CN117784686A - Digital suspension controller system for cable production equipment - Google Patents
Digital suspension controller system for cable production equipment Download PDFInfo
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- CN117784686A CN117784686A CN202311810447.0A CN202311810447A CN117784686A CN 117784686 A CN117784686 A CN 117784686A CN 202311810447 A CN202311810447 A CN 202311810447A CN 117784686 A CN117784686 A CN 117784686A
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Abstract
The invention discloses a digital suspension controller system for cable production equipment, which relates to the field of cable production, and comprises the following components: the transmitting plate is used for driving the transmitting coil to generate electromagnetic wave signals; the transmitting coil is used for transmitting sine electromagnetic wave signals with the amplitude of 15V and the frequency of 150KHZ, the receiving coil is used for receiving the sine electromagnetic wave signals transmitted by the wire core through the magnetic conduction effect of the wire core in the vulcanizing tube, and the upper receiving coil and the lower receiving coil output 150KHZ voltage signals with different sizes according to the distance between the wire core and the upper receiving coil and the lower receiving coil and supply the voltage signals to the receiving plate; the beneficial effects of the invention are as follows: the transmitting plate and the receiving plate use patch type electronic components, so that the problems of short service life, poor anti-interference capability and low yield of a suspension system caused by the problems of welding, chip quality and the like are reduced; the DDS chip is used by the transmitting plate, so that the frequency accuracy and the frequency stability are high.
Description
Technical Field
The invention relates to the field of cable production, in particular to a digital suspension controller system for cable production equipment.
Background
In the catenary crosslinked cable production line, the control wire core is required to be in a catenary state in the vulcanizing pipe, and the whole production process cannot be contacted with the pipe wall. The suspension controller can send a control signal to the lower tractor by detecting the position of the wire core, finely adjust the rotating speed of the lower tractor, and the control wire core is always kept near the middle position of the vulcanizing tube.
In the prior art, an analog device is generally used for generating a sine wave excitation signal to excite a transmitting coil, so that the frequency accuracy and stability are poor, and improvement is needed.
Disclosure of Invention
The present invention aims to provide a digital suspension controller system for a cable production plant, which solves the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a digital pendant controller system for a cable production facility, comprising:
the transmitting plate is used for driving the transmitting coil to generate electromagnetic wave signals;
a transmitting coil for transmitting a sinusoidal electromagnetic wave signal with amplitude of 15V and frequency of 150KHZ,
the upper receiving coil and the lower receiving coil are used for receiving sine electromagnetic wave signals transmitted by the wire core through the magnetic conduction effect of the wire core in the vulcanizing tube (metal tube), and the upper receiving coil and the lower receiving coil output 150KHZ voltage signals with different sizes according to the distance between the upper receiving coil and the wire core and supply the voltage signals to the receiving plate;
the receiving plate is used for detecting the voltage signal intensity with the frequency of 150KHZ in the upper receiving coil and the lower receiving coil, carrying out differential amplification, obtaining differential amplification voltage signals and outputting the differential amplification voltage signals to the signal conditioning plate;
the signal conditioning plate is used for amplifying the voltage signal according to the difference and controlling the working state of the lower traction driver;
the lower traction driver is used for driving the lower traction machine to work according to the control signal during work;
the lower traction machine is used for traction of the wire core, so that the wire core is in a catenary state in the vulcanizing pipe;
the transmitting plate is connected with the transmitting coil, the transmitting coil is fixed at the front end of the vulcanizing tube and insulated with the vulcanizing tube, the two receiving coils are fixed at the rear end of the vulcanizing tube, and the two receiving coils are vertically and symmetrically fixed on the vulcanizing tube in the horizontal direction, have equal inductance values and are also insulated with the vulcanizing tube; the receiving coil is connected with the receiving plate, the receiving plate is connected with the signal conditioning plate, the signal conditioning plate is connected with the lower traction driver, and the lower traction driver is connected with the lower tractor.
As still further aspects of the invention: the transmitting board comprises a microcontroller MCU1, a DDS chip, an operational amplifier A and a power amplifier, wherein an SPI port of the microcontroller MCU1 is connected with an input end of the DDS chip, an output end of the DDS chip is connected with an input end of the operational amplifier A, an output end of the operational amplifier A is connected with an input end of the power amplifier, an output end of the power amplifier is connected with one end of a transmitting coil, an anode of a diode D101, the other end of the transmitting coil is grounded, a cathode of the diode D101 is connected with one end of a resistor R101, the other end of the resistor R101 is connected with one end of a resistor R102, one end of a capacitor C101 is connected with an AIN port of the microcontroller MCU1, the other end of the resistor R102 is grounded, and the other end of the capacitor C101 is grounded, and a GPIO port of the microcontroller MCU1 is connected with an LED indicator lamp.
As still further aspects of the invention: the receiving plate includes:
the demodulation circuit is used for receiving the voltage signals with the frequency of 150KHZ and different sizes output by the upper receiving coil and the lower receiving coil, and obtaining a modulation signal after demodulation;
the square wave generating and sampling and holding circuit is used for completing voltage signal demodulation through a 100HZ switching signal SIG-DIV auxiliary demodulation circuit, obtaining voltage amplitude signals Volt-L and Volt-R in the upper and lower receiving coils after sampling the demodulation signals, and sending the voltage amplitude signals Volt-L and Volt-R into the operation circuit;
the operation circuit is used for carrying out difference amplification on the voltage amplitude signals Volt-L and Volt-R, obtaining difference amplified voltage signals and outputting the difference amplified voltage signals to the micro controller MCU2;
the MCU2 is used for reading the differential amplification voltage signal and outputting the differential amplification voltage signal to the nixie tube display circuit and the signal output circuit;
the nixie tube display circuit is used for displaying the size of the differential amplification voltage signal;
the signal output circuit is used for outputting the differential amplification voltage signal to the signal conditioning board;
the first input end of the demodulation circuit is connected with the upper receiving coil and the lower receiving coil, the second input end of the demodulation circuit is connected with the first output end of the square wave generating and sampling and holding circuit, the output end of the demodulation circuit is connected with the input end of the square wave generating and sampling and holding circuit, the second output end of the square wave generating and sampling and holding circuit is connected with the input end of the operation circuit, the output end of the operation circuit is connected with the AIN port of the micro controller MCU2, the GPIO port of the micro controller MCU2 is connected with the input end of the nixie tube display circuit, the SPI port of the micro controller MCU2 is connected with the input end of the signal output circuit, and the output end of the signal output circuit is connected with the signal conditioning plate.
