Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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06 Jun 1988TL;DR: In this article, a power switch circuit is constructed for use in a motor vehicle using a high voltage semiconductor device on an electrically conductive substrate, where the low voltage devices operate from a regulated low voltage supply (12′,13′), which is regulated with reference to the high voltage supply voltage.
Abstract: Low voltage semiconductor devices (2′,3′) are integrated monolithially with a high voltage semiconductor device (1′) on an electrically conductive substrate. The substrate forms an electrode (4′ of the high voltage device (1′) and is connected in use to the high voltage terminal (5′) of a power supply. The low voltage devices (2′,3′) operate from a regulated low voltage supply (12′,13′), which is regulated with reference to the high voltage supply voltage, and not with reference to earth. This reduces the need to isolate the low voltage devices from the conductive substrate. An intelligent power switch circuit constructed in accordance with the invention is suitable for example for use in a motor vehicle.
64 citations
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28 Dec 1994TL;DR: In this article, an apparatus for controlling an output from an AC generator for a vehicle is provided which enables wiring from an external control unit (4) to a voltage regulator (3A) by using only one wiring line, and which is capable of adjusting an output voltage of the AC generator to a usual value in accordance with a duty ratio of a control signal supplied from the external controller unit, and linearly controlling the generator output voltage to a desired value in relation to a change in the level of the control signal.
Abstract: An apparatus for controlling an output from an AC generator for a vehicle is provided which enables wiring from an external control unit (4) to a voltage regulator (3A) by using only one wiring line, and which is capable of adjusting an output voltage of the AC generator (1) to a usual value in accordance with a duty ratio of a control signal supplied from the external control unit, and linearly controlling the generator output voltage to a desired value in relation to a change in the level of the control signal. The apparatus includes a control unit (4) connected to a battery (5) and a variety of sensors mounted on a vehicle for generating a control singal which has a duty ratio corresponding to a sensed operating condition of the vehicle; and a voltage regulator (3A) connected to the battery (5) and the control unit (4) for detecting an output voltage of the battery and controlling turning on and off of a field current supplied from the battery to a field coil (102) of the AC generator in accordance with the detected battery voltage so as to adjust an output voltage of the AC generator to a level that is determined in accordance with the duty ratio of the control signal from the external control unit.
64 citations
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27 Feb 2013
TL;DR: A power transmission system for transmitting electrical energy from a transmission antenna to a reception antenna via an electromagnetic field, including an inverter for converting DC voltage into AC voltage having a prescribed frequency and outputting the AC voltage, is described in this article.
Abstract: A power transmission system for transmitting electrical energy from a transmission antenna to a reception antenna via an electromagnetic field, including: an inverter for converting DC voltage into AC voltage having a prescribed frequency and outputting the AC voltage; a transmission-side control unit for performing a control for keeping the drive frequency of the inverter at a prescribed frequency, controlling the voltage of the DC voltage inputted into the inverter, and controlling to keep the power value outputted from the inverter constant; a transmission antenna into which the inverter inputs the AC voltage; a rectifier for rectifying the output from the reception antenna into DC voltage; a step-up/step-down unit for stepping up or down and then outputting the DC voltage from the rectifier; a battery charged by the output from the step-up/step-down unit; and a reception-side control unit for controlling the step-up/step-down unit and charging the battery most efficiently.
64 citations
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10 Mar 1999TL;DR: In this article, a voltage balancer device is used to eliminate voltage unevenness among the cells in a group of rechargeable unit cells connected in series forming a combination battery, each group including several cells, preferably three to five cells.
Abstract: A large number of rechargeable unit cells connected in series forming a combination battery are divided into groups of cells, each group including several cells, preferably, three to five cells. Voltage unevenness among the cells in each group is eliminated by operation of a voltage balancer device connected to each group of cells. The voltage balancer device includes a circuit for equally dividing a terminal voltage of the group of cells and obtaining an average voltage among the cells. The average voltage is compared with an individual cell voltage, and the cells having a voltage higher than the average voltage are discharged so that all cell voltages in the group become equal. A plurality of the battery modules each including the group of cells and the voltage balancer device are connected in series to form a single combination battery, and voltage unevenness among the battery modules are controlled by another voltage control device. The voltage unevenness among cells in a group may be eliminated by charging a capacitor from cells having a higher voltage and charging cells having a lower voltage from the charged capacitor. Thus, the voltage unevenness among the combination battery cells is eliminated by a simple and inexpensive device.
64 citations
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TL;DR: In this paper, three different voltage control options during unbalanced grid faults were compared in simulations of a wind power plant connected to a meshed power system, including synchronous generators.
Abstract: The fully rated converter of type 4 wind turbines is capable of providing dynamic voltage control during grid faults by injecting controlled reactive currents. This paper describes three different dynamic voltage control options during unbalanced grid faults: 1) the positive sequence voltage control with only a positive sequence reactive current injection and suppression of the negative sequence current; 2) the positive sequence voltage control with limitation of the positive sequence reactive current injection and suppression of the negative sequence current; and 3) the positive and negative sequence voltage control with both a positive and a negative sequence reactive current injection. These different control options are compared in simulations of a wind power plant connected to a meshed power system, including synchronous generators. It is shown that both the positive sequence voltage control with limitation and the positive and negative sequence voltage control can overcome the voltage rise and voltage distortion that can occur with pure positive sequence voltage control without limitation. Both of these options have a distinct fault response, where the positive and negative sequence voltage control results in a fault response that resembles the fault response of a synchronous generator with higher fault current contributions in the faulted phases.
64 citations