CN109067015B - Wireless power transmission method of self-adaptive variable receiving coil - Google Patents
Wireless power transmission method of self-adaptive variable receiving coil Download PDFInfo
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- CN109067015B CN109067015B CN201811118120.6A CN201811118120A CN109067015B CN 109067015 B CN109067015 B CN 109067015B CN 201811118120 A CN201811118120 A CN 201811118120A CN 109067015 B CN109067015 B CN 109067015B
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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
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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Abstract
The invention belongs to the field of electronic communication, and relates to a wireless power transmission method, in particular to a wireless power transmission method of a self-adaptive variable receiving coil. According to the method, under the condition that the TX coil is fixed, the area of the RX coil is changed in real time, the output voltage is controlled, and the transmission efficiency is improved. When enough high power is stably output, the circuit board can be prevented from being damaged, and the electromagnetic compatibility can be improved. Furthermore, the method can reduce the voltage stabilizing chip in RX, thereby further improving the whole transmission efficiency. When enough high power is stably output, the circuit board can be prevented from being damaged, and the electromagnetic compatibility can be improved. Furthermore, the method can reduce the voltage stabilizing chip in RX, thereby further improving the whole transmission efficiency.
Description
Technical Field
The invention belongs to the field of electronic communication, and relates to a wireless power transmission method, in particular to a wireless power transmission method of a self-adaptive variable receiving coil.
Background
A wireless energy transmission system (hereinafter referred to as a system) based on electromagnetic field generally comprises two parts, namely an energy transmitting device (hereinafter referred to as TX) and an energy receiving device (hereinafter referred to as RX). The working principle is that the process of transmitting energy from TX to RX is realized through the conversion of an alternating electromagnetic field. According to the physics principle, when TX and RX generate magnetic resonance (or resonance) with each other, the magnitude and efficiency of the transmitted energy are greatly improved.
Generally, to obtain sufficient transmission efficiency and a specific output voltage, the system is adjusted mainly by (1) changing its resonant frequency by changing the value of the resistance capacitance in the TX and/or RX circuits, and/or (2) fixing the frequency, adjusting the signal duty cycle, and/or (3) adjusting the frequency of the TX and/or RX with the signal duty cycle fixed, etc.
Wherein, the principle of the method (1) is as follows: the coil (inductance) is not changed, only the resistance capacitance value in the circuit is changed, and the resonance frequency is theoretically calculated by utilizing an LC resonance formula and further changed. When the system resonates, the closer the operating frequencies of TX and RX are to the theoretically calculated resonant frequency, the larger the output voltage will be. The disadvantage is that when the internal resistance of the power supply is low, the circuit board is easy to burn out, and the same capacitance value in calculation is difficult to find in reality.
The principle of the method (2) is as follows: the operating frequencies of TX and RX are fixed and the output voltage is regulated by adjusting the TX signal duty cycle. By duty cycle is meant the percentage of time that the circuit is turned on for the entire circuit duty cycle. Under the condition of a certain frequency, the voltage is adjusted by changing the size of the duty ratio.
The method has the disadvantages that the system has poor transient state, zero interference to the equipment cannot be achieved, and data packet drop may occur. In actual system operation, the duty ratio and the output power are in a nonlinear relationship, i.e. difficult to control.
The principle of method (3) is to adjust the operating frequencies of TX and RX with a fixed duty cycle. If the duty ratio of the system is constant at 50%, the interference of the system to the equipment is minimum, and the transmission energy can be large enough. However, the disadvantage is that it is easy to cause the output voltage of the LC resonant circuit to increase instantaneously, resulting in burning out of the receiving end circuit board and poor electromagnetic compatibility.
The working principle of the current RX circuit is basically: rectifying (AC to DC), regulating voltage and stabilizing voltage. The voltage regulation and the voltage stabilization can be basically integrated, so that the energy transmission efficiency is improved.
Disclosure of Invention
1. The technical problem to be solved is as follows:
the existing method for transmitting radio energy has small transmission energy and low efficiency, and cannot combine the voltage regulating and stabilizing processes in an RX circuit.
