178 results about "Pulse shaping circuits" patented technology

The invention discloses an integrated multi-channel synchronous vibration data acquisition, monitoring and analysis diagnosis device. The data acquisition unit comprises a signal conditioning circuit, an anti-aliasing filtering circuit, a multi-channel synchronous sampling chip, a system control logic unit, a pulse-shaping circuit (16), a phaselocking frequency multiplication chip and a microprocessor CPU, wherein the system control logic unit comprises a channel configuration logic unit, a clock generation logic unit, a rotating speed measurement logic unit, a sampling control logic unit and a frequency divider, and the data acquisition unit (1) is directly connected with a plurality of eddy current vibration displacement sensors, ICP type piezoelectric vibration acceleration sensors or magnetoelectric vibration speed sensors, and has an interface of a single-channel direct-connected eddy-current, photoelectric or magnetoelectric key phase / revolution speed sensor and so on. The CPU core board is connected with a computer or a palm computer through a network and a USB or a serial interface and finishes the data acquisition for monitoring and analysis diagnosis.

The invention provides a power on reset circuit, comprising a voltage detecting module, a Schmitt trigger, a phase inversion control module and a pulse shaping circuit, wherein, in a power on progress of a power supply, the voltage detecting module detects voltage change of the power supply and outputs a sampling signal; the sampling signal enters the Schmitt trigger and outputs a step signal; onone hand, the step signal is output to the voltage detecting module for controlling rapid effusion of the voltage detecting module so as to lower the sampling signal; on the other hand, the phase of the step signal is inverted through the phase inversion control module and then the step signal is used for controlling switching effusion of the voltage detecting module; at last, the step signal is delayed and treated through XOR operation by the pulse shaping module, and then a power on reset signal is output. Design of the power on reset circuit provided by the invention is simple in structure; by utilizing delaying characteristics of two paths of feedback control signals and the Schmitt trigger, the power on reset circuit has very high stability and good anti-noise performance; and, afterpower on is finished, static power consumption of the power on reset circuit is very low.

The invention provides a single input pin on an integrated circuit chip that serves multiple functions during normal, test, and program modes. A first voltage detector detects a first predetermined high voltage level to place an integrated circuit in test mode. A second voltage detector detects a second predetermined high voltage level to place the integrated circuit in program mode. A high level switch is triggered to activate a pulse shaping circuit, which ramps up voltage gradually to prevent causing damage to programmable cells.

An electrical control system for an engine includes a power supply system that supplies electric power to an engine control unit. The system has a power source connected to the engine control unit via a locking relay. The relay includes an exciting coil that is energized by electrical power when a main switch is closed. The control unit comprises a tacho-pulse shaping circuit or a fuel pump drive circuit that outputs a signal that prolongs the energized state of the coil after the main switch is opened. The signal prolongs the energized state of the coil for a preset time.

A control unit (10) superimposes command signals on AC power passing on a power line or network (40). A command unit (20) controls and powers an electrical load (50) such as a motor M. A command processor (26) receives radio frequency control signals at a first input (24) from an antenna (12) and a receiver / demodulator (22) and receives command signals from the power line at a second input (25) connected with a pulse shaping circuit (23). In a first, normal operating mode, the command processor controls the electrical load in accordance with signals received at the radio frequency input. In a second, special mode initiated power line command signals, the command processor at least temporarily blocks the execution of commands received at the radio frequency input.

The invention provides a semiconductor laser device driving circuit which comprises a pulse shaping circuit used for shaping a wave form of an input narrow pulse signal and further compressing the pulse width of the narrow pulse signal, and a power amplification circuit connected with the pulse shaping circuit and used for performing power amplification on the narrow pulse signal output by the pulse shaping circuit through using high voltage, and for outputting a high level of the narrow pulse signal to an anode of a laser device and a low level to a cathode of the laser device after the power amplification. According to the semiconductor laser device driving circuit, the pulse width of the narrow pulse signal is further compressed by the pulse shaping circuit, and power of the narrow pulse signal is increased by the power amplification circuit, so that the semiconductor laser device driving circuit can meet requirements of high power and a narrow pulse.

