Non-contact powered rotary multi-channel temperature transmitter

Abstract

This invention relates to a non-contact powered rotary multichannel temperature transmitter, comprising: a discrete transformer including a primary coil and a secondary coil coupled to each other; a first processing unit connected to the primary coil and connected to an external power supply, the first processing unit driving the primary coil to generate an alternating magnetic field to induce an alternating electromotive force in the secondary coil; and a second processing unit connected to the secondary coil, the second processing unit being connected to a plurality of temperature sampling sensors for real-time sampling of the temperature signal of a motor rotor, the second processing unit responding to the temperature signal to generate an impedance change signal reflecting the temperature signal data, causing the secondary coil to transmit the signal to the first processing unit via the primary coil through electromagnetic induction. This invention offers higher measurement accuracy, better measurement results, a simpler overall circuit structure, and lower cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature detection devices, in particular to a non-contact power supply rotating multi-path temperature transmitter. BACKGROUND

[0002] At present, the proportion of motor power consumption in total power consumption in China can reach 50%, and the proportion of motor power consumption in industrial power consumption is close to 70%. Reducing motor energy consumption has become an urgent task. High-efficiency energy-saving permanent magnet motor has been widely popularized and applied because of its remarkable energy-saving effect, and its efficiency can be improved by about 5%-10%.

[0003] The rare earth permanent magnet on the rotor of the high-efficiency permanent magnet motor is a key component for realizing its function. Long-term overload, frequent start-stop and unreasonable driving parameter setting of the motor can easily cause high temperature demagnetization. Once the permanent magnet demagnetizes, the process is irreversible, and the rotor of the whole motor will be scrapped over a long period of time. Therefore, it is very important to monitor the temperature of the electronic rotor in real time.

[0004] The rotating temperature transmitter is suitable for temperature measurement and transmission of rotating parts. The temperature signal is transmitted through electromagnetic induction, and then converted into standard 4-20mA current to complete temperature control. The power supply uses non-contact power transmission technology, and the measurement data is transmitted back using infrared transmission communication technology. The traditional rotating temperature transmitter generally uses a separate transformer to solve the problem of power supply on the rotor side. For the problem of temperature data transmission, the sensor signal is converted into a frequency signal through a frequency conversion method after the rotor side circuit works, and is fed back to the stator through wireless electromagnetic waves. This method easily mixes the electromagnetic field and the rotor wireless magnetic field, causing measurement interference. Or use infrared technology that does not interfere with the electromagnetic field to transmit the signal from the rotor side to the stator side, but an additional infrared transmitting and receiving device is required. This method increases the hardware cost and circuit complexity, and has high cost. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a non-contact power supply rotating multi-path temperature transmitter to solve the technical problems of the prior art that the rotating temperature transmitter is easy to be disturbed, the circuit is complex and the cost is high.

[0006] To achieve the above-mentioned purposes and other related purposes, the present application provides the following technical scheme:

[0007] A non-contact power supply rotating multi-path temperature transmitter comprises:

[0008] A separate transformer, the separate transformer comprises a primary coil and a secondary coil coupled to each other, the primary coil is arranged on the stator side of the motor, and the secondary coil is arranged on the rotor side of the motor;

[0009] A first processing unit connected with the primary coil, the first processing unit being connected with an external power supply, the first processing unit being used to drive the primary coil to generate an alternating magnetic field to make the secondary coil generate an alternating electromotive force;

[0010] A second processing unit connected with the secondary coil, the second processing unit being connected with a plurality of temperature sampling sensors, the temperature sampling sensors being used to sample a temperature signal of a motor rotor in real time, the second processing unit being responsive to the temperature signal to generate an impedance change signal reflecting the temperature signal data to make the secondary coil send the impedance change signal to the first processing unit through electromagnetic induction.

[0011] The above technical solution is implemented, and when in use, the primary coil and the first processing unit of the separate transformer are arranged on the motor stator side, the secondary coil and the second processing unit are arranged on the motor rotor side, the external power supply provides working voltage for the temperature transmitter, the first processing unit drives the primary coil to generate an alternating magnetic field to make the secondary coil generate an alternating electromotive force when working, thereby achieving power supply for the second processing unit and the temperature sampling sensors and other loads; the temperature sampling sensors are connected with the motor rotor, can collect the temperature of the motor rotor in real time and form a temperature signal, the second processing unit generates an impedance change signal after receiving the temperature signal, the impedance change signal can reflect the temperature signal data, at this time, the secondary coil sends the impedance change signal to the first processing unit through electromagnetic induction, thereby achieving real-time collection and transmission of the motor rotor temperature signal; since the rotor side circuit is powered by the induced electromotive force, and the temperature signal is sent through electromagnetic induction by changing the current amplitude to generate the impedance change signal, the two do not interfere with each other, the measurement accuracy is higher, the measurement effect is better, and the overall circuit structure is simpler, without the need for additional receiving and sending devices, and the cost is lower.

