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 proposes a sound sensing circuit based on an operational amplifier, which is used for detecting sound and generating a sound sensing signal. The sound sensing circuit comprises a sound signal detection circuit, a one-stage amplification circuit, a signal processing circuit, a two-stage amplification circuit and a shaping circuit. The sound signal detection circuit generates an electrical signal through a voice input device and then sends the electrical signal to the one-stage amplification circuit; and after the electrical signal is amplified, the electrical signal is processed by the signal processing circuit, specifically including that a capacitor C3 performs AC coupling on the signal and a capacitor C4 performs envelope detection on the signal and then the two-stage amplification circuit amplifies the signal, after that, a shaping signal is generated by a Schmidt shaping circuit in the shaping circuit and the shaping signal is outputted by an inverter. After detection, the sound sensing circuit based on the operational amplifier provided by the invention effectively identifies sound signals with a frequency below 20kHz; moreover, the power consumption of the circuit is low, and the quiescent current is about 250muA; and since the circuit has an enable pin, the working state of the circuit can be controlled by signals, thus the overall power consumption can be reduced in combination with other chip applications.

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 present invention proposes a traction inverter control system and a PWM modulation method, the system includes a main circuit, a first processor, a second processor and a third processor; the main circuit includes an inverter unit, and the input end of the main circuit is connected to a DC The bus bar, the output end of the main circuit is connected to the load motor; the first processor is connected to the main circuit; the second processor is connected to the first processor to generate the excitation inductance signal, excitation current signal and torque current signal of the load motor; The third processor is connected with the second processor, and is used to generate zero-sequence voltage adjustment signal, load motor control voltage signal, load motor control frequency signal, and perform PWM modulation calculation to generate modulation signal; the first processor receives modulation The signal is modulated to generate a switching pulse signal and sent to the inverter unit. The modulation method can realize smooth and stable switching among various modulation modes, suppress the impact of starting current, and meanwhile, based on the control system, it is easy to implement, reliable and stable.

The invention relates to a wireless power transmission device and more particularly relates to a resonance type wireless power transmission device. By virtue of the resonance type wireless power transmission device, the problem of no consideration for both transmission efficiency and transmission distance in the existing wireless power transmission device is solved. The resonance type wireless power transmission device comprises an MSP430F149 single chip microcomputer, a first IR2110 driving chip, a second IR2110 driving chip, a third IR2110 driving chip, a transmitting module, a receiving module, first to fourth MOS tubes, first to eleventh diodes, first to fourth keyboard switches, a first bulb, a second bulb, first to seventh resistors and first to eleventh capacitors, wherein the transmitting module comprises a transmitting coil, a first resonance capacitor, a second resonance capacitor and a first dial switch; the receiving module comprises a receiving coil, a third resonance capacitor, a fourth resonance capacitor, a second dial switch and a third dial switch. The resonance type wireless power transmission device is applicable to wireless power transmission.