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L21a_4345_Sp02

... In case of Resistively loaded case ,changes in the common Mode input will cause changes in the bias current IEE because of the finite output resistance of the biasing current source.This will cause a change in Ic2 and an identical change in Ic1. Because of the active load ,the change in Ic1 will p ...
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... Fax: (49) 89 45 49 49 49 [email protected] ...
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... frequencies thereby reducing switching losses. Further, the leakage current is reduced because of the lower dv=dt. The H-bridge multilevel inverter presented in literature has been implemented successfully in industrial applications for high power drives. However, the drawback is that these inverter ...
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... has been estimated by regulating the dc side capacitor voltage. This method is simple and easy to implement but compensate both harmonics and reactive power simultaneously, which is not preferred sometimes due to increased rating of APF [2]. The size and cost of APF depends on how much harmonics are ...
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... Low Power CMOS Dual Operational Amplifier General Description The LPC662 CMOS Dual operational amplifier is ideal for operation from a single supply. It features a wide range of operating voltage from +5V to +15V, rail-to-rail output swing in addition to an input common-mode range that includes grou ...
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... The voltage source inverter (VSI) is one of the most used circuit configurations for speed control of three-phase induction motors. The main objective of inverter is to produce an ac output waveform from a dc power supply. A fixed dc input voltage is given to the inverter and a controlled ac output ...
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Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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