CN104716747A - Wireless charging system and control method thereof - Google Patents
Wireless charging system and control method thereof Download PDFInfo
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- CN104716747A CN104716747A CN201310683031.7A CN201310683031A CN104716747A CN 104716747 A CN104716747 A CN 104716747A CN 201310683031 A CN201310683031 A CN 201310683031A CN 104716747 A CN104716747 A CN 104716747A
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Abstract
The invention provides a wireless charging system and a control method thereof. The control method mainly comprises the steps that impedance matching is carried out on antennas at first, resonance frequency points of the system are made to fall into an operation frequency range, then optimum frequency point tracking is carried out, a testing signal is transmitted at a set transmitting frequency, the transmission efficiency is computed, then whether the transmission efficiency meets requirements or not is judged, the transmitting frequency is set again and a testing signal is transmitted again if the transmission efficiency does not meet the requirements until the transmission efficiency meets the requirement, and therefore the transmitting frequency is set as the optimum frequency point. By the adoption of the technology, the wireless charging system and the control method thereof have the robustness for changing transmission distance, and then can effectively improve wireless charging efficiency.
Description
Technical field
The invention relates to a kind of wireless charging system and control method thereof, espespecially a kind of correlation technique that effectively can promote wireless charging efficiency.
Background technology
So-called wireless charging charges also referred to as non-contact inductive, mainly sends energy to power consumption equipment by charger by inductance coupling high, and namely power consumption equipment charges to battery after receiving energy; When charger and power consumption equipment distant, namely resonance inductor Coupling Design must be adopted.Owing to being utilize near field induction mode to transmit energy between charger and power consumption equipment, power line need not being used therebetween to connect, therefore there is the plurality of advantages such as safe, durable and convenient.
As described above, be adopt resonance inductor Coupling Design when charger and power consumption equipment distant, it means that charger and power consumption equipment have identical operational frequency range.Figure 10 is the efficiency of transmission of a charger and the homologous thread figure of frequency of operation, refers to shown in Figure 10, and this charger has two resonance frequency point ω
1, ω
2, it determined by the electric capacity in radiating circuit and inductance element respectively:
And above-mentioned the arbitrary of two resonance frequency points drops in operational frequency range, this resonance frequency point is optimum frequency point.But when transmission range changes, resonance frequency point may be run out of in the operational frequency range of allowing, and cannot reach high-efficiency transfer.Figure 11 is the relative nature curve chart of efficiency of transmission and transmission range, and as shown in figure 11, it is 18 centimeters of places that its display optimum transport efficiency drops on transmission range, becomes large or diminishes, all make efficiency of transmission relatively drop when transmission range.
Therefore how to guarantee that optimum frequency point can not run out of the operational frequency range of allowing, to become in wireless charging technology an important problem.And a kind of feasible adjustment technology is impedance matching, existing impedance match technique is roughly divided into two kinds: the parameter adding impedance matching circuit and Modulating Power amplifier, to reach impedance matching.
The mode adding impedance matching circuit is as shown in figure 12, mainly on the coupled antenna 70 of wireless charging system, add impedance matching circuit 80, wherein, in impedance matching circuit 80, set control capacittance Cs, the capacitance of Cp and/or the inductance value of inductance L s are adjustable, according to above-mentioned formula, the capacitance of coupled antenna 70 entirety or electric induction value are once change, and its resonance frequency also can change, adjustable resonance frequency by this, makes it drop in operational frequency range.
But add impedance matching circuit and deposit shortcoming in realization, comprising: not easily reach the slow and sacrificial section system effectiveness of Accuracy Matching, matching speed etc.Mode as Modulating Power amplifier parameter also has the shortcoming not easily reaching Accuracy Matching, and owing to relating to complicated calculation program, also has the problem that matching speed is slow.
From the above, existing utilize impedance match technique guarantee the mode of optimum frequency point exist in realization coupling not easily precisely, speed is slow, the even problem such as sacrificial system efficiency, therefore to need to be further reviewed, and seek feasible solution.
Summary of the invention
Therefore main purpose of the present invention is providing a kind of wireless charging system and the control method thereof that promote efficiency of transmission, it has effectively integrated impedance matching and frequency tracking techniques, to guarantee that optimum frequency point drops in the operational frequency range of allowing, and then realize the high-efficiency transfer of wireless charging.
