137 results about "Isolation amplifier" patented technology

An electronic processing system contains a power supply subsystem and a multi-processor module. Programmable control circuitry manages power consumption in the electronic system by allocating priority among a plurality of competing demands, such as total power consumption, power consumption at any one of the processors, and thermal measurements. Analog sense measurements of incoming power are transmitted to the control circuits, which are protected from noise through use of an isolation barrier established by a linear isolation amplifier.

The present invention is directed to a highly-integrated MEMS-based miniaturized transceiver. The transceiver utilizes a low band front-end to direct sample low band signals and a high band front-end to translate high band signals that cannot be directly sampled to low band before low band front-end processing. The low band front-end comprises an array of High-Q MEMS (microelectromechanical systems)-based filters/resonators separated by isolation amplifiers in selectable cascade with narrower bandwidth filters. Dynamic tuning ability is provided through the isolation amplifiers and the sample frequency of the analog-to-digital converter. This architecture is amenable to monolithic fabrication. The input frequency range is scalable with analog-to-digital conversion sampling rate improvements. Re-utilization of filters is spatially efficient and cost effective. Tuning time is limited only by the analog-to-digital conversion and digital signal processing, not synthesizer settling times. This architecture eliminates major sources of traditional intermodulation distortion and reduces complex hardware, increasing reliability.

The invention provides a digital amplitude-integrated cerebral function monitor (CFM). The CFM comprises a signal acquisition system, a signal amplification system and a signal processing system, and signals are acquired by the signal acquisition system, amplified by the signal amplification system and further processed by the signal processing system, thereby obtaining an amplitude-integrated electroencephalogram (aEEG), wherein, the signal acquisition system is a single-lead or double-lead system; the signal amplification system comprises an isolation amplifier and a main amplifier; and the signal processing system comprises a CFM filter module, an amplitude-squeezing module and a peak detecting and smoothing module. The digital amplitude-integrated CFM provided by the invention has the advantages of low environmental requirements and high anti-interference and anti-drifting performance, and can achieve the continuous bedside detection on a real-time basis for a long time and reflect the changes in the cerebral function of patients on a timely basis.

The invention discloses a multi-functional, high-power, multi-channel, rolling and fast measurement electrical method earthquake comprehensive measuring system used in geological exploration. The system comprises a computer, a system on programmable chip (SoPC) control circuit, a high-voltage power supply, a high-voltage power supply bridge, a current sampling and separation amplifier, a channel input/high voltage output control circuit, a cable, electrodes, a radio-detector, a preamplifier, a filter, an analog to digital (AD) converter and a data storage. The system has the characteristic of multiple functions, and can be used for time-domain electrical exploration, frequency-domain electrical exploration and seismic exploration; when the system is used for measuring electrical signals, the transmitted power can be more than ten kilowatts, so the system has the characteristic of high power; the system can realize multi-channel measurement and rolling measurement so as to greatly improve the working efficiency; and the data in multiple channels are acquired at the same time, and the data sampling speed is up to ten microseconds, so the time precision is improved.

The invention discloses a rapid heat-treatment temperature measuring and controlling system and a measuring and controlling method. The system comprises an infrared pyrometer, a standard K-shaped thermoelectric couple silicon wafer, a temperature signal processor, a thermoelectric couple thermodetector, a heating power regulator, an alternating current zero crossing detector, a timing counter, a controllable silicon control signal isolation amplifier, a controllable silicon heating source, a heating light set and a control computer. The connection relationships of the assemblies are shown as an attached drawing 1 and the whole system is uniformly coordinated by the control computer for controlling, wherein the heating power regulator is internally set in the program of the computer. The temperature measuring and controlling method comprises the steps of measuring and calibrating the temperature by using the standard thermoelectric couple, measuring the temperature by using the infrared pyrometer, controlling the adjustment of the heating power of light by using the timing counter, dividedly controlling the heating light, adjusting the distribution uniformity of the temperature and the like. The invention can carry out self-adaptive PID adjustment on the temperature, has rapid adjustment and controlling reaction and can fully-automatically achieve the rapid temperature measuring and controlling functions.

The invention relates to an online test system for mobile dynamic mist distribution performance, and belongs to the technical field of sprayer test equipment. The system comprises a group of mist distribution acquisition devices; the bottoms of the mist distribution acquisition devices are respectively provided with a weight sensor; the output end of the weight sensor is connected with the input end of an acquisition card; an automatic rewinding reel is arranged on a mobile device; the acquisition card is in communication connection with a portable computer through a data wire; the portable computer is connected with a dynamic control circuit; a 485 communication module of the dynamic control circuit is connected with a corresponding port of a mater chip; and the control output end of the master chip is respectively connected with a motor controlled end and a pressure-regulating valve of a nozzle water supply pump through an isolation amplifier circuit. The online test system tests nozzles on line, and also tests the dynamic spray performance of various nozzles when the flow rate and the water supply pressure are changed so as to comprehensively understand and evaluate the performance of the tested nozzles.

