A small, low power boost regulator optimized for energy harvesting applications

Abstract

A small, low power bootstrapped boost regulator is introduced that can start up with an input voltage of 240 mV and achieve a maximum efficiency of 97 %. The proposed circuit uses two separate control schemes for startup and steady-state operation. A fixed-frequency oscillator is used to initially start up the circuit and raise the output voltage. Once the output voltage has reached a level adequate to bias the internal circuitry, a constant-on-time style hysteretic control scheