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In this paper, we examine a design method for control system to attenuate periodic input disturbances using disturbance observers for time-delay plants. The disturbance observers have been used to estimate the disturbance in the plant. Several papers on design methods of disturbance observers have been published. Recently, parameterizations of all disturbance observers and all linear functional disturbance...
A lot of Ultra Wideband (UWB) antenna designs, especially printed antenna, have been proposed so far. However, among those proposed designs, only single unit antenna analysis i.e. return loss and radiation pattern at particular frequencies are usually observed. This paper reports a deeper transmission analysis by considering UWB antenna as a system; so called system characterization. For a specific...
Proportional integral-derivative (PID) control is one of method to use in the control system or feedback control. In this paper presents the optimum output of controller by used the fractional-order PIλDμ is verified on the operational transconductance amplifier (OTA) analogue circuit. The method of approximation function and circuit design are presneted and shown simple of fraction-order PIλ Dμ design...
If a pulse frequency, a load resistance of an LLC current-resonant DC-DC converter are changed, the dynamic characteristics is varied greatly, that is, the LLC current-resonant DC-DC converter has non-linear characteristics. In many applications of DC-DC converters, loads cannot be specified in advance, and they will be changed suddenly from no loads to full loads. A DC-DC converter system used a...
This paper proposes a new technique for designing a robust controller for an ACMC (Average Current Mode Control) buck converter. The proposed technique is based on the concept of 2DOF H∞ loop shaping control (2DOF HLS) which can be adopted to find the robust controller. However, the structure of the conventional robust controller is normally complicated with high order. This makes the difficulty in...
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