CN111271853B - Wireless sensor system - Google Patents
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- CN111271853B CN111271853B CN201910808781.XA CN201910808781A CN111271853B CN 111271853 B CN111271853 B CN 111271853B CN 201910808781 A CN201910808781 A CN 201910808781A CN 111271853 B CN111271853 B CN 111271853B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention discloses a wireless sensor system, which comprises a main control unit, wherein the main control unit is connected with a sine wave generation unit and can generate a sine waveControlling a sine wave generating unit to generate a sine wave with a preset frequency; the main control unit is also connected with the port selection circuit and is used for controlling the port to be connected with the first resonant capacitor or the second resonant capacitor; the first resonant capacitor or the second resonant capacitor is connected with the temperature detection unit through the electromagnetic induction unit; the change of the load resistance value of the temperature detection unit is coupled to a receiving coil side circuit loop of the electromagnetic induction unit through the electromagnetic induction unit, so that the current value I of the receiving coil loop is caused1(ii) a change; the main control unit is also connected with a current detection unit, and the current detection unit is used for detecting the loop current I at the receiving coil side of the electromagnetic induction unit1(ii) a The main controller is based on the current I1And calculating the load resistance value of the temperature detection unit, looking up the table to obtain the temperature, realizing wireless transmission of temperature information and saving a longer physical connection line.
Description
Technical Field
The invention relates to the field of air conditioner circuits, in particular to a wireless sensor system.
Background
The current air conditioner uses a thermistor as a temperature sensing bulb, and the working state of a motor is adjusted according to the measured ambient temperature or coil temperature. The temperature sensing bulb of the current air conditioner is connected with the main control unit in a physical connection mode, so that temperature signals are transmitted. However, as the scale of air conditioner manufacturers is enlarged, the number of air conditioner models is increased, structural components are changed, and a temperature sensing bulb with a single length cannot meet the requirement. Meanwhile, the inside of the air conditioner is provided with a plurality of sheet metal parts, and the risk of abrasion exists due to the use of physical connecting lines. Based on the consideration, the invention provides a wireless sensor implementation mode, aiming at overcoming various defects caused by the physical connecting lines.
The current magnetic coupling resonance type electric energy transmission technology is used in the fields of wireless charging and the like, and non-contact electric energy transmission can be realized by utilizing the physical separation characteristic of a primary coil and a secondary coil of a separable loose coupling transformer. The magnetic coupling resonance type electric energy transmission technology is the prior art, and related principles and parameters refer to but are not limited to a paper 'experimental research on loosely coupled transformers of non-contact electric energy transmission systems', wherein authors refer to Zhengying mache, Chenhong and Zhang xi En.
In the prior art, a typical contactless power transmission system using a magnetic coupling resonant power transmission technology is composed of units such as a power supply, primary side and secondary side rectification filters, primary side and secondary side resonance compensation, a primary side inverter circuit, a loosely coupled transformer, and a load. The working process of the system is that the power frequency alternating current power supply generates high frequency alternating current after twice conversion of rectification filtering and high frequency inversion of the primary side and supplies the high frequency alternating current to the primary coil, alternating magnetic flux generated by the primary coil is linked with the secondary coil, so that induced voltage is generated on the secondary side, and the voltage on the secondary side is supplied to a load after being rectified and filtered.
At present, a magnetic coupling resonance type electric energy transmission technology is mainly used in the field of wireless energy transmission and application of wireless energy transmission in a direct current motor, but the problem of wireless connection and communication between an air conditioner temperature measurement value and a main control unit is not solved. The scheme of the invention is that the change of temperature conditions causes the resistance value of the load temperature sensing bulb to change, the resistance value coupled to a receiving side is caused to change, and further the current change of the current of the receiving side is caused, the current resistance value of the temperature sensing bulb is calculated by collecting the total current of the receiving side, and the temperature corresponding to the resistance value of the temperature sensing bulb is inquired by a table look-up method, so that the wireless transmission of temperature information is realized.
