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Fast curve fitting algorithm for parameter evaluation in lightning impulse test technique
(2015-10-01)
Pattanadech, Norasage
;
Yutthagowith, Peerawut
This paper proposes a fast curve fitting technique for the evaluation of the base curve of lightning impulse voltage and current. The proposed method is based on the waveform parameter estimation employing a numerical integration and linear least square method. This method is derived from an ordinary differential equation. The proposed algorithm is able to fit the base curve of lightning impulse voltage and current. The formula of the base curve is in the complex form of two exponential functions. The proposed form is superior to the conventional real exponential form, since it can be rewritten in a real conventional form used for fitting the impulse voltage or in a damped/undamped sinusoidal form with phase shift for fitting the impulse current. The decomposition base curve procedure was tested with some impulse voltage and current waveforms collected from the test data generator attached with IEC 61083- 2 (2013). The waveform parameters evaluated by the proposed method are compared with those recommended by the standards. The proposed method shows the better performance in computation time than the conventional method recommended by the standards. Due to no requirement of iteration in the proposed curve fitting method, the computation time is much shorter than the conventional iterative method. Moreover, the utilization of the established method does not allow the recorded impulse waveform distortion. Besides, the developed algorithm technique can be done easily with markedly accuracy and noise immunity. For the aforementioned reasons, there is no doubt that the proposed technique is a superior one for impulse parameter evaluation.
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Two new RC oscillators using CCIIs
(2005-12-01)
Fongsamut, Chalermpan
;
Fujii, Nobuo
;
Surakampontorn, Wanlop
Two new sinusoidal oscillator circuits using current conveyors are presented in this paper. The two oscillators are related to each other by the RC:CR transformation. Each oscillator consists of two positive second-generation current conveyors (CCII+) and the minimum of (four) passive elements, two capacitors and two resistors. One of the oscillators can be realized by employing grounded capacitors and is desirable for VLSI realization. The passive and active sensitivities of all circuits are quite low. The SPICE simulation and experimental works are performed to verify this theoretical prediction. © 2005 IEEE.
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Low-voltage high-speed PWM signal generations based on relaxation oscillator
(2002-01-01)
Siripruchyanun, M.
;
Wardkein, P.
This paper new two simple PWM (pulse width modulation) signal generations based on a modified relaxation oscillator are introduced. The advantages of the proposed principle are that the precise PWM signal can be easily achieved with a high frequency range up to several megahertz and a low-voltage power supply. The proposed circuits are able to accept either voltage or current modulating signals. They are very suitable for developing into integrated circuit (IC) form in communication applications. The simulation and experimental results are also depicted, and show good agreement with theoretical predictions.
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Multiphase sinusoidal oscillators using translinear current conveyors and only grounded passive components
(2001-01-01)
Loescharataramdee, C.
;
Kiranon, W.
;
Sangpisit, W.
;
Yadum, W.
A generalized multiphase sinusoidal oscillator is presented. The circuit realization uses the translinear bipolar second generation current-controlled conveyors to generate arbitrary n current signals equally spaced in phase. The proposed circuit consists of n multi-output current controlled conveyors and a current amplifier connected in cascade. The only passive component employed in each of the n conveyors is one grounded capacitor. The oscillation condition and oscillation frequency are independently controlled. The former depends only on the number of the phase signals of the oscillator. The dependency of the latter on the input resistance of the input ports of the current conveyors makes electronic tunability possible using the bias currents. The circuit also enjoys having simple structure and very low component count and it is highly suitable for monolithic implementation.
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Electronically tunable multifunctional translinear-C filter and oscillator
(1997-03-27)
Kiranon, W.
;
Kesorn, J.
;
Sangpisit, W.
;
Kamprasert, N.
The current-controlled second order multifunctional filter is described. It uses only three current controlled conveyors and two grounded capacitors. Three types of current transfers, highpass, bandpass, and lowpass, can be acheived simultaneously and both ω<inf>0</inf>, and Q are electronically adjustable. The circuit can also be modified to be a current controlled oscillator. The simulated results are illustrated.
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Current controlled oscillator based on translinear conveyors
(1996-07-18)
Kiranon, W.
;
Kesorn, J.
;
Wardkein, P.
A current controlled oscillator based on translinear current conveyors is presented. The oscillation frequency can be varied proportionally to the bias current. The oscillator uses two CCCII<sup>+</sup>s, and two grounded capacitors. SPICE simulation results agree with the theory.
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Current-mirror phase-shifter oscillator
(1987-01-01)
Pookaiyaudom, s.
;
Samootrut, K.
Recently proposed differential current mirrors have been used to realise phase-shifter circuits. Two of these phase-shifters are then cascaded to form a high-performance sinusoidal oscillator, where all active functional blocks are current mirrors. © 1987, The Institution of Electrical Engineers. All rights reserved.

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