77 results about "Schmitt trigger" patented technology

The invention discloses an MEMS resonator low ripple error temperature measurement system based on voltage feedback compensation, and the system comprises a trans-impedance amplifier, an analog-to-digital converter, a frequency detection module, a PI controller, a variable gain amplifier, a Schmitt trigger, a first digital-to-analog converter, a biasing circuit, mode switches S1 and S2, and a voltage feedback compensation loop. The compensation loop comprises an amplitude detection module, a lookup table, a second digital-to-analog converter and an adder; the amplitude detection module receives the digital signal from the analog-to-digital converter and outputs a vibration amplitude signal in real time; the lookup table receives the vibration amplitude signal, inquires and outputs a corresponding digital compensation voltage, and converts the digital compensation voltage into an analog voltage through a second digital-to-analog converter; the adder adds the analog voltage and a fixed bias voltage to generate a dynamic bias voltage and applies the dynamic bias voltage to a drive electrode of the MEMS resonator. According to the system, an amplitude-driving end bias voltage feedback compensation loop is introduced, so that the periodic ripples of the resonant frequency are effectively suppressed.

This invention discloses a self-locking circuit and protection system for emergency communication equipment, relating to the field of emergency communication. The self-locking circuit includes: a Schmitt trigger, an RS latch, a magnetic latching relay, a first driver transistor, a second driver transistor, an inverter, and a reset switch. The Schmitt trigger's input receives an abnormal signal and a reference voltage, and its output is connected to the RS latch's set terminal. The RS latch's output is connected to the base of the first driver transistor. The collector of the first driver transistor is connected to the magnetic latching relay's set terminal, and its emitter is grounded. The reset switch's first terminal is grounded, and its second terminal is connected to the RS latch's reset terminal via the inverter. The RS latch's reset terminal is connected to the base of the second driver transistor. The second driver transistor's collector is connected to the magnetic latching relay's reset terminal, and its emitter is grounded. The magnetic latching relay's output is connected to the emergency communication equipment. By implementing this invention, the problem of repeated device restarts in existing software-based communication management is solved, improving the equipment's operational stability.

A device including an inverter circuit, a hysteresis control circuit, and a high-side input level shifter. The inverter circuit having an output and including at least two series connected PMOS transistors connected, at the output, in series to at least two series connected NMOS transistors. The hysteresis control circuit coupled to the output to provide feedback to the at least two series connected PMOS transistors and to the at least two series connected NMOS transistors. The high-side input level shifter connected to gates of the at least two PMOS transistors and configured to shift a low level of an input signal to a higher level and provide the higher level to one or more of the gates of the at least two PMOS transistors.

A self-filtering monostable PUF circuit based on hysteresis effect is provided. The self-filtering monostable PUF circuit includes a PUF unit array formed by n×m PUF units distributed in n rows and m columns, wherein n and m are integers greater than or equal to 1. By adding a filter unit based on a Schmitt trigger, the self-filtering monostable PUF circuit utilizes the hysteresis effect of the Schmitt trigger to efficiently self-filter the PUF units with unstable outputs to improve the overall stability of the PUF circuit. The advantage of high stability is achieved.

The invention provides a rising edge trigger and a low noise amplifier. The rising edge trigger comprises a first phase inverter, a second phase inverter, a capacitor, a Schmitt trigger, a phase inverter circuit, an NAND gate and a third phase inverter, the input end of the first phase inverter is used for accessing an enable signal for controlling the low-noise amplifier to work; the power supply end of the second phase inverter is used for being connected to the current outflow end of a current source for providing reference current for the low-noise amplifier; the first input end of the NAND gate is connected to the output end of the inverter circuit, and the second input end of the NAND gate is connected to the output end of the first inverter; the input end of the third phase inverter is connected to the output end of the NAND gate, and the output end of the third phase inverter is used for outputting a delay control signal. According to the rising edge trigger, the area of the capacitor can be reduced according to the magnitude of the current of the accessed current source for providing the reference current for the low-noise amplifier, so that the occupied area of the rising edge trigger is reduced.