[0012] As a preferred solution of the application, the first processing unit comprises:

[0013] A first voltage stabilizing circuit connected with the external power supply;

[0014] A first single-chip microcomputer module connected with the first voltage stabilizing circuit; and

[0015] An H-bridge driver connected with the first single-chip microcomputer module, the H-bridge driver being connected with the primary coil and the external power supply, and being used to invert the direct-current power supply into an alternating-current circuit with variable frequency to supply the primary coil to make the separate transformer output a predetermined voltage value.

[0016] The first voltage stabilizing circuit is used for stabilizing the voltage source, so that the first single-chip microcomputer module is supplied with stable power, and the H-bridge driver is used for inverting the direct current power into alternating current power with variable frequency to supply the primary coil, so that the voltage output of the secondary coil is only related to the turns ratio of the primary coil and the secondary coil, and the predetermined voltage value can be output after the turns ratio is selected.

[0017] The first voltage stabilizing circuit comprises a first input interface and a second input interface, the first input interface is connected with a fast recovery diode, and the anode of the fast recovery diode is connected with the first input interface.

[0018] The fast recovery diode is used for preventing the power supply from being reversely connected, so that the positive and negative poles of the wire are not connected reversely and the subsequent circuit is not damaged.

[0019] The H-bridge driver comprises an H-bridge driving chip.

[0020] The second processing unit comprises:

[0021] The rectifier filter circuit connected with the secondary coil;

[0022] The equivalent impedance change switch circuit connected with the rectifier filter circuit is used for sensing the temperature signal to change the access resistance value to generate an impedance change signal.

[0023] The second voltage stabilizing circuit connected with the equivalent impedance change switch circuit is used for stabilizing the alternating electromotive force to provide a stable voltage source for the load.

[0024] The temperature acquisition circuit connected with the second voltage stabilizing circuit is connected with the temperature sampling sensor and is used for acquiring the temperature signal.

[0025] The second single-chip microcomputer module connected with the temperature acquisition circuit is connected with the second voltage stabilizing circuit and the equivalent impedance change switch circuit.

[0026] The above technical solution is realized, when power supply, the secondary side coil induces alternating electromotive force, and then the alternating electromotive force is rectified and filtered by a rectifier filter circuit, and then is stabilized by a second voltage stabilizing circuit, thereby stably supplying power to a second single-chip microcomputer module, a temperature acquisition circuit, a temperature sampling sensor and other loads; after the temperature sampling sensor acquires a temperature signal, the corresponding temperature signal is acquired by the temperature acquisition circuit, and then is sent to the second single-chip microcomputer module for processing, and the signal is sent to an equivalent impedance change switch circuit; after the equivalent impedance change switch circuit receives the signal, the resistance value connected is changed, thereby generating an impedance change signal, which is then sent to the primary side coil in an electromagnetic induction mode by the secondary side coil, thereby realizing acquisition and sending of the temperature signal.

[0027] As a preferred scheme of the application, the temperature acquisition circuit comprises a temperature sampling chip and a sampling analog circuit connected to the temperature sampling chip, the sampling analog circuit comprises a plurality of sampling branches corresponding to the temperature sampling sensors, and each sampling branch is connected to the temperature sampling chip through a low-pass filter.

[0028] The above technical solution is realized, a constant current source is provided by the temperature sampling chip, the temperature signal acquired by the temperature sampling sensor is converted into a voltage signal, the high-frequency interference is effectively suppressed after the voltage signal passes through the low-pass filter, and each sampling branch can transmit the signals acquired by the temperature sampling sensors to the temperature sampling chip, and then the temperature sampling chip processes the signals, thereby completing the temperature sampling process.

[0029] As a preferred scheme of the application, the equivalent impedance change switch circuit comprises a field effect transistor connected to the second single-chip microcomputer module and a current limiting resistor connected to the field effect transistor, the field effect transistor is turned on in response to the temperature signal to connect the current limiting resistor, thereby generating the impedance change signal.

