54 results about "Stabistor" patented technology

Circuitry and techniques designed to allow stable and continuous delivery of alternating power to a plasma with switch-mode power supply (16) include a variety of embodiments. Parallel, series, and other circuit elements connected across switching element (7) are tuned so that energy at other than the fundamental frequency is absorbed and dissipated. This energy may be only at the second harmonic or it may be across broad frequency ranges through selecting high impedance at the fundamental frequency and relatively low impedance at other frequencies. In overcoming instabilities, oscillations, and even changing class of operation of the switch-mode power supply, the stabilizing element absorbs the energy to avoid allowing it to affect switch (7) of power supply (16).

A reader of a magnetoresistive head includes a spin valve with sensor having a stabilizing hard bias and side shield at the side of the sensor, to substantially reduce the undesired flux from adjacent bits and tracks. At least one free layer is spaced apart from at least one pinned layer by a spacer. Above the free layer, a capping layer is provided. The stabilizer may include an insulator, a soft material that is a shielding layer, a decoupling layer, and a hard bias. As a result, the free layer is shielded from the undesired flux of adjacent tracks, and recording media having substantially smaller track size and bit size can be used.

The invention discloses a design method of a stabilizer of a power system in the technical field of stable control of the power system. The method comprises the following steps: selecting a variable corresponding to maximum feedback gain from a full-state feedback gain matrix of the system as a primary variable; and adjusting the feedback gain of the primary variable for realizing the control of damping of the system, and setting a zero point of the system in a matching way for adjusting oscillation mode. By adopting the method, low-frequency oscillation of the system is effectively inhibited, the problem that the overall control effect of the stabilizer is affected due to unreasonable pole configuration of a state variable observer when adopting the full-state feedback control is simultaneously avoided, and the good control effect is realized.

The invention discloses a power stabilizer of integrated wind power that is based on active voltage source direct current power transmission and belongs to the technical field of power network power stabilizer. The invention is a device that is used for stabilizing the power of integrated wind power and is based on active voltage source direct current power transmission, and the stabilizer comprises a rectifier, an inverter, an energy storage device, a DC bus and a controller. In steady-state operation, the voltage source direct current power transmission transmits wind power to power networks, and at the same time compensates the dynamic fluctuation of the wind power through the energy storage device that is connected in parallel on the voltage source DC bus, so that the power of the wind power that is input into the power networks through the voltage source direct current power transmission is stable. When the power networks are in fault, the active power and the reactive power that are input into the power networks are adjusted, and the steady operation performance of the power networks is enhanced. The device solves the problem that the dynamic fluctuation of wind power is influenced by input power networks, improves greatly the stabilization of integrated wind power and bears great significance in the energetic development of wind power generation.

The invention relates to a state space feedback controller operating in the digital domain for the regulation of the current supply to MRI gradient coils from a multiple-bridge PWM power amplifier. The Pl-controller comprises an integration part (for the integration of the difference between the demand current and the measured gradient coil current) and a subsequent P-controlled system which in turn comprises a delay compensator / stabilizer and a plant. The delay compensator / stabilizer comprises a multi-path feedback loop by means of which its digital output signal is fed back through delay blocks, on the one hand, and through filter units, on the other hand, whereby the filter units model the transfer functions of a gradient coil output filter for the gradient coil voltage and the output current of the amplifier inverter units, respectively. In the plant, a filter unit, which models the gradient coil transfer function, is connected in series to a delay chain for the delay of the measurement value of the gradient coil current.

The apparatus, of the field of electrical engineering, comprises a DC voltage source (DCVS), a DC-to-pulse voltage converter (DCPVC), a pulse-to-DC voltage converter (PDCVC), a DC stabilizer (DCS) and a control circuit (CC). The DCPVC is connected to the DCVC by its inputs and to the PDCVC by its outputs. A PDCVC output is connected to the DCPVC first control input and to a DCS first input, whose second input is connected to a DCVS positive output and whose first output is an apparatus output. A CC first input is connected to the PDCVC output, a CC second input is connected to a DCS second output, a CC first output is connected to a DCVS negative output, and a CC second output is connected to a DCPVC second control input.The result is the stabilization of dissipation power in the stabilizer.

