140 results about "Isolating amplifier" patented technology

The invention puts forward an electric automobile power battery major loop circuit relay failure detection circuit and method. The circuit comprises a whole vehicle interface circuit, a normally close low voltage relay, a current-limiting resistor, a high voltage optical coupler, a voltage dividing resistor, an isolating amplifier and a power source module, wherein one end of a contact point of the normally close low voltage relay is connected with an anode of a low voltage storage battery while the other end of contact point of the normally close low voltage relay is connected with a control end of the high voltage optical coupler via the current-limiting resistor, and one end of a low voltage relay wire coil is connected with an ACC gear power source while the other end is connected with a cathode of the low voltage storage battery; electricity is supplied to the isolating amplifier and the power source module via the low voltage storage battery, and two ends of a voltage dividing resistor circuit are respectively connected onto a downstream part of a main positive contactor contact point and an upstream part of a main negative contactor contact point. The electric automobile power battery major loop circuit relay failure detection circuit and method are simple in wire connection, convenience of whole vehicle arrangement can be realized, and main positive and negative contactor adhesion faults of a power battery can be detected off-line in a low power consumption and high reliability manner. After the whole vehicle is powered on, the detection circuit is invalidated, and effects exerted on other detection methods can be reduced.

An operation amplifier drive circuit for eliminating the bias voltage of operation amplifier comprises an operation amplifier with a chopper, a first input, a second input and an output, a first switch for receiving an input voltage to be connected to the first input of the operation amplifier, a second switch connected with the first input and the output of the operation amplifier, a third switch connected with the second input and the output of the operation amplifier, and a capacitor connected with the second input of the operation amplifier. The output of the operation amplifier directly discharges and charges the capacitor, and the polarities of the first and the second inputs of the operation amplifier can be exchanged, therefore, the drive circuit can avoid improving the drive ability of input signal, shorten the discharge / charge time of capacitor and eliminate bias voltage.

The invention discloses an automatic testing system of characteristic parameters of a direct-current breaker, which consists essentially of an analyzing and managing system controlled by a computer, a digital storage oscillograph and a program-controllable direct-current power source. 12-bit digital values that are output by a single chip microcomputer output 0 to 5V voltage through a digital-to-analog converting circuit, and the voltage is output to a phase-shifting-control full-bridge zero-voltage switching and a pulse modulation converting circuit through an isolating amplifier as well as to an EA+ end of a main chip, thus changing output current. The electromagnetic tripping action time is measured by a waveform breaking method and taking the largest constant short-circuit current in electromagnetic instantaneous acting tripping as the starting point of timing, thus having the advantages of high accuracy, efficiency and reliability.

The invention relates to a voltage collecting circuit for monomer batteries of a battery pack. After voltages of the monomer batteries of the power battery pack are isolated and sampled by employing a solid-state relay, a signal conditioning and isolating circuit and a microcontroller in a matching manner, the voltages are fed into an A / D (Analog-to-Digital) passage of the microcontroller for analog-to-digital conversion; the microcontroller is used for rapidly controlling two paths of solid-state relays connected with two electrodes of any monomer battery to operate at the same moment, thus, a terminal voltage of the corresponding monomer battery can be obtained on a sampling bus; simultaneously, as for electrical security, a terminal voltage signal, obtained from the battery pack, of the monomer battery needs to be isolated by an isolation amplifier, then can be input to the A / D passage of the microcontroller; and the process above is suitable for the voltage collecting circuit for the monomer batteries of the power battery pack. The circuit is low in cost, simple and practical, as well as safe and reliable.

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 discloses a device and a method for automatically testing the performance of a steering engine servo valve. The device comprises a tested steering engine, a hydraulic system and a circuit system, and is characterized in that: the hydraulic system consists of a hydraulic source, a steering engine oil supply oil way, a steering engine balancing valve oil supply oil way and an oil return oil way; in the circuit system, a digital / analog (D / A) analog output board card and a voltage / current (V / I) conversion isolating amplifier are arranged on a servo valve current control circuit of the tested steering engine; a displacement sensor is arranged at an output end of an electro-hydraulic steering engine power piston; and during test, control software of a measurement and control computer outputs current to the servo valve through the D / A analog output board card and the V / I conversion isolating amplifier according to a control rule determined by the selected testing items, controls movement of the power piston, acquires displacement of the power piston, records control voltage of the servo valve current, movement time of the power piston and other data, and processes and computes the data so as to automatically determine whether the performance of the servo valve meets requirements of related indexes. The device has high testing degree of automation, high precision and good application and popularization prospects.

