208 results about "Hysteresis comparator" patented technology

The invention discloses an automatic identification and expansion communication method based on an RS485 interface, and relates to the technical field of industrial automation communication. The problems that an existing RS485 interface is complex in configuration, poor in protocol compatibility and high in data transmission delay are solved. According to the scheme, the terminal matched resistance and the bias current are adjusted in real time by dynamically measuring the bus equivalent distributed capacitance value, and signal attenuation caused by the capacitance effect is inhibited; a silicon controlled rectifier trigger type charge discharge mechanism is adopted to force bus residual charge to return to zero quickly, and an idle state is accurately judged in combination with a hysteresis comparator; dynamically compensating signal edge distortion and calibrating a sampling window time sequence based on a pre-emphasis filtering and Kalman filtering algorithm; multi-node stable communication is realized through capacitance value driven conflict detection threshold adaptive adjustment and a Poisson back-off model; according to the invention, the real-time performance, the anti-interference capability and the multi-node expansion reliability of RS485 communication in a complex industrial scene are obviously improved, and the debugging and maintenance cost of the system is reduced at the same time.

The invention provides a radio frequency front end module. The circuit comprises a first matching circuit, a first-stage power amplification circuit, a coupler, a first radio frequency switch, a radio frequency main path, an attenuation path, a second radio frequency switch, a second matching circuit, a second-stage power amplification circuit, a third matching circuit, a power detection circuit, a low-pass filter, a first operational amplifier and a hysteresis comparator. The hysteresis comparator is used for controlling the input end of the first radio frequency switch to be communicated with the first output end of the first radio frequency switch or the second output end of the first radio frequency switch; and meanwhile, the control circuit is used for controlling the first input end of the second radio frequency switch or the second input end of the second radio frequency switch to be communicated with the output end of the second radio frequency switch. According to the radio frequency front-end module, on the premise that the power amplification circuit is not damaged, normal output of the radio frequency signal can be ensured, and meanwhile the situation that a post-stage output signal is distorted due to reduction of the bias voltage is avoided.

The invention belongs to the technical field of inverters, and provides a three-level quasi-fixed-frequency hysteresis comparison inverter and a control method thereof, and the inverter comprises an inverter bridge, a filter inductor and a current transformer which are connected in sequence. Wherein the inverter bridge is arranged between the upper direct-current bus and the lower direct-current bus and adopts a three-phase bridge type structure, each phase bridge type structure at least comprises four power switch tubes and two diodes, a first voltage stabilizing capacitor is arranged between the upper direct-current bus and the midpoint of the inverter bridge, and a second voltage stabilizing capacitor is arranged between the lower direct-current bus and the midpoint of the inverter bridge. A second voltage stabilizing capacitor is arranged between the lower direct current bus and the midpoint of the inverter bridge; a driving unit, a driving control unit, a phase change ring width hysteresis comparator and a ring width calculator which correspond to each phase of bridge type structure are arranged between the inverter bridge and the current transformer, and an inverter output voltage detection unit is arranged between the ring width calculator and the filter inductor. And an inverter output current detection unit is arranged between the phase change ring width hysteresis comparator and the current transformer.

The invention relates to the technical field of digital-analog hybrid integrated circuit design, and particularly provides a FlexRay bus receiver with low noise and wide common-mode input range, which is characterized in that a common-mode voltage division module receives a differential signal output by a bus and carries out voltage division, and then a pre-amplification module carries out amplitude limiting amplification on the signal after voltage division; the hysteresis comparator module generates threshold hysteresis and generates a logic level signal based on the signal after amplitude limiting amplification, and the digital logic receiving module receives and processes the logic level signal, generates a receiving data signal and transmits the receiving data signal to an external controller. According to the invention, the differential signal pair received on the FlexRay bus is subjected to voltage division and amplitude limiting amplification, so that a wider common-mode input range is provided, the problem of large ground potential difference is solved, and the capability of suppressing common-mode noise and the communication stability are improved. Meanwhile, the hysteresis comparator module suppresses noise false triggering by generating threshold hysteresis, and the anti-noise capability of the receiver is remarkably improved.

