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Active Power Factor Correctors (PFCs) are needed to design ac-dc power supplies with universal input voltage range and sinusoidal input current. The classical method to control PFCs consists in two feedback loops and an analog multiplier. Hence, the input current is sinusoidal and it is in phase with the input voltage. However, a bulk capacitor is needed to balance the input power and the output power...
Passive standby and line-interactive uninterruptible power supplies (UPSs) have lower cost and size than double conversion UPS and their efficiency is higher. On the other hand, their voltage regulation is poor (or non-existent) during the normal mode of operation. Moreover, both UPSs have a transfer time (also defined as switching time) from normal mode to stored energy mode when the utility power...
When a power system needs power factor correction and fast output voltage regulation, two main possibilities arise: to use two converters connected in cascade or to use a single converter performing both things. In the first case, each converter performs a different function; the first one corrects the power factor and the second one provides fast output voltage regulation. With this option, the total...
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