The invention discloses an IGBT (insulated gate bipolar transistor) short-circuit protection circuit in a frequency converter and a method thereof. The circuit comprises a time-delay circuit, an isolating amplifier circuit, a comparison circuit and a drive circuit, wherein the input terminal of the time-delay circuit is connected with the switching signal of the IGBT, and the output terminal of the time-delay circuit is sequentially connected with the isolating amplifier circuit and the comparison circuit; and the drive circuit adopts an IR2110 driving chip with the SD input terminal thereof being connected to the output terminal of the comparison circuit and the output terminal thereof being connected to the IGBT. The method comprises the steps of time delay, isolation amplification, comparison and driving, wherein the IGBT is switched on and off by using the IR2110 driving chip of the drive circuit. By externally connecting the simple time-delay circuit, the isolating amplifier circuit chip and the typical comparison circuit to the SD input terminal, the invention can achieve the short-circuit protection for the IGBT, ensure that the circuit structure is simple and the response is timely and reliable and greatly reduce the cost.

The invention provides an intelligent window which comprises a remote controller, a sensor group, a controller, an isolation amplifier, a first steering engine, a second steering engine, a controlled window and a connecting structure, wherein the first steering engine and the second steering engine are mounted on walls at the upper end and the lower end of the outer side of a fixed edge of the controlled window, and the first steering engine, the second steering engine and the controlled window are fixedly connected through the connecting structure. The intelligent window has the advantages of high sensitivity and control precision, fine stability, simple structure, assembly flexibility, convenience in use and the like, and can be widely applied to production and life.

The invention relates to an electric automobile power management system based on a single chip microcomputer. The power management system is characterized in that the single chip microcomputer, a data acquisition module, a charging and discharging circuit, a battery pack module, a touch screen and a protection circuit are included; the data acquisition module comprises a current acquisition part, a voltage acquisition part and a temperature acquisition part; the battery pack module comprises a battery grouping circuit and an isolating amplifier circuit; the single chip microcomputer is in two-way connection with the touch screen, the current acquisition part, the voltage acquisition part and the temperature acquisition part simultaneously, the output end of the single chip microcomputer is connected with the input end of the protection circuit and the input end of the charging and discharging circuit, the output end of the protection circuit and the output end of the charging and discharging circuit are connected with one end of the battery grouping circuit, and the other end of the battery grouping circuit is connected with the input end of the current acquisition part, the input end of the voltage acquisition part and the input end of the temperature acquisition part simultaneously through the isolating amplifier circuit.

The power source characteristic measuring instrument includes voltage measuring circuit and current measuring circuit. The voltage measuring circuit includes the first operation amplifier with non-inversion input end connected to voltage source, the first relay, the second relay and the third relay for switching the voltage measuring circuit to simulate cell, charger or discharger. The current measuring circuit contains additional second operation amplifier and four resistors to constitute one differential amplifier and one other resistor connects between the two input ends of the differential amplifier.

The invention discloses a multipoint electric automobile insulation test system and a detection method thereof. A test system circuit comprises a power battery, a battery voltage sampling circuit, a multichannel voltage switching circuit and isolation amplifier unit, a voltage measuring and controller unit, a multi-monitoring-point switching circuit and an equivalent insulation resistor set for k monitoring points of anode and cathode pairs of a power battery, wherein k is an positive integer larger than or equal to one. The detection method comprises three steps, and the insulation condition of all detection points and the power battery can be acquired respectively through detection and calculation. The multipoint electric automobile insulation test system is simple in circuit and low in cost, and under the AD condition that 12 or more bits are selected, the measuring precision is better than 2.5%. The switching path numbers of monitoring points only need to be increased, the insulation condition of the power battery of an electric automobile to all the monitoring points can be measured randomly, and the traveling safety of the electric automobile can be guaranteed.