The invention discloses a system and a method for time delay calibration of a Beidou navigation signal hardware simulator. The system comprises a satellite navigation signal simulator, a signal acquisition module, an isolation amplifier and a signal processing module, wherein the isolation amplifier outputs a first clock signal and a second clock signal; the satellite navigation signal simulator takes the first clock signal as a work clock and outputs a radio frequency analog signal and a pulse per second signal; the signal acquisition module takes the second clock signal as a sampling clock and is used for acquiring the radio frequency GEO (geosynchronous) satellite analog signal and the pulse per second signal; and the signal processing module calculates delay inequality between an initial code phase of the radio frequency GEO satellite analog signal and a pulse per second rising edge of the pulse per second signal based on the acquired radio frequency analog signal and the pulse per second signal to obtain the time delay of the simulator. With the adoption of the technical scheme, a special zero-pseudorange or fixed-pseudorange testing scene is not required to be set in the simulator, and the time delay of the simulator can be calibrated when the simulator simulates output normally.

The invention relates to a superconductive strip material alternative current loss tester and a method. The tester comprises a gradient amplifier, a hall current sensor, an isolation amplifier, an industry control computer, a phase-locked amplifier, an object sample and a protective resistance. The method comprises: using the computer to control the OSC of the phase-locked amplifier to output a sine signal of a certain frequency f and a certain amplitude, transmitting the signal via the first-stage isolation amplifier to reach the gradient amplifier, controlling the gradient amplifier to generate a current signal Irms of a same frequency f, generating a loss voltage Vrms on the sample; using the phase-locked amplifier to measure the loss voltage Vrms and the phase phi U; using the hall current sensor and the phase-locked amplifier to measure the phase phi I of the current signal Irms; using the hall current sensor and a data acquisition card to collect the volume Irms of the current signal; and using equations to calculate the alternative current transmission loss of the superconductive strip material. The invention has high automatic degrees, high efficiency, high speed and high test accuracy.

The invention discloses an analog quantity conditioning and distributing device with high precision and all-digital calibration, which comprises an instrumentation amplifier, an isolation amplifier, a verification module and an output drive module, wherein the instrumentation amplifier is used for receiving and treating field signals; the isolation amplifier is used for receiving the field signals processed by the instrumentation amplifier and then performing isolation output on the field signals; the verification module is used for receiving and verifying the signals output by the isolation amplifier; the output drive module is used for receiving the signals from the verification module and outputting the signals to a corresponding system; the verification module is connected with a general calibration device which is used for verifying the field signals output by the verification module; the general calibration device comprises an upper computer controlling the verification process and a calibration instrument controlled by the upper computer to generate standard voltage and current signals and transferring the standard voltage and current signals to the verification module; the upper computer is connected with the verification module through an SPI (serial peripheral interface); and the output drive module is connected with the calibration instrument. According to the invention, a digital potentiometer is adopted to replace a mechanical potentiometer, and the digital potentiometer is operated to change value of resistance through the SPI, so that detuning and linear error of the analog quantity conditioning and distributing device can be eliminated.

The invention discloses an intelligent transformer substation grounding network anti-corrosion and monitoring system, which is composed of a constant potential rectifier, a corrosion on-line detectionsensor, a temperature and humidity sensor, an isolation amplifier, an analog-to-digital converter, a single chip device, an upper computer, a 3G data and image transmission unit, a remote detection client and the like; the signals transmitted by the constant potential rectifier, the corrosion on-line detection sensor and the temperature and humidity sensor are isolated and amplified by the isolation amplifier, enters into the analog-to-digital converter for A/D conversion, the result is converted and transmitted to the single chip to be transmitted to the upper computer, the 3G data and imagetransmission unit, and the remote detection client. The system can achieve the aims of effectively mitigating corrosion on the grounding network, prolonging service life of the grounding network andremote monitoring in real time.

