阅读说明：本技术 一种最优频率无线能量传递装置制作方法 (Manufacturing method of optimal frequency wireless energy transfer device ) 是由 柯智强 焦海 柯奕 喻金钱 王成英 熊斌海 于 2021-07-27 设计创作，主要内容包括：本发明属于无线能量传输领域,特别涉及一种最优频率无线能量传递装置制作方法。本发明通过测试装置测量最优的工作频率,根据该频率调节滑动电阻的电子值,从而实现最终产品工作在较为合理的频率点。(The invention belongs to the field of wireless energy transmission, and particularly relates to a manufacturing method of an optimal frequency wireless energy transfer device. The invention measures the optimal working frequency through the testing device, and adjusts the electronic value of the sliding resistor according to the frequency, thereby realizing that the final product works at a more reasonable frequency point.)

1. A manufacturing method of an optimal frequency wireless energy transfer device comprises a testing device and the wireless energy transfer device, and is characterized in that: during testing, the anode of a thyristor D of the testing device is connected with a transmitting coil Lf and a transmitting matching capacitor Cf of a circuit to be tested, a waveform generator of the testing device changes different input waveforms according to control signals, meanwhile, a control circuit detects current signals output by a current detection circuit, the control circuit records the numerical values of collected currents under different control signals, and the frequency output by the waveform generator when the measuring resistor Rs generates the maximum current and works is recorded as the maximum current frequency; the wireless energy transfer device comprises a circuit to be tested, an adjustable squarer and a working thyristor DA, wherein the anode of the working thyristor DA is connected with a transmitting coil Lf and a transmitting matching capacitor Cf of the circuit to be tested, and a sliding resistor R2 is adjusted to enable the output frequency of the adjustable squarer to be the maximum current frequency; the testing device comprises a waveform generator, a thyristor D and a current detection circuit, wherein the cathode of the thyristor D is connected with a measurement resistor Rs and then is connected with a power ground, the waveform generator is connected with the grid of the thyristor D, the current detection circuit collects the current of the measurement resistor Rs, a control circuit collects a voltage signal output by the current detection circuit and controls the waveform generator to generate a waveform, the waveform generator comprises a frequency generation chip U1, a crystal oscillator module U2 and a pulse width regulation circuit, the crystal oscillator module U2 is connected with the frequency generation chip U1, a control pin of the frequency generation chip U1 is connected with the control circuit, a control command is output by the control circuit to enable an output end OUT of the frequency generation chip U1 to output different frequencies, an output end OUT of the frequency generation chip U1 is connected with an input of the pulse width regulation circuit, the frequency generation chip U1 is an AD9833 chip, and the pulse width regulation circuit comprises a timer U3, The timer comprises a resistor R, a sliding resistor R1 and a capacitor C5, pins 6 and 7 of a timer U3 are connected into the resistor R and the capacitor C5, a pin 2 is used for starting, a pin 3 is used as a frequency signal output pin, a pin 5 is applied with a voltage V1, the pin 5 is connected with a power supply through a series sliding resistor R1, the timer U3 is a 555 timer, and the capacitor C5 is a 0.1uF capacitor; the current detection circuit comprises a triode, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the first resistor R1 is connected with an emitting electrode of the triode and then grounded, the second resistor R2 is connected with a measuring resistor Rs in parallel and then connected with a base electrode of the triode, one end of the third resistor R3 is connected with a power supply, the other end of the third resistor R3 is connected with the base electrode of the triode, the anode of the diode D1 is connected with the power supply after being connected into a fourth resistor R4, and the cathode of the diode D1 is connected with a collector electrode of the triode.

2. The method of claim 1, wherein the step of forming the optimal frequency wireless energy transfer device comprises: when the maximum current frequency is f, f is 1/T1/{ 0.69(R1+2R2) C1}, the resistor R1 is 2.1K Ω, and the frequency generating capacitor C1 is 0.01 uF.

3. The method of claim 1, wherein the step of forming the optimal frequency wireless energy transfer device comprises: the fourth resistor R4 was 0.1K Ω, the measurement resistor Rs was 0.51 Ω, the second resistor R2 was 7.2K Ω, and the third resistor R3 was 47K Ω.

