CN110086265A - A kind of radio energy transmission system and method for adjustable load output voltage - Google Patents
A kind of radio energy transmission system and method for adjustable load output voltage Download PDFInfo
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- CN110086265A CN110086265A CN201910497564.3A CN201910497564A CN110086265A CN 110086265 A CN110086265 A CN 110086265A CN 201910497564 A CN201910497564 A CN 201910497564A CN 110086265 A CN110086265 A CN 110086265A
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The present invention provides a kind of radio energy transmission system of adjustable load output voltage, including comparator control circuit, transmitting terminal inverter circuit, receiving end rectification circuit and LC-LC series resonant network, the receiving end rectification circuit peripheral hardware reference voltage Vref, the transmitting terminal inverter circuit connect by LC-LC series resonant network with the receiving end rectification circuit, and the LC-LC series resonant network includes the coil L for being connected on transmitting terminal inverter circuit1, resonant capacitance C1With the coil L for being connected on receiving end rectification circuit2, resonant capacitance C2, the coil L2It is connect with the comparator control circuit.The present invention also provides a kind of wireless power transmission methods of adjustable load output voltage.The beneficial effects of the present invention are: adjustable load output voltage.
Description
Technical field
The present invention relates to a kind of radio energy of radio energy transmission system more particularly to adjustable load output voltage biographies
Defeated System and method for.
Background technique
Traditional radio energy transmission system usually only realizes the wireless transmission of electric energy.At rated loads, output voltage
It is unadjustable, systematic difference range generate certain limitation, meanwhile, when light load, due to the variation of output voltage
So that the transimission power of system is decreased obviously, wireless power transmission degradation is unable to satisfy the requirement of system, and general circuit is set
Meter carries out control to primary side switch pipe by wireless communication or achievees the effect that pressure regulation by the adjustment of late-class circuit, these operations
It will lead to the delay of current phase or the reduction of efficiency of transmission.
Therefore, how to provide a kind of radio energy transmission system of adjustable load output voltage is those skilled in the art
Technical problem urgently to be resolved.
Summary of the invention
In order to solve the problems in the prior art, the present invention provides a kind of radio energies of adjustable load output voltage
Transmission system and method adjust load output voltage by controlling and receiving side switching tube.
The present invention provides a kind of radio energy transmission systems of adjustable load output voltage, including comparator control electricity
Road, transmitting terminal inverter circuit, receiving end rectification circuit and LC-LC series resonant network, the receiving end rectification circuit peripheral hardware ginseng
Examine voltage Vref, the transmitting terminal inverter circuit connect by LC-LC series resonant network with the receiving end rectification circuit, institute
Stating LC-LC series resonant network includes the coil L for being connected on transmitting terminal inverter circuit1, resonant capacitance C1It is whole with receiving end is connected on
The coil L of current circuit2, resonant capacitance C2, the coil L2It is connect with the comparator control circuit, by coil L2Both ends
Voltage sampled and divided, as comparator control circuit anode input, with peripheral hardware reference voltage VrefCarry out pair
Than generating the PWM wave of certain duty ratio, cut-offfing for metal-oxide-semiconductor in the rectification circuit of receiving end being driven, to adjust the output electricity of load
Pressure carries out closed loop design to output voltage, voltage output when load change can be made to remain unchanged.
As a further improvement of the present invention, the receiving end rectification circuit is the driving rectification circuit of double inductive drops.
As a further improvement of the present invention, the receiving end rectification circuit includes metal-oxide-semiconductor M1With metal-oxide-semiconductor M2, filter inductance
L3With filter inductance L4And load R, the filter inductance L3One end and the resonant capacitance C2Connection, the filter inductance L3
The other end and the filter inductance L4One end connection, the filter inductance L4The other end and the connection coil L2, described
Metal-oxide-semiconductor M1Drain electrode be connected to the filter inductance L3, resonant capacitance C2Between, the metal-oxide-semiconductor M1Source electrode and the metal-oxide-semiconductor M2
Source electrode connection, the metal-oxide-semiconductor M2Drain electrode be connected to the filter inductance L4, coil L2Between, one end of the load R connects
It is connected to the metal-oxide-semiconductor M1Source electrode and the metal-oxide-semiconductor M2Source electrode between, it is described load R the other end be connected to the filtered electrical
Feel L3, filter inductance L4Between.