[0030] The above technical solution is realized, the field effect transistor is turned on and turned off, thereby connecting or disconnecting the current limiting circuit, realizing the change of the equivalent resistance value in the circuit, and further changing the current amplitude, thereby forming the impedance change signal.

[0031] As a preferred scheme of the application, the temperature sampling sensor adopts a PT100 platinum resistance.

[0032] As described above, the application has the following beneficial effects:

[0033] The application provides a non-contact power supply rotary multi-path temperature transmitter, wherein the primary coil of a transformer and a first processing unit are arranged on the stator side of a motor, the secondary coil and a second processing unit are arranged on the rotor side of the motor, an external power supply provides working voltage for the temperature transmitter, the first processing unit drives the primary coil to generate an alternating magnetic field when working, so that the secondary coil generates an alternating electromotive force, and the power supply for the second processing unit and a temperature sampling sensor and other loads is realized; the temperature sampling sensor is connected with the motor rotor, can collect the temperature of the motor rotor in real time and form a temperature signal, the second processing unit generates an impedance change signal after receiving the temperature signal, the impedance change signal can reflect the temperature signal data, at this time, the secondary coil sends the impedance change signal to the first processing unit in the form of electromagnetic induction, so that the real-time collection and transmission of the temperature signal of the motor rotor are realized; since the rotor side circuit is powered by the induced electromotive force, and the temperature signal is sent in the form of electromagnetic induction by changing the current amplitude to generate the impedance change signal through impedance conversion, the two do not interfere with each other, the measurement accuracy is higher, the measurement effect is better, and the overall circuit structure is simpler, without the need of additional receiving and sending devices, and the cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The circuit principle diagram of the embodiment one of the application is shown.

[0035] Figure 2 The circuit principle diagram of the impedance change signal generating circuit in the embodiment one of the application is shown.

[0036] Figure 3 The waveform change diagram of the signal in the data transmission process in the embodiment one of the application is shown.

[0037] Figure 4 The circuit principle diagram of the embodiment two of the application is shown.

[0038] Figure 5 The circuit principle diagram of the sampling analog circuit in the embodiment two of the application is shown.

[0039] Figure 6 The circuit principle diagram of the temperature sampling chip in the embodiment two of the application is shown.

[0040] Figure 7 The circuit principle diagram of the second single-chip microcomputer module in the embodiment two of the application is shown.

[0041] Figure 8 The circuit principle diagram of the equivalent impedance change switch circuit in the embodiment two of the application is shown.

[0042] Figure 9 The circuit principle diagram of the first voltage stabilizing circuit in the embodiment two of the application is shown.

[0043] Figure 10 The circuit schematic diagram of the first single-chip microcomputer module in Embodiment Two of the application is shown.

[0044] Figure 11 The circuit schematic diagram of the H-bridge driver in Embodiment Two of the application is shown.

[0045] Figure 12 The equivalent circuit diagram of the H-bridge driver in Embodiment Two of the application is shown. DETAILED DESCRIPTION

[0046] The embodiments of the application are illustrated by specific working examples below, and other advantages and effects of the application can be easily understood by those skilled in the art from the content disclosed in the specification.

[0047] Reference is made to Figures 1 to 12 It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are merely used to illustrate the content disclosed in the specification for the understanding and reading of those skilled in the art, and do not define the limiting conditions for the implementation of the application, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the application, should still fall within the scope of the technology disclosed by the application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are merely for the clear understanding of the description, and are not used to limit the scope of the implementation of the application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the application.

[0048] Embodiment One

[0049] Reference is made to Figures 1 to 3 The application provides a high-speed rotating temperature transmitter, comprising: a separate transformer, the separate transformer comprising a primary coil and a secondary coil coupled to each other, the primary coil being arranged on the stator side of the motor, and the secondary coil being arranged on the rotor side of the motor; a first processing unit connected with the primary coil, the first processing unit being connected to an external power supply, and the first processing unit being used to drive the primary coil to excite an alternating magnetic field to make the secondary coil form an alternating electromotive force; and a second processing unit connected with the secondary coil, the second processing unit being connected with a plurality of temperature sampling sensors, the temperature sampling sensors being used to sample the temperature signal of the motor rotor in real time, and the second processing unit being used to generate an impedance change signal reflecting the temperature signal data in response to the temperature signal to make the secondary coil send the impedance change signal to the first processing unit through the primary coil in an electromagnetic induction mode.

