CN111478457B - Multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control - Google Patents
Multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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 invention provides a multi-frequency multi-load wireless electric energy transmission system based on multi-modulation wave composite SPWM control, which comprises a direct-current power supply, a high-frequency inverter circuit, a primary electric energy transmitting coil, a secondary multi-frequency multi-load electric energy receiving device and a multi-modulation wave composite SPWM control circuit, wherein the secondary multi-frequency multi-load electric energy receiving device comprises n electric energy receiving loops; the multi-modulation wave composite SPWM control circuit adopts a unipolar frequency multiplication modulation mode to generate a switch driving signal, so that the high-frequency inverter circuit generates a high-frequency composite pulse wave containing signals required by n electric energy receiving circuits; the n electric energy receiving loops in the secondary multi-frequency multi-load electric energy receiving device are induced by respective receiving coils to obtain voltages, electric energy with corresponding frequencies is obtained through respective resonant network separation, and wireless electric energy transmission of n loads is achieved. The invention can realize multi-frequency multi-load independent electric energy transmission and control, can adapt to the power supply requirements of loads with different working frequencies, and has stable electric energy transmission and higher transmission efficiency.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control.
Background
The wireless electric energy transmission technology is a new technology which integrates a plurality of disciplines such as power electronics, control science, electromagnetism, material science and the like, realizes wireless flexible transmission of electric energy in the complete sense by means of space intangible soft media (such as magnetic fields, electric fields, lasers, microwaves and the like), is regarded as an important way for realizing clean, flexible and efficient utilization of energy, and is widely concerned and researched by the international society.
At present, the research and application of magnetic coupling resonance wireless transmission technology for single load or multiple loads are mostly based on the research under the same frequency. However, the working frequencies of products of different merchants, different products and different application places are mostly different, so that a unified device for multi-frequency multi-load wireless power supply is lacking at present, and the reason is mainly that the inverters of the conventional magnetic coupling resonance wireless power transmission system mostly adopt a conventional 180-degree modulation mode, and wireless transmission of electric energy is realized based on fundamental wave components in square waves output by the inverters, and although wireless transmission of electric energy is realized to a certain extent by the conventional inverter control mode, the following defects still exist:
1. the compatibility of multi-frequency multi-load wireless power supply cannot be realized: at any moment, only one fundamental frequency component frequency output by the inverter can provide electric energy for a specific load at the frequency, and the inverter cannot effectively supply power for loads working at other frequencies, namely, a primary wireless power supply system cannot be shared to ensure high-efficiency wireless power supply of different loads in multiple frequency bands.
2. The wide-range efficient electric energy transmission control cannot be realized: in order to realize load voltage output regulation, the voltage regulation range is not wide enough due to the adoption of inverter phase shift control, and the overall efficiency of the system is influenced by the addition of an additional DC-DC voltage regulation link.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the technical defects, the invention provides a multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control, which can realize multi-frequency multi-load power independent transmission and wide-range efficient power transmission control in the wireless power transmission system.
The technical scheme is as follows: in order to realize the technical effects, the invention provides the following technical scheme:
multifrequency many loads wireless power transmission system based on compound SPWM control of many modulated waves includes: the device comprises a direct-current power supply, a high-frequency inverter circuit, a primary side electric energy transmitting coil, a secondary side multi-frequency multi-load electric energy receiving device and a multi-modulation wave composite SPWM control circuit; wherein the content of the first and second substances,
the direct-current power supply, the high-frequency inverter circuit, the primary side electric energy transmitting coil and the secondary side multi-frequency multi-load electric energy receiving device are sequentially cascaded; the secondary multi-frequency multi-load electric energy receiving device comprises n electric energy receiving loops, wherein each electric energy receiving loop comprises a receiving coil, a resonant network and a load which are sequentially cascaded;
the multi-modulation wave composite SPWM control circuit is arranged on the primary side of the system, the multi-modulation wave composite SPWM control circuit generates modulation wave signals with the frequency matched with the inherent resonant frequency of each electric energy receiving loop according to different working frequency requirements of loads in the n electric energy receiving loops, then adjusts the amplitude of the corresponding modulation wave signals according to the power requirements of each load, superposes the modulation waves to obtain composite modulation waves, and finally adopts a unipolar frequency multiplication modulation mode to generate a switch driving signal by using two composite modulation waves with equal amplitude and opposite polarity and carrier modulation so that the high-frequency inverter circuit generates high-frequency composite pulse waves containing signals required by the n electric energy receiving loops;
the n electric energy receiving loops in the secondary multi-frequency multi-load electric energy receiving device are induced by respective receiving coils to obtain voltages, electric energy with corresponding frequencies is obtained through respective resonant network separation, and wireless electric energy transmission of n loads is achieved.
