| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 104 === In recent year, due to the nearly saturation on smart phone market saturation, wearable electronic market products gradually rise. Many different types of wearable devices have been developed. The power supply system of wearable devices must be able to meet the needs of long-enough time operation. This thesis implements a low power boost converter for wearable applications. Due to the load sides of the applications are restricted in a light load, a boost converter with current limited pulse frequency modulation (PFM) operated in discontinuous conduction mode (DCM) is proposed for low power and high efficiency. The switching frequency of the control pulse of power transistor is varied according to the load current condition to greatly improve the conversion efficiency. Thus, the wearable devices can effectively extend their battery operating time.
In this thesis the boost converter is designed and implemented with TSMC 0.18μm 1P6M CMOS process. The converter accepts an input voltage of 1.3V ~ 2V, and generates a regulated output voltage of 3V with a load current range of 1mA ~ 50mA. The simulated results show that the ripple of output voltage is less than 5 %. The line regulation, load regulation, and conversion efficiency are 6.79 mV/V , 0.054 mV/mA , and 88.6 %, respectively.
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