Thilina S. Ambagahawaththa - Academia.edu (original) (raw)

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Papers by Thilina S. Ambagahawaththa

2018 IEEE 27th International Symposium on Industrial Electronics (ISIE)

A family of ultra-high step-up DC-DC converters based on a feed-forward capacitor and a coupled-i... more A family of ultra-high step-up DC-DC converters based on a feed-forward capacitor and a coupled-inductor is proposed. The voltage conversion ratio of the proposed converter family is a polynomial of the turns ratio of the coupled-inductor which is obtained by the time-multiplexing operation of the coupled-inductor and the feed-forward capacitor. The time multiplexed operation of the coupled inductor is explained with ideal waveforms which are employed to derive a generalized expression for the voltage conversion ratio of the proposed converter family. The operation of the proposed converter family is verified using simulation results.

2018 8th International Conference on Power and Energy Systems (ICPES)

This paper proposes a high step-up boost converter family which is based on a switched coupled in... more This paper proposes a high step-up boost converter family which is based on a switched coupled inductor (SCL) and a voltage litter cell. The derivation of converter topologies of the family using SCL and voltage litter cell is explained in detail. The operation of the converters is explained using the converter which has the highest gain. The operation of the other converter topologies can be explained using a similar approach. The converter with the highest gain is theoretically analyzed assuming its operation in the continuous conduction mode (CCM) to obtain expressions for the static voltage gain, capacitor voltages, voltage stresses of switching elements, inductor currents and boundary mode operation. The operation of the converter is validated using simulation assuming near ideal conditions.

22nd International Conference on Field Programmable Logic and Applications (FPL), 2012

IEEE Journal of Emerging and Selected Topics in Power Electronics

2018 8th International Conference on Power and Energy Systems (ICPES), 2018

An analytical method to derive a DC-DC converter topology for an arbitrary voltage conversion rat... more An analytical method to derive a DC-DC converter topology for an arbitrary voltage conversion ratio is presented in this paper. The proposed method can be employed to derive DC-DC converters based on single and multiple inductors. The derivation of DC-DC converters having single inductor is explained in detail with a brief introduction to the multiple inductor derivation. The basic switching cells that can be incorporated into the single inductor based converters to obtain higher gain is introduced. Furthermore, their use to realize existing converter topologies is illustrated to validate the applicability of the proposed method to derive converters having an arbitrary gain.

IEEE Transactions on Industrial Electronics, 2021

An analytical method to synthesize a non-isolated multi-inductor (uncoupled) DC-DC converter havi... more An analytical method to synthesize a non-isolated multi-inductor (uncoupled) DC-DC converter having an arbitrary voltage conversion ratio is presented in this paper. The proposed method provides a direct approach to synthesize the converter unlike the traditional topology synthesis methods, which involve circuit manipulations or selecting a connection matrix from a pool of possible matrices. As a result, the proposed method simplifies the topology synthesis of a converter having known properties to a four-step process. To this end, the voltage conversion ratio is decomposed, allowing to synthesize it using single inductor switching cells. The resultant single inductor switching cells can be either cascaded or differentially connected as pairs or embedded within a switching cell to realize a multi-inductor-converter. Several existing converter topologies have been synthesized to demonstrate the applicability and usefulness of this straightforward method. The operation of the synthesi...

TENCON 2017 - 2017 IEEE Region 10 Conference

2021 IEEE 30th International Symposium on Industrial Electronics (ISIE)

Motion Blur due to the relative motion between the camera and object can seriously degrade image ... more Motion Blur due to the relative motion between the camera and object can seriously degrade image quality. We present an FPGA based blur detection and correction algorithm which is implemented on top of a configurable soft-processor based architecture. The system consists of two main modules. The blur detection module identifies the blur length and angle, and the restoration module uses regularized inverse filtering to remove the blur. The Processing algorithms are implemented as separate cores on the FPGA fabric where the soft processor core is only used for managing system configuration. The system can achieve a frame rate of 15fps for a 720p HD video stream.