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855 results about "Parasitic capacitor" patented technology

Parasitic capacitance, in electrical circuits, is the extra effect of conductors that serve as plates between a dielectric, which is usually air. It becomes a problem with higher frequencies because the very small distributed capacitances that exist will have lower impedances at these frequencies.

HVAC communication system

A system for communicating across conventional HVAC wiring is provided. The system includes a communication device having a communication module capable of inducing low power, high frequency current signals into a single control wire coupling, for example, a thermostat with a compressor. The communication module includes a power supply module that draws power sufficient to operate the communication module from the existing HVAC wiring, so as to eliminate any need for batteries or external power sources. A second communication module may be coupled to the single control wire. The second communication module operates as a transceiver sending communication signals to, and receiving communication signals from, the communication module. In one embodiment, the communication module is disposed within a building, for example coupled to an electronic thermostat, while the second communication module is disposed outside the building near the compressor. The communication signals are RF modulated signals between 5 and 50 MHz so as to take advantage of and pass across parasitic capacitances found inherent in transformers or other coils disposed within HVAC loads.
Owner:ITRON +1

Electromagnetic interference cancelling during power conversion

Apparatus for cancelling electromagnetic interference (EMI) during power conversion. In one embodiment, the apparatus comprises a power converter for converting a DC input to a DC output, wherein the power converter comprises a transformer having a primary winding and a secondary winding, the secondary winding coupled to a diode such that a plurality of secondary winding voltages cause a balanced current flow through a plurality of parasitic capacitances.
Owner:ENPHASE ENERGY

Organic light emitting display

Disclosed is an organic light emitting display which has a scan driver to supply scan signals to a plurality of scan lines, a data driver to supply data signal to output lines, with a demultiplexer on each output line to supply the data signal to a plurality of data lines is disclosed. The display also has a pixel portion comprising pixels connected to the scan lines, the data lines, and pixel power source lines. There is also a power source line placed between the pixel portion and the data driver to supply first power to the pixel power source lines, and a parasitic capacitor formed on each data line to charge voltage corresponding to the data signal. With this configuration, the number of output lines provided in a data driver is decreased, and an image is displayed with uniform brightness.
Owner:SAMSUNG DISPLAY CO LTD

Capacitance type microphone with stress release membrane prepared at a low temperature and preparation method thereof

A capacitance type microphone with a stress release membrane prepared at a low temperature and a preparation method thereof. The capacitance type microphone includes a substrate having at least a resonant cavity; a septum, arranged on the top of the resonant cavity and connected with the substrate for implementing a mechanical vibration when being excitated by an acoustic pressure wave; a back board, arranged on the top of the septum and having a plurality of perforations; an air gap is provided the back board and the septum; a capacitor is composed of the septum, the air gap and the back board. The method includes steps: forming the resonant cavity on the substrate; forming the septum on the top of the resonant cavity, wherein the septum is connected with the substrate; setting the back board on the top of the septum, wherein the back board has a plurality of perforations; forming the air gap between the back board and the septum. The invention is a MEMS capacitance type microphone processed by a completely low-temperature technique. It is capable of being used as a post IC circuit processing technique being compatible thereof. The structure of the vibration diaphragm of the capacitance type microphone is a stress-releasing structure, and is capable of reducing a parasitic capacitance. Comparing with the traditional initial stress release membrane, the invention improves the sensitivity of the microphone more effectively.
Owner:王文 +1

Electric field fingerprint recognition device, state control method thereof and prosthesis identification method

The invention provides an electric field fingerprint recognition device, a state control method thereof and a prosthesis identification method. The electric field fingerprint recognition device comprises a signal acquisition module and a signal processing module. When a measurement state signal processing unit is electrically connected with a signal acquisition unit, a to-be-measured state signal processing unit is at least electrically connected with at least one signal collection unit at the periphery of the measurement state signal processing unit. The charging and discharging processes of a sensing capacitor which is electrically connected to the measurement state signal processing unit and the to-be-measured state signal processing unit, and the charging and discharging quantity of electricity of a parasitic capacitor between the measurement state signal processing unit and the to-be-measured state signal processing unit is inhibited. The device and the methods have the advantages of simple structure and saving of device cost, a problem of mutual interference between signal collection units is avoided, the fingerprint recognition device can be suitable for various application requirements, a prosthesis finger fingerprint can be judged, and the safety and the reliability of the fingerprint identification device are improved.
Owner:FOCALTECH ELECTRONICS SHENZHEN CO LTD

Manufacturing method of cavity-type film bulk acoustic resonator (FBAR)

The invention relates to a cavity-type film bulk acoustic resonator (FBAR), consisting of a silicon on insulator (SOI) substrate with a cavity and a piezoelectric thin film transducer arranged on the substrate. The FBAR is characterized in that the surface of the substratum silicon slice in the SOI substrate with the cavity is provided with a groove, substratum silicon slice and top-layer silicon are bonded to form a closed cavity structure; the upper of the top-layer silicon is provided with a transducer which is composed of a piezoelectric thin film and thin electrodes plated on the upper surface and the lower surface of the piezoelectric thin film; and a resonator can be tuned, and the thickness of the top-layer silicon can be regulated through controlling the etching time of the top-layer silicon on the upper of the cavity, thus the resonant frequency of the resonator can be regulated. As the preset cavity structure is used, in the invention, no sacrificial layer is needed, thus the chemical mechanical polishing process and the sacrificial layer release process in aboard patents and products, which are used for treating the sacrificial layer are not required; and meanwhile, in the invention, the advantages of small source parasitic capacitance, small drain parasitic capacitance, low voltage, low power consumption and the like of an SOI material are integrated, therefore, the FBAR can be compatible with an integrated circuit (IC), is easy to integrate, has simple process and is applicable to mass production.
Owner:CHINA ELECTRONICS TECH GRP NO 26 RES INST

Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter

The invention discloses a control method of an excited push-pull converter with zero-voltage switching and the excited push-pull converter. According to the magnitude of exciting current of a coupling transformer in the excited push-pull converter, the dead time of two main power MOS tube driving signals output by a controller is adjusted, in the dead time, the energy of the exciting current of the coupling transformer is used for completely releasing charges stored in a parasitic capacitor of one main power MOS tube, needing to be switched from the switch-off state to the switch-on state, in the excited push-pull converter, when diodes which are arranged in the main power MOS tube and are connected in an anti-parallel mode are switched on, the controller outputs a driving signal to control the main power MOS tube to be switched on, and zero-voltage switching is realized. The conditions for realizing zero-voltage switching of the primary MOS tube are irrelevant to the range of an input voltage and an output load, and it can be ensured that zero-voltage switching of a circuit is realized within the full-load range.
Owner:MORNSUN GUANGZHOU SCI & TECH

Radiation image detector

InactiveUS20060065845A1Eliminate noise signalSimple and inexpensive circuit configurationTelevision system detailsX-ray/infra-red processesPhysicsImage detector
A TFT readout system radiation image detector capable of satisfactorily removing noise signals generated by the parasitic capacitors formed in the vicinity of the respective intersections between gate control signal lines and charge signal lines with a simple and inexpensive circuit configuration. The detector includes charge detecting elements for storing charges generated by receiving radiation; gate control signal lines through which a gate control signal flows to control the switching element of each charge detecting element; charge signal lines to which charge signals stored in the storage sections flow out; and dummy signal lines, each being installed adjacent to each of the corresponding charge signal lines. The dummy signal flowed out to each dummy signal line is subtracted from the signal flowed out to each charge signal line when the gate signal is flowed through the gate control signal line by the differential amplifier.
Owner:FUJIFILM HLDG CORP +1
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