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275 results about "Grounded capacitor" patented technology
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Capacitance of a Grounded Capacitor. Suppose one plate of the capacitor is grounded which means there is charge present at only one plate. We know that the potential across the capacitor will be 0, i.e., V=0. So it means that the capacitance of a grounded capacitor is Infinite.
Low loss band pass filter for RF distance telemetry pin antennas of active implantable medical devices
InactiveUS20070123949A1Low costMultiple-port networksAnti-noise capacitorsCapacitanceBand-pass filter
A hermetic terminal for an active implantable medical device (AIMD), includes an RF distance telemetry pin antenna, a capacitor conductively coupled between the antenna and a ground for the AIMD, and an inductor electrically disposed in parallel with the capacitor and conductively coupled between the antenna and a ground for the AIMD. The capacitor and the inductor form a band pass filter for attenuating electromagnetic signals through the antenna except at a selected frequency band. Values of capacitance and inductance are selected such that the band pass filter is resonant at the selected frequency band.
Owner:WILSON GREATBATCH LTD
Multiple frequency plasma chamber with grounding capacitor at cathode
InactiveUS6857387B1Reduce and eliminate couplingImprove performanceElectric discharge tubesSemiconductor/solid-state device manufacturingElectricityCoupling
An apparatus and method for fabricating an electronic workpiece in which first and second electrodes within a plasma chamber are respectively connected to low frequency and high frequency RF power supplies. At least one capacitor is connected between the first electrode and electrical ground. The one or more capacitors can reduce or eliminate the coupling of high frequency RF power to any plasma outside the region directly between the two electrodes. Consequently, the invention can improve the performance of the plasma process by concentrating more of the RF power in the region between the two electrodes.
Owner:APPLIED MATERIALS INC
High-sensitivity insulation resistance detection method and circuit for ungrounded DC power supply system
InactiveUS20150285850A1Improve leakage currentEasily detect valueVery high resistance measurementsImpedence measurementsElectrical resistance and conductanceDc current
The present invention is a high-sensitivity insulation resistance detection method and circuit for an ungrounded DC power supply systems. When the ratio of the voltage of the positive bus to that of the negative bus exceeds a preset range, the DC current is injected into the ungrounded DC power supply systems. DC power supply systems have essentially some grounded stray and external capacitors, so some of the injected DC current will flow into the grounded capacitor, increasing the voltage of the fault bus and the leakage current. The proposed method increases the leakage current by the injection of DC current, so the current sensor can detect the leakage current from which the insulation resistance can be calculated. The DC current injection method can significantly improve the detection of ground insulation faults in ungrounded DC power supply systems.
Owner:KAO YUAN UNIVERSITY OF TECHNOLOGY +1
Load compensated switching regulator
ActiveUS20080007241A1Avoid switchingImprove efficiencyElectric variable regulationPower conversion systemsControl signalVoltage regulation
A load compensated voltage regulator comprises a chip including a control section having an error amplifier, a pulse width modulator (PWM), the PWM outputting at least one driver control signal. At least one driver has an input coupled to receive the driver control signal. An output stage includes at least one output transistor having an input coupled to an output of the driver. The output transistor drives an inductor in series with a grounded capacitor, wherein an output of the regulator (VOUT) is at a node between the inductor and the capacitor, wherein VOUT generates a load current across a load when connected across the capacitor. A feedback connector is provided for feeding back a feedback signal representative of the load current to circuitry for outputting a gate driver voltage supply control signal based on at least reference level and the feedback signal. A connector couples at least one power supply to the driver through a switch or a second regulator. The gate driver voltage supply control signal is coupled to the switch or regulator, wherein the gate driver voltage supply control modulates a voltage level of the gate driver voltage supply between at least two different levels based on the load current.
Owner:INTERSIL INC
Low impedance oxide resistant grounded capacitor for an AIMD
ActiveUS9108066B2Multiple-port networksAnti-noise capacitorsElectrical conductorElectrical connection
A hermetically sealed filtered feedthrough assembly for an AIMD includes an insulator hermetically sealed to a conductive ferrule or housing. A conductor is hermetically sealed and disposed through the insulator in non-conductive relation to the conductive ferrule or housing between a body fluid side and a device side. A feedthrough capacitor is disposed on the device side. A first low impedance electrical connection is between a first end metallization of the capacitor and the conductor. A second low impedance electrical connection is between a second end metallization of the capacitor and the ferrule or housing. The second low impedance electrical connection includes an oxide-resistant metal addition attached directly to the ferrule or housing and an electrical connection coupling the second end metallization electrically and physically directly to the oxide-resistant metal addition.
Owner:WILSON GREATBATCH LTD
Low impedance oxide resistant grounded capacitor for an AIMD
A hermetically sealed filtered feedthrough assembly for an active implantable medical device includes an electrically conductive ferrule hermetically sealed by a first braze to an insulator. A conductor is hermetically sealed to and disposed through the insulator. A filter capacitor has an active electrode plate and a ground electrode plate which are disposed within and supported by a capacitor dielectric in an interleaved, partially overlapping relationship. A first passageway is disposed through the capacitor dielectric having a capacitor internal metallization which is connected to the active electrode plate. A capacitor external metallization electrically connects to the ground electrode plate. An oxide-resistant metal addition includes a conductive core with a conductive cladding of a different material. A first electrical connection is between the oxide-resistant metal addition and the capacitor external metallization. A second electrical connection is between the oxide-resistant metal addition and the ferrule.
Owner:WILSON GREATBATCH LTD
Grid-tie inverter
ActiveCN102714469ASuppresses common mode currentDc-ac conversion without reversalGrid-tie inverterThree-phase
The disclosed grid-tie inverter is provided with: a single-phase or three-phase inverter (1) which changes a DC voltage supplied from a DC power supply (5) to a pulse-width modulated voltage; a first capacitor circuit (41) which is connected so as to form a neutral point (c) on the input side of the inverter (1); a second capacitor circuit (42) which is connected so as to form a neutral point (f) on the output side of the inverter (1); a common mode current bypass channel (g) which is formed by connecting the neutral point (c) on the first capacitor circuit (41) and the neutral point (f) on the second capacitor circuit (42); a grounded capacitor (11) which is provided between the bypass channel (g) and the earth; a first common mode choke coil unit which is provided with common mode choke coils (31, 32) in at least one location between the first capacitor circuit (41) and the inverter (1) or the inverter (1) and the second capacitor circuit (42), and which uses the inverter (1) to suppress generated common mode current; and an output filter (2) which converts the pulse-width modulated voltage waveform output from the inverter (1) to a sinusoidal single-phase or three-phase AC voltage.
Owner:KK TOSHIBA
Low impedance oxide resistant grounded capacitor for an AIMD
A hermetically sealed filtered feedthrough assembly for an AIMD includes an electrically conductive ferrule with an electrically conductive extension at least partially extending into the ferrule opening. An electrically non-conductive insulator hermetically seals the ferrule opening. An electrically conductive pathway is hermetically sealed and disposed through the insulator between a body fluid and device side. A filter capacitor is located on the device side. A first low impedance electrical coupling is between a first metallization of the filter capacitor and the pathway. A ground conductor is disposed through the filter capacitor in non-conductive relation with the at least one active and ground electrode plates, where the ground conductor is electrically coupled to the extension of the ferrule. An oxide-resistant metal addition is disposed on the device side and electrically couples the ground conductor to the second metallization of the filter capacitor.
Owner:WILSON GREATBATCH LTD
Discontinuous Transmission Line Structure
InactiveUS20080048799A1Suppressing high-frequency noise signalSmall sizeDelay linesCapacitanceInductor
A discontinuous transmission line structure includes an input transmission line, an output transmission line, a plurality of meandered inductors, coupled in series between the input transmission line and the output transmission line, and a plurality of shunted to grounded capacitors, coupled between the meandered inductors. The discontinuous transmission line structure has a high inductance and a high capacitance, and can effectively reduce the size by increasing the transmission line load impedance and capacitance while the characteristic impedance of the transmission line structure remains.