4. The method of claim 1, wherein the step of forming the optimal frequency wireless energy transfer device comprises: the circuit to be tested of the wireless energy transfer device comprises a transmitting coil Lf, a transmitting matching capacitor Cf, a receiving coil Lj, a receiving matching capacitor Cj, a boosting circuit and an energy storage circuit, wherein the cathode of a working thyristor DA is connected with a power ground, the receiving coil Lj and the receiving matching capacitor Cj are connected in parallel and then connected with the boosting circuit, the boosting circuit is connected with the energy storage circuit, and an adjustable square wave filter is connected with the grid electrode of the working thyristor DA.

5. The method of claim 1, wherein the step of forming the optimal frequency wireless energy transfer device comprises: the adjustable square wave device comprises a chip UC, a resistor R1, a sliding resistor R2, a frequency generating capacitor C1 and a capacitor C2, wherein the chip UC is an NE555 chip, a VCC pin and a RST pin of the chip UC are connected with a power supply, the resistor R1 is connected between the power supply and a DIG pin, the sliding resistor R2 is connected between the DIG pin and a TRI pin, the TRI pin and a THR pin are in short circuit, the frequency generating capacitor C1 is connected between the TRI pin and the ground, the capacitor C2 is connected between a CON pin and the ground, and UT is square wave signal output; the boosting circuit comprises a field effect transistor UA, a boosting inductor LS, a boosting capacitor CS and a diode DS, wherein the boosting inductor LS is connected with the drain electrode and the grid electrode G of the field effect transistor UA, the boosting capacitor CS and the diode DS are connected with the boosting inductor LS and a power ground after being connected in series, and the source electrode S of the field effect transistor UA is connected with the energy storage circuit; when the voltage is too low, the field effect tube UA is turned off, an input signal stores energy for the boost inductor LS, when the voltage is suitable for charging, the field effect tube UA is turned on, and the input signal and the boost inductor LS provide energy for a load together; the energy storage circuit is a super farad capacitor CA or a chemical battery DA.

Technical Field

The invention belongs to the field of wireless energy transmission, and particularly relates to a manufacturing method of an optimal frequency wireless energy transfer device.

Background

Magnetic resonance is an efficient way of transferring energy, and two of the most basic conditions are satisfied, where the transmit coil and the receive coil have the same resonance frequency, and the transmit frequency of the transmit coil is at the resonance frequency of the coil. The two basic conditions are not satisfied, and the energy transmission has no practicability basically.

Because the matching capacitors of different batches and the same specification and model have 5% of errors, the errors of the transmitting coil reach 10% more, the resonance frequency of the coils of different manufacturers of different batches is greatly deviated, the fixed driving frequency of the coil deviates from the inherent resonance frequency point of the coil, and the frequency is asynchronous. Even if the same batch of the energy transfer system is used, different products have certain errors, and the energy transfer efficiency is influenced.

How to operate the wireless energy transfer device at a reasonable frequency in a simple and effective manner is the focus of research by those skilled in the art.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a manufacturing method of an optimal frequency wireless energy transfer device. The invention measures the optimal working frequency through the testing device, and adjusts the electronic value of the sliding resistor according to the frequency, thereby realizing that the final product works at a more reasonable frequency point.

