562 results about "Analogue switch" patented technology

The invention relates to the technical field of ink-jet printing, and discloses a nozzle driving method, system and device and a storage medium, and the method comprises the steps: generating a digital waveform signal based on a printing demand, and converting the digital waveform signal into an analog voltage waveform through a digital-to-analog conversion module; performing waveform configuration on the analog voltage waveform through an analog switch matrix to generate a target analog waveform; controlling a high-voltage amplification circuit to boost and amplify the target analog waveform to output an initial driving level; driving a nozzle to jet ink droplets based on the initial driving level, and collecting ink droplet state parameters by using an ink droplet monitoring module; comparing the ink droplet state parameters with a preset target value to obtain a comparison result, and generating an adjustment parameter set according to the comparison result; optimizing the initial driving level generation process based on the adjustment parameter set to obtain an optimized driving level; according to the invention, through a closed-loop control process, the problem of poor driving signal adaptability caused by existing open-loop control is effectively solved.

The invention relates to the technical field of communication, in particular to a USB-A interface and serial port dynamic switching and protection system based on an analog switch. Comprising a main control unit, the main control unit is used for planning dynamic switching and conflict coordination of a USB-A interface and a serial port as a whole, generating a conflict-free channel switching control instruction by integrating a dynamic priority scheduling algorithm and combining a USB data transmission real-time load, a serial port communication request emergency degree and a device historical interaction record fed back by a state detection unit, and sending the conflict-free channel switching control instruction to the state detection unit; the analog switch unit is driven to complete channel gating; an analog switch unit; a grading protection unit; a protocol adaptation unit; and a state detection unit. Priority scheduling is carried out by means of the main control unit in combination with multi-dimensional parameters such as the transmission load of the USB-A interface and the communication emergency degree of the serial port UART, communication channels of the USB-A interface and the serial port can be flexibly switched, the flexibility and adaptability of interface switching are enhanced, and the problem of switching limitation caused by a single triggering condition is solved.

The invention belongs to the technical field of analog switches, and particularly relates to a double-channel single-pole double-throw analog switch circuit which comprises two turn-off leakage compensation modules, two ISO isolation circuits, two turn-on leakage compensation modules, eight MOS tubes M5-M12 and a current source. All the devices are correspondingly connected according to a circuit diagram to form an analog switch circuit; the invention designs a dual-channel single-pole double-throw analog switch, a 0.25 [mu] m BCD process is adopted, two groups of completely consistent single-pole double-branch CMOS switches are arranged in a chip, the normal temperature interval is-40 DEG C to 125 DEG C, the analog switch can normally work under three power supply conditions of + / -15V, 12V, 0V and + / -5V, and the analog switch has the advantages of low on-resistance, high switching speed, high reliability and the like. And conduction electric leakage and turn-off electric leakage are small.

The invention belongs to the technical field of current source control, and particularly relates to a self-adaptive intelligent current source output control system, and the system works cooperatively through a plurality of modules: a load detection module monitors the load access state in real time, converts a current signal into a voltage signal Udetect, and outputs the voltage signal Udetect; the state stabilization filtering module receives the signal, filters high-frequency noise through an RC low-pass filtering unit, amplifies the signal through an in-phase proportion amplification unit, and is internally provided with a signal monitoring and judging unit to extract a load characteristic signal INPUTIDE in a stable working state; the feedback calculation module generates a feedback control parameter through preset threshold comparison and logical operation according to the INPUTIDE; the analog switch control module selects a resistance potential-divider network input channel according to the feedback control parameters, and outputs a current source regulation and control signal VC; and the adjustable current source module outputs a working current adaptive to the load according to the VC. The self-adaptive intelligent current source output control system is superior to a traditional system in dynamic adaptation, protection mechanism, multi-scene adaptation, precision and stability.

The invention provides a protocol interface circuit switching method for data acquisition and transmission of an unmanned ship, which belongs to the technical field of protocol interface circuit switching, and is characterized in that a multiplexing analog switch circuit and a standardized level conversion chip circuit are integrated in a circuit for data acquisition and transmission of the unmanned ship to realize seamless switching of communication ports among RS232, RS485 and TTL (Transistor-Transistor Logic); on the premise that navigation and operation of the unmanned ship do not need to be interrupted, a proper communication standard and a proper data transmission path are dynamically selected according to actual requirements. A multiplexing analog switch and a standardized level conversion chip are integrated in the circuit, so that seamless rapid switching among the RS232, the RS485 and the TTL can be realized. On the premise that navigation and operation of the unmanned ship do not need to be interrupted, a proper communication standard and a proper data transmission path can be dynamically selected according to actual requirements.

