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A 3 MHz, 48W Boost converter with high speed and high accuracy Peak Current Control Unit (PCCU) is presented. The Boost controller IC adopts a novel PCCU consisting of a fully differential open-loop operational transconductance amplifier (OTA) and a trans-impedance amplifier (TIA), which can minimize the delay and error of the whole control loop. In the PCCU, the compensated output of error amplifier...
With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In...
12kV vacuum circuit breaker(VCB) is widely used in distribution system. It is important to research its state and analyze its performance changes. In this paper, several 12kV VCBs which had been in service for several years were investigated. Mechanical operate experiment was carried out on them, mechanical parameters were recorded. It was found that 7.7 percent of VCBs' closing speed was higher than...
DC current is an important parameter for the three-phase voltage source converter (VSC). It determines the thermal and reliability status of DC-link capacitor or battery. Analysis and prediction of DC current is associated with three-phase AC current and its ripple, together with the pulse-width-modulation (PWM) method. Based on the AC current ripple prediction method, this paper gives a general DC...
The loss contribution of a 2.3 kW synchronous GaN-HEMT boost converter for an input voltage of 250 V and an output voltage of 500 V was analyzed. A simulation model which consists of two parts is introduced. First, a physics-based model is used to determine the switching losses. Then, a system simulation is applied to calculate the losses of the specific elements. This approach allows a fast and accurate...
This paper presents a comparison between conventional base driver concepts for bipolar silicon carbide transistors and an approach based on utilizing a buck-converter-IC to drive the bipolar transistor. The different concepts are simulated and compared with respect to switching performances and driving losses. The results are validated by corresponding measurements.
The simulation of current source modular multilevel converter (CSMMC) based systems with large number of submodules require significant computational efforts. In this paper, a simplified model of CSMMC is developed to reduce the computational complexity while maintaining the accuracy of the traditional detailed model. The model is constituted using controlled current sources in each arm of the converter...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
This paper investigates the switching performance of six-pack SiC MOSFET and Si IGBT modules for motor drive applications. Both the modules have same packaging and voltage rating (1.2 kV). The three bridge legs of the modules are paralleled forming a single half-bridge configuration for achieving higher output power. Turn-on and turn-off switching energy losses are measured using a standard double...
An atomic Monte-Carlo simulator of Conductive Bridge Random Access Memory (CBRAM) is developed to investigate the microscopic properties of filament growth and dissolution during Forming/SET and RESET processes. The cluster growth during nucleation correlated with electrochemical reactions and cations transportation are included. The impacts of the critical material parameters on the geometry of conductive...
Traditional power electronics classes utilise analytical calculations, numerical simulations and ready to run hardware for laboratory measurements. This complicates the understanding of e.g. parasitic circuit elements. To circumvent above restrictions a concept allowing students to understand, simulate and build their own DC/DC-converters including all steps from soldering to programming is presented.
Renewable energy sources such as wind and solar energy sources are unreliable in different weather conditions to provide constant output voltage. So the concurrent use of different input sources is inevitable to provide a constant load. The use of a Multi-Input Converters (MICs) instead of several separate converters can reduce the number of passive elements. Also it can save the cost and reduce the...
This paper presents some real properties of the cross-coupled charge pump that is used in low-power microelectronic integrated systems operating with high voltage (FLASH, EEPROM memories). SC-circuits characterization and design aspects are firstly discussed. Theoretical analysis of the cross-coupled charge pump with accompanying equations has been done. Some real properties have been simulated by...
A new galvanically isolated DC-DC converter has been presented in this paper. The proposed topology is based on the quasi-switched-boost impedance network. It not only includes all positive characteristics of previous converters including continuous input current, high boost ability and high efficiency, but also has the prominent features of less passive elements utilization, small size and light...
This paper presents high-power-density inverter with pulse current injection power decoupling method. In order to reduce the dc-link capacitor significantly, dc-link current is fully analyzed with double Fourier method in theory. Compared with the traditional 2nd harmonic power decoupling method, the pulse current injection method considers not only 2nd order harmonic but also the higher order harmonics...
A low power switching method for SAR ADC is proposed in this paper. With this switching method the comparator first compares the sampled input voltage with Vref/2 to generate the MSB and determine whether to use Vref/2 or Vref as the comparator reference voltage in the following conversation steps, and the DAC with a split capacitor array uses Vref/2 as the reference voltage to generate the remaining...
A switched line microwave digital phase shifter and a hybrid coupler phase shifter using PIN diodes which are operated at center frequencies from 14GHz to 14.5GHz are presented. The former is able to realize 180 degree phase shift and the latter is able to realize 11.25 degree phase shift. The phase shifters are designed to implement on a microstrip circuit type. Both of the two phase shifters can...
In this paper, a Ku band seven bit microwave digital phase shifter using PIN diodes is designed based on simulation software ADS(Advanced Design Simulation). The circuit consists of four bits realized by hybrid coupler phase shifters and three bits realized by switched line phase shifters. All of seven bits take proper measures to obtain flat phase shift. The phase shifter is designed to implement...
Recent advancements in shipboard power system have focused on Medium Voltage DC Distribution System in Navy Ships. This system requires the use of high input to output voltage DC-DC converters to act as buffer between the MVDC bus and the load centers within the ship. The load lines to these converters which often involve other DC-DC converters and inverters, will be powering complex machinery and...
Zero-Voltage and Zero-Current-Switching (ZVZCS) phase-shifted full-bridge (PS FB) pulse-width-modulated (PWM) converter, which can achieve Zero-Voltage-Switching (ZVS) of the leading leg and the Zero-Current-Switching (ZCS) of the lagging leg in a wide load range. It has the advantages of simple structure, less duty cycle loss and easy to implement soft switch and so on. In this paper, the working...
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