ABSTRACT
While the large passive elements of power converters are in the way of converging walls of shrinking cell phones and cameras, the new capabilities these devices flaunt are creating additional burdens and making it difficult to meet specifications without even bigger elements. Active circuits that enhance the effects of passive elements will allow power converters to handle larger loads and get smaller at the same time. This paper presents a predictive inductor multiplier circuit that amplifies the effective inductance in a Buck converter. The output ripple of the simulated converter is so small that the converter appears to have an inductance thirty-eight times the value actually used. Compensating for small inductors introduces new power losses, but it is discovered that linear regulators and faster switching converters can be even less efficient
- H. Goldstein, "Mike Villas's World," IEEE Spectrum, vol. 41, no. 7, pp. 45--48, July 2004. Google ScholarDigital Library
- P.E. Ross, "Managing Care Through the Air, Remote Health Monitoring," IEEE Spectrum, vol. 41, no. 12, pp. 26--31, Dec 2004. Google ScholarDigital Library
- E. Bayer and H. Schmeller, "A High Efficiency Single-Cell Cascaded Charge Pump Technology-The Competitive Alternative to Inductive Boost Converters," in 32nd Annual Power Electronics Specialists Conference, vol. 1, pp. 290--295, 2001.Google Scholar
- H.S. Chung, "Design and Analysis of a Switched-Capacitor-Based Step-Up DC-DC Converter With Continuous Input Current," IEEE Trans. on Circuits and Systems I, vol. 46, no. 6, pp. 722--730, June 1999.Google ScholarCross Ref
- R. Chebli and M. Sawan, "A CMOS High-Voltage DC-DC Up Converter Dedicated For Ultrasonic Applications," 4th IEEE International Workshop on System-on-Chip for Real-Time Applications, 2004, pp. 119--22. Google ScholarDigital Library
- T.R. Ying, W.H. Ki, and M. Chan, "Area-Efficient CMOS Charge Pumps for LCD Drivers," IEEE Journal of Solid-State Circuits, vol. 38, no. 10, pp. 1721--1725, Oct 2003.Google ScholarCross Ref
- S. Orr, "Integrated Magnetics Shrinks DC-DC Converter," EE Times, May 25, 2004.Google Scholar
- Z. Hayashi, Y. Katayama, M. Edo, and H. Nishio, "High-Efficiency DC-DC Converter Chip Size Module With Integrated Soft Ferrite," IEEE Transactions on Magnetics, vol. 39, no. 5, Sep 2003.Google ScholarCross Ref
- T. Sato, M. Hasegawa, T. Mizoguchi, and M. Sahashi, "Planar Inductors for Very Small DC-DC Converters," Telecommunications Energy Conference 1991. pp. 709--713.Google Scholar
- J. Park and M.G. Allen, "Ultralow-Profile Micromachined Power Inductors with Highly Laminated Ni/Fe Cores: Application to Low-Megahertz DC-DC Converters," IEEE Trans. on Magnetics, vol. 35, no. 5, pp. 3184--3186, Sep 2003.Google ScholarCross Ref
- R.H.S. Riordan, "Simulated Inductors Using Differential Amplifiers," Electronics Letters, vol. 3, no. 2, pp. 50--51, Feb 1967.Google ScholarCross Ref
- T. Deliyannis, Y. Sun, and J.K. Fidler, Continuous-Time Active Filter Design, Boca Rotan, Florida: CRC Press LLC, 1999, ch. 3.Google Scholar
- A. Makharia and G.A. Rincón-Mora, "Integrating Power Inductors onto the IC-SOC Implementation of Inductor Multipliers for DC-DC Converters," in Proc. 28th Annual Conference of the IEEE Industrial Electronics Society 2002, vol. 1, pp. 556--561.Google Scholar
- Y.H. Oh and S.G. Lee, "An Inductance Enhancement Technique and Its Application to a Shunt-Peaked 2.5 Gb/s Transimpedance Amplifier Design," IEEE Trans. On Circuits and Systems II, vol. 51, no. 11, pp. 624--628, Nov. 2004.Google ScholarCross Ref
- D.C. Hamill and O.T. Toh, "Analysis and Design of an Active Ripple Filter for DC-DC Applications," in Proc. Of Applied Power Electronics Conference and Exposition 1995, vol. 10, pp. 267--273.Google Scholar
- L.E. LaWhite and M.F. Schlect, "Active Filters for 1-MHz Power Circuits with Strict Input/Output Ripple Requirements," IEEE Transactions on Power Electronics, vol. PE-2, no. 4, Oct 1987.Google ScholarCross Ref
- P. Midya and P.T. Krein, "Feed-forward Active Filter for Output Ripple Cancellation," International Journal of Electronics, vol. 77, no. 5, pp. 805--818, 1994.Google ScholarCross Ref
Index Terms
- A novel predictive inductor multiplier for integrated circuit DC-DC converters in portable applications
Recommendations
Monolithic Low-EMI CMOS DC–DC Boost Converter for Portable Applications
This brief presents the design of a novel low-electromagnetic interference DC–DC step-up (boost) switching converter for portable applications. The converter can switch between pulsewidth modulation and pulse-frequency modulation modes for different ...
A monolithic buck DC-DC converter with on-chip PWM circuit
A monolithic CMOS voltage-mode, buck DC-DC converter with integrated power switches and new on-chip pulse-width modulation (PWM) technique of switching control is presented in this paper. The PWM scheme is constructed by a CMOS ring oscillator, which ...
Comments