The invention relates to the technical field of electronic display, and discloses a liquid crystal display screen display control system based on multi-mode driving. The system comprises a content feature analysis module, a mode decision engine, a driving parameter library and a liquid crystal driving signal generation module. Multi-dimensional feature vectors are extracted through the content feature analysis module, a nonlinear decision mechanism combining fuzzy reasoning and hysteresis control is adopted, and single fixed threshold judgment in the prior art is thoroughly abandoned. The system can accurately capture dynamic characteristics of display content, effectively avoids the problem of mode oscillation in a threshold critical region, and realizes smooth and stable switching of driving modes. According to the invention, the hysteresis comparator and the continuous frame decision logic are introduced, so that the anti-interference capability and decision stability of the system are remarkably enhanced. The system does not trigger mode switching due to instantaneous noise or slight jitter of a single-frame image, so that the continuity of display experience is ensured, and extra power consumption caused by frequent switching is reduced.

The embodiment of the invention provides a tuning voltage calibration device, a phase-locked loop and a tuning voltage calibration method, the device comprises a voltage comparison module and a calibration module, the output end of the voltage comparison module is connected with the input end of the calibration module, the voltage comparison module is connected with the phase-locked loop, and the phase-locked loop is connected with the calibration module. The comparator is used for comparing a reference voltage with a preset value with a tuning voltage in a phase-locked loop through a hysteresis comparator to generate an error signal; and the calibration module is used for determining the calibration direction of the tuning voltage according to the error signal, calibrating the tuning voltage based on the calibration direction, and stopping calibration of the tuning voltage under the condition that the error signal is continuously overturned. According to the embodiment of the invention, one hysteresis comparator is adopted, the implementation mode is simpler, the controllable range of the tuning voltage is enlarged, calibration is stopped when the tuning voltage is stable, power consumption generated by continuous calibration is avoided, and the problems that the tuning voltage range of double comparators is limited and continuous power consumption overhead exists in the prior art can be solved.

The invention relates to the technical field of intelligent power modules, in particular to a temperature protection circuit based on a hysteresis comparator and an intelligent power module with the same, and the circuit is characterized in that a reference current source module is connected with a temperature detection circuit, and the temperature detection circuit is connected with the positive input end of the hysteresis comparator through a resistor R1; one end of the resistor R1 and the positive input end of the hysteresis comparator are connected with one end of the resistor Rf, and the other end of the resistor Rf is connected with the positive output end of the hysteresis comparator; the reference current source module is connected with the negative input end of the hysteresis comparator through a resistor R; the temperature detection circuit detects the real-time temperature of the high-voltage integrated circuit and outputs a corresponding voltage signal, and when the real-time temperature exceeds or is lower than a set threshold voltage, the hysteresis comparator controls the high-voltage integrated circuit to be disconnected or connected with the power supply through internal connection or disconnection. According to the invention, the anti-interference capability of the temperature protection circuit can be effectively improved, the integrated intelligent power module is protected from being damaged by high temperature, and the reliability and market competitiveness of the intelligent power module are further improved.

The invention belongs to the technical field of new energy power, and particularly relates to an unmanned aerial vehicle hydrogen fuel cell hybrid power system and a control method thereof. The system comprises a fuel cell stack which is used for providing a reference power supply and has adjustable power output; the super capacitor bank is used for outputting peak current when transient high power is needed, and has the characteristics of high power density and quick response; the lithium iron phosphate battery pack is used for providing an emergency power supply when the fuel cell fails; the dynamic bus controller integrates the voltage hysteresis comparator and the CAN bus communication module and is used for controlling energy output of the fuel cell stack, the super capacitor bank and the lithium iron phosphate battery pack; the LSTM neural network prediction module is used for predicting a future power demand according to the flight attitude, the meteorological data and a historical load curve and triggering power climbing of the fuel cell in advance; and the Buck-Boost circuit is used for the fuel cell to directly charge the super capacitor bank, so that the dynamic response speed and the system stability of the unmanned aerial vehicle in a violent maneuvering state are remarkably improved.