Furthermore, the high-frequency inverter circuit is a full-bridge inverter circuit composed of 4 switching tubes.
Further, the expression of the composite modulated wave is as follows:
u r ＝u r1 +u r2 +…+u m ＝＝a 1 sin2πf 1 t+a 2 sin2πf 2 t+…+a n sin2πf n t
wherein u is r Representing a complex modulated wave u r1 To u m Modulated wave signals f representing the 1 st to the n-th power receiving circuits, respectively 1 To f n Respectively representing the frequencies of n modulated wave signals, a 1 To a n Respectively representing the amplitudes of the n modulated wave signals.
Further, the method for generating the switch driving signal by using the unipolar frequency multiplication modulation mode comprises the following steps:
modulating the composite wave u r And carrier u c Modulated signal and u r And u c The complementary signal of the modulated signal is used as the driving signal of the front bridge arm in the high-frequency inverter circuit to compound the modulated wave-u r And carrier u c Modulated signal and-u r And u c And the complementary signal of the modulated signal is used as a driving signal of a rear bridge arm in the high-frequency inverter circuit, so that a high-frequency composite pulse wave containing signals required by n electric energy receiving circuits is generated behind the high-frequency inverter.
Has the beneficial effects that: compared with the prior art, the invention has the following advantages:
1. the invention obtains multi-frequency mixed signals by using a unipolar frequency multiplication SPWM control technology based on multi-modulation wave compounding, can realize independent power supply and control of multiple loads with any number and any frequency within a certain range, and does not influence each load during working.
2. According to the system disclosed by the invention, the output waveform frequency of the high-frequency inverter can be quickly adjusted by changing the frequency of the modulation wave according to the requirements of the working frequency and power of the electric equipment, and the output voltage can be quickly adjusted by changing the amplitude values of the modulation waves with different frequencies, so that the real-time control of the frequency and the power is realized, the high-efficiency electric energy transmission in a wide range is realized, and the flexibility of the system application is improved. Compared with a 180-degree modulation mode, the method has the advantages of convenience in output frequency and voltage regulation and the like.
3. The multi-frequency multi-load power transmission system can realize stable and efficient multi-frequency multi-load power transmission, namely the system has high working efficiency, different resonance compensation circuits can better perform frequency separation, and the high-efficiency adaptive charging of electric equipment with different working frequencies is realized.
Drawings
Fig. 1 is a circuit diagram of a multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control according to an embodiment;
FIG. 2 is a block diagram of a multi-modulation wave composite SPWM control circuit according to an embodiment;
FIG. 3 is a circuit simulation diagram involved in the embodiment;
fig. 4 is an equivalent circuit model diagram of the dual-frequency dual-load system involved in the embodiment.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments. It is to be understood that the present invention may be embodied in various forms, and that there is no intention to limit the invention to the specific embodiments illustrated, but on the contrary, the intention is to cover some exemplary and non-limiting embodiments shown in the attached drawings and described below.
It is to be understood that the features listed above for the different embodiments may be combined with each other to form further embodiments within the scope of the invention, where technically feasible. Furthermore, the particular examples and embodiments of the invention described are non-limiting, and various modifications may be made in the structure, steps, and sequence set forth above without departing from the scope of the invention.
