CN112290696A - Wireless power transmission system and method capable of inhibiting frequency splitting phenomenon - Google Patents
Wireless power transmission system and method capable of inhibiting frequency splitting phenomenon Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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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Abstract
The wireless power transmission system comprises a transmitting module, a receiving module and a control module, wherein the transmitting module and the control module are respectively connected with the receiving module, and a direct current output end in the receiving module is connected with a battery load through a DC/DC converter; the method aims at the problem that the frequency splitting phenomenon in the two-coil magnetic coupling resonance type wireless power transmission system causes low system transmission power, analyzes the frequency splitting phenomenon in the two-coil power transmission from the angle of a mutual inductance model, and achieves the purposes of inhibiting frequency splitting and improving the output power and efficiency of the system by adding a DC/DC converter at a load end to equivalently adjust load impedance.
Description
Technical Field
The present disclosure relates to the field of wireless power transmission technologies, and in particular, to a wireless power transmission system and method capable of suppressing a frequency splitting phenomenon.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Wireless Power Transfer (WPT) technology refers to a technology of transmitting electric energy from a transmitting end to a receiving end through a transmission medium, such as a magnetic field and an electric field, and has the advantages of safety, reliability, flexibility and low wear, so that the WPT technology is widely applied to the fields of biomedicine, electric vehicles, intelligent electronic devices and the like.
The wireless power transmission technology mainly includes an electromagnetic induction type, an electromagnetic resonance type, an electric field coupling type, and a microwave radiation type. In 2007, the students of the national general staff of Massachusetts successfully lighten 60W bulbs with the length of 2m by using the electromagnetic resonance type wireless power transmission technology, which raises the hot tide of resonance type charging.
The working principle of the electromagnetic resonance type technology is that when a high-frequency emission source and a receiving coil of a transmitting coil are both in the same frequency, namely the resonant frequency, the transmitting coil emits electromagnetic waves with a certain fixed frequency, and the receiving coil resonates with the transmitting coil to absorb the emitted energy. This technique requires that the system must be at resonant frequency to ensure maximum power transfer.
However, the inventor of the present disclosure finds that, in actual power transmission, because the load resistance value may change, the output power may have a plurality of extreme points, the maximum point corresponds to a resonant frequency, the maximum point of the output power corresponding to the resonant frequency of the original system will become a minimum point, the output power will decrease greatly, and an adverse effect is generated on power transmission, which is called a frequency splitting phenomenon, and the frequency splitting phenomenon increases the complexity of system control and the instability of the system, and has a great effect on the transmission power of the system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a wireless power transmission system and a wireless power transmission method capable of inhibiting the frequency splitting phenomenon.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a first aspect of the present disclosure provides a wireless power transmission system capable of suppressing a frequency splitting phenomenon.
A wireless electric energy transmission system capable of inhibiting frequency splitting phenomena comprises a transmitting module, a receiving module and a control module, wherein the transmitting module and the control module are respectively connected with the receiving module, and a direct current output end in the receiving module is connected with a battery load through a DC/DC converter.
As some possible implementation manners, the transmitting module includes a power supply, an inverting unit, a primary side compensation unit and a transmitting coil, which are connected in sequence, and the direct-current power supply is changed into alternating current with a specific frequency through the inverting unit and is transmitted to the receiving module through the transmitting coil.
As a further limitation, the primary side compensation unit and the transmitting coil form a series resonant network, and the transmitting coil and the receiving coil in the receiving module generate resonance to transmit electric energy.
As some possible implementation manners, the receiving module includes a receiving coil, a secondary compensation unit, a rectification filter unit, a DC/DC converter, and a battery load, which are connected in sequence, a series resonant network formed by the secondary compensation unit and the receiving coil transmits the alternating current to the rectification filter unit through the series resonant network, and the rectification filter unit outputs the direct current to the battery load after passing through the DC/DC converter.
As some possible implementations, the control module includes a load voltage detection unit, a load current detection unit, a regulation unit, and a PWM generator unit;
the load voltage detection unit and the load current detection unit detect the voltage and the current of the battery load and connect the detection signals to the adjustment unit, and the adjustment unit outputs driving signals to drive an MOS (metal oxide semiconductor) tube in the DC/DC converter to act through the PWM generator unit.
