CN106410987B - Control method when radio energy transmission system and its load switching - Google Patents
Control method when radio energy transmission system and its load switching Download PDFInfo
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Abstract
The present invention proposes control method when a kind of radio energy transmission system and its load switching, receiving end MCU acquires the output voltage of receiving end current rectifying and wave filtering circuit in real time in the invention, the amplitude real-time judge changed by output voltage loads the direction for whether switching and switching, and the working frequency of regulating system accordingly fast frequency-hopped arrives new resonant operational frequency, system is set to quickly recover to new resonant state, to inhibit the mutation of rectified voltage, to be rapidly achieved the stable state again of system.The present invention can effectively prevent wireless receiving end from leading to the excessive fluctuating of rectified voltage because loading variation, improve the stability of radio energy transmission system work.
Description
Technical field
The invention belongs to load switching control in wireless power transmission field more particularly to a kind of radio energy transmission system
Method.
Background technique
In recent years, wireless charging technology is quickly grown, because its is non-contact, without electric wire connection, the characteristics such as easy to operate, by
Concern, various wireless charging products are also come out one after another.As the maturation of its wireless charging technology is more next with application field
More extensive, the promotion of power and better user experience are more and more important.
Existing wireless charging system, sees on the whole, including two parts: radio energy transmitting terminal and radio energy receive
End, and radio energy transmitting terminal and radio energy receiving end transmit energy by magnetic field, do not run wires between the two, nothing
Line electric energy transmitting terminal will obtain radio energy receiving-end state information and carry out the adjusting of energy transmission, must just pass from receiving end
It send control signal to carry out control after parsing again to transmitting terminal and forms a control loop, the transmission of signal is then by wireless communication
System is to complete.
And in wireless charging technical controlling field, from underloading to the switching of heavy duty, there is changed power is more big more can not
The problem of handover success, the reason is that: radio energy transmission system needs work in resonant state, could obtain highest
System effectiveness, and the load of receiving end also assists in the resonance of whole system in the form of reflected umpedance.When load changes,
It is equivalent to the resonant state for the system of destroying, system is in temporary detuning state, and receiving end cannot obtain enough from magnetic field
Energy, fall so as to cause the output voltage after the filtering high-frequency rectifier of receiving end.Due to radio energy transmission system
Receiving end is passive system, and the components such as MCU of the operation of control system are powered by the electric energy obtained in electromagnetic field.Such as
The output voltage of fruit receiving end falls too excesssive words, and receiving terminal system can be made to be in short time power down state when serious, from
And make system work in uncontrollable abnormality.Similarly, when load switches from heavy duty to underloading, also due to system is temporary
It is detuning, and output voltage is excessively high after causing receiving end to rectify, and is very easy to burn the voltage regulator circuit of rear class, or improve rear class
The input voltage stress of circuit.In summary, the receiving end of radio energy transmission system is that energy is obtained from electromagnetic field, is not
One stable constant-current source or constant pressure source, it is easy to the variations such as be loaded and generate dramatic impact.And in traditional power-supply system
It is acquisition electric energy (usually stable constant pressure source) from power grid, when occurring to switch between weight load, power supply output
The usual very little of variation.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of radio energy transmission system and its load switching control sides
Method, the invention can effectively prevent the excessive fluctuating of wireless receiving end rectified voltage, improve radio energy transmission system work
The stability of work.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of radio energy transmission system, wireless transmitting terminals and receivable wireless transmitting terminals including being connected to power grid
The wireless receiving end of electric energy, wireless transmitting terminals include the transmitting coil and receivable communication signal that can transmit radio energy
Wireless communication receiver module；Connect load outside wireless receiving end, emits the receiving coil of electric energy in transmitting coil including can receive, with
And receiving coil can be exported electric energy and be converted into the wireless communication transmitting module that communication signal is transmitted to communication receipt module, wirelessly
