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The purpose of this study is to illustrate a new method for sensorless vector control of induction motors. This approach uses Zero-Crossing Times (ZCT) signal of stator current to estimate rotor speed. ZCT signal contains useful information which can be used for estimation of rotor speed and resistance. We have used this information for online estimation of rotor speed. To avoid time consuming fast...
In this paper we propose a traffic isolation method to be used in cluster-based broadcasting algorithms. For internal broadcast traffic, cluster-heads and gateways are responsible for re-broadcasting but for external ones, border nodes may perform the forwarding function as well. This simplifies the gateway selection method through the local selection of gateway nodes by its cluster head. This reduces...
In the regulated switching power supplies, the output voltage is usually sampled across a resistive voltage divider. In high voltage applications, the resistance of the voltage divider is very high in order to reduce its power loss. Therefore, these resistors are very good receivers of environment noise. This paper introduces a new control method for a high power, high voltage flyback converter insensitive...
A direct conversion modulator-demodulator with even harmonic mixers for fixed wireless applications is presented. The circuits consist of even harmonic mixers (EHMs) realized with antiparallel diode pairs (APDPs). The self-biased APDPs are used to flatten the conversion loss of the mixers. We also evaluate the different levels of I/Q imbalances and DC-offsets and use signal space concepts to analyze...
In this paper, we present a new direct conversion receiver based on multi-port structures that are very suitable for software defined radio applications. The proposed receiver is a five-port architecture which provides some advantages in compare to the previous architectures. The microwave simulations have been conducted to show its abilities as a direct demodulator. Meanwhile, the measured results...
In this paper, an analytical approach is proposed to study the performance of HBT_HEMT matrix amplifiers. A closed form relation for the central line attenuation function of the matrix amplifier is obtained which is very useful in the consideration of the influence of several parameters on the device performance. It is shown that this structure may have lower attenuation respect to the traditional...
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