As a further improvement of the present invention, the load R is parallel with capacitor C7。
As a further improvement of the present invention, the concatenated coil L2, resonant capacitance C2It is parallel with capacitor C3。
As a further improvement of the present invention, the transmitting terminal inverter circuit includes metal-oxide-semiconductor M3With metal-oxide-semiconductor M4, the MOS
Pipe M3Source electrode and the metal-oxide-semiconductor M4Drain electrode connection, the resonant capacitance C1It is connected to the metal-oxide-semiconductor M3Source electrode with it is described
Metal-oxide-semiconductor M4Drain electrode between, the coil L1It is connected to the metal-oxide-semiconductor M4Source electrode, the metal-oxide-semiconductor M3Drain electrode connect voltage source
Anode, the metal-oxide-semiconductor M4Source electrode connect voltage source negative pole.
The present invention also provides a kind of wireless power transmission methods of adjustable load output voltage, any one of above-mentioned
On the radio energy transmission system of the adjustable load output voltage, following control is carried out: by coil L2Both ends
Voltage is sampled and is divided, and is inputted as the anode of comparator control circuit, with peripheral hardware reference voltage VrefCarry out pair
Than generating the PWM wave of certain duty ratio, driving cut-offfing for metal-oxide-semiconductor in the rectification circuit of receiving end, different reference voltages is corresponding
The metal-oxide-semiconductor different conducting period carries out closed loop design to output voltage, can make load change to adjust the output voltage of load
When voltage output remain unchanged.
As a further improvement of the present invention, reference voltage V is adjustedref, with coil L2The voltage at both ends is made comparisons, and is obtained
The PWM wave of certain duty ratio passes through receiving end rectification circuit to adjust the switch off time of metal-oxide-semiconductor in the rectification circuit of receiving end
The delay of middle metal-oxide-semiconductor turns on and off the working condition for changing circuit, to change the output voltage of load.
As a further improvement of the present invention, closed loop adjusting is carried out to the radio energy transmission system, on the one hand sets institute
The output voltage V neededref-o, compared with load voltage, and PI adjusting is carried out, exports reference value Vref-i, on the other hand, reference value
Vref-iThen with coil L2The voltage at both ends is compared, and obtains the PWM wave of certain duty ratio, is driven in the rectification circuit of receiving end
Metal-oxide-semiconductor is cut-off, to obtain the output voltage values of demand.
As a further improvement of the present invention, the negative terminal of comparator control circuit is given reference voltage Vref, to coil
L2The voltage swing at both ends zooms in and out, and inputs as the anode of the comparator control circuit, by changing reference voltage
VrefChange the output of comparator control circuit, obtains the PWM wave of certain duty ratio, to drive in the rectification circuit of receiving end
Opening and turning off for metal-oxide-semiconductor, then adjusts the output voltage of load, if load output voltage is made to keep stablizing, comparator control
The anode of circuit processed samples load output voltage, adjusts output reference value V by PIref-i, with the coil L after partial pressure2
Both end voltage compares, to adjust the duty ratio of PWM wave, drives the time that metal-oxide-semiconductor is cut-off in the rectification circuit of receiving end, remains negative
Carry the stabilization of output voltage.
The beneficial effects of the present invention are: through the above scheme, circuit is made to realize the adjustable of output voltage at rated loads
The transimission power of system can be improved in section, while the closed loop design of the circuit makes radio energy transmission system in light the case where loading
Under be still able to achieve higher-wattage electric energy transmission, make output voltage stabilization in the fluctuation of load, the radio energy transmission system knot
Structure is simple, designs flexible adjustment, has stronger practicability.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the radio energy transmission system of adjustable load output voltage of the present invention.
Fig. 2 is a kind of open loop voltage regulation schematic diagram of the radio energy transmission system of adjustable load output voltage of the present invention.
Fig. 3 is a kind of open loop voltage regulation schematic diagram of the radio energy transmission system of adjustable load output voltage of the present invention.
Fig. 4 is a kind of loop pressure-stabilizing schematic diagram of the radio energy transmission system of adjustable load output voltage of the present invention.