Disclosure of Invention
An object of the present invention is to provide a wireless sensor system that enables wireless communication between a temperature detection unit and a main controller.
Specifically, the invention is realized by the following technical scheme:
a wireless sensor system comprises a wireless sensor system which comprises a main control unit, a temperature detection unit, a sine wave generation unit, a port selection circuit and an electromagnetic induction unit, wherein the main control unit is connected with the sine wave generation unit, and the main control unit controls the sine wave generation unit to generate a preset frequencyA sine wave of rate; the main control unit is also connected with a port selection circuit and is used for selecting a port to be connected with the first resonant capacitor or the second resonant capacitor; the first resonance capacitor and the second resonance capacitor are connected with a receiving coil of the electromagnetic induction unit; the electromagnetic induction unit comprises a receiving coil and two sending coils, and the sending coils of the electromagnetic induction unit are connected with the temperature detection unit; the temperature detection unit comprises an environment temperature detection unit and a coil temperature detection unit, the environment temperature detection unit is connected with a first sending coil of the electromagnetic induction unit, and the coil temperature detection unit is connected with a second sending coil of the electromagnetic induction unit; the main control unit is also connected with a current detection unit, and the current detection unit is used for detecting the total current I of the receiving coil loop1(ii) a The main control unit can also be used for controlling the current I1And calculating the load resistance value of the temperature detection unit, and looking up the table to obtain the ambient temperature or the coil temperature.
Preferably, the wireless sensor system comprises a first resonant capacitor, a second resonant capacitor, a third resonant capacitor and a fourth resonant capacitor, wherein one end of the first resonant capacitor is connected with the port selection circuit, and the other end of the first resonant capacitor is connected with the receiving coil of the electromagnetic induction unit; one end of the second resonance capacitor is connected with the port selection circuit, and the other end of the second resonance capacitor is connected with the receiving coil of the electromagnetic induction unit; one end of the third resonant capacitor is connected with the first thermistor, and the other end of the third resonant capacitor is connected with the first sending coil of the electromagnetic induction unit; one end of the fourth resonance capacitor is connected with the second thermistor, and the other end of the fourth resonance capacitor is connected with the second sending coil of the electromagnetic induction unit.
Preferably, the electromagnetic induction unit is a separable loose coupling transformer, and includes a receiving coil, a first transmitting coil and a second transmitting coil.
Preferably, the sine wave generating unit comprises a first driving circuit, a first switch tube, a second driving circuit and a second switch tube; the utility model discloses a switch tube, including first switch tube and second switch tube, first drive circuit one end is connected with the main control unit, and the other end is connected with the grid of first switch tube, second drive circuit one end is connected with the main control unit, and the other end is connected with the grid of second switch tube, the drain electrode of first switch tube is connected with DC power supply, the source electrode of first switch tube with the drain electrode of second switch tube is connected, the source electrode ground connection of second switch tube, draw forth the wire between the source electrode of first switch tube and the drain electrode of second switch tube and regard as the output of sine wave unit, be connected with port selection circuit.
Preferably, the temperature detection unit comprises an ambient temperature detection unit and a coil temperature detection unit, the ambient temperature detection unit comprises a third resonant capacitor and a first thermistor, the third resonant capacitor is connected with a first sending coil of the electromagnetic induction unit, the coil temperature detection unit comprises a fourth resonant capacitor and a second thermistor, and the fourth resonant capacitor is connected with a second sending coil of the electromagnetic induction unit.
Preferably, the current detection unit connected to a circuit connecting the receiving coil of the electromagnetic induction unit and the main control module is a switch circuit, a sampling unit and an amplification unit, and the switch circuit can close or close the circuit connecting the receiving coil of the electromagnetic induction unit and the main control unit.
Preferably, the sampling unit is a sampling resistor, one end of the sampling resistor is connected with the second resonant capacitor, and the other end of the sampling resistor is grounded.
Preferably, the direct current voltage is used for providing voltage for the main control unit and the sine wave transmitting unit, and the direct current voltage is the voltage passing through the rectifying circuit and then is input into the circuit of the sine wave transmitting unit to output a sine wave signal.