[0050] Specifically, there is a special medium such as an air gap or water between the primary and secondary coils of the split transformer. Through the principle of electromagnetic coupling induction, an alternating electromotive force can be generated to achieve non-contact power transmission. The first processing unit can convert ordinary power supply into high-frequency AC power supply that can be used by the primary coil of the split transformer, while the second processing unit can perform AC conversion on the secondary coil of the split transformer to facilitate load use.

[0051] like Figure 2 As shown, Figure 2 The circuit diagram for generating an impedance change signal is shown. The primary coil, the first processing unit, and the signal conditioner constitute the stator-side circuit, while the secondary coil and the second processing unit constitute the rotor-side circuit. The second processing unit sends the acquired temperature signal data to the microcontroller minimum system, which can be understood as a control chip within the microcontroller. After processing by the microcontroller minimum system, the temperature signal data controls the switching transistor VT2, thereby connecting or disconnecting the resistor connected in series with VT2 from the circuit. This changes the equivalent impedance on the rotor side, causing a change in the current amplitude flowing through the secondary coil on the rotor side. This changes the load on the split transformer. Through the induced coupling between the primary and secondary coils of the split transformer, the current amplitude flowing through the primary coil on the stator side also changes, indicating a change in the stator load. This allows the temperature signal to be transmitted to the stator side of the split transmitter via current. The impedance change signal is extracted by filtering in the primary coil of the split transformer and finally conditioned by the first processing unit into a standard 4-20mA current signal.

[0052] The modulation characteristics of the signal transmission process are as follows:

[0053] (1) When the binary data is encoded as “0”, negative logic is used, the microcontroller minimum system outputs a high level, the switching transistor is turned on, and the current flows through the branch where the switching transistor is located.

[0054] (2) The equivalent impedance on the rotor side decreases, the load on the split transformer increases, and thus the amplitude of the current flowing through the secondary coil on the rotor side of the split transformer also increases.

[0055] (3) Through the coupling between the primary and secondary coils of the split transformer, the change in current amplitude is transmitted to the primary coil on the stator side, and the current amplitude of the primary coil also increases, and the load on the stator side of the split transmitter also increases.

[0056] (4) The stator side is connected to the adapter box through a wire. The current flowing through the long wire carries the data signal. The temperature signal in the current is detected by the voltage on the sampling diode. The signal is read by the demodulation work of the subsequent adapter box circuit using negative logic to complete the data transmission of the temperature signal and read the data "1".

[0057] The table below shows the correspondence between various physical quantities in the data transmission process:

[0058]

[0059] In use, the primary coil of the split transformer and the first processing unit are located on the stator side of the motor, while the secondary coil and the second processing unit are located on the rotor side. An external power supply provides the operating voltage for the temperature transmitter. When the first processing unit is working, it drives the primary coil to generate an alternating magnetic field, which induces an alternating electromotive force in the secondary coil, thus powering the second processing unit and the temperature sampling sensor. The temperature sampling sensor is connected to the motor rotor and can collect the rotor temperature in real time and generate a temperature signal. After receiving the temperature signal, the second processing unit generates an impedance change signal, which reflects the temperature signal data. At this time, the secondary coil transmits the impedance change signal to the first processing unit through electromagnetic induction, thereby realizing the real-time acquisition and transmission of the motor rotor temperature signal. Since the rotor-side circuit is powered by induced electromotive force, and the temperature signal is transmitted by electromagnetic induction by changing the current amplitude through impedance transformation, the two do not interfere with each other, resulting in higher measurement accuracy, better measurement effect, and a simpler overall circuit structure. No additional receiving and transmitting devices are required, resulting in lower cost.

[0060] Example 2

[0061] The difference between this embodiment and Embodiment 1 is that: in this embodiment, as Figure 4 As shown, the second processing unit includes: a rectifier and filter circuit connected to the secondary coil; an equivalent impedance changing switch circuit connected to the rectifier and filter circuit, the equivalent impedance changing switch circuit being used to sense temperature signals to change the input resistance value and generate impedance changing signals; a second voltage regulator circuit connected to the equivalent impedance changing switch circuit, the second voltage regulator circuit being used to regulate the alternating electromotive force to provide a stable voltage source to the load; a temperature acquisition circuit connected to the second voltage regulator circuit, the temperature acquisition circuit being connected to a temperature sampling sensor to acquire temperature signals; and a second microcontroller module connected to the temperature acquisition circuit, the second microcontroller module being connected to the second voltage regulator circuit and the equivalent impedance changing switch circuit.