The invention relates to the field of motor driving control, in particular to a motor driving circuit with a hysteresis window dynamically matched rotating speed. Comprising a Hall voltage output module, an adjustable hysteresis comparator module, a logic control module, a three-phase non-overlapping clock module, a voltage stabilization and reference voltage output module, a frequency multiplication module, a frequency voltage conversion module, an H-bridge driving signal output module, a comparison module, an ROM module and a DAC module. The overturning threshold voltage output by the logic control module corresponds to the rotating speed of the motor, a hysteresis window can be dynamically adjusted according to the rotating speed, the hysteresis window is relatively large at the low rotating speed, and the phenomenon that the motor shakes due to the influence of noise and the like when the motor is at the low speed and frequent reversing of a coil magnetic field is reduced. And a relatively small hysteresis window is adaptively switched at a high rotating speed, so that the phase delay during coil commutation can be reduced, a coil commutation signal is synchronous with a rotor position, and the stability of the motor during high-speed operation is improved.

The invention belongs to the technical field of integrated circuits, and particularly relates to a PLL (Phase Locked Loop) adaptive trimming circuit. Comprising a sampling analog-to-digital conversion module, the sampling analog-to-digital conversion module comprises three sampling analog-to-digital conversion units, the in-phase input ends of the three sampling analog-to-digital conversion units are connected with voltage division nodes N1-N3 on a voltage division network respectively, the inverted input ends of the three sampling analog-to-digital conversion units are connected with control voltage VCTRL, and the output ends of the three sampling analog-to-digital conversion units output a control signal B, a control signal E and a control signal A respectively; wherein each sampling analog-to-digital conversion unit is composed of a hysteresis comparator COMP1, a comparator COMP2 and a phase inverter INV1 which are sequentially connected in series; the digital trimming state machine is composed of a first gate circuit, an N-stage locking loop and a second gate circuit which are sequentially connected in series; the problem that the working characteristic of the PLL is obviously reduced after the PLL is influenced by the PVT is solved.

The invention provides a hysteresis comparator, and belongs to the technical field of electronics. The hysteresis comparator comprises an open-loop operational amplifier circuit and a positive feedback circuit; the positive feedback circuit comprises a switching tube device and a current source, the switching tube device is electrically connected with the open-loop operational amplifier circuit and the current source, and the positive feedback circuit is used for forming an internal positive feedback path with the open-loop operational amplifier circuit when the switching tube device is switched on and adjusting hysteresis voltage through the current source. According to the invention, the hysteresis voltage can be regulated through the current source, so that the stability of the hysteresis voltage is ensured.

The invention relates to the technical field of illumination control, in particular to a digital analog temperature control dimming method, circuit and system and a storage medium. Comprising the following steps: acquiring an environment temperature signal in real time through a temperature sensing NTC resistor, and converting the temperature signal into a resistance value inversely proportional to the temperature; the NTC resistance value is converted into a voltage signal through a voltage dividing network, the voltage signal is transmitted to a reference voltage control point A, and the voltage of the point A changes along with changes of the NTC resistance value. The high-precision NTC resistor is used for collecting environment temperature signals, the environment temperature signals are converted into voltage signals through the voltage dividing network, the hysteresis comparator and the soft start / turn-off circuit are combined, the resolution ratio and stability of the temperature signals are effectively improved, and accurate control over LED brightness is ensured.

The embodiment of the invention provides a hysteresis comparator circuit and a hysteresis comparator, the hysteresis comparator circuit comprises an open-loop operational amplifier circuit, the open-loop operational amplifier circuit is used for receiving a reference input and a comparison input, and determining a comparison output according to the reference input and the comparison input; the current feedback control circuit is connected with the open-loop operational amplifier circuit and used for controlling hysteresis current to be input to the open-loop operational amplifier circuit according to the comparison output, and the open-loop operational amplifier circuit feeds back and adjusts hysteresis voltage under the action of the hysteresis current; the bias voltage providing circuit is connected with the open-loop operational amplifier circuit and used for providing bias voltage for the open-loop operational amplifier circuit, and the bias voltage is used for controlling on-off of the open-loop operational amplifier circuit. The hysteresis comparator solves the technical problems that the hysteresis amount in the hysteresis comparator in the prior art is influenced by the power supply voltage and the hysteresis window is asymmetric.