The invention relates to a protective device and a protective method for an automotive direct current brush motor of a current-free sensor. Two input ends of a current acquisition circuit of the device are respectively connected with a drain electrode and a source electrode of a field effect tube switch T1 in a motor H-bridge control circuit, the output of the current acquisition circuit is connected with the input of an isolating amplifier circuit, the output of the isolating amplifier circuit is connected with the input of a motor control and protection circuit, and the output of the motor control and protection circuit is connected to a grid electrode of the field effect tube switch T1. The protective device acquires voltages at two ends of the field effect tube to amplify, process and calculate the current to make a motor protecting model, a feedback temperature model calculates field effect tube switch junction temperature and rating data is used for judging the process difference so as to amend current, an AMT system in a short-circuit condition can be protected, the performance and the stability of the AMT can be improved, and the protective device has simple circuits and is fast in speed response and strong in reliability, not only can protect the motor quickly, but also can be prevented from generating harmful and mistaken response in emergency.

A DC current regulator circuit comprises a first circuit node (32) which is operable to receive an external input voltage. A transistor (M1) has an input, a first leg and a second leg. The first leg of the transistor is isolated from the first circuit node (32). An amplifier (10) has an output connected to the input of the transistor (M1), a first amplifier input for receiving a reference voltage (VREF) and a second amplifier input connected to the first circuit node (32). A low-pass filter (33) connects between the output of the amplifier and the first circuit node (32). A current mirror (36) connects in series with the second leg of the transistor (M1) and has a first branch (38) for providing a regulated output current and a second branch (37) which connects to the first circuit node (32). The current regulator has reduced sensitivity to conducted EMI received at the first circuit node (32).

The invention provides a dynamic tester with a detection signal and power supply isolation function. The tester comprises an RS485 communication circuit, a starting circuit and a Hall current sensor circuit, wherein an input end of a first isolated amplifier module circuit is connected with an input voltage detection signal, and a signal output end is connected with a singlechip circuit; an inputend of the Hall current sensor circuit is connected with an input current detection signal, and an output end of the Hall current sensor circuit is connected with a signal input end of a second isolated amplifier module circuit; an output end of the second isolated amplifier module circuit is connected with the singlechip circuit; the RS485 communication circuit, the starting circuit, a relay starting circuit and a buzzer starting circuit are respectively connected with the singlechip circuit; a third power circuit is connected with the first isolated amplifier module circuit and the second isolated amplifier module circuit; a fifth power circuit is connected with the Hall current sensor circuit; and a seventh power circuit is connected with the singlechip circuit and the RS485 communication circuit. The scheme guarantees full isolation of input and output signals with power supply, over-voltage cannot occur, and the safety is greatly improved.

The invention discloses an isolation amplifier circuit based on a Sigma-Delta modulation mode. The isolation amplifier circuit comprises a buffer module, a Sigma-Delta modulation module, an on-chip transformer, a Sigma-Delta demodulation module and a filter output processing module. An input signal is input into the Sigma-Delta modulation module through the buffer module to obtain a high-frequencymodulation pulse signal. The Sigma-Delta demodulation module demodulates the high-frequency pulse signal transmitted by the on-chip transformer, filters out a high-frequency component through a filter after demodulation, and obtains an original analog differential input signal through an output processing unit. Defects of photoelectric coupling nonlinear transmission, incapability of differentialsignal transmission by a capacitance isolator and poor noise suppression capability are eliminated by utilizing a transmission mode of an on-chip transformer. Meanwhile, a negative feedback modulation system in the Sigma-Delta modulation module is used for achieving noise shaping, higher precision is achieved, analog Sigma-Delta demodulation is adopted in the demodulation part, and compared witha traditional digital down-sampling filter demodulation scheme, the circuit design is simpler, and the occupied area is smaller.

Interconnect and preamplifier designs are described for use in a disk drive with a common signal return lead system that interconnects a plurality of read transducers (readers) in a slider through the suspension to the preamplifier mounted on the actuator. Preamplifier embodiments have an isolated differential amplifier for each of the plurality of readers in the slider. The set of signal traces in the suspension include a common signal return lead for the plurality of readers in the slider. A preamplifier circuit design according to an embodiment of the invention includes isolated amplifiers for each reader with a separate bias source and power supply isolation elements for both power supply polarities for reduced crosstalk signal and noise between amplifiers.

