275 results about "Grounded capacitor" patented technology

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.

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.

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.

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 (V_OUT) is at a node between the inductor and the capacitor, wherein V_OUT 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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).

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.

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.

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.