2. The technical scheme is as follows:
in order to solve the above problems, the present invention provides a wireless power transmission method of an adaptive variable receiving coil, comprising the steps of: step S01: determining TX coil specifications, including dimensions and impedance values; step S02: the method comprises the steps that a wireless communication module of a wireless energy transmission system through an electromagnetic field enables an RX coil and a TX coil to be consistent; step S03: setting the working frequency and duty ratio of a TX coil and an RX coil; step S04: the TX coil is connected with a set input voltage, a current limit value is set, the wireless energy transmission system works, and the RX coil is connected with a load of the wireless energy transmission system of an electromagnetic field and is adjusted to a corresponding resistance value; step S05: changing the number of turns of the RX coil and the size parameter of the inner diameter, and then simulating to obtain the coupling coefficient between the coils and the inductance value of the coil; step S06: the wireless energy transfer system of the electromagnetic field determines whether the RX coil inner diameter is equal to or greater than the TX coil inner diameter and whether the RX coil inner diameter is less than 1 time of the TX coil inner diameter; if one of the two conditions is not satisfied, the process returns to step S05; step S07: the wireless energy transmission system of the electromagnetic field determines whether the area of the RX coil is smaller than the area of the magnetic shield sheet of the TX, if it exceeds the area, returns to step S05; step S08: the wireless energy transmission system of the electromagnetic field obtains the coupling coefficient between the coils and the inductance value of the coils, and the corresponding capacitance value is calculated through the LC resonance calculator; step S09: the wireless energy transmission system of the electromagnetic field calculates a TX coil circuit and an RX coil circuit, and input voltage, frequency, capacitance value, TX coil inductance value, RX coil inductance value and coupling coefficient of the coil in the input circuit; step S10: the wireless energy transfer system of the electromagnetic field determines whether a given RX output voltage is reached, and/or whether the system efficiency exceeds a certain value, if not, returns to step S05; step S11: the wireless energy transmission system of the electromagnetic field changes the number of turns and the size parameters of the RX coil and the inductance values of the TX coil and the RX coil in real time according to the evaluation result, measures the actual system efficiency and determines whether the output voltage value is consistent with the evaluation result or within an allowable error range, and if the actual system efficiency and the output voltage value are not consistent with the evaluation result, returns to the step S05 to finely adjust the specification of the RX coil; step S12: an RX coil is obtained that meets the output voltage and efficiency requirements.
In step S01, the impedance value is measured using a vector network analyzer.
The wireless communication module is one of Bluetooth, Wi-Fi, cellular network, NFC, RFID and NB-IOT.
In step S03, a predetermined operating frequency and a predetermined duty ratio are set by the STM chip.
The simulation described in step S05 is MAXWELL 3D simulation software.
In step S08, the number of turns of the RX coil and the size parameter of the inner diameter are slowly changed by MAXWELL 3D simulation software, and the coupling coefficient between the coils and the inductance value of the coil are obtained through simulation.
In step S09, the input voltage, frequency, capacitance value, TX coil inductance value, RX coil inductance value, and coupling coefficient of the coil in the circuit are input by Multisim circuit simulation software. In step S10, it is determined through simulation whether the predetermined output voltage is reached and the system efficiency exceeds a specific value.
In step S11, the evaluation result is a simulation result.
3. Has the advantages that:
according to the method, under the condition that the TX coil is fixed, the area of the RX coil is changed in real time, the output voltage is controlled, and the transmission efficiency is improved. When enough high power is stably output, the circuit board can be prevented from being damaged, and the electromagnetic compatibility can be improved. Furthermore, the method can reduce the voltage stabilizing chip in RX, thereby further improving the whole transmission efficiency. When enough high power is stably output, the circuit board can be prevented from being damaged, and the electromagnetic compatibility can be improved. Furthermore, the method can reduce the voltage stabilizing chip in RX, thereby further improving the whole transmission efficiency.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
The invention is explained in detail below with reference to the figures and examples.
As shown in fig. 1, the wireless power transmission method of the adaptive variable receiving coil provided by the present invention has 12 steps.
In step S06, when the inner diameters of the TX coil and the RX coil are equal, the coupling coefficient is the highest, and the inner diameter of the RX coil is smaller than or 1 time larger than the inner diameter of the TX coil, the instantaneous output voltage will be much larger than that of the other cases, and if no voltage stabilization is performed, the RX coil is easily burned out. Find the area range of the coil with small instantaneous output voltage, thus replacing the voltage stabilizing chip of the Rx circuit and reducing the efficiency loss of the system.
In step S07, the area of the RX coil exceeding the area of the TX magnetic shielding sheet may cause magnetic leakage, and the electromagnetic interference may increase.
Example 1
Firstly, research personnel measure the size of a TX coil by using a wireless energy transmission system and measure the impedance value of the TX coil by using a vector network analyzer. Then, the programmer writes programs into the TX coil and the RX coil through the 2.4G Bluetooth communication chip, and the specification of the RX coil and the specification of the TX coil are basically consistent through measurement of a wireless energy transmission system. At this time, a predetermined operating frequency and a predetermined duty ratio are set by the STM chip using an upper computer program. A predetermined voltage value is input to the TX coil through a power supply, and a current limit value is set. And the RX coil is connected with an upper load instrument, and the resistance value corresponding to the requirement is adjusted.
The dimensional parameters of the number of turns and the inner diameter of the RX coil are then first slowly changed by MAXWELL 3D simulation software. Then, the coupling coefficient between the coils and the inductance value of the coils are obtained through simulation. Before that, the risk indication of the wireless energy transmission system can be obtained when the inner diameter of the RX coil is smaller than or more than 1 time of the inner diameter of the TX and the area of the RX coil is larger than that of the TX magnetism-isolating sheet. The RX coil specification needs to be changed again.