The invention relates to the technical field of direct current motor driving, and provides a high-speed direct current motor driving system which comprises a control module, a driving module and a feedback module and is based on an analog switch and an FPGA. By implementing the scheme, in the first aspect, the two sides of the direct current motor of the middle bridge arm of the full-bridge power circuit are each connected with a sampling resistor in series, and high-precision bidirectional current measurement of the direct current motor is achieved and the reliability of a driving system is improved through full-path detection and common-mode rejection under the condition that the power extension time and power consumption are not increased; and on the second aspect, the common-mode input voltage of the operational amplifier is relatively small through the use of the analog switch and the amplitude limiting diode, and the operational amplifier is not required to be limited by high common-mode voltage, so that the type of the operational amplifier with higher response speed can be selected. And thirdly, a fault detection unit and a redundancy check unit are arranged in the FPGA, and the safety and the reliability of the system are improved through cooperative work of the FPGA, a double-sampling resistor, an amplitude limiting diode and an analog switch.

A chess-like piece positioning and recognition system, including: an MCU, an RFID module, multi-channel analog switches, an electromagnet and communication signal switch unit, an electromagnetic drive unit, antennas, silicon steel blocks, and pieces. The MCU is used for communication with the RFID module, selecting channels of the multi-channel analog switches, and electromagnet and communication signal switch selection. The RFID module is used for reading information from the pieces. The multi-channel analog switches are used for group gating and intra-group channel gating of the RF channels. The electromagnet and communication signal switch unit is used for switching between the electromagnetic drive unit and the RF channels. The electromagnetic drive unit is used for driving an electromagnet. The antenna is used for sending and receiving signals from the pieces and also serves as the coil for the electromagnet. The silicon steel block is used as the core of the electromagnet, which generates a magnetic attraction to the pieces after being magnetized.

The invention discloses an ultrasonic transducer signal transmitting and receiving switching circuit, which comprises a signal transmitting module, an ultrasonic sensor A, an ultrasonic sensor B and a signal receiving module, and is characterized in that the ultrasonic sensor A is electrically connected with the signal transmitting module through a first analog switch group and a third analog switch group; the ultrasonic sensor B is electrically connected with the signal transmitting module through a second analog switch group and a fourth analog switch group; the ultrasonic sensor A is electrically connected with the signal receiving module through the first analog switch group and the fifth analog switch group, and the ultrasonic sensor B is electrically connected with the signal receiving module through the second analog switch group and the sixth analog switch group. The receiving and transmitting switching circuit suppresses the problem of receiving channel coupling in a manner of consuming an interference signal coupled by an analog switch through grounding.

The invention relates to an electric control system test board for engineering equipment, which comprises a test box, a comprehensive controller, an operation control box, a closed pump control box and a computer, the test box is connected with a tested electric control system through a test cable, and the electric control system is tested by pulling a toggle switch on a panel of the test box or rotating a single-circle carbon film potentiometer. An analog switching value or an analog quantity electric signal is transmitted to a tested electric control system and processed by an electric control system controller to control a corresponding system state indicating lamp on the test box to be lighted so as to test the correctness, stability and safety of the function of the electric control system, and the system can be operated by a single person, is simple and convenient to operate, is high in test response speed, and is visual and clear in test result. Powerful support is provided for early-stage performance analysis, system design, test verification and production delivery of the electric control system of the engineering equipment, so that the production quality of the engineering equipment is continuously improved, the time, manpower and material cost is reduced, and the development and production cycle is shortened.

The invention relates to a flash program protection circuit and a flash program protection method, in particular to a flash program protection circuit and a flash program protection method in a power failure process of equipment, and solves the technical problem that an operation instruction of a flash chip is sent by mistake due to unstable core voltage of a main control chip in the power failure process of the equipment, so that the flash program is rewritten or erased. The single-pole double-throw analog switch is additionally arranged between the chip selection end of the main control chip and the chip selection end of the flash chip and / or between the data end of the main control chip and the data end of the flash chip, so that the main control chip is communicated with the chip selection end of the flash chip and / or the main control chip is communicated with the data end of the flash chip when the system is powered on, and is disconnected when the system is powered off; the chip selection signal and / or the data signal are / is disconnected, so that an operation instruction generated by the main control chip cannot be sent to the flash chip, and a flash program stored in the flash chip is prevented from being erased or rewritten.