A SRD narrow pulse signal generator basis on clock drive belongs to the electronic technical field, which relates to the technique of super wide-band communication, pulse radar and pulse source. The generator comprises a clock source, a coupling capacitance, a resonance matching circuit, a pulse forming circuit and a pulse shaping circuit. The invention has simple circuit and convenient modulation. Complexity and power consumption of the circuit is reduced under the help of automatic bias circuit of SRD which is formed by the matching network and the load resistance, extended power consumption and thermal noise of the circuit are further reduced since all the resonance matching circuits adopt reactive element, particularly a lumped inductance L3 and a Schottky diode are introduced to be a shaping circuit, pulse stretching is effectively inhibited, and pulse delay fall time is greatly compressed, and simultaneously the problem of pulse side lobe and overshoot can be effectively solved. Narrow pulse signals which are generated by the invention have good wave shaping symmetrical characteristic, which can be used as triggering source of gaussian pulse of higher order differential with high quality and signal source of super broadband wireless communication and impacting radar.

The invention relates to a method and a device for low-voltage arc fault detection. The device for low-voltage arc fault detection comprises a current transformer, an I / V converting circuit, an operational amplifying and rectifying circuit, a pulse shaping circuit and a micro controller which are sequentially connected. According to the invention, the current transformer detects load current signals, the I / V converting circuit converts the current signals into corresponding voltage signals, the voltage signals are inputted into the operational amplifying and rectifying circuit so as to be amplified and rectified to acquire absolute value signals with an appropriate proportion, the absolute value signals are shaped by the pulse shaping circuit so as to form rectangular pulse signals, the micro controller captures the pulse width time of pulse signals outputted by the pulse shaping circuit and judges whether the current waves at present are arc fault half waves or not through judging whether the pulse width time variation rate corresponding to current half waves of an adjacent period exceeds a threshold value under a corresponding current level or whether high-frequency impulses are captured continuously, thereby being capable of accurately detecting general load arc faults, cutting off the circuit in time, and ensuring the safety in electricity utilization.

The invention discloses a grain cleaning loss detection method for a combined harvester and a device thereof. An array type piezoeletric quartz sensor is installed at the outlet of a cleaning sieve, the signal output from the array type piezoeletric quartz sensor is transmitted into a charge amplifier and a gain adjustable circuit to be processed and converted into a voltage signal with a certain amplitude value; a high pass filtering circuit and a sensitivity regulating circuit are used to respectively separate out the features of the vibration noise and the grain signals from the frequency domain and the time domain; the separated vibration noise and grain signals are rectified into standard pulse signals which can be executed by a micro monolithic processor through a pulse shaping circuit; the grain cleaning loss is detected by the method of full-width distribution of multi-lamella piezoelectric detection array, information is acquired from multiple areas and multiple angles, thereby enhancing the grain impact signals, improving the grain-grass identification precision and improving the testing reliability of the system; the detecting device has the advantages of good integral dynamic performance, strong anti-jamming capability, and high measurement precision, thereby realizing online measurement of the cleaning loss in the field.

The invention discloses a pulse modulation drive circuit of a miniature semiconductor laser. The pulse modulation drive circuit comprises an external power supply interface circuit, a pulse generating circuit, a pulse shaping circuit, a high-speed pulse amplifier circuit, and a laser driver main power generation circuit. When the provided pulse modulation drive circuit is applied to the semiconductor laser, the power consumption and heating value of the semiconductor laser can be reduced; and the circuit has a small size and is suitable for a hand-held semiconductor laser with the small physical space. Meanwhile, the circuit has characteristics of simple structure, reliable performance, fast pulse response, high pulse output power, and high anti-interference performance.