Fig. 5 is a kind of circuit working waveform figure of the radio energy transmission system of adjustable load output voltage of the present invention.
Fig. 6 is a kind of control principle drawing of the radio energy transmission system of adjustable load output voltage of the present invention.
Specific embodiment
The invention will be further described for explanation and specific embodiment with reference to the accompanying drawing.
As shown in Figures 1 to 6, a kind of radio energy transmission system of adjustable load output voltage, including comparator control
Circuit 400, transmitting terminal inverter circuit 100, receiving end rectification circuit 200 and LC-LC series resonant network 300 processed, the reception
Hold 200 peripheral hardware reference voltage V of rectification circuitref, the transmitting terminal inverter circuit 100 by LC-LC series resonant network 300 with
The receiving end rectification circuit 200 connects, and the LC-LC series resonant network 300 includes being connected on transmitting terminal inverter circuit 100
Coil L1, resonant capacitance C1With the coil L for being connected on receiving end rectification circuit 2002, resonant capacitance C2, using contactless line
Enclose the transmitting terminal as system and receiving end, the coil L2It is connect with the comparator control circuit, by humorous to receiving end
Vibration capacitor is split, and the combination of LC-LC series resonance and double inductive drop type driving circuits is realized, by coil L2Both ends
Voltage sampled and divided, as comparator control circuit 400 anode input, with peripheral hardware reference voltage VrefInto
Row comparison, generates the PWM wave of certain duty ratio, drives cut-offfing for metal-oxide-semiconductor (MOSFET) in the rectification circuit of receiving end, negative to adjust
The output voltage of load carries out closed loop design to output voltage, voltage output when load change can be made to remain unchanged.
As shown in Figures 1 to 6, the receiving end rectification circuit 200 is the driving rectification circuit of double inductive drops.
As shown in Figures 1 to 6, the receiving end rectification circuit 200 includes metal-oxide-semiconductor M1With metal-oxide-semiconductor M2, filter inductance L3With
Filter inductance L4And load R, the filter inductance L3One end and the resonant capacitance C2Connection, the filter inductance L3's
The other end and the filter inductance L4One end connection, the filter inductance L4The other end and the connection coil L2, described
Metal-oxide-semiconductor M1Drain electrode be connected to the filter inductance L3, resonant capacitance C2Between, the metal-oxide-semiconductor M1Source electrode and the metal-oxide-semiconductor M2
Source electrode connection, the metal-oxide-semiconductor M2Drain electrode be connected to the filter inductance L4, coil L2Between, one end of the load R connects
It is connected to the metal-oxide-semiconductor M1Source electrode and the metal-oxide-semiconductor M2Source electrode between, it is described load R the other end be connected to the filtered electrical
Feel L3, filter inductance L4Between.
As shown in Figures 1 to 6, the anode input wires circle L of comparator control circuit 4002Both ends, negative terminal input connect peripheral hardware
Reference voltage Vref, output end meets metal-oxide-semiconductor M respectively1, metal-oxide-semiconductor M2Grid, by receive lateral coil both ends voltage adopt
Sample and partial pressure are inputted as the anode of comparator control circuit 400, with peripheral hardware reference voltage VrefIt compares, generates one
Determine the PWM wave of duty ratio, drives metal-oxide-semiconductor M in receiving end rectification circuit 2001, metal-oxide-semiconductor M2Cut-off, with adjust load output
Voltage.Based on this control, closed loop design is carried out to output voltage, voltage output when load change can be made to remain unchanged.
As shown in Figures 1 to 6, the load R is parallel with capacitor C7。
As shown in Figures 1 to 6, the concatenated coil L2, resonant capacitance C2It is parallel with capacitor C3。
As shown in Figures 1 to 6, the transmitting terminal inverter circuit 100 includes metal-oxide-semiconductor M3With metal-oxide-semiconductor M4, the metal-oxide-semiconductor M3's
Source electrode and the metal-oxide-semiconductor M4Drain electrode connection, the resonant capacitance C1It is connected to the metal-oxide-semiconductor M3Source electrode and the metal-oxide-semiconductor M4
Drain electrode between, the coil L1It is connected to the metal-oxide-semiconductor M4Source electrode, the metal-oxide-semiconductor M3Drain electrode connect voltage source anode, institute
State metal-oxide-semiconductor M4Source electrode connect voltage source negative pole.
