150 results about "Two-port network" patented technology

A high-precision, multi-port compatible, relative correction method and apparatus for correcting measurement errors covering an increase in the number of ports of a non-coaxial electronic component, in which a relative correction adapter 31 is provided that is formed of a two-port network connected to each port of a production test fixture 5B adjacent to a measurement apparatus. The relative correction adapter has a characteristic that modifies the electrical characteristics generated by the production test fixture 5B having an electronic component under test mounted thereon into electrical characteristics generated by a standard test fixture 5A having the electronic component under test mounted thereon. An error factor of the relative correction adapter 31 is identified from a standard test fixture measurement value and a production test fixture measurement value of a correction data acquisition specimen 11B. A production test fixture measurement value of the electronic component under test 11A is corrected with the error factor of the relative correction adapter 31 to thereby obtain the standard test fixture measurement value of the electronic component under test 11A which is assumed to be obtained when the electronic component under test 11A.

A notebook computer storage and charging cart includes a cart having mobile racks arranged in stacks for carrying notebook computers, a power system having electrical power connectors connectable to an external power source and battery charges connected to the electrical power connectors and controllable by a power management device to charge the notebook computers subject to a predetermined charging time, and a network unit having a network connection apparatus installed in the cart and first and second network lines respectively connected between first and second ports network connection apparatus and the notebook computers for the transmission of network signals for real-time online data update and download.

Multi-port hybrid-based cancellation networks may be used to enable simultaneous transmit and receive in one or more co-existent communication systems. A multi-port hybrid-based cancellation network may include a first and second quadrature hybrid, a first and second two-port network, and other circuitry components. The second quadrature hybrid may be distinct from the first quadrature hybrid. The first two-port network may include a first filter or a first amplifier connected between the first and the second quadrature hybrids. The second two-port network may include a second filter or a second amplifier that is distinct from but essentially the same as the first filter or the first amplifier connected between the first and the second quadrature hybrids. The other circuitry components may be connected between or connected to a connection between one of the quadrature hybrids and one of the two-port networks. These other circuitry components may have a configuration that minimizes signal return loss at least one of the ports of the multi-port hybrid-based cancellation network. They may in addition or instead have a configuration that maximizes signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.

The invention belongs to the signal test technology field and related to a multi-port S parameter test device based on a USB interface. The multi-port S parameter test device comprises a USB interface module, a source switch array, a reception switch array and a coupler array, wherein the USB interface module is respectively connected with the source switch array and the reception switch array, and the source switch array and the reception switch array are respectively connected with the coupler array. According to the multi-port S parameter test device, a two-port network analyzer which is taken as a host can be expanded into a multi-port network analyzer while cost is quite low, the multi-port S parameter test device can be used for measuring various multi-port, multi-function assemblies and modules and has advantages of simple structure and high stability.

A multi-port hybrid-based cancellation network may include a first and second hybrid coupler, and a first and second two-port network. The second hybrid coupler may be distinct from the first hybrid coupler. The first two-port network may include a first filter connected between the first and the second hybrid couplers. The second two-port network may include a second filter that is distinct from but essentially the same as the first filter connected between the first and the second hybrid couplers. Other circuitry components may be connected to one of the ports of multi-port hybrid-based cancellation network. These other circuitry components may have a configuration that increases or maximizes signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.

The invention discloses a self-tuning magnetic-coupling resonance wireless energy transmission system and a self-tuning method thereof. The system comprises a transmitting terminal circuit and a receiving terminal circuit, wherein the transmitting terminal circuit is formed by electrically connecting a high-frequency power supply, a transmitting terminal power matching circuit, a transmitting terminal directional coupler detection circuit, a transmitting terminal tuning capacitor and a transmitting coil in sequence; the receiving terminal circuit is formed by electrically connecting a receiving coil, a receiving terminal tuning capacitor, a receiving terminal directional coupler detection circuit, a receiving terminal power matching circuit, a rectifying and converting circuit and a load in sequence; and a two-port network is formed by the transmitting coil, the receiving coil, the transmitting terminal tuning capacitor and the receiving terminal tuning capacitor. The invention has the advantages that: 1, the self-tuning process is conducted online, and the system has strong self-adaptive ability; 2, the self-tuning control structure is simple and easy to implement; 3, and the system is kept in a magnetic-coupling resonance state, and has high power transmission efficiency.