The technical way taked for reaching aforementioned object makes the control method of aforementioned wireless charging system comprise:
Impedance matching is carried out to antenna, makes the resonance frequency of system point drop in an operational frequency range;
Carry out optimum frequency point tracking, be first transmit test signal with the tranmitting frequency of a setting, and calculate its efficiency of transmission;
Judge whether efficiency of transmission meets the requirements, if undesirable, repeat abovementioned steps until efficiency of transmission meets set point;
If efficiency of transmission meets the requirements, be set as optimum frequency point by this tranmitting frequency;
Charge using this optimum frequency point as system operating frequency.
The another technical way taked for reaching aforementioned object makes aforementioned wireless charging system comprise:
One radio transmitter, has one first controller and a transfer circuit; This transfer circuit comprises one first impedance matching unit and a delivery unit, controls the electric capacity that the first impedance matching unit adds delivery unit, to carry out impedance matching by the first controller; This first controller performs an optimum frequency point tracking program further;
One wireless receiver, has a second controller and a receiving circuit; This receiving circuit comprises a receiving element and one second impedance matching unit, controls the electric capacity that the second impedance matching unit adds receiving element, to carry out impedance matching by second controller; This second controller performs an optimum frequency point tracking program further;
Aforementioned system and control method mainly first carry out impedance matching to antenna, the resonance frequency of system point is made to drop in an operational frequency range of allowing, then optimum frequency point tracking program is carried out, first transmit test signal with the tranmitting frequency of a setting, and calculate its efficiency of transmission, then judge whether its efficiency of transmission meets the requirements, namely reset tranmitting frequency if undesirable and transmit test signal, until efficiency of transmission meets the requirements, be set as optimum frequency point by this tranmitting frequency; Utilize above-mentioned technology to be easier to realize by making the setting of optimum frequency point, and to the transmission range of variation, there is robustness in specific range, and then can effectively promote wireless charging efficiency.
Accompanying drawing explanation
Fig. 1 is the system block diagrams of wireless charging system one of the present invention preferred embodiment;
Fig. 2 is the circuit diagram of the transfer circuit of wireless charging system one of the present invention preferred embodiment;
Fig. 3 is the circuit diagram of the receiving circuit of wireless charging system one of the present invention preferred embodiment;
Fig. 4 is the impedance matching methods flow chart of wireless charging system of the present invention;
Fig. 5 is an optimum frequency point tracking method flow diagram of wireless charging system of the present invention;
Fig. 6 is wireless charging system of the present invention another optimum frequency point tracking method flow diagram;
Fig. 7 is the performance diagram of wireless charging system of the present invention;
Fig. 8 is the charging flow figure of wireless charging system of the present invention;
Fig. 9 is the system block diagrams of the another preferred embodiment of wireless charging system of the present invention;
Figure 10 is the homologous thread figure of existing charger efficiency of transmission and frequency of operation;
Figure 11 is existing charger efficiency of transmission and the homologous thread figure passing distance;
Figure 12 is the circuit diagram of the impedance matching circuit of existing charger.
Reference numeral
10 radio transmitter 11 transfer circuits
111 first impedance matching unit 112 delivery units
12 first controller 13 first power transfer module
131 DC-AC converter 132 amplifiers
20 wireless receiver 21 receiving circuits
211 second impedance matching unit 212 receiving elements
22 second controller 23 second source modular converters
231 rectifier 232 DC-DC converters
70 coupled antenna 80 impedance matching circuits
Embodiment
About a possible embodiments of wireless charging system of the present invention, refer to shown in Fig. 1, it comprises radio transmitter 10 and a wireless receiver 20; Wherein
This radio transmitter 10 is mainly made up of transfer circuit 11,1 first controller 12,1 first power transfer module 13; Refer to shown in Fig. 2, this transfer circuit 11 comprises one first impedance matching unit 111 and a delivery unit 112; This delivery unit 112 comprise a fixed capacity C1, an induction coil L1 and a resistance R1, this fixed capacity C1, this induction coil L1 with serial connection or and the mode that connects is formed loop (the present embodiment is for serial connection), and this resistance R1 is internal resistance; This first impedance matching unit 111 is connected in series or is connected on the loop of delivery unit 112; This first impedance matching unit 111 can the capacitor array that forms of the variable capacitance of modulation or the parallel connection of multiple control capacittance continuously by one.In the present embodiment, this first impedance matching unit 111 is that the capacitor array be made up of multiple control capacittance Cs parallel connection is formed, but is not limited to this.Each control capacittance Cs in aforementioned capacitor array and be connected in series a switch S 1 respectively, each switch S 1 controls its break-make by the first controller 12, that is be determine that the first impedance matching unit 111 adds the loop of delivery unit 112 by the control capacittance Cs of how many parallel connections by the first controller 12.
