CN110850189A - Detection circuit and detection method for coupling coefficient of charging coil of wireless charger - Google Patents
Detection circuit and detection method for coupling coefficient of charging coil of wireless charger Download PDFInfo
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- CN110850189A CN110850189A CN201911284605.7A CN201911284605A CN110850189A CN 110850189 A CN110850189 A CN 110850189A CN 201911284605 A CN201911284605 A CN 201911284605A CN 110850189 A CN110850189 A CN 110850189A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2611—Measuring inductance
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Abstract
The invention provides a circuit and a method for detecting the coupling coefficient of a charging coil of a wireless charger, which have the advantages of simple structure, low cost and high test efficiency. The circuit comprises an MCU (1), an LCR meter (2) and a relay module, wherein the MCU (1) is in electric signal connection with the relay module, and two ends of a sending coil (TX) and a receiving coil (RX) are respectively connected with the LCR meter (2); the method comprises the following steps: the relay module is controlled to be switched on and off through the MCU, and inductance values of the transmitting coil or the receiving coil at the moment are read by using the LCR meter (2) and are respectively recorded as Ltx or Lrx; and then adjusting the on-off of the relay module in another form to obtain the inductive reactance value of the sending coil or the receiving coil at the moment, marking as Ltx (short) or Lrx (short), and respectively calculating through a coupling coefficient calculation formula to obtain the value of the coupling coefficient K. The invention is used for the field of wireless charger testing.
Description
Technical Field
The invention relates to the field of wireless charger testing, in particular to a circuit and a method for detecting a coupling coefficient of a charging coil of a wireless charger.
Background
With the development of wireless charging technology, more and more wireless charging products are applied to daily life. Compared with wired charging, wireless charging is generally low in power and low in efficiency. The most important factor affecting the efficiency is the coupling coefficient between the charging coils, and the larger the coupling coefficient is, the higher the charging efficiency is. The coupling coefficient is closely related to the coils and the distances between the coils, and how to rapidly and accurately measure the coupling coefficient between the coils is very important in the design of wireless charging products, which is very important for predicting the charging efficiency and the temperature rise of the products in various occasions. Some tests need to be completed under a specific K value (coupling coefficient), and in practical application, a large amount of time is often needed to find the specific coupling coefficient, namely the K value.
The traditional coil mutual inductance testing method comprises a voltammetry method, a flux method, a series connection method and the like, but the methods can be completed only by matching a plurality of instruments, and the method has the advantages of high measurement cost, large volume, complex operation method and inconvenience for batch production.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the charging coil coupling coefficient detection circuit of the wireless charger, which has the advantages of simple structure, low cost and high test efficiency, and the method for detecting the coupling coefficient of the charging coil of the wireless charger by using the circuit.
The technical scheme adopted by the charging coil coupling coefficient detection circuit of the wireless charger is as follows: in the invention, the charging coil to be tested comprises a sending coil and a receiving coil, and comprises an MCU, an LCR meter and a relay module, wherein the MCU is in electric signal connection with the relay module, two ends of the sending coil and the receiving coil are respectively connected with the LCR meter, the relay module comprises a first relay, a second relay, a third relay, a fourth relay, a fifth relay and a sixth relay, the first relay is arranged on a connecting wire at one end of the sending coil, the second relay is arranged on a connecting wire at the other end of the sending coil, the third relay is connected between two ends of the sending coil, the fourth relay is arranged on a connecting wire at one end of the receiving coil, the fifth relay is arranged on a connecting wire at the other end of the receiving coil, and the sixth relay is connected between two ends of the receiving coil, the transmitting coil and the receiving coil.
Above-mentioned scheme is visible, MCU's setting can carry out intelligent control to the relay module, LCR table can be treated the sending coil and the receiving coil of coil and carry out inductance detection respectively, and directly read the corresponding value, and the setting of relay module can realize the quick and convenient detection of receiving coil and sending coil's inductance, detection efficiency has been promoted greatly, and realize automated control through MCU's control, need not to introduce the influence of human factor to the testing result in view of the above, the precision and the stability of testing result have been guaranteed, staff's intensity of labour has also been reduced, and its simple structure, the cost of manufacture is low, be applicable to extensive automated test.
Furthermore, the circuit also comprises a peripheral host computer, and the host computer is respectively connected with the MCU and the LCR meter through serial ports. Therefore, the automatic control of the MCU and the LCR meter can be realized by the host machine through the setting of the host machine, the automation degree of the whole test is improved, the introduction of human factors is reduced, and the test precision is ensured.
And furthermore, the MCU is connected with the relay module through a GPIO port. Therefore, the MCU and the relay module are connected through the GPIO port, and the stability and the transmission rate of communication are guaranteed.