Preferably, a method of transmitting temperature information using a wireless sensor system, the method comprising:
when the ambient temperature needs to be detected:
step 1, when a main control unit needs to collect the ambient temperature, a control port selection circuit is connected to a first resonance capacitor;
step 2, the main control unit controls the sine wave generating unit to generate a sine wave signal with the resonant frequency of the first resonant capacitor;
step 3, the main control unit controls the switch circuit to be closed;
step 4, the main control unit obtains the current I of the receiving loop from the current detection unit1；
Step 5, the main control unit calculates the resistance value of the first thermistor;
step 6, the main control unit obtains the current environment temperature through a table look-up method;
and 7, adjusting the power of the direct current motor module by the main control unit so as to adjust the ambient temperature to a desired value.
When the coil temperature needs to be detected:
step 1, a main control unit needs to acquire the temperature of a coil pipe, and a control port selection circuit is connected to a second resonance capacitor;
step 2, the main control unit controls the sine wave generating unit to generate a sine wave signal with the resonant frequency of the second resonant capacitor;
step 3, the main control unit controls the switch circuit to be closed;
step 4, the main control unit obtains the loop current I from the current detection unit1；
Step 5, the main control unit calculates the resistance value of the second thermistor;
step 6, the main control unit obtains the current coil temperature through a table look-up method;
and 7, adjusting the power of the direct current motor module by the main control unit so as to adjust the temperature of the coil to a desired value.
The invention has the beneficial effects that: the transmission of the temperature and the environmental temperature information of the air conditioner coil is realized in a wireless mode, a long physical connecting line is omitted, and the generalization is easy to realize; the circuit structure is simple and easy to realize; the multi-channel information transmission can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a logic module of a wireless sensor system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a logic module of a wireless sensor system according to a second embodiment of the present invention;
fig. 3 is a detailed schematic diagram of a wireless sensor system according to a third embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
A wireless sensor system is shown in fig. 1 and comprises a main control unit, a temperature detection unit, a sine wave generation unit, a port selection circuit and an electromagnetic induction unit, wherein the main control unit is connected with the sine wave generation unit and controls the sine wave generation unit to generate sine waves with preset frequency; the main control unit is also connected with a port selection circuit and is used for selecting a port to be connected with the first resonant capacitor or the second resonant capacitor; the port selection circuit is connected with a receiving coil of the electromagnetic induction unit, a sending coil of the electromagnetic induction unit is connected with the temperature detection unit, and a switching circuit is arranged on a circuit connecting the receiving coil of the electromagnetic induction unit and the main control unit and can close or disconnect the circuit connecting the receiving coil of the electromagnetic induction unit and the main control unit; the current detection unit is used for detecting the current value of a circuit loop formed by the main control unit, the port selection unit and the electromagnetic induction unit receiving coil.
The temperature detection unit comprises an ambient temperature detection unit and a coil temperature detection unit, the ambient temperature detection unit comprises a third resonance capacitor and a first thermistor, and the third resonance capacitor is connected with a first sending coil and the first thermistor of the electromagnetic induction unit in series; the coil temperature detection unit comprises a fourth resonance capacitor and a second thermistor, and the fourth resonance capacitor is connected with a second sending coil of the electromagnetic induction unit and the second thermistor in series; the resistance values of the first thermistor and the second thermistor may vary according to a temperature change.
The following describes a specific communication method of the wireless system, taking the example that the ambient temperature detection unit transmits temperature information to the main control unit.
Step 1: when the main control unit needs to acquire the environmental temperature information, the main control unit controls the switch circuit to be closed and controls the port selection circuit to be connected to the first resonance capacitor, the first resonance capacitor resonates with the receiving coil, and the resonance frequency of the first resonance capacitor is f0Since this frequency is a natural frequency of the transmission system, the energy transfer efficiency is highest at this time. The resonant frequency is calculated as follows:
in the formula (f)0Is the resonant frequency of the system; and L is the inductance of the transmitting and receiving coil.