As a further limitation, the PWM generator unit automatically adjusts the duty ratio of trigger pulses of the switching tube to realize voltage adjustment and indirectly realize impedance matching.
As some possible implementations, the DC/DC converter is a BUCK converter.
As some possible realization modes, the equivalent load resistance of the input end of the system rectifier bridge is equivalent load resistance of the input end of the DC/DC converter
And (4) doubling.
As some possible realization modes, the duty ratio of the DC/DC converter is half power of the ratio of the output load of the DC/DC converter to the target equivalent load resistance of the system.
A second aspect of the present disclosure provides a method for suppressing a frequency splitting phenomenon in a wireless power transmission system.
A method for suppressing a frequency splitting phenomenon of a wireless power transmission system, which utilizes the wireless power transmission system of the first aspect of the present disclosure, includes the following steps:
obtaining the current and the voltage of a battery load to obtain the current load resistance value;
and comparing the obtained current load resistance value with a set target equivalent resistance value, generating a driving signal according to a comparison result to drive an MOS (metal oxide semiconductor) tube in the DC/DC converter, realizing DC/DC duty ratio regulation, and automatically regulating the load resistance value to a preset value, thereby enabling the system to always maintain the operation at the target output power.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the system and the method, aiming at the problem that the frequency splitting phenomenon in the two-coil magnetic coupling resonant wireless power transmission system causes low system transmission power, the frequency splitting phenomenon in the two-coil power transmission system is analyzed from the angle of a mutual inductance model, and the purpose of inhibiting frequency splitting and improving the output power and efficiency of the system is achieved by adding a DC/DC converter to a load end to equivalently adjust load impedance.
2. According to the system and the method, after the DC/DC impedance matching network is added, the frequency splitting phenomenon of the wireless power transmission system is effectively inhibited by adjusting the equivalent impedance of the system, and meanwhile, the output power and the transmission efficiency of the system are also obviously improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a block diagram of a two-coil resonant wireless power transmission system according to embodiment 1 of the present disclosure.
Fig. 2 is a circuit model of a two-coil resonant wireless power transmission system according to embodiment 1 of the present disclosure.
Fig. 3 is a graph of output power versus load resistance and frequency for the system provided in embodiment 1 of the present disclosure.
Fig. 4 is a circuit diagram of a system DC/DC converter provided in embodiment 1 of the present disclosure.
Fig. 5 is a structural diagram of a system provided in embodiment 1 of the present disclosure after a DC/DC converter is added.
Fig. 6 is a system simulation diagram provided in embodiment 1 of the present disclosure.
Fig. 7 is a diagram of system output power before and after system impedance matching provided in embodiment 1 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as described in the background art, in the electromagnetic resonance wireless power transmission technology, a frequency splitting phenomenon is very likely to occur, and a cause of the frequency splitting is impedance mismatch, and therefore, embodiment 1 of the present disclosure provides a wireless power transmission system capable of suppressing the frequency splitting phenomenon, as shown in fig. 1, including a transmitting portion, a receiving portion, and a control portion.
The transmitting section includes: the high-frequency inversion unit, the primary side compensation unit and the transmitting coil;
the receiving section includes: the device comprises a receiving coil, a secondary side compensation unit, a rectification filtering unit, a DC/DC converter and a battery load;
the control section includes: the device comprises a load voltage detection unit, a load current detection unit, a regulation unit and a PWM generator unit.
The direct current power supply is changed into specific frequency alternating current after passing through the high-frequency inversion unit, the primary side compensation unit consists of a capacitor and a series resonance network formed by the primary side compensation unit and a transmitting coil, the alternating current flows through the transmitting coil, and the transmitting coil and the receiving coil generate resonance to transmit electric energy.
The secondary side compensation unit is composed of a capacitor and a series resonance network composed of a receiving coil, alternating current is transmitted to the rectification filter unit through the resonance network, and direct current output by the rectification filter unit is transmitted to the battery load after passing through the DC/DC converter.