The invention discloses a system reference clock frequency accuracy automatic calibration circuit and a calibration method thereof, and belongs to the technical field of frequency sources, the calibration circuit comprises a first crystal oscillator, a first power divider, a second power divider, a second crystal oscillator, an analog switch, a radio frequency switch, a detector, a comparator, an FPGA controller, a digital analog converter, an operational amplifier and a temperature sensor. When an external high-precision reference clock is accessed, the FPGA controller automatically switches a frequency measurement reference, performs high-precision frequency measurement on a 100MHz signal output by the first crystal oscillator, and judges whether calibration is needed or not according to frequency offset; if calibration is needed, the output voltage of the digital-to-analog converter is adjusted, the Vc end of the first crystal oscillator is controlled after operational amplification, and frequency closed-loop adjustment is achieved. According to the method, the crystal oscillator does not need to be disassembled, calibration is rapidly completed on site, and system availability and long-term frequency stability are remarkably improved.

The invention belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

The invention provides a nerve regulation and control system and method for a spinal cord ventral epidural region, and the system employs a microprocessor to generate multiple paths of pulse width modulation signals, and drives a voltage-controlled current source after amplitude adjustment. Stimulation current with adjustable frequency, pulse width and amplitude is output to act on a spinal cord ventral nerve structure. Real-time monitoring of stimulation current of each channel is realized through combination of voltage sampling and a single-pole multi-throw analog switch, feedback information of a body position, myoelectricity, pressure and other multi-mode sensors is fused, a closed-loop control mechanism is constructed, and dynamic adjustment and individualized optimization of electrical stimulation parameters are realized. The system has the advantages of being more accurate in electrical stimulation positioning, more sensitive in response, more intelligent in control and the like, and is suitable for intelligent rehabilitation intervention in scenes of spinal cord injury, cerebral palsy, neurological dysfunction and the like.

The invention relates to the field of electrochemical signal processing, and particularly discloses a wearable detection circuit for an electrochemical oxygen sensor, comprising: a transimpedance amplification module comprising an analog switch S1 and at least two feedback resistors with different resistance values, the feedback resistors being connected in parallel, the analog switch S1 being connected in series with the feedback resistors, the control circuit is used for controlling a feedback resistor connected to the circuit and outputting a first voltage signal; the active low-pass filtering module is used for filtering the first voltage signal and filtering thermal noise, power frequency interference and motion artifact noise to obtain a second voltage signal; the temperature calibration module is used for collecting temperature information; the microcontroller is used for providing driving voltage for the transimpedance amplification module and the active low-pass filtering module and receiving the temperature information and the second voltage signal; the microcontroller is used for receiving the second voltage signal and comparing the second voltage signal with a preset value. The technical scheme of the invention is high in precision and low in power consumption, and can reduce environmental interference.

The invention discloses a small signal output and automatic calibration system and method special for power secondary equipment. The system comprises a voltage acquisition loop, a current acquisition loop, an analog switch switching loop, an ADC sampling loop, an acquisition channel calibration module and a calibration parameter calculation module. According to the invention, the internal resistor of the DAC is combined with the operational amplifier to acquire the output current of the current acquisition loop, so that the use of external elements is avoided; meanwhile, voltage and current signals are combined and sent to the ADC sampling loop through the analog switch switching loop, calibration parameters are automatically calculated in combination with a calibration algorithm, the output precision is ensured, the influence of switch network on-resistance errors and external element drift is eliminated, and synchronous monitoring and automatic calibration are achieved.

