18 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 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 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.

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 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 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 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 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.

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 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.

The present invention provides a satellite-borne thruster constant current drive control circuit suitable for wide input voltage, comprising: a thruster control module, a PMOS tube drive module, a differential isolation amplifier module, a state acquisition module, a current feedback comparison module, and an NMOS tube drive module. The thruster drive current is input to the differential isolation amplifier circuit in the form of a voltage signal through a current sampling resistor, thereby converting the current signal into a voltage signal. The amplified voltage signal is compared with the reference voltage to control the real-time on-off of the NMOS tube, thereby achieving precise and stable control of the thruster load current. The present invention solves the problem that the satellite-borne thruster cannot adaptively operate normally under a wide input satellite bus voltage (28V~100V). The control and state acquisition of the satellite-borne thruster with a wide input satellite bus voltage (28V~100V) are realized, and the circuit application is flexible, the bus adaptability is strong, the response speed is fast, and the reliability is high.