As shown in Figures 1 to 6, the present invention also provides a kind of wireless power transmission sides of adjustable load output voltage
Method carries out following control: logical on the radio energy transmission system of described in any item adjustable load output voltages among the above
It crosses to coil L2The voltage at both ends is sampled and is divided, and is inputted as the anode of comparator control circuit 400, with peripheral hardware
Reference voltage VrefIt compares, generates the PWM wave of certain duty ratio, drive cut-offfing for metal-oxide-semiconductor in receiving end rectification circuit 200,
Different reference voltages corresponds to the metal-oxide-semiconductor different conducting period, to adjust the output voltage of load, carries out closed loop to output voltage
Design, can be such that voltage output when load change remains unchanged.
As shown in Figures 1 to 6, reference voltage V is adjustedref, with coil L2The voltage at both ends is made comparisons, and certain duty is obtained
The PWM wave of ratio, so that the switch off time of metal-oxide-semiconductor in receiving end rectification circuit 200 is adjusted, by receiving end rectification circuit 200
The delay of metal-oxide-semiconductor turns on and off the working condition for changing circuit, to change the output voltage of load.
As shown in Figures 1 to 6, closed loop adjusting is carried out to the radio energy transmission system, the output needed on the one hand setting
Voltage Vref-o, compared with load voltage, and PI adjusting is carried out, exports reference value Vref-i, on the other hand, reference value Vref-iThen with
Coil L2The voltage at both ends is compared, and obtains the PWM wave of certain duty ratio, drives metal-oxide-semiconductor in receiving end rectification circuit 200
It cut-offs, to obtain the output voltage values of demand.
As shown in Figures 1 to 6, the negative terminal of comparator control circuit is given reference voltage Vref, to coil L2Both ends
Voltage swing zooms in and out, and inputs as the anode of the comparator control circuit 400, by changing reference voltage VrefCome
The output for changing comparator control circuit 400, obtains the PWM wave of certain duty ratio, to drive in receiving end rectification circuit 200
Opening and turning off for metal-oxide-semiconductor, then adjusts the output voltage of load, if load output voltage is made to keep stablizing, comparator control
The anode of circuit 400 processed samples load output voltage, adjusts output reference value V by PIref-i, with the coil after partial pressure
L2Both end voltage compares, to adjust the duty ratio of PWM wave, drives the time that metal-oxide-semiconductor is cut-off in receiving end rectification circuit 200,
Maintain the stabilization of load output voltage.
Fig. 2 and Fig. 3 is circuit voltage regulation schematic diagram, by adjusting the turn-on time of rectifying part switching tube, realizes that load is defeated
The adjusting of voltage out.
As reception lateral coil L2The voltage at both ends is timing, by following circuit sampling coil voltage, then with partial pressure electricity
Road makes the amplitude of sampled voltage carry out a certain proportion of diminution, and the negative terminal of comparator meets reference voltage Vref-i, positive termination sampling electricity
Pressure compares and obtains the PWM wave of certain duty ratio, drives rectifying part metal-oxide-semiconductor M2Cut-off；Similarly, as coil L2Voltage be negative
When, reversely take coil L2The voltage of two sides makes the amplitude of sampled voltage carry out a certain proportion of diminution, with ginseng with bleeder circuit
Examine voltage Vref-iCompare and obtain the PWM wave of certain duty ratio, then drives metal-oxide-semiconductor M1Cut-off.Reference voltage Vref-iIt is adjustable,
With Vref-iReduction, comparator output PWM wave duty ratio become larger, the turn-on time of MOSFET is longer.If rectifier terminal inputs
Electric current ir2It is positive, in ir2Before commutation, metal-oxide-semiconductor M2Turn-on time length on load output voltage without influence, metal-oxide-semiconductor M2Shutdown
Period afterflow is carried out by its anti-paralleled diode, circuit is in the state of similar synchronous rectification；If ir2It has been commutated that, due to ginseng
Examine voltage Vref-iValue it is lower so that metal-oxide-semiconductor M2Still in the state opened, at this time circuit can to load output voltage into
Row is adjusted.
