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An isolated dc-dc series-resonant converter that is controlled by a combination of variable-frequency and secondary-side-switch delay-time control is employed as the output stage of the on-board charger module (OBCM) that operates with a wide battery-voltage range. The delay-time control which is implemented by the modulation of secondary-side switches is used to assist the conventional variable-switching-frequency...
The voltage source driver is widely used in a conventional drive circuit of PFC converter, where the fixed parameters of drive circuit couldn't optimize the switching loss of power switches. In view of this problem, one adaptive turn-off method of power switch for PFC converter is proposed, in which the turn-off current could be regulated adaptively with the input voltage changed periodically. The...
High efficiency and compact single phase inverters are desirable in many applications such as solar energy harvesting and household appliances. This paper presents a 2 kW, 60 Hz, 450 VDC to 240 VRMS power inverter, designed and tested subject to the specifications of the Google/IEEE Little Box Challenge. The inverter features a 7-level flying capacitor multilevel converter, with low-voltage GaN switches...
A conventional Flyback converter's synchronous rectification switch is controlled from the primary side via opto-isolators; introducing propagation delay. A new control concept is presented here that eliminates the need for opto-isolators, communicating instead through the coupled inductor to assist more precise soft-switching control at much higher frequencies. As a precursor to a 1-MHz GaN demonstrator,...
This paper discloses the development of 15-kV class intelligent universal transformer (IUT) to show system level design, circuit topology, and prototype test results. The complete system is split into two stages: (1) high-voltage ac to low-voltage dc and (2) low-voltage dc to low-voltage ac. With the adoption of silicon carbide (SiC) devices, the high-voltage front-end ac to low voltage dc conversion...
The integration of series connection of insulated gate bipolar transistors (IGBTs) and multi-level can achieve high voltage converters with low total harmonics distortion (THD). However, due to the transient voltage unbalance, the series connection technology has not been widely applied. Asynchronous gate drive signals, which cause series-connected IGBTs not to turn-on and turn-off at the same time,...
Three-phase isolated ac-dc converters can be implemented either with a direct three-phase PFC rectifier front end followed by an isolated dc-dc converter, or with three single-phase isolated ac-dc converters. Generally, the major advantage of the modular implementation with three single-phase converters is its ease of power expandability. In implementations with Y-connected single-phase modules in...
This paper presents a digital Active Gate Drive (AGD) methodology for power semiconductor devices. The inherent latency limitation of digital signal processing systems is addressed by a sequential optimization procedure that uses voltage and current signals recorded at the previous switching edge to develop an optimized gate drive waveform for the next switching edge. Experimental results using a...
This paper introduces a direct power control (DPC) procedure for a doubly fed induction generator (DFIG) — based wind power generation system under distorted grid voltage. By dissecting the six times grid frequency power pulsation created by the fifth and seventh grid voltage harmonic parts, a novel DPC technique with vector proportional integrated (VPI) controller has been proposed to actualize the...
To insure reliability in electrical networks, loads are supplied by more than one source. In this paper a transfer scheme using two Static Transfer Switches (STS) located remotely is presented for transferring the feeder load to an alternate source that is out of phase from the primary (preferred source). The objective is to have a minimum disruption to the feeder voltage in terms of the dead time...
Switched Capacitor (SC) techniques have grown to be the de facto standard for implementation of blended signal blocks in modern CMOS VLSI. The performance regarding switched capacitor circuits enormously be determined by the productive design of Non Overlapping Clock (NOC). Standard NOC generator circuits offered within the literature build use of delay circuits realised victimizing standard CMOS...
The consumer electronics trends of miniaturization and portability have been pushing the integrated Class-D audio power amplifier (PA) market for a number of years. This creates opportunities for new players in the market, through reduction of output LC filter size and reduction of power losses. In battery-powered applications, near-idle power loss is of particular interest, since the audio PA will...
Switched-capacitor (SC) DC-DC converters have gained attention based on their ability to offer a low-cost high-efficiency power conversion, and allow a thin and compact module packaging [1]. However, the SC DC-DC converter offers high efficiency only in a limited input/output voltage range, since it is inherently based on a discrete conversion ratio, which is different from an inductor-based DC-DC...
In this paper, an Analog to Digital Converter (ADC) based on binary-search algorithm is proposed. Existing binary-search based ADC design requires 2N-1 comparators for an N-bit ADC while the proposed design requires only N comparators. This ADC uses a switching network made up of static logic gates and MOSFET switches for predicting the reference voltage for the comparators. The proof-of-concept 3-bit...
Induction heating for domestic usage is quite popular and in some countries, it is a highly cost-sensitive product. A single IGBT (Insulated Gate Bipolar Transistor) quasi resonant power stage is the most popular topology for this application. In this paper we explain method in which the topology works reliably irrespective of widely varying input voltage, open loop operation and inconsistent utensil...
The Linear Regulators with traditional MOSFET are used for low noise, low ripple, and fast transient applications. The Switching Regulators have low power dissipation, high efficiency and high power density. Both of the regulators properties can be improved with the help of improvement in the traditional MOSFET. In this research I have been designed the Linear Regulator and Switching Regulator with...
A 5V analog maximum power point tracking (MPPT) controller integrated circuit (IC) based on ripple correlation control was presented in this study to achieve the maximum power from the photovoltaic array or solar panel under partial shading during the first 72 hours following a disaster when power interruptions and inaccessibility to light may be expected. The IC was implemented in TSMC 0.25 micron...
An efficient modeling of motor drivers using an H Bridge configuration driven by charge pumps controlled by embedded components is presented. N-channel MOSFETs and charge pumps together eliminate the problems of Dead time of MOSFETs and High values of RDS (ON). The embedded system using an ATMEL microcontroller drives the load and monitors the load voltages and input PWM to establish a closed loop...
In most portable electronics equipment's, batteries are used as a source of power. Some efficient power management technique is required in order to get longer battery life. In some batteries, output voltage is not constant so an additional switching power unit is required to get a constant output voltage. Due to the power loss occurs in the storage devices, the efficiency of these converters is reduced...
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