Example (b):
fig. 1 shows a multi-frequency multi-load wireless power transmission system based on multi-modulation wave complex SPWM control according to the present embodiment, which includes: the device comprises a direct-current power supply 1, a high-frequency inverter circuit 2, a primary side electric energy transmitting coil 3, a secondary side multi-frequency multi-load electric energy receiving device 4 and a multi-modulation wave composite SPWM control circuit 5. The direct-current power supply 1, the high-frequency inverter circuit 2, the primary side electric energy transmitting coil 3 and the secondary side multi-frequency multi-load electric energy receiving device 4 are sequentially cascaded.
In this embodiment, the primary side of the wireless power transmission system adopts a zero compensation strategy, i.e. the primary side power transmitting coil 3 (with an inductance value of L) is not provided with p ) Any compensation is applied. The secondary multi-frequency multi-load power receiving device 4 includes n power receiving circuits, and each power receiving circuit includes a receiving coil, a resonant network, and a load, which are connected in series. In the system shown in figure 1 of the drawings,L 1 、C 1 forming a frequency of f 1 Of the resonant network, L 2 、C 2 Forming a frequency of f 2 L.l. n 、C n Forming a frequency of f n The output end of each resonant network is respectively connected with the load R L1 、R L2 ...R Ln And the parameters of the n electric energy receiving loops meet the following requirements:
because the alternating current transmission frequency of the current magnetic coupling resonance wireless power transmission system is mostly in the range of dozens of kHz to hundreds of kHz, if an SPWM modulation mode is adopted, the modulation wave frequency is in the range of dozens of kHz to hundreds of kHz. In order to ensure the effective transmission of electric energy and reduce the waveform distortion rate, the carrier ratio is at least more than 20, which leads to higher switching frequency of the inverter, which reaches more than several hundred kHz to several MHz, thereby putting higher requirements on the switching devices of the inverter. The switching frequency of new high-frequency power electronic devices represented by SiC and GaN which have appeared in recent years can reach MHz. Therefore, in the present embodiment, the high-frequency inverter circuit 2 is a full-bridge inverter circuit composed of four Gallium Nitride Metal-Oxide-Semiconductor Field Effect transistors (GaN MOSFETs), and is capable of adapting to a larger operating frequency.
The multi-modulation wave composite SPWM control circuit 5 is arranged on the primary side of the system, the multi-modulation wave composite SPWM control circuit 5 generates modulation wave signals with the frequency matched with the inherent resonant frequency of each electric energy receiving loop according to different working frequency requirements of loads in the n electric energy receiving loops, then adjusts the amplitude of the corresponding modulation wave signals according to the power requirements of each load, superposes the modulation waves to obtain composite modulation waves, and finally adopts a unipolar frequency multiplication SPWM modulation mode to generate a switch driving signal by modulating two composite modulation waves with the same amplitude and opposite polarities with a carrier wave so that the high-frequency inverter circuit generates a high-frequency composite pulse wave containing signals required by the n electric energy receiving loops. The complex modulation wave signal here is:
u r ＝u r1 +u r2 +…+u m
＝a 1 sin2πf 1 t+a 2 sin2πf 2 t+…+a n sin2πf n t
wherein u is r Representing a complex modulated wave, u r1 To u m Modulated wave signals f representing the 1 st to the n-th power receiving circuits, respectively 1 To f n Respectively representing the frequencies of n modulated wave signals, a 1 To a n Respectively representing the amplitudes of the n modulated wave signals.