Owner:WANG CHAO WEI +2
Load compensated switching regulator
ActiveUS7345463B2Improve efficiencyElectric variable regulationPower conversion systemsControl signalVoltage regulation
Owner:INTERSIL INC
Low impedance oxide resistant grounded capacitor for an aimd
ActiveUS20150343224A1Lower impedanceAnti-noise capacitorsElectrotherapyCapacitanceElectrical conductor
A hermetically sealed filtered feedthrough assembly for an AIMD includes an electrically conductive ferrule with an electrically conductive extension at least partially extending into the ferrule opening. An electrically non-conductive insulator hermetically seals the ferrule opening. An electrically conductive pathway is hermetically sealed and disposed through the insulator between a body fluid and device side. A filter capacitor is located on the device side. A first low impedance electrical coupling is between a first metallization of the filter capacitor and the pathway. A ground conductor is disposed through the filter capacitor in non-conductive relation with the at least one active and ground electrode plates, where the ground conductor is electrically coupled to the extension of the ferrule. An oxide-resistant metal addition is disposed on the device side and electrically couples the ground conductor to the second metallization of the filter capacitor.
Owner:WILSON GREATBATCH LTD
Improved 2.4GHz LTCC power divider
InactiveCN104332687AReduce in quantityCompact structureMultiple-port networksCoupling devicesMiniaturizationInductor
The invention provides an improved 2.4GHz LTCC power divider of which the structure comprises an input port P1, a first output port P2, a second output port P3, a first external side printing ground G1, a second external side printing ground G2, a third external side printing ground G3, an internal ground GND, a ground capacitor C1, an output parallel-connected capacitor C2, a first electric inductor L1, a second electric inductor L2, an isolation resistor R and a printing mark M. Working frequency range is 2.3GHz-2.5GHz, which covers all frequency range of 2.4GHz application. The circuit mode adopted by a common lumped parameter power divider is improved with respect to the structure so that the number of elements is effectively reduced, element value is reduced, and thus the power divider is enabled to be more suitable for batch production of miniaturized devices. The improved 2.4GHz LTCC power divider has substantial advantages of being compact in structure, small in size, high in output isolation, low in insertion loss, great in phase consistency and high in amplitude balance degree.
Owner:NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
Radio frequency power amplifier
InactiveUS20110003566A1Improve isolationImprove efficiencyResonant long antennasTransmissionEngineeringRadio frequency
An RF power amplifier according to the present invention includes: an RF power amplifying element, a first switch provided in a first transmission path for transmitting a first RF signal output from the RF power amplifying element, a second transmission unit which transmits a second RF signal of higher frequency than the first RF signal output from the RF power amplifying element, and a second second-order harmonic trap circuit connected to an output terminal, and the second transmission unit includes a grounded capacitor, a second transmission path, a Band-I matching circuit, a second switch connected in series to the second transmission path, and the second switch connects the second transmission path to the grounded capacitor when the first RF signal is amplified, and connects the second transmission path to the Band-I matching circuit when the second RF signal is amplified.
Owner:PANASONIC CORP
L-band miniature low-pass filter
InactiveCN103078158AImprove electrical performanceLow yieldWaveguide type devicesCapacitanceCo-fired ceramic
The invention discloses an L-band miniature low-pass filter. The low-pass filter has two transmission zeros, the prototype is a fifth-order Chebyshev low-pass filter, an equivalent lumped parameter element is implemented by means of an LTCC (low-temperature co-fired ceramic) multilayered structure, and the L-band miniature low-pass filter comprises two stages of parallel resonant units, three stages of parallel ground capacitors, an input port and an output port; under the same technical index condition, the size of the filter is greatly reduced, and out-of-band harmonics are effectively suppressed. The L-band miniature low-pass filter has the advantages of small size, light weight, high integration degree, little in-passband insertion loss, good standing waves, good high-end suppression, high temperature stability, high consistency in the electrical property indexes of batches, low mass production cost and the like, and is applicable to corresponding communication systems having rigorous requirements on size, weight, performance and reliability, such as radio frequency transceiving front ends.