The utility model relates to the technical field of H-bridge drive circuits, and discloses a high-reliability H-bridge dead-zone generation circuit, which comprises two AND gates for preventing two MOS (Metal Oxide Semiconductor) transistors on the same side of the circuit from being switched on at the same time; the exclusive-OR gate can distinguish input signal directions and output response control signals; the Schmitt trigger is used for converting the curve waveform into a PWM (Pulse Width Modulation) square wave signal and inhibiting noise and interference in an input signal; the RC time delay circuit is connected with the Schmitt trigger and is used for realizing signal delay; the two AND gates comprise a first AND gate and a second AND gate; the first AND gate and the second AND gate are electrically connected with the exclusive-OR gate, and the exclusive-OR gate and the first AND gate are electrically connected with the Schmitt trigger; according to the utility model, the formation of dead zone time is realized through RC time delay and Schmidt characteristics, the condition of circuit damage caused by simultaneous conduction of the H-bridge drive circuit in the working process is avoided, the hardware cost is lower, and the reliability is higher than the reliability realized by software.

The present application belongs to the field of analog integrated circuit, and particularly relates to an RC oscillator without starting circuit. The present application uses Schmitt trigger as the comparator in the RC oscillator, and uses the hysteresis effect and positive feedback characteristics of the Schmitt trigger to reduce the influence of kickback noise. Meanwhile, a reset port is added to the Schmitt trigger, so that the working state of the input end of the RS flip-flop is simultaneously low when the circuit starts; and the two output signals of the RS flip-flop are respectively applied to the reset ends of the two Schmitt triggers through the delay control module, so that the reset signal of the Schmitt trigger cannot control the output result in advance before the input signal changes, and the timing error is avoided. The present application effectively solves the problems of the existing RC oscillator, such as the need of starting circuit and high noise.

The invention belongs to the technical field of integrated circuits, and particularly relates to a level shift circuit applied to a three-phase motor driving chip. According to the circuit, the acceleration function of the high-voltage floating type level shift circuit is realized, and the digital logic gate circuit is used for carrying out waveform shaping on an output signal of the high-voltage floating type level shift circuit and realizing the acceleration function. The level conversion circuit part is a high-voltage floating level shift circuit, and output signals of the level conversion part are finally output by the level shift circuit through a small number of basic logic gates, high-threshold inverters, Schmitt triggers and master-slave RS triggers. The digital logic shaping circuit has the beneficial effects that the problem of overlarge time delay of the whole circuit caused by a Miller platform existing in output signals of a high-voltage floating type level shift circuit is solved, and meanwhile, the problem of waveform logic errors of the output signals caused by delay mismatching of input end signals of an RS trigger of a traditional digital logic shaping circuit is solved.

The invention relates to the technical field of circuits, in particular to a rapid zero-crossing detection circuit and a rapid zero-crossing detection method.The rapid zero-crossing detection circuit comprises a sampling detection circuit, a differential amplification assembly, a comparison assembly and a Schmitt trigger, and the sampling detection circuit is used for obtaining the voltage of a switch output node and the voltage of a power ground node; the differential amplification component is used for respectively amplifying the voltage of the switch output node and the voltage of the power ground node to obtain the amplified voltage of the switch output node and the amplified voltage of the power ground node; the comparison component is used for outputting a zero-crossing signal when the amplified voltage of the switch output node and the amplified voltage of the power ground node meet a preset zero-crossing condition; and the Schmitt trigger is used for outputting a zero-crossing detection result according to the zero-crossing signal comparison assembly, so that the problem that a switch tube has a risk of being broken down due to too slow detection of a zero-crossing detection circuit in related technologies is solved, and the safety of circuit elements and the response speed of the zero-crossing detection circuit are improved.

The invention discloses a voltage difference monitoring circuit based on low voltage. The voltage difference monitoring circuit comprises a positive temperature coefficient current source Iptat, an NM1 tube, an NM2 tube, a diode, a resistor R3, a PM1 tube, a PM2 tube, a PM3 tube, an NM3 tube, an NM4 tube, a resistor R2 and a Schmitt trigger. The invention further discloses a voltage difference value monitoring circuit based on the high voltage. The voltage difference value monitoring circuit comprises the positive temperature coefficient current source Iptat, a PM1 tube, a PM2 tube, a diode, a resistor R5, an NM1 tube, an NM2 tube, an NM3 tube, a PM3 tube, a PM4 tube, a resistor R6 and a Schmitt trigger. According to the circuit, generation and difference comparison of zero-temperature-drift threshold voltage can be realized in a single-path structure, and more area and power consumption are saved.