As still further aspects of the invention: the demodulation circuit comprises a coupling inductor CT1, a coupling inductor CT2, a coupling inductor CT3, an analog multiplier and an intermediate frequency AM demodulator, wherein the model of the analog multiplier is MC1496, and the model of the intermediate frequency AM demodulator is TDA1046;
one end of the input side of the coupling inductor CT2 is connected with one end of the upper receiving coil, the other end of the upper receiving coil is grounded, the other end of the input side of the coupling inductor CT2 is grounded, one end of the output side of the coupling inductor CT2 is connected with 5V voltage, the other end of the output side of the coupling inductor CT2 is connected with one end of a capacitor C19 and the SIN+ end of the analog multiplier, and the other end of the capacitor C19 is connected with 5V voltage;
one end of the input side of the coupling inductor CT3 is connected with one end of the lower receiving coil, the other end of the lower receiving coil is grounded, the other end of the input side of the coupling inductor CT3 is grounded, one end of the output side of the coupling inductor CT3 is connected with 5V voltage, the other end of the output side of the coupling inductor CT3 is connected with one end of a capacitor C25 and the SIN-end of an analog multiplier, and the other end of the capacitor C25 is connected with 5V voltage;
the CIN-end of the analog multiplier is connected with 10V voltage, the CIN+ end of the analog multiplier is connected with one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R3 is grounded, the other end of the resistor R2 is connected with the first output end of the square wave generating and sampling and holding circuit, the VEE end of the analog multiplier is grounded, the OUT+ end of the analog multiplier is connected with one end of a capacitor C14 and one end of the input side of a coupling inductor CT1, the OUT-end of the analog multiplier is connected with the other end of the capacitor C14, 15V voltage and the other end of the input side of the coupling inductor CT1, one end of the output side of the coupling inductor CT1 is grounded, the other end of the output side of the coupling inductor CT1 is connected with the FI-end of the intermediate frequency AM demodulator through a capacitor C11, the UQNF end of the intermediate frequency AM demodulator is connected with one end of a capacitor C15 and the same-phase end of an operational amplifier A1, the other end of the capacitor C15 is grounded, the opposite-phase end of the operational amplifier A1 is connected with the input end of a square wave generating and sampling and holding circuit, the output end of the operational amplifier A1 and one end of a resistor R8, the other end of the resistor R8 is connected with the same-phase end of an operational amplifier A2, the opposite-phase end of the operational amplifier A2 is connected with the positive electrode of a voltage stabilizing diode DZ1, the negative electrode of the voltage stabilizing diode DZ1 is connected with the output end of the operational amplifier A2 and one end of a resistor R14, and the other end of the resistor R14 is connected with one end of a capacitor C22 and the ZFRV1 end of the intermediate frequency AM demodulator.
As still further aspects of the invention: the square wave generating and sampling hold circuit comprises a counter, an analog switch and a Schmitt trigger, wherein the counter is of a model CD4017, the analog switch is of a model CD4016, the Schmitt trigger is of a model CD40106, the Schmitt trigger, a resistor R19 and a capacitor C29 form an RC oscillating circuit, the output end of the RC oscillating circuit is connected with the input end of the other Schmitt trigger, the output end of the other Schmitt trigger is connected with the CLK end of the counter, the CO end of the counter is connected with the second input end of the demodulation circuit, the 3 end of the counter is connected with the positive electrode of a diode D1, the 4 end of the counter is connected with the positive electrode of a diode D2, the negative electrode of the diode D1 is connected with the S0 end of the negative analog switch of the diode D2, the positive pole of diode D3 is connected to 8 ends of counter, the positive pole of diode D4 is connected to 9 ends of counter, the negative pole of diode D3 is connected to the negative pole of diode D4, analog switch 'S S1 end, analog switch' S IO0, the output of demodulation circuit is connected to IO1 end, analog switch 'S OI0 end is connected with one end of resistance R21, the homophase end of operational amplifier A3 is connected to the other end of resistance R21, the output of operational amplifier A3 is connected to the inverting terminal of operational amplifier A3, the input of operational circuit, the one end of resistance R31 is connected to analog switch' S OI1 end, the homophase end of operational amplifier A4 is connected to the other end of resistance R31, the output of operational amplifier A4 is connected to the inverting terminal of operational amplifier A4, the input of operational circuit.
As still further aspects of the invention: the operational circuit comprises an instrument amplifier, the model of the instrument amplifier is AD8220, the IN+ end of the instrument amplifier is connected with the output end of an operational amplifier A6 and one end of a resistor R32, the other end of the resistor R32 is connected with one end of a resistor R33 and the inverting end of the operational amplifier A6, the other end of the resistor R33 is connected with the sliding end of a potentiometer RP3, one end of the potentiometer RP3 is connected with 5V voltage, the other end of the potentiometer RP3 is grounded, and the IN-phase end of the operational amplifier A6 is connected with the second output end of the square wave generating and sampling and holding circuit through a resistor R28; the IN-end of the instrumentation amplifier is connected with the output end of the operational amplifier A5 and one end of the resistor R18, the other end of the resistor R18 is connected with one end of the resistor R17 and the inverting end of the operational amplifier A5, the other end of the resistor R17 is connected with the sliding end of the potentiometer RP1, one end of the potentiometer RP1 is connected with 5V voltage, the other end of the potentiometer RP1 is grounded, and the IN-phase end of the operational amplifier A5 is connected with the second output end of the square wave generating and sampling and holding circuit through the resistor R20; the REF end of the instrument amplifier is connected with the sliding end of the potentiometer RP2, one end of the potentiometer RP2 is connected with 5V voltage, the other end of the potentiometer RP2 is grounded, and the VOUT end of the instrument amplifier is connected with the AIN port of the microcontroller MCU 2.
