Topic
Switched-mode power supply
About: Switched-mode power supply is a research topic. Over the lifetime, 44760 publications have been published within this topic receiving 547258 citations. The topic is also known as: switching-mode power supply & SMPS.
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Patent•
29 Sep 2006
TL;DR: In this article, a power tool motor is provided by pulse width modulation of current from a power supply, which may be varied according to the determined motor current and measured power supply voltage.
Abstract: Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply may include a battery such as lithium ion or nickel cadmium.
660 citations
TL;DR: A review of the most interesting solutions for single phase and low power applications is carried out in this article, where the major advantages and disadvantages are highlighted and the field of application is found.
Abstract: New recommendations and future standards have increased the interest in power factor correction circuits. There are multiple solutions in which line current is sinusoidal. In addition, a great number of circuits have been proposed with nonsinusoidal line current. In this paper, a review of the most interesting solutions for single phase and low power applications is carried out. They are classified attending to the line current waveform, energy processing, number of switches, control loops, etc. The major advantages and disadvantages are highlighted and the field of application is found.
652 citations
Patent•
09 Dec 1981
TL;DR: In this paper, a DC-to-DC voltage converter is described for converting the voltage from a battery to provide a power supply voltage whose value can be equal to the battery voltage multiplied by or divided by a non-integral factor, e.g. 2/3.
Abstract: A DC-to-DC voltage converter is disclosed for converting the voltage from a battery to provide a power supply voltage whose value can be equal to the battery voltage multiplied by or divided by a non-integral factor, e.g. 2/3. The converter operates on the principle of capacitor charge switching, and high conversion efficiency is achieved in operation at very low levels of supply current, such as are utilized in an electronic timepiece.
650 citations
Patent•
30 Jun 2003
TL;DR: In this paper, a system for providing power to a wireless card includes power interface that provides power to compact flash card and a boost regulator that boosts the power from the power interface.
Abstract: A system for providing power to a wireless card includes power interface that provides power to a compact flash card. A boost regulator boosts the power from the power interface. A battery provides power that is summed with the power from the power interface. Moreover, a buck regulator limits the voltage of the summed power. A compact flash card can be powered by the power interface while a wireless card can be powered by the summed power.
638 citations
TL;DR: In this paper, the authors investigated the effect of reducing the supply and threshold voltage on the energy efficiency of CMOS circuits and showed that when the transistors are velocity saturated and the nodes have a high activity factor, this simple analysis suggests optimal energy efficiency at supply voltages under 0.5 V.
Abstract: This paper investigates the effect of lowering the supply and threshold voltages on the energy efficiency of CMOS circuits. Using a first-order model of the energy and delay of a CMOS circuit, we show that lowering the supply and threshold voltage is generally advantageous, especially when the transistors are velocity saturated and the nodes have a high activity factor, In fact, for modern submicron technologies, this simple analysis suggests optimal energy efficiency at supply voltages under 0.5 V. Other process and circuit parameters have almost no effect on this optimal operating point. If there is some uncertainty in the value of the threshold or supply voltage, however, the power advantage of this very low voltage operation diminishes. Therefore, unless active feedback is used to control the uncertainty, in the future the supply and threshold voltage will not decrease drastically, but rather will continue to scale down to maintain constant electric fields.
634 citations