Owner:NANJING UNIV OF SCI & TECH
Universal testing system and method of line selection apparatus of low-current grounding system
ActiveCN105403810AEasy to compareTo achieve the purpose of mutual verificationFault location by conductor typesSimulationPower grid
The invention discloses a universal testing system and method of a line selection apparatus of a low-current grounding system. A function circuit simulation model is established, a plurality of distribution network outlet ground capacitors are simulated by using a plurality of capacitors with different impedance values, a single-phase voltage source simulates a secondary zero-sequence voltage source at a single-phase ground fault time of a distribution network, and a ground arc suppression coil and a parallel medium resistor are connected; primary line selection function comparison testing on a tested device is carried out by using the function circuit simulation model; a distribution network simulation model is established based on actual parameters, different types of feeder circuit ground faults are simulated, and comprehensive line selection performance comparison testing is carried out on the tested device in detail according to the distribution network simulation model; recording data of the field ground fault of the distribution network are collected, a fault working condition is reproduced, and a fault recording playback simulation model is constructed. According to the invention, the actual working condition of the field ground fault of the distribution network is restored to the greatest extent; and the influence on grid safety by testing projects like artifical grounding and the like can be eliminated.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
Device and method for super-fast transient overvoltage simulation of metal oxide voltage limiter
ActiveCN102998556AImprove accuracyTruly reflect the action pressure limiting characteristicsElectrical testingCapacitanceOvervoltage
The invention provides a device and a method for super-fast transient overvoltage simulation of a metal oxide voltage limiter. The device uses a voltage limiter core resistor R(i) to simulate characteristics, verifying along with current, of an equivalent resistor of the voltage limiter core. The voltage limiter core resistor R(i) is connected with a voltage limiter core capacitor C1 in parallel to form a RC loop to simulate high-frequency response characteristics of the voltage limiter core. The voltage limiter core capacitor C1 depends on a high-frequency capacitor of a voltage limiter valve block and the voltage limiter core structure. A voltage limiter connecting inductor L is formed by high-frequency inductors, connected with conductors, inside the voltage limiter. The RC loop is connected with the inductor L in series to form a RLC loop and is connected with a ground capacitor C2 of the voltage limiter in parallel. Accordingly, the method for super-fast transient overvoltage simulation of the metal oxide voltage limiter is formed, voltage limiter characteristic simulation computing under super-fast transient overvoltage is achieved, and limit action of the voltage limiter on super-fast transient overvoltage and application range of the voltage limiter are analyzed.
Owner:CHINA ELECTRIC POWER RES INST +1
Miniature LTCC 1.8-GHz power divider with built-in resistor
ActiveCN104362997ASmall phase differenceEasy to useMultiple-port networksShunt capacitorsPhase difference
The invention discloses a miniature LTCC 1.8-GHz power divider with a built-in resistor. The miniature LTCC 1.8-GHz power divider with the built-in resistor comprises a surface-mounted 50-ohm impedance input port, an input inductor, a first spiral inductor, a second spiral inductor, a ground capacitor, a shunt capacitor, two vertical ports, two first parallel ports, two second parallel ports, the built-in tantalum absorption resistor, a first output inductor, a second output inductor, a first surface-mounted 50-ohm impedance output port, a second surface-mounted 50-ohm impedance output port and a ground plate. The miniature LTCC 1.8-GHz power divider is made of LTCC materials in a three-dimensional integrated mode and has the advantages that use is easy and convenient, the size is small, the isolation degree is high, the insertion loss is low, the phase difference between the two output ports is small, the reliability is high, the electrical performance and the temperature stability are good, the cost is low, and mass production can be achieved.