The invention discloses a stability method for a power system and a stabilizer thereof. Filtering, eliminating direct current component, phase compensation and volt-limiting processing are carried out in sequence; wherein, the transfer function of the phase compensation is determined according to the following steps: 1 obtaining the phase characteristic Phi of a dynamo; 2. calculating the phase compensation characteristic Phi according to the engaged compensation requirement Phi<0> and the phase characteristic Phi; 3. taking the phase compensation characteristic Phi as a target curve to carry out curve fitting, obtaining a phase compensation curve f(x) which approaches the target curve and determining the transfer function of the phase compensation according to the phase compensation curve f(x). The stabilizer comprises a filter, a redactor a phase compensator and a volt-limiting device connected in sequence. The invention can well approach the needed compensation curve by adopting the transfer function of the phase compensation, thus carrying out better compensation for a lagging phase of the dynamo in the whole oscillation range with low frequency.

A ripple suppressor suppresses ripples of a channel current. The ripple suppressor comprises a voltage-controlled current source, a stabilizer, and an auto-calibration circuit. A control voltage at a control node controls the channel current flowing through a path connecting first and second channel nodes. The voltage-controlled current source receives a current-setting signal to generate the control voltage, so as to stabilize the channel current in response to the current-setting signal. The stabilizer at least provides low-pass filtering to generate and stabilize the current-setting signal in response to a first channel voltage at the first channel node. The auto-calibration circuit controls the stabilizer in response to the control voltage, so as to make the control voltage in compliance with a first predetermined condition.

An improved packaged liquid crystal display (LCD) assembly is described. A recess is used to house a support material while the LCD cell 609 is positioned at least partially within the containment structure. A plurality of spaced apart stabilizers are attached from the sides of the LCD cell 609 to the substrate without transmitting residual stresses induced during fabrication and operation. A support material is dispensed in the recess such that it provides support for the LCD cell 609 without transmitting residual stresses from the substrate. The described arrangements permit an LCD assembly which minimizes the amount of forces and stresses that lead to optical defects. The stabilizers, in addition to supporting the cell, also act to contain the encapsulating material used to protect the bonding wires. The support material, in addition to minimizing transmission of stresses, also provides improved heat dissipation from the LCD cell 609. In another embodiment, a method for constructing the LCD assembly is described.

A stabilizer for suppressing power oscillation of a flexible DC power transmission system is disclosed, and the stabilizer includes a compensation command generator and a converter station controller,the compensation command generator collects the active power signals from the frequency of the power network and the output of the flexible DC power transmission system, and forms the compensation signal of the active power command value, the compensation signal of the d-axis current command value and the compensation signal of the d-axis output voltage through the calculation and processing, andoutputs the three compensation signals to the converter station controller at the same time; the converter station controller collects the three-phase output current and three-phase terminal voltagesignals of the flexible DC power transmission system, combines the received active power command value compensation signal, d-axis current command value compensation signal and d-axis output voltage compensation signal, and generates the driving signal of the converter station through calculation and processing. Through the invention, the small-signal stability of the flexible DC power transmission system can be effectively enhanced.

The invention relates to a method and a device for testing the tensile strength of an axial lead of a glass shell diode, in particular to a method and a device for testing a glass shell diode, belonging to the technical field of electronic element testing and aiming at solving the problem that the controllability of tension and temperature change range can not be simultaneously satisfied in the tensile testing process of the glass shell diode in the prior art. The invention mainly comprises the device and the method for testing the tensile strength of the axial lead of the glass shell diode, wherein the device comprises a hot air source system, an axial lead tension application system and a forward voltage measuring system. The operations of tensile application and removal, current application, voltage measurement, and the like of the axial lead are carried out outside a high-temperature cabinet. A cabinet door of the high-temperature cabinet is unnecessary to be opened in the whole testing process of forward voltage drop of the diode under the tension and temperature control conditions, thereby ensuring the stability of the environmental temperature inside the cabinet, not influencing the environmental temperature (150 DEG C) of the diode and satisfying the requirements that the environmental temperature of the diode is within 150+ / -5 DEG C.

