Abstract: A magnetoelectric device includes reluctance components, damping modules and a driving module. Each reluctance component includes a magnetic core unit having a loop-shaped first segment and a second segment connected to the first segment, first to third coils wound around and loosely coupled to the first segment, a first capacitor connected between the second and third coils, and a second capacitor connected to the third coil in parallel. Each damping module receives electrical energy from a respective reluctance component, and releases electrical energy to a DC power source. The driving module connects the DC power source to each first coil in such a way that a respective AC voltage is generated across each first coil.
Abstract: Systems and methods are disclosed for reducing an interwinding capacitance current in a transformer. In certain embodiments, the transformer includes a coupling winding and a primary winding that encircles a portion of the coupling winding. Additionally, the transformer includes a secondary winding that encircles a portion of the coupling winding. The transformer includes a shield terminal which is electrically coupled to the coupling winding. The shield terminal directs currents, such as interwinding capacitance currents, in the coupling winding to ground.
December 28, 2012
Date of Patent:
February 21, 2017
General Electric Company
John Stanley Glaser, Joseph Taher Mossoba
Abstract: The frequency generated by a high-frequency high-voltage generator is set to a higher one of the frequencies of two coupled modes which take place when a resonance circuit of a power transmission device and that of a power reception device are coupled to each other. For this reason, charge generated on an active electrode of the power transmission device and that generated on an active electrode of the power reception device have the same polarity, while an electric potential of a passive electrode of the power transmission device and that of a passive electrode of the power reception device have the same polarity. When the passive electrode of the power transmission device is connected to the ground, the electric potential of the passive electrode is zero V. Therefore, the electric potential of the passive electrode of the power reception device is substantially zero V.
Abstract: A coupling apparatus (1) having a mains connection (2) for connection to a low-voltage mains power supply system, and having an appliance connection (3) for connection of any appliance for transmitting and/or receiving an RF signal has a voltage converter (5) and a high-pass filter (6.1, 6.2). The voltage converter converts the mains voltage which is present at the mains connection to a very-low voltage, which is suitable for supplying the appliance connected to the appliance connection. Inductances (4.3 to 4.6) of suitable size are interposed in the appropriate connecting lines as low-pass filters for decoupling the RF signal path from the supply signal path, and for suppressing undesirable, radio-frequency signal components in the supply voltages. RF signals which are transmitted or are to be transmitted via the low-voltage mains power supply system are coupled from the mains connection via the high-pass filter to the appliance connection, and from the appliance connection to the mains connection.
Abstract: A signal coupler includes a transformer having a primary and a secondary winding. Each transformer winding has a pair of associated winding terminals and is also split at an intermediate winding position to form a pair of supplemental winding terminals. Circuitry is provided between each pair of supplemental winding terminals so as to provide different impedances in different frequency bands. In particular, a first circuit, which provides a first impedance in a first frequency range, is connected across the supplemental winding terminals of one winding. A second circuit, is connected across the supplemental winding terminals of the other transformer winding. This second circuit, in combination with the first, provides a second impedance in a second frequency range. In the disclosed embodiment, the first circuit provides an impedance of 600 ohms in the voiceband frequency range. The second circuit in combination with the first provides an impedance of 100 ohms in a frequency range extending above 40 kHz.
Abstract: A high-efficiency amplifier (10, 18) that may be used in, for example, a radar system to amplify signals received at an exciter (22) before they are applied to an antenna (20). The amplifier includes, among other components, an adaptive matching network (48) that is controlled by a processing system (26) to allow the amplifier to be adaptively matched to the load as the operating frequency of the system undergoes changes. Specifically, the network is adjusted based upon information regarding the ratio R of reflected power over incident power measured at the load the last time the system operated at the same frequency. As a result, the system is able to respond more quickly to frequency changes.
Abstract: A circuit for combining first and second signals having the same frequency. The signals have a relative phase shift, 2a(t). The circuit generates a signal that is proportional to the sum or difference of signals. The circuit appears to be a resistive load; however, the circuit can be constructed from purely reactive circuit elements, and hence, does not dissipate energy. In one embodiment, the circuit is constructed from a transformer and two LC circuits in which the capacitance is varied in response to a(t). The circuit may be used to construct a high efficiency RF amplification stage.
Abstract: An isolation amplifier including a full-wave modulator which applies to the primary winding of an isolation transformer an attenuated version of the input signal, to reduce the flux density in the transformer without the need for a complicated flux-nulling feedback arrangement. This is a wide-band modulator with means for protection against the adverse effects of thermal drift in the attenuator. Two or more resistors create a resistive divider across the signal and ground terminals of the isolator's input port. A tap on the resistive divider is connected to the input of a first buffer amplifier whose output is connected in series with a capacitor to one lead of the primary winding of the transformer. The signal input is supplied to one throw of an SPDT analog voltage switch, the other throw of which is connected to ground. The pole of the switch is connected to the input of a second buffer amplifier and the output of that buffer is connected to the other lead of the transformer primary.
Abstract: A coupling filter is formed from a plurality of four terminal networks. Each active four terminal network preferably has a bypass admittance, two filter admittances, a feedback admittance, and an amplifier. One end of the bypass admittance and of the filter admittances are connected to each other and to the input of the four terminal network, and one end of the feedback admittance is connected to the other end of the first filter admittance and to the input of the amplifier. The remaining ends of the second filter admittance and of the feedback admittance, as well as the output of the amplifier, are connected to each other and to the output of the four terminal network. Thus, except for the first four terminal network and the last four terminal network, the input of each four terminal network is connected by way of a coupling admittance to the output of the preceding four terminal network and said input is connected by way of a second coupling admittance to the output of the following four terminal network.
Abstract: An apparatus for driving a reactive load, comprises a plurality of N multnput elements N .gtoreq. 2, connected in parallel, capable of amplifying a band of frequencies. Two inputs of each element can be connected to sources of direct-current voltage. Each circuit element and elements connected to its inputs define a circuit stage. N means, each means connected to at least one of the inputs of the circuit elements, are capable of equalizing the gain of each of the N stages within a prescribed percentage. A transformer having N primary, input, windings and one secondary output, winding, is connectable to the load. Each of the N primary windings have their inputs connected to one of the inputs of the circuit elements. The transformer is so designed that its impedance, usually inductive, as seen from the load, balances the capacitive load, to be connected to it, over the bandpass of interest.
August 11, 1977
Date of Patent:
August 8, 1978
The United States of America as represented by the Secretary of the Navy
Abstract: Disclosed is an isolation amplifier, wherein a DC input signal is applied to the primary winding of a saturable reactor, the secondary winding of which is coupled with an oscillating circuit so as to supply the secondary circuit with a high-frequency current, and then the current flowing through the secondary winding is applied to a feed-back type low-pass filter, with which an output signal proportional to the DC input signal is extracted from the current flowing through the secondary winding.