As still further aspects of the invention: the signal output circuit comprises a DAC chip and an amplifying chip, wherein the DAC chip is of a DAC60501 type, the amplifying chip is of a LM7332 type, the DIN, SYNC, SCLK end of the DAC chip is connected with the SPI port of the micro-controller MCU2, the output end of the DAC chip is connected with one end of a resistor R51, the other end of the resistor R51 is connected with one end of a resistor R56 and the same-phase end of an operational amplifier A7, the other end of the resistor R56 is connected with one end of a resistor R63 and one end of a resistor R64, the other end of the resistor R63 is connected with-5V voltage, the other end of the resistor R64 is grounded, the inverting end of the operational amplifier A7 is connected with one end of the resistor R48 and one end of the resistor R41, the other end of the resistor R48 is grounded, the other end of the resistor R41 is connected with the output end of the operational amplifier A7, one end of the resistor R52 and one end of the resistor R57 are connected with the first same-phase end of the amplifying chip, one end of the resistor R42 and one end of the resistor R43 are grounded, the other end of the resistor R42 is connected with the first output end of the amplifying chip, the other end of the resistor R43 is connected with the second end of the amplifying chip is grounded, and the other end of the inverting end of the resistor R62 is connected with the first output end of the amplifying chip is grounded.
Compared with the prior art, the invention has the beneficial effects that: the transmitting plate and the receiving plate use patch type electronic components with stable performance and high product consistency in recent years, so that the problems of short service life, poor anti-interference capability and low yield of a suspension system caused by the problems of welding, chip quality and the like are reduced;
the transmitting board uses a DDS chip (direct digital frequency synthesis) to realize the generation of intermediate frequency sine waves, and replaces the existing analog oscillation single-way; the frequency accuracy and the frequency stability are high, the sine wave waveform standard ensures that the frequency band is narrower, the higher harmonic is small, the energy utilization rate is high, the signal-to-noise ratio of the signal received by the receiving end is increased, and the anti-interference capability of the suspension system is improved;
compared with the prior art, the receiving board has the advantages that the initial signal is subjected to secondary frequency selection by the demodulation circuit and secondary amplification, the signal to noise ratio is improved, the operation circuit is provided with multi-gear output, the display function of output voltage and a plurality of zero point adjusting ports are increased, and the installation and debugging difficulty and the product adaptability are simplified.
Drawings
Fig. 1 is a block diagram of a digital pendant controller system for a cable production facility.
Fig. 2 is a functional block diagram of a transmitting plate.
Fig. 3 is a functional block diagram of a receiving board.
Fig. 4 is a schematic diagram of a demodulation circuit of the receiving board.
Fig. 5 is a schematic diagram of a square wave generation and sample and hold circuit of a receiver board.
Fig. 6 is a schematic diagram of an arithmetic circuit of the receiving board.
Fig. 7 is a schematic diagram of a signal output circuit of the receiving board.
Fig. 8 is a schematic diagram of a nixie tube display circuit of the receiving board.
Fig. 9 is a schematic diagram of a power circuit of the receiver board.
Fig. 10 is a signal timing diagram of a receiving board.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, a digital pendant controller system for a cable production facility, comprising:
the transmitting plate is used for driving the transmitting coil to generate electromagnetic wave signals;
a transmitting coil for transmitting a sinusoidal electromagnetic wave signal with amplitude of 15V and frequency of 150KHZ,
the upper receiving coil and the lower receiving coil are used for receiving sine electromagnetic wave signals transmitted by the wire core through the magnetic conduction effect of the wire core in the vulcanizing tube (metal tube), and the upper receiving coil and the lower receiving coil output 150KHZ voltage signals with different sizes according to the distance between the upper receiving coil and the wire core and supply the voltage signals to the receiving plate;
the receiving plate is used for detecting the voltage signal intensity with the frequency of 150KHZ in the upper receiving coil and the lower receiving coil, carrying out differential amplification, obtaining differential amplification voltage signals and outputting the differential amplification voltage signals to the signal conditioning plate;
the signal conditioning plate is used for amplifying the voltage signal according to the difference and controlling the working state of the lower traction driver;
the lower traction driver is used for driving the lower traction machine to work according to the control signal during work;
the lower traction machine is used for traction of the wire core, so that the wire core is in a catenary state in the vulcanizing pipe;
the transmitting plate is connected with the transmitting coil, the transmitting coil is fixed at the front end of the vulcanizing tube and insulated with the vulcanizing tube, the two receiving coils are fixed at the rear end of the vulcanizing tube, and the two receiving coils are vertically and symmetrically fixed on the vulcanizing tube in the horizontal direction, have equal inductance values and are also insulated with the vulcanizing tube; the receiving coil is connected with the receiving plate, the receiving plate is connected with the signal conditioning plate, the signal conditioning plate is connected with the lower traction driver, and the lower traction driver is connected with the lower tractor.
In particular embodiments: in the existing suspension technology, a sine wave excitation signal is usually generated by using an analog device to excite a transmitting coil, and the frequency accuracy and stability are poor; the receiving circuit on the receiving board is built by the analog device as well, various circuit parameters need to be adjusted during debugging, an additional tool is used for detecting output signals, the receiving board of the transmitting board often adopts direct-insert electronic components, the anti-interference capability of the circuit board is poor, and quality problems caused by infirm welding are easy to occur.
The invention develops a suspension system which uses (DDS) direct digital frequency synthesis technology to generate excitation signals, detects the position of a wire core in a vulcanization tube of a crosslinked cable production line by detecting a receiving coil signal through an envelope detection technology after secondary frequency selection and amplification, feeds voltage signals reflecting position information into a signal conditioning plate, adjusts the rotating speed of a lower tractor after PID calculation in the conditioning plate, and controls the wire core to be positioned in the middle position of the vulcanization tube. A large number of digital circuits are used in the transmitting board and the receiving board, the output voltage is monitored in real time by utilizing a singlechip (microcontroller), necessary information of an operator is prompted through an LED or a nixie tube, and the transmitting board and the receiving board adopt patch components, so that the device has the advantages of high reliability, convenience in debugging, strong anti-interference capability and good expansibility. The signal conditioning board is a control board for realizing PID calculation, can be realized by a full analog circuit or an analog-digital combined circuit, has certain universality in the industrial field, and the suspension system disclosed by the invention focuses on core position detection, so that the signal conditioning board is not described later.
