168 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 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 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 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 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 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.

The present application relates to photoelectric displacement precision measurement technical field, especially to a kind of spaceborne incremental photoelectric encoder signal processing method, by microprocessor executes following steps: S1, the state of first square wave pulse signal is judged;S2, when detecting the falling edge of second square wave pulse signal, and the state of first square wave pulse signal is high level at this time, rough code count is added one;When detecting the falling edge, and the state of first square wave pulse signal is low level, rough code count is reduced one;S3, to the subdivision of fine code signal is carried out, and with rough code count is connected to obtain binary angular displacement;S4, to upper system is sent;Fully utilize the characteristics of interference generated by shaping circuit due to no positive feedback composition hysteresis comparator, without increasing positive feedback circuit, change rough code count method, can reduce the size and cost of hardware circuit;While saving the debugging positive feedback circuit process, reduce the workload of hardware debugging personnel, improve overall circuit debugging efficiency.

The utility model belongs to the technical field of elevator power supplies, and particularly discloses a starting current surge suppression failure detection circuit for an elevator power supply, which comprises a negative temperature resistor N1, a direct current constant current source A1, a direct current constant voltage source V1 and a hysteresis comparator U1, the negative temperature resistor N1 is arranged close to a current limiting circuit, the output end of the direct current constant current source A1 is electrically connected with one end of the negative temperature resistor N1, and the output end of the direct current constant current source V1 is electrically connected with the other end of the negative temperature resistor N1. The in-phase input end of the hysteresis comparator U1 is electrically connected to a line between the direct current constant current source A1 and the negative temperature resistor N1, and the inverted input end of the hysteresis comparator U1 is electrically connected with the direct current constant voltage source V1. According to the utility model, the failure detection circuit is designed, under the condition that a basic startup current surge suppression function is satisfied, a startup current surge suppression failure self-detection function is added, and when an electronic switch of the startup current surge suppression circuit fails, timely protective shutdown can be realized, and further expansion of faults is avoided.

This disclosure provides an enable control circuit for a low-dropout linear regulator, comprising a voltage conversion circuit and a hysteresis comparator circuit. The voltage conversion circuit generates an internal enable signal based on an external enable signal and a power supply voltage. When the voltage value of the external enable signal is lower than the power supply voltage, the voltage value of the internal enable signal follows the change of the external enable signal. When the voltage value of the external enable signal is equal to or higher than the power supply voltage, the voltage value of the internal enable signal is equal to the power supply voltage, such that the quiescent current of the hysteresis comparator circuit is zero. The hysteresis comparator circuit is powered by the power supply voltage. The hysteresis comparator circuit generates an enable control signal based on the internal enable signal. When the voltage value of the internal enable signal rises to a first threshold, the enable control signal flips to a first level. When the voltage value of the internal enable signal falls to a second threshold, the enable control signal flips to a second level. The power supply voltage is higher than the first threshold. The first threshold is higher than the second threshold.

This invention discloses a variable-step automatic gain control method based on an adaptive window, applicable to signal automatic gain control in data acquisition systems. The method preprocesses the input signal and samples it using an ADC to obtain a digital signal, which is then fed into an FPGA. A zero-crossing detection method based on a hysteresis comparator is used to estimate the signal frequency, and the window length is calculated based on this adaptive amplitude matching. The average signal amplitude within the window is then calculated and compared with a preset automatic gain threshold range. The gain step value is dynamically matched and updated to the variable gain amplifier to complete closed-loop control. Finally, the gain value is used to perform an amplitude inverse calculation to restore the signal. This invention improves the detection accuracy and dynamic response speed of the system over a wide bandwidth and dynamic range, eliminates the hardware resource consumption of floating-point division operations, and accurately outputs a distortion-free original proportional signal stream.

The application belongs to the field of rail-to-rail hysteresis comparators, and provides a rail-to-rail hysteresis comparison circuit and electronic equipment. The rail-to-rail hysteresis comparison circuit comprises a rail-to-rail input module, a clamping current comparison module and a hysteresis buffer module. The rail-to-rail input module is used for receiving an input signal and a bias power supply signal, and generating a single-ended signal according to the input signal and the bias power supply signal. The clamping current comparison module is connected to the rail-to-rail input module, used for receiving the single-ended signal and the bias power supply signal, and performing clamping processing on the voltage of the single-ended signal to generate a clamping current signal. The hysteresis buffer module is connected to the clamping current comparison module, used for receiving the clamping current signal, and performing hysteresis buffer processing on the clamping current signal to generate a driving signal. The rail-to-rail input module can normally work when the common-mode range of the input signal is wide, and the clamping current comparison module improves the working speed of the rail-to-rail hysteresis comparison circuit.

This invention relates to the field of intelligent power module technology, and particularly to a temperature protection circuit based on a hysteresis comparator and an intelligent power module incorporating the same. The circuit includes: a reference current source module connected to a temperature detection circuit, which is connected to the positive input terminal of the hysteresis comparator via a resistor R1; one end of resistor R1 and the positive input terminal of the hysteresis comparator are connected to one end of resistor Rf, and the other end of resistor Rf is connected to the positive output terminal of the hysteresis comparator; the reference current source module is connected to the negative input terminal of the hysteresis comparator via a resistor R; the temperature detection circuit detects the real-time temperature of the high-voltage integrated circuit and outputs a corresponding voltage signal. When the temperature exceeds or falls below a set threshold voltage, the hysteresis comparator internally controls the high-voltage integrated circuit to disconnect or connect to the power supply. This invention effectively improves the anti-interference capability of the temperature protection circuit, protects the integrated intelligent power module from damage due to high temperatures, and thus improves the reliability and market competitiveness of the intelligent power module.