The single-polarity frequency multiplication SPWM modulation mode is shown in figure 2:
using two complex modulated waves u with equal amplitude and opposite polarity r And-u r And carrier u c The modulation generates a switching drive signal of the high-frequency inverter circuit 2. Complex modulated wave u r And carrier u c Modulated signal and u r And u c The complementary signal of the modulated signal is used as the driving signal of the front bridge arm in the high-frequency inverter circuit 2 to compound the modulated wave-u r And carrier u c Modulated signal and-u r And u c The complementary signal of the modulated signal is used as the driving signal of the rear arm in the high-frequency inverter circuit 2. The output voltage of the high-frequency inverter circuit 2 includes U in the positive half cycle d And two levels of 0, including 0 and-U in the negative half cycle d Two levels. Since the output voltage of the high-frequency inverter has two state transitions in one carrier cycle, the pulse frequency is 2 times of the switching frequency. The output harmonic performance of the modulation method of unipolar frequency doubling is equivalent to a single-phase unipolar SPWM with twice carrier frequency, but the frequency of the switching tube is not doubled. Therefore, the loss of the switching tube is not increased, and the harmonic suppression capability of the switching tube is stronger than that of a unipolar control strategy and a bipolar control strategy under the same condition, so that the SPWM control technology of the wireless power transmission system is possible.
The working principle of the multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control related in the embodiment is as follows: according to the requirements of the working frequency and power of actual electric equipment, the number of the composite modulation waves is determined by the number of the loads, the frequency of the composite modulation waves is determined by the working frequency of different loads, and the amplitude of the signal of the composite modulation waves is adjusted by the power requirements of different loads. The method comprises the following specific steps:
(1) According to different loads R L1 、R L2 ...R Ln Natural resonant frequency f of secondary circuit 1 、f 2 ...f n Setting the corresponding frequency to f 1 、f 2 ...f n The modulated wave signal of (2). Adjusting the amplitude a of sine waves with different frequencies according to different load power requirements 1 、a 2 ...a n The amplitude of the undesired signal is set to 0.
(2) Will differ in frequency f 1 、f 2 ...f n Different amplitudes alpha 1 、a 2 ...a n N electric energy modulation waves are summed to obtain a composite modulation wave signal u r And getting the result of reaction-u r . The composite modulated wave u r And carrier u c Modulated signal and u r And u c The complementary signal of the modulated signal is used as the driving signal of the front bridge arm to compound the modulated wave-u r Signal modulated with carrier uc and-u r And u c And the complementary signal of the modulated signal is used as a driving signal of the rear bridge arm, so that a high-frequency composite pulse wave containing n signals required by the electric energy receiving circuit is generated after the high-frequency inverter. By adopting the unipolar frequency multiplication SPWM control mode, the pulse frequency of the output voltage of the high-frequency inverter is twice of the switching frequency, so that the inverter power supply can obtain better output waveform under lower switching frequency.
(3) Based on the electromagnetic induction coupling principle, the n loads respectively obtain electric energy with corresponding frequency through the resonant networks of the n secondary sides, so that the wireless electric energy transmission of the n loads with different frequencies of the system is realized.
Because the amplitude of the output voltage of the system is in direct proportion to the modulation degree, and the appropriate modulation degree is set, namely the ratio of the amplitude of the modulation wave to the amplitude of the carrier wave is adjusted, different power requirements of the system load can be met, and multi-frequency multi-load independent electric energy transmission and control are realized. The system utilizes multi-modulation wave composite SPWM control to realize multi-frequency multi-load wireless electric energy transmission and control, and changes the frequency of a corresponding modulation wave signal to adapt to different working frequency load power supply requirements; the amplitude of the modulation wave signal is adjusted to meet the load power control requirement. According to the actual application frequency and power requirements, the frequency and amplitude corresponding to each modulation wave of the SPWM controller are changed, namely the carrier ratio and modulation degree corresponding to each modulation wave of the SPWM controller are changed, and the directional power transmission and control of specific frequency energy to respective target load can be realized.
The technical effects of the invention are further verified by experimental analysis by substituting specific parameters.