The invention provides a high-side current detection device and system. The high-side current detection device comprises a sampling circuit, an isolation amplifier, a signal processing circuit and ananalog-to-digital conversion circuit. The first end of the sampling circuit is electrically connected with a power supply. The second end of the sampling circuit is electrically connected with a load.The isolation amplifier is connected in parallel with the two ends of the sampling circuit. The isolation amplifier is used for detecting voltage drop at two ends of the sampling circuit to obtain first detection voltage. The input end of the signal processing circuit is electrically connected with the output end of the isolation amplifier. The signal processing circuit is used for obtaining thefirst detection voltage and carrying out filtering and amplification processing on the first detection voltage to obtain a second detection voltage. The analog-to-digital conversion circuit is electrically connected with the output end of the signal processing circuit. The output end of the analog-to-digital conversion circuit is used for being electrically connected with an upper computer. And the analog-to-digital conversion circuit is used for acquiring a second detection voltage, converting the second detection voltage from the analog signal into a digital signal and sending the digital signal to the upper computer so as to determine the current value of the load.

The invention relates to a device and method testing common-mode input impedance of an operation amplifier. The device comprises a circuit formed by connecting a resistor with a switch in parallel, wherein one end of the parallel circuit is serially connected with an alternating-current signal source. When the common-mode input impedance of the operation amplifier is tested, a resistor is adoptedto form the parallel circuit with the switch, wherein the resistance value of the resistor is the same as the common-mode input impedance design value of the operation amplifier to be tested or is lower than the same by one magnitude order, the alternating-current signal source, the parallel circuit and the operation amplifier to be tested are sequentially connected, the switch is switched on oroff, and output voltages VL1 and VL2 of the operation amplifier to be tested are respectively tested; and the input resistance of the operation amplifier to be tested is figured out through a formula, and the common-mode input impedance of the operation amplifier to be tested is figured out according to the input resistance. The method can be used for testing the large-resistance common-mode input impedance of the operation amplifier so that the property of the operation amplifier is accurately displayed.

An apparatus, which may be configured as a receiver or transceiver, includes a plurality of super regenerative (SR) amplifiers coupled in parallel, wherein the SR amplifiers are tuned to distinct frequency bands, respectively. The apparatus may further include isolation amplifiers at the respective inputs and outputs of the SR amplifiers to prevent injection locking and reduce power leakage. The apparatus may include a circuit to reduce or substantially eliminate in-band jamming signals. The apparatus may form at least part of a wireless communications device adapted to receive signals from other wireless communications devices, adapted to transmit signal to other wireless communications devices, and adapted to both transmit and receive signals to and from other wireless communications devices.

The invention relates to a transmission device for testing capacity of a phase noise measuring system. The transmission device comprises a first high-stability crystal oscillator and a second high-stability crystal oscillator, wherein the first high-stability crystal oscillator is connected to a microwave phase detecting port through a first gating switch via a first frequency multiplier, a firstphase-locked loop, a first low-noise voltage-controlled oscillator, a first isolation amplifier, a second frequency multiplier, a first comb-spectrum generator, a first comb filter, a first power amplifier and a first microwave source; the first isolation amplifier is also connected with the first phase-locked loop; the second high-stability crystal oscillator is connected with the microwave phase detecting port through a second gating switch via a second frequency multiplier, a second phase-locked loop, a second low-noise voltage-controlled oscillator, a second isolation amplifier, a fourth frequency multiplier, a second comb-spectrum generator, a second comb filter, a second power amplifier and a second microwave source; and the second isolation amplifier is also connected with the second phase-locked loop. The transmission device disclosed by the invention has important significance for enhancing the testing proficiency of the phase noise measurement.

