31 results about "Isolating amplifier" patented technology

The invention discloses a control method for under-voltage tripping and voltage detection closing for a low-voltage switch, and relates to the technical field of power distribution automation. The problems of function separation, low detection precision, poor anti-interference capability and inconvenient maintenance in the prior art are solved. The method comprises the following steps: S1, acquiring a high-precision digital voltage through a voltage transformer, a voltage division network, an isolation amplifier and a 24-bit delta sigma ADC; s2, interference is suppressed by combining temperature compensation, FIR filtering, median filtering and an oversampling integration algorithm; s3, comparing the real-time voltage with a tripping / closing threshold value which can be configured online in parallel; s4 / S5, triggering a zero-crossing short pulse to drive opening / closing based on the threshold value and the time delay; s6, performing parallel fault monitoring, shielding misoperation and uploading fault data; according to the invention, the detection precision, the anti-interference capability and the operation and maintenance efficiency of the system are obviously improved.

The invention discloses a current injection type SiC MOSFET parallel current-sharing driving circuit, which detects the voltage difference between two ends of a current sampling resistor through an isolation amplifier and a differential amplification circuit, indirectly measures the current value of each parallel branch, and determines the current difference value of the parallel branches through the differential amplification circuit. And when the current of the SiC MOSFET parallel circuit is unbalanced, a control signal is output to the forward current injection circuit or the reverse current injection circuit. Through a forward current injection circuit and a reverse current injection circuit, forward current or reverse current is injected into a grid electrode under the action of a control signal, the change rate of grid-source voltage is changed, the switching-on and switching-off speed of SiC MOSFETs is dynamically adjusted, the phenomenon of non-uniform parallel current of the SiC MOSFETs caused by inconsistent device parameters or asymmetric circuit layout in the circuit is effectively inhibited, and the switching-on and switching-off speed of the SiC MOSFETs is improved. The active current sharing circuit has the advantages of being good in adjusting performance and high in response speed.

The utility model discloses an industrial control board based on STM32F103 singlechip, it includes main control chip, RS 485 level conversion circuit, digital I / O circuit and LED pilot lamp, and RS 485 circuit realizes efficient level conversion through three stage anti -interference framework magnetic pearl filtering, photo -coupler isolation, TVS protection, and digital I / O circuit adopts photo -coupler and isolation amplifier to enhance signal stability, and is equipped with LED pilot lamp feedback state, and the application effectively reduces the code rate less than 10 ‑7 , reduces signal dithering, and the temperature drift attenuation is only 2.1%, is suitable for industrial automation and intelligent manufacturing system, has simple structure, low in cost, stable performance and the advantages such as.

The present invention relates to the technical field of passive rubidium atomic clock design, and specifically, to a complete design method and device for a passive rubidium atomic clock. It includes a microcontroller, a satellite time synchronization module, a test system, a frequency drift correction module, an operation reliability monitoring module, and a big data modeling of component parameters. In the present invention, the VCXO frequency-divided signal is compared with the GPS second pulse signal to detect the frequency deviation. In addition, after the frequency output signal of the rubidium atomic frequency standard is passed through an isolation amplifier, one path is used for output, and the other path is sent to a frequency drift and stability tester to be compared with a high-stability clock signal to obtain the original frequency difference, and then the microcontroller is used to realize the control of frequency deviation correction.

The application discloses a real gas flow calibration control system, which is characterized by comprising a host module, a memory, an input / output module, a power module and a communication module; a parameter acquisition module comprising a real gas parameter collector, a pulse isolation amplifier and a pulse / time measurement module; the real gas parameter collector is used for collecting the temperature, pressure and instantaneous flow of real gas in a real gas circulation loop, and the output side is signal-connected with the input / output module; the input side of the pulse isolation amplifier is signal-connected with a standard meter and a meter to be detected, and the output side is signal-connected with the input side of the pulse / time measurement module; the output side of the pulse / time measurement module is signal-connected with the input / output module; and the electric control actuating mechanism comprises a relay, an electric control valve, a flow driving control module and a temperature control module, which are signal-connected with corresponding interfaces of the input / output module. The application further discloses a real gas flow high / low temperature calibration system.