And calculating a corresponding capacitance value through an LC resonance calculator, inputting a relevant numerical value through Multisim circuit simulation software, and after simulation, judging whether the preset output voltage is reached and whether the efficiency of the wireless energy transmission system exceeds a specific numerical value, if not, returning to 3D simulation software to change the specification of the RX coil again. If the result is reached, the wireless energy transmission system adjusts the specification of the RX coil in actual test to be consistent with the specification of the RX coil in simulation software, and the capacitance values of the TX coil and the RX coil are improved. And actually testing to see whether the output voltage and the efficiency are consistent with the simulation result, if the actual output voltage and the efficiency are within the allowable error range, successfully researching and developing, and if the actual output voltage and the efficiency are beyond the allowable error range, returning to the 3D simulation software to perform fine adjustment of the RX coil specification. Finally, the RX coil which can meet the requirements of output voltage and efficiency is obtained.
Claims (9)
1. A wireless power transmission method of an adaptive variable receiving coil comprises the following steps: step S01: determining TX coil specifications, including dimensions and impedance values; step S02: the method comprises the steps that a wireless communication module of a wireless energy transmission system through an electromagnetic field enables an RX coil and a TX coil to be consistent; step S03: setting the working frequency and duty ratio of a TX coil and an RX coil; step S04: the TX coil is connected with a set input voltage, a current limit value is set, the wireless energy transmission system works, and the RX coil is connected with a load of the wireless energy transmission system of an electromagnetic field and is adjusted to a corresponding resistance value; step S05: changing the number of turns of the RX coil and the size parameter of the inner diameter, and then simulating to obtain the coupling coefficient between the coils and the inductance value of the coil; step S06: the wireless energy transmission system of the electromagnetic field determines that the inner diameter of the RX coil is equal to or larger than the inner diameter of the TX coil and the inner diameter of the RX coil is smaller than 1 time of the inner diameter of the TX coil; if one of the two conditions is not satisfied, the process returns to step S05; step S07: the wireless energy transmission system of the electromagnetic field determines whether the area of the RX coil is smaller than the area of the magnetic shield sheet of the TX, if it exceeds the area, returns to step S05; step S08: the wireless energy transmission system of the electromagnetic field obtains the coupling coefficient between the coils and the inductance value of the coils, and the corresponding capacitance value is calculated through the LC resonance calculator; step S09: the wireless energy transmission system of the electromagnetic field calculates a TX coil circuit and an RX coil circuit, and input voltage, frequency, capacitance value, TX coil inductance value, RX coil inductance value and coupling coefficient of the coil in the input circuit; step S10: the wireless energy transfer system of the electromagnetic field determines whether a given RX output voltage is reached, and/or whether the system efficiency exceeds a certain value, if not, returns to step S05; step S11: the wireless energy transmission system of the electromagnetic field changes the number of turns and the size parameters of the RX coil and the inductance values of the TX coil and the RX coil in real time according to the evaluation result, measures the actual system efficiency and determines whether the output voltage value is consistent with the evaluation result or within an allowable error range, and if the actual system efficiency and the output voltage value are not consistent with the evaluation result, returns to the step S05 to finely adjust the specification of the RX coil; step S12: 12. an RX coil is obtained that meets the output voltage and efficiency requirements.
2. The method of claim 1, wherein: in step S01, the impedance value is measured using a vector network analyzer.
3. The method of claim 1, wherein: the wireless communication module is one of Bluetooth, Wi-Fi, cellular network, NFC, RFID and NB-IOT.
4. The method of claim 1, wherein: in step S03, a predetermined operating frequency and a predetermined duty ratio are set by the STM chip.
5. The method of claim 1, wherein: the simulation described in step S05 is MAXWELL 3D simulation software.
6. The method of claim 5, wherein: in step S08, the number of turns of the RX coil and the size parameter of the inner diameter are slowly changed by MAXWELL 3D simulation software, and the coupling coefficient between the coils and the inductance value of the coil are obtained through simulation.
7. The method of claim 5, wherein: in step S09, the input voltage, frequency, capacitance value, TX coil inductance value, RX coil inductance value, and coupling coefficient of the coil in the circuit are input by Multisim circuit simulation software.
8. The method of claim 1 or 5 or 6 or 7, wherein: in step S10, it is determined through simulation whether the predetermined output voltage is reached and the system efficiency exceeds a specific value.
9. The method of claim 1 or 5 or 6 or 7, wherein: in step S11, the evaluation result is a simulation result.
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| US11500489B2 (en) | 2019-01-30 | 2022-11-15 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Flexible circuit board and manufacturing method, display device, circuit board structure and display panel thereof |
| CN111511109B (en) | 2019-01-30 | 2021-11-23 | 京东方科技集团股份有限公司 | Flexible circuit board and manufacturing method thereof, electronic device module and electronic device |
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| US10523276B2 (en) * | 2011-08-16 | 2019-12-31 | Qualcomm Incorporated | Wireless power receiver with multiple receiver coils |
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