The utility model provides an electrical parameter measuring circuit, an electrical parameter measuring unit comprises a plurality of signal driving ends and a plurality of voltage output ends, each signal driving end corresponds to one voltage output end, and the measuring signal output end of each analog switch is correspondingly connected with one signal driving end; each sampling output end of the multiplexer is connected with the input end of the signal conditioning unit, and the voltage input end corresponding to the sampling output end is connected with one voltage output end in the electrical parameter measuring unit; the input end of the analog-to-digital conversion unit is connected with the output end of the signal conditioning unit, and the output end of the analog-to-digital conversion unit is connected with the input end of the main controller. In the scheme, a discrete scheme is replaced by the chip for measuring the electrical parameters, a single chip realizes the functions of voltage and current conversion and amplification, digital-to-analog conversion, clamping, calibration and the like, and an external analog switch circuit is matched to realize single-board multi-channel test, so that the reliability of chip test is improved, and the test efficiency is improved. And the board occupation area is reduced.

The utility model belongs to the technical field of welding power supply interface circuits, and particularly discloses a pulse interface circuit between a PLC (Programmable Logic Controller) and a TIG (Tungsten Inert Gas) welding power supply, which is characterized in that a pin 1 of an analog switch chip accesses a peak welding current input signal through a terminal 3 of a wiring terminal; a pin 5 of the analog switch chip is connected to a base value welding current input signal through a terminal 4 of the wiring terminal, a pin 10 of the analog switch chip is connected to a pulse width modulation signal through a terminal 1 of the wiring terminal, a pin 3 of the analog switch chip is electrically connected with one end of a voltage-regulator tube D4, and the other end of the voltage-regulator tube D4 is connected to a negative electrode of the power supply. According to the utility model, a pulse interface circuit is formed through the connection relation among the analog switch chip, the voltage-regulator tube, the resistor, the capacitor and the wiring terminal, so that a pulse width modulation signal PWM and an analog quantity signal of the PLC controller are converted into a pulse signal of a TIG welding power supply.

Provided in the present disclosure is a connector port multiplexing apparatus, comprising: a latch reset circuit, which is electrically connected to a first voltage source and a power terminal of a universal serial bus connector, and is configured to output a control signal on the basis of a first voltage that is output by the first voltage source and a second voltage from the universal serial bus connector; and an analog switch circuit, a control terminal of which is electrically connected to an output terminal of the latch reset circuit, a first terminal of which is electrically connected to a first signal transmission terminal of a universal serial bus controller, a second terminal of which is electrically connected to a second signal transmission terminal of the universal serial bus controller, and a third terminal of which is electrically connected to a multiplexing signal transmission terminal of the universal serial bus connector, wherein the analog switch circuit is configured to establish, on the basis of the control signal, a connection path between the first terminal and the third terminal of the analog switch circuit or a connection path between the second terminal and the third terminal of the analog switch circuit.

The invention relates to the technical field of electronic measurement, and provides a small electric field sensor which comprises a signal receiving module, a cascade gain module, a main control module, a gain control module and a filtering module. The signal receiving module is composed of a differential transmission interface and a double-diode. The cascade gain module comprises an instrument operational amplifier and two in-phase operational amplifiers SGM8061U8 which are connected in series; the main control module comprises an interface unit, a frequency measurement unit and a control unit; the gain control module is composed of an SGM4511 four-way analog switch; and the filtering module is composed of two groups of three-stage filters. The method is suitable for signal detection in various scenes such as aerospace, submarine and industrial equipment monitoring. The signal acquisition stability and response speed of the system in a complex electromagnetic environment can be improved.

The utility model provides a multi-path PD detection device which comprises a plurality of PD detection circuits and an MCU control chip, and each PD detection circuit is composed of a PD acquisition circuit, an analog switch circuit and an operational amplifier follower circuit. And the PD acquisition circuit sequentially comprises a capacitance limiting module, a PD input module, a resistance-capacitance module and a voltage following module, and is used for filtering, isolating and stabilizing the output signal of the photodiode. A plurality of PD signals are multiplexed by an analog switch and then are sequentially sent to an operational amplifier follower circuit, and finally efficient acquisition is realized through a small number of ADC (Analog to Digital Converter) interfaces. The device is modularized in structure, high in expandability, simple in structure, low in cost and excellent in real-time performance, has a large number of PD acquisition channels and a small number of ADC interfaces, and is suitable for realizing centralized acquisition of large-scale PD channels.

