Voltage regulator

About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.

Study on the Influence of Supply-Voltage Fluctuation on Shunt Active Power Filter

Abstract: Is there any influence of supply-voltage fluctuation on the shunt active power filter? Few papers have discussed this problem. In this paper, based on the instantaneous power balance of shunt active power filter ac-side and dc-side, a small-signal model of dc-link voltage control is derived. According to this small-signal model, the influence of supply-voltage fluctuation on the dc-link voltage of shunt active power filter is analyzed in detail. The conclusion is that the supply-voltage fluctuation has influence on the dc-link voltage of shunt active power filter. Then a feedforward control method of supply-voltage and compensation current is proposed to eliminate the influence. The proposed feedforward control method can be easily implemented in practical. In this paper, the influence of supply-voltage fluctuation on compensation performance of shunt active power filter is also analyzed when the dc-link voltage is constant. From the analysis, it can be concluded that current controller with PI regulator has better performance to suppress the influence of the supply-voltage fluctuation. Finally, the experimental results are given to demonstrate the conclusions.

Constant on-time architecture for switching regulators

Abstract: A switching voltage regulator whose switching frequency decreases with reduced load currents is disclosed. The switching voltage regulator includes a current-controlled oscillator that varies the frequency of switching by changing the off-time of the switch and maintaining a constant on-time. The lower frequency as a result of the constant on-time switching reduces switching loss and power consumption at lower load currents. The constant on-time architecture of the present invention significantly improves the overall efficiency of the switching voltage regulator, while reducing component count and die size.

Distributed generation location and capacity effect on voltage stability of distribution networks

Abstract: Analysis of the effect of distributed generation (DG) capacity and location on voltage stability enhancement of distribution networks is presented in this paper. The analysis is performed using a steady state voltage stability index which can be evaluated at each node of the distribution system. Different optimal capacities and locations are used to check this effect. The location of DG has the main effect on the system voltage stability. Voltage stability should be taken into account as one of the objectives of DG optimal allocation techniques. The analysis is conducted on a 69 node distribution system.

A new on-chip converter for submicrometer high-density DRAMs

Abstract: The converter described is a feedback-type voltage regulator which supplies a reduced voltage to an entire RAM circuit. A novel timing activation method was introduced to save power. The converter has been implemented on an experimental 4-Mb dynamic RAM. It was found that an even faster access time and higher reliability compared to a conventional design could be achieved by using an on-chip voltage converter and shorter channel transistors. This voltage converter is suitable for high-density, high-speed, and high-reliability DRAMs with submicrometer transistors.