30results about How to "Simple application circuit" patented technology

The invention discloses an energy saver for an AC contactor, which comprises a half-wave rectification circuit, a square-wave generation circuit, a DC voltage-regulated power supply circuit, a signal converter and a charge/discharge circuit. The half-wave rectification circuit is used for half-wave rectification of mains power, the square-wave generation circuit is used for providing square-wave input for the signal converter, the DC voltage-regulated power supply circuit is used for providing a stable DC power supply for the signal converter, the signal output end of the signal converter is used for providing a control signal for the charge/discharge circuit, and the load of the charge/discharge circuit is an AC contactor. The current of the coil of the AC contactor can be changed through changing the pulse width of the output end of the signal converter, thereby realizing that the high current can flow through the coil of the AC contactor when the contacts of the AC contactor are closed, and the low current can flow through the coil of the AC contactor when the closed state of the contacts of the AC contactor is maintained. Therefore, the invention realizes the energy-saving operation of the AC contactor, reduces the noise and the temperature rise of the coil of the AC contactor, and prolongs the service life of the AC contactor.

The present invention relates to a projecting capacitive touch sensing device, a display panel, and an image display system. The projecting capacitive touch sensing comprises an array of a plurality of sensing units, each sensing unit including: a first electrode made of a sensing material, at least one second electrode made of a sensing material and being disposed around the peripheral of the first electrode, at least one first sensing axis electrically connected to the first electrode, and at least one second sensing axis electrically connected to the second electrodes. The first electrode is quadrangle, while the second electrodes are triangular-shaped. The first electrode and the plurality of second electrodes are arranged to form a rectangular, and a non-sensing area is defined between the first electrode and the second electrodes.

A capacitive touchpad comprises two traces with a plurality of first and second sensors coupled thereto respectively, and the first and second sensors are arranged interlaced and uneven spaced to each other. By detecting the capacitance variances produced by the sensors from the traces, phase leading or lagging Z-axis signals are generated to determine the moving direction of a finger sliding on the capacitive touchpad.

The invention discloses a touch device and a touch method thereof used for providing an input signal to a computer device. The computer device executes an application program according to the input signal. The touch device comprises a touch pad and a processing module. The touch pad is molded along a trace in general. The section area of the touch pad is increased gradually from a first end of the trace to a second end thereof. The processing module is used for providing the input signal to the computer device. When a finger moves on the touch pad, the processing module generates the input signal related to the finger according to the variable quantity of the capacitance value of the touch pad. The invention uses a capacitor type touch pad with the appearance of gradually increased section area as a single trace line to lessen the quantity of the trace line of the prior capacitor type touch pad so as to reduce the cost and simplify the application circuit.

The invention discloses a static magnetic characteristic measuring apparatus, comprising a detection module, a control module and an operation module, wherein the detection module comprises an N-shaped magnet, an excitation coil wound on the magnet and a Hall element placed at one end of the magnet; the control module comprises a programmable logic controller (PLC), an A/D converter, an excitation power supply, a relay and a switching power supply; the PLC is electrically connected with the A/D converter; the coil of the relay is electrically connected with the PLC; the ports of the relay arerespectively electrically connected with the excitation coil and the excitation power supply; the output end of the Hall element is electrically connected with the input end of the A/D converter; thepower supply end of the Hall element is electrically connected with the switching power supply; and the operation module comprises an industrial computer electrically connected with the control module. The measuring apparatus dispenses with demagnetization during measuring, thus realizing continuous measurement of the magnetic characteristic parameters and improving the efficiency of measurement.

The invention provides a microelectronic phase-sensitive receiver. The microelectronic phase-sensitive receiver is simple in structure, can accurately and reliably trigger a relay to work and achieves the abnormity alarm function and the like. According to the microelectronic phase-sensitive receiver, two measurement circuits with an MCU1 and an MCU2 as cores are the same in structure, local voltage and track voltage are connected to A/D input pins of the MCUs through miniature mutual inductors, the MCUs collect two paths of voltage waveforms of a period, the initial phase angles and the effective values of the two paths of signals are calculated through a Fourier transform algorithm, a phase difference is solved, logic judgment is carried out, square signals are output when the condition is met, amplification, isolation transmission and rectification filter are carried out on the square signals, and the square signals wait for selection and output. An MCU3 collects and calculates four paths of voltage, a result is compared with a processing result of the MCU1 and a processing result of the MCU2 respectively, whether the voltage is normal or not is judged, one path of voltage is selected according to a set strategy, an output voltage amphenol connector outputs direct current voltage to enable a 1700 relay to work, and an alarm signal is given out if necessary.