The invention discloses an universal controller of a spaceflight carrier rocket, comprising a control plate, a time sequence plate and an attitude control plate, wherein the time sequence plate comprises M paths of ignition units; the attitude control plate comprises N paths of attitude control drive modules, N paths of attitude control recovery modules, pressure collection modules and remote -measuring power distribution and interruption modules; the control plate comprises a processor DSP (Digital Signal Processor), a programmable logic controller CPLD (Complex Programmable Logic Device), an isolated power supply, an analogue switch, an isolation amplifier, M paths of time sequence recovery modules, M paths of ignition recovery modules, P paths of indication input modules, M paths of time sequence drive modules, a rudder control output module, a rocket-borne CAN isolation drive module, and a ground CAN isolation drive module. The controller is characterized in that controllers in four cabins are combined into one universal controller and has the advantages of modular design, good universality and strong compatibility.

The invention discloses a high-power microwave active protection device. The high-power microwave active protection device comprises a klystron. The output end of the klystron is connected with double directional couplers, and the double directional couplers are sequentially connected with a DC block, a wave detector, an isolation amplifier, a high reflection protection box and a fast protection box. The high reflection protection box is further connected with a microwave source, the fast protection box is respectively connected two digital isolators, and the two digital isolators are connected with a PLC and a high voltage source respectively. According to the protection method of the high-power microwave active protection device, by judging the magnitude of reflection power, signals of the microwave source are cut off timely before ignition, and thus ignition is avoided; meanwhile, a protection measure for faults of a circulator is provided for the microwave devices such as the klystron strict in the reflection power; system reliability is improved, the klystron is protected to be safe, and heavy economical losses are avoided.

The invention discloses a digital converter conversion program of a synchro / rotary transformer. A voltage signal outputted by a synchro / rotary transformer digital converter is isolated and amplified through an isolation amplifier, and is simultaneously sampled by an A / D converters; after the A / D converter completes analog to digital conversion, the microcontroller reads three digital signals outputted by the A / D converter; and through multiplication and division, a look-up table, summation and other operations, a digital angle is outputted. The program of the invention uses software to realize various functions, and has the advantages of simple circuit, high precision, low power consumption, high reliability and low cost.

The invention is suitable for the technical field of SVC device safety detection, and provides a thyristor overvoltage detection circuit used for a TCR type high-voltage SVC device. AC voltage of the two ends of a thyristor is rectified into positive half-wave voltage by a rectification circuit. Positive half-wave generated through rectification is scaled to voltage range of the input end of an isolation amplifier by a high-voltage side differential proportion amplification circuit. Voltage signals detected by a high-voltage side circuit are transmitted to a low-voltage side circuit in an isolation mode by the isolation amplifier. Voltage outputted by the isolation amplifier is amplified and outputted to an overvoltage judgment and comparison circuit by a low-voltage side differential proportion amplification circuit. The detected voltage and an overvoltage threshold value Vref are compared via the judgment and comparison circuit. The thyristor is triggered to be conducted by controlling a thyristor trigger circuit according to the comparison result when the thyristor is overvoltage. The circuit is quite concise, element price is low, and problems that conventional high-voltage thyristor overvoltage detection circuits are high in cost, complicated in circuit and inflexible in overvoltage parameter setting can be solved.

The invention discloses a signal conditioning card, comprising a signal attenuation module, a signal isolation amplifier module and an isolation voltage-stabilized source module, wherein the signal isolation amplifier module is connected with the signal attenuation module; the isolation voltage-stabilized source module is used for providing a working power supply voltage for the signal isolation amplifier module; the signal attenuation module comprises a first relay unit, a second relay unit and an attenuation unit; the attenuation unit is respectively connected with the first relay unit and the second relay unit; the signal isolation amplifier module comprises an isolation unit and a signal amplifier unit; the isolation unit is connected with the second relay unit; and the signal amplifier unit is connected with the isolation unit. In addition, the signal conditioning card also comprises a driver module and a decoder; the driver module is connected with the first relay unit and the second relay unit; and the decoder is connected with the driver module. The signal conditioning card has the advantages of isolating input signals from output signals, protecting measuring instruments,ensuring follow-up precision values on measuring PXI equipment, improving use flexibility of the measuring instruments, and being simple in circuit and strong in practical applicability.

The invention discloses a bus throttle and a control method thereof. The bus throttle comprises an electronic throttle, an engine ECU, a main controller and a wireless remote-control device, wherein the CAN line of the engine ECU, the CAN line of the main controller, and the CAN line of the wireless remote-control device are connected in parallel to a CAN 1939 bus, and an engine controller and the main controller perform signal communications through the CAN bus; after converted by a U/I isolation amplifier, the output signals of the electronic throttle enter the main controller. The invention further discloses a control method based on the bus throttle. According to the control method disclosed by the invention, the electronic throttle of analog quantity is converted into the bus throttle, under the conditions that the wireless remote-control device is adopted and any engine is configured, the electronic throttle and the wireless throttle can respectively and normally work.