本論文提出應用於光獵能系統之自啟動單電感升降壓轉換器，利用CMOS太陽能電池收集能量，經過電源管理單元，為感測器提供穩定的電源。由於CMOS太陽能電池所能提供之電壓極低，而為了解決在低電壓下無法正常啟動電源管理單元之問題，本論文提出一啟動電路架構，由環形振盪器(Ring Oscillator)、非重疊電路(Non-Overlapping)、電荷幫浦(Charge Pump)、時脈產生器(Clock Generator)及電壓偵測器(Voltage Detector)所組成，針對電源管理單元在低電壓之條件下仍可啟動，並加入模式切換電路，於電源管理單元正常運作後將啟動電路關閉以降低整體電路之功率消耗，維持高能量轉換效率，且在輸出電壓過低時能夠重新開啟啟動電路，使電源管理單元得以持續正常運作。
應用於光獵能系統之自啟動單電感升降壓轉換器使用TSMC 0.18μm CMOS標準製程實現，整體晶片佈局面積為1.08749×1.408 mm2 (含I/O pads)，其輸入電壓為0V~0.55V，後模擬結果顯示，輸出電壓可藉由內建之超低功耗電壓參考電路穩定在1V，而輸出負載電流範圍坐落於0.001~1mA，其中在負載電流為1mA時，可達最高能量轉換效率94.3%。

In this thesis, a self startup buck/boost converter applied to solar energy harvesting system is introduced to supply power to IoT sensor node. Since the voltage provided by CMOS solar cells is extremely low, to solve the problem that the power management unit can’t be started normally under low voltage, a startup architecture is proposed for help. The startup circuit composed of ring oscillator, non-overlapping circuit, charge pump, clock generator and voltage detector. It also processes a mode switching architecture which can not only turned off the startup circuit after the DC-DC converter operates normally to reduce the power consumption but also restart the startup circuit when the output voltage becomes too low so that to push back the power management unit to normal operation.
The self-startup single-inductor buck/boost converter for light-harvesting is designed with a TSMC’s 0.18μm standard CMOS process. The overall chip area is 1.08749×1.408 mm2 (including I/O pads) and its input voltage range is 0V – 0.55V. The post layout simulation results have shown the output voltage can be stabilized at 1V successfully. The proposed converter is designed to provide 0.001 – 1mA output current to supply enough energy to the load and the peak conversion efficiency is 94.3% at 1mA load current.

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