The invention relates to a motor rotor turn-to-turn short circuit fault detection method based on frequency response analysis. The method comprises the following steps of: S1, establishing a frequency response analysis model, which is a passive linear two-port network, wherein N over-the-ground distributed capacitances C with unit length are connected between an input end and an output end of the two-port network in parallel; S2, sequentially inputting sine-wave voltage signals Vs with different frequencies; S3, digitally recording over-the-ground voltage signals Vi (n) and Vo (n) on two ends of the two-port network; S4, obtaining a transfer function H (n) being equal to 20log [Vo (n)/ Vi (n)]; and S5, plotting frequency responses into a curve according to frequency, and computing a correlation coefficient between frequency response curves measured by two times, wherein if the correlation coefficient is smaller than 1, a turn-to-turn short circuit is proved to exist in a motor rotor winding. According to the motor rotor turn-to-turn short circuit fault detection method based on frequency response analysis, the accuracy for judging the motor rotor turn-to-turn short circuit fault can be improved, and the reliability of motor operation is improved.

The invention discloses an over-voltage absorbing protective circuit capable of accurately presetting a protection value. The over-voltage absorbing protective circuit capable of accurately presetting the protection value is composed of an absorbing element protection unit, a reference voltage, a comparator, an electric control switch, a capacitor and three resistors. According to the over-voltage absorbing protective circuit capable of accurately presetting the protection value, an absorbing protection element can be connected to a two-port network where a spike voltage is located at the moment that a voltage spike exceeds a preset safety voltage, the energy of the spike is absorbed, and the spike voltage value is limited, so that the element in the circuit is protected; when the spike voltage at the two ends of the two-port network reduces to a considered safe value, the absorbing protection element is rapidly disconnected with the circuit, so that normal operation of the circuit is not influenced by the absorbing protection element.

A method for the error correction of a vectorial network analyzer, where a primary system calibration is initially implemented using a calibration kit. Following this, a first, secondary error correction is implemented on at least two one-port networks of the vectorial network analyzer. After this first, secondary error correction of the one-port networks of the vectorial network analyzer, a second, secondary error correction is implemented, where either two one-port networks are through-connected in an ideal manner or a measurement is implemented on a reciprocal two-port network. The corrected system-error values from the first, secondary error correction are used even in this further measurement, and overall, a high-precision, calibrated multi-port network analyzer is obtained.

The invention discloses a method for analyzing influences of a grounding hole on signal integrity on the basis of the FDTD algorithm. The method comprises the following steps that firstly, a signal conversion layer is divided into different reference planes according to specific circumstances of a high-speed signal conversion layer; secondly, an equivalent pi model is established according to analysis of a signal through hole structure; thirdly, the grounding hole is analyzed through the FDTD algorithm; fourthly, by means of the S parameter extracted through HFSS simulation software and a two-port network of the equivalent pi model, the parasitic parameters of the through hole in the 3 GHz range is calculated; fifthly, an FDTD calculation result and an HFSS simulation result are analyzed and compared; sixthly, the S parameter and a time domain response continue to be compared under the condition that the grounding hole exists or does not exist, and the improvement effect of the grounding hole on the signal integrity is determined. The influence of the grounding hole on the signal integrity is accurately judged, and the mutual influence of signals between the signal conversion layer of a PCB and the grounding hole is greatly reduced.

The invention discloses a dynamic equivalent circuit model considering electrochemical characteristics of a battery and an operating method thereof. The dynamic equivalent circuit model is a two-port network and comprises a voltage source Uoc varying along with the SOC (State of Charge), a resistor R0 representing ohmic internal resistance of the battery, a first RC parallel connection module representing SEI membrane impedance inside the battery and an embedded RC double-layer parallel connection module which are sequentially connected in series according to the current flowing direction, wherein the embedded RC double-layer parallel connection module is composed of a second RC parallel connection module, a resistor Rct and a double-layer capacitor Cdl, the second RC parallel connection module is connected with the resistor Rct in series and then connected with the double-layer capacitor Cdl in parallel, the second RC parallel connection module represents diffusion of ions inside the battery, the resistor Rct represents charge transfer, and the double-layer capacitor Cdl represents a capacitance characteristic that the ions transfer because of being subjected to influences of an electric field force and the density gradient inside the battery. Model parameters of dynamic equivalent circuit model have physical significance, part of the component parameters change along with the current, and a problem that a power battery model is low in cycle precision is solved.