Formula according to following:
Wherein, L
mfor the mutual inductance inductance produced after induction coil L1 coupling, C '=C1+Cs.
It can thus be appreciated that the total capacitance value C ' of delivery unit 112 can change because the control capacittance Cs of the first impedance matching unit 111 adds entry loop, thus changes its resonance frequency point.That this operational frequency range has specific scope, as can be 140.91KHz ~ 148.5KHz, but is not limited to this in order to allow the resonance frequency of transfer circuit 11 point fall in an operational frequency range of allowing as above-mentioned impedance matching action.
And in the present embodiment, this first power transfer module 13 is that an interchange turns DC form, mainly be made up of a DC-AC converter 131 and an amplifier 132, this DC-AC converter 131 has an input and an output, its input is connected with electric main, its output is then connected with the input of amplifier 132, and the output of amplifier 132 is then connected with the input of transfer circuit 11.
Again please refer to shown in Fig. 1, Fig. 3, this wireless receiver 20 is mainly made up of receiving circuit 21, second controller 22, second source modular converter 23; Refer to shown in Fig. 3, this receiving circuit 21 comprises one second impedance matching unit 211 and a receiving element 212; This receiving element 212 comprise a fixed capacity C2, an induction coil L2 and a resistance R2, this fixed capacity C2, this induction coil L2 with serial connection or and the mode that connects is formed loop (the present embodiment is for serial connection), and this resistance R2 is internal resistance; This second impedance matching unit 211 is connected in series or is connected on the loop of receiving element 212; The capacitor array that this second impedance matching unit 211 still can be made up of multiple control capacittance Cs parallel connection or one can the variable capacitance of modulation continuously be formed, in the present embodiment, this second impedance matching unit 211 is the capacitor arrays be made up of multiple control capacittance Cs parallel connection, but is not limited to this.Each control capacittance Cs in aforementioned capacitor array and be connected in series a switch S 2 respectively, each switch S 2 determines that the second impedance matching unit 211 adds the loop of receiving element 212 by how many control capacittance Cs in parallel by second controller 22.
Because radio transmitter 10 and wireless receiver 20 take resonant design, therefore wireless receiver 20 and radio transmitter 10 take same impedance matching way, to obtain identical resonance frequency point.In theory, transfer circuit 11 makes the first impedance matching unit 111 add how many control capacittance Cs on the loop of delivery unit 112, and receiving circuit 21 just makes its second impedance matching unit 211 add how many control capacittance Cs on the loop of receiving element 212.
In the present embodiment, the second source modular converter 23 of wireless receiver 20 is the DC mode that always circulate, and is mainly made up of a rectifier 231 and a DC-DC converter 232.
The basic framework of wireless charging system of the present invention can be understood by above-mentioned explanation, first controller 12 of this radio transmitter 10 and the second controller 22 of wireless receiver 20 except controlling the first impedance matching unit 111, second impedance matching unit 211 pairs of delivery units 112 respectively, receiving element 212 performs except impedance matching, and carry out an optimum frequency point tracking program respectively further, make wireless charging system be able to carry out high-efficiency transfer at this optimum frequency point.The idiographic flow of impedance matching and tracking optimum frequency point is performed as described below about the first controller 12, second controller 22.
Refer to shown in Fig. 4, perform following steps about impedance matching portion:
Transmit a test signal, and measure electric current, the voltage (401) of delivery unit 112 and receiving element 212;
Calculate its efficiency of transmission (402);
The electric capacity (403) carrying out adding needed for impedance matching is determined according to the efficiency of transmission calculating gained; Specifically determine the control capacittance Cs added on delivery unit 112, receiving element 212 loop, be set up one efficiency of transmission/transmission range table of comparisons in advance in the present embodiment, obtain the control capacittance Cs adding delivery unit 112, receiving element 212 with lookup table mode;
Add this variable capacitance to carry out impedance matching (404), mainly on the loop of delivery unit 112, receiving element 212, add this control capacittance Cs, to carry out impedance matching, and then make the resonance frequency of system point drop in an operational frequency range of allowing, this operational frequency range has specific scope, such as 140.91KHz ~ 148.5KHz, but be not limited to this.