The transmitting coil is fixed at the front end of the vulcanizing tube, has an inductance value of about 70uh and is insulated from the vulcanizing tube. The two receiving coils are fixed at the rear end of the vulcanizing tube, are vertically symmetrical to the vulcanizing tube in the horizontal direction and are fixed, the inductance value is equal and is about 20uh, and the receiving coils are also insulated with the vulcanizing tube. The transmitting plate drives the transmitting coil to generate an intermediate frequency electromagnetic wave signal, and the driving signal is a sine wave with the amplitude of 15V and the frequency of 150 KHZ; because of the magnetic conduction effect of the wire core in the vulcanizing tube, the upper receiving coil and the lower receiving coil receive sine wave electromagnetic signals transmitted by the wire core, the amplitude of induced voltage signals is positively correlated with the distance between the wire core and the coils, and the signal intensity of 150KHZ frequency in the two receiving coils is detected by the receiving plate and is differed, so that the position deviation of the wire core in the vulcanizing tube is estimated.
In this embodiment: referring to fig. 2, the transmitting board includes a microcontroller MCU1, a DDS chip, an operational amplifier a, and a power amplifier, where an SPI port of the microcontroller MCU1 is connected to an input end of the DDS chip, an output end of the DDS chip is connected to an input end of the operational amplifier a, an output end of the operational amplifier a is connected to an input end of the power amplifier, an output end of the power amplifier is connected to one end of a transmitting coil, an anode of a diode D101, another end of the transmitting coil is grounded, a cathode of the diode D101 is connected to one end of a resistor R101, another end of the resistor R101 is connected to one end of a resistor R102, one end of a capacitor C101 is connected to an AIN port of the microcontroller MCU1, another end of the resistor R102 is grounded, and another end of the capacitor C101 is grounded, and a GPIO port of the microcontroller MCU1 is connected to an LED indicator.
The DDS (direct digital frequency synthesis) chip is driven by a microcontroller MCU1 (microcontroller, namely a singlechip) to generate a sine wave with the frequency of 150KHZ, the sine wave is amplified by an operational amplifier A and then is sent into a power amplifier, and a voltage driving signal with the amplitude of about 14V and the frequency of 150KHZ is output to a transmitting coil. Meanwhile, the output voltage is monitored through an ADC (analog-digital converter) carried by the MCU1, and if the voltage amplitude is abnormal, the error is reported through an LED indicator lamp.
In this embodiment: referring to fig. 3 and 10, the receiving plate includes:
the demodulation circuit is used for receiving the voltage signals with the frequency of 150KHZ and different sizes output by the upper receiving coil and the lower receiving coil, and obtaining a modulation signal after demodulation;
the square wave generating and sampling and holding circuit is used for completing voltage signal demodulation through a 100HZ switching signal SIG-DIV auxiliary demodulation circuit, obtaining voltage amplitude signals Volt-L and Volt-R in the upper and lower receiving coils after sampling the demodulation signals, and sending the voltage amplitude signals Volt-L and Volt-R into the operation circuit;
the operation circuit is used for carrying out difference amplification on the voltage amplitude signals Volt-L and Volt-R, obtaining difference amplified voltage signals and outputting the difference amplified voltage signals to the micro controller MCU2;
the MCU2 is used for reading the differential amplification voltage signal and outputting the differential amplification voltage signal to the nixie tube display circuit and the signal output circuit;
the nixie tube display circuit is used for displaying the size of the differential amplification voltage signal;
the signal output circuit is used for outputting the differential amplification voltage signal to the signal conditioning board;
the first input end of the demodulation circuit is connected with the upper receiving coil and the lower receiving coil, the second input end of the demodulation circuit is connected with the first output end of the square wave generating and sampling and holding circuit, the output end of the demodulation circuit is connected with the input end of the square wave generating and sampling and holding circuit, the second output end of the square wave generating and sampling and holding circuit is connected with the input end of the operation circuit, the output end of the operation circuit is connected with the AIN port of the micro controller MCU2, the GPIO port of the micro controller MCU2 is connected with the input end of the nixie tube display circuit, the SPI port of the micro controller MCU2 is connected with the input end of the signal output circuit, and the output end of the signal output circuit is connected with the signal conditioning plate.
The upper receiving coil and the lower receiving coil receive electromagnetic wave signals from 150KHZ from a transmitting coil conducted by a wire core, the signal intensity sensed in the receiving coil is positively related to the distance between the receiving coil and the wire core, the frequency of the sensed signals in the receiving coil is 150KHZ, the envelope line reflects the signal intensity of the signals, in order to extract the voltage amplitude of the signal envelope, the signals are regarded as modulated signals with the amplitude of 150KHZ, the carrier wave is modulated signals with the modulation circuit and the modulation circuit is demodulated to obtain modulated signals, namely the signal intensity from the transmitting coil conducted by the wire core sensed in the receiving coil, the square wave generating and sampling and holding circuit demodulates the voltage signals in the two coils through a switching signal SIG-DIV multiplexing demodulation circuit with the frequency of 100HZ, the voltage amplitude signals Volt-L and Volt-R in the two coils are obtained after sampling and holding, the voltage amplitude signals are fed into an operation circuit for differencing and amplifying, the voltage difference is read out through an ADC in a microcontroller MUC2, and the voltage difference is output through a signal output circuit and displayed in a nixie tube display circuit.