The technical scheme of the invention is as follows: a manufacturing method of an optimal frequency wireless energy transfer device comprises a testing device and the wireless energy transfer device, and is characterized in that: during testing, the anode of a thyristor D of the testing device is connected with a transmitting coil Lf and a transmitting matching capacitor Cf of a circuit to be tested, a waveform generator of the testing device changes different input waveforms according to control signals, meanwhile, a control circuit detects current signals output by a current detection circuit, the control circuit records the numerical values of collected currents under different control signals, and the frequency output by the waveform generator when the measuring resistor Rs generates the maximum current and works is recorded as the maximum current frequency; the wireless energy transfer device comprises a circuit to be tested, an adjustable squarer and a working thyristor DA, wherein the anode of the working thyristor DA is connected with a transmitting coil Lf and a transmitting matching capacitor Cf of the circuit to be tested, and a sliding resistor R2 is adjusted to enable the output frequency of the adjustable squarer to be the maximum current frequency; the testing device comprises a waveform generator, a thyristor D and a current detection circuit, wherein the cathode of the thyristor D is connected with a measurement resistor Rs and then is connected with a power ground, the waveform generator is connected with the grid of the thyristor D, the current detection circuit collects the current of the measurement resistor Rs, a control circuit collects a voltage signal output by the current detection circuit and controls the waveform generator to generate a waveform, the waveform generator comprises a frequency generation chip U1, a crystal oscillator module U2 and a pulse width regulation circuit, the crystal oscillator module U2 is connected with the frequency generation chip U1, a control pin of the frequency generation chip U1 is connected with the control circuit, a control command is output by the control circuit to enable an output end OUT of the frequency generation chip U1 to output different frequencies, an output end OUT of the frequency generation chip U1 is connected with an input of the pulse width regulation circuit, the frequency generation chip U1 is an AD9833 chip, and the pulse width regulation circuit comprises a timer U3, The timer comprises a resistor R, a sliding resistor R1 and a capacitor C5, pins 6 and 7 of a timer U3 are connected into the resistor R and the capacitor C5, a pin 2 is used for starting, a pin 3 is used as a frequency signal output pin, a pin 5 is applied with a voltage V1, the pin 5 is connected with a power supply through a series sliding resistor R1, the timer U3 is a 555 timer, and the capacitor C5 is a 0.1uF capacitor; the current detection circuit comprises a triode, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the first resistor R1 is connected with an emitting electrode of the triode and then grounded, the second resistor R2 is connected with a measuring resistor Rs in parallel and then connected with a base electrode of the triode, one end of the third resistor R3 is connected with a power supply, the other end of the third resistor R3 is connected with the base electrode of the triode, the anode of the diode D1 is connected with the fourth resistor R4 and then connected with the power supply, and the cathode of the diode D1 is connected with a collector electrode of the triode;

the manufacturing method of the optimal frequency wireless energy transfer device is characterized by comprising the following steps: when the maximum current frequency is f, f is 1/T1/{ 0.69(R1+2R2) C1}, the resistor R1 is 2.1K Ω, and the frequency generating capacitor C1 is 0.01 uF.

The manufacturing method of the optimal frequency wireless energy transfer device is characterized by comprising the following steps: the fourth resistor R4 was 0.1K Ω, the measurement resistor Rs was 0.51 Ω, the second resistor R2 was 7.2K Ω, and the third resistor R3 was 47K Ω.

The manufacturing method of the optimal frequency wireless energy transfer device is characterized by comprising the following steps: the circuit to be tested of the wireless energy transfer device comprises a transmitting coil Lf, a transmitting matching capacitor Cf, a receiving coil Lj, a receiving matching capacitor Cj, a boosting circuit and an energy storage circuit, wherein the cathode of a working thyristor DA is connected with a power ground, the receiving coil Lj and the receiving matching capacitor Cj are connected in parallel and then connected with the boosting circuit, and the boosting circuit is connected with the energy storage circuit. The adjustable square wave filter is connected with the grid of the working thyristor DA,

the manufacturing method of the optimal frequency wireless energy transfer device is characterized by comprising the following steps: the adjustable square wave device comprises a chip UC, a resistor R1, a sliding resistor R2, a frequency generating capacitor C1 and a capacitor C2, wherein the chip UC is an NE555 chip, a VCC pin and a RST pin of the chip UC are connected with a power supply, the resistor R1 is connected between the power supply and a DIG pin, the sliding resistor R2 is connected between the DIG pin and a TRI pin, the TRI pin and a THR pin are in short circuit, the frequency generating capacitor C1 is connected between the TRI pin and the ground, the capacitor C2 is connected between a CON pin and the ground, and UT is square wave signal output; the boosting circuit comprises a field effect transistor UA, a boosting inductor LS, a boosting capacitor CS and a diode DS, wherein the boosting inductor LS is connected with the drain electrode and the grid electrode G of the field effect transistor UA, the boosting capacitor CS and the diode DS are connected with the boosting inductor LS and a power ground after being connected in series, and the source electrode S of the field effect transistor UA is connected with the energy storage circuit; when the voltage is too low, the field effect tube UA is turned off, an input signal stores energy for the boost inductor LS, when the voltage is suitable for charging, the field effect tube UA is turned on, and the input signal and the boost inductor LS provide energy for a load together; the energy storage circuit is a super farad capacitor CA or a chemical battery DA.