The utility model discloses an integrated circuit, which belongs to the technical field of semiconductors, comprises a logic gate circuit Gata, a dead zone control unit, an over-current protection unit and a driving output unit, solves the technical problems of providing stable dead zone control, quickly responding to over-current protection and preventing simultaneous conduction of HO and LO in the process of driving an H bridge, does not need to be controlled by an MCU (Microprogrammed Control Unit), and is convenient to use. The system independence is improved, the hardware circuit response speed is high, RC delay and a Schmitt trigger are adopted, stable and reliable dead time is ensured, efficient dead time control is achieved, a current sampling resistor, a comparator and a D trigger are adopted for over-current detection, the response speed is high, an H-bridge driving signal is cut off immediately during over-current, damage is prevented, the logic gate design ensures that no driving signal exists when A = 1 and B = 1 or A = 0 and B = 0, and the system reliability is improved. H-bridge direct connection is avoided, overcurrent alarm is provided through an ALRM pin, and fault detection of the system is facilitated.

This invention relates to integrated circuit technology, specifically an on-chip aging detection circuit and an integrated circuit chip. The invention comprises a signal sampling and processing module, a voltage-controlled oscillator (VCO), and a Schmitt trigger module connected in series. The signal sampling and processing module outputs a temperature-dependent voltage signal to the VCO. The Schmitt trigger shapes the output waveform of the VCO. The VCO is composed of an odd number of identical inverters arranged sequentially. In adjacent inverters, the output of the preceding inverter is connected to the input of the following inverter; the output of the final inverter is connected to the input of the first inverter. This invention can detect the aging degree of a chip at different temperatures, with temperature having minimal impact on the detection results.

This application discloses a low-power temperature-compensated RC oscillator, comprising a low-voltage linear buffer, an RC core circuit, a comparator, a Schmitt trigger, a non-overlapping clock generator, and a level shifter. The low-voltage linear buffer uses intrinsic transistors to reduce operating voltage and power consumption; the RC core circuit employs temperature compensation technology, including a series low-temperature drift resistor and a temperature-dependent current source, causing the equivalent resistance to increase with temperature; the comparator compares a triangular wave signal with a reference voltage and outputs a reference clock; the Schmitt trigger filters out clock glitches; the non-overlapping clock generator generates a two-phase clock with dead time to control charging and discharging; and the level shifter converts the low-voltage domain clock to the high-voltage domain. This oscillator eliminates the influence of comparator offset voltage through two-phase switching control and employs low-voltage and temperature compensation technology to achieve a high-precision, low-temperature drift reference frequency in a small area with low power consumption, making it suitable for compact sensing and measurement systems.

A power sensing circuit in a first voltage domain senses an input voltage from a second voltage domain and provides a power OK signal. The maximum supply voltage of the first voltage domain is above a maximum tolerance for devices in the first voltage domain. Accordingly, protection techniques are employed to ensure that the potential difference between any two terminals of devices in the power sensing circuit does not exceed the maximum tolerance limit. The protection techniques utilize reference voltage-based techniques including level shifting and use of protection devices in transistor stacks. An over-voltage tolerant Schmitt trigger circuit is also employed in the power sensing circuit. A trip point device on the input of the power sensing circuit utilizes a programmable bias voltage to adjust the trip point of the power sensing circuit to accommodate different maximum input voltages from the second voltage domain.

This invention relates to the field of radio frequency (RF) technology, and particularly to a phase comparison circuit and an RF chip. The phase comparison circuit includes a first amplifier, a second amplifier, a first frequency divider, a second frequency divider, a first Schmitt trigger, a second Schmitt trigger, a first flip-flop, a second flip-flop, an AND gate, a first filter unit, and a second filter unit. The input of the first amplifier receives a first RF signal, and its output is connected to the input of the first frequency divider. The input of the second amplifier receives a second RF signal, and its output is connected to the input of the second frequency divider. The first and second frequency dividers are used to down-convert the amplified first and second RF signals, respectively. Compared with existing technologies, the phase comparison circuit provided by this invention has a simple structure, a wide phase detection range, stable output, and can effectively reduce the complexity of RF front-end power control.

The invention provides a radio frequency switch interface multiplexing circuit which is applied to an interface circuit of an integrated circuit. The Schmitt trigger circuit comprises a plurality of first Schmitt triggers, a plurality of second Schmitt triggers and a charge pump module. The first Schmitt triggers are used for processing MIPI signals, and the input end of each first Schmitt trigger is connected with an external input voltage, so that the radio frequency switch works in an MIPI working mode by controlling the level of the external input voltage. And the second Schmitt trigger is used for processing the GPIO signal and is powered by the charge pump module. Since the first Schmitt trigger and the second Schmitt trigger are powered by different power supplies, the radio frequency switch chip for processing the MIPI signal and the radio frequency switch chip for processing the GPIO signal can be integrated only by changing the level of the external input voltage, false triggering can be avoided, and the reliability of the radio frequency switch chip is improved. And finally, the practicability is improved, and the application is wider.