The invention provides an integrated pre-amplifier used for a charged particle detector. The integrated pre-amplifier comprises a signal preprocessing circuit, a charge sensitivity pre-amplification circuit, a pulse shaping circuit and a direct-current biasing circuit. The signal preprocessing circuit is used for preprocessing a charge signal generated by the detector and outputting a pulse signal; the charge sensitivity pre-amplification circuit is used for converting the pulse signal output by the signal preprocessing circuit to a voltage signal; the pulse shaping circuit is used for carrying out pulse shaping output on the voltage signal output by the charge sensitivity pre-amplification circuit; the direct-current biasing circuit carries out biasing on the quiescent operating point of an amplifier in the charge sensitivity pre-amplification circuit and the quiescent operating point of an amplifier in the pulse shaping circuit through resistor voltage division; the signal preprocessing circuit, the charge sensitivity pre-amplification circuit, the pulse shaping circuit and the direct-current biasing circuit are integrally connected. The integrated pre-amplifier can achieve measurement of charged particles with sedimentary energy larger than 57 keV.

A device for determining a rotational number of an electric dc motor which drives a moving body of an automobile accessory such a sunroof, or a glass pane of a power window includes a switched capacitance filter for eliminating noise from the motor, a cutoff frequency of the switched capacitance filter being dependent on a clock input thereof; a pulse shaping circuit for generating a ripple pulse signal indicative of the rotational number of the motor by wave-shaping an output of the switched capacitance filter; and a pulse generating circuit providing an output pulse signal so as to establish a condition wherein the frequency of the ripple pulse signal is equalized to the cutoff frequency of the a switched capacitance filter.

A DC offset cancellation circuit that is capable of canceling a DC offset voltage occurring between a pair of differential output signals of a differential amplification circuit, while preventing a signal waveform from being distorted due to accumulation of AC components and a photo-electric pulse conversion circuit that is capable of generating an electrical pulse signal that accurately reproduces a rise timing and a fall timing of an optical pulse signal by canceling the DC offset voltage are provided. A photo-electric pulse conversion circuit is provided with a photodiode, an I-V conversion circuit, a first differential amplification circuit having a DC offset cancellation circuit, a second differential amplification circuit, a reference voltage generation circuit, and a comparison circuit. The DC offset cancellation circuit uses a changeover circuit to change a state of a low-pass filter with a hold function in synchronization with an inversion electrical pulse signal, and performs a negative feedback of a filtered signal which is generated by subjecting third differential signals to low-pass filtration or a hold filtered signal which is a filtered signal held during changeover.

A photon counter bases on program logic for photoelectric information in faintness photoelectric information dispose technology. It relates to impulse amplify circuit, impulse discriminate circuit, impulse plastic circuit, controlling circuit for counting door and photoelectric counting circuit. The circuit of amplify, discriminate and plastic realize the magnifying of faintness photoelectric current, the identifying of impulse signal and the plastic of wave and realize the join with the hardware circuit of program logic (PLD). Its character is that PLD realizes the design of photons counting circuit and controlling circuit for counting door. The photons counting circuit uses for photons counting, numerical value lock and store and output, and the controlling circuit for counting door controls the counting time of photons counting circuit and its counting time is adjustable, automatically recorded into set time and repeated to count time.

The invention provides a microwave VCO directly-modulated high-linearity frequency modulated signal generating circuit. According to the microwave linearity frequency modulated signal generating circuit, frequency sweeping linear precision and frequency sweeping rate of more than two orders are not limited, and frequency modulated continuous wave radar intermediate-frequency spurious signals caused by cross mixing can be restrained. According to the technical scheme, a monostable pulse shaping circuit performs shaping on input periodic pulse signals for triggering frequency sweeping signals to form pulse signals with the pulse width equal to the frequency sweeping time in one period, nonlinear inclined-down sawtooth wave voltage signals generated by a C-R differentiating circuit are overlaid on a direct-current bias voltage V0, a frequency sweeping control voltage signal compensated with nonlinear frequency modulated voltage-frequency characteristics of a microwave VCO (4) is formed, and the oscillation frequency of the microwave VCO is controlled to change linearly with the passage of time. The pulse signals generated by shaping control a microwave switch to perform gating on the output of the microwave VCO, and the interference of the intermediate-frequency spurious signals generated by short-distance strong echoes on the work of the radar is restrained.