The DC/DC unit is a BUCK BUCK converter, and the impedance matching is indirectly realized by automatically adjusting the duty ratio of trigger pulses of a switching tube through the PWM generator to realize voltage adjustment.
The voltage detection unit and the current detection unit detect the voltage and the current of the load end and connect the detection signal to the adjustment unit, and the adjustment unit outputs a driving signal to drive the MOS tube in the BUCK converter through the PWM unit, so that the duty ratio of the MOS tube can be automatically adjusted, and the purpose of automatically adjusting the load resistance is achieved.
FIG. 2 shows a circuit model of a two-coil resonant wireless power transmission system, USAs a high-frequency AC source for the system, R1，R2Coil loss resistances, C, of the transmitting and receiving terminals, respectively1，C2A resonant capacitor, L, at the receiving end of the transmitting end1，L2Is the self-inductance of the resonance coil, M is the mutual inductance of the transmitter coil and the receiver coil, ReqIs the equivalent load resistance of the system.
The circuit model analysis steps of the two-coil resonant wireless power transmission system provided by the embodiment are as follows:
the KVL equation is written for the transmit coil and receive coil, respectively, in columns:
in the formula (1), I1，I2ω is the resonant angular frequency of the circuit, where,
the currents at the transmitting end and the receiving end can be solved as follows:
obtaining formulas of the output power and the efficiency of the wireless power transmission system according to the formulas (1) and (2):
when the system is resonating, i.e.
The output power and efficiency of the system are:
the relationship between the output power and the resistance and the frequency of the load obtained from the parameters in table 1 and the formula (4) is shown in fig. 3.
Table 1: parameter lists for system models
It is seen from fig. 3 that as the load resistance value decreases, the frequency shift is larger, the frequency splitting phenomenon is more obvious, at this time, there is no more one system resonance point, and the maximum value point of the original system at the resonance frequency is changed into the minimum value point. At non-resonant frequencies, the inductance and capacitance in the circuit cannot be fully compensated, and power is consumed in a reactive manner. The smaller the load resistance value, the more severely the output power at the resonance frequency is attenuated.
Since frequency splitting is directly related to the load resistance, an impedance matching network can be used to adjust the equivalent load resistance. Common impedance matching networks include an L-type matching network, a pi-type matching network, and a DC/DC matching network. Because the DC/DC matching network is flexibly and simply controlled, the embodiment uses the BUCK converter to equivalently adjust the load impedance to inhibit frequency splitting, and improves the power and the efficiency of the system
The principle of the BUCK converter provided by fig. 4 follows:
Uo＝DUin (5)
wherein, D is the on-time duty ratio of the switching tube, and power loss in the circuit is not considered, that is, all generated power is consumed by the load and can be obtained:
as can be seen from the formula (8), the load resistance can be equivalently adjusted by adjusting the duty ratio, and the equivalent load resistance R is obtained because the duty ratio of the BUCK circuit is 0-1eqIn the regulation range of RLTo + ∞, and is suitable for a circuit in which frequency division occurs due to reduction in resistance.
The resistance after two equivalents is obtained from FIG. 5
The system output power and efficiency after the BUCK BUCK converter is added are as follows:
the present embodiment is verified by using the simulation shown in fig. 6, and the simulation model shown in fig. 6 is composed of a dc power supply, an inverter circuit, a coupling coil, a rectifying and filtering circuit, a BUCK converter, a load and a regulating module.
The current and voltage are collected at a load end, the current load resistance value is calculated, the current load resistance value is compared with a set target equivalent resistance value, the duty ratio of the BUCK circuit is obtained by using a formula (8), and the duty ratio of the BUCK circuit is transmitted to a PWM generator to change the duty ratio of the BUCK circuit in real time, so that the system is always kept in the target output power to operate.
As shown in fig. 7, which is a diagram of system output power before and after adding the impedance matching network, it can be seen from fig. 7 that, after adding the impedance matching network, the output power is significantly improved compared with the wireless charging system without adding the impedance matching network.
