Compact single-stage input-powered bridge rectifier with boost switch with high output power for energy harvesting system using 0.18-micron CMOS technology / Roskhatijah Radzuan

The demand on microwatt to milliwatts energy harvesting systems has been increasing recently with the increase of the needs for wireless self-powered device applications. With the small output voltage and the AC output from the micro harvesting generators, highly precise specifications, leading to challenging designs, optimizations and realizations of its every component are imposed. Rectifier, which is normally located right after the energy generator in the energy harvesting system, is required to be compact, with high efficiency to produce as high output power as possible. It is in this context that this thesis is focusing, where a new topology of CMOS bridge rectifier is proposed, offering advantages in terms of the compactness and high output power, which is suitable for wireless power devices applications. CMOS technology is seen as a straightforward solution for compactness as it offers possibility to reduce the full wave rectifier circuit size. The proposed rectifier circuit topology is designed such that the threshold voltage, which is a common source of voltage drop in the system, can be reduced, in order to maintain high output voltage

0.18µm-CMOS Rectifier with Boost-converter and Duty-cycle-control for Energy Harvesting

Existing works on battery-less of energy harvesting systems often assume as a high efficiency of rectifier circuit for power management system. In practice, rectifier circuit often varies with output power and circuit complexity. In this paper, based on a review of existing rectifier circuits for the energy harvesters in the literature, an integrated rectifier with boost converter for output power enhancement and complexity reduction of power management system is implemented through 0.18-micron CMOS process. Based on this topology and technology, low threshold-voltage of MOSFETs is used instead of diodes in order to reduce the power losses of the integrated rectifier circuit. Besides, a single switch with the duty-cycle control is introduced to reduce the complexities of the integrated boost converter. Measurement results show that the realistic performances of the rectifier circuit could be considerably improved based on the performances showed by the existing study

Studies on the Effect of Load Variations for Three-Phase AC-DC Current Injection Hybrid Resonant Converter

This paper presents an investigation on the effect of load variations for three-phase ac to dc current injection hybrid resonant converter. The performance of the converter was analyses with different values of output load resistor. The effect of load variations on the supply current waveforms, resonant current waveform and the output voltage waveform was observed and investigated. Apart of the waveforms, the performance of the converter was analyzed based on the total harmonics distortion (THD) level of the supply current waveform for both nominal output load operation and during increases the output load resistor. The circuit was simulated in MATLAB/Simulink environment. A 1-kW experimental test-rig was constructed to verify the output load variations studies for the three-phase ac-dc current injection hybrid resonant converter. Selected simulation and experimental results have been provided in the paper to validate the analysis

0.18µm-CMOS Rectifier with Boost-converter and Duty-cycle-control for Energy Harvesting

Existing works on battery-less of energy harvesting systems often assume as a high efficiency of rectifier circuit for power management system. In practice, rectifier circuit often varies with output power and circuit complexity. In this paper, based on a review of existing rectifier circuits for the energy harvesters in the literature, an integrated rectifier with boost converter for output power enhancement and complexity reduction of power management system is implemented through 0.18-micron CMOS process. Based on this topology and technology, low threshold-voltage of MOSFETs is used instead of diodes in order to reduce the power losses of the integrated rectifier circuit. Besides, a single switch with the duty-cycle control is introduced to reduce the complexities of the integrated boost converter. Measurement results show that the realistic performances of the rectifier circuit could be considerably improved based on the performances showed by the existing study