The invention belongs to the technical field of flow measurement, and relates to a CPLD-based vortex shedding flowmeter. The vortex shedding flowmeter comprises a supply voltage conversion circuit, a piezoelectric sensor used for generated vortex shedding signals, a front end signal processing circuit, a standard pulse shaping circuit, the CPLD and a peripheral circuit thereof as well as a crystal oscillator circuit for providing a clock for the CPLD and a precision voltage flow conversion circuit, wherein, the piezoelectric sensor, the front end signal processing circuit and the standard pulse shaping circuit are sequentially connected, and PWM signals output from the standard pulse shaping circuit are sent to the CPLD; the CPLD stores a lookup table which reflects the corresponding relation between the vortex shedding frequencies before and after correction, and the CPLD counts the vortex shedding signals according to the input PWM signals, and corrects a count value by the lookup table to output a frequency signal reflecting the flow rate. The invention also provides a correction method of the flowmeter. The vortex shedding flowmeter and the correction method have the advantages of low power consumption, reliable performance and good real-time property.

The invention relates to a pulse shaping circuit for shaping electrical pulses driving an optical transmitter, e.g. a lased diode or an LED, and for providing electrical pulses having independently height and width-adjustable peaking at the edges thereof. The pulse shaping circuit of the present invention includes a high-pass RC filter with a differential output for providing transient electrical pulses from an input differential pulse, an adjustable voltage offset generating circuit, a differential amplifier for adjusting the width of the transient electrical pulses in dependence on the adjustable voltage offset, and a variable-gain current-steering amplifier for producing transient pulses with independently adjustable width and height.

The invention discloses a large-amplitude picosecond-level narrow pulse generating circuit, and the circuit comprises a triggering signal, an avalanche transistor Marx cascading pulse generation circuit and a step recovery diode pulse shaping circuit. The avalanche transistor Marx cascading pulse generation circuit receives the triggering signal, and the step recovery diode pulse shaping circuit is connected with the avalanche transistor Marx cascading pulse generation circuit. The avalanche transistor Marx cascading pulse generation circuit enables an energy storage capacitor in an avalanche unit to generate a large-amplitude pulse in a mode of parallel charging and series charging, and then generates a large-amplitude narrow pulse through the step recovery characteristics of a step recovery diode. The front and rear edges are steeper, and the pulse amplitude is within the range from 20V to 30V. The pulse width is lower than 200ps, thereby meeting the demands of pulse drive application of a semiconductor laser.

The present invention relates to a wireless position electronic white board choosing a flat panel display as write plane and relates to an electronic white board using ultrasound infrared position technology. The white board includes an ultrasound infrared signal radiating pen, a receiver and a signal processor. The signal processor includes a microprocessor which is connected to a variable gain amplifier, a pulse shaping circuit and a pulse synthesizing circuit. A peak holding apparatus is connected to the signal processor. The advantages of the invention are that: in the radiating pen, the infrared emission signal is processed by special treatment, the receive processor can filter the influence of the infrared noise; in the receive processing circuit for the ultrasound signal, the adaptive control technology is adopted to resist the decline during the spread process of the ultrasound signal, and the flat panel display can used as write plane.

The body sensation induced potential stimulation system based on vibration includes monolithic microcomputer, pulse shaping circuit, power amplifier circuit, state display, body sensation stimulation generator, and fixer. The monolithic microcomputer calculates to synthesize pulse drive signal with specific frequency and adjustable duty ratio, so that the body sensation stimulation system generates vibration waveform with envelope simulating true touch sensation, vibration sensation and pain sensation to reach the aim of effective body sensation stimulation. The present invention controls the generation of body sensation stimulation signal simulating touch sensation, vibration sensation and pain sensation, and may be used in the application research of body sensation induced potential SEP. The present invention has the features of high integration degree, adjustable strength, high performance / cost ratio, etc. and may be widely applied.

The invention discloses a high-reliability large-power nanosecond narrow pulse generating circuit. The circuit employs a broadband radiofrequency transformer to synchronously feed trigger signals into position between the base electrode and the emitter electrode of each avalanche triode cascaded with a Marx circuit, a protection circuit is arranged between a trigger pulse generating circuit and a trigger pulse shaping circuit, and an isolation circuit is arranged between the trigger pulse shaping circuit and the Marx circuit, wherein the protection circuit is used for protecting the trigger pulse generating circuit, the isolation circuit is used for protecting the trigger pulse shaping circuit, and a high-voltage large-resistance charging resistor is employed in the Marx circuit. Under the condition that large peak power (more than 30kW) and nanosecond narrow pulses (less than 8ns, 10%-10%) are generated, the circuit of the invention solves the problems in the prior art including that the avalanche triode is easy to lose efficacy, and the output large-power nanosecond pulses tend to damage the trigger pulse generating circuit; and the reliability of the circuit is effectively improved.