The invention relates to a high-voltage-withstanding over-temperature protection circuit for a power amplifier, and belongs to the field of integrated circuits. The over-temperature protection circuit comprises low-voltage NMOS (N-channel metal oxide semiconductor) tubes NM0-NM2, low-voltage PMOS (P-channel metal oxide semiconductor) tubes PM0-PM10, high-voltage NLDMOS (N-channel laterally diffused metal oxide semiconductor) tubes NM3-NM4, a high-voltage NLPMOS (N-channel P-channel metal oxide semiconductor) tube PM11, NPN triodes Q0-Q2, a Schmitt trigger schmitt, inverters inv1-inv2 and resistors R0-R2. The MOS tubes NM1-NM2, the MOS tubes PM0-PM1 and the resistor R0 form a self-bias current source; the MOS transistors PM2-PM3 are P-type current mirrors and copy the current of the self-bias current source; a low-voltage logic level with temperature information is provided by the MOS tube NM0, the triode Q0 and the resistors R1-R2; the flip of a logic level is realized by the Schmitt trigger schmitt and the phase inverters inv1-inv2; the MOS tubes PM4-PM9 realize conversion from low voltage to high voltage; the MOS tubes NM3-NM4 are high-voltage-resistant devices and play a role in voltage resistance; the MOS transistors PM10-PM11 and the triodes Q1-Q2 play a bias role, so that correct logic high level is output under high voltage. The over-temperature protection circuit solves the problem that the logic level is difficult to confirm under high voltage, and is simple in structure, low in power consumption and resistant to high voltage, so that the over-temperature protection circuit has very high use value and popularization value.

The application discloses a low-power-consumption temperature sensor circuit, which comprises a temperature sensing core circuit, a starting circuit, a current reference circuit and a buffer circuit; the temperature sensing core circuit is composed of a band gap reference and a positive temperature current generating circuit, and generates a voltage proportional to temperature; the starting circuit is composed of a Schmitt trigger starting circuit and a band gap reference starting circuit, and prevents latch effect from occurring when power is applied; the current reference circuit adopts a voltage-controlled current source to provide stable and load-independent current; and the buffer circuit adopts a source follower connection method of two-stage operational amplifiers, the first stage adopts a differential-to-single-end diode to load a common source amplifier structure, and the second stage adopts a current source to load a common source amplifier structure. The application does not need complex circuits such as ADC to process temperature data, and only needs a band gap reference and a positive temperature generating circuit to realize temperature detection of a chip, so that the design difficulty of the circuit is reduced, and the power consumption of the circuit is lowered.

The present application relates to the technical field of temperature control, in particular to a refrigeration control device for reagent bin temperature control, comprising a controller and a refrigeration module; the refrigeration module comprises a signal detection input unit, a voltage following unit, a first comparison circuit unit, a second comparison circuit unit, a Schmitt trigger unit, a driving output unit, an optical coupling isolation unit and an output control unit; when the reagent bin is normally working, refrigeration related control is controlled by the controller; when the refrigeration switch is opened, the controller is powered off, and the refrigeration module circuit is self-adjusted to control refrigeration, so that the problem that the refrigeration module cannot realize temperature control under the condition that the MCU is powered off and the refrigeration module circuit is continuously powered is solved.

The application provides a rising edge trigger and a low noise amplifier. The rising edge trigger comprises a first inverter, a second inverter, a capacitor, a Schmitt trigger, an inverting circuit, a NAND gate and a third inverter. An input end of the first inverter is used for connecting an enable signal for controlling the working of the low noise amplifier. A power supply end of the second inverter is used for connecting to a current outflow end of a current source for providing a reference current for the low noise amplifier. A first input end of the NAND gate is connected to an output end of the inverting circuit, and a second input end of the NAND gate is connected to an output end of the first inverter. An input end of the third inverter is connected to an output end of the NAND gate, and an output end of the third inverter is used for outputting a delay control signal. The rising edge trigger can reduce the area of the capacitor by the current size of the current source for providing the reference current for the low noise amplifier, so as to reduce the occupied area of the rising edge trigger.

