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This assay supposed one kind of asymmetrical multi-level inverter that based on the topology of cells cascading, every cell in this inverter is composed of one two-levels inverter series with several three-levels H bridges, the controlling system is constructed by DSP and FPGA. This article described the topology of this inverter and its controlling methods in detail. In final, tested this inverter's...
Modelling and simulation of closed loop controlled class D current source resonant inverter (CSRI) for ferromagnetic load is presented in this paper. The converter can operate effectively even for fluctuating source and it operates in zero-current switching mode. The switching devices are connected through a common ground and need only a single DC power supply for the gate driver circuitry. The aim...
The concurrent transmission and reception of the signals in different frequency bands are required for the mobile terminals in IMT-Advanced systems to support spectrum aggregation systems. The authors have proposed a new transmitter architecture that enables the concurrent transmission of two separate frequency bands. The architecture is based on delta-sigma (ΔΣ) modulation, which converts a non-constant...
The gyro stabilized platform control is required to isolate the line of sight (LOS) from the disturbance and vibration of carrier and ensure pointing and tracking for target in electro-optical tracking system. A compound adaptive fuzzy PID control with hysteresis-band switching is developed for this servo system with nonlinear property and some uncertainties. Here, in the adaptive fuzzy controller,...
Settling time is a crucial design issue in Phase-Locked Loop (PLL) used in modern wireless communication systems. A Digitally Controlled Oscillator (DCO)-based multi-operational modes All-Digital PLL (ADPLL), which can achieve an ultra fast settling time of 10 ??s, has been intensively researched. This paper describes a novel Counter-Based Mode Switching Controller (CB-MSC) for the ADPLL to further...
A direct baseband to millimeter wave phase shift keyed modulator architecture together with some key performance metrics is presented. The transmit assembly is designed to cover an ultra wide bandwidth from 32-66 GHz. The modulator is capable of operating with up to 1 Gbps rate and can produce BPSK/QPSK and OQPSK modulation.
Random carrier-frequency (RCF) modulation has been applied to DC/DC converters, reducing conducted EMI significantly. The selection of the duty cycle is critical in terms of suppressing EMI level in RCF modulation. But limited related literature is available. In this paper, we analysis the effect of duty cycle on suppressing EMI level by deduced the expression of the amplitude of switching voltage...
A novel method for directly producing QPSK modulation from baseband IQ signals is presented. The key feature of the architecture is the absence of mixers and as a result unwanted mixing products. A broadband MMIC modulator chip is demonstrated at V band to showcase the performance of the modulator. It completely covers the world wide frequency band allocation for the forthcoming 60 GHz indoor wireless...
In this paper, an analysis is given to the topology of cascaded seven-level inverter. Then its simulation model is set up. On the other hand, several carrier control strategies are discussed, modeled and applied for the control of this multilevel inverter respectively, including phase disposition, phase opposition disposition and alternative phase opposition disposition. Then the switching control...
Driven by the compulsory requirement of dilution the deleterious gas immediately in coal well underground laneway for safety production, a novel pulse density modulation (PDM) HF converter for the mining local fanner is introduced in the paper. In this PDM converter, the high frequency technique is employed to minimize the converter cubage owing to the limitation of the small work space in the underground...
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