Transmitting terminal further includes transmitting terminal current rectifying and wave filtering circuit, and the output end of transmitting terminal current rectifying and wave filtering circuit is parallel with inverter circuit and linear
Voltage-stablizer, transmitting coil connect the output end of inverter circuit；The output end and wireless communication of transmitting terminal MCU connection linear voltage regulator
The output end of receiving module, transmitting terminal MCU are electrically connected the control terminal of inverter circuit, to control the high-frequency ac converted in inverter circuit
Electric frequency；The receiving coil at wireless receiving end is connected with receiving end current rectifying and wave filtering circuit, the output of receiving end current rectifying and wave filtering circuit
End connection DC/DC translation circuit, DC/DC translation circuit connect output voltage sampling circuit, to acquire receiving end rectification filter in real time
The output end of output voltage after wave circuit rectification, output voltage sampling circuit connects receiving end MCU, receiving end MCU connection nothing
Line communicates transmitting module, and the digital data transmission after converting to wireless communication transmitting module forms communication signal；Wherein, it connects
Receiving end MCU acquires the output voltage of receiving end current rectifying and wave filtering circuit in real time, and according to the switching of collection voltages value computational load after
System resonance frequencies, by the frequency, transmitting module and wireless communication receiver module are sent to transmitting terminal MCU by wireless communication,
Transmitting terminal MCU is according to the starting working frequency for judging signal adjustment wireless transmitting terminals, thus electricity after inhibiting wireless receiving end to rectify
The fluctuation of pressure, to maintain the stabilization of radio energy transmission system.
Control method when switching is loaded in a kind of radio energy transmission system, comprising the following steps: S1: starting radio
It can Transmission system；S2: transmitting coil emits electric energy, and receiving coil receives electric energy, and rectifies by receiving end current rectifying and wave filtering circuit
It is exported after filtering；S3: output voltage sampling circuit acquires the voltage after rectifying and wave-filtering in real time, and by the voltage input to receiving end
MCU；S4: receiving end MCU receives the voltage signal in output voltage sampling circuit, and compares the change of voltage magnitude in the unit time
Whether change value is in default mutational range:
Such as in default mutational range, then step S2 is repeated；
If in default mutational range, receiving end MCU is not preceding according to the variation of the voltage signal computational load of acquisition and becomes
System resonance frequencies after change, and transmitting module and wireless communication receiver module are sent by wireless communication by frequency after the variation
Into transmitting terminal MCU, transmitting terminal MCU adjusts new starting output frequency according to the signal and controls signal, and executes step S2, directly
The changing value of voltage magnitude is in default mutational range in the receiving end MCU unit time.
Advanced optimized as of the invention, the step of above-mentioned S4 in, receiving end MCU compares voltage magnitude in the unit time
Changing value not in default mutational range when, if voltage magnitude quickly falls in the unit time, then receiving end MCU determines negative
When carrying the system resonance frequencies by underloading change heavy duty, after the variation of receiving end MCU computational load and being sent in transmitting terminal MCU, hair
The output frequency control signal control inverter circuit for penetrating end MCU exports new starting working frequency.
Advanced optimized as of the invention, the step of above-mentioned S4 in, receiving end MCU compares voltage magnitude in the unit time
Changing value not in default mutational range when, if voltage magnitude quickly increases in the unit time, then receiving end MCU determines negative
Carry and lightened loads by heavy duty, receiving end MCU computational load change after resonance frequency and when being sent in transmitting terminal MCU, transmitting terminal
The output frequency control signal control inverter circuit of MCU exports new starting working frequency.
Compared with prior art, the advantages and positive effects of the present invention are:
Control method when radio energy transmission system of the invention and its load switching, it is real-time by receiving end MCU
The output voltage of receiving end current rectifying and wave filtering circuit is acquired, and by the comparison of output voltage amplitude of variation in the unit time, in turn
Judge whether load changes, is further transmitted to wireless transmitting terminals, wireless transmitting terminals calculate new system according to the signal
Near resonance frequency and quickly the starting working frequency to new system resonance frequencies of adjustment system, to effectively inhibit whole
The big ups and downs of voltage after stream are rapidly achieved the stable state again of system.
Detailed description of the invention
Fig. 1 is the schematic diagram of radio energy transmission system of the present invention；
Fig. 2 is the flow chart of load switching period control method in radio energy transmission system of the present invention.