In this embodiment: referring to fig. 4, the demodulation circuit includes a coupling inductor CT1, a coupling inductor CT2, a coupling inductor CT3, an analog multiplier, and an intermediate frequency AM demodulator, wherein the model of the analog multiplier is MC1496, and the model of the intermediate frequency AM demodulator is TDA1046;
one end of the input side of the coupling inductor CT2 is connected with one end of the upper receiving coil, the other end of the upper receiving coil is grounded, the other end of the input side of the coupling inductor CT2 is grounded, one end of the output side of the coupling inductor CT2 is connected with 5V voltage, the other end of the output side of the coupling inductor CT2 is connected with one end of a capacitor C19 and the SIN+ end of the analog multiplier, and the other end of the capacitor C19 is connected with 5V voltage;
one end of the input side of the coupling inductor CT3 is connected with one end of the lower receiving coil, the other end of the lower receiving coil is grounded, the other end of the input side of the coupling inductor CT3 is grounded, one end of the output side of the coupling inductor CT3 is connected with 5V voltage, the other end of the output side of the coupling inductor CT3 is connected with one end of a capacitor C25 and the SIN-end of an analog multiplier, and the other end of the capacitor C25 is connected with 5V voltage;
the CIN-end of the analog multiplier is connected with 10V voltage, the CIN+ end of the analog multiplier is connected with one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R3 is grounded, the other end of the resistor R2 is connected with the first output end of the square wave generating and sampling and holding circuit, the VEE end of the analog multiplier is grounded, the OUT+ end of the analog multiplier is connected with one end of a capacitor C14 and one end of the input side of a coupling inductor CT1, the OUT-end of the analog multiplier is connected with the other end of the capacitor C14, 15V voltage and the other end of the input side of the coupling inductor CT1, one end of the output side of the coupling inductor CT1 is grounded, the other end of the output side of the coupling inductor CT1 is connected with the FI-end of the intermediate frequency AM demodulator through a capacitor C11, the UQNF end of the intermediate frequency AM demodulator is connected with one end of a capacitor C15 and the same-phase end of an operational amplifier A1, the other end of the capacitor C15 is grounded, the opposite-phase end of the operational amplifier A1 is connected with the input end of a square wave generating and sampling and holding circuit, the output end of the operational amplifier A1 and one end of a resistor R8, the other end of the resistor R8 is connected with the same-phase end of an operational amplifier A2, the opposite-phase end of the operational amplifier A2 is connected with the positive electrode of a voltage stabilizing diode DZ1, the negative electrode of the voltage stabilizing diode DZ1 is connected with the output end of the operational amplifier A2 and one end of a resistor R14, and the other end of the resistor R14 is connected with one end of a capacitor C22 and the ZFRV1 end of the intermediate frequency AM demodulator.
The upper receiving coil and the lower receiving coil are connected into adjustable coupling inductors CT2 and CT3, the coupling inductor CT2 and a capacitor C19, and the coupling inductor CT3 and the capacitor C25 respectively form an LC resonant circuit, and the resonant frequency is as follows:
the working frequency of the transmitting coil is 150kHz, the capacitances C19 and C25 are 28.8nF, and the resonant frequency is about 150kHz when the output sides of the coupling inductors CT2 and CT3 are 39 mu H, so that the frequency selection effect is realized.
The analog multiplier MC1496 multiplies the two paths of resonance signals with the 10V direct current signal to further realize amplification. The SIG-DIV is a square wave signal with the 100Hz duty ratio of 50%, the waveform is shown in figure 10, the variation of the SIG-DIV enables the MC1496 to output two paths of resonance signals respectively, the primary of the coupling inductor CT1 and the capacitor C14 form an LC resonance circuit, the resonance frequency is 150kHz, the output signal of the MC1496 is further selected in frequency, the timing diagram of the output signal Volt-A is shown in figure 10, namely, the amplitude modulation signal, the carrier frequency is 150kHz, and the modulated signal frequency is 100Hz. The intermediate frequency amplitude demodulator TDA1046 performs demodulation of the signal Volt-a to demodulate the envelope Volt-C of the Volt-a signal, the timing diagram of the signal Volt-C being shown in fig. 10. The amplitude value Volt-L of Volt-C at the high level moment of SIG-DIV represents the signal intensity of the upper receiving coil, the amplitude value Volt-R of Volt-C at the low level moment of SIG-DIV represents the signal intensity of the lower receiving coil, and the position of the crosslinked cable can be judged according to the values of Volt-L and Volt-R.
In this embodiment: referring to fig. 5 and 10, the square wave generating and sample holding circuit includes a counter, an analog switch, a schmitt trigger, the counter model is CD4017, the analog switch model is CD4016, the schmitt trigger model is CD40106, the schmitt trigger, the resistor R19, and the capacitor C29 form an RC oscillating circuit, an output end of the RC oscillating circuit is connected to an input end of another schmitt trigger, an output end of the other schmitt trigger is connected to a CLK end of the counter, a CO end of the counter is connected to a second input end of the demodulation circuit, A3 end of the counter is connected to an anode of the diode D1, A4 end of the counter is connected to an anode of the diode D2, a cathode of the diode D1 is connected to an S0 end of the cathode analog switch of the diode D2, the positive pole of diode D3 is connected to 8 ends of counter, the positive pole of diode D4 is connected to 9 ends of counter, the negative pole of diode D3 is connected to the negative pole of diode D4, analog switch 'S S1 end, analog switch' S IO0, the output of demodulation circuit is connected to IO1 end, analog switch 'S OI0 end is connected with one end of resistance R21, the homophase end of operational amplifier A3 is connected to the other end of resistance R21, the output of operational amplifier A3 is connected to the inverting terminal of operational amplifier A3, the input of operational circuit, the one end of resistance R31 is connected to analog switch' S OI1 end, the homophase end of operational amplifier A4 is connected to the other end of resistance R31, the output of operational amplifier A4 is connected to the inverting terminal of operational amplifier A4, the input of operational circuit.
The schmitt trigger CD40106, the capacitor C29 and the resistor R19 form an RC oscillating circuit, and the oscillating frequency is as follows:
normally, between k=0.8 and 2.0, when r19=47 kΩ and c29=22nf, the output CLK frequency is 1kHz, and the timing chart of the signal CLK is shown in fig. 10.
CD4017 is a 10-bit counter, SIG-DIV is a 10-divided signal of CLK, the frequency is 100Hz, and the timing diagram of SIG-DIV is shown in FIG. 10. The diodes D1, D2, D3, D4 constitute OR logic, resulting in signals EN-L and EN-R, the signal timing diagram of which is shown in FIG. 10. EN-L and EN-R respectively control two paths of switches of the multipath analog switch CD4016, the Volt-C signal is respectively selected by the high level of EN-L and EN-R to turn on the analog switch, and the analog switch outputs two paths of signals which are sent into a sample and hold circuit formed by operational amplifiers A3 and A4 to obtain signals Volt-L and Volt-R.