If make load change, the output voltage of circuit is remained unchanged, then samples load output voltage, with reference voltage
Vref-oIt is compared, the output of comparator is as above-mentioned Vref-i, so that output voltage is reached requirements under PI adjusting.
Voltage regulator control circuit makes it remain steady under different loads by the working hour of change rectification circuit switching tube
Fixed voltage realizes the work of radio energy transmission system high transformation property in varying load.The radio energy transmission system
For workplaces such as middle low power transmission, output voltage stability maintenances, have a very important significance.
A kind of radio energy transmission system of adjustable load output voltage provided by the invention, double inductive drops are driving
Rectification circuit contains two filter inductances, to be applied to the rectification circuit in LC-LC series resonant network, to receiving side resonance electricity
Appearance has carried out deconsolidation process, and rectification side input current waveform is made to become the square wave for being adapted to the circuit.The negative terminal of comparator be to
Fixed reference voltage Vref, the scaling of proper proportion is carried out to the voltage swing at secondary coil both ends, as the comparator
Anode input, by changing VrefChange the output of comparator, obtains the PWM wave of certain duty ratio, to drive rectifying part
Opening and turning off for switching tube, then adjusts the output voltage of load.If load output voltage is made to keep stablizing, comparator
Anode samples load output voltage, adjusts (pi regulator) by PI and exports Vref-i, with the secondary coil two after partial pressure
End voltage compares, to adjust the duty ratio of PWM wave, the time that driving rectification circuit switching tube is cut-off maintains load output electricity
The stabilization of pressure.
A kind of radio energy transmission system of adjustable load output voltage provided by the invention, makes circuit in nominal load
It is lower to realize the adjustable of output voltage, the transimission power of system can be improved, while the closed loop design of the circuit passes radio energy
Defeated system is still able to achieve the electric energy transmission of higher-wattage in the case where light load, makes output voltage stabilization in the fluctuation of load.
The radio energy voltage-regulating system structure is simple, designs flexible adjustment, has stronger practicability.
The radio energy transmission system of a kind of adjustable load output voltage provided by the invention, without passing letter toward source stealpass
Breath has higher reliability, and regulating circuit structure is simple, and control flexibly, has stronger practicability.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of radio energy transmission system of adjustable load output voltage, it is characterised in that: including comparator control circuit,
Transmitting terminal inverter circuit, receiving end rectification circuit and LC-LC series resonant network, the receiving end rectification circuit peripheral hardware is with reference to electricity
Press Vref, the transmitting terminal inverter circuit connect by LC-LC series resonant network with the receiving end rectification circuit, the LC-
LC series resonant network includes the coil L for being connected on transmitting terminal inverter circuit1, resonant capacitance C1Be connected on receiving end rectified current
The coil L on road2, resonant capacitance C2, the coil L2It is connect with the comparator control circuit, by coil L2The electricity at both ends
Pressure is sampled and is divided, and is inputted as the anode of comparator control circuit, with peripheral hardware reference voltage VrefIt compares,
It generates the PWM wave of certain duty ratio, drives cut-offfing for metal-oxide-semiconductor in the rectification circuit of receiving end, it is right to adjust the output voltage of load
Output voltage carries out closed loop design, and voltage output when load change can be made to remain unchanged.
2. the radio energy transmission system of adjustable load output voltage according to claim 1, it is characterised in that: described
Receiving end rectification circuit is the driving rectification circuit of double inductive drops.
3. the radio energy transmission system of adjustable load output voltage according to claim 1, it is characterised in that: described
Receiving end rectification circuit includes metal-oxide-semiconductor M1With metal-oxide-semiconductor M2, filter inductance L3With filter inductance L4And load R, the filtered electrical
Feel L3One end and the resonant capacitance C2Connection, the filter inductance L3The other end and the filter inductance L4One end connect
It connects, the filter inductance L4The other end and the connection coil L2, the metal-oxide-semiconductor M1Drain electrode be connected to the filter inductance
L3, resonant capacitance C2Between, the metal-oxide-semiconductor M1Source electrode and the metal-oxide-semiconductor M2Source electrode connection, the metal-oxide-semiconductor M2Drain electrode connect
It is connected to the filter inductance L4, coil L2Between, one end of the load R is connected to the metal-oxide-semiconductor M1Source electrode and the MOS
Pipe M2Source electrode between, it is described load R the other end be connected to the filter inductance L3, filter inductance L4Between.