The application discloses a maximum voltage automatic selection circuit and belongs to the technical field of analog integrated circuits.The maximum voltage automatic selection circuit comprises a bias circuit, a common-source common-gate current mirror circuit, a maximum voltage comparison circuit, a Schmitt trigger and a maximum voltage selection switch.The bias circuit is composed of a reference current generating circuit and a bias voltage generating circuit.The common-source common-gate current mirror circuit adopts a common-source common-gate structure.The maximum voltage comparison circuit converts an input voltage into corresponding current, and then automatically charges and discharges an energy storage capacitor according to the size of the current.The Schmitt trigger reshapes the result of the maximum voltage comparison circuit, and then drives the maximum voltage selection switch.The maximum voltage selection switch transmits the maximum voltage to an output end after being turned on.The application uses NMOS tubes to replace ordinary metal capacitors, so that the layout area of the circuit can be greatly reduced.The use of the current comparison mode and the Schmitt trigger not only increases the speed and precision of voltage comparison, but also improves the stability of the circuit.The currents generated by the reference current circuit and the mirror circuit are in the order of nano-ampere, so that the total power consumption of the whole circuit is extremely small.

This utility model relates to a water surface velocity monitoring device installed on a navigation beacon, comprising a first laser current meter, a second laser current meter, a voltage subtractor, an absolute value module, a Schmitt trigger, an electronic control switch module, and an audible and visual alarm module. The output terminal of the first laser current meter is connected to the inverting input terminal of the voltage subtractor, the output terminal of the second laser current meter is connected to the non-inverting input terminal of the voltage subtractor, the output terminal of the voltage subtractor is connected to the input terminal of the absolute value module, the output terminal of the absolute value module is connected to the input terminal of the Schmitt trigger, the output terminal of the Schmitt trigger is connected to the controlled terminal of the electronic control switch module, one end of the electronic control switch module is connected to a power supply voltage, the other end of the electronic control switch module is connected to the positive terminal of the audible and visual alarm module, and the negative terminal of the audible and visual alarm module is grounded. This utility model allows personnel to intuitively determine whether the water flow velocity collected by the laser current meter is accurate.

The application provides a CSR capacitive touch detection circuit and method, and belongs to the capacitive touch detection. The circuit comprises a variable current source module, a Schmitt trigger module, an ESD protection circuit module and a counter module. The variable current source module and the Schmitt trigger module are powered by a low dropout linear regulator, so as to reduce the influence of the power supply voltage change on the oscillation frequency. The circuit uses a variable current source to charge and discharge the touch capacitor, realizes frequency hopping oscillation through multi-gear current output, avoids fixed frequency interference, uses a single Schmitt trigger to replace a traditional comparator, and combines a novel ESD protection circuit to significantly reduce the parasitic capacitance of the touch detection foot. The circuit core is powered by an LDO, and the oscillation frequency is stabilized through temperature compensation. The application effectively improves the anti-interference ability and sensitivity, and is suitable for multi-channel capacitive touch detection applications.

The invention discloses an under-voltage locking circuit for chip power-on monitoring. The under-voltage locking circuit comprises a voltage sampling module, a single-input comparator and an output-stage three-stage structure, the voltage sampling module samples power supply voltage in proportion and directly serves as an input signal of the single-input comparator; the single-input comparator is of a two-stage structure, compares an input signal of the single-input comparator with a set threshold voltage, and outputs an output signal; and the output stage consists of a Schmitt trigger and a two-stage inverter, and is used for controlling a core circuit of the system according to the received output signal. From the aspect of structure, the structure does not need reference voltage or reference current, and the failure of the under-voltage locking circuit caused by slow response of the reference circuit can be avoided. And the reliability of the under-voltage locking circuit is greatly improved.

The application discloses an interface circuit with hysteresis and level shift characteristics, comprising a VCC power supply end, a COM end, an amplification circuit and a load circuit arranged in sequence between the VCC power supply end and the COM end, and a bias generation circuit connected with the amplification circuit and the load circuit; the bias generation circuit is also connected with the VCC power supply end and the COM end; the amplification circuit and the load circuit are connected with an output node VO; the output node VO is connected with an input end of an inverter or a Schmidt trigger; and an output end of the inverter or the Schmidt trigger is connected with the amplification circuit and the load circuit. The application can realize the hysteresis characteristic of the interface circuit, improve the noise resistance and interference resistance of the interface circuit, directly realize the level shift operation of signals, greatly simplify the circuit structure, improve the circuit reliability, and has the characteristics of simple structure, few required devices and low circuit design difficulty.