The invention discloses an insulation detection circuit device and method. The insulation detection circuit device comprises a first solid-state relay U1 control circuit, a detection circuit and a high-voltage reed switch relay control circuit. The first solid-state relay control circuit comprises a first solid-state relay U1, and when the MCU module outputs a high level, the first solid-state relay U1 is switched on; the detection circuit comprises a first operational amplifier circuit, a second operational amplifier circuit and an isolation amplifier circuit, and the detection circuit is used for monitoring voltages at two ends of the resistor Rnss to be detected in real time; the high-voltage reed switch relay control circuit comprises a high-voltage reed switch relay, and the output end of the high-voltage reed switch relay can switch voltage; a traditional insulation detection circuit often needs two AD pins to detect the voltage of an upper bridge arm and a lower bridge arm which are switched back and forth, and the circuit does not need to be additionally connected with a known resistor in parallel, occupies few AD pins of an MCU module, and facilitates passing of a high-voltage insulation and withstand voltage test.

A protection control system includes: an input conversion substrate 40 that takes in an electric quantity from a power system via at least one of a shunt resistor 10 and a voltage dividing resistor 11, and converts the electric quantity from the power system to an electric signal by achieving electrical insulation by using insulation amplifiers 12 and 13; and a protection control arithmetic means that performs averaging processing 2012 and 2016 for calculating an average value on the outputs of the input conversion substrate 40, subtraction processing 2013 and 2017 for subtracting the average value from each of the outputs of the input conversion substrate 40, and an arithmetic operation for at least one of protection and control of the power system by using the outputs of the subtraction processing 2013 and 2017. This provides a protection control system, a merging unit, and a protection control device each having an excellent input converter.

The invention discloses a harmonic voltage combined generation device based on a pulse-driven quantum voltage source, which comprises two Josephson junction arrays, outputs of the two Josephson junction arrays are connected in series to form a standard source voltage signal, the output of one pulse code pattern generator serves as the input of one Josephson junction array to form a first synthesis channel, and the output of the other pulse code pattern generator serves as the input of the other Josephson junction array to form a second synthesis channel. The output of the other pulse code pattern generator serves as the input of the other Josephson junction array to form a second synthesis channel, the first synthesis channel outputs fundamental wave voltage, and the second synthesis channel outputs second harmonic and higher harmonic voltage; a driving compensation input port of the Josephson junction array in the first synthesis channel is connected with a compensation signal source through an isolation amplifier, and the compensation signal source is used for generating an alternating current voltage signal with the same frequency as the fundamental wave voltage; and the isolation amplifier is responsible for converting an AC voltage signal output by the compensation signal source into an AC current signal for driving pulse correction. According to the invention, complex fundamental wave and multi-harmonic wave synthesis can be realized.

The utility model discloses a kind of opto-coupler isolation amplification circuits, including first voltage stabilizing circuit, first amplifier circuit, second amplifier circuit, the input end of first voltage stabilizing circuit is used to obtain input signal, the output end of first voltage stabilizing circuit is connected the input end of first amplifier circuit, the output end of first amplifier circuit is connected the input end of second amplifier circuit, the output end of second amplifier circuit is used to output isolated amplification signal;First amplifier circuit is used to the input signal of first voltage stabilizing circuit output is amplified after opto-coupler isolation according to preset first amplification multiple, obtains first amplification signal;Second amplifier circuit is used to first amplification signal is amplified according to preset second amplification multiple, obtains isolated amplification signal.Solved the isolation chip of special use in traditional isolation circuit, this type of isolation chip has fixed gain multiple, signal isolation after output signal amplitude adjustment circuit is relatively complex, leading to the problem of higher cost of existing isolation circuit.

The present application discloses a collection circuit, method and related device for the peak voltage of a point screen AC signal, which is used to improve the collection accuracy of the AC peak voltage. The signal to be collected is obtained; the signal to be collected is followed and isolated; the signal to be collected after following and isolating is input into the peak voltage storage unit; the switch MOS tube in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module is controlled to be disconnected; the target signal is stored through the first RC circuit and the second RC circuit; the leakage current of the switch MOS tube is compensated by the compensation MOS tube; the peak voltage is collected through the positive / negative voltage isolation amplifier module and the ADC; the switch MOS tube in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module is controlled to be closed; when the voltage discharge is completed, the switch MOS tube in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module is controlled to be disconnected, and a new signal to be collected is obtained again.