The method for detecting the coupling coefficient of the charging coil of the wireless charger by using the charging coil coupling coefficient detection circuit of the wireless charger comprises the following steps:
a. closing the first relay and the second relay, opening the third relay, the fourth relay, the fifth relay and the sixth relay, reading the inductive reactance value of the sending coil at the moment through the LCR meter, and recording as Ltx;
b. closing the sixth relay, maintaining the respective states of the first relay, the second relay, the third relay, the fourth relay and the fifth relay, and reading the inductive reactance value of the transmitting coil at the moment through the LCR meter, which is recorded as Ltx (short);
c. according to a formula for calculating coupling coefficient
And obtaining the coupling coefficient K of the coupling coil.
According to the scheme, the method can be used for rapidly detecting the inductive reactance value of the sending coil by controlling the corresponding relay to be switched on or switched off through the MCU according to the requirement, the coupling coefficient can be obtained according to the coupling coefficient calculation formula, the detection process is realized by the MCU, only the detection program needs to be set, the operation is convenient, the introduction of human factors is reduced in the test process, the detection precision is improved, and the test is rapid.
Another method for detecting the coupling coefficient of the charging coil of the wireless charger by using the charging coil coupling coefficient detection circuit of the wireless charger comprises the following steps:
d. closing the fourth relay and the fifth relay, opening the first relay, the second relay, the third relay and the sixth relay, reading the inductive reactance value of the receiving coil at the moment through the LCR meter, and recording as Lrx;
e. closing the third relay, maintaining the respective states of the first relay, the second relay, the fourth relay, the fifth relay and the sixth relay, and reading the inductive reactance value of the receiving coil at the moment through the LCR meter, which is recorded as Lrx (short);
f. according to a formula for calculating coupling coefficient
And obtaining the coupling coefficient K of the coupling coil.
Similarly, according to the scheme, the inductive reactance value of the receiving coil can be quickly detected only by controlling the corresponding relay to be switched on or switched off through the MCU according to requirements, the coupling coefficient can be obtained according to the coupling coefficient calculation formula, the whole detection process is simple, the operation is convenient and fast, the test is quick, and the test precision is high.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, in the present invention, the charging coil to be tested includes a transmitting coil TX and a receiving coil RX. In one embodiment, the transmitting coil TX and the receiving coil RX may be disposed on two relatively movable parts of a machine, and the distance between the transmitting coil TX and the receiving coil RX may be adjustable by relative movement of the two relatively movable parts on the machine. According to the actual number of turns of the coil and the winding density of the coil, the distance between the sending coil TX and the receiving coil RX can be adjusted to be the optimal distance according to the actual situation.
The charging coil coupling coefficient detection circuit of the wireless charger comprises an MCU1, an LCR meter 2, a peripheral host computer 3 and a relay module. The MCU1 is in electrical signal connection with the relay module through a GPIO port. Both ends of the transmitting coil TX and the receiving coil RX are respectively connected to the LCR meter 2. The host 3 is respectively connected with the MCU1 and the LCR meter 2 through serial ports. The relay module comprises a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5 and a sixth relay K6. The first relay K1 is provided on a connection line of one end of the transmission coil TX, the second relay K2 is provided on a connection line of the other end of the transmission coil TX, and the third relay K3 is connected between both ends of the transmission coil TX. The fourth relay K4 is provided on a connection line at one end of the receiving coil RX, the fifth relay K5 is provided on a connection line at the other end of the receiving coil RX, and the sixth relay K6 is connected between both ends of the receiving coil RX, the transmitting coil TX and the receiving coil RX.
As shown in fig. 1, the first relay K1, the second relay K2, the fourth relay K4, and the fifth relay K5 may allow the coils to be completely disconnected from the system, and the third relay K3 and the sixth relay K6 may be used to short-circuit the coils in order to calculate the coupling coefficient K between the two coils. The MCU is used to control the on and off of the first relay K1, the second relay K2, the third relay K3, the fourth relay K4, the fifth relay K5 and the sixth relay K6, and then the inductance of the coils under different conditions is measured by the LCR meter, and the inductance values are recorded, and the coupling coefficient K between the two coils is calculated by the following method.
The first method is as follows:
a. closing the first relay K1 and the second relay K2, opening the third relay K3, the fourth relay K4, the fifth relay K5 and the sixth relay K6, and reading the inductance value of the transmission coil TX at this time by the LCR meter 2, and recording the inductance value as Ltx;
b. closing the sixth relay K6, maintaining the respective states of the first relay K1, the second relay K2, the third relay K3, the fourth relay K4 and the fifth relay K5, and reading the inductance value of the transmission coil TX at this time by the LCR table 2, which is denoted as ltx (short);
c. according to a formula for calculating coupling coefficient
And obtaining the coupling coefficient K of the coupling coil.