After the resonance frequency point of control system drops on operational frequency range, namely carry out optimum frequency point tracking further, idiographic flow refers to shown in Fig. 5, and it comprises:
Set an initial tranmitting frequency (501);
A test signal (502) is transmitted with the tranmitting frequency of setting;
Calculate its efficiency of transmission (503);
Judge whether efficiency of transmission meets the requirements (504);
If undesirable, namely repeat abovementioned steps (501) ~ (504);
If judge, this efficiency of transmission meets the requirements, and is set as optimum frequency point (505) by this tranmitting frequency;
Carry out charge (506) using this optimum frequency point as system operating frequency; Wherein:
Abovementioned steps (504) judges that the whether satisfactory feasible pattern of efficiency of transmission judges whether the ratio of its efficiency change Δ η and frequency change Δ f is less than or equal to zero; If ratio is greater than zero, namely in the tranmitting frequency of former setting, a cumulative frequency values (such as increases 0.5KH
z), get back to that step (501) resets tranmitting frequency immediately, the test signal that retransfers (502), recalculate its efficiency of transmission (503), and whether the ratio rejudging its efficiency change Δ η and frequency change Δ f is less than or equal to zero (504); When this ratio is less than or equal to zero, be set as optimum frequency point (505) by this tranmitting frequency, and charge as system operating frequency.
Foregoing schemes first sets lower tranmitting frequency, more upwards cumulative frequency to follow the trail of optimum frequency point.In like manner, the present invention also can first set higher tranmitting frequency, then decreasing frequency is to follow the trail of optimum frequency point downwards, and idiographic flow refers to shown in Fig. 6, and it comprises:
Set an initial tranmitting frequency (601);
A test signal (602) is transmitted with the tranmitting frequency of setting;
Calculate its efficiency of transmission (603);
Judge whether efficiency of transmission meets the requirements (604);
If undesirable, namely repeat abovementioned steps (601) ~ (604);
If judge, this efficiency of transmission meets the requirements, and is set as optimum frequency point (605) by this tranmitting frequency;
Carry out charge (606) using this optimum frequency point as system operating frequency.
Step (601) ~ (606) of above-mentioned Fig. 6 are roughly the same with step (501) ~ (506) of Fig. 5, difference is in step (601) and (604), and wherein step (601) is the tranmitting frequency of setting upper frequency.Step (604) judges whether the ratio of its efficiency change Δ η and frequency change Δ f is more than or equal to zero; If ratio is less than zero, namely successively decrease a frequency values (such as reducing 0.5KHZ) in the tranmitting frequency of former setting, get back to that step (601) resets tranmitting frequency immediately, the test signal that retransfers (602), recalculate its efficiency of transmission (603), and whether the ratio rejudging its efficiency change Δ η and frequency change Δ f is more than or equal to zero (604); When this ratio is more than or equal to zero, be set as optimum frequency point (605) by this tranmitting frequency, and carry out charge (606) as system operating frequency using this optimum frequency point.
Utilize above-mentioned technology, wireless charging system of the present invention can sequentially complete impedance matching, optimum frequency point tracking before charging, makes system resonance in particular frequency range, has robustness, to realize high-efficiency transfer for transmission range variation.Refer to the performance diagram of efficiency of transmission to transmission range of Fig. 7, after integration impedance matching and optimum frequency point tracking technology, high-transmission efficiency (as curve J1) can be kept under multiple different transmission range (such as 12,14,16,18 centimeters), even if along with transmission range expand and efficiency of transmission is reduced, its efficiency of transmission also comparatively prior art (as curve J2) be height.
When preceding method is applied in actual wireless charging program, can according to flow performing shown in Fig. 8, it comprises:
Judge whether to receive a charge request (801);
If receive charge request, namely perform a precharge mode (802), and under this precharge mode, complete aforesaid impedance matching and optimum frequency point tracking;
After precharge mode terminates, enter a charge mode (803) charge;
Continue to have judged whether closing motion (shut down) (804) or emergency (805) under charge mode, if there is wherein a kind of situation and complete charge program (806).