In this embodiment: referring to fig. 6, the operational circuit includes an instrumentation amplifier, the model of the instrumentation amplifier is AD8220, the in+ end of the instrumentation amplifier is connected to the output end of the operational amplifier A6, one end of the resistor R32, the other end of the resistor R32 is connected to one end of the resistor R33, the inverting end of the operational amplifier A6, the other end of the resistor R33 is connected to the sliding end of the potentiometer RP3, one end of the potentiometer RP3 is connected to 5V voltage, the other end of the potentiometer RP3 is grounded, and the IN-phase end of the operational amplifier A6 is connected to the second output end of the square wave generating and sampling holding circuit through the resistor R28; the IN-end of the instrumentation amplifier is connected with the output end of the operational amplifier A5 and one end of the resistor R18, the other end of the resistor R18 is connected with one end of the resistor R17 and the inverting end of the operational amplifier A5, the other end of the resistor R17 is connected with the sliding end of the potentiometer RP1, one end of the potentiometer RP1 is connected with 5V voltage, the other end of the potentiometer RP1 is grounded, and the IN-phase end of the operational amplifier A5 is connected with the second output end of the square wave generating and sampling and holding circuit through the resistor R20; the REF end of the instrument amplifier is connected with the sliding end of the potentiometer RP2, one end of the potentiometer RP2 is connected with 5V voltage, the other end of the potentiometer RP2 is grounded, and the VOUT end of the instrument amplifier is connected with the AIN port of the microcontroller MCU 2.
Because the upper receiving coil and the lower receiving coil are different, the external environment is different, when the crosslinked cable is positioned at the middle position, the values of Volt-L and Volt-R are possibly different, therefore, an arithmetic circuit is required to carry out zero setting operation, in addition, because of the uncertainty of the power of a transmitting coil, the change of the distance between the receiving coil and the transmitting coil and the uncertainty of the influence of the external environment on the magnetic field intensity, the amplification factor of a receiving signal is required to be adjusted to ensure the reading range of the analog voltage of an ADC port of a microcontroller.
The operational amplifiers A5 and A6 are two subtracting circuits, subtracting one bias voltage from Volt-L and Volt-R, respectively, namely:
wherein V is REF-L And V REF-R The adjustment is carried out by potentiometers RP1 and RP3, and the adjustment range is between 0 and 5V.
V LO And V RO Sending into an instrument amplifier AD8220 for subtraction and amplification, and connecting a potentiometer RP2 at the REF end of the AD8220 for further zeroing, adjusting the range to 0-5V, and outputting a voltage V AIN Can be expressed as:
V AIN ＝G(V RO -V LO )+V REF-O (4)
wherein G is the amplification factor of AD8220, and the amplification formula is:
wherein R is G The gain control resistor connected with the AD8220 is controlled by resistors R23, R24, R25 and a 2-bit dial switch, the amplification factor is adjustable in 4 steps, the gain control resistor is controlled by the 2-bit dial switch, and the amplification factor is shown in the table 1:
i.e. the magnification is 2 times, 3 times, 4 times and 5 times, respectively.
In this embodiment: referring to fig. 7, the signal output circuit includes a DAC chip and an amplifying chip, the DAC chip is of the type DAC60501, the amplifying chip is of the type LM7332, the DIN, SYNC, SCLK end of the DAC chip is connected to the SPI port of the microcontroller MCU2, the output end of the DAC chip is connected to one end of the resistor R51, the other end of the resistor R51 is connected to one end of the resistor R56 and the in-phase end of the operational amplifier A7, the other end of the resistor R56 is connected to one end of the resistor R63, the other end of the resistor R63 is connected to-5V voltage, the other end of the resistor R64 is grounded, the inverting end of the operational amplifier A7 is connected to one end of the resistor R48 and one end of the resistor R41, the other end of the resistor R48 is grounded, the other end of the resistor R41 is connected to the output end of the operational amplifier A7, one end of the resistor R52 and one end of the resistor R57, the other end of the resistor R52 is connected to the first in-phase end of the amplifying chip, the first inverting end of the resistor R42 is connected to one end of the resistor R43, the other end of the resistor R42 is grounded, the other end of the resistor R43 is connected to the first output plate of the signal conditioning plate, and the second end of the signal conditioning plate is connected to the second output plate is grounded.
The microcontroller MCU2 controls the DAC chip (DAC 60501) to output analog voltage through the SPI interface, and the output voltage V of the DAC60501 DAC1 The operational amplifier A7 forms an adder circuit with 2 times of amplification factor, the added voltage is obtained by dividing-5V voltage by resistors R63 and R64, and the divided voltage is-1.25V, the output voltage V of the operational amplifier A7 DAC2 The method comprises the following steps:
V DAC2 ＝2(V DAC1 -1.25) (6)
the high output current amplifying chip LM7332 is internally connected with a voltage follower by two operational amplifiers, one path is connected with an inverting amplifier with the gain of-1, and the two paths of differential output voltages are as follows:
wherein the highest output current of each channel of LM7332 can reach 70mA, V P+ And V P- The output voltage of (a) is in the range of-2.5V to +2.5V. V (V) P+ And V P- The value of (2) and V in step 6 AIN The relation of (2) is:
V AIN the voltage range of (2) is 0-3300mV when V AIN V when=1650 mV P+ =0, V is determined according to equation (8) P+ And V P- Further determine V according to equations (6) and (7) DAC1 The DAC60501 can be set by the microcontroller MCU 2.
In this embodiment: referring to FIG. 8, the nixie tube display circuit adopts a 5-bit nixie tube, the highest bit is the sign bit, and the last 4 bits are V P+ The voltage value of (2) is expressed as mV, and a nixie tube is adopted for displaying, so that real-time observation is facilitated when the potentiometer and the dial switch are regulated.
In this embodiment: referring to fig. 9, the receiving board further includes a power circuit, and the power circuit provides a voltage source of ±24v by an AC-DC (alternating current to direct current) isolation power module; the voltage conversion of 24V to 15V, 15V to 10V, 10V to 5V, -24V to-15V and-15V to-5V is realized through LDO linear voltage regulator chips 78M15, 78M10, 78M05, 79M15 and 79M05, and power is supplied to each component. The microcontroller MCU2 is powered by a DC-DC (direct current to direct current) buck chip TPS5430, which reduces the 24V voltage to 3.3V.