The invention relates to a constant current and constant voltage control circuit based on a sampling resistor in a chip. By arranging a routing resistor or a Poly resistor which can be formed in the chip as a sampling resistor, peripheral elements of the IC can be reduced, for example, the external sampling resistor of the IC is not needed, the precision of output current can be improved or stabilized, and the cost saving and efficiency improvement are facilitated. The constant current and constant voltage control circuit comprises a chip packaging body which is provided with a switch control pin, the outer side of the switch control pin is connected with one end of an inductor, the other end of the inductor is a constant current output end, and the sampling resistor in the chip is arranged between the other end of the inductor and the output voltage node of a dual-power tube.

The invention discloses an analog-digital converter. The analog-digital converter comprises a hardware adder and a proportional amplifier; the hardware adder comprises two DAC chips; a digital signalis converted into a current signal through the DAC chips, the current signal is introduced to be externally connected with a linear operational amplifier and then is converted into a corresponding analog voltage signal, and the analog voltage signal is converted into a voltage required for actual control after passing through the proportional amplifier; and the proportional amplifier is used for carrying out proportional amplification on the voltage generated by the hardware adder to achieve the voltage required for actual control. The analog-digital converter has the following beneficial effects: 1, the system noise is reduced to a certain extent, the effective digit number of measurement is increased, and the effective digit number of the DAC is increased to 32 bits in reality; and 2, the new 32-bit high-resolution DAC is relatively easy in the wiring aspect of a PCB.

The invention provides an integrated chip for detecting human body oxyhemoglobin saturation. The integrated chip comprises a red light diode driving circuit, a red light photoelectric transducer, a first current-voltage conversion circuit, an infrared light diode driving circuit, an infrared light photoelectric transducer, a second current-voltage conversion circuit, an analog-digital conversion circuit and a digital signal processing circuit. The red light diode driving circuit is connected with a red light diode. The output end of the red light photoelectric transducer is connected with the first current-voltage conversion circuit. The output end of the first current-voltage conversion circuit is connected with the analog-digital conversion circuit. The infrared light diode driving circuit is connected with an infrared light diode. The output end of the infrared light photoelectric transducer is connected with the second current-voltage conversion circuit. The integrated chip has the advantages that an application circuit is simplified, the equipment for measuring human body oxyhemoglobin saturation is greatly miniaturized, and the cost is reduced.

The invention discloses a flammable gas detection system based on NB-IOT Internet of Things, which comprises a CPU module, a communication module, a SIM card module, a power module, a combustible gasdetection module, a clock module, a communication module, and a flammable gas detection module. The clock module is connected to the CPU module, and the communication module is connected to the SIM card module. The power module supplies power to each module. The invention has the following advantages: having a gas intelligent alarm system based on the Internet of Things; the trinity of an indoor gas detection system, a small-scale gas information convergence point and a server fully conforms to the current concept of intelligent integration in the field of science and technology, and is suitable for most residential buildings. The design is closely integrated with the knowledge of the Internet of Things based on the concept of providing protection for people lives and property, which has the characteristics of low cost, no pollution, high versatility and high security.

The invention discloses a novel methane sensor which comprises a supporting base, an outer protective shell, a metal filter screen, an air inlet hole, a first filter, a double-layer organic filter screen, a second filter, a welding base, shaft bases, a ceramic electrode chip and a lead column, the second filter is arranged at the bottom end of the double-layer organic filter screen, and the welding base is fixedly connected to the top end of the supporting base; four shaft bases are fixedly mounted in the welding base; the methane sensor is simple in structure, the preparation process is simple, the heating resistor of the ceramic electrode plate applied to the methane sensor can be accurately controlled, the working voltage and current of the ceramic electrode plate can be designed and manufactured in batches according to application scene requirements, the ceramic electrode adopts semi-mechanical welding, the welding efficiency is high, the welding cost is low, meanwhile, a rapid standard packaging process is adopted, and the detection part of the sensor is accommodated in a standard TO-5 metal package, so that the sensor is small in size, low in power consumption, high in use sensitivity, long in service life, low in cost and simple in application circuit.

The invention discloses an MCU type intelligent PIR sensor signal processing device which comprises an ultrahigh input impedance interface circuit, a Sigma-Delta type ADC, a digital bandpass filter, a microprocessor, an I2C interface circuit, a band gap reference circuit, a high-speed oscillator and a low-speed oscillator. A signal of a PIR sensor is sequentially processed through the ultrahigh input impedance interface circuit, the Sigma-Delta type ADC, the digital bandpass filter and the microprocessor; the microprocessor processes output data of the digital bandpass filter, and advanced filtering and functional control are achieved in a software mode. The I2C interface circuit is connected with and communicated with other peripheral hosts, and intelligent processing and control are achieved. By means of the MCU type intelligent PIR sensor signal processing device, an application circuit can be simplified, systems stability can be improved, and intelligentization and microminiaturization of equipment in the smart home field in the Internet of Things are achieved.