Owner:深圳波而特电子科技有限公司
Filter device with finite transmission zeros
InactiveUS20090189716A1Reducing frequency responseReduce areaResonatorsWaveguidesTransmission zerosDual mode
A filter device with transmission zeros is provided according to the present invention, which has an odd mode resonant frequency and an even mode resonant frequency. The filter device includes: a substrate, a metallic rectangular ring, a signal couple-in / couple-out module, and a metallic ground plane, wherein the surface of said metallic ground plane is parallel to the plane enclosed by said metallic rectangular ring, and said metallic rectangular ring applied to the filter device of the present invention has a perimeter shorter than or equal to the wavelength corresponding to the mean of said odd mode resonant frequency and said even mode resonant frequency, thereby allowing said filter device of the present invention, in a situation of specific bandpass frequency, to reduce its perimeter to about half of the perimeter of conventional annular rectangular dual mode filters. In addition, the locations of the transmission zeros can be changed by adjusting the length / width ratio of said metallic rectangular ring, and the frequency response of the filter signal can also be reduced by disposing a ground capacitor module. Accordingly, the area of the dual mode filter can be greatly reduced. Furthermore, the frequency response of the filter signal can be increased by disposing a ground inductor module, accordingly, decreasing the size of dual mode filter and providing a means of easy fabrication thereof.
Owner:NAT TAIWAN UNIV
Floating memristor emulator
InactiveUS20160378896A1Cost reduction and easeReduction and ease of implementationDigital storageComputation using non-denominational number representationMemristorGrounded capacitor
The floating memristor emulator is based on a circuit implementation that uses grounded capacitors and CFOAs in addition to combinations of diodes and resistors to provide the required nonlinearity and time constants. This circuit results in low power consumption, cost reduction and ease of implementation because it avoids the use of multipliers, ADCs and RDACs. The present circuit is used in an FM demodulator, which exploits the frequency-dependence of the memristance. Successful use in the FM demodulator confirmed the functionality of the present floating memristor emulator circuit.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Insulation parameter detecting method for mine low-voltage cable
InactiveCN104133114AOvercome limitationsInsulation resistance to groundImpedence measurementsCapacitanceLow voltage
The invention discloses an insulation parameter detecting method for a mine low-voltage cable. The insulation parameter detecting method includes the steps that (1), the frequency of low-frequency signals is selected, according to the selecting principle, it is ensured that the injected low-frequency signals can not reduce insulation parameters of a power grid, the sensitivity of a protective device is improved, setting and filtering of a secondary circuit are facilitated, zero-sequence power-frequency signals and harmonic signals are finally filtered out, the injected low-frequency signals are reserved, and the anti-interference capacity is improved; (2), a low-frequency power source is output through an isolation transformer, enters the power grid through a three-phase electric reactor SK and is grounded through a ground capacitor and an insulation resistor of the power grid to form a low-frequency current circuit; (3), the low-frequency voltage signals and the low-frequency current signals are measured, phase difference exists between the voltage and the current, and a calculation formula of the insulation parameters is calculated and derived; (4), an insulation resistor formula is obtained; (5), a calculation formula of distributed capacitors is obtained.
Owner:李磊 +1
Power distribution truth value simulation test method and power distribution truth value simulation test device
The invention relates to a power distribution truth value simulation test method and a power distribution truth value simulation test device. The power distribution truth value simulation test device comprises a voltage regulator, a boosting transformer, a switch, a series reactor, a ground capacitor, a computer measurement and control analysis unit, a power distribution network ground fault unit dG, a power distribution network phase fault unit xG, a power distribution product test unit SP and the like. The voltage regulator and the boosting transformer are used for boosting to a nominal voltage of a power distribution network, an operation mode and parameters of a simulation power distribution network are changed and excited to generate an overvoltage for experimental study on production mechanisms and protective measures of overvoltage in the power distribution network; by means of the power distribution network ground fault unit dG and the power distribution network phase fault unit xG, experimental study on fault mechanisms, fault processes, fault recovery and fault treatment measures of the power distribution network can be realized; by employing of the power distribution product test unit SP, dynamic tests and fault tests of the tested network are simulated according to power distribution truth values, and correctness of technical parameters and relevant functional parameters of power distribution products is analyzed by the computer measurement and control analysis unit.