The invention provides a performance detecting method and system of a radio frequency terminal. The performance detecting method of the radio frequency terminal comprises steps of: using the output pin, connected with the radio frequency terminal, of a radio frequency chip as a first testing port; using an antenna solder joint connected with the radio frequency terminal as a second testing port, wherein the first testing port, the radio frequency chip, the radio frequency terminal, and the antenna solder joint form a two-port network; and testing the corresponding radio frequency performance of the two-port network by using a testing device connected with the first testing port and the second testing port. The method may be independent of the radio frequency chip, directly detects and debugs the radio frequency terminal which is viewed as a two-port network, is compatible with more active and passive testing methods, modularly analyzes and solves radio frequency matching problems, and improves radio frequency output overall performance.

The invention relates to a rapid test data processing method of a spherical multi-probe antenna based on microwave network analysis. Based on an idea of microwave network analysis, the to-be-tested antenna and a probe system are seen as an open two-port network, excitation is equivalent to input of the network, reception signals of probes are equivalent to output, a transmission equation of the antenna is derived strictly via coordinate rotation, and a far-field directional diagram of the to-be-tested antenna is solved via the reception signals of the probes and probe response constants of different areas. The program operation speed is improved greatly, and the test data processing time of the antenna is shortened.

The invention provides an energy efficiency metering detection method of a distribution transformer. The method comprises the following steps: S1, establishing a reactive-loss two-port network model of the distribution transformer; S2, calculating an energy efficiency value of the distribution transformer in the reactive-loss two-port network model; S3, according to the energy efficiency value, establishing an energy efficiency detection device of the distribution transformer on the actual work condition and detecting an energy efficiency value of the distribution transformer on the actual work condition by using the detection device. According to the method, the energy efficiency value of the transformer on the actual work condition can be measured accurately; the uncertainty of measurement instrument introduction is low; adaptability is high; and the actual application value is great.

The invention is a magnetic integrated DC/DC conversion boost transmission ratio extension circuit and a high boost transmission ratio circuit, and as realizing the stage extension of a boost-type transmission ratio extension two-port network from stage n to n+1, the inductance and diode regularly increase by degrees, i.e. adding an inductance and three diodes can realize the extension from the stage n to n+1; the DC/DC conversion boost transmission ratio extension circuit with extended stage number n (2<=n<=500) is applied to a traditional boost converter, which composes a like-polarity high boost transmission ratio circuit, where the transmission ratio M=n/(1-D); and as the DC/DC conversion boost transmission ratio extension circuit with extended stage number n (2<=n<=500) is applied to a traditional buck-boost converter, which composes a reversed-polarity high boost transmission ratio circuit, where the transmission ratio M=-(nD)/ (1-D); it can realize the magnetic integration of many inductances in a boost transmission ratio extension circuit by adopting magnetic integrated multi-winding coupled inductance.

The invention discloses an analysis method of carrying out paralleling reactor optimization configuration on an offshore wind power plant outgoing line terminal submarine cable. In the method, optimization configuration theory calculation of paralleling reactors is performed on an offshore-wind-power-plant no-load submarine-cable long line and two ports of an offshore booster station system component are networked so as to acquire a transition function of a no-load long line tail terminal voltage to a power-supply electromotive force. Mathematical analysis is performed on the transition function, different paralleling reactor configuration schemes are compared so that an effect of carrying out charging power reactive compensation on the no-load submarine cable long line tail terminal paralleling reactors is the best, an effect of carrying out reactive compensation on the paralleling reactor of two ends of the submarine cable simultaneously comes second and an effect of carrying out reactive compensation on a head terminal of the submarine cable is worst. Finally, analogue simulation verification is performed; electromagnetic transient analysis software PSCAD is used to establish a model and the no-load submarine cable under different paralleling reactor configuration schemes is operated in a simulation mode; compensation effects are compared and theory calculation correctness is verified.

The invention discloses a microwave device path coupling transmission performance predicting method based on single gold wire bonding. The microwave device path coupling transmission performance predicting method comprises the steps that structural parameters, electromagnetic parameters and material attributes of a single gold wire bonding wire are determined; the single gold wire bonding wire isequivalent to a resistor and an inductor; a single gold wire bonding wire bonding pad is equivalent to two parallel-plate capacitors; the equivalent two-port network form of the single gold wire bonding wire and its bonding pad is determined; the length of the single gold wire bonding wire is calculated; the skin depth of the single gold wire bonding wire is calculated; a series resistor and a series inductor of an equivalent two-port network are determined; the pole plate separation distance of the capacitors is calculated; shunt capacitance of the equivalent two-port network is determined; atwo-port network impedance Z parameter is calculated; a microwave device transmission S parameter is calculated; a path coupling model of the transmission S parameter and structural parameters of thesingle gold wire bonding wire is established; the microwave device transmission performance under single gold wire bonding is calculated. By adopting the method, quick prediction and analysis of themicrowave device transmission performance under different structural parameters of the single gold wire bonding wire are achieved.