The working principle of the invention is as follows: the transmitting plate is used for driving the transmitting coil to generate electromagnetic wave signals; the transmitting coil is used for transmitting sine electromagnetic wave signals with the amplitude of 15V and the frequency of 150KHZ, the receiving coil is used for receiving the sine electromagnetic wave signals transmitted by the wire core through the magnetic conduction effect of the wire core in the vulcanizing tube, and the upper receiving coil and the lower receiving coil output 150KHZ voltage signals with different sizes according to the distance between the upper receiving coil and the wire core and supply the voltage signals to the receiving plate; the receiving plate is used for detecting the voltage signal intensity with the frequency of 150KHZ in the upper receiving coil and the lower receiving coil, carrying out differential amplification, obtaining differential amplification voltage signals, and outputting the differential amplification voltage signals to the signal conditioning plate; the signal conditioning plate is used for amplifying the voltage signal according to the difference and controlling the working state of the lower traction driver; the lower traction driver is used for driving the lower traction machine to work according to the control signal when working; the lower tractor is used for dragging the wire core to enable the wire core to be in a catenary state in the vulcanizing pipe.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A digital overhang controller system for a cable production plant, the digital overhang controller system comprising:
the transmitting plate is used for driving the transmitting coil to generate electromagnetic wave signals;
a transmitting coil for transmitting a sinusoidal electromagnetic wave signal with amplitude of 15V and frequency of 150KHZ,
the upper receiving coil and the lower receiving coil are used for receiving sine electromagnetic wave signals transmitted by the wire core through the magnetic conduction effect of the wire core in the vulcanizing tube, and outputting 150KHZ voltage signals with different sizes according to the distance between the upper receiving coil and the wire core and the lower receiving coil and supplying the voltage signals to the receiving plate;
the receiving plate is used for detecting the voltage signal intensity with the frequency of 150KHZ in the upper receiving coil and the lower receiving coil, carrying out differential amplification, obtaining differential amplification voltage signals and outputting the differential amplification voltage signals to the signal conditioning plate;
the signal conditioning plate is used for amplifying the voltage signal according to the difference and controlling the working state of the lower traction driver;
the lower traction driver is used for driving the lower traction machine to work according to the control signal during work;
the lower traction machine is used for traction of the wire core, so that the wire core is in a catenary state in the vulcanizing pipe;
the transmitting plate is connected with the transmitting coil, the transmitting coil is fixed at the front end of the vulcanizing tube and insulated with the vulcanizing tube, the two receiving coils are fixed at the rear end of the vulcanizing tube, and the two receiving coils are vertically and symmetrically fixed on the vulcanizing tube in the horizontal direction, have equal inductance values and are also insulated with the vulcanizing tube; the receiving coil is connected with the receiving plate, the receiving plate is connected with the signal conditioning plate, the signal conditioning plate is connected with the lower traction driver, and the lower traction driver is connected with the lower tractor.
2. The digital suspension controller system for cable production equipment according to claim 1, wherein the transmitting board comprises a microcontroller MCU1, a DDS chip, an operational amplifier A and a power amplifier, an SPI port of the microcontroller MCU1 is connected with an input end of the DDS chip, an output end of the DDS chip is connected with an input end of the operational amplifier A, an output end of the operational amplifier A is connected with an input end of the power amplifier, an output end of the power amplifier is connected with one end of a transmitting coil and an anode of a diode D101, the other end of the transmitting coil is grounded, a cathode of the diode D101 is connected with one end of a resistor R101, the other end of the resistor R101 is connected with one end of a resistor R102, one end of a capacitor C101 and an AIN port of the microcontroller MCU1, the other end of the resistor R102 is grounded, and a GPIO port of the microcontroller MCU1 is connected with an LED indicator lamp.
3. The digital pendant controller system for a cable production plant of claim 1, wherein the receiving board comprises:
the demodulation circuit is used for receiving the voltage signals with the frequency of 150KHZ and different sizes output by the upper receiving coil and the lower receiving coil, and obtaining a modulation signal after demodulation;
the square wave generating and sampling and holding circuit is used for completing voltage signal demodulation through a 100HZ switching signal SIG-DIV auxiliary demodulation circuit, obtaining voltage amplitude signals Volt-L and Volt-R in the upper and lower receiving coils after sampling the demodulation signals, and sending the voltage amplitude signals Volt-L and Volt-R into the operation circuit;
the operation circuit is used for carrying out difference amplification on the voltage amplitude signals Volt-L and Volt-R, obtaining difference amplified voltage signals and outputting the difference amplified voltage signals to the micro controller MCU2;
the MCU2 is used for reading the differential amplification voltage signal and outputting the differential amplification voltage signal to the nixie tube display circuit and the signal output circuit;
the nixie tube display circuit is used for displaying the size of the differential amplification voltage signal;
the signal output circuit is used for outputting the differential amplification voltage signal to the signal conditioning board;
the first input end of the demodulation circuit is connected with the upper receiving coil and the lower receiving coil, the second input end of the demodulation circuit is connected with the first output end of the square wave generating and sampling and holding circuit, the output end of the demodulation circuit is connected with the input end of the square wave generating and sampling and holding circuit, the second output end of the square wave generating and sampling and holding circuit is connected with the input end of the operation circuit, the output end of the operation circuit is connected with the AIN port of the micro controller MCU2, the GPIO port of the micro controller MCU2 is connected with the input end of the nixie tube display circuit, the SPI port of the micro controller MCU2 is connected with the input end of the signal output circuit, and the output end of the signal output circuit is connected with the signal conditioning plate.
