應用於10W太陽能板之數位脈寬調變技術整合電源管理晶片

Application for 10W Photovoltaic Cells of DWPM Integrated Power Manage IC

王立豪(Li-Hao Wang)

指導教授 ： 鍾文耀

中原大學/工學院/電子工程研究所/碩士(2012年)

https://doi.org/10.6840/cycu201200458

摘要

近幾年來，石油危機加速太陽能電力系統的研究與發展。為了收集較多太陽能板輸出能源，我們使用離散元件完成具最大功率點追蹤法(Maximum Power Point Tracing)之太陽能轉換儲能系統，將10W太陽能板透過升壓電路，對24V鉛酸電池充電，系統轉換器轉換效率達86%。但離散元件之間的寄生電感、電阻與電容嚴重影響轉換效率和系統穩定度，以及升壓轉換器之切換頻率過慢，造成電感感值與系統體積過大，高成本問題。故本研究提出使用TSMC 0.25um BCD 60V高壓製程，將功率電晶體(Power MOS)、低壓降穩壓器(Low Drop-out Regulator)、與DPWM(Digital Pulse Width Modulation)數位控制電路整合積體化。設計輸入電壓耐30V,30mA負載電流之低壓降穩壓器穩定輸出4.7V電壓提供給DPWM數位電路，而DPWM數位電路將從ATMega8A微控制器輸出追蹤最大功率點所需之PWM(Pulse Width Modulation)數位訊號，輸出切換頻率700KHz之PWM訊號對功率電晶體開關切換，全晶片模擬結果輸出轉換效率高達94%。

關鍵字

低壓降穩壓器 ； 數位脈寬調變 ； 升壓電路 ； TSMC 0.25um ； 太陽能電池

並列摘要

In recent years, the oil crisis has accelerated the research and development of solar electric power systems. To generate maximum power output from 10W solar cells, we used a number of discrete components along with maximum power point tracking (MPPT) technique. Boost voltage charge 24V lead-acid battery, system conversion up to 86%. But the parasitic inductance, resistance and capacitance along with the number of discrete components will decrease the conversion efficiency and reliability of the system.
In this paper, we proposed a highly integrated DC-DC converter with a 5V 30mA high voltage low dropout (LDO) regulator and 8-bit 700 KHz digital pulse width modulation (DPWM) circuit for 10W photovoltaic cells. This design uses TSMC 0.25μm BCD 60V process, with the integration of a 5V 30mA high voltage low drop-out(LDO) regulator that provides the DPWM. In addition it drives the power of the NMOS Gate of the microcontroller to carry out the MPPT algorithm operation. The DPWM along with the microcontroller (ATMega8A) will improve the DC-DC converter switching frequency 700KHZ and the inductor will reduce the size of the overall system and circuit cost. The chip area is 0.81mm2 with the conversion efficiency of 94%.

並列關鍵字

LDO ； Boost Circuit ； Photovoltaic ； DPWM ； TSMC 0.25um

參考文獻

[1] 王鈺翔, 應用太陽能系統作為無人飛行載具之電力來源, 國立成功大學航空太空工程研究所碩士論文, 2004.

[4] R. C. C. Y. Podrazhansky, “The Art of Battery Charging,” 1999, pp. 233-235.

[8] M.-H. H. a. K.-H. Chen, “Single-Inductor Multi-Output (SIMO) DC-DC Converters With High Light-Load Efficiency and Minimized Cross-Regulation for Portable Devices,” 2009, pp. 1099-1111.

[9] H. M. A. F. KUROKAWA, “New Solar Cell Power Supply System Using a Boost Bidirectinal DC-DC Converter,” 1984, pp. 51-56.

[11] A. c. Nistor Daniel Trip', Marin Tom$e, “Increase of the Eficiency for a Solar Renewable Source Using a Soft Switched DC-DC Boost Converter,” 2007, pp. 1-4.