【摘要】：開關電源型DC-DC轉(zhuǎn)換芯片由于具有拓撲結構靈活、轉(zhuǎn)換效率高、應用范圍廣和可集成度高等優(yōu)點被廣泛運用于各類便攜式電子產(chǎn)品的電源管理單元（PMU）中。隨著白光LED照明、移動電源和智能鋰電池充電器的迅速發(fā)展，升壓型（Boost）DC-DC轉(zhuǎn)換器芯片作為這些產(chǎn)品中必不可少的部分，已成為近年來集成電路行業(yè)的研究熱點之一。 針對單節(jié)鋰電池充電器，本文采用SMIC0.18μm工藝設計了一款峰值電流模式Boost轉(zhuǎn)換器芯片，其輸入電壓范圍為1.8V~3.3V，輸出電壓穩(wěn)定于4V，負載電流范圍為200mA~600mA，系統(tǒng)開關頻率為1MHz。在設計過程中，提出了一種新型電流檢測電路，實現(xiàn)了高精度、鏡像管低匹配誤差和低功耗的電感電流檢測；同時，提出了一種帶有吉爾伯特單元的斜波補償電路，有效地消除了電流模式容易出現(xiàn)的次諧波振蕩現(xiàn)象。仿真結果表明，，所設計的Boost轉(zhuǎn)換器芯片的最高轉(zhuǎn)換效率高達92%，且平均瞬態(tài)響應時間為48.7μs，最大輸出電壓紋波為72mV，因此具有瞬態(tài)響應快和紋波系數(shù)低等特點。 文中首先介紹了DC-DC轉(zhuǎn)換器的常用拓撲結構、調(diào)制方式和反饋機制，然后詳細推導了Boost拓撲結構在連續(xù)導通模式（CCM）和斷續(xù)導通模式（DCM）下的常用電學表達式，之后從外圍元件的選擇、電流檢測方案分析和基于Matlab環(huán)路穩(wěn)定性分析三個方面介紹了系統(tǒng)設計思路，接著基于Cadence Spectre完成芯片各模塊的電路設計和仿真驗證，最后在實際工作條件下進行系統(tǒng)仿真并得出結論。
[Abstract]:Switching power supply (DC-DC) converter is widely used in the power management unit (PMU) of portable electronic products because of its advantages of flexible topology, high conversion efficiency, wide application range and high integration. With the rapid development of white LED lighting, mobile power supply and intelligent lithium battery charger, booster (Boost) DC-DC converter chip, as an essential part of these products, has become one of the research hotspots in integrated circuit industry in recent years. For a single lithium battery charger, a peak current mode Boost converter is designed using SMIC0.18 渭 m technology. The input voltage range is 1.8 V / L 3.3V, the output voltage is stable at 4V, the load current range is 200mAn 600mA, and the switching frequency of the system is 1MHz. In the process of design, a novel current detection circuit is proposed, which can detect inductance current with high precision, low matching error and low power consumption. At the same time, an oblique wave compensation circuit with Gilbert cell is proposed. The phenomenon of subharmonic oscillation which is easy to occur in current mode is effectively eliminated. The simulation results show that the maximum conversion efficiency of the designed Boost converter is as high as 92um, the average transient response time is 48.7 渭 s, the maximum output voltage ripple is 72 MV, so it has the characteristics of fast transient response and low ripple coefficient. In this paper, the common topology, modulation mode and feedback mechanism of DC-DC converter are introduced, then the electrical expressions of Boost topology under continuous on-mode (CCM) and intermittent on-mode (DCM) are derived in detail. Then the system design ideas are introduced from three aspects: the selection of peripheral components, the analysis of current detection scheme and the stability analysis based on Matlab loop. Then the circuit design and simulation verification of each module of the chip are completed based on Cadence Spectre. Finally, the system simulation is carried out under the actual working conditions and the conclusion is drawn.
【學位授予單位】：暨南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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