Moreover the wireless charging system of previous embodiment, the first power transfer module 13 of its radio transmitter 10, wireless receiver 20, second source modular converter 23 exchange DC mode.In fact the present invention also can be used in and exchange AC mode, refer to shown in Fig. 9, the basic framework of this radio transmitter 10, wireless receiver 20 is roughly the same with previous embodiment, the first power transfer module 13 that difference is in: this radio transmitter 10 exchanges by one formed a-c transducer, its input is connected with electric main, and output is directly connected with the input of transfer circuit 11.
The second source modular converter 23 of this wireless receiver 20 is made up of an active rectifier.By this, form a direct alternating current transmission system between this radio transmitter 10 and wireless receiver 20, not only system architecture is simple for it, and can reduce electric power conversion loss, improves system effectiveness further.
Claims (10)
1. a control method for wireless charging system, is characterized in that, described control method comprises:
Impedance matching is carried out to antenna, makes the resonance frequency of wireless charging system point drop in an operational frequency range;
Carry out optimum frequency point tracking, first transmit test signal with the tranmitting frequency of a setting, and calculate its efficiency of transmission;
Judge whether efficiency of transmission meets the requirements, if undesirable, repeat above-mentioned steps until efficiency of transmission meets set point;
If efficiency of transmission meets the requirements, described tranmitting frequency is set as optimum frequency point;
Charge using described optimum frequency point as system operating frequency.
2. the control method of wireless charging system according to claim 1, is characterized in that, describedly carries out impedance matching to antenna and comprises the following steps:
Transmit a test signal;
Calculate the efficiency of transmission of described test signal;
The variable capacitance added needed for impedance matching is determined according to the efficiency of transmission calculating gained;
Add described variable capacitance to carry out impedance matching, the resonance frequency of wireless charging system point is dropped in an operational frequency range.
3. the control method of wireless charging system according to claim 2, is characterized in that, the value of described variable capacitance is obtained with lookup table mode by the efficiency of transmission set up an in advance/transmission range table of comparisons.
4. the control method of the wireless charging system according to claim arbitrary in claims 1 to 3, is characterized in that, when carrying out optimum frequency point tracking, determines whether efficiency of transmission meets the requirements by following steps:
Judge whether the ratio of its efficiency change and frequency change is less than or equal to zero; If ratio is greater than zero, an i.e. cumulative frequency values in the tranmitting frequency of former setting, reset tranmitting frequency, transmit test signal, calculate the efficiency of transmission of described test signal immediately, and whether the ratio rejudging its efficiency change and frequency change is less than or equal to zero;
When described ratio is less than or equal to zero, be set as optimum frequency point by described tranmitting frequency.
5. the control method of the wireless charging system according to claim arbitrary in claims 1 to 3, is characterized in that, when carrying out optimum frequency point tracking, determines whether efficiency of transmission meets the requirements by following steps:
Judge whether the ratio of its efficiency change and frequency change is more than or equal to zero; If ratio is less than zero, namely successively decrease a frequency values in the tranmitting frequency of former setting, reset tranmitting frequency, transmit test signal, calculate the efficiency of transmission of described test signal immediately, and whether the ratio rejudging its efficiency change and frequency change is more than or equal to zero;
When described ratio is more than or equal to zero, be set as optimum frequency point by described tranmitting frequency.
6. a wireless charging system, is characterized in that, described wireless charging system comprises:
One radio transmitter, has one first controller and a transfer circuit; Described transfer circuit comprises one first impedance matching unit and a delivery unit, controls the electric capacity that the first impedance matching unit adds delivery unit, to carry out impedance matching by the first controller; Described first controller performs an optimum frequency point tracking program further;
One wireless receiver, has a second controller and a receiving circuit; Described receiving circuit comprises a receiving element and one second impedance matching unit, controls the electric capacity that the second impedance matching unit adds receiving element, to carry out impedance matching by second controller; Described second controller performs an optimum frequency point tracking program further.
