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Aalborg Universitet Space (HSS) Method
Aalborg Universitet Space (HSS) Method

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Aalborg Universitet compensation in an islanded AC microgrid

OPA353 OPA2353 OPA4353 High-Speed, Single-Supply, Rail-to-Rail
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... OPA353 series extends 100mV beyond the supply rails. This is achieved with a complementary input stage—an N-channel input differential pair in parallel with a P-channel differential pair (see Figure 2). The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 1.8V ...
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... The operation of p-type transistors in the pull-up network is controlled by an internal feedback mechanism. This is not directly operated by the low voltage swing input signal. Therefore it avoids the formation of static dc current paths within the circuit. Due to the slow response of the internal f ...
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... The voltage rise times and fall times for the high voltage pulse must be fast enough to obtain maximum width state while attaining the 1.0 µs flat top. In any case, the pulse width at 75 % must not be more than 3.5 µs. The voltage must be tuneable between 50 and 100 % of the maximum voltage. ...
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Making Sense of Current Sensing

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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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