As shown in table 2, for the system transmission efficiency before and after the impedance matching network is added, it can be seen that the efficiency is also improved by adding the impedance matching network.
Table 2: system transmission efficiency before and after adding impedance matching network
In conclusion, after the DC/DC impedance matching network is added, the frequency splitting phenomenon of the wireless power transmission system is effectively inhibited by adjusting the equivalent impedance of the system. The output power and transmission efficiency of the system are also obviously improved. Therefore, the impedance matching method provided by the embodiment can play a role in inhibiting frequency splitting and improving the power and efficiency of the system.
The embodiment researches the frequency splitting phenomenon of the two-coil resonant wireless power transmission system, and provides an impedance matching method to inhibit the frequency splitting phenomenon, thereby being beneficial to the research and development of the wireless power transmission system.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A wireless power transmission system capable of inhibiting frequency splitting phenomena is characterized by comprising a transmitting module, a receiving module and a control module, wherein the transmitting module and the control module are respectively connected with the receiving module, and a direct current output end in the receiving module is connected with a battery load through a DC/DC converter.
2. The wireless power transmission system capable of suppressing the frequency splitting phenomenon as claimed in claim 1, wherein the transmitting module includes a power supply, an inverting unit, a primary side compensating unit and a transmitting coil connected in sequence, and the dc power supply is changed into a specific frequency ac power by the inverting unit and transmitted to the receiving module by the transmitting coil.
3. The wireless power transmission system capable of suppressing the frequency splitting phenomenon as claimed in claim 2, wherein the primary side compensation unit and the transmitting coil form a series resonant network, and the transmitting coil resonates with a receiving coil in the receiving module to transmit power.
4. The wireless power transmission system capable of suppressing the frequency splitting phenomenon according to claim 1, wherein the receiving module includes a receiving coil, a secondary compensation unit, a rectifying and filtering unit, a DC/DC converter and a battery load, which are connected in sequence, the secondary compensation unit and the receiving coil form a series resonant network, the series resonant network transmits the alternating current to the rectifying and filtering unit, and the rectifying and filtering unit outputs the direct current to the battery load after passing through the DC/DC converter.
5. The wireless power transmission system capable of suppressing the frequency splitting phenomenon as claimed in claim 1, wherein the control module includes a load voltage detecting unit, a load current detecting unit, a regulating unit, and a PWM generator unit;
the load voltage detection unit and the load current detection unit detect the voltage and the current of the battery load and connect the detection signals to the adjustment unit, and the adjustment unit outputs driving signals to drive an MOS (metal oxide semiconductor) tube in the DC/DC converter to act through the PWM generator unit.
6. The wireless power transmission system capable of suppressing the frequency splitting phenomenon as claimed in claim 5, wherein the impedance matching is indirectly achieved by the voltage adjustment achieved by the PWM generator unit automatically adjusting the duty ratio of the trigger pulse of the switching tube.
7. The wireless power transmission system capable of suppressing the frequency splitting phenomenon as claimed in claim 1, wherein the DC/DC converter is a BUCK converter.
8. The device according to claim 1, capable of suppressing frequency splitting phenomenonThe wireless power transmission system is characterized in that the equivalent load resistance of the input end of the system rectifier bridge is the equivalent load resistance of the input end of the DC/DC converter
And (4) doubling.
9. The wireless power transmission system capable of suppressing the frequency splitting phenomenon according to claim 1, wherein a duty ratio of the DC/DC converter is a half power of a ratio of an output load of the DC/DC converter to a target equivalent load resistance of the system.
10. A method for suppressing a frequency splitting phenomenon in a wireless power transmission system, using the wireless power transmission system according to any one of claims 1 to 8, comprising the steps of:
obtaining the current and the voltage of a battery load to obtain the current load resistance value;
and comparing the obtained current load resistance value with a set target equivalent resistance value, generating a driving signal according to a comparison result to drive an MOS (metal oxide semiconductor) tube in the DC/DC converter, realizing DC/DC duty ratio regulation, and automatically regulating the load resistance value to a preset value, thereby enabling the system to always maintain the operation at the target output power.
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Application publication date: 20210129 |