The application discloses a master-slave dual-motor synchronous control device for an automobile alternating current window, which comprises an ECU controller, a slave control board, a first direct current brush motor, a PWM feedback sampling circuit, a current sampling circuit, a microcontroller, and a signal shaping circuit. The slave control board is connected with the master control board through a multi-core flat cable, is electrically connected with the master control board and is driven by the master control board. The microcontroller is connected with the PWM feedback sampling circuit and the current sampling circuit respectively, is used for obtaining the running synchronous state of the two direct current brush motors according to the PWM feedback pulse information, and is used for obtaining the load state of the two direct current brush motors according to the running current information, so as to generate a synchronous control signal for adjusting the running of the first direct current brush motor and the second direct current brush motor. The signal shaping circuit comprises a photocoupler isolator and a Schmitt trigger which are connected in sequence. The input end of the photocoupler isolator is connected with a PWM original signal fed back by the motor. The output end of the Schmitt trigger is connected with the PWM feedback sampling circuit, so as to output a shaped PWM feedback signal.

The invention discloses an SRAM (Static Random Access Memory) PUF (Physical Unclonable Function) circuit based on Schmidt triggering, which comprises n PUF unit arrays and a load tilting circuit, each PUF unit array comprises 2m PUF units, each PUF unit is realized by adopting a symmetrical storage structure triggered by Schmidt, the load tilting circuit is used for generating two paths of loads with adjustable sizes, and when a certain PUF unit is screened to be reliable, the load tilting circuit is used for generating two paths of loads with adjustable sizes. The load tilting circuit sequentially generates two paths of loads with different sizes and loads the two paths of loads to the PUF unit, the two paths of loads generated twice in sequence are exchanged in size, the balance of the pull-down capacity of a symmetric storage structure of the PUF unit is broken, the PUF unit serves as an entropy source to generate two corresponding PUF responses, and the PUF response is obtained. Determining whether the PUF unit is reliable or not based on whether the PUF response generated twice is overturned or not; the method has the advantages that unreliable PUF units caused by random noise, voltage and temperature changes can be effectively screened at the same time, large hardware overhead cannot be increased, a large amount of factory test work does not need to be carried out, and the method is easy to popularize in practical application.

The application relates to a dynamic clock monitoring circuit and belongs to the field of integrated circuit design. The circuit comprises a first part, a second part, a third part for indefinite state setting, and resistance R, capacitor Cc, third NMOS tube N3, Schmidt trigger S1, first inverter INV1, first two-input AND gate AND1, fourth inverter INV4 and fifth inverter INV5; the first part comprises third inverter INV3, second two-input NAND gate NAND2 and first switch S1; the second part comprises first two-input NAND gate NAND1, second inverter INV2 and second switch S2; and the third part 12 comprises two PMOS tubes and two NMOS tubes. The circuit monitors the condition of the system clock through the circuit monitoring system, and outputs two kinds of monitoring signals to provide effective clock monitoring signals for the system.

The application discloses a single-chip microcomputer (MCU) delay reset circuit, and aims to solve the problem of false reset caused by unstable voltage during power-on of a power supply, and realizes self-adaptive adjustment of a delay time through a feedback circuit and a self-setting variable capacitance tube. The circuit comprises an RC delay network circuit, a Schmitt trigger and a feedback circuit comprising an operational amplifier, can dynamically adjust the capacitance value of the variable capacitance tube according to the change of the power supply voltage, and ensures the stability of the delay time. The circuit is simple in design, strong in adaptability, and suitable for various MCU systems.

This invention provides an LCD driving circuit, a liquid crystal display screen, and a display device for suppressing output fluctuations. The LCD driving circuit includes a power input module, a Schmitt trigger device, and an XON module. The power input module is connected to the Vin voltage input terminal of the Schmitt trigger device; the Vout voltage output terminal of the Schmitt trigger device is connected to the input terminal of the XON module. When the power input module is on, the Schmitt trigger device outputs a high level, and the XON module also outputs a high level, enabling the display panel to operate normally. When the power input module is off, the Schmitt trigger device outputs a low level, and the XON module also outputs a low level, allowing the display panel to release residual charge. The Schmitt trigger device is unaffected by minor fluctuations in the input voltage, maintaining stable high and low level outputs. This avoids output signal fluctuations caused by the XON module's susceptibility to minor power voltage fluctuations, suppressing output fluctuations in the driving circuit, preventing abnormal images, and enhancing display effects and user experience.