The invention has the beneficial effects that: the testing device detects the optimal working frequency, and then the resistor is adjusted in the wireless energy transfer device, so that the final product can work within a reasonable frequency range, the adjusting means is simple, the wireless energy transfer device is convenient to adjust and low in price, the testing device is relatively high in price, but the testing device is a product for testing and small in quantity, and the product cost can be greatly reduced by adopting the device provided by the invention.

Drawings

FIG. 1 is a circuit diagram of a testing apparatus.

FIG. 2 is a circuit diagram of frequency generation of a test apparatus.

Fig. 3 is a circuit diagram of a pulse width modulation circuit of the test apparatus.

FIG. 4 is a schematic diagram of a current detection circuit of the testing apparatus.

Fig. 5 is a schematic circuit diagram of a wireless energy transfer device.

Fig. 6 is a circuit diagram of a tunable squarer for a wireless energy transfer device.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

The manufacturing method of the optimal frequency wireless energy transfer device comprises a testing device and the wireless energy transfer device, wherein during testing, the anode of a thyristor D is connected with a transmitting coil Lf and a transmitting matching capacitor Cf of a circuit to be tested, as shown in figure 5, the circuit to be tested of the wireless energy transfer device is a part framed by a dotted line, and because an energy storage circuit exists in a working circuit, a load can be connected or not connected.

Then the waveform generator of the testing device changes different input waveforms according to the control signal, the control circuit detects the current signal output by the current detection circuit at the same time, the control circuit records the value of the collected current under different control signals, and the frequency output by the waveform generator when the measuring resistor Rs generates the maximum current to work is recorded as the maximum current frequency.

Finally, the anode of the operating thyristor DA is connected to the transmitting coil Lf and the transmitting matching capacitor Cf of the circuit to be tested, and the resistance value of the adjusting sliding resistor R2 is calculated according to the formula f 1/T1/{ 0.69(R1+2R2) C1 }. In the formula, f is the maximum current frequency, and the resistor R1 and the frequency generating capacitor C1 are fixed values, so that the wireless energy transfer device can work at the optimal frequency by adjusting the corresponding resistance value by a debugging person.

As shown in fig. 1, the testing apparatus of the present invention includes a waveform generator, a thyristor D, and a current detection circuit. The cathode of the thyristor D is connected with the measuring resistor Rs and then connected with the power ground. The waveform generator is connected with the grid of the thyristor D, the current detection circuit collects the current of the measuring resistor Rs, and the control circuit collects the voltage signal output by the current detection circuit and controls the waveform generator to generate waveforms.

As shown in fig. 2 and fig. 3, the waveform generator of the present invention includes a frequency generating chip U1, a crystal oscillator module U2, and a pulse width adjusting circuit, wherein the crystal oscillator module U2 is chip-connected to the frequency generating chip U1 to provide a stable frequency source for the frequency generating chip U1, a control pin of the frequency generating chip U1 is connected to the control circuit, the control circuit outputs a control command to enable an output terminal OUT of the frequency generating chip U1 to output different frequencies, and the output terminal OUT of the frequency generating chip U1 is input-connected to the pulse width adjusting circuit. The capacitances C1, C2, C3, C4 in fig. 2 may be chosen to be a capacitance of 0.1 uF. The frequency generation chip U1 of the present invention may be an AD9833 chip. The pulse width adjusting circuit comprises a timer U3, a resistor R, a sliding resistor R1 and a capacitor C5, pins 6 and 7 of the timer U3 are connected into the resistor R and the capacitor C5, a pin 2 is used for starting, a pin 3 is used as a frequency signal output pin, a pin 5 applies a voltage V1, the pin 5 is connected with a power supply through a series sliding resistor R1, and the values of the voltage V1 and the VCC voltage determine the pulse width of an output signal f 1. The timer U3 can be a 555 timer, and the capacitor C5 is a 0.1uF capacitor. The invention can generate sine wave or square wave according to the requirement, the output pulse width can be modulated according to the requirement, and the proper working frequency can be selected according to the optimal frequency.