The present invention discloses a millimeter wave isolation amplifier (10), comprising a first isolated circuit (20), a second isolated circuit (30) and a millimeter wave transmission circuit (40). The first isolated circuit (20) comprises an adder module (21), an integrator module (22), a first switching circuit (23), a comparator module (24), sequentially connected between the analog signal input interface provided by said first isolated circuit (20) and the input end of said millimeter wave transmitter module (41); said second isolated circuit (30) comprises a second switching circuit (31), a low-pass filter module (32) and an operational amplifier module (33), sequentially connected between the output end of said millimeter wave receiver module (42) and the analog signal output interface of said second isolated circuit (30). Figure to be published with the abstract: Figure 1

The present invention discloses a coding and decoding method for an analog optical isolated amplifier using Σ-Δ modulation technology. The analog optical isolated amplifier includes an encoder, a light source driver, a light source, a light sensor, and a decoder. The method includes: when an input digital signal generates an input pulse rising edge or an input pulse falling edge, generating a first pulse with a predetermined pulse width through the encoder; outputting a coded signal with a plurality of first pulses to the light source driver; driving the light source through the light source driver according to the plurality of first pulses of the coded signal to output a coded optical signal; sensing the coded optical signal through the light sensor to generate a sensing signal, and the sensing signal has a second pulse corresponding to the first pulse; and replicating the input digital signal of the encoder through the decoder according to the sensing signal with a plurality of second pulses.

The utility model provides a charging pile isolation type direct current bus high-voltage detection circuit, which comprises a differential amplification unit, an isolation amplification unit, a filtering shaping unit, a voltage-stabilized power supply unit and a main control unit, and is characterized in that the input end of the differential amplification unit is electrically connected with the output end of a charging module of a charging pile; the DC bus high-voltage signal conversion module is used for converting DC bus high-voltage signals into primary DC voltage signals; the input end of the isolation amplification unit is electrically connected with the output end of the differential amplification unit, and the isolation amplification unit is used for isolating and transmitting the primary direct-current voltage signal and amplifying and reducing the primary direct-current voltage signal into a secondary direct-current voltage signal in proportion; the input end of the filtering and shaping unit is electrically connected with the output end of the isolation amplification unit, the output end of the filtering and shaping unit is electrically connected with the input end of the main control unit, and the filtering and shaping unit is used for filtering and shaping the secondary direct-current voltage signal and sending the signal to the main control unit for data processing; through the differential amplification unit, the isolation amplification unit, the filtering shaping unit and the voltage stabilizing power supply unit, accurate, safe and stable detection of 500V direct current bus high-voltage signals output by the charging pile is realized, the signal processing accuracy and the circuit reliability are improved, and powerful support is provided for real-time monitoring and management of the charging pile.

The utility model relates to the field of servo control isolation, in particular to a servo control isolation device, which improves the stability and the precision of a control system. According to the scheme, the device comprises a control module, a valve position detection isolation module, a current output isolation module and a voltage output isolation module, wherein the valve position detection isolation module, the current output isolation module and the voltage output isolation module are respectively connected with the control module; the valve position detection and isolation module comprises a first operational amplifier (U903B) and a first isolation amplifier (U905), the in-phase input end of the first operational amplifier (U903B) receives an input valve position voltage signal, the inverted input end of the first operational amplifier (U903B) is connected with the output end, the output end is connected with a second pin of the first isolation amplifier (U905), and the first isolation amplifier (U905) is connected with the second pin of the first operational amplifier (U903B). A second pin of the first isolation amplifier (U905) is connected with a third pin of the first isolation amplifier (U905), a first pin of the first isolation amplifier (U905) is connected with a first voltage reference source (B5V), and a seventh pin of the first isolation amplifier (U905) is connected with an ADC part embedded in the control module. The servo control isolation circuit is suitable for servo control isolation.

The utility model provides an isolation type insulation monitoring circuit comprising a bridge switch circuit located at a high voltage side, a first differential conversion circuit and a control unit which are located at a low voltage side, and a first isolation type amplifier which is coupled with the bridge switch circuit and the differential conversion circuit. Wherein the bridge switch circuit comprises a high-resistance voltage divider and a high-voltage relay, a first input end of the first isolation amplifier is coupled with a high-voltage direct-current voltage to be monitored through the high-voltage relay and the high-resistance voltage divider, and a second input end of the first isolation amplifier is coupled with protective grounding; a first voltage detection resistor is arranged between the first input end and the second input end to obtain an insulation sampling voltage, the output end is coupled with the control unit through the first differential conversion circuit and used for outputting an insulation sampling signal to the control unit, and the control unit is further used for outputting a control signal to control the on-off of the high-voltage relay. The high-voltage relay is only switched on during measurement. The isolation type insulation monitoring circuit can realize low-cost convenient insulation monitoring of the charging pile power distribution system.