Specific embodiment
In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one
In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments
In.
It is the schematic diagram of radio energy transmission system of the present invention referring to Fig. 1, as shown in Figure 1, radio energy of the invention passes
Defeated system, it is wireless to send out including being connected to the wireless transmitting terminals of power grid and the wireless receiving end of receivable wireless transmitting terminals electric energy
Penetrating end includes the wireless communication receiver module that can transmit the transmitting coil and receivable communication signal of radio energy；Wirelessly connect
Connect load outside receiving end, emit the receiving coil of electric energy in transmitting coil including can receive, and receiving coil can be exported electric energy
It is converted into the wireless communication transmitting module that communication signal is transmitted to communication receipt module, wireless transmitting terminals further include transmitting terminal rectification
Filter circuit, the output end of transmitting terminal current rectifying and wave filtering circuit are parallel with inverter circuit and linear voltage regulator, and transmitting coil connection is inverse
The output end on power transformation road；The output end of transmitting terminal MCU connection linear voltage regulator and the output end of wireless communication receiver module, transmitting
End MCU is electrically connected the control terminal of inverter circuit, to control the high-frequency ac electric frequency converted in inverter circuit；Wireless receiving end connects
Take-up circle is connected with receiving end current rectifying and wave filtering circuit, and the output end of receiving end current rectifying and wave filtering circuit connects DC/DC translation circuit,
DC/DC translation circuit connects output voltage sampling circuit, to acquire the output electricity after the rectification of receiving end current rectifying and wave filtering circuit in real time
Pressure, the output end of output voltage sampling circuit connect receiving end MCU, and MCU connection in receiving end wirelessly communicates transmitting module, will turn
Digital data transmission to wireless communication transmitting module after changing forms communication signal；Wherein, receiving end MCU acquires receiving end in real time
Whether the output voltage of current rectifying and wave filtering circuit, the amplitude real-time judge load changed by output voltage mutate, and according to
System resonance frequencies after the switching of collection voltages value computational load, by the frequency transmitting module and channel radio by wireless communication
Letter receiving module is sent to transmitting terminal MCU, and transmitting terminal MCU adjusts the output of wireless transmitting terminals according to the calculated value of receiving end MCU
New starting adjusts frequency, to inhibit the drop range of wireless receiving end rectified voltage, to maintain radio energy transmission system
Stable state.
Among the above, it further illustrates, receiving end MCU is specifically included can output voltage in real-time reception current rectifying and wave filtering circuit
Analog signal can be switched to the AD analog-to-digital conversion module of digital signal by acquisition module, can remove noise signal in collection voltages
Whether filter module can store the memory module of acquisition signal, voltage magnitude variation can be mutated in the real-time judge unit time
Comparison module prestores the computing module of working frequency calculation formula, and can generate control according to signal is generated in comparison module
The control module of signal wherein presets mutational range value in comparison module, voltage magnitude variation is default prominent with this in the unit time
Become value range to compare, such as in the mutational range, then the radio energy system continues to existing frequency operation；Such as beyond mutation
Range then forms jump signal, the computing module that working frequency can be calculated according to collection voltages is prestored in computing module, further
Working frequency after the calculating is sent to transmitting terminal MCU, transmitting terminal MCU control system is according to the working frequency control after the calculating
Inverter circuit jumps to new starting working frequency in wireless transmitting terminals processed, until comparing in comparison module in the MCU of receiving end
It was found that voltage magnitude variation is preset in mutational range value at this in the unit time.
In addition, being connected with driving circuit between transmitting terminal MCU and inverter circuit, the control formed in control module is believed
Number inverter circuit is controlled by driving circuit.