The invention provides a real-time low speed detection device based on virtual sine waves. The device comprises a pulse encoder outputting Ao, Bo, So and Zo four-set pulse signals, a signal conditioning circuit which is a pulse shaping circuit, a sampling conversion module which is a pulse conversion circuit, and a processor, wherein Ao and Bo pulses are equal cycle and equal duty ratio digital pulses, the So pulses are equal cycle and variable duty ratio pulses, the Zo pulses are the zeroing pulses, four input ends of the sampling conversion module are respectively used for receiving the A, B, S and Z four paths of pulse signals, four output ends of the sampling conversion module are for outputting the frequency multiplication pulses AB, the direction signal R, the zeroing signal Z and asine sampling signal S, and an input end of the processor is connected with the four output ends of the sampling conversion module. The device is advantaged in that real-time and rapid rotating speedcalculation is realized, rotating speed measurement precision is higher, moreover, the whole calculation mode employs an interruption and DSP internal counter, the CPU time is not occupied, and the device is especially suitable for directly-driven wind turbines and real-time control systems for speed closed loop.

The invention relates to an igniter for a motor vehicle, in particular to a digital direct-current igniter for a motorcycle. The digital direct-current igniter comprises a trigger pulse shaping circuit, a negative pulse separation circuit, a positive pulse separation circuit, an ignition advance angle control circuit, a boosting circuit taking a boosting transformer and a switch power tube as cores, and an ignition discharging circuit, and is characterized in that: the ignition advance angle control circuit takes a singlechip processor as a core; and the singlechip processor controls the boosting circuit in a pulse width modulation (PWM) mode. The ignition advance angle control circuit takes a singlechip as a control core, and the ignition advance angle of an engine is subjected to accurate curve control through the quick operation and control functions of the singlechip, so that the engine works in an optimal state; and the PWM control mode is adopted, so that constant high power is output when the boosting transformer is started, and the rise rate of charging voltage of an ignition capacitor is improved.

The invention discloses a real automobile testing system for controlling automotive active anti-rollover. The testing system comprises a real-time platform, sensors, an active steering actuating mechanism, an active hydraulic braking actuating mechanism and an active anti-rollover controller, wherein the active anti-rollover controller comprises a micro controller unit (MCU), a power supply circuit, a clock circuit, a reset circuit, an electrical isolation pulse shaping circuit, six first filtering circuits, six second filtering circuits, a shaping and filtering operational circuit, a first power driving circuit, a second power driving circuit, a third power driving circuit, a fourth power driving circuit and a controller area network (CAN) transmitting and receiving module; the MCU is electrically connected with each circuit; the clock circuit is electrically connected with a pin XTAL32, a pin EXTAL32, a pin EXTAL and a pin XTAL of the MCU; the electrical isolation pulse shaping circuit is electrically connected with a pin MDA11, a pin MDA12, a pin MDA13 and a pin MDA14 of the MCU; and the CAN transmitting and receiving module is electrically connected with a pin A-CNRX0 and a pin A-CNTX0 of the MCU.

Disclosed is a multi-signal-acquisition speed-measurement and reversed-rotation protection and control device including a signal acquisition device and a controller. The signal acquisition device is used for acquiring rotation signals of a rotational mechanical device to be detected. A signal input end of the controller is connected with the signal acquisition device and a control output end is connected with an upper computer or a control device of the rotational mechanical device to be detected. The signal acquisition device includes a signal generating device and / or a signal detection device. The controller includes a single-chip microcomputer, a signal acquisition circuit, a pulse shaping circuit, a phase-inverting circuit, a DA conversion module, a relay output circuit, an analog-signal output circuit, a communication module, a remote-reset and bypass input circuit, a button module, a storage module, a display module and a power-supply module. The multi-signal-acquisition speed-measurement and reversed-rotation protection and control device realizes positive and inversed rotation detection and protection of the rotational mechanical device to be detected and has the characteristics of being large in rotation-speed measurement range, wide in voltage input and provided with current circuit protection for output and the like so that the device is not only powerful in function, but also high in precision, anti-interference and adaptability.

