Design and Implementation of Switching Converter with High-Voltage Process
Date Issued
2015
Date
2015
Author(s)
Wen, Hsin-Yuan
Abstract
With the popularization of portable devices, a high efficiency power converter means a longer lifetime; a lower ripple indicates a more stable power supply and better consumer experience. Therefore, it is urgent to enhance the power conversion efficiency and lower the ripple voltage. Hysteretic switching converters have advantages such as simple structure, fast transient response and unconditional stable. However, due to its undefined switching frequency, the EMI filter will be hard to design. In our first chip, we introduce a new architecture by using the concept of phase-locked loop. In addition, the switching frequency in light load and heavy load will be optimized in order to enhance the conversion efficiency. The measurement results show that at a 10 mA inductor current, the conversion efficiency can be improved by 70%; the efficiency in heavy load is also slightly improved. This work is fabricated in TSMC 0.25μm. The core of the chip occupies only 387k μm2 (with by-pass capacitors). Also, the exhaustion of fossil fuel cause the importance of renewable energy, the development of energy harvesting circuits is also flourishing. The conversion efficiency of solar cell has come to 44.7% and keep going toward 50%, a high efficiency solar energy will be imperative. In our second chip, we focus on solar energy harvesting system and design a whole system that can convert energy from solar cell to super capacitor. The output voltage of solar cell is about 0.5V, it is fed to a charge pump circuit that can operate under this kind of low voltage. A boost converter is then connected to the charge pump so that it can convert the 3.3V to over 10 V. In addition, the characteristic curve (I-V curve) of the solar cell varies with different operating conditions. Thus, a maximum power point tracking (MPPT) algorithm is needed to optimize the conversion efficiency of the whole system. In this thesis, the boost converter of the system will be implemented. The chip is also fabricated in TSMC 0.25μm HV process.
Subjects
buck converter
hysteresis mode control
frequency control
phase-locked loop
boost converter
current mode control
high-conversion-ratio
SDGs
Type
thesis
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