According to the clock signal detection circuit disclosed by the invention, the functions of level shifting and voltage extraction of clock differential signals are integrated into the same level of circuit, so that compared with a two-level scheme that the clock differential signals are shifted first and then the peak values of the clock differential signals are sampled in an existing structure, the transmission delay of the signals is reduced; and false triggering caused by noise is avoided by adopting the hysteresis comparison circuit, so that the signal detection circuit provided by the embodiment of the invention improves the detection speed while ensuring the detection precision. In addition, the logic circuit adopts an RS trigger, so that the stability of a hysteresis interval is improved, and the transmission delay of the signal is further reduced.

The invention discloses an electrical energy consumption and mechanical load coordinated instrument dynamic calibration system, and relates to the technical field of instrument calibration, the system comprises a diagnosis module for receiving original data streams of an electrical side and a mechanical side, and identifying segments to be optimized by calculating a symbol consistency rate and a zero cross alignment error; the robust symbol division module performs symbol state judgment by using a dynamic dead zone and a double-domain hysteresis comparator, and outputs smooth symbol segments and a switching delay table in combination with a finite state machine; the signed channel reconstruction module executes phase micro-shift and amplitude reconstruction based on the switching delay table, and outputs the signed channel after electrical side optimization; the write-back and closed-loop module obtains positive and negative power calibration parameters through bipolar bucket separation and robust linear regression, and writes back to the instrument after event-level energy closed verification to form closed-loop verification. According to the method, the instrument calibration precision and reliability under the dynamic working condition are effectively improved.

The present invention belongs to the technical field of plasma sources, and provides a fuzzy hysteresis control method and circuit for a high-power and high-stability remote plasma source. When the reaction chamber is successfully ignited, the plasma source system is controlled to operate at a constant power output with a fixed frequency and variable duty cycle, including: respectively obtaining error control variables e and ec according to the sampled current value and duty cycle, and the predicted current value and duty cycle; using the error control variables e and ec as the input values of a fuzzy controller to obtain the actual control quantity hr output by the fuzzy controller; obtaining the compensation variables of current and duty cycle based on the error control variables e and ec; using the actual control quantity hr as the hysteresis width value of a hysteresis comparator, and compensating the current and duty cycle at the k-th moment with the output compensation variables according to a preset rule. The method provided by the present invention can ensure a relatively wide power window, improve the working stability of the remote plasma source, and enhance the uniformity of the semiconductor manufacturing process.

This application relates to an infrared detection circuit, method, apparatus, and device. When an infrared signal is received by an infrared receiver, power is supplied to ground through the infrared receiver and a sampling resistor. A corresponding voltage signal is detected at the sampling resistor and coupled to an inverting integrator circuit for integration, yielding a signal of the magnitude of a first voltage signal. This signal is then transmitted to a hysteresis comparator circuit for comparison, ultimately outputting a square wave signal of the magnitude of a second voltage signal to the processor, which identifies the signal. The processor determines the frequency of the output square wave signal based on the first and second voltage signals and then determines the infrared signal intensity based on the frequency, thus achieving infrared signal intensity detection. During operation, this scheme can convert infrared signals of different intensities into square wave signals of corresponding frequencies, thereby enabling the processor to detect infrared signal intensity based on the frequency of the received square wave signal.

The application discloses a kind of pneumatic-hydraulic hybrid wave energy device energy conversion systems, including nozzle, impulse turbine, torque output shaft, shaft coupling, rotational speed sensor, variable displacement pump, energy accumulator, manual reversing valve, first electromagnetic ball valve, second electromagnetic ball valve, hydraulic motor, permanent magnet generator, PID control module, hydraulic oil tank, oil pressure sensor, first hysteresis comparator, second hysteresis comparator, air pressure sensor and overflow valve.The application realizes an innovative pneumatic-hydraulic energy conversion mode by combining air turbine and hydraulic conversion system.

