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Photovoltaic panel characterisation finds extensive use in output prediction, efficiency estimation and defect detection in photovoltaic (PV) industry. Out of the various characterisation methods available, the use of switched mode power converters is one of the most attractive solutions, owing to high speed, low power loss and additional maximum power point tracking ability. Duty ratio variation...
Power electronic traction transformer (PETT) is an emerging technology for traction applications. LLC resonant converter is an attractive option for isolated DC/DC stage because of its high efficiency. However, there will be inevitable twice-line frequency ripple on the resonant current due to the singlephase power fluctuation. On the other hand, parameter mismatch between modules can result in power...
Coupled tanks systems play an important role in teaching of control theory. Although due to the existence of two independent storages, making them a second order system, it has been shown that one time constant is at least 6 time greater than the other. In normal operation conditions this ratio is about 10–20. Therefore, special attention is necessary to explain their properties.
This paper proposes a fully-integrated solution for the PI compensation circuits in current-mode DC-DC converters used in automotive applications. In such applications, the switching frequencies are low and hence conventional PI compensation circuits employ large capacitors. The proposed analog/mixed-signal PI comprises an analog proportional amplifier and a digital integrator. The analog proportional...
The proposed paper conveys the working of Improved Negative Output Super-Lift Luo converter (INOSLC) which is a modified version of Negative Output Super-lift Luo Converter(NOSLC). NOSLC is a type of DC-DC converter in which the negative output voltage increases in ten to hundred times the input voltage. INOSLC produces still high output than NOSLC with less number of charging components employed...
A graphical/numerical technique is presented for the extraction of roots (poles and zeros) of RC and RL circuits, where the roots lay on the real axis in the s-plane. The method constructs a corresponding LC circuit for the RC or RL circuit, and as demonstrated, all real axis roots are shifted to the jω axis, where the swiping-frequency signals exit. The process takes place in two steps: in the first...
This paper presents the results from a theoretical study on the harmonic emission of a windpark in the frequency range up to 200 kHz. The calculations are based on the transfer function from an individual turbine to the pubic grid, expressed in the frequency domain. The model has been applied to a general windpark, for which a mathematical expression has been derived. The study provides relations...
A method for realizing the PD controller is presented in this paper. The circuit implementation is based on operational transconductance amplifiers (OTAs) as active elements with a grounded capacitor. The proportional gain and derivative time can be electronically varied by tuning the external bias current of OTA. Moreover, the structure of the proposed scheme can be simply realized the PID controller...
First-order voltage-mode all-pass filter providing high input and low output impedances is described. The proposed filter employs a fully-differential operational amplifier, a current-controlled current conveyor CCCII, and one capacitor, with the possibility of electronic control of natural frequency. Two voltage outputs are simultaneously available for non-inverting and inverting transfer functions,...
In this paper, we present new systematic method for the design of an analog PID controller, applied to the voltage-mode step-down (buck) DC/DC converters. The method relies on the specification of trajectory of the load transient response. Particularly, we are interested to design a controller limiting the voltage under/overshoot to its lowest possible value. It is shown that this lowest possible...
This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to select the proper topology. This ADC is implemented in a 0.35 mum AMS CMOS technology with 3.3 V single power supply. The capacitors and selected operational amplifiers were scaled for...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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