The invention discloses a stage control system and a stage control method for a digital multiplex (DMX) 512 intelligent distribution isolating amplifier, which belong to the technical field of stage control and aim to realize the remote, centralized and intelligent interaction of stage equipment, finish various settings and set and acquire state data. The stage control system comprises a control system, wherein the control system consists of a master DMX512 intelligent distribution isolating amplifier, a plurality of concatenated slave DMX512 intelligent distribution isolating amplifiers, a receiving circuit of stage equipment and a wireless transmitter; output DMX512 signals of the master DMX512 intelligent distribution isolating amplifier can be connected to the DMX512 signal input of the slave DMX512 intelligent distribution isolating amplifiers, and can be concatenated for many times; and each group of intermediate and final output DMX512 signals is connected in series to the next stage equipment as the DMX512 signal input of the stage equipment, finally connected to the wireless transmitter at the tail end of the whole link, and wirelessly received by the master DMX512 intelligent distribution isolating amplifier to form a DMX512 feedback loop. By the system and the method, intelligent improvements of a stage equipment system can be achieved, working strength can be weakened, working efficiency can be improved, high speed, accuracy and safety can be ensured, and the occurrence of safety accidents is avoided.

The invention provides an electric potential monitoring device used for plasmas in a space environment. The electric potential monitoring device comprises an electric potential sensor, a microprocessor, a D / A (digital / analog) converter, an A / D (analog / digital) converter, a high voltage amplifier, a pre-amplifier and an isolation amplifier. The microprocessor is used for controlling the D / A converter to output scanning voltage. The high-voltage amplifier is used for performing high-voltage amplification on the scanning voltage and inputting the amplified scanning voltage into the electric potential sensor. The electric potential sensor is driven by the scanning voltage to detect electric potentials of the plasmas in the space environment, and generated current signals are input into the pre-amplifier and the isolation amplifier sequentially for pre-amplifier and isolation amplification sequentially and then output via the microprocessor after being subjected to analog-digital conversion. The electric potential monitoring device has the advantages that by means of high voltage amplification, the scanning voltage in a large range is provided, and plasma density in a large range can be measured, so that electric potentials of the plasmas in the space environment can be monitored effectively.

The invention relates to a grounding fault monitoring system for a distribution line of marine equipment. The grounding fault monitoring system comprises sampling resistors, sampling switches, a self-check change over switch, a grounding sampling resistor, an isolation amplifier, an analog-to-digital converter, a microcontroller, a mechanical relay and a solid state relay, wherein the upper end of a positive end sampling resistor is connected with a positive pole conductor for the distribution line; the lower end of the positive end sampling resistor is connected with the upper end of a positive end sampling switch; the upper end of a negative end sampling resistor is connected with a negative pole conductor for the distribution line; the lower end of the negative end sampling resistor is connected with the upper end of a negative end sampling switch; the upper end of the self-check change over switch is connected with the negative pole conductor for the distribution line; the lower end of the positive end sampling switch, the lower end of the negative end sampling switch and the lower end of the self-check change over switch are connected with the upper end of the grounding sampling resistor; two ends of the grounding sampling resistor are connected with the isolation amplifier; the isolation amplifier is connected with the analog-to-digital converter; and the analog-to-digital converter is connected with the microcontroller. The grounding fault monitoring system for a distribution line of marine equipment can monitor all the grounding fault situations for the positive-pole and negative-pole conductors in the distribution line of marine equipment, including the situation that only a grounding fault occurs only in one conductor or both in two conductors, and can realize grounding fault monitoring for the distribution line when the marine equipment is running.

The invention discloses a measurement method of transformation of a refined structure constant and a system with the same applied, and belongs to the technical field of atomic frequency standards. The system comprises an atomic clock group and a counter group, wherein the atomic clock group is composed of at least two atomic clocks, and the counter group is composed of at least two counters. Each atomic clock comprises an atomic clock physical system, an isolation amplifier, a frequency stability tester, a high-stability signal source, a micro-controller, a digital / analog (D / A) conversion module and a constant flow source module. According to the measurement method, the micro-controllers carry out measurement on output constant frequency of various atomic clocks in the atomic clock group through the counter group, wherein the frequency drifting is conducted on the atomic clocks, the output frequency output everyday by each atomic clock is represented through power series of the refined structure constant, and the transformation situation of the refined structure constant along with time is detected out. According to the measurement method of the transformation of the refined structure constant and the system with the same applied, transformation of the output frequency of a plurality of atomic clocks can be really reflected, and accordingly the transformation situation of the refined structure constant can be accurately measured out.