This modulation method is based on selective virtual loop mapping, to achieve dynamic capacitor voltage balance without the help of an extra compensation signal. The concept of virtual sub module (VSM) is first established, and by changing the loop mapping relationships between the VSMs and the real submodules, the voltages of the upper/lower arm’s capacitors can be well balanced. This method d...

High-efficiency Step-Up Converter by using PV system with Reduced Diode Stresses sharing is proposed in this paper. Through employ of coupled inductor and switched capacitor, the proposed converters attain high step-up conversion ratio without operating at extreme duty ratio. Due to reutilize of leakage energy, the efficiency is developed and the large voltage spike on switch is improved, This ...

This thesis project examines the design of a monolithic audio-band digital-to-analog (D/A) converter with the objective of achieving a high signal-to-noise ratio, low analog die area consumption, and low static power dissipation. Issues relating to system design, digital signal processing, sigma-delta modulation, D/A topology selection, and switched-capacitor filter design are covered. The Dire...

This paper presents a literature survey of more than twenty years on AC/DC multilevel converters with reduced switch count, in which some power switches can be removed letting only diodes. simplification reduces the number gate drivers, cost and complexity system. In this work, considered topologies are derived from conventional configurations literature: Neutral Point Clamped, Cascaded H-Bridg...

This paper proposes a direct capacitance-to-digital converter (CDC) for biotelemetry applications. The proposed circuit is based on a charge redistribution technique using a capacitive sensor and a ranging capacitor array. The circuit does not require accurate reference voltages, so it is robust for fluctuation of supply voltage. Output-code range can be dynamically zoomed in arbitrary capacita...

Harvesting energy from the environment by using a thermoelectric generator (TEG) or photovoltaic cells provides a solution for battery-free sensor networks or electronic healthcare systems. In these systems, the harvested energy is supplied at a very low voltages, requiring a low-startup-voltage power circuit for kick-start from low voltage. A previous sub-100mV-startup-voltage boost converter ...

A radix-based digital self-calibration technique for multistage analog-to-digital converter(ADC) is presented. This technique can correct errors due to capacitor mismatch and finite opamp gain. The equivalent radix of each stage is extracted by measuring the discontinuity on the ADC transfer curve and iteratively adjusting the equivalent radix to minimize this discontinuity. A much more accurat...

—A 10-bit, 100 Ms/s switched capacitor pipeline A/D converter has been implemented in 0.25um CMOS in the 1.5-bit/stage architecture. Simulations results indicate 6.7 effective bits and max INL and DNL of 0.708 and 0.298 LSB, respectively. The design features a fully differential signal path and implements sub-ADC sections using a recently developed switched capacitor technique. Additionally, di...

A topological review of the single stage power factor correctted (PFC) rectifiers is presented in this paper. Most of reported single-stage PFC rectifiers cascade a boosttype converter with a forward or a flyback dc-dc converter so that input current shaping, isolation, and fast output voltage regulation are performed in one single stage. The cost and performance of a single-stage PFC converter...

Microbial Fuel Cells (MFCs) are bioreactors that convert chemical energy in organic compounds to electrical energy through the metabolism of microorganisms. Organic matters are widely available in the environment that contains a huge amount of energy. This energy could be harvested, converted, by the technology of MFCs, to be used in certain applications. Energy production of a MFC is limited i...