7. wireless charging system according to claim 6, is characterized in that, the delivery unit of transfer circuit is interconnected to form primary Ioops primarily of a fixed capacity, an induction coil; Described first impedance matching unit is connected on the loop of delivery unit;
Described receiving element is interconnected to form primary Ioops primarily of a fixed capacity, an induction coil; Described second impedance matching unit is connected on the loop of receiving element;
Described first impedance matching unit, the second impedance matching unit are made up of the variable capacitance of a continuous modulation respectively.
8. wireless charging system according to claim 6, is characterized in that, the delivery unit of described transfer circuit is interconnected to form primary Ioops primarily of a fixed capacity, an induction coil; Described first impedance matching unit is connected on the loop of delivery unit;
Described receiving element is interconnected to form primary Ioops primarily of a fixed capacity, an induction coil; Described second impedance matching unit is connected on the loop of receiving element;
The capacitor array that described first impedance matching unit is formed primarily of multiple control capacittance parallel connection formed, and in described capacitor array, each control capacittance is connected in series a switch respectively, and each switch is controlled to open and close by the first controller;
The capacitor array that described second impedance matching unit is formed primarily of multiple control capacittance parallel connection formed, and in described capacitor array, each control capacittance is connected in series a switch respectively, and each switch is controlled to open and close by second controller.
9. the wireless charging system according to claim arbitrary in claim 6 to 8, is characterized in that, described optimum frequency point tracking program comprises:
First transmit test signal with the tranmitting frequency of a setting, and calculate the efficiency of transmission of described test signal;
Judge whether efficiency of transmission meets the requirements, if undesirable, repeat above-mentioned steps until efficiency of transmission meets set point;
If efficiency of transmission meets the requirements, described tranmitting frequency is set as optimum frequency point.
10. wireless charging system according to claim 9, is characterized in that, described radio transmitter comprises one first power transfer module further, and described first power transfer module is connected with transfer circuit;
Described wireless receiver comprises a second source modular converter further, and described second source modular converter is connected with receiving circuit.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391185A (en) * | 2015-07-14 | 2016-03-09 | 苏州华昌机电有限公司 | Wireless charger |
| CN105406564A (en) * | 2015-11-30 | 2016-03-16 | 小米科技有限责任公司 | Wireless charging method, device and system |
| CN106787247A (en) * | 2017-01-13 | 2017-05-31 | 北京空间飞行器总体设计部 | A kind of wireless energy transmission efficiency test system |
| CN108321552A (en) * | 2017-01-17 | 2018-07-24 | 台达电子工业股份有限公司 | Radio frequency energy-transfer device, radio frequency energy hunting device and its radio frequency pass can method |
| CN111366782A (en) * | 2019-12-11 | 2020-07-03 | 横店集团东磁股份有限公司 | High-frequency wireless charging efficiency and loss test system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714429B (en) * | 2010-01-18 | 2015-02-25 | 丰田自动车株式会社 | Noncontact power-receiving device, noncontact power-transmitting device, noncontact power-feeding system, and vehicle |
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2013
- 2013-12-12 CN CN201310683031.7A patent/CN104716747B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391185A (en) * | 2015-07-14 | 2016-03-09 | 苏州华昌机电有限公司 | Wireless charger |
| CN105406564A (en) * | 2015-11-30 | 2016-03-16 | 小米科技有限责任公司 | Wireless charging method, device and system |
| CN106787247A (en) * | 2017-01-13 | 2017-05-31 | 北京空间飞行器总体设计部 | A kind of wireless energy transmission efficiency test system |
| CN106787247B (en) * | 2017-01-13 | 2019-02-15 | 北京空间飞行器总体设计部 | A kind of wireless energy transmission efficiency test macro |
| CN108321552A (en) * | 2017-01-17 | 2018-07-24 | 台达电子工业股份有限公司 | Radio frequency energy-transfer device, radio frequency energy hunting device and its radio frequency pass can method |
| CN108321552B (en) * | 2017-01-17 | 2020-09-22 | 台达电子工业股份有限公司 | Radio frequency energy transmission device, radio frequency energy hunting device and radio frequency energy transmission method thereof |
| CN111366782A (en) * | 2019-12-11 | 2020-07-03 | 横店集团东磁股份有限公司 | High-frequency wireless charging efficiency and loss test system and method |
| CN111366782B (en) * | 2019-12-11 | 2021-09-17 | 横店集团东磁股份有限公司 | High-frequency wireless charging efficiency and loss test system and method |
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