A light sense controller uses a light sensor to sense light variations, and then turns a socket on or off in response to the light levels for controlling household appliances coupled the socket. The light sense controller includes a plug and at least one socket. A step-down circuit couples to the plug for receiving AC power and outputting a supply voltage. A stabilizer couples to the step-down circuit for receiving the supply voltage, and outputs a first and second work voltage. A light sensor outputs a control signal in response to ambient brightness. A controller couples to the stabilizer and the light sensor for receiving the first work voltage and the control signal, and outputs a drive signal. An outputting circuit couples to the stabilizer, the controller, the plug, and the socket for receiving the second work voltage and the drive signal, and turns the socket on or off.

The invention discloses a voltage stability bifurcation analysis method for an AC / DC hybrid power distribution network. According to the method disclosed by the invention, the AC / DC hybrid power distribution network is equivalent to three portions; corresponding controllers are designed based on a differential algebra equation, wherein the controller comprises a voltage loop, a current loop and a stabilizer; voltage stability bifurcation analysis based on active power reference value variations is realized through setting system parameters and control parameters; a bifurcation inflection point and the limit power of voltage stability are determined based on an acquired bifurcation diagram, an optimal parameter of the stabilizer of the system is selected, a bandwidth value corresponding to the maximum stability margin of the system is found out, asymptotic stability analysis, static stability analysis, dynamic stability analysis and transient stability analysis of the system can be realized, a corresponding relation between the stabilizer parameter and the limit power of the system is acquired, feedback control signals of the stabilizer are set finally, and the system is controlled to operate in a range of the maximum stability margin.

A control signal generating circuit (1) comprises a comparator (10) for comparing an output voltage VO with a reference voltage outputted from a reference voltage source (11), a flip-flop (12) set by the output of the comparator (10), and a pulse control circuit (13) which receives an input voltage VIN, a reference voltage VREF2, and the inverted output of the flip-flop (12), sets the on time in accordance with the ratio between the input voltage VIN and the reference voltage VREF2, and resets the flip-flop (12) when the on time elapses after the output pulse of the flip-flop (12) rises. The output pulse of the flip-flop (12) is outputted as a control signal into a driver logic circuit (2). The driver logic circuit (2) performs on / off control of NMOSs (3, 4) according to the control signal. Thus, a switching regulator capable of operating at high speed can be realized.

A high-voltage discharge lamp lighting apparatus has a stabilizer 12 which supplies a power voltage used for maintaining the lighting operation to a high-voltage discharge lamp 20, and an ignitor circuit having an oscillating circuit-for-driving 13 in which a start pulse generates upon starting the lighting operation of the high-voltage discharge lamp, and high-voltage pulse generating transformers (14a, 14b, and 14c) which increase a voltage of the start pulse. Further, the high-voltage discharge lamp lighting apparatus includes a cap portion 16 to which the high-voltage discharge lamp 20 is attached and held, including a part of the high-voltage pulse generating transformers of the ignitor circuit, and a socket portion 11 to which the cap portion 16 is attached and is fit, including at least the oscillating circuit-for-driving 13 in the ignitor circuit and a portion of the high-voltage pulse generating transformers except for a part included in the cap portion 16. A primary coil 14a, a secondary coil 14b, and a magnetic coil 14c of the high-voltage pulse generating transformers are dividedly accommodated and arranged in the cap portion 16 and the socket portion 11. Thus, the continuous generation of a high voltage is prevented at connecting pieces of the portions upon detaching the cap portion 16 from the socket portion 11, the electric shock of an operator is prevented, and costs are reduced upon replacing the lamp.

