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... drives use power switching techniques and generate hig h rates of change of voltage. Most modern a.c. drives use voltage-source PWM inverters with very fast-switching power semiconductor devices such as Insulated Gate Bipolar Transistors (IGBT), which are now the industry standard because of their r ...
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... In this section, to demonstrate the improvement on power efficiency, we used TSMC 5V-0.35-um CMOS technology to implement three cases of PWM class-D amplifiers including (I) applying proposed method, (II) conventional optimization for maximum power delivery D ¼ 0:9 and (III) optimization for a range ...
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... breakers, points of use, and even individual equipment. This coordinated approach is supported by the Emerald Book (IEEE Std. 1100-2005), a definitive reference published by the Institute of Electrical and Electronics Engineers (IEEE). This standard states “It is recommended that additional [SPDs] b ...
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Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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