The invention provides a front measurement circuit for measuring charge (current) signal and converting the signal into frequency output. A charge frequency converter is mainly characterized in that a current signal input end P1 is connected with an input end of an integration circuit (1) through a resistance R2; an output end of the integration circuit (1) is connected with an input end of a narrow pulse formation circuit (3) through a range discriminating circuit (2); an input end 1 of the narrow pulse formation circuit (3) is respectively connected with an input end of a time-delay circuit (4), an input end of an output pulse shaping circuit (6) and a control end of a first release switch (8); an output end of the time-delay circuit (4) is connected with a release branch through range control and a coupling circuit (5); an input end 2 of the narrow pulse formation circuit (3) is connected with a control end of a second release switch (9); and an output end of the output pulse shaping circuit (6) is connected with a frequency output stage circuit (7). The invention provides a measurement circuit with simple structure and reliable performance for reading signal of beam intensity detector.

The invention relates to a pulse shaping circuit for shaping electrical pulses driving an optical transmitter, e.g. a lased diode or an LED, and for providing electrical pulses having independently height and width-adjustable peaking at the edges thereof. The pulse shaping circuit of the present invention includes a high-pass RC filter with a differential output for providing transient electrical pulses from an input differential pulse, an adjustable voltage offset generating circuit, a differential amplifier for adjusting the width of the transient electrical pulses in dependence on the adjustable voltage offset, and a variable-gain current-steering amplifier for producing transient pulses with independently adjustable width and height.

The invention relates to a rotation torque sensor supplying power by the adoption of a dynamic transformer in a coupling mode. The rotation torque sensor supplying the power by the adoption of the dynamic transformer in the coupling mode comprises an elastic rotating shaft. A strain gage is adhered to the shaft body of the elastic rotating shaft; both a signal conditioning and infrared photoelectric emission circuit board and a secondary coil of the dynamic transformer are fixedly arranged on the shaft body of the elastic rotating shaft; both an F / V and V / I conversion circuit board and a primary coil of the dynamic transformer are fixedly arranged on the shell body of a shell; the primary coil of the dynamic transformer is coupled to the secondary coil of the dynamic transformer; two ends of the shell are respectively and fixedly provided with an end cover; the elastic rotating shaft is installed on end covers through bearings; both a primary oscillation drive circuit board of the dynamic transformer and an infrared receiving and pulse shaping circuit board are fixedly arranged on the end covers. The rotation torque sensor supplying the power by the adoption of the dynamic transformer in the coupling mode effectively solves the problems that a purely-photoelectric-type rotation torque sensor supplies power through photocells so as to cause large temperature rise, and meanwhile effectively solves the anti-interference problem of a purely-magneto-electricity-type rotation torque sensor, can output a plurality of types of signals such as frequency signals, current signals and voltage signals, and enlarges application ranges.

The invention discloses a linear-array real-time imaging pulse laser radar device. The device comprises 2 optical emission antennas, 2 N-element laser diode arrays, a narrow pulse laser driving circuit, a sequential control circuit, an optical receiving antenna, a 2N+1 element APD detector array, a bias high-voltage automatic control circuit, 2N+1 paths of parallel preposition amplification circuits, 2N+1 paths of parallel pulse shaping circuits, 2N paths of binary signal parallel processing circuits and 2N paths of parallel high-precision time-digital conversion circuits. In the invention, a laser diode array is combined with field splicing illumination, a linear array APD detector receiving, constant false alarm automatic gain control and real-time parallel signal pretreatment so that large field and high spatial resolution imaging can be realized. Advantages of miniaturization, low power consumption and the like are possessed. Under a low signal to noise ratio condition, high accurate measurement and real-time range finding can be performed. And the device can be used in fields of low air-to-ground three-dimensional imaging, vehicle-mounted three-dimensional scene acquisition and the like.