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標題: 具負電壓控制技術之低電壓直流轉直流升壓轉換器
A Low Voltage Step-Up DC-DC Converter with Negative Voltage Control Technique
作者: 李明勳
Lee, Ming-Shiun
關鍵字: 能量;energy harvesting;擷取;低電壓;升壓;low voltage;boost;step up
出版社: 電機工程學系所
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在可穿戴式電子產品中,熱能轉電能的應用遇到的最大問題就是低電壓輸出,為了使負載電路能夠使用這電能,用以升壓的介面電路為設計重心。因此我們設計了一低電壓啟動的直流轉直流升壓轉換器,並利用負電壓控制技術(Negative Voltage Control Technique, NVCT)有效地降低Native NMOS功率元件關閉電流過大的問題,進一步提升效率。
轉換器由低電壓時脈產生器、負電壓產生器、脈波產生器、電壓偵測器、推動放大器、功率電晶體及被動元件構成。首先電壓源提供電壓給低電壓時脈產生器,輸出一時脈訊號去驅動Native NMOS的功率開關,當輸出電容充電至預定電壓值後,由電壓偵測器送出訊號去切換操作,利用負電壓產生器輸出的負電壓去關閉具初始導通特性的功率電晶體,由一般臨界電壓的功率電晶體負責第二階段的升壓。
本電路使用TSMC 0.18um 1P6M CMOS的製程,啟動電壓為300mV,輸出電壓在空載時可升壓至2V,當負載為1.5mA時有最高電壓轉換效率為63%,最大負載電流可至3.2mA,其對應的輸出電壓為1V。

In recent years, energy harvesting technologies have become a very popular field of study. With these technologies, we can transform environmental energy, such as solar energy, heat, and vibration energy, into electric energy. The harvesting energy can be used for electronic devices without external battery, such as wireless sensor networks or wearable biomedical devices. A critical part of the whole system is the interface circuit that lies between the energy source and the load circuit to provide proper voltage and current level to the load circuit.
In wearable electronics products, the biggest problem of the application of thermal energy transfer is the low voltage output. For the load circuit to use this power, an interface circuit for boosting is the design to focus. Thus, a low-voltage startup DC-to-DC boost converter is designed and the negative voltage control technology (NVCT) is utilized to enhance efficiency by minimizing the leakage current when the Native NMOS is off.
The converter is composed of low voltage clock generator, negative voltage generator, pulse generator, voltage detector, buffer, power transistor, and passive element. First, voltage source provides a voltage to the low voltage clock generator, which outputs clock signal to drive the Native NMOS power switch. When the output capacitor is charged to a predetermined voltage value, the voltage detector sends a signal to change operation. The negative voltage generator generates a negative voltage to turn off the Native NMOS power transistor. Finally, the normal VTH power switch is responsible for the second phase of the step-up.
The circuit was designed by using TSMC 0.18um 1P6M CMOS process. The startup voltage is 300mV and the output voltage can reach 2V with no load. The maximum voltage conversion efficiency is 63% with 1.5mA of output current, and the maximum load current is 3.2mA with 1V output voltage.
其他識別: U0005-2608201314131700
Appears in Collections:電機工程學系所

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