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In the conventional variable speed drive, the dc-link including the dc-choke and electrolytic capacitor is bulky with limited lifetime. The slim dc-link drive is thus proposed for the lower cost and longer lifetime by using the film capacitor to replace the electrolytic capacitor and dc-choke. However, such drive system suffers from the potential instability issue, due to the negative incremental...
This paper presents a current feedback buffer based output capacitorless low-dropout (OCL-LDO) regulator. By incorporating the weighted current feedback (WCF) circuit technique in a simplified buffer-based regulator architectural design, it can provide a fast response with efficient transient figure-of-merit (FOM) for wide current (IL) and capacitive (CL) load range. Validated in a UMC 65-nm CMOS...
Low Voltage DC (LVDC) distribution systems are new promising technologies which can potentially improve the efficiency and controllability of existing LV distribution networks. However, they do introduce new challenges under different fault conditions. Therefore, this paper investigates the performances of an active LVDC distribution network with local solar photovoltaics (PVs) and energy storages...
Pulse Width Modulated AC drives equipped with small DC-link capacitor are becoming an attractive solution for electric drive applications with moderate requirements for shaft dynamic performance. However, when these drives are fed from a weak grid a resonance between the line side impedance and the DC-link capacitor appears. Due to this resonance, the THD and the partially weighted harmonic distortion...
Small DC-link drive system, built with film capacitor in the DC link, may have the advantages of longer lifetime and the possibility to achieve a more compact design of capacitor bank at medium and high power rates. However, it exhibits instability problem, especially when it is fed by a soft grid. Therefore, active damping techniques are usually needed in order to stabilize the system. This paper...
With scaling down of semiconductor devices, gate oxide degradation has been a reliability problem. So, emission microscope was developed to be applied in damaged gate oxide analysis in recent 20 years. We usually occurred some fail capacitor and resistor cases in FA (Failure Analysis). But in FA field no any paper summarized analysis of damaged capacitor and resistor with EMMI (Emission Microscope)...
In this paper, a practical analog implementation of capacitor charge balance controller is presented, which is capable of achieving the optimal response for dc-dc Buck converters without relying on the knowledge of the nominal passive component (output inductor and capacitor) value. This ready-for-integration analog controller applies the output voltage curve analysis for deriving the formulas to...
Dc-dc Buck converter has a major application for powering integrated circuit under stringent regulation, nowadays. In this paper, a practical digital control algorithm is presented to achieve the optimal response for dc-dc Buck converters without relying on the knowledge of the passive component value (inductance and capacitance). This algorithm introduces the curve fitting analysis for deriving the...
A new driving method for SR is presented. By applying a zero-crossing noise filter to the MOSFET, the false-triggering of the SR can be effectively eliminated. Moreover, the resistor and the capacitor in the filter can be used as a compensator to solve the duty cycle loss issue caused by the trace inductance of the MOSFET package. Only three passive components are needed in the proposed filter which...
Recently, optimal control on Buck converter for powering the latest computer central processor units (CPUs) has attracted more and more attention. In this paper, a novel digital control algorithm is presented to achieve the time-optimal response for dc-dc Buck converters without relying on any knowledge of converter design parameters such as output inductance, capacitance and even ESR value. This...
De-icing schemes and operations for overhead power line in 10kV, 66kV and 220kV networks based on shunt capacitor over-compensation method are proposed in this paper. This novel de-icing method is based on characteristics of sinusoidal AC and theory of shunt capacitor over-compensation. By utilizing 10kV capacitor bank, which is installed as standard apparatus in substation, reactive current can be...
In this paper, a digital charge balance controller is presented which is capable of controlling a Buck converter and an auxiliary circuit to achieve an excellent unloading transient response. The auxiliary circuit significantly reduces the voltage overshoot caused by an unloading transient while the digital charge balance controller reduces the settling time of the converter. The controller is capable...
The transmission line de-icing method based on adjusting electric load is studied by using controllable inductor and capacitor compensation, in order to reduce and avoid the impact of the freezing rain and ice disaster. The technical and economic feasibilities of various ice-melting methods are briefly compared and analyzed between inductor-adjusting-load, short-circuit and over-current. The theoretical...
A new type of high step-up, high efficiency interleaved boost converter is proposed in this paper. Coupled-inductors are used in this topology to extend the duty cycle. Therefore, the low-voltage rated and low resistance devices can be applied to minimize the conduction which makes the conduction losses significantly reduced. ZCS turn-on is achieved by the intrinsic leakage inductance of the coupled...
This paper introduces a novel interleaved boost converter. By applying winding coupled inductors and switched capacitors in the output stage, the voltage gain of this topology is significantly increased and the voltage stress of the switch is greatly reduced so that the low conduction resistance and low voltage rated switches can be applied. Because of part of the output energy storing in the switched...
An interleaved and isolated boost converter with switched capacitors is proposed in this paper. The switched capacitors are used to realize the inherent voltage-lift function which increases the voltage gain and reduces the turns ratio of the transformers greatly. Because the transformers can operate in flyback and forward modes which make part of the output energy stored in the switched capacitors,...
An interleaved boost converter with coupled inductors and switched capacitors is proposed in this paper. The switched capacitors are used to realize the inherent voltage-double function which increases the voltage gain and reduces the voltage stress of the switch greatly so that the low conduction resistance and low voltage rated switches can be applied. Moreover, according to capacitor charge balance,...
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