The utility model discloses a high-voltage isolation detection circuit, which is characterized by further comprising an isolation circuit respectively connected with a voltage division circuit and an operational amplifier circuit, the isolation circuit comprises an isolation amplifier U1 and a capacitor C7 connected with the voltage division circuit and a pin 3 on the isolation amplifier U1, one end of the capacitor C4 is connected with a pin 1 on the isolation amplifier U1, and the other end of the capacitor C4 is grounded; the high-voltage isolation detection circuit provided by the utility model can detect kilovolt voltage, isolates high voltage from low voltage through the arrangement of the isolation circuit, protects electronic components of a low-voltage part from being broken down by the high voltage to cause damage, has the characteristics of high-voltage resistance and small damage to electronic components, and meanwhile, the isolation circuit also detects VINP (Voltage Inertial Inertia Potential). And through the isolation amplifier U1, the whole isolation circuit can be amplified by K times, so that the sampled voltage V1 is changed into K * V1, and the overall detection sensitivity and the high-voltage detection timeliness of the circuit can be improved.

The utility model discloses a frequency converter output over-ground overcurrent protection circuit comprising a sampling unit which is used for collecting current of a W item and outputting a current sampling value after limiting the size of the current; the isolation amplifier U2 is used for isolating and amplifying a power supply input and output to the isolation amplifier U2; and the dual-operational amplifier unit comprises an amplification chip U1A and a comparison chip U1B, the negative input end of the comparison chip U1B is connected with the output end of the amplification chip U1A, the input end of the chip U1A is connected with the isolation amplifier U2, and the chip U1A is used for amplifying a current sampling value and then outputting the amplified current sampling value. The over-current threshold value can be adjusted by modifying the resistance value of the resistor, whether the circuit is over-current or not can be judged through the comparator, output is adjusted through the isolation amplifier U2 and the double operational amplifier unit, and therefore the output over-ground over-current protection circuit is achieved, the circuit is simple, the number of used components is small, and cost is low.

The utility model discloses an alternating-current impedance inspection test system of a galvanic pile in the technical field of electrochemical state monitoring. The alternating-current impedance inspection test system comprises a microprocessor, a control module, an excitation module, a signal acquisition module and a signal analysis module, the microprocessor is in communication connection with the PC terminal and the control module. The excitation module is in communication connection with the control module, is electrically connected with a to-be-tested electric pile, and applies an alternating current excitation current signal and a direct current bias voltage signal to the to-be-tested electric pile; the signal acquisition module is connected with a to-be-tested galvanic pile through a front isolation amplifier, acquires a voltage signal of the to-be-tested galvanic pile and transmits the voltage signal to the signal analysis module; the signal analysis module is in communication connection with the control module and the signal acquisition module, and transmits calculated AC impedance data to a PC terminal through the control module and the microprocessor. The test system provided by the utility model can be used for carrying out alternating current impedance inspection test on a small chamber or a cell under the working state of the high-power galvanic pile, so that the state or fault of the galvanic pile can be conveniently researched and judged, and relevant strategies and solutions can be conveniently formulated.

The utility model provides a current detection and control circuit for a six-path UV lamp group power supply line, which comprises an MCU single chip microcomputer, a main path current detection circuit, A and B branch current detection circuits and a control and display circuit, and is characterized in that the main path current detection circuit comprises a current detection sensor, an enhanced isolation amplifier, a differential filter circuit, a first operational amplifier and a comparator; the A and B branch current detection circuit comprises a first linear current sensor and a second linear current sensor; the control and display circuit comprises a PWM pulse output circuit and a display unit, current detection of a main circuit and a branch circuit of the UV lamp set circuit can be carried out in real time, and meanwhile, PWM pulses can be sent in time to adjust current output of a constant current source, so that larger secondary damage caused by current fluctuation generated by short circuit or open circuit of a lamp set is prevented, and the service life of the lamp set is prolonged. And the problem can be found in time through the current value, and the damaged lamp group can be quickly found.

