43results about How to "The detection circuit is simple" patented technology

A multi-threshold complementary metal-oxide semiconductor (MTCMO) bus circuit reduces bus power consumption via a reduced circuit leakage standby and pulsed control of standby mode so that the advantages of MTCMOS repeater design are realized in dynamic operation. A pulse generator pulses the high-threshold voltage power supply rail standby switching devices in response to changes detected at the bus circuit inputs. The delay penalty associated with leaving the standby mode is overcome by reducing cross-talk induced delay via a cross-talk noise minimization encoding and decoding scheme. A subgroup of bus wires is encoded and decoded, simplifying the encoding, decoding and change detection logic and results in the bus subgroup being taken out of standby mode only when changes occur in one or more of the subgroup inputs, further reducing the power consumption of the overall bus circuit.

A capacitance-type touch panel, allowing disturbance noise and touch detection time to be reduced and having a simple configuration, is provided. The capacitance-type touch panel including: a plurality of drive electrodes each having a strip shape; a drive control circuit performing control such that a drive signal for touch detection is selectively applied to the drive electrodes; a plurality of touch detection electrodes arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and each outputting a detection signal in synchronization with the drive signal; and a detection circuit detecting an external proximity object based on the detection signal. The drive control circuit controls application of the drive signal in such a manner that the detection signal is a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of the external proximity object.

A wireless charging system load estimation method comprises the following steps: A, detecting voltage rising edge zero cross points before a rectifier bridge input voltage and a rectifier bridge input inductance, and obtaining a rising edge zero cross point time; B, selecting voltage adjacent rising edge zero cross points before the rectifier bridge input voltage and the rectifier bridge input inductance in a circle, and solving a rising edge zero cross point time difference; C, obtaining a wireless charging system work frequency, and measuring the rectifier bridge input inductance value; D, estimating the wireless charging system load according to the voltage rising edge zero cross point time difference before the rectifier bridge input voltage and rectifier bridge input inductance, the wireless charging system work frequency and the rectifier bridge input inductance value; E, randomly selecting a plurality of time slots of different durations, carrying out a statistics process on the wireless charging system load estimation results in the time slots, and obtaining an estimation value.

A capacitive touch keyboard includes an insulating substrate that defines a plurality of press key zones, and a first and a second conductive layers, both disposed on the insulating substrate. Each conductive layer includes a plurality of electrode lines arranged in two different directions. Each electrode line includes a plurality of electrode units connected in series. Each electrode unit is disposed at a position corresponding to a respective one of the press key zones. For each of the press key zones, the electrode units of the first the second conductive layers that are disposed therein are adjacent to each other and cooperate to form a touch sensing structure.

The receiver portion of a UWB wireless device is altered by replacing analog-to-digital circuitry with a simple energy detection circuit. In embodiments of the invention, the coding methodology of a transmitter is altered to support the simplified receiver configuration. For example, instead of coding the data to be sent in the phase of the UWB signal, the data is encoded in a binary fashion in discrete frequency subbands of the UWB signal. Although this may reduce the usable bandwidth of the channel, it also decreases the complexity and power consumption of UWB devices. In another embodiment of the invention, a UWB device is able to select a transmission mode (BPSK or Energy Coding) based on its environment. Moreover, in a further embodiment of the invention, receiving devices may switch between coding modes based on the capabilities of a remote transmitter and / or a peer receiver.

A detecting circuit for pixel electrode voltage of a flat panel display device, the flat panel display device having a plurality of scanning lines and a plurality of data lines crossing with the plurality of scanning lines, the plurality of scanning lines and data lines define a plurality of pixel units, and each of the pixel units including a pixel switching element and a pixel electrode. The detecting circuit for pixel electrode voltage includes at least one detecting sub-circuit for pixel electrode voltage. The detecting sub-circuit for pixel electrode voltage includes: a signal amplifying unit connected with the pixel electrode in the pixel unit, for amplifying a voltage signal of the pixel electrode; and a signal detecting unit connected with the signal amplifying unit, for detecting the voltage signal of the pixel electrode that has been amplified by the signal amplifying unit, and outputting a variation in the voltage signal of the pixel electrode with time. Compared with the prior art, the present invention has advantages of simple detecting circuit structure and accurate detection result.

The invention is a protection circuit with high-speed detection of IGBT short-circuit faults, including a detection control circuit, an HSF short-circuit detection circuit, a FUL short-circuit detection circuit, an OR gate logic circuit, a gate drive circuit, a soft turn-off circuit and a gate resistor R G . The invention also discloses a method for protecting the IGBT short-circuit fault. The present invention respectively detects two short-circuit types of hard switch short-circuit fault and on-load short-circuit fault, proposes a corresponding detection circuit, and sets a detection control circuit to control the working state of the short-circuit detection circuit; the soft-off circuit short-circuits the IGBT Turn off the processing, and lock the output signal of the drive circuit at the same time. Invention on gate voltage V GE and drive voltage V GG For detection, the detection circuit is simple, the short-circuit detection time is short, the short-circuit fault can be processed quickly and reliably, and the power device is effectively protected.

The invention discloses a compound structure sensor and a compound correction method for moisture content and electrical conductivity of a culture substrate. The compound structure sensor comprises a flat plate compound electrode, a thermal resistance temperature sensor and a signal detection circuit which are integrated on the substrate. The flat plate compound electrode comprises four pairs of electrodes on front and back surfaces; the four pairs of whole electrodes are electrical conductivity detection sensitive elements; two pairs of the electrodes in the middle are moisture content detection sensitive elements; the two types of sensitive elements work in a time-sharing mode. The compound correction method comprises the following steps: firstly, carrying out temperature compensation on the detected moisture content according to a relation between temperature and the moisture content to obtain a moisture content corrected value; carrying out the temperature compensation on a detected electrical conductivity value according to a relation between the temperature and the electrical conductivity to obtain an electrical conductivity corrected value; finally, carrying out moisture content compensation on the corrected electrical conductivity by the corrected moisture content according to a relation between the moisture content and the electrical conductivity, so as to obtain an electrical conductivity corrected value. After temperature and moisture content compensation and correction are carried out, a detection result has the advantages of high accuracy, good stability, high adaptability and the like.

The invention discloses a method and a device for testing tail end insulation of a primary winding of an electromagnetic voltage transformer, and aims to accurately and rapidly detect the insulation state of the tail end of a primary winding of an electromagnetic voltage transformer under a condition of electrification, achieve potential fault detection and detect the insulation state of the tailend of the primary winding according to zero sequence voltage variations caused when a vee connection winding of the electromagnetic voltage transformer is in short circuit. Short circuit switches areconnected with two ends of the vee connection winding of the electromagnetic voltage transformer, a waveform acquisition module is connected with a measuring or metering winding of the electromagnetic voltage transformer, the short circuit switches are controlled to be closed for a certain time and then cut off, at the same time three-phase voltage waveforms of the measuring or metering winding are acquired by using the waveform acquisition module and are combined to form zero sequence voltage waveforms, and the insulation state of the tail end of the primary winding connected with a harmonicwave eliminator, of the electromagnetic voltage transformer, is judged according to zero sequence voltages of the closed short circuit switches and the fluctuation situations of the zero sequence voltages of the closed short circuit switches.