45results about How to "Stable output waveform" patented technology

The invention provides a shifting register and a thin film transistor liquid crystal displayer. The shifting register comprises multiple levels of shifting register circuits, wherein each of shifting register circuit is composed of eight transistors and two capacitors, each shifting register circuit comprises a pull-up transistor, a first pull-down transistor, a second pull-down transistor, a switch transistor, a first capacitor, a reset transistor, a first auxiliary pull-down transistor, a second auxiliary pull-down transistor, a third auxiliary pull-down transistor and a second capacitor, wherein the pull-up transistor, the first pull-down transistor and the second pull-down transistor are arranged on a signal output module, the first auxiliary pull-down transistor and the second auxiliary pull-down transistor are arranged on an auxiliary pull-down module, and the third auxiliary pull-down transistor and the second capacitor are connected in parallel. The second capacitor serves as a buffer device and can filter out redundant glitch signals of output signals and reduce signal crosstalk. Meanwhile, due to the fact that the first pull-down transistor and the second pull-down transistor respectively work in each half pull-down period, drifting of the threshold voltage due to the over-large breadth-length ratio of each transistor is restrained, and stability of circuits can be ensured. The auxiliary pull-down module is arranged, so that the output waveform of a second node is made to be more stable.

The invention relates to a portable active electroencephalogram monitor and a control method thereof, belonging to the field of medical apparatus and instruments. The electroencephalogram monitor comprises an electroencephalogram signal acquisition unit, an electroencephalogram signal analysis and storage unit and an upper computer, wherein an input and output end of the electroencephalogram signal acquisition unit is connected with a first input and output end of the electroencephalogram signal analysis and storage unit, and a first digital signal input and output end of the electroencephalogram signal analysis and storage unit is connected with an input and output end of the upper computer. The portable active electroencephalogram monitor has high stability and reliability and can be used for realizing the active long-term monitoring of accidental, transient, paroxysmal or characteristic electroencephalogram activities, and the normal life, study and work of patients can not be influenced. Because long-time electroencephalogram data can be continuously recorded, the electroencephalogram monitor has important clinic value in diagnosing epilepsia and cerebrovascular diseases and studying and analyzing sleep.

A low voltage data transmitting circuit (LVDTC) may be connected to a first transmission line that transmits a first voltage signal to a receiver and a second transmission line that transmits a second voltage signal to the receiver. The LVDTC includes a first resistor coupled to the first transmission line, a second resistor coupled to the second transmission line, and a control unit coupled to the first transmission line and the second transmission line, the control unit being configured to control voltage levels of the first and second voltage signals such that the voltage levels of the first and second voltage signals are higher than a ground voltage level of the receiver, wherein the first and second voltage signals may constitute a differential pair.

The invention relates to a device and a method for generating high-voltage pulses, in particular to a device and a method for generating bipolar nanosecond high-voltage narrow pulses. The invention solves the problems of high inductance, serious oscillation, very high tailing voltage and unstable peak value of a working circuit of a bipolar high-voltage pulse power supply in the prior art. The technical scheme is that: the device comprises a direct current high-voltage circuit module, a synchronous trigger control circuit module, a positive pulse forming circuit module, a negative pulse forming circuit module, and a high-voltage pulse synthesizing circuit module. The device and the method are applied to design circuits of high-voltage narrow pulse power supplies in the fields of desulphurization and denitrification, volatile organic compounds (VOCs) removal, material surface modification and the like.

The invention belongs to the field of integrated circuits, and relates to an anti-interference low-voltage detection circuit comprising a reference voltage circuit, a resistor voltage division circuit, a logical combination circuit, a shaping circuit, a recovery voltage setting circuit and a capacitance charge and discharge circuit. A resistor R1, a resistor R2, a resistor R3, and a resistor R4 of the resistor voltage division circuit are sequentially connected end to end. An initiating end R1 is connected to an input voltage VIN. The tail end R4 is grounded. The resistance value of R1 is equal to the resistance value of R4. An anode of a comparator in the logic combination circuit is connected with the reference voltage circuit. A voltage of a cathode is generated through voltage division by the resistor voltage division circuit. An output of an inverter 1 in the logical combination circuit is used for controlling charge and discharge of a capacitor. After the voltages generated by the two ends of the capacitor go through the shaping circuit, control signals are output, and at the same time, an output of a Schmidt shaping circuit of the shaping circuit is used for controlling the switching-on of an M1 and an M2 in order to set a recovery voltage. The anti-interference low-voltage detection circuit of the invention is advantageous in that: the anti-interference low-voltage detection circuit is strong in anti-interference capabilities, high in precision and accuracy, and easy to change.