The invention discloses an ocean equipment distribution line ground fault monitoring system and method, and particularly relates to the technical field of line ground fault monitoring, the ocean equipment distribution line ground fault monitoring system comprises a multi-state sampling module, a self-adaptive resolving module, an isolation transmission module and a fault switching module, four equivalent circuit models are constructed, and time-sharing dynamic sampling of positive and negative grounding resistors is realized; the self-adaptive calculation module synchronously calculates a grounding resistance value and judges a fault by utilizing a self-adaptive compensation algorithm based on simultaneous binary linear equations and combining temperature drift correction and weighted average filtering; the isolation transmission module adopts a high-voltage-withstanding transformer isolation type amplifier, so that reliable signal transmission in a high-water-pressure environment is ensured; the fault switching module cooperates with the mechanical relay through the solid-state relay to realize fault arc-free isolation. According to the invention, the online monitoring precision, safety and environmental adaptability of the grounding fault of the marine equipment distribution line are significantly improved.

The utility model relates to a frequency converter current sampling circuit comprising an isolation amplifier comprising a power supply pin, an input pin and an output pin, the power supply pin is connected with a power supply, and the input pin is connected with the output end of a frequency converter; the input end of the dial switch is connected with the output pin of the isolation amplifier; the first end of the adjusting resistor unit is connected with the output end of the dial switch; the operational amplifier is connected with the second end of the adjusting resistor unit; wherein the dial switch adjusts the gain of the operational amplifier by changing the state of a resistor switch in the resistor unit, and further adjusts the sampling amplification factor of the output current. According to the utility model, by introducing the design of combining the dial switch and the adjusting resistor unit, the gain of the operational amplifier can be flexibly adjusted, so that the sampling amplification factor of the output current is adjusted, and the problem that various power frequency converters cannot be compatible in the prior art is solved.

The utility model provides a power amplification device, relates to the technical field of signal modulation, and realizes modulation and emission of high-frequency signals through a full-bridge switch amplifier and a half-bridge switch amplifier which comprise gallium nitride switches. The high-power-density low-power-consumption high-speed switch has the advantages of being high in power density, low in power consumption, high in switching speed, excellent in thermal stability, low in harmonic distortion, good in linearity, good in anti-interference performance, good in lightning protection performance, high in on-load adaptive capacity and the like. Through the first isolation amplifier and the second isolation amplifier, the driving design of the power amplifier is simplified.

The invention discloses a discrete magnitude circuit for aviation equipment, which comprises a first voltage division circuit used for connecting a discrete magnitude signal to input 0-36V direct current voltage, the first voltage division circuit is used for reducing the direct current voltage to 0-1.16 V and filtering the direct current voltage through a filter, the output end of the filter is connected with an isolation amplifier, and the output end of the isolation amplifier is connected with a first voltage division circuit. One end of the isolation amplifier is respectively connected with a single chip microcomputer and an isolation power supply module, the other end of the isolation amplifier is connected with a contactor through a second voltage division circuit, and the isolation amplifier is used for collecting the current discrete magnitude and inputting the current discrete magnitude to the single chip microcomputer; according to the invention, in a 0-36V discrete control signal, through cooperation of the single-chip microcomputer and the contactor, a grounding state or a disconnection state of electronic equipment on a machine can be automatically controlled and judged, and a discrete magnitude circuit requirement in an ARINC720 standard is satisfied.

The invention discloses an isolated AC / DC voltage sampling and PWM driving control circuit, and belongs to the technical field of integrated circuits. Comprising an analog quantity sampling circuit and a power module upper and lower bridge arm driving protection circuit. Sampled and conditioned signals are connected to the analog input end of the DSP, a PWM output pin of the DSP is connected with the input end of the isolation driving module, and an upper bridge arm and a lower bridge arm of a power tube are driven through the isolation driving module. An analog quantity acquisition processing flow is executed when analog quantity sampling is carried out, a power tube upper bridge arm processing flow is executed when an upper bridge arm power tube is controlled, and a power tube lower bridge arm processing flow is executed when a lower bridge arm power tube is controlled. According to the invention, the clamping module is arranged at the preceding stage of the analog input pin of the microcontroller, so that the analog input pin of the microcontroller can be effectively prevented from being damaged by the high voltage pulse peak of the analog input port. An isolation amplifier and a resistor are adopted for voltage reduction, and voltage bias is added in a post-stage conditioning circuit, so that sampling of alternating current and direct current voltage is realized while the size is reduced.