Setting n =2, building a simulation circuit shown in fig. 3, and setting a direct-current power supply V in =80V, and the frequencies of the two modulation waves are respectively set to f 1 =40kHz and f 2 =120kHz; the parameter of the primary side electric energy transmitting coil 3 is set to be L p =130 μ H, equivalent internal resistance R p =0.1 Ω, and the coupling coefficient k is 0.2. In the secondary multi-frequency multi-load power receiving apparatus 4, the power receiving circuit parameter having the natural resonant frequency f1 is set to L 1 =130 μ H, equivalent internal resistance R i =0.1 Ω, resonant capacitance C 1 =0.1218 μ F; natural resonant frequency f 2 Is set to L 2 =130 muH, equivalent internal resistance R 2 =0.1 Ω, resonant capacitance C 2 =0.01353 μ F, the mutual inductance between the transmitter coil and the receiver coil is the same, the mutual inductance between the receiver coils is ignored, and the load R is Li ＝R L2 =3 Ω. The circuit is a double-frequency double-load wireless power transmission system, and an equivalent circuit model of the circuit is shown in figure 4. The process of the double-frequency double-load wireless power transmission is as follows:
when the system sets the carrier frequency f of the multi-modulation wave composite SPWM control circuit c The frequency is 400kHz, and due to the adoption of unipolar frequency doubling modulation, the output harmonic performance of the high-frequency inverter is equivalent to single-phase unipolar SPWM with the carrier frequency of 800 kHz.
Setting two modulation wave signal amplitude a 1 、a 2 Is 0.64, the carrier amplitude is 1, and the ratio of the complex modulated wave amplitude to the carrier amplitude is about 0.985.
According to the data, the analysis of the dual-frequency dual-load wireless power transmission is as follows:
a. the high-frequency inverter circuit 2 outputs voltage effective values of different frequencies:
ω 1 ＝2πf 1 ＝80000π，ω 2 ＝2πf 2 ＝240000π
wherein: f. of 1 、f 2 The natural resonant frequency of the two receiving loops is also the frequency of two paths of modulated waves; a is a 1 、a 2 Are respectively the frequency f 1 、f 2 The amplitude of the modulated wave of (1).
b. Analyzing the impedance of the receiving loop:
wherein Z is 11 、Z 21 Are respectively the frequency f 1 When the modulation wave of (2) is used alone, the natural resonant frequency f 1 、f 2 The input impedance of the power receiving circuit of (a); z 12 、Z 22 Are respectively the frequency f 2 When the modulated wave of (2) is acted on alone, the natural resonant frequency f 1 、f 2 The input impedance of the power receiving circuit.
c. Solving for the input impedance of the transmitting terminal and the different loop currents
Transmitting end input impedance:
transmitting end loop current:
receiving loop current:
wherein: I.C. A p1 、I 11 、I 21 Are respectively the frequency f 1 Primary side circuit and natural resonant frequency f when the modulated wave of (2) acts alone 1 、f 2 Receiving loop current from the power source; i is p2 、I 12 、I 22 Are respectively the frequency f 2 Primary side circuit and natural resonant frequency f when the modulated wave of (2) acts alone 1 、f 2 Receives the loop current.
d. Analyzing output voltage of dual-frequency dual-load magnetic coupling resonance wireless power transmission system
When the frequency f 1 When the modulated wave of (2) is operated alone, the natural resonant frequency f 2 Input impedance Z of electric energy receiving loop 21 And when the frequency f 2 When the modulated wave of (2) is operated alone, the natural resonant frequency f 1 Input impedance Z of electric energy receiving loop 12 Are all very large, therefore R L1 And R L2 Voltage canThe equivalence is as follows:
namely, the load output voltage can be correspondingly changed by adjusting the amplitude of the modulation wave.
e. And analyzing the output power and efficiency of the dual-frequency dual-load wireless power transmission system.
The average power (active power) of any port is defined as
The above-mentioned integral of the product of the sinusoidal voltage and current at different frequencies is zero (i.e. no active power is generated); the above integral of the product of sinusoidal voltage and current of the same frequency is not zero.