The invention discloses a pulse type xenon lamp driver, comprising an AC220V, an AC-DC power supply circuit, a charging circuit, a capacitor bank, a discharge resistor, a main control board, an IGBT driver, an IGBT, a first diode, a temperature detector, a high voltage board, a second diode and a xenon lamp; the AC220V is connected to the AC-DC power supply circuit, the AC-DC power supply circuitis connected to the charging circuit and the main control board, the charging circuit and the main control board are bidirectionally transmitted, and the charging circuit is connected to the capacitorbank, the temperature detector is connected to the main control board, the main control board is connected to the IGBT driver, the IGBT driver is connected to the IGBT, the IGBT is connected to a positive pole of the capacitor bank and the first diode, and a negative pole of the capacitor bank is connected to the discharge resistor and the xenon lamp. According to the pulse type xenon lamp driverin the invention, the IGBT is used as a high-speed switch, the switching speed is fast, and the output pulse waveform is a square wave, thereby improving the efficiency of the xenon lamp.

The invention discloses a fuel ignite electric control circuit of vehicle engine. Wherein, the signal input part 1 is connected to the computer control box ECU of electric ignition; the over-voltage and over-current protective circuit 2 is formed by diodes D1, D2, the voltage-stabilizer tube IC2, capacitor and resistance; the shaping detecting circuit 3 is formed by diodes D3, D4 and integrated module IC1; the amplify driving circuit 4 is formed by two IGBT power composite tubes; the power output shaping circuit 5 is formed by two symmetry circuits; the power output part 6 is connected to the input of dry ignite coil. The invention has simple elements, stable output wave, and over-voltage over-current protection, while the product has better stability, to ideally control the ejection ignition and improve the service life.

The plasma scalpel power supply control system comprises an active grid-connected rectifying unit, a full-digital full-bridge LLC unit, a low-frequency voltage stabilizing circuit, an envelope line generating circuit, a high-frequency three-level H-type inverter bridge parallel group, a high-frequency high-voltage transformer and an FPGA software module which are connected in sequence. The FPGA software module is respectively connected with the active grid-connected rectifying unit, the full-digital full-bridge LLC unit, the low-frequency voltage stabilizing circuit, the envelope line generating circuit, the high-frequency three-level H-type inverter bridge parallel group and the high-frequency high-voltage transformer. Compared with a traditional power supply, isolation and safety are fully considered, and particularly, the absolute safety of a human body is fully ensured due to the addition of a capacitor charging and discharging link; besides, the working frequency can be improved from 10k level to million level, the wound is not easy to carbonize and heal during cutting, and the blood flow amount in the operation process is smaller.

The invention discloses a main control circuit capable of realizing intelligent control for a water electrolysis machine. The main control circuit comprises a testing parameter acquisition unit, a microprocessor IC5 (Integrated Circuit 5) and an electrode plate driving module, wherein the testing parameter acquisition unit is connected with the microprocessor IC5; the microprocessor IC5 is connected with a controlled electrode plate by the electrode plate driving module; the electrode plate driving module comprises a digital signal latch IC3, a digital-analog converter IC4 and a power amplification circuit; the microprocessor IC5 is connected with the controlled electrode plate by the digital signal latch IC3, the digital-analog converter IC4 and the power amplification circuit in sequence. According to the main control circuit disclosed by the invention, pH (Potential of Hydrogen) values, voltage and current feedback parameters in electrolyzed water can be measured in real time and electrolysis parameters of the electrode plate can be intelligently adjusted; the stability of power-supplying voltage of the electrode plate is good; a voltage summit elimination circuit is composed of a diode and is used for limiting the input voltage within a range of 0V-5V so as to have the effective protection effect on a voltage signal processing chip and the microprocessor; the output waveform of a constant-current and constant-voltage simulated control signal Vout is good and the stability of power supply control of the electrode plate is ensured.

