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This paper analyzes Henan power circuit breakers with closing resistors operation. Selecting a typical substation as the research object, switching overvoltage and surge arrester energy absorption were simulated without the closing resistor. Measured through the field test verified the accuracy of the simulation. The relations between line length and over-voltage level was also analyzed. The result...
The paper discusses load compensation using a distribution Static Synchronous compensator (DSTATCOM). DSTATCOM is capable of supplying ac and dc loads in 3-phase 4-wire distribution systems. In this we utilize the method of instantaneous symmetrical components to extract the compensator reference currents. The operation of the compensator has been verified through (MATLAB) simulation and detailed...
This paper presents a low-power down-conversion mixer for 3.1~4.8 GHz MB-OFDM UWB applications. The proposed mixer is based on folded double-balanced Gilbert cell and employs following techniques: two cross-coupling capacitors at the transconductance stage enhance conversion gain and reduce input noise; two choke inductors reduce flicker noise from the switch quad; tuning capacitors and resistors...
This paper presents a DC-30 GHz single-pole-four-throw (SP4T) CMOS switch using 0.13 mum CMOS process. The CMOS transistor layout is done to minimize the substrate network resistance. The on-chip matching inductors and routing are designed for a very small die area (250times180 mum2), and modeled using full-wave EM simulations. The SP4T CMOS switch result in an insertion loss of 1.8 dB and 2.7 dB...
Voltage regulation in system-on-chip has turned into a very critical challenge for nanoscale IC designers. It is imperative that for multi-core implementation on-chip voltage regulator offers enormous benefits. This paper discusses the advantages and disadvantages of using on-chip regulators as well as their functional operation. Furthermore, it introduces the technique of using a hot swap controller...
Two wideband LC VCOs, customized for IEEE 802.15.4a applications, are presented in this paper. Both circuits have been designed and implemented in a 90-nm CMOS technology. The first VCO has been designed for the 3.1-5 GHz UWB band. It exhibits a tuning range of 40% from 3.2 GHz to 4.8 GHz with a tuning voltage of 1.2 V. The measured phase noise at 1-MHz offset from a 4-GHz carrier is -114 dBc/Hz....
Through analyzing the typical systempsilas characteristic and Ultra-High Voltage(UHV) ac transmission linepsilas characteristic, the strategy by controllable shunt reactor is presented to improve transmission quality in electric networks in this paper. By using MATLAB PSB, simulation model of UHV ac transmission line from Jindongnan to Jingmen was built to study control effects on frequency over voltage,...
A two-stage electronic ballast for metal halide (MH) lamps is presented in this paper. The front-stage is a two-output power factor correction AC-DC flyback converter. The post-stage is a half-bridge inverter, which is used to control lamp power and drives MH lamp with a low-frequency square waveform current to avoid acoustic resonance. In addition, the lamp power of steady state is maintained at...
This paper introduces a new soft switching current-fed DC-DC power converter. A clamp circuit in this converter provides soft switching condition for all switches and absorbs the voltage spikes of main switches at turn off instance. This converter contains four switches, two main switches and two auxiliary switches. Since all switches operate under soft switching condition, this converter can operate...
An improved three-phase single-stage isolated power factor correction (PFC) converter topology is studied in this paper. The converter is based on full-bridge structure and operates in constant-frequency discontinuous conduction mode (DCM). Through the analysis on the working principle and mechanism of voltage spike of the original topology, a voltage-clamping circuit is proposed and added in primary...
A three-phase single-stage full-bridge power factor correction converter is presented in this paper. The converter could achieve power factor correction and AC/DC power conversion in one stage circuit. It could achieve electrical isolation between input and output sides. The voltage stress of each switch is reduced due to the adopting of the active clamp circuit. By using soft-switching techniques,...
This paper presents a new soft switching bidirectional buck or boost DC-DC converter. Compared to the traditional bidirectional DC-DC converter, the new topology can be used as a buck converter or a boost converter in bidirectional cases for Hybrid Electric Vehicles (HEV) and Electrosorb Technology (EST) etc. This new converter has the advantages of simple circuit and control strategy, soft-switching...
This paper presents the analysis and loss evaluation of the hard-switching and soft-switching inverters in the three-phase uninterrupted power supply (UPS). Both two-level and three-level hard-switching inverters and the chosen soft-switching inverters are designed to evaluate the loss and the efficiency. Tests of the influence of IGBT collector-emitter paralleled capacitor on IGBT turn-off loss through...
Using the state-space average modeling method, a nonlinear affine model of Boost converter working on current conduction mode (CCM) is set up. Based on the input-output linearization method of differential geometry theory, the internal dynamics of the systems, with output represented by the input inductor current and the capacitor voltage respectively, are been studied. It is pointed out that the...
For inverter-based photovoltaic(PV) systems in grid-connected applications as distributed generators(DG), variable sources often cause wide changes in the inverter input voltage above and below the output voltage, thus demanding a buck-boost operation of inverters. Many traditional full-bridge buck inverters, two-stage inverters, single-stage buck-boost inverters either have complex structure or have...
This paper proposes an input-paralleled output-paralleled half-bridge converter based on single half-bridge converter, which is very suitable for the low output voltage and large output current application. All modules share a common capacitor-leg, that can reduce the number of main circuitpsilas capacitors and make topology simple. The traits and rules of combination converter are introduced and...
Previous publications revealed that system stability was degraded due to the delay of computational time and the conversion time of A/D converter. It could induce system oscillation and even system stability could be destroyed. Predictive results of conventional current state observer were not ideal because that it was open loop in essence. To alleviate this problem, a method based on new state observer...
Based on control type soft switching, an interleaved three-phase bidirectional DC/DC converter for high voltage high power applications is presented. The converter main circuit uses the interleaved three-phase bidirectional DC/DC topology and takes use of the three-phase complementary PWM control to implement soft switching condition. The circuit principles, the working modes and control type soft...
In order to solve the problem that the existing rubber-tyred gantry (RTG) crane consumes massive generating/braking energy through resistance, produces plenty of heat, causes excessive fuel consumption and exhaust emission during working, the relation of energy flows of the existing system is analyzed and the value of the improvement of energy-saving is confirmed in the paper. The constitution and...
The design principles, construction, and performance of a ten-foot whip antenna for use with radio communication sets covering the frequency range from 30 to 76 MHz are described. The antenna is insensitive to changes in environment, with respect to electrical performance. It has uniform azimuthal distribution of radiation, optimum gain at the horizon, and is suited as an element of antenna arrays...
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