Owner:李景禄
Direct current insulation monitoring method and device
The invention relates to a direct current insulation monitoring method which comprises sampling resistors, large-resistance resistors, small-resistance resistors and switching tubes. The large-resistance resistors, the small-resistance resistors and the sampling resistors are connected in series between an anode and the ground and between a cathode and the ground respectively, and the two small-resistance resistors are connected in parallel with the switching tubes respectively. Insulation resistance values of the anode and the cathode can be obtained by making and breaking the two switching tubes respectively, measuring voltage values across the sampling resistors and making calculation on the measured values. The method has the advantages that with the adoption of the low-voltage switching tubes, quick making and breaking can be achieved, the measurement speed is high, the cost is lower, and the influence of a ground capacitor in a system is small, so that the robustness and measurement precision are high. The invention further provides a direct current insulation monitoring device.
Owner:BEIJING THAISEN TECH
Multifunctional flexible grounding device
ActiveCN108462162AMeet different planning and operation needsAdequate compensation neededEmergency protective arrangements for limiting excess voltage/currentCapacitanceControl manner
The invention discloses a multifunctional flexible grounding device, which comprises a transformer, a voltage source inverter, a winding current detection unit, an amplifier, a PWM drive signal generation unit, a capacitance current detection unit and a neutral point voltage detection unit. The winding current detection unit is used for generating a current signal. The amplifier amplifies the current signal to obtain a reference signal. The voltage source inverter is used for generating a current or voltage which is in the same frequency as the reference signal and acts on the secondary side winding of the transformer. The neutral point is grounded through the arc suppression coil, and the capacitance current detection unit is used for detecting the current of the grounding capacitor and calculating the first amplification factor, and the primary side winding of the transformer is equivalent to the continuously adjustable inductance. When the neutral point is grounded through the smallresistor, the neutral point voltage detection unit detects the neutral point voltage and calculates the second amplification factor, and the primary side winding of the transformer is equivalent to acontinuously adjustable small resistor. By means of different control modes, the two neutral point grounding modes can be realized without adjusting devices.
Owner:HUAZHONG UNIV OF SCI & TECH
Noise filter array
InactiveCN101490953AWell formedEffective noise removalMultiple-port networksTransformers/inductances detailsElectrical conductorResonance
Provided is a noise filter array wherein inductances of LC serial resonance circuits of a plurality of filter elements can be independently adjusted while maintaining a simple configuration as a whole. The filter elements (F1-F4) composed of an LC parallel resonance circuit and the LC serial resonance circuit, which have coils and capacitors, are arranged in parallel in an array and integrally formed. Inductance adjusting conductors (L12-L42), which configure the LC serial resonance circuit with grounding capacitors (C12-C42), which configure the filter elements (F1-F4), are separately connected to the signal side electrode (8) of the capacitors (C12-C42). A grounding side electrode (9) of the capacitors (C12-C42) are arranged to commonly face the signal side electrodes (8).
Owner:MURATA MFG CO LTD
Power circuit device
ActiveUS20180007785A1Limited supplyConversion constructional detailsCross-talk/noise/interference reductionEngineeringPower circuits
Even when a grounding capacitor is included at either end of a common mode coil, there is noise that flows from a load into a metal frame, and there is a need to restrict an amount of noise propagating to a system power supply. Because of this, a noise loop is formed of a rectifier circuit, an inverter, a first electrical wire that connects a positive polarity side of the rectifier circuit and the inverter, a second electrical wire that connects a negative polarity side of the rectifier circuit and the inverter, a ground wire terminal that can connect a load connected to an output terminal or the inverter, and a conductive plate that connects at least one or the first electrical wire and second electrical wire and the ground wire terminal.