Meanwhile, the main control unit sends a signal to the sine wave generating unit to enable the sine wave generating unit to generate a preset frequency f0The output frequency of the main control circuit is f0The PWM signal of (1).
Step 2: the main control unit obtains the current I on a loop consisting of the main control unit, the current detection unit, the port selection circuit, the first resonant capacitor and the receiving coil through the current detection unit1Calculating the impedance Z of the circuit loop of the ambient temperature detection unit according to the formula (2)22
Wherein, USFor the input voltage at the present duty cycle, Z11Is the self-impedance of the side of the receiving coil,
the reflected impedance of the transmitting coil side on the receiving coil side. Z11Can be obtained by calculating the high-frequency impedance, the power supply internal resistance and the load resistance value of the receiving coil side, the high-frequency impedance, the power supply internal resistance and the load resistance value of the coil are known, and the current I1The mutual inductance M between the coils of the electromagnetic induction unit is also known (when the distance between the two coils is fixed, M can be determined and is unique) through the detection of the current detection unit, so that the impedance Z of the circuit loop of the ambient temperature detection unit is calculated22。
And step 3: the main control unit calculates the resistance value of the first thermistor PTC1
Resistance R of PTC12And Z22Is as follows
Z22＝R2+jωL+RL(formula 3)
From the formula (3), the formula (4) can be obtained
R2＝Z22-jωL-RL(formula 4)
L is inductance of the transmitting coil, RLThe high frequency impedance of the transmitting coil is known, so that the resistance R of the PTC1 can be obtained by the main control unit2
And 4, step 4: the master control unit obtains the temperature corresponding to the resistance value of the current first thermistor by looking up a table
For example, in the internal memory of the main control unit, the following "thermistor resistance value-temperature" look-up table is stored:
| thermistor resistance value | Temperature of |
| k1 | 20 |
| k2 | 21 |
| k3 | 22 |
| k4 | 23 |
| k5 | 24 |
| … | … |
If the master control unit calculates the thermistor resistance as k3, then a look-up table can be used to obtain that the current ambient temperature is 22 degrees.
And 5: and the main control unit controls the power of the air conditioner motor according to the current ambient temperature to enable the ambient temperature to reach a desired value.
The process that the coil pipe temperature detection unit transmits temperature information to the main control unit is the same as the process that the environment temperature detection unit communicates with the main control unit, the difference lies in that in step 1, the main control unit controls the port selection circuit, the selection port is communicated with the second resonance capacitor, and controls the sine wave transmission unit to output sine wave signals of the resonance frequency of the second resonance capacitor and the electromagnetic induction unit receiving coil, and the rest steps are the same and are not detailed.
Further, as shown in fig. 2, on a line where the receiving coil of the electromagnetic induction unit is connected with the main control unit, the connected current detection unit includes a sampling unit, an amplifying unit and a switch circuit, the sampling unit is configured to sample a received sine wave, and the amplifying unit is configured to amplify a sampled sine wave signal, so that the size of the sampled sine wave signal is adapted to the size of a signal that can be processed by the main control unit. The switch circuit can close or open a circuit for connecting the receiving coil of the electromagnetic induction unit with the main control unit.
Specifically, as shown in fig. 3, the electromagnetic induction unit is a separable loose-coupling transformer, and includes a receiving coil, a first transmitting coil and a second transmitting coil, where the transmitting coil and the receiving coil of the transformer can be separated from each other, so as to facilitate disassembly. The separable loose coupling transformer is connected with a first resonance capacitor, a second resonance capacitor, a third resonance capacitor and a fourth resonance capacitor, one end of the first resonance capacitor is connected with the port selection circuit, and the other end of the first resonance capacitor is connected with a receiving coil of the separable loose coupling transformer; one end of the second resonance capacitor is connected with the port selection circuit, and the other end of the second resonance capacitor is connected with a receiving coil of the separable loose coupling transformer; one end of the third resonant capacitor is connected with the first thermistor, and the other end of the third resonant capacitor is connected with the first transmitting coil of the separable loose coupling transformer; one end of the fourth resonance capacitor is connected with the second thermistor, and the other end of the fourth resonance capacitor is connected with the second sending coil of the separable loose coupling transformer.