As shown in fig. 4, the current detection circuit of the present invention includes a triode, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein the first resistor R1 is connected to an emitter of the triode and then grounded, the second resistor R2 is connected to a base of the triode after being connected in parallel with the measurement resistor Rs, one end of the third resistor R3 is connected to a power supply, the other end of the third resistor R3 is connected to the base of the triode, an anode of the diode D1 is connected to the fourth resistor R4 and then connected to the power supply, and a cathode of the diode D1 is connected to a collector of the triode. The fourth resistor R4 in the circuit can be a smaller resistor, such as a resistor of 0.1K omega, the measuring resistor Rs is 0.51 omega, the second resistor R2 is 7.2K omega, and the third resistor R3 is 47K omega.

As shown in fig. 1, in the working process of the present invention, the control circuit outputs a control signal to the waveform generator, the waveform generator changes different input waveforms according to the control signal, the control circuit detects a current signal output by the current detection circuit, the control circuit records the values of the collected currents under different control signals, and the frequency output by the waveform generator when the measurement resistor Rs generates the maximum current is recorded as the maximum current frequency.

The wireless energy transfer device comprises a circuit to be tested, an adjustable square wave device and a working thyristor DA, wherein the circuit to be tested comprises a transmitting coil Lf, a transmitting matching capacitor Cf, a receiving coil Lj, a receiving matching capacitor Cj, a boosting circuit and an energy storage circuit. The transmitting coil Lf and the transmitting matching capacitor Cf are connected in parallel and then connected with the anode of the working thyristor DA, and the cathode of the working thyristor DA is connected with the power ground. The receiving coil Lj and the receiving matching capacitor Cj are connected in parallel and then connected with a boosting circuit, and the boosting circuit is connected with an energy storage circuit. The adjustable square wave device is connected with the grid of the working thyristor DA, and the adjustable square wave device generates a waveform.

As shown in fig. 2, the tunable square wave device of the present invention includes a chip UC, a resistor R1, a sliding resistor R2, a frequency generating capacitor C1, and a capacitor C2, where the chip UC of the present invention may be an NE555 chip, a VCC pin and a RST pin of the chip UC are connected to a power supply, the resistor R1 is connected between the power supply and a DIG pin, the sliding resistor R2 is connected between the DIG pin and a TRI pin, the TRI pin and a THR pin are shorted, the frequency generating capacitor C1 is connected between the TRI pin and ground, and the capacitor C2 is connected between a CON pin and ground. The OUT is a square wave signal output, and the output frequency is f 1/T1/{ 0.69(R1+2R2) C1}, because the value of the sliding resistor R2 in the circuit can be manually adjusted, the square wave signal output frequency of the invention can be adjusted, and the modulation of the emission frequency is further realized. According to the invention, the frequency generating capacitor C1 is 0.01uF, the capacitor C2 is 1uF, the resistor R1 is 2.1K omega, and the resistance change of the sliding resistor R2 is 35-70K omega, so that the frequency of the output square wave can be adjusted between 1000H z-2000 Hz, and the transmission frequency can be adjusted between corresponding working frequencies.

As shown in fig. 1, the voltage boost circuit includes a fet UA, a boost inductor LS, a boost capacitor CS, and a diode DS. And the boosting capacitor CS and the diode DS are connected in series and then are connected with the boosting inductor LS and a power ground. And a source electrode S of the field effect tube UA is connected with the energy storage circuit. When the voltage is too low, such as the distance between the transmitting coil and the receiving coil is too far, the field-effect tube UA is turned off, an input signal stores energy for the boost inductor LS, when the voltage is suitable for charging, the field-effect tube UA is turned on, the input signal and the boost inductor LS provide energy for a load together, and the output voltage is the boosted voltage at the moment, so that the boost effect is achieved.

The energy storage circuit can store energy received by the system and supply power to subsequent circuits. The energy storage element adopts a super farad capacitor CA or a chemical battery DA or the two are connected in parallel, when the input power is larger than the power required by the Internet of things equipment, the energy is stored, otherwise, the power is supplied to the Internet of things equipment for use when the input electric quantity is insufficient.

As shown in fig. 1, in the process of processing and debugging, the device of the present invention firstly measures the optimal operating frequency of the corresponding transmitting and receiving coil through an instrument, and correspondingly adjusts the resistance of the sliding resistor R2, so that the adjustable square wave filter operates at the optimal operating frequency, and the device of the present invention can finally operate at the optimal transmitting and receiving frequencies, thereby improving the efficiency.