The second method is as follows:
d. closing the fourth relay K4 and the fifth relay K5, opening the first relay K1, the second relay K2, the third relay K3 and the sixth relay K6, and reading the inductance value of the receiving coil RX at this time by the LCR meter 2, and recording the inductance value as Lrx;
e. closing the third relay K3, maintaining the respective states of the first relay K1, the second relay K2, the fourth relay K4, the fifth relay K5 and the sixth relay K6, and reading the inductance value of the receiving coil RX at this time by the LCR meter 2, which is denoted as lrx (short);
f. according to a formula for calculating coupling coefficient
To obtain the coupling system of the coupling coilThe number K.
The coupling coefficients measured by the above two methods are identical, i.e.
。
The invention is a set of automatic wireless charger charging coil coupling coefficient measuring scheme based on LCR meter, and has simple usage, low cost and high speed. The coupling coefficient between the coils can be rapidly and accurately measured. Compared with the existing test methods, the method has the advantages of high test precision, low cost and simplicity and rapidness.
Claims (5)
1. A charging coil coupling coefficient detection circuit of wireless charger, the charging coil that awaits measuring includes sending coil (TX) and receiving coil (RX), its characterized in that: the electric signal transmission device comprises an MCU (1), an LCR meter (2) and a relay module, wherein the MCU (1) is in electric signal connection with the relay module, two ends of a transmitting coil (TX) and a receiving coil (RX) are respectively connected with the LCR meter (2), the relay module comprises a first relay (K1), a second relay (K2), a third relay (K3), a fourth relay (K4), a fifth relay (K5) and a sixth relay (K6), the first relay (K1) is arranged on a connecting wire at one end of the transmitting coil (TX), the second relay (K2) is arranged on a connecting wire at the other end of the transmitting coil (TX), the third relay (K3) is connected between two ends of the transmitting coil (TX), and the fourth relay (K4) is arranged on a connecting wire at one end of the receiving coil (RX), the fifth relay (K5) is provided on a connection line of the other end of the receiving coil (RX), and the sixth relay (K6) is connected between both ends of the receiving coil (RX), the transmitting coil (TX) and the receiving coil (RX).
2. The circuit for detecting the coupling coefficient of a charging coil of a wireless charger according to claim 1, wherein: the circuit also comprises a peripheral host (3), wherein the host (3) is respectively in electric signal connection with the MCU (1) and the LCR meter (2) through serial ports.
3. The circuit for detecting the coupling coefficient of a charging coil of a wireless charger according to claim 1, wherein: the MCU (1) is connected with the relay module through a GPIO port.
4. A method for detecting a coupling coefficient of a charging coil of a wireless charger using the charging coil coupling coefficient detecting circuit of the wireless charger according to claim 1, the method comprising the steps of:
a. closing the first relay (K1) and the second relay (K2), opening the third relay (K3), the fourth relay (K4), the fifth relay (K5), and the sixth relay (K6), and reading an inductance value of the transmission coil (TX) at this time as Ltx by the LCR meter (2);
b. closing the sixth relay (K6), maintaining the respective states of the first relay (K1), the second relay (K2), the third relay (K3), the fourth relay (K4), and the fifth relay (K5), and reading the inductance value of the transmission coil (TX) at this time, which is denoted as ltx (short), by the LCR meter (2);
c. according to a formula for calculating coupling coefficient
And obtaining the coupling coefficient K of the coupling coil.
5. A method for detecting a coupling coefficient of a charging coil of a wireless charger using the charging coil coupling coefficient detecting circuit of the wireless charger according to claim 1, the method comprising the steps of:
d. closing the fourth relay (K4) and the fifth relay (K5), opening the first relay (K1), the second relay (K2), the third relay (K3), and the sixth relay (K6), and reading an inductance value of the receiving coil (RX) at this time, which is recorded as Lrx, by the LCR meter (2);
e. closing the third relay (K3), maintaining the respective states of the first relay (K1), the second relay (K2), the fourth relay (K4), the fifth relay (K5) and the sixth relay (K6), and reading the inductance value of the receiving coil (RX) at that time, which is denoted as lrx (short), by the LCR meter (2);
f. according to a formula for calculating coupling coefficient
And obtaining the coupling coefficient K of the coupling coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911284605.7A CN110850189A (en) | 2019-12-13 | 2019-12-13 | Detection circuit and detection method for coupling coefficient of charging coil of wireless charger |
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| CN201911284605.7A CN110850189A (en) | 2019-12-13 | 2019-12-13 | Detection circuit and detection method for coupling coefficient of charging coil of wireless charger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924754A (en) * | 2021-01-20 | 2021-06-08 | 安洁无线科技（苏州）有限公司 | Wireless charging coil coupling test platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924754A (en) * | 2021-01-20 | 2021-06-08 | 安洁无线科技（苏州）有限公司 | Wireless charging coil coupling test platform |
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