[0062] During power supply, the secondary coil induces an alternating electromotive force, which is then rectified and filtered by the rectifier and filter circuit. The voltage is then regulated by the second voltage regulator circuit to provide stable power to the second microcontroller module, temperature acquisition circuit, and temperature sampling sensor. After the temperature sampling sensor acquires a temperature signal, the temperature acquisition circuit obtains the corresponding signal and sends it to the second microcontroller module for processing. This signal is then sent to the equivalent impedance changing switch circuit. Upon receiving the signal, the equivalent impedance changing switch circuit changes the input resistance value, generating an impedance change signal, which is then transmitted from the secondary coil to the primary coil via electromagnetic induction, thus achieving temperature signal acquisition and transmission.

[0063] Specifically, the rectifier filter circuit and the second voltage regulator circuit can use existing circuit structures, which will not be elaborated here. Figure 5 and Figure 6 As shown, the temperature acquisition circuit includes a temperature sampling chip and a sampling analog circuit connected to the temperature sampling chip. The sampling analog circuit includes several sampling branches corresponding to each temperature sampling sensor. Each sampling branch is connected to the temperature sampling chip through a low-pass filter. In this embodiment, the temperature sampling sensor uses a PT100 platinum resistance thermometer and is provided in four groups. The corresponding sampling analog circuit is provided with at least four sampling branches corresponding to each temperature sampling sensor. The temperature sampling chip uses a time-division multiplexing method to perform digital-to-analog conversion (ADC) on the four voltage signals. It switches between the four signals at a set frequency, samples the voltage signals of each channel in sequence, and amplifies and converts them into data signals to be transmitted to the second microcontroller module.

[0064] A constant current source is provided by a temperature sampling chip. After the temperature sampling sensor collects the temperature signal, it is converted into a voltage signal. After passing through a low-pass filter, high-frequency interference can be effectively suppressed. Each sampling branch can transmit the signal collected by each temperature sampling sensor to the temperature sampling chip, and then the temperature sampling chip performs the corresponding processing to complete the temperature sampling process.

[0065] like Figure 7 As shown, the second microcontroller module includes the MKE02Z64VL C2 chip and its peripheral circuitry, such as... Figure 8As shown, the equivalent impedance change switching circuit includes: a field-effect transistor U2 connected to the second microcontroller module, and a current-limiting resistor connected to the field-effect transistor U2. The field-effect transistor U2 turns on in response to the temperature signal to connect to the current-limiting resistor, generating an impedance change signal. The No. 1 interface of the field-effect transistor U2 is connected to the DRV interface of the PTB1 port of the MKE02Z64VL C2 chip. By turning the field-effect transistor U2 on and off, the current-limiting circuit is connected to or disconnected from the circuit, realizing the change of the equivalent resistance value in the circuit, thereby causing the current amplitude to change, which can form an impedance change signal. For example, when the field-effect transistor U2 is on, the current flows through this branch, which is equivalent to connecting a current-limiting resistor in parallel with the equivalent impedance on the rotor side. The equivalent impedance of the new circuit will be significantly reduced, and the circuit flowing through the secondary coil will be correspondingly increased.

[0066] like Figure 4 As shown, the first processing unit includes: a first voltage regulator circuit connected to an external power supply; a first microcontroller module connected to the first voltage regulator circuit; and an H-bridge driver connected to the first microcontroller module. The H-bridge driver is connected to the primary coil and the external power supply, and is used to invert the DC power supply into a variable frequency AC circuit to supply the primary coil so that the split transformer outputs a predetermined voltage value. The first voltage regulator circuit performs voltage regulation on the input voltage source, thereby providing stable power to the first microcontroller module. The H-bridge driver then inverts the DC power supply into a variable frequency AC circuit to supply the primary coil, so that the voltage output on the secondary coil side is only related to the turns ratio of the primary coil and the secondary coil. Therefore, after selecting a suitable turns ratio, a predetermined voltage value can be output.

[0067] Specifically, such as Figure 9 As shown, the first voltage regulator circuit includes two input terminals: a first input interface P1 and a second input interface P2. Both input interfaces P1 and P2 are long-wire interfaces. External power supplies power the first processing unit through these interfaces. A fast recovery diode D3 is connected to the first input interface P1 to prevent reverse connection of the power supply, thus avoiding damage to subsequent circuits caused by reversed polarity of the wires. A Zener diode D7 limits the voltage amplitude to 24V to prevent damage from overvoltage or pulse voltage. C6 is a tantalum capacitor for filtering. R18 acts as a voltage divider. The larger the voltage difference between the input and output voltages of the KA78M05RTM, the greater its power and the more severe the heat generation. Adding a voltage divider resistor significantly improves its heat generation.