The invention provides an improved distribution transformer energy efficiency measuring detection method. The method comprises the steps that 1 an equivalent two-port network model of a distribution transformer is built; 2 according to the equivalent two-port network model, an energy efficiency calculation model of the distribution transformer is determined; and 3 according to the energy efficiency calculation model, an energy efficiency detection device of the distribution transformer in actual conditions is built, so as to measure the energy efficiency value of the distribution transformer in actual conditions. Compared with the prior art, the improved distribution transformer energy efficiency measuring detection method provided by the invention has the advantages that the energy efficiency value of the distribution transformer in actual conditions can be accurately measured, and can be used as an important reference basis of energy saving data; and the method can be applied to the distribution transformer to precisely analyze and calculate energy efficiency measuring and judge energy efficiency level.

A second-order bandpass filter having an improved frequency response is disclosed, in which a grounding capacitor is connected electrically to a two-port network as a feedback path so as to provide two finite transmission zeros. With the two transmission zeros, signals of second harmonic frequency and GSM signals may be blocked out from the pass band of the filter and thus filtered out. As such, the filter may be utilized in wireless local area network (WLAN) application. Further, since no extremely small value component is used within the filter, the frequency response may not be influenced by a manufacturing process of the filter. In addition, the thus formed filter has a relatively smaller volume.

The invention discloses testing structures for three-port RF devices. The testing structures comprise the first testing structure, the second testing structure and the third testing structure. The tested devices in the three testing structures are identical, sequentially, one port of each device is connected with a resistor in series, and other two ports of each device are connected with G-S-G testing ports; for the resistors connected in series to the first testing structure, the second testing structure and the third testing structure, resistance testing structure sets are arranged respectively, and each resistance testing structure set comprises the fourth testing structure, the fifth testing structure, the sixth testing structure and the seventh testing structure. Each fourth testing structure comprises a tested resistor, and two ports of each tested resistor are connected with the G-S-G testing ports. Each fifth testing structure is an open de-embedding structure of the corresponding fourth testing structure. Each sixth testing structure and each seventh testing structure are a first through de-embedding structure and a second through de-embedding structure of the corresponding fourth testing structure. The invention further discloses a testing method for the three-port RF devices. As RF parameter testing of the three-port RF devices can be achieved through a two-port network analyzer, testing cost can be greatly lowered, and testing efficiency can be improved.

The invention discloses a microwave device circuit coupling transmission performance testing method taking double gold bonding wire mutual induction into account. The method includes the steps that structural parameters, electromagnetic parameters and material attributes of double gold bonding wires are determined; the ith gold bonding wire is equivalent to a resistor and an inductor, and welded discs are equivalent to two plane-parallel capacitors; an equivalent two-port network form between the ith bonding wire and the welded dics at the two ends of the ith bonding wire is determined; the wire length and the skin depth are calculated; a serial resistor Ri, an inductance value, a mutual inductance value, a serial inductor Li, an electrode plate interval and a parallel capacitor Ci which are in the network are determined; whether or not the double gold bonding wires are equivalent to the welded discs at the two ends of the double gold bonding wires is judged; under the double gold bonding wires, the equivalent two-port network form, an equivalent impedor, a serial resistor R, a serial inductor L, a parallel capacitor C and open-circuit impedance parameters are determined; microwave device transmission parameters are calculated; a coupling model is established; the microwave device transmission performance is calculated under the double gold bonding wires. The microwave device circuit coupling transmission performance testing method taking the double gold bonding wire mutual induction into account achieves the purpose that the microwave device transmission performance is rapidly predicted and analyzed under the different structural parameters of the double gold bonding wires.

The invention provides an AC transmission line harmonic transmission characteristic analysis method. The method comprises steps: according to a two-port network transfer equation of the transmission line, a frequency length factor is obtained, wherein the frequency length factor is the product of the phase shift constant and the length of the transmission line; a harmonic transmission model is obtained by using system operation parameters and the frequency length factor; and according to the harmonic transmission model, the harmonic transmission characteristics of a half-wavelength transmission line are obtained. Through the AC transmission line harmonic transmission characteristic analysis method provided in the invention, the harmonic transmission characteristics of the front end and thetail end of the half-wavelength line can be qualitatively and quantitatively analyzed, and the problems that the existing harmonic transmission characteristic analysis method can not determine the harmonic voltage of the half-wavelength line, the current front-tail end voltage transmission amplification law and the resonant frequency characteristics can be solved.