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In this paper a novel modulation technique is proposed to eliminate instabilities such as subharmonic and chaotic oscillations in dc-dc switching converters. This modulation technique injects a stabilizing signal which is generated internally from its own state variables so that the system is free from the problems due to externally injected signal, such as frequency mismatch, phase shift, etc. Stability...
Power electronic systems exhibit different types of fast- and slow-scale instabilities which limit the stable operating range of the parameters. It has been shown that the stability of complex power electronic systems can be fruitfully investigated using the Filippov method, where the stability of the system is given by the eigenvalues of the monodromy matrix, which is a combination of the state transition...
In this paper radiation pattern synthesis of time modulated circular antenna array is dealt with. Optimal switching time sequence and optimal uniform inter element spacing is used as variable to control the radiation pattern of the array. The optimal value of controlled parameter can be obtained by the evolutionary optimization technique. Three algorithms real coded algorithm (RGA), particle swarm...
Concurrent error detection and correction is an effective way to mitigate fault attacks in cryptographic hardware. Recent work on differential power analysis shows that even mathematically-secure cryptographic protocols may be vulnerable at the physical implementation level. By measuring energy consumed by a working digital circuit, it is possible to gain valuable information about the encryption...
Reconfigurable Computing has been evolving as a new platform for satisfying the simultaneous demand for application performance and flexibility placed over the present day DSP market. Since signal processing algorithms place significant demand on the processing power of the underlying platform, high performance reconfigurable architectures promise to be very efficient. The performance of traditional...
The existence of period-doubling bifurcation cascades and chaos in DC drives with full-bridge converter is well known. This paper reports for the first time the occurrence of coexisting attractors with a fractal basin of attraction in this relatively simple deterministic system. At some parameter values the trajectories converge on either a period-1 or a period-3 attracting set depending on the initial...
The paper demonstrates, both numerically and experimentally, the quasiperiodic and subharmonic operation in a load resonant DC-DC converter. The output voltage of the converter is controlled by a closed loop, applying constant-frequency pulse width modulation. The complexity of the system is contributed by fact that the state space is five-dimensional, with four switching surfaces dividing it into...
This paper demonstrates how load regulation can be improved in a current controlled tri-state boost converter along with the elimination of the right-half-plane (RHP) zero. Although use of a PI controller improves regulation, it degrades the dynamic performance, and a higher integral gain results in a considerably reduced phase margin. The objective of this paper is to investigate an alternative method...
This paper presents an analog to digital converter (ADC) capable of resolving 8 bits at a sampling rate of 250 MSPS. Primary objective of the design has been to make a trade-off between power consumption and resolution while keeping the sampling rate high. The parallel-pipeline architecture was best fit for such requirements. A new sub-ADC scheme has been introduced here to remove possible switch...
This paper presents the concept of a voltage controlled pulse skipping modulation (VCPSM) in a dc-dc converter, which improves the efficiency, ripple magnitude, and transient response over a wide range of light load condition. The duty ratio of VCPSM, instead of remaining constant as in a classical PSM, is controlled using the voltage mode control with an additional input voltage feed-forward along...
Networking devices today consume a non-trivial amount of energy and it has been shown that this energy consumption is largely independent of the load through the devices. With a strong need to curtail the rising operational costs of IT infrastructure, there is a tremendous opportunity for introducing energy awareness in the design and operation of enterprise and data center networks. We focus on these...
A novel current mode control scheme for the tristate boost converter circuit is proposed, which eliminates the zero in the right-half plane (RHP), and improves the dynamic performance. The tristate boost converter contains an additional switch across the inductor. Within a clock cycle, the inductor current first rises during the on interval of the main switch, then falls during the off or capacitor...
Novel controllers to improve the stability of coupled interleaved buck converters operating under current-mode control are proposed in this paper. The controllers are employed to force the eigenvalues of the monodromy matrix of the system (the state transition matrix over one full cycle) inside the unit circle, thus avoiding the Neimark bifurcation which has been known to occur in this system. The...
In the absence of end-to-end quality of service (QoS), overlay routing has been used as an alternative to the default best effort Internet routing. Using end-to-end network measurement, the problematic parts of the path can be bypassed, resulting in improving the resiliency and robustness to failures. Studies have shown that overlay paths can give better latency, loss rate, and TCP throughput. Overlay...
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