Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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17 Oct 2013
TL;DR: A simple Vce online monitoring circuit that allows an accurate wear out prediction of IGBT modules, in high-power applications, during normal converter operation and bipolar measurement allows monitoring of both IGBT and antiparallel diode.
Abstract: A simple Vce online monitoring circuit is presented in this paper. It allows an accurate wear out prediction of IGBT modules, in high-power applications, during normal converter operation. Bipolar measurement allows monitoring of both IGBT and antiparallel diode. The circuit uses two serial connected diodes to sense the Vce voltage with millivolt accuracy. One diode acts as a protection to block high DC voltage present on input terminals. When the device is conducting the voltage on the second diode is measured to compensate for the voltage drop on the protection diode thus eliminating voltage offset due to diodes' forward voltage temperature dependency. Using four diodes one can monitor voltages on all power devices in a converter leg.
132 citations
TL;DR: In this article, a novel topology named multiphase coupled-buck converter is proposed, which enables the use of a large duty cycle with recovered leakage energy and clamped MOSFET voltage.
Abstract: The most popular VRM topology-multiphase buck converter operates at a very small duty cycle due to a high input voltage and a low output voltage. The performance of the multiphase buck converter suffers from the very small duty cycle. Alternative topologies with an extended duty cycle are explored in order to improve the efficiency without compromising the transient response. A novel topology named multiphase coupled-buck converter is proposed, which enables the use of a large duty cycle with recovered leakage energy and clamped MOSFET voltage. The input filter is further integrated in the proposed circuit to reduce the number of components. A 12 V-to-1.5 V/50 A VRM prototype demonstrates that the multiphase coupled buck converter can have a much better efficiency than the multiphase buck converter with the same transient response.
131 citations
01 Jan 1978
TL;DR: In this paper, a state-space averaging method for modeling switching dc-to-dc converters for both continuous and discontinuous conduction mode is developed, and the results for these converters are then easily tabulated owing to the fixed equivalent circuit topology of their canonical circuit model.
Abstract: A state-space averaging method for modelling switching dc-to-dc converters for both continuous and discontinuous conduction mode is developed. In each case the starting point is the unified state-space representation, and the end result is a complete linear circuit model, for each conduction mode, which correctly represents all essential features, namely, the input, output, and transfer properties (static dc as well as dynamic ac small-signal). While the method is generally applicable to any switching converter, it is extensively illustrated for the three common power stages (buck, boost, and buck-boost). The results for these converters are then easily tabulated owing to the fixed equivalent circuit topology of their canonical circuit model. The insights that emerge from the general state-space modelling approach lead to the design of new converter topologies through the study of generic properties of the cascade connection of basic buck and boost converters.
131 citations
TL;DR: In this article, a general description of the characteristics of these new automatic control apparatuses and of the interventions required on existing equipment for their installation, activation and operation is presented.
Abstract: The hierarchical voltage control system, currently fully exploited in the Italian transmission grid and presented in Part I, improves voltage quality, network security and operation efficiency. This coordinated automatic system, operated by the Italian ISO (GRTN), is subdivided into three hierarchical control levels, requiring unconventional regulation apparatuses. They are the Voltage and Reactive Power Regulator (REPORT) at the power plant level, the Regional Voltage Regulator (RVR) at the regional dispatcher level, and the National Voltage Regulator (NVR) at the ISO control center. This survey paper provides a general description of the characteristics of these new automatic control apparatuses and of the interventions required on existing equipment for their installation, activation and operation. A brief presentation of the main dynamic performance of the hierarchical control system, from the inner to the outer control loops, is also given with reference to laboratory, commissioning and field tests.
130 citations
Patent•
30 Mar 2001
TL;DR: In this paper, a power factor correction circuit is proposed for rectified alternating-current (AC) input signals across inputs of a voltage converter circuit, such as a boost converter, where the current drawn by the voltage converter may be sensed to form a first sensing signal that is representative of the current.
Abstract: A power factor correction circuit arrangement. A rectified alternating-current (AC) input signal may be applied across inputs of a voltage converter circuit, such as a boost converter. Current drawn by the voltage converter may be sensed to form a first sensing signal that is representative of the current. The rectified input voltage may be converted to a second sensing signal that is representative of the AC input signal. Switching in the power converter is adjusted in a first feedback loop to equalize the first and second sensing signals and, thus, the current drawn is regulated to remain in phase with the AC input signal. A feedback signal adjusts switching so as to regulate the output voltage level of the voltage converter in a second feedback loop and, thus, controls power delivered to the load.
130 citations