Specifically, the sampling unit is a sampling resistor, one end of the sampling resistor is connected with the port selection circuit, and the other end of the sampling resistor is grounded.
In the invention, the main control unit is connected with the temperature detection unit without a lead, the resistance value of the thermistor carrying temperature information is transmitted from one end of the electromagnetic induction unit to the other end of the electromagnetic induction unit in an electromagnetic induction mode, the main control unit can obtain the temperature information to be transmitted by the temperature detection unit by analyzing the resistance value of the thermistor, and the whole process has no lead for signal transmission, namely the concept of wireless communication.
Further, the sine wave generating unit comprises a first driving circuit, a first switch tube, a second driving circuit and a second switch tube, wherein the first switch tube and the second switch tube are N-channel enhanced MOSFETs, one end of the first driving circuit is connected with the main control unit, the other end of the first driving circuit is connected with the grid electrode of the first switch tube, one end of the second driving circuit is connected with the main control unit, the other end of the second driving circuit is connected with the grid electrode of the second switch tube, the drain electrode of the first switch tube is connected with the direct-current power supply unit, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube, the source electrode of the second switch tube is grounded, and a lead is led out between the source electrode of the first switch tube and the drain electrode of the second switch tube to serve as the output end of the sine wave generating unit and is connected with the port selection circuit.
The electromagnetic induction unit is provided with a resonant capacitor and a wound coil, so that an LC frequency selection circuit is formed, and a first harmonic wave, namely a sine wave, can be selected from square waves output between the source electrode of the first switching tube and the drain electrode of the second switching tube.
By adopting the structure, when different PWM square waves are output from the ports of the main control unit connected with the first drive circuit and the second drive circuit, the square waves with the same amplitude but different periods as the PWM square waves are output between the source electrode of the first switch tube and the drain electrode of the second switch tube.
The invention has the advantages that: the temperature information of the temperature detection unit can be obtained in a wireless mode, a long physical connecting line is omitted, and the temperature detection unit is convenient to disassemble. The circuit structure is simple and easy to realize. The multi-channel information transmission can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A wireless sensor system is characterized by comprising a main control unit, a temperature detection unit, a sine wave generation unit, a port selection circuit and an electromagnetic induction unit, wherein the main control unit is connected with the sine wave generation unit and controls the sine wave generation unit to generate sine waves with preset frequency; the main control unit is also connected with a port selection circuit and is used for selecting a port to be connected with the first resonant capacitor or the second resonant capacitor; the first resonance capacitor and the second resonance capacitor are connected with a receiving coil of the electromagnetic induction unit; the electromagnetic induction unit comprises a receiving coil and two sending coils, and the sending coils of the electromagnetic induction unit are connected with the temperature detection unit; the temperature detection unit comprises an environment temperature detection unit and a coil temperature detection unit, the environment temperature detection unit is connected with a first sending coil of the electromagnetic induction unit, and the coil temperature detection unit is connected with a second sending coil of the electromagnetic induction unit; the main control unit is also connected with a current detection unit, and the current detection unit is used for detecting the total current I of the receiving coil loop1(ii) a The main control unit can also be used for controlling the current I1And calculating the load resistance value of the temperature detection unit, and looking up the table to obtain the ambient temperature or the coil temperature.
2. The wireless sensor system according to claim 1, comprising a first resonant capacitor, a second resonant capacitor, a third resonant capacitor and a fourth resonant capacitor, wherein one end of the first resonant capacitor is connected to the port selection circuit, and the other end of the first resonant capacitor is connected to the receiving coil of the electromagnetic induction unit; one end of the second resonance capacitor is connected with the port selection circuit, and the other end of the second resonance capacitor is connected with the receiving coil of the electromagnetic induction unit; one end of the third resonant capacitor is connected with the first thermistor, and the other end of the third resonant capacitor is connected with the first sending coil of the electromagnetic induction unit; one end of the fourth resonance capacitor is connected with the second thermistor, and the other end of the fourth resonance capacitor is connected with the second sending coil of the electromagnetic induction unit.