Embodiments of the present disclosure relate to pulse width modulation generated by a Σ-Δ loop. A Σ-Δ (SD) pulse width modulation (PWM) loop includes a loop filter that implements a linear transfer function to generate a loop filter signal, where the loop filter is configured to receive an input signal and a first feedback signal, and generate the loop filter signal based on the input signal, the first feedback signal, and the linear transfer function; and a hysteresis comparator coupled to an output of the loop filter, the hysteresis comparator being configured to receive the loop filter signal and generate a Σ-Δ PWM signal based on the loop filter signal, where the first feedback signal is derived from the Σ-Δ PWM signal.

The utility model relates to an alarm controller compatible with a natural gas sensing network. The alarm controller comprises a control module, a sensor interface array, an alarm execution module and a compatible adaptation module. Wherein at least one sensor interface in the sensor interface array is connected with the control module through the compatible adaptation module, and the output of the control module is connected with the alarm execution module; the compatible adaptation module comprises a power supply adaptation unit and at least two paths of level conversion units, the power supply adaptation unit comprises a plurality of different voltage power supply units or adjustable voltage power supply units, and each level conversion unit comprises a source electrode following circuit and an in-phase hysteresis comparator; and the outputs of the source follower circuits in different level conversion units are respectively connected to the input of the control module through switches. According to the utility model, the compatibility of the natural gas sensing network is improved, and field application and maintenance are facilitated.

The application discloses a kind of based on SM2 algorithm and SM4 algorithm's password processing method and system, belong to computer information security technical field, comprising: the enhanced task control block including service index number and data amount is constructed;Based on historical performance data calculation processing coefficient, utilize double threshold hysteresis comparator decision serial or parallel mode, avoid mode frequent switching;Parallel mode is through load balancing weight function for subtask allocation IP core;Hardware synchronization control unit maintains three index tables being processing, blocking and having been processed, realizes the automatic blocking and wake-up of associated job package, and with service index number as address accesses key and intermediate state;Adopt interrupt aggregation and double buffering batch processing result;Based on sliding window adaptive calibration double threshold and dynamically adjusting weight coefficient.The application effectively reduces interrupt overhead, eliminates scheduling ping-pong effect, realizes hardware level job synchronization, improves load balancing and image encryption structure fidelity.

The utility model relates to a gateway self-adaptive to various analog communication terminals, and relates to the field of gateways. In the self-adaptive gain amplifier, the output end of a programmable gain amplifier is connected with a peak value detection unit for detecting the peak value of an amplified signal, the output end of the peak value detection unit is connected with one input of a hysteresis comparator, and the other input of the hysteresis comparator is connected with a reference voltage source; the output of the hysteresis comparator is electrically connected with an adaptive gain amplifier controller, the adaptive gain amplifier controller is connected with an adjustable bias voltage source and a control pin of a programmable gain amplifier, and the output voltage of the adjustable bias voltage source acts on the input of the programmable gain amplifier; the output end of the programmable gain amplifier is connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the gateway processor. According to the invention, the method is adaptive to any analog signal communication terminal, and adaptive acquisition of analog signals meeting requirements is realized.

This invention discloses an over-temperature protection circuit for power supply ICs, belonging to the field of integrated circuit design. It includes a reference current source module, a PTAT current source module, a temperature decision module, a temperature sensing module, and a hysteresis comparator module. This circuit employs a temperature-segmented triggering mode and hysteresis comparator technology. While ensuring a wide operating temperature range, it significantly reduces the high power consumption caused by the indiscriminate operation of traditional over-temperature protection across the entire temperature range. Furthermore, it effectively avoids false triggering faults near the over-temperature protection point caused by process fluctuations or noise, and solves the problem of repeated switching of power transistors due to external disturbances. Therefore, it is suitable for use in power chips requiring integrated over-temperature protection. The over-temperature protection circuit of this invention has the advantages of simple structure, low production cost, and small area, and combines low power consumption with high reliability, thus improving the lifespan and stability of power supply ICs.

Disclosed is an integrated transceiver circuit, which can be applied to signal transceiving between an external control device and an external diagnostic device. A communication channel between each GPIO port of the external control device and any OBD terminal is constructed by using the transmitting matrix and receiving matrix, meanwhile, a drive circuit is arranged. On the one hand, signals from external control devices are converted into an output drive signal with matchable voltage, current and load through the drive circuit and differential impedance control unit, so that signals from GPIO ports can be sent according to the voltage, current and load requirements of various communication protocols. On the other hand, signals from the OBD terminal is received according to the voltage requirements of the communication protocol through the hysteresis comparator in the drive circuit.