It referring to fig. 2, is the flow diagram that control method when switching is loaded in radio energy transmission system of the present invention.Such as
Control method when switching, including following step are loaded shown in Fig. 2, in a kind of radio energy transmission system provided in the present invention
It is rapid:
S1: starting radio energy transmission system；
S2: transmitting coil emits electric energy, and receiving coil receives electric energy, and by receiving end current rectifying and wave filtering circuit rectifying and wave-filtering
After export；
S3: output voltage sampling circuit acquires the voltage after rectifying and wave-filtering in real time, and by the voltage input to receiving end
MCU；
S4: receiving end MCU receives the voltage signal in output voltage sampling circuit, and compares voltage magnitude in the unit time
Changing value whether in default mutational range:
Such as in default mutational range, then step S2 is repeated；
If in default mutational range, receiving end MCU is not preceding according to the variation of the voltage signal computational load of acquisition and becomes
System resonance frequencies after change, and transmitting module and wireless communication receiver module are sent by wireless communication by frequency after the variation
Into transmitting terminal MCU, transmitting terminal MCU exports new initial frequency according to signal adjustment and controls signal, and executes step S2, directly
The changing value of voltage magnitude is in default mutational range in the receiving end MCU unit time.
In addition, receiving end MCU compares the changing value of voltage magnitude in the unit time not default in the above-mentioned S4 the step of
When in mutational range, if voltage magnitude quickly falls in the unit time, then receiving end MCU determines that load becomes heavy duty by underloading,
System resonance frequencies after the variation of receiving end MCU computational load and when being sent in transmitting terminal MCU, the output frequency of transmitting terminal MCU
Rate controls signal and controls inverter circuit output frequency to new starting working frequency.
In the above-mentioned S4 the step of, receiving end MCU compares the changing value of voltage magnitude in the unit time not in default mutation
When in range, such as voltage magnitude rapid increase in the unit time, then receiving end MCU determines that load is lightened loads by heavy duty, reception
Working frequency after the MCU computational load variation of end and when being sent in transmitting terminal MCU, the output frequency of transmitting terminal MCU controls letter
Number control inverter circuit output frequency is to new starting working frequency.
Above-mentioned control method is further described, when changing because of the load of system, needs to keep radio energy
Transmission system always works in the frequency near resonance frequency, just can guarantee export enough power and higher system in this way
Efficiency.In the present invention, can be calculated according to following method before load switching with the working frequency of system after switching (with
For transmitting terminal and receiving end are all the SS type compensation topology of series compensation, and system work is in perceptual area), and the calculating is public
Formula is the calculation formula prestored in the MCU of receiving end, specific as follows:
Receiving terminal circuit equivalent impedance are as follows:
Reflected umpedance of the receiving terminal circuit to transmitting terminal are as follows:
The then total impedance of radio energy transmission system are as follows:
ω when the imaginary part of total impedance Zt is zero is then the resonant frequency point of radio energy transmission system.I.e.
Im[Zt]=0
Simultaneous can solve the resonance frequency of system.
Assuming that the job initiation frequency of load before handover is FL, the initial frequency after load switching is FH, FLAnd FH
The resonance frequency of radio energy transmission system can be specifically determined by above-mentioned formula.
In load handoff procedure, since radio energy transmission system is in temporary detuning state, the rectification of receiving end
Output voltage appearance is quickly fallen after filtering.For this purpose, the present invention uses the frequency hopping control based on load variation, quickly by system
Working frequency be adjusted to system operating frequency corresponding under heavy duty or light condition, thus the resonance shape of quick recovery system
State.
In order to which system can be aware of when to be loaded from underloading to heavy duty or heavy duty in real time to the switching of underloading, this hair
The output voltage sampling circuit of bright middle setting, can after the rectifying and wave-filtering of real-time monitoring receiving end the variation of output voltage method.
The output voltage of receiving end corresponds to working frequency point FLOr FHNeighbouring corresponding Vrect, when load variation does not occur, usually
Vrect only fluctuates (for example fluctuation range △ Vrect is less than 5V) in very small range.If radio energy transmission system detects
To the fluctuation of Vrect considerably beyond normal fluctuation range △ Vrect, as the short time changes to N times of △ Vrect, (N usually may be used
To be taken as 3-4 times), at this time it is considered that the switching that radio energy transmission system is loaded.At this moment receiving end MCU can root
It is (corresponding heavily loaded to underloading if Vrect is got higher according to the direction of variation；If Vrect is lower, corresponding underloading is cut to heavy duty
Change), transmitting and receiving module by wireless communication notify the transmitting terminal of radio energy transmission system by the working frequency of system
It is switched to corresponding FLOr FH, so that radio energy transmission system be allowed to rapidly enter a new stable resonant state.
