2012/9 龔哲民,黃忠民,黃祺峻,陳威銘
摘 要
本文提出一個無磁性元件無電解電容的直流/直流轉換器，為一個新型低成本多模式晶片整合型交換式電容電路，僅使用7顆功率開關元件，即可達成4種降壓模式(Vout/Vin=1；Vout/Vin=1/2；Vout/Vin=2/3；Vout/Vin=1/3)。傳統型交換式電容電路在3~4種降壓模式下，至少需要8~9顆功率開關元件，本架構在4種降壓模式下，可節省1~2顆功率開關，大幅地縮小晶片面積，進而降低了系統開發成本。本文提出的交換式電容電路，使用了世界先進0.4um 2P4M BCD高壓製程技術，將功率開關、控制電路和大多數電阻電容元件，整合到高壓積體化IC，降低了系統的體積與重量。本架構之輸入電壓為直流12~36V，透過4種降壓模式切換，使輸出電壓能維持12V，其驅動電流為0~400mA，最佳效率>90%，可適用LED driver (MR16)，並同時擁有數位PWM及0~10V類比調光功能。
關鍵字：直流/直流轉換器、交換式電容電路、功率開關、降壓、調光。
Abstract
In this paper,
DC/DC converter without magnetic elements and electrolytic capacitors is proposed,
it is a novel on-chip low-cost multi-modes switched capacitor, it only uses 7
power switches to achieve 4 step-down modes (Vout/Vin=1；Vout/Vin=1/2；Vout/Vin=2/3；Vout/Vin=1/3). The conventional switched capacitor at least needs 8~9 power switches to
achieve 3~4 step-down modes. The proposed switched capacitor can save 1~2 power
switches in 4 step-down modes, that could decrease the chip size, the
development cost may be reduced. The proposed switched capacitor has been
fabricated with vanguard 0.4um 2P4M
BCD processes, the power switches, controller circuit, and most resistors and
capacitors are integrated in a chip, that reduces the weight and volume of the
system. In the proposed switched capacitor, the input voltage is 12~36V, the output
voltage can be maintained at 12V by switching 4 step-down modes. The driving
current is 0~400mA, the maximum efficiency is higher than 90%. The proposed
switched capacitor has digital PWM and 0~10V analog dimming capabilities, so it
can be suitable for LED driver (MR16).
Keywords：DC/DC converter, switched
capacitor, power switches, step-down, dimming.- Link:
http://tpece2012.ee.nthu.edu.tw/static?target=home
- Conference papers (會議發表):
龔哲民,黃忠民,黃祺峻,陳威銘, 適用於LED驅動電路之新型低成本多模式晶片整合型交換式電容電路 「電力電子研討會」,(第十一屆),pp.PID089, 20120911
- download:
沒有留言:
張貼留言