The invention relates to a device for producing direct current passing into load power-supply circuits. The invention relates to the field of electrical engineering. The device comprises a DC voltage source, a DC voltage-to-pulsed voltage converter, a pulsed voltage-to-DC voltage converter, and a DC stabilizer. A first input of the DC stabilizer is connected to an output of the pulsed voltage-to-DC voltage converter, a second input of the DC stabilizer is connected to a positive output of the DC voltage source, and a first output of the DC stabilizer is connected to one of the load terminals. The other terminal of said load is connected to a negative output of the DC voltage source. The device also comprises a control circuit, wherein a first input of the control circuit is connected to the output of the pulsed voltage-to-DC voltage converter, a second input of the control circuit is connected to a second output of the DC stabilizer, a first output of the control circuit is connected to a second output of the DC voltage source, and a second output of the control circuit is connected to a second control input of the pulsed voltage-to-DC voltage converter. The result is the stabilization of dissipation power in the stabilizer.

The present subject matter relates to one or more devices, systems and / or methods for generating sealing current at a customer's premises or residence and injecting the sealing current into a DSL service provider's telephone cables to prevent the oxidation or corrosion of wire splices or connections on the telephone cables transporting DSL services. A cable pair stabilizer unit is connected at the customer's premises or residence, between the service provider's telephone cables and the customer's residential gateway / modem. The cable pair stabilizer unit comprises circuitry for generating the sealing current and for injecting the sealing current into the service provider's telephone cables transporting DSL services. The cable pair stabilizer unit may be combined with an AC / DC power supply adapter as a single, integrated device. The cable pair stabilizer unit may alternatively be combined with or inside of the Residential Gateway as a single, integrated device.

An embodiment of the invention discloses a voltage-to-current converter. The voltage to current converter includes a converter circuit having an input node, an amplified signal node and an output. The input node is configured to receive a sinusoidal voltage signal and the output is configured to provide a half-wave current signal. A transistor having a gate, a source, and a drain is coupled to the input node. The input node is coupled to one of the source or the drain. The amplified signal node is coupled to the gate. A process tracking stabilizer is coupled to the transistor at the source or the drain not coupled to the input node. The process tracking stabilizer is configured to generate a control voltage for the transistor. The control voltage is configured to maintain a predetermined non-zero voltage at the input node of the converter circuit during a negative cycle of the sinusoidal voltage signal. The embodiment of the invention further provides an RF transceiver.

The invention belongs to the technical field of quantum error correction codes and discloses a method applied to a quantum communication system and based on the generalized graph state of the Hadamardmatrix construction. The method comprises the steps of selecting an appropriate H matrix; determining a meaningful graph in a simple graph of four points as a research object; replacing the discreteFourier transform in a multi-element graph state by the H matrix; replacing a corresponding controlled gate by a controlled Z gate defined by the H matrix; for a specific graph, calculating the entanglement characteristic of the specific graph, and analyzing the relation between the equivalence of the H matrix and the equivalent performance of the local area of a corresponding graph state. According to the invention, based on a coding line instead of a stabistor-based mode-expanded graph state, the method is provided. Meanwhile, the entanglement characteristics and the relevant properties of the generalized graph state of some simple graphs are given. Therefore, non-volatile quantum codes can be constructed.

An electronic ballast device includes a stabilizer and a sweep frequency circuit for preheating. The stabilizer includes a first input terminal, a second input terminal and an output terminal connected to a fluorescent lamp. The sweep frequency circuit includes a boost element, an impedance element, a switch and a frequency selective circuit. The boost element includes a first end and a second end separately electrically connected to the first input terminal and the impedance element. The switch includes an input terminal electrically connected to the common contact point of the boost element and the impedance element, an output terminal and a reference voltage input terminal electrically connected to the common contact point of the boost element and the stabilizer. Furthermore, the frequency selective circuit is electrically connected to the output terminal of the switch, the first input terminal of the stabilizer and the second input terminal of the stabilizer.

An illumination control apparatus using a pulsating wave is disclosed, in which a pulsating power is supplied to an electric power supplied to a fluorescent light stabilizer which needs an AC voltage. The level of the same is varied and supplied to an illumination control, such as fluorescent light and common light, is possible based on an input power control of a stabilizer without changing an installation of a conventional fluorescent light and common light device and of the power construction. In addition, the electric power can be concurrently supplied to a plurality of stabilizers based on a capacity of apparatus without changing the construction of a conventional system.