For the above method, it is described in further detail below:
After system electrification, receiving end MCU is acquired in real time and is handled the voltage of current rectifying and wave filtering circuit output, while passing through comparison
Voltage magnitude changing value and default mutational range value in unit time, further judge whether load changes；When appearance
Weight carries the moment of switching, and receiving end MCU passes through according to the system resonance frequencies after the variation of the voltage value computational load of acquisition
It wirelessly communicates transmitting module and carries out the frequency signal to data by wireless telecommunications receiving module and wireless telecommunications receiving module
The operation that data deciphering, format parsing, checksum validation and data are extracted, to take out control signal；Wireless transmitting terminals MCU connects
After receiving the signal, inverter circuit output frequency is further controlled, to adjust the starting working frequency of radio energy transmission system,
When voltage magnitude changing value is with default mutational range value within the comparison unit time by receiving end MCU, voltage magnitude variation
Value then continues stable operation in default mutational range value.
The present invention acquires the output voltage of receiving end current rectifying and wave filtering circuit by receiving end MCU in real time, and when passing through unit
The comparison of interior output voltage, and then judge whether load changes, it further calculates the new resonance frequency of system and passes through
Communication module is transmitted to wireless transmitting terminals, and wireless transmitting terminals adjust new starting working frequency according to the signal, thus effectively
The big ups and downs for inhibiting rectified voltage are rapidly achieved the stable state again of system.
Claims (4)
1. a kind of radio energy transmission system, wireless transmitting terminals and receivable wireless transmitting terminals electricity including being connected to power grid
The wireless receiving end of energy, wireless transmitting terminals include that can transmit the nothing of the transmitting coil and receivable communication signal of radio energy
Line communication receipt module；Connect load outside wireless receiving end, emits the receiving coil of electric energy in transmitting coil including can receive, and
Receiving coil electric energy be can be exported and the wireless communication transmitting module that communication signal is transmitted to communication receipt module, feature are converted into
It is:
Wireless transmitting terminals further include transmitting terminal current rectifying and wave filtering circuit, and the output end of transmitting terminal current rectifying and wave filtering circuit is parallel with inversion electricity
Road and linear voltage regulator, transmitting coil connect the output end of inverter circuit；The output end of transmitting terminal MCU connection linear voltage regulator and
The output end of wireless communication receiver module, transmitting terminal MCU are electrically connected the control terminal of inverter circuit, are converted with controlling in inverter circuit
High-frequency ac electric frequency；The receiving coil at wireless receiving end is connected with receiving end current rectifying and wave filtering circuit, receiving end rectifying and wave-filtering
The output end of circuit connects DC/DC translation circuit, and DC/DC translation circuit connects output voltage sampling circuit, is connect with real-time acquisition
The output end of output voltage after the rectification of receiving end current rectifying and wave filtering circuit, output voltage sampling circuit connects receiving end MCU, receiving end
MCU connection wirelessly communicates transmitting module, and the digital data transmission after converting to wireless communication transmitting module forms communication letter
Number；
Wherein, receiving end MCU acquires the output voltage of receiving end current rectifying and wave filtering circuit in real time, the amplitude changed by output voltage
Real-time judge load whether mutate, and according to collection voltages value computational load switching after system resonance frequencies operating point,
With by the frequency, transmitting module and wireless communication receiver module are sent to transmitting terminal MCU by wireless communication, transmitting terminal MCU according to
The initial frequency of the calculated value adjustment system of receiving end MCU, so that the quick of output voltage falls after inhibiting wireless receiving end to rectify
It falls or rises, to maintain the stable state of radio energy transmission system.