The application discloses an analog switch for improving channel isolation, and relates to the field of switch circuits.The application comprises N ports and N T-type switches, wherein one end of a first T-type switch is connected with a first port analog signal input end; the other end of the first T-type switch is connected with an analog-to-digital converter; one end of an Nth T-type switch is connected with an Nth port analog signal input end; and the other end of the Nth T-type switch is connected with the analog-to-digital converter.The application adopts complementary T-type NMOS and T-type PMOS parallel transmission, so that full-amplitude transmission of signals can be obtained, level loss is avoided, and on-resistance is reduced.

The invention discloses a wide-range switch tube leakage current detection method and system, and relates to the technical field of semiconductor device detection, and the method comprises the steps: connecting a to-be-detected NMOS switch tube with a trans-impedance amplifier, and collecting the drain current; the trans-impedance amplifier converts drain current into an output voltage signal V. The switchable feedback resistor at least comprises two feedback branches corresponding to different ranges. When it is detected that the output voltage approaches a negative output saturation threshold, a corresponding gain range is switched; before each measurement period, an analog-to-digital converter is grounded through an analog switch, system offset voltage is sampled, and a digital compensation value of switch tube leakage current is calculated and compensated; rC low-pass filtering and software notch filtering are carried out on the compensated voltage signal, and then sampling is carried out; and comparing the sampling result with a preset threshold value, and outputting a leakage current detection result. According to the invention, the accuracy of the measurement result of the drain current of the NMOS transistor is improved, and the reliability of device performance evaluation is guaranteed.

The utility model relates to electromagnetic flowmeter technical field, the utility model discloses a kind of electromagnetic flowmeter transmitter with temperature measurement, including through power supply circuit and signal isolation circuit connection control circuit and signal processing circuit, the signal processing circuit includes the wiring terminal J8 of realizing multiple wiring mode;Based on the selective connection temperature sensor of wiring terminal J8, temperature signal is connected to the input end of operational amplifier UT1A by analog switch U18 output, based on the input end of analog-digital converter U19 connected to the output end of operational amplifier UT1A;The control pin of analog-digital converter U19 is connected to control circuit, for controlling the collection and transmission of data, the utility model is through integrated multifunction and flexible measurement mode, high precision, high flexibility, low cost, high reliability and strong anti-interference ability are realized, the efficiency and performance of industrial measurement system are significantly improved.

The invention discloses a multi-channel ultra-wide-frequency-domain signal acquisition method and device. The method comprises the steps that signal sources of multiple channels are sent to the IN + end of an amplifier; the FPGA transmits the bias analog signal to the IN-end of the amplifier; a signal source and a bias analog signal are converted into differential signals, the differential signals are sent to an analog switch, and an FPGA configures a channel switching strategy and a measurement scheme of an ADC chip; the ADC performs analog-to-digital conversion on the differential signal and sends an obtained digital signal to the FPGA; the clock signal source provides a system clock and an equipment clock for the FPGA and the ADC; a multipurpose digital timing and triggering signal is connected with the analog front-end board card, and a generated synchronous sampling signal is sent to the FPGA; the FPGA synchronously acquires the voltage, current and power of alternating current and direct current in real time through the three-phase voltage and current acquisition unit; and sending the digital signal, the time node of the current sampling data and the temperature drift data to a data receiving end to complete multichannel ultra-wide frequency domain signal acquisition. The problem of measurement deviation caused by inconsistent gain of two channels of the module is solved, and the measurement precision is improved.

The invention provides a partial discharge mode identification method, system and device and a medium, and belongs to the technical field of high voltage and insulation. The method comprises the following steps: simulating a partial discharge phenomenon of the switch cabinet under a laboratory condition, and obtaining a partial discharge pulse waveform by adopting a pulse current method; performing time-domain pulse waveform denoising on the partial discharge pulse waveform by adopting a particle swarm optimization algorithm to generate a partial discharge time-domain pulse waveform, and performing denoising effect inspection; carrying out fast Fourier transform on the time domain pulse waveform of partial discharge to obtain a frequency domain spectrogram, and carrying out time-frequency domain fifteen-dimensional characteristic parameter extraction on kurtosis, asymmetry and contents of different frequency bands according to the time domain waveform and the frequency domain spectrogram of the partial discharge phenomenon; based on a traditional genetic algorithm, a mutation operator and a crossover operator are adjusted, and a target adaptive genetic algorithm is generated; an artificial neural network classifier of a target adaptive genetic algorithm is adopted, and 15-dimensional characteristic parameters are used for training and testing of partial discharge mode recognition.