The application provides a voltage holding device and an electronic device using the same. The voltage holding device uses a hysteresis voltage of a hysteresis comparator to update the charge of a capacitor efficiently and pursue lower power consumption. On the other hand, because the advanced voltage holding circuit pursues lower power consumption, the refresh time must be designed to be longer, which results in the inability to perform a large amount of yield tests. However, the technical solution provided by the application can cooperate with related application circuits to greatly shorten the test time, increase the testability and reliability of the voltage holding device.

Embodiments of the present disclosure provide a voltage selection circuit. The voltage selection circuit includes an input comparison circuit, first and second hysteresis comparators, first and second output control circuits. The input comparison circuit compares magnitudes of first and second input voltages to generate first and second indication signals. The first hysteresis comparator generates third and fourth indication signals according to the first indication signal. A supply voltage of the first hysteresis comparator is equal to the first input voltage. The second hysteresis comparator generates fifth and sixth indication signals according to the second indication signal. A supply voltage of the second hysteresis comparator is equal to the second input voltage. The first output control circuit generates an output voltage according to the first input voltage when voltages of the third and sixth indication signals are both less than the first input voltage. The second output control circuit generates the output voltage according to the second input voltage when voltages of the fourth and fifth indication signals are both less than the second input voltage.

The invention discloses an electrosurgical operating instrument and an electrosurgical system, and belongs to the field of medical instruments. An electrosurgical instrument comprising an end effector assembly; the handle assembly operably provides driving force and electrosurgical energy for the end execution assembly, the handle assembly comprises a holding main body and a closing trigger pivotally connected to the holding main body, and a first switch and a second switch which can be triggered respectively are arranged in the handle assembly; the first switch and the second switch are connected with the controller through the hysteresis comparator; the controller controls the excitation electrosurgical energy by judging the output signal state of the hysteresis comparison circuit. According to the invention, the problem of energy interruption caused by unexpected operation in the existing bipolar electrotome design is solved.

The invention discloses a digital quantum voltmeter and a voltage measurement method, and relates to the field of quantum electricity measurement, and the digital quantum voltmeter comprises a quantum voltage reference device, an integrator, a hysteresis comparator and a controller. The controller is connected with the output end of the hysteresis comparator and the input end of the quantum voltage reference device, and the controller is used for controlling the polarity of the output voltage of the quantum voltage reference device according to the polarity of the output voltage of the hysteresis comparator; the input end of the integrator is connected with the output end of the detected voltage and the output end of the quantum voltage reference device. And the output end of the integrator is connected with the input end of the hysteresis comparator. According to the invention, a zero traceability chain can be realized, so that the voltage measurement accuracy is improved.

The application belongs to the technical field of power electronics and new energy control, and particularly relates to a hybrid power supply system power control method for a three-port converter. The method comprises the following steps: S1, collecting a state of charge signal SOC of the battery unit in real time, and inputting the state of charge signal SOC into a low-power hysteresis comparator and a high-power hysteresis comparator respectively; S2, dynamically adjusting a battery charging power reference value and a bus voltage reference correction term according to a low-power interval identifier, a high-power interval identifier and a normal power interval identifier, and injecting the adjusted battery charging power reference value and the bus voltage reference correction term into a control loop in real time; and S3, constructing a first sub-control loop, a second sub-control loop and a third sub-control loop running in parallel in the control loop.

This disclosure relates to glitch suppression for FSK demodulation. According to an embodiment, a glitch suppression circuit includes a first-stage averaging circuit with programmable length, a second-stage averaging circuit, and a hysteresis comparator. The first stage uses a FIFO buffer to implement recursive shifting and averaging to process a binary input signal. The second stage provides moving average filtering. The hysteresis comparator uses a programmable threshold set based on the peak signal value to generate a clean output signal. This circuit removes glitches from the input signal of the frequency shift keying (FSK) demodulator while maintaining signal integrity at high bit rates. The programmable parameters allow for optimization based on desired glitch characteristics and system requirements.