Therefore, the output power of the dual-frequency dual-load system:
P out ＝[|I 11 | 2 +|I 12 | 2 ]·R L1 +[|I 21 | 2 +|I 22 | 2 ]·R L2 ＝20W
and (3) system power loss:
P loss ＝[|I p1 | 2 +|I p2 | 2 ]·R p +[|I 11 | 2 +|I 12 | 2 ]·R 1 +[|I 21 | 2 +|I 22 | 2 ]·R 2 ＝0.773W
the system efficiency is as follows:
therefore, the multi-frequency multi-load wireless electric energy transmission system based on multi-modulation wave composite SPWM control can efficiently realize multi-frequency multi-load wireless electric energy transmission.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. Multifrequency many loads wireless power transmission system based on compound SPWM control of many modulated waves, its characterized in that includes: the device comprises a direct-current power supply, a high-frequency inverter circuit, a primary side electric energy transmitting coil, a secondary side multi-frequency multi-load electric energy receiving device and a multi-modulation wave composite SPWM control circuit; wherein, the first and the second end of the pipe are connected with each other,
the direct-current power supply, the high-frequency inverter circuit, the primary side electric energy transmitting coil and the secondary side multi-frequency multi-load electric energy receiving device are sequentially cascaded; the secondary multi-frequency multi-load electric energy receiving device comprises n electric energy receiving loops, wherein each electric energy receiving loop comprises a receiving coil, a resonant network and a load which are sequentially cascaded;
the multi-modulation wave composite SPWM control circuit is arranged on a system primary side, the multi-modulation wave composite SPWM control circuit generates modulation wave signals with frequencies matched with the inherent resonant frequencies of the electric energy receiving loops according to different working frequency requirements of loads in the n electric energy receiving loops, then adjusts the amplitude values of the corresponding modulation wave signals according to the power requirements of the loads, and superposes the modulation waves to obtain composite modulation waves:
u r ＝u r1 +u r2 +...+u rn ＝＝a 1 sin2πf 1 t+a 2 sin2πf 2 t+...+a n sin2πf n t
wherein u is r Representing a complex modulated wave u r1 To u m Modulated wave signals f representing the 1 st to nth power receiving circuits, respectively 1 To f n Respectively representing the frequencies of n modulated wave signals, a 1 To a n Respectively representing the amplitudes of the n modulated wave signals;
finally, theA unipolar frequency multiplication modulation mode is adopted, two composite modulation waves with equal amplitude and opposite polarity and carrier modulation are used for generating a switch driving signal, and a high-frequency inverter circuit is enabled to generate a high-frequency composite pulse wave containing signals required by n electric energy receiving circuits; the method for generating the switch driving signal by adopting the unipolar frequency multiplication modulation mode comprises the following steps: modulating the composite wave u r And carrier u c Modulated signal and u r And u c The complementary signal of the modulated signal is used as the driving signal of the front bridge arm in the high-frequency inverter circuit to compound the modulated wave-u r And carrier u c Modulated signal and-u r And u c The complementary signal of the modulated signal is used as a driving signal of a rear bridge arm in the high-frequency inverter circuit, so that a high-frequency composite pulse wave containing signals required by n electric energy receiving circuits is generated behind the high-frequency inverter;
the n electric energy receiving loops in the secondary multi-frequency multi-load electric energy receiving device obtain voltages through respective receiving coils in an induction mode, electric energy with corresponding frequencies is obtained through respective resonant network separation, and wireless electric energy transmission of n loads is achieved.
2. The multi-frequency multi-load wireless power transmission system based on the multi-modulation wave composite SPWM control as recited in claim 1, wherein the high-frequency inverter circuit is a full-bridge inverter circuit composed of 4 switching tubes.
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| CN104113219B (en) * | 2014-04-28 | 2016-06-15 | 中国船舶重工集团公司第七二三研究所 | LCC resonant mode high_frequency sine wave power supply |
| CN208386253U (en) * | 2018-05-21 | 2019-01-15 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
| CN108667154B (en) * | 2018-05-21 | 2024-03-29 | 南昌大学 | Multi-frequency multi-load wireless charging platform with load isolation characteristic |
| CN110611375A (en) * | 2019-10-28 | 2019-12-24 | 华南理工大学 | Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle |
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