2. loading control method when switching in a kind of radio energy transmission system, it is characterised in that: the following steps are included:
S1: starting radio energy transmission system；
S2: transmitting coil emits electric energy, and receiving coil receives electric energy, and defeated after the current rectifying and wave filtering circuit rectifying and wave-filtering of receiving end
Out；
S3: output voltage sampling circuit acquires the voltage after rectifying and wave-filtering in real time, and by the voltage input to receiving end MCU；
S4: receiving end MCU receives the voltage signal in output voltage sampling circuit, and compares the change of voltage magnitude in the unit time
Whether change value is in default mutational range:
Such as in default mutational range, then step S2 is repeated；
If not in default mutational range, receiving end MCU is according to before the variation of the voltage signal computational load of acquisition and after variation
Resonance frequency, and transmitting module and wireless communication receiver module are sent to transmitting by wireless communication by the frequency after the variation
It holds in MCU, transmitting terminal MCU controls signal according to the frequency signal adjustment working frequency after variation, and frequently by work adjusted
Rate controls initial frequency of the signal as system, and executes step S2, up to the change of voltage magnitude in the receiving end MCU unit time
Change value is in default mutational range.
3. control method when switching is loaded in radio energy transmission system according to claim 2, it is characterised in that: above-mentioned
In the step of S4, when receiving end MCU compares the changing value of voltage magnitude in the unit time not in default mutational range, such as the list
Voltage magnitude quickly falls in the time of position, then receiving end MCU determines that load becomes heavy duty by underloading, and receiving end MCU computational load becomes
System resonance frequencies after change and when being sent in transmitting terminal MCU, the working frequency control signal control inversion electricity of transmitting terminal MCU
Road exports new starting working frequency.
4. control method when switching is loaded in radio energy transmission system according to claim 2, it is characterised in that: above-mentioned
In the step of S4, when receiving end MCU compares the changing value of voltage magnitude in the unit time not in default mutational range, such as the list
Voltage magnitude rapid increase in the time of position, then receiving end MCU determines that load is lightened loads by heavy duty, the change of receiving end MCU computational load
System resonance frequencies after change and when being sent in transmitting terminal MCU, the working frequency control signal control inversion electricity of transmitting terminal MCU
Road exports new starting working frequency.
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| CN107565710B (en) * | 2017-09-08 | 2020-09-25 | 哈尔滨工程大学 | Magnetic coupling resonance type wireless power supply system capable of automatically adjusting to optimal working frequency |
| CN109698559A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Split cooking apparatus and its wireless power supply system and wireless power control method |
| CN108110912B (en) * | 2018-02-07 | 2023-12-01 | 天津工业大学 | Wireless power transmission device with identity recognition and resonance decoupling functions |
| CN108667155A (en) * | 2018-06-08 | 2018-10-16 | 深圳森阳环保材料科技有限公司 | A kind of radio energy transmission system and control method |
| CN110401266B (en) * | 2019-07-29 | 2021-02-12 | 歌尔股份有限公司 | Wireless charging receiving end circuit and electronic equipment with wireless charging function |
| CN112165181A (en) * | 2020-09-16 | 2021-01-01 | 郑州轻工业大学 | Frequency self-adaptive adjustment wireless electric energy transmission system and method |
| CN112234802B (en) * | 2020-09-23 | 2022-05-24 | 上海誉腾电源设备有限公司 | Resonance frequency control method and system of HFDC high-frequency power supply |
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| CN105958664A (en) * | 2016-05-30 | 2016-09-21 | 东南大学 | Power efficiency optimization method for wireless electric energy transmission system based on maximum power matching |
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| US9531441B2 (en) * | 2012-02-21 | 2016-12-27 | Lg Innotek Co., Ltd. | Wireless power receiver and method of managing power thereof |
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| WO2013042570A1 (en) * | 2011-09-22 | 2013-03-28 | Ｎｅｃトーキン株式会社 | Power transmitting device, power receiving device, non-contact power transmission system, and method for controlling transmission power in non-contact power transmission system |
| CN104124765A (en) * | 2013-04-28 | 2014-10-29 | 海尔集团技术研发中心 | Power adjustment method of wireless power transmission system and system thereof |
| CN105720701A (en) * | 2016-01-28 | 2016-06-29 | 北京理工大学 | Inductive coupling type wireless energy transmission system and active disturbance rejection control method thereof |
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