3. The wireless sensor system of claim 1, wherein the electromagnetic induction unit is a separable loosely coupled transformer comprising a receiving coil, a first transmitting coil and a second transmitting coil.
4. The wireless sensor system according to claim 1, wherein the sine wave generation unit comprises a first driving circuit, a first switching tube, a second driving circuit and a second switching tube; the utility model discloses a switch tube, including first switch tube and second switch tube, first drive circuit one end is connected with the main control unit, and the other end is connected with the grid of first switch tube, second drive circuit one end is connected with the main control unit, and the other end is connected with the grid of second switch tube, the drain electrode of first switch tube is connected with DC power supply, the source electrode of first switch tube with the drain electrode of second switch tube is connected, the source electrode ground connection of second switch tube, draw forth the wire between the source electrode of first switch tube and the drain electrode of second switch tube and regard as the output of sine wave unit, be connected with port selection circuit.
5. The wireless sensor system according to claim 1, wherein the temperature detection unit includes an ambient temperature detection unit and a coil temperature detection unit, the ambient temperature detection unit includes a third resonant capacitor and a first thermistor, the third resonant capacitor is connected to the first transmission coil of the electromagnetic induction unit, the coil temperature detection unit includes a fourth resonant capacitor and a second thermistor, and the fourth resonant capacitor is connected to the second transmission coil of the electromagnetic induction unit.
6. The wireless sensor system of claim 1, wherein the current detection unit connected to the circuit connecting the receiving coil of the electromagnetic induction unit and the main control module is a switch circuit, a sampling unit and an amplification unit; the switch circuit can close or open a circuit for connecting the receiving coil of the electromagnetic induction unit with the main control unit.
7. The wireless sensor system of claim 6, wherein the sampling unit is a sampling resistor, one end of the sampling resistor is connected to the second resonant capacitor, and the other end of the sampling resistor is grounded.
8. The wireless sensor system according to claim 1, wherein a dc voltage is applied to the main control unit and the sine wave generating unit, and the dc voltage is a voltage passed through the rectifying circuit and then input to the sine wave generating circuit to output a sine wave signal.
9. A method for transmitting temperature information by using the wireless sensor system of any one of claims 1 to 8, the method comprising:
when the ambient temperature needs to be detected:
step 1: when the main control unit needs to collect the ambient temperature, the control port selection circuit is connected to the first resonance capacitor;
step 2: the main control unit controls the sine wave generating unit to generate a sine wave signal with the resonant frequency of the first resonant capacitor;
step 3, the main control unit controls the switch circuit to be closed;
step 4, the main control unit obtains the current I of the receiving loop from the current detection unit1；
Step 5, the main control unit calculates the resistance value of the first thermistor;
step 6, the main control unit obtains the current environment temperature through a table look-up method;
step 7, the main control unit adjusts the power of the direct current motor module so as to adjust the ambient temperature to a desired value;
when the coil temperature needs to be detected:
step 1, a main control unit needs to acquire the temperature of a coil pipe, and a control port selection circuit is connected to a second resonance capacitor;
step 2, the main control unit controls the sine wave generating unit to generate a sine wave signal with the resonant frequency of the second resonant capacitor;
step 3, the main control unit controls the switch circuit to be closed;
step 4, the main control unit obtains the loop current I from the current detection unit1；
Step 5, the main control unit calculates the resistance value of the second thermistor;
step 6, the main control unit obtains the current coil temperature through a table look-up method;
and 7, adjusting the power of the direct current motor module by the main control unit so as to adjust the temperature of the coil to a desired value.
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106685101A (en) * | 2015-11-11 | 2017-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Wireless power transmitting circuit and wireless power receiving circuit |
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