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MT-060 TUTORIAL  Choosing Between Voltage Feedback (VFB)
MT-060 TUTORIAL Choosing Between Voltage Feedback (VFB)

... The input impedance of the inverting and non-inverting inputs of CFB op amps are not equal, and CFB op amps generally have unequal and uncorrelated input bias currents because the (+) and (–) inputs have completely different architectures. For this reason, external bias current cancellation schemes ...
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... The three cases to consider are  Case 1. All sources are independent  Case 2. The circuit has dependent sources and independent sources  Case 3. The circuit has only dependent sources Depending on the case, one or more of the following methods can be used to find the Thevenin equivalent: Direct R ...
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... power factor to 0.90 lagging. This input filter shall be programmable to automatically disconnect from the input source at reduced load levels or when signaled from the UPS controller for coordination with engine-generator operation. This input filter will be located inside the main UPS enclosure an ...
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Two - Schneider Electric

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FL ballasts Electronic dimming PCA T5 EXCEL one4all lp Y, 3x14

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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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