In universal-line ac/dc converters that require power factor correction (PFC), maintaining a high efficiency across the entire line and load ranges poses major challenge. Typically, boost PFC front end exhibits 1%-3% lower at 100-V compared to 230-V line. It is shown in this paper buck with an output voltage 80-V range can maintain ranges. A thorough analysis of converter operation performance along design optimization guidelines are presented. Experimental results obtained on 90-W notebook...

This paper presents a new approach for power amplifier design using deep submicron CMOS technologies. A transformer based voltage combiner is proposed to combine generated from several low-voltage amplifiers. Unlike other combining transformers, the architecture presented in this provides greater flexibility access and control individual amplifiers combined amplifier. In work, has been utilized output improve average efficiency at back-off. technique does not degrade instantaneous peak...

Energy harvesting (EH) from ambient energy sources can potentially reduce the dependence on supply of grid or battery energy, providing many benefits to green communications. In this paper, we investigate device-to-device (D2D) user equipments (DUEs) multiplexing cellular (CUEs) downlink spectrum resources problem for EH-based D2D communication heterogeneous networks (EH-DHNs). Our goal is maximize average efficiency all links, in case guaranteeing quality service CUEs and EH constraints...

A control method that improves performance of series-resonant converters operate with a wide input voltage and/or output range by substantially reducing their switching frequency is introduced. The switching-frequency-range reduction achieved controlling the combination variable-frequency and delay-time control. Variable-frequency employed to primary switches, while used secondary-side rectifier switches provided in place diode rectifiers. converter proposed as stage on-board charger module...

Dead-time insertion increases noise and torque pulsation in motors under open-loop constant V/f control, it results instability sensorless field-orientated control or direct at low speed, degrading performance of motor drive systems. In order to overcome the drawback dead-time insertion, a novel current-detection-independent compensation technique based on terminal voltage A/D conversion is proposed this paper. Both current polarity time can be extracted from sampled voltage. Experiments an...

Neutral-point voltage unbalance seriously distorts the output waveform and may result in shoot-through of switching devices neutral-point-clamped three-level inverters. Compared with nearest three vector pulsewidth modulation (PWM), virtual space PWM (NTV <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> PWM) can balance neutral-point without limitation index power factor angle. However, period NTV is increased by one-third at same loss,...

Large, complex, expensive, and long-lived equipment often operate in harsh environments, which leads to the requirements of lifecycle maintenance, repair, overhaul (MRO). To support continuous improvement productivity reduce cost MRO, this paper developed a cloud-based framework for lean MRO with aforementioned characteristics. A concept model are proposed. Taking advantage design manufacturing (CBDM) into account, an architectural is case casting demonstrates that proposed can achieve goal...

It has been understood the large drawback of a CLLC bidirectional serious resonant converter is using three magnetic components, i.e., transformer and two inductors. In this paper, an integrated for simplifying boosting electrical vehicle (EV) plug-in (PHEV) on board charger module (OBCM) implementation performance proposed. The new including primary windings, one secondary winding, bobbin, core, are designed implemented. With integration, with high power density achieved while number its...

Insertion of dead time in space vector pulse width modulation (SVPWM) causes phase voltage and current distortion or even zero-current clamping phenomenon, degrading the control performance ac induction motor. In addition, analysis becomes more complicated due to existence parasitic capacitance power switching device source inverter (VSI). This paper tries make clear that how influences VSI's output independently. First, an equivalent circuit VSI containing is constructed. On basis,...

This paper presents a study of the isolated DC/DC stage Bi-directional on-board battery charger module (OBCM) for electric vehicle (EV) and plug-in hybrid (PHEV) application. The conventional series resonant converter secondary-side-switch delay-time control is employed. used to assist variable-switching-frequency primary switches reduce switching-frequency range. By utilizing gallium nitride (GaN) switches, operating frequency increased over 300kHz sizes passive components are reduced. new...

The paper presents novel transformer-flux-balancing control methods for the isolated bidirectional full-bridge (FB) converter with active clamp and dual-active bridge (DAB) converter. Both approaches are based on sensing of transformer magnetizing current. For FB current is obtained by a single current, whereas DAB converter, both primary secondary currents need to be sensed obtain Since in magnetizing-current can lead excessive dc values winding currents, an additional loop that eliminates...

The flashover performance of insulators is the foundation calculation precise lightning protection. material and structure an insulator affect its but research on differences in different analysis reason for these have not been clear. In this paper, impulse tests two types (composite glass insulators) were carried out National Engineering Laboratory (Kunming) Ultrahigh-voltage Technology. tests, hung a 110 kV double-circuit transmission tower standard (1.2/50 μs) was applied to insulators....

Abstract Kümmell disease (KD) causes serious vertebral body collapse in patients. However, only a few case reports have been conducted and the number of patients with KD investigated was limited. Additionally, frequently used poly(methyl methacrylate) (PMMA) bone cement for is limited by excessive modulus poor biocompatibility. Herein, we aimed to modify PMMA mineralized collagen (MC), compare clinical effects, image performance finite element analysis between modified treatment phase I II...

Capacitor charging power supply (CCPS) is one of the most important components a pulsed system. The CCPS studied in this paper used conditioning systems for Laser Nuclear Fusion. With view to enabling multiple CCPSs work concurrently an environment high voltage, and strong electromagnetism, carries out profound systematic research into characteristics capacitor supply, including rate, harmonic features, efficiency voltage precision, etc. Furthermore, some measures improve are put forward....

A 2.4GHz power amplifier is implemented with standard thin-oxide transistors in a 1.2V, 0.13 mum CMOS process. The output matching network fully integrated on chip. PA transmits up to 24dBm linear 25% drain efficiency at -1dB compression point. When driven into saturation, it 27dBm peak 32% efficiency. technique for enhancing average proposed and demonstrated. This does not degrade instantaneous maintains constant gain back-off

This paper presents a novel sensorless startup strategy for 315-kW high-speed magnetic suspension brushless dc (BLDC) motor with small inductance and nonideal back electromotive force (EMF). Two key strategies on the of BLDC are presented: First, current inductance; second, self-adaption control to compensate commutation error EMF in stage. A hybrid pulsewidth modulation based load torque is proposed limit current. An optimal curve system parameters presented, solve synchronous switching...

In addition to the traditional B1I signal, third-generation Beidou navigation satellite system (BDS-3) broadcasts a new civilian namely, B1C. These two signals can be combined form an asymmetric double-sideband which is called B1 composite signal. The Gabor bandwidth of signal much larger than that and B1C signals, indicates it has better ranging performance in theory. Traditional tracking methods for treat as whole, referred wideband methods. However, due large sampling rate processing...