4. the radio energy transmission system of adjustable load output voltage according to claim 3, it is characterised in that: described
Load R is parallel with capacitor C7。
5. the radio energy transmission system of adjustable load output voltage according to claim 3, it is characterised in that: series connection
The coil L2, resonant capacitance C2It is parallel with capacitor C3。
6. the radio energy transmission system of adjustable load output voltage according to claim 1, it is characterised in that: described
Transmitting terminal inverter circuit includes metal-oxide-semiconductor M3With metal-oxide-semiconductor M4, the metal-oxide-semiconductor M3Source electrode and the metal-oxide-semiconductor M4Drain electrode connection, institute
State resonant capacitance C1It is connected to the metal-oxide-semiconductor M3Source electrode and the metal-oxide-semiconductor M4Drain electrode between, the coil L1It is connected to institute
State metal-oxide-semiconductor M4Source electrode, the metal-oxide-semiconductor M3Drain electrode connect voltage source anode, the metal-oxide-semiconductor M4Source electrode connect voltage source negative pole.
7. a kind of wireless power transmission method of adjustable load output voltage, it is characterised in that: appoint in claim 1 to 6
On the radio energy transmission system of adjustable load output voltage described in one, following control is carried out: by coil L2Two
The voltage at end is sampled and is divided, and is inputted as the anode of comparator control circuit, with peripheral hardware reference voltage VrefIt carries out
Comparison, generates the PWM wave of certain duty ratio, drives cut-offfing for metal-oxide-semiconductor in the rectification circuit of receiving end, different reference voltages is corresponding
The metal-oxide-semiconductor different conducting period carries out closed loop design to output voltage, can make load change to adjust the output voltage of load
When voltage output remain unchanged.
8. the wireless power transmission method of adjustable load output voltage according to claim 7, it is characterised in that: adjust
Reference voltage Vref, with coil L2The voltage at both ends is made comparisons, and the PWM wave of certain duty ratio is obtained, to adjust receiving end rectification
The switch off time of metal-oxide-semiconductor in circuit turns on and off the work for changing circuit by the delay of metal-oxide-semiconductor in the rectification circuit of receiving end
State, to change the output voltage of load.
9. the wireless power transmission method of adjustable load output voltage according to claim 7, it is characterised in that: to this
Radio energy transmission system carries out closed loop adjusting, the output voltage V needed on the one hand settingref-o, compared with load voltage, go forward side by side
Row PI is adjusted, and exports reference value Vref-i, on the other hand, reference value Vref-iThen with coil L2The voltage at both ends is compared, and is obtained
The PWM wave of certain duty ratio drives cut-offfing for metal-oxide-semiconductor in the rectification circuit of receiving end, to obtain the output voltage values of demand.
10. the wireless power transmission method of adjustable load output voltage according to claim 7, it is characterised in that: ratio
Negative terminal compared with device control circuit is given reference voltage Vref, to coil L2The voltage swing at both ends zooms in and out, as
The anode of the comparator control circuit inputs, by changing reference voltage VrefChange the output of comparator control circuit, obtains
The PWM wave of certain duty ratio then adjusts the defeated of load to drive opening and turning off for metal-oxide-semiconductor in the rectification circuit of receiving end
Voltage out, if load output voltage is made to keep stablizing, the anode of comparator control circuit samples load output voltage,
Output reference value V is adjusted by PIref-i, with the coil L after partial pressure2Both end voltage compares, so that the duty ratio of PWM wave is adjusted,
The time that metal-oxide-semiconductor is cut-off in driving receiving end rectification circuit, maintain the stabilization of load output voltage.
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| CN201910497564.3A CN110086265A (en) | 2019-06-10 | 2019-06-10 | A kind of radio energy transmission system and method for adjustable load output voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114114112A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Input voltage regulating circuit and method of coil and magnetic resonance imaging system |
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