Owner:MITSUBISHI ELECTRIC CORP
LED power-source circuit and illumination fixture using the same
ActiveUS20100231138A1Reduce capacityReduce noiseElectrical apparatusElectroluminescent light sourcesCapacitanceEngineering
An LED power-source circuit includes an input filter circuit including noise prevention capacitors and a line filter, a diode bridge connected to the input filter circuit, a smoothing capacitor connected to an output of the diode bridge and having a capacitance of 1 μF or less, a DC-DC conversion circuit connected to the smoothing capacitor, and an LED assembly connected to an output of the DC-DC conversion circuit. Grounding capacitors are coupled to ground from an input power line between the line filter and the diode bridge. The total capacitance from the input power line to ground is set to be 1 / 200 or less of that of the smoothing capacitor.
Owner:PANASONIC CORP
Nth-order arbitrary-phase-shift sinusoidal oscillator structure and analytical synthesis method of making the same
Nth-order voltage- and current-mode arbitrary phase shift oscillator structures are synthesized using n operational trans-conductance amplifiers (OTAs) or second-generation current controlled conveyors (CCCIIs) and n grounded capacitors. Linking up the I / O characteristics of the OTA and the CCCII and the reactance of grounded capacitor, the step of synthesis is first based on the algebraic analysis to oscillatory characteristic equations, resulting in a quadrature oscillator structure. Secondly, instead of the quadrature characteristic, to control each output signal with one another by a desired phase difference > or <90°, selectively superposing any of two fundamental OTA / CCCII-C sub-circuitries benefits the transformation of quadrature to arbitrary-phase-shift characteristic for the sinusoidal oscillator structure. Furthermore, several compensation schemes are presented for reducing the output parameter deviation due to the non-ideal effects.
Owner:CHUNG YUAN CHRISTIAN UNIVERSITY
Output current monitoring device for voltage reduction type conversion circuit
InactiveCN102566732AQuick monitoringAccurate monitoringEfficient power electronics conversionDc-dc conversionPhase currentsCapacitance
Owner:HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
Method for measuring capacitive current of low-current grounding power grid
InactiveCN106771647AReduce the impact of measurement accuracyMeasure securityCapacitance measurementsMeasurement using digital techniquesDigital signal processingCapacitance
The invention relates to a method for measuring capacitive current of a low-current grounding power grid. The method comprises an HC-1 capacitive current tester and a measurement device, wherein the HC-1 capacitive current tester injects a 5Hz constant-current square wave signal into a zero-sequence circuit of a power distribution network, carries out charging and discharging on a grounding capacitor of a line to measure the grounding capacitive current of the power distribution network; the measurement device comprises an AC / DC power supply system, a digital signal microprocessor, a signal collection unit and a power electronic inverter circuit; the digital signal microprocessor controls the power electronic inverter circuit to generate the 5Hz constant-current square wave signal, and injects the 5Hz constant-current square wave signal into the zero-sequence circuit of the system through a bus open delta of the system, a grounded variable neutral point or a neutral point of a capacitor bank; and a high-performance A / D sampling circuit and digital signal processing are adopted by a signal collection system.
Owner:STATE GRID TIANJIN ELECTRIC POWER +1
Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor
The invention discloses a filter circuit for inhibiting a harmonic signal of a mobile terminal and a method therefor, wherein the filter circuit is arranged on an output line of an RF power amplifier of the mobile terminal for inhibiting the harmonic signal. Firstly, ground capacitors C1 and C2 are connected on the output line of the RF power amplifier of the mobile terminal, then an inductor L2 and a capacitor C3 are connected in parallel to form a band stop filter, and finally the band stop filter is connected between the ground capacitors C1 and C2 in series. As the inductor L2 and the capacitor C3 are both adjustable, the resonant frequency parameters of the inductor L2 and the capacitor C3 are adjusted, so as to not only achieve unattenuated passing through of the useful signal, but also have targeted inhibition for a signal at secondary harmonic frequency point, therefore, the good effect is obtained.
Owner:SHANGHAI WINGTECH ELECTRONICS TECH
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