The invention relates to a high-frequency signal output circuit. The high-frequency signal output circuit comprises a first signal processing circuit and a second signal processing circuit which are cascaded, a high-frequency square wave signal PWM _ IN is input into the signal input end of the first signal processing circuit, the output end of the first signal processing circuit is connected withthe input end of the second signal processing circuit, and the output end of the second signal processing circuit outputs a stable high-frequency square wave signal PWM _ OUT after amplitude modulation. An input PWM _ IN signal is a PWM square signal sent by a main chip of a vehicle control unit, a working power supply VCC serves as an amplitude modulation reference of the PWM _ IN signal, and astable high-frequency square signal PWM _ OUT is output to serve as signal sampling input of external equipment after the PWM _ IN signal is processed by the circuit provided by the invention. The high-frequency signal output circuit has the characteristics of suitability for various use occasions, wide voltage, stronger adaptability, reliable performance, stable output waveform, extremely low cost, extremely easy purchase of devices and the like.

The invention relates to a double-phase constant-current heart defibrillator which comprises a power supply module, the power supply module is sequentially connected with a charging module, an energystorage capacitor, a high-frequency converter, an H-bridge circuit and a defibrillation electrode, and the H-bridge circuit is sequentially connected with a current detection circuit, an error amplifier and a high-frequency converter. The defibrillator can defibrillate after being started, achieves deep negative feedback, reduces the size of a pulse generator, improves the success rate of defibrillation, and is stable and controllable in defibrillation current.

The present invention discloses a totem-pole circuit. The totem-pole circuit comprises a triode Q1, a triode Q2, a diode D1 and a diode D2, wherein the triode Q1 and the diode Q2 are of an NPN type. The collector electrode of the triode Q1 is connected with an input voltage Vin, the input voltage Vin is connected with the base electrode of the triode Q1 through a resistor R1, the base electrode ofthe triode Q1 is connected with the collector electrode of the triode Q2 through a diode D2, and the emitter electrode of the triode Q1 is connected with the collector electrode of the triode Q2 through a diode D1. The base electrode of the triode Q2 inputs a driving pulse signal PWM, the emitter electrode is grounded, and the collector electrode is connected with the driving output end. The circuit provided by the invention has more stable circuit performance in a high-temperature environment, and also has a reverse output function.

The invention discloses a GIP circuit for improving display quality and a driving method. The driving method comprises the following steps: a grid signal G (n-4) is written into a high potential from a t1 moment to a t2 moment, and is written into a low potential at other moments; the clock signal CKn is written into a high potential from the t1 moment to the t2 moment and after the t6 moment, and the clock signal CKn is written into a low potential at other moments; the clock signal CK (n + 4) is written into a high potential from the t1 moment to the t2 moment, the high potential is firstly written into the clock signal CK (n + 4) at the t5 moment and the t6 moment and then is written into a low potential, and the low potential is written into the clock signal CK (n + 4) at other moments; the grid signal G (n) is written into a high potential from the t3 moment to the t4 moment, and is written into a low potential at other moments; and the grid signal G (n + 4) is written into a high potential and then is written into a low potential at the t5 moment and the t6 moment. According to the technical scheme, the voltage of the Q point is suppressed by introducing the Qb node, so that the discharge path of the Q point does not directly pass through the voltage signal VGL, and the attenuation of the voltage of the Q point is effectively avoided.

The invention provides a traction inverter control system and a PWM modulation method. The system comprises a main circuit, a first processor, a second processor and a third processor. The main circuit comprises an inversion unit, the input end of the inversion unit is connected with a DC bus, and the output end of the inversion unit is connected with a load motor. The first processor is connectedwith the main circuit; the second processor is connected with the first processor and is used for generating an excitation inductance signal, an excitation current signal and a torque current signalof the load motor; the third processor is connected with the second processor and is used for generating a zero-sequence voltage regulation quantity signal, a load motor control voltage signal and a load motor control frequency signal and carrying out PWM modulation calculation to generate a modulation signal; the first processor receives the modulation signal, modulates the modulation signal to generate a switching pulse signal and sends the switching pulse signal to the inversion unit. The modulation method can realize smooth and stable switching among the modulation modes, inhibits startingcurrent impact, and is easy to realize, reliable and stable based on the control system.