Disclosed are systems, methods, and apparatus for current monitoring. A current monitor includes a high-voltage side configured to obtain a signal indicating current flowing through a conductor and apply different levels of gain to different frequency bands of the signal to generate conditioned signals. A low-voltage side of the current monitor is electrically isolated from the high-voltage side and configured to split the conditioned signal to generate a plurality of output signals, each indicating the level of current flowing in one of the different frequency bands. An isolation amplifier is configured to transmit the conditioned signal from the high-voltage side to the low-voltage side while electrically isolating the high-voltage side from the low-voltage side.

The utility model discloses a miniaturized broadband receiver, which relates to the technical field of digital receivers and comprises a cavity, an RF signal input port is mounted at the front end of one side of the outer surface of the cavity, and an input impedance matcher is mounted at the bottom end of the shaft surface of the RF signal input port and penetrates through the outer surface of the cavity. A preselection filter is arranged at the rear end of the outer surface of the input impedance matcher, and a low-noise amplifier is installed at the rear end of the outer surface of the preselection filter. The high-efficiency and low-noise level is always kept in the signal transmission process from the receiving end to the output end, meanwhile, mutual interference among different circuits is effectively prevented by using the isolation amplifier, so that the independence and definition of the signals are improved, unnecessary high-frequency components are further filtered out by the level low-pass filter, and the signal transmission efficiency is improved. And the final output signal is cleaner.

The utility model discloses a current sampling circuit capable of switching power through software, which comprises a conversion unit used for acquiring current, converting the current into a voltage signal and uploading the voltage signal; the isolation amplifier U2 is used for amplifying the voltage signal and then outputting the amplified voltage signal; the switching power unit is used for amplifying the amplified voltage signal after adjusting the amplification factor of the post-stage amplification circuit; wherein the switching power unit comprises resistors R1, R3, R5, R8, R10 and R11 and optical relays U3, U4, U5 and U6, the resistors R1, R3 and R5 are connected in parallel and then one end is connected with the isolation amplifier U2, the resistors R8, R10 and R11 are connected in parallel and then one end is connected with the isolation amplifier U2, the optical relay U3 is connected between the resistor R1 and the resistor R3, the optical relay U4 is connected between the resistor R5 and the optical relay U3, the optical relay U5 is connected between the optical relay U6 and the R8, and the optical relay U6 is connected between the R10 and the R11. According to the utility model, the frequency converter power is set on the control panel, so that the influence caused by misoperation can be reduced.

The invention discloses an automatic test method of an isolation amplifier. The automatic test method comprises the following steps: step 1) building a peripheral test circuit of the isolation amplifier; the method for testing the linearity of the isolation amplifier based on the peripheral test circuit can greatly improve efficiency and data stability. The method for testing the linearity of the isolation amplifier based on the peripheral test circuit can be used for testing the linearity of the isolation amplifier based on the peripheral test circuit.

The present invention discloses a power transmission line current sensor, comprising: a Rogowski coil module, whose output signal is a differential voltage signal of the measured current; an integrator module, which converts the differential voltage signal into a voltage signal of the measured current; a DC isolation amplifier module, which filters out DC from the voltage signal of the integrator module, amplifies it, and outputs a power frequency signal and a high-frequency current signal; a high-pass filter module, which filters out the power frequency and its harmonics from the high-frequency current signal, and outputs a high-frequency current signal with a large and small amplitude. The sensor monitors and measures the power frequency current, high-frequency lightning current, and high-frequency partial discharge current of the power transmission and distribution line in real time. The advantage of the present invention is that faults can only be detected by detecting these currents, allowing for effective and real-time monitoring of the safe operation of the line.

The invention relates to a miniaturized multipath motor voltage and current measurement and acquisition circuit module, and belongs to the field of servo mechanism testing. The multi-channel motor voltage and current measurement and acquisition circuit is composed of a four-channel voltage measurement optical coupling isolation amplifier circuit, a four-channel current measurement optical coupling isolation amplifier circuit, an ADS8201 analog-to-digital conversion circuit, an STM32 minimum system and a W5500 embedded Ethernet controller circuit. The four-channel voltage measurement isolation amplifier circuit outputs to the AD conversion circuit through the post-stage differential amplification circuit, and the four-channel current measurement isolation amplifier circuit outputs to the AD conversion circuit after being amplified by five times through the post-stage differential amplification circuit. The AD conversion circuit carries out 12-bit AD conversion in a successive approximation mode, a conversion result is stored in an independent FIFO buffer and then output to the STM32 minimum system circuit through an SPI interface, and then acquired data is packaged and transmitted to upper computer PC end software through an Ethernet interface to be stored, displayed and processed.