation power supply and the intrinsic frequency of launching circuit all with minimum current
Frequency
Identical, and to parameter
Increase by 1, so that follow-up control.In this embodiment, also comprise in resonance frequency control method, empty size and the frequency of each recorded output current, to save memory space; Whether the side-play amount of output current detected in operation is greater than with the ratio of former output current
judge, parameter here
can set as required, such as
can be set to
if Rule of judgment is false, system is with the frequency operation of originally selected minimum current, if Rule of judgment is set up, to again select the frequency of new minimum current according to foregoing process, and make the operating frequency of excitation power supply identical with the frequency of new minimum current with the natural frequency of launching circuit.
Although shown and described and thought preferred embodiments of the invention at present, obviously, those skilled in the art can carry out various changes and improvements.And these change or improve, and all belong to the scope of the present invention that appended claims limits.
Claims (6)
1. the resonance frequency control method of a wireless energy transfer system, described wireless energy transfer system utilizes the coupling of electromagnetic field from being positioned at the launching circuit of transmitting terminal to the receiving loop transmitting energy being positioned at receiving terminal, it is characterized in that, described resonance frequency control method comprises, and detects the output voltage and the output current that are access in the excitation power supply of launching circuit; The natural frequency of the operating frequency of excitation power supply and launching circuit is changed in first frequency region and second frequency sector scanning respectively, wherein, first frequency region and second frequency region all comprise the 3rd frequency field residing for natural frequency of receiving loop, and the operating frequency of excitation power supply and the natural frequency of launching circuit scan first frequency region and second frequency region at least one time respectively; Be recorded in size and frequency that the output voltage of excitation power supply in scanning process and output current are in each output current of the excitation power supply detected by same phase time; Select the frequency of the minimum output current in each recorded output current; Make the operating frequency of excitation power supply all identical with the frequency of this minimum output current with the natural frequency of launching circuit again.
2. resonance frequency control method as claimed in claim 1, it is characterized in that, described first frequency region comprises described second frequency region.
3. resonance frequency control method as claimed in claim 1, it is characterized in that, described second frequency region comprises described first frequency region.
4. resonance frequency control method as claimed in claim 1, it is characterized in that, the natural frequency of described launching circuit in second frequency region with certain stepping-in amount scan variations, and the natural frequency of described launching circuit every scan variations stepping-in amount, the operating frequency of described excitation power supply just scans first frequency region one time.
5. resonance frequency control method as claimed in claim 1, it is characterized in that, the operating frequency of described excitation power supply in first frequency region with certain stepping-in amount scan variations, and the operating frequency of described excitation power supply every scan variations stepping-in amount, the natural frequency of described launching circuit just scans second frequency region one time.
6. resonance frequency control method as claimed in claim 1, it is characterized in that, described resonance frequency control method also comprises, and is made the natural frequency scan variations of launching circuit by the parameter of the resonant element controlling launching circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710598757.9A CN107342635B (en) | 2014-07-07 | 2014-07-07 | The resonance frequency control method of wireless energy transfer system |
| CN201410319498.8A CN105322662B (en) | 2014-07-07 | 2014-07-07 | The resonant frequency control method and device of wireless energy transfer system |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201410319498.8A CN105322662B (en) | 2014-07-07 | 2014-07-07 | The resonant frequency control method and device of wireless energy transfer system |
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| CN201710598757.9A Division CN107342635B (en) | 2014-07-07 | 2014-07-07 | The resonance frequency control method of wireless energy transfer system |
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| CN105322662A true CN105322662A (en) | 2016-02-10 |
| CN105322662B CN105322662B (en) | 2017-09-26 |
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| CN201410319498.8A Expired - Fee Related CN105322662B (en) | 2014-07-07 | 2014-07-07 | The resonant frequency control method and device of wireless energy transfer system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109495117A (en) * | 2018-12-18 | 2019-03-19 | 北京品驰医疗设备有限公司 | Wireless energy transfer transmitting frequency calibration method and device |
| CN109633264A (en) * | 2018-12-13 | 2019-04-16 | 深圳市英威腾电气股份有限公司 | A kind of intermediate frequency power supply seeks frequency method, device and equipment |
| CN109633484A (en) * | 2018-12-13 | 2019-04-16 | 深圳市英威腾电气股份有限公司 | A kind of phase-lock technique of intermediate frequency power supply, device and equipment |
| CN109728655A (en) * | 2019-03-01 | 2019-05-07 | 中国矿业大学(北京) | Variable topological structure magnetic coupling resonant radio energy Transmission system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633264A (en) * | 2018-12-13 | 2019-04-16 | 深圳市英威腾电气股份有限公司 | A kind of intermediate frequency power supply seeks frequency method, device and equipment |
| CN109633484A (en) * | 2018-12-13 | 2019-04-16 | 深圳市英威腾电气股份有限公司 | A kind of phase-lock technique of intermediate frequency power supply, device and equipment |
| CN109633484B (en) * | 2018-12-13 | 2021-06-29 | 深圳市英威腾电气股份有限公司 | Phase locking method, device and equipment of intermediate frequency power supply |
| CN109633264B (en) * | 2018-12-13 | 2021-07-06 | 深圳市英威腾电气股份有限公司 | Frequency searching method, device and equipment of intermediate frequency power supply |
| CN109495117A (en) * | 2018-12-18 | 2019-03-19 | 北京品驰医疗设备有限公司 | Wireless energy transfer transmitting frequency calibration method and device |
| CN109728655A (en) * | 2019-03-01 | 2019-05-07 | 中国矿业大学(北京) | Variable topological structure magnetic coupling resonant radio energy Transmission system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107342635B (en) | 2019-09-06 |
| CN107342635A (en) | 2017-11-10 |
| CN105322662B (en) | 2017-09-26 |
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