4. A digital suspension controller system for a cable production plant according to claim 3,
as still further aspects of the invention: the demodulation circuit comprises a coupling inductor CT1, a coupling inductor CT2, a coupling inductor CT3, an analog multiplier and an intermediate frequency AM demodulator, wherein the model of the analog multiplier is MC1496, and the model of the intermediate frequency AM demodulator is TDA1046;
one end of the input side of the coupling inductor CT2 is connected with one end of the upper receiving coil, the other end of the upper receiving coil is grounded, the other end of the input side of the coupling inductor CT2 is grounded, one end of the output side of the coupling inductor CT2 is connected with 5V voltage, the other end of the output side of the coupling inductor CT2 is connected with one end of a capacitor C19 and the SIN+ end of the analog multiplier, and the other end of the capacitor C19 is connected with 5V voltage;
one end of the input side of the coupling inductor CT3 is connected with one end of the lower receiving coil, the other end of the lower receiving coil is grounded, the other end of the input side of the coupling inductor CT3 is grounded, one end of the output side of the coupling inductor CT3 is connected with 5V voltage, the other end of the output side of the coupling inductor CT3 is connected with one end of a capacitor C25 and the SIN-end of an analog multiplier, and the other end of the capacitor C25 is connected with 5V voltage;
the CIN-end of the analog multiplier is connected with 10V voltage, the CIN+ end of the analog multiplier is connected with one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R3 is grounded, the other end of the resistor R2 is connected with the first output end of the square wave generating and sampling and holding circuit, the VEE end of the analog multiplier is grounded, the OUT+ end of the analog multiplier is connected with one end of a capacitor C14 and one end of the input side of a coupling inductor CT1, the OUT-end of the analog multiplier is connected with the other end of the capacitor C14, 15V voltage and the other end of the input side of the coupling inductor CT1, one end of the output side of the coupling inductor CT1 is grounded, the other end of the output side of the coupling inductor CT1 is connected with the FI-end of the intermediate frequency AM demodulator through a capacitor C11, the UQNF end of the intermediate frequency AM demodulator is connected with one end of a capacitor C15 and the same-phase end of an operational amplifier A1, the other end of the capacitor C15 is grounded, the opposite-phase end of the operational amplifier A1 is connected with the input end of a square wave generating and sampling and holding circuit, the output end of the operational amplifier A1 and one end of a resistor R8, the other end of the resistor R8 is connected with the same-phase end of an operational amplifier A2, the opposite-phase end of the operational amplifier A2 is connected with the positive electrode of a voltage stabilizing diode DZ1, the negative electrode of the voltage stabilizing diode DZ1 is connected with the output end of the operational amplifier A2 and one end of a resistor R14, and the other end of the resistor R14 is connected with one end of a capacitor C22 and the ZFRV1 end of the intermediate frequency AM demodulator.
5. The digital overhang controller system for a cable production plant according to claim 3, wherein the square wave generating and sample-and-hold circuit comprises a counter, an analog switch, a schmitt trigger, the counter being of the type CD4017, the analog switch being of the type CD4016, the schmitt trigger being of the type CD40106, the schmitt trigger, the resistor R19, the capacitor C29 forming an RC oscillating circuit, an output of the RC oscillating circuit being connected to an input of another schmitt trigger, an output of the other schmitt trigger being connected to a CLK of the counter, a CO of the counter being connected to a second input of the demodulation circuit, A3 of the counter being connected to an anode of the diode D1, A4 of the counter being connected to an anode of the diode D2, a cathode of the diode D1 being connected to an S0 of the negative analog switch of the diode D2, the positive pole of diode D3 is connected to 8 ends of counter, the positive pole of diode D4 is connected to 9 ends of counter, the negative pole of diode D3 is connected to the negative pole of diode D4, analog switch 'S S1 end, analog switch' S IO0, the output of demodulation circuit is connected to IO1 end, analog switch 'S OI0 end is connected with one end of resistance R21, the homophase end of operational amplifier A3 is connected to the other end of resistance R21, the output of operational amplifier A3 is connected to the inverting terminal of operational amplifier A3, the input of operational circuit, the one end of resistance R31 is connected to analog switch' S OI1 end, the homophase end of operational amplifier A4 is connected to the other end of resistance R31, the output of operational amplifier A4 is connected to the inverting terminal of operational amplifier A4, the input of operational circuit.
6. A digital suspension controller system for a cable production device according to claim 3, wherein the operational circuit comprises an instrumentation amplifier, the model of which is AD8220, the in+ terminal of the instrumentation amplifier being connected to the output terminal of the operational amplifier A6, one terminal of the resistor R32, the other terminal of the resistor R32 being connected to one terminal of the resistor R33, the inverting terminal of the operational amplifier A6, the other terminal of the resistor R33 being connected to the sliding terminal of the potentiometer RP3, one terminal of the potentiometer RP3 being connected to a 5V voltage, the other terminal of the potentiometer RP3 being grounded, the IN-phase terminal of the operational amplifier A6 being connected to the second output terminal of the square wave generating and sample-and-hold circuit via the resistor R28; the IN-end of the instrumentation amplifier is connected with the output end of the operational amplifier A5 and one end of the resistor R18, the other end of the resistor R18 is connected with one end of the resistor R17 and the inverting end of the operational amplifier A5, the other end of the resistor R17 is connected with the sliding end of the potentiometer RP1, one end of the potentiometer RP1 is connected with 5V voltage, the other end of the potentiometer RP1 is grounded, and the IN-phase end of the operational amplifier A5 is connected with the second output end of the square wave generating and sampling and holding circuit through the resistor R20; the REF end of the instrument amplifier is connected with the sliding end of the potentiometer RP2, one end of the potentiometer RP2 is connected with 5V voltage, the other end of the potentiometer RP2 is grounded, and the VOUT end of the instrument amplifier is connected with the AIN port of the microcontroller MCU 2.
7. The digital suspension controller system for cable production equipment according to claim 3, wherein the signal output circuit comprises a DAC chip and an amplifying chip, the DAC chip is of DAC60501 type, the amplifying chip is of LM7332 type, the DIN, SYNC, SCLK end of the DAC chip is connected to the SPI port of the microcontroller MCU2, the output end of the DAC chip is connected to one end of the resistor R51, the other end of the resistor R51 is connected to one end of the resistor R56, the in-phase end of the operational amplifier A7, the other end of the resistor R56 is connected to one end of the resistor R63, one end of the resistor R64, the other end of the resistor R63 is connected to-5V voltage, the other end of the resistor R64 is grounded, the inverting end of the operational amplifier A7 is connected to one end of the resistor R48, one end of the resistor R41, the other end of the resistor R48 is grounded, the other end of the resistor R41 is connected to the output end of the operational amplifier A7, one end of the resistor R52, one end of the resistor R57, the other end of the resistor R52 is connected to the first in-phase end of the amplifying chip, the first inverting end of the amplifying chip is connected to one end of the resistor R56, the other end of the resistor R43, the other end of the resistor R42 is connected to the other end of the resistor R42 is connected to the first in-phase end of the amplifying chip, the first end of the signal conditioning board is connected to the first end of the signal conditioning board, and the other end of the output end of the resistor R62 is connected to the first end of the signal conditioning chip.
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| 张克兆: "《基于自抗扰控制的交联电缆悬垂控制系统》", 《电子测量技术》, no. 19, 31 December 2022 (2022-12-31), pages 56 * |
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