The invention discloses a compensation device of an amplifier and a signal amplification system, and belongs to the technical field of power electronics. The device is characterized in that the input ends of a first amplifier and a second amplifier are respectively connected with a plug through a first analog switch and a second analog switch; the output ends of the first amplifier and the second amplifier are connected with the controller through the analog-to-digital converter; the plug can output a reference signal, a ground signal and a sensor signal; the execution logic of the controller is as follows: acquiring a signal when the first amplifier samples a sensor signal through the analog-to-digital converter to obtain a target signal; respectively acquiring difference signals when the reference signal and the ground signal are sampled by the first amplifier and the second amplifier through an analog-to-digital converter to obtain a first signal and a second signal; and correcting the target signal by using the ratio of the first signal to the second signal. By means of the device, the manufacturing cost needed when the amplified signal is corrected and corrected can be greatly reduced.

The invention relates to the technical field of measurement of long-distance and high-accuracy temperature measurement resistors, and particularly discloses a resistor temperature measurement method, which comprises a constant current source I, temperature measurement resistors RX and RY, a reference resistor RR, an analog switch, an instrument amplifier, an analog-to-digital converter and a microcontroller, the method comprises the following specific steps that S1, an analog switch controls a constant current source I to sequentially flow through temperature measurement resistors RX and RY and a reference resistor RR, and current generates a voltage on each resistor and is in direct proportion to the resistance value of the voltage; and S2, measuring the voltages of the temperature measuring resistors RX and RY and the reference resistor RR through an instrument amplifier and an analog-to-digital converter to obtain VX1, the voltage of the temperature measuring resistor RX under the forward current condition, VY1, the voltage of the temperature measuring resistor RY under the forward current condition, and VR1, the voltage of the temperature measuring resistor RR under the forward current condition. According to the resistance temperature measurement method, 0.00025 DEG C or better uncertainty can be obtained, and observable errors caused by thermoelectromotive force can be effectively eliminated.

The utility model relates to a circuit for avoiding train running data sharing storage duplex, and belongs to the technical field of train running data safety. According to the utility model, the analog switch is arranged to realize the switching between the memory and the equipment master control module and the external access module, and at most only one of the equipment master control module and the external access module can access the memory at the same time, so that the console is not networked through the equipment master control module; the problem of data leakage of the console connected with the external access module when the external access module and the equipment master control access the memory at the same time is avoided, and the data security is improved.

The application discloses a kind of low conduction resistance flatness analog switch structure of circuit design technical field, including CMOS transmission gate circuit and gate voltage adjusting circuit, CMOS transmission gate circuit includes transmission gate and auxiliary circuit, transmission gate and auxiliary circuit are electrically connected, CMOS transmission gate circuit is used for the signal transmission of main path;Gate voltage adjusting circuit is connected between the gate of PMOS pipe of CMOS transmission gate circuit and the gate of NMOS pipe.The whole input voltage range is handled by gate voltage adjusting circuit in the application, according to input voltage variation, output different slope gate control voltage, to reduce the conduction resistance variation of CMOS transmission gate, to reduce the purpose of conduction resistance flatness.

The utility model provides a self-adaptive analog quantity signal acquisition circuit, which comprises a signal input terminal, a voltage / current self-adaptive circuit and an MCU (Microprogrammed Control Unit) end ADC (Analog to Digital Converter) acquisition module, and is characterized in that the signal input terminal is used for inputting a voltage or current signal of a sensor; the voltage / current self-adaptive circuit is used for converting and judging voltage or current signals input by the signal input terminal, the input end of the voltage / current self-adaptive circuit is connected with the output end of the input end protection circuit, the voltage / current self-adaptive circuit comprises an analog switch U1 and a resistor R, the U1 comprises independent switches K1, K2, K3 and K4, the resistor comprises R1, R2, R3 and R4, the U1 is provided with four independent channels A, B, C and D, control circuits for controlling the independent switches K1, K2, K3 and K4 are respectively arranged in the control circuit; and the MCU end ADC acquisition module is used for acquiring a voltage value or a current value in the voltage / current self-adaptive circuit. Adaptation can be performed according to the type of the sensor, so that the hardware cost of the device is effectively reduced, and the working efficiency is improved.