[0068] like Figure 10 As shown, Figure 10 The circuit schematic of the first microcontroller module is shown, as follows: Figure 11 As shown, Figure 11 The circuit schematic of the H-bridge driver is shown, such as... Figure 12 As shown, Figure 12The equivalent circuit diagram of the H-bridge driver is shown. The H-bridge driver includes an H-bridge driver chip and its peripheral circuits, which can be equivalent to four sets of transistors connected in sequence. The H-bridge driver chip uses a MAX13256 microcontroller, which has a built-in clock, but an external clock is used in this embodiment. The CLK pin is connected to a 2MHz clock supplied by the first microcontroller module to drive the H-bridge driver. The internal flip-flop divides the external clock by two to ensure that the duty cycle of the generated switching signal is 50%. Therefore, the frequency of the AC power supply output by the driver is half of the frequency of the external clock supplied by the first microcontroller module, which is 1MHz.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A non-contact power-supplied rotary multipath temperature transmitter, characterized by, The application relates to a motor temperature sampling and regulating system, which comprises the following parts: a separation transformer, which comprises a primary coil and a secondary coil coupled with each other, the primary coil is arranged on the stator side of a motor, and the secondary coil is arranged on the rotor side of the motor; a first processing unit connected with the primary coil, the first processing unit is connected with an external power supply, and the first processing unit is used for driving the primary coil to generate an alternating magnetic field so as to make the secondary coil generate an alternating electromotive force; a second processing unit connected with the secondary coil, the second processing unit is connected with a plurality of temperature sampling sensors, the temperature sampling sensors are used for sampling the temperature signal of the motor rotor in real time, and the second processing unit generates an impedance change signal reflecting the temperature signal data in response to the temperature signal so as to make the secondary coil send the impedance change signal to the first processing unit through the primary coil in an electromagnetic induction mode; the second processing unit comprises: a rectification filter circuit connected with the secondary coil; an equivalent impedance change switch circuit connected with the rectification filter circuit, the equivalent impedance change switch circuit is used for sensing the temperature signal to change the access resistance value and generate the impedance change signal; a second voltage stabilizing circuit connected with the equivalent impedance change switch circuit, the second voltage stabilizing circuit is used for stabilizing the alternating electromotive force to provide a stable voltage source for a load; a temperature acquisition circuit connected with the second voltage stabilizing circuit, the temperature acquisition circuit is connected with the temperature sampling sensors and used for acquiring the temperature signal; a second single-chip microcomputer module connected with the temperature acquisition circuit, the second single-chip microcomputer module is connected with the second voltage stabilizing circuit and the equivalent impedance change switch circuit; the temperature acquisition circuit comprises a temperature sampling chip and a sampling analog circuit connected with the temperature sampling chip, the sampling analog circuit comprises a plurality of sampling branches corresponding to the temperature sampling sensors, and each sampling branch is connected with the temperature sampling chip through a low-pass filter; the equivalent impedance change switch circuit comprises a field effect transistor connected with the second single-chip microcomputer module and a current limiting resistor connected with the field effect transistor, the field effect transistor is turned on in response to the temperature signal to access the current limiting resistor and generate the impedance change signal.

2. The non-contact powered rotating multipath temperature transmitter of claim 1, wherein, the first processing unit comprises: a first voltage stabilizing circuit connected with an external power supply; a first single-chip microcomputer module connected with the first voltage stabilizing circuit; and an H-bridge driver connected with the first single-chip microcomputer module, the H-bridge driver is connected with the primary coil and the external power supply, and is used for inverting the direct current power into an alternating current circuit with variable frequency to supply the primary coil so as to make the separation transformer output a predetermined voltage value.

3. The non-contact powered rotating multipath temperature transmitter of claim 2, wherein, the first voltage stabilizing circuit comprises a first input interface and a second input interface, the first input interface is connected with a fast recovery diode, and the anode end of the fast recovery diode is connected with the first input interface.

4. The non-contact powered rotating multipath temperature transmitter of claim 2, wherein, the H-bridge driver comprises an H-bridge driving chip.

5. The non-contact powered rotating multipath temperature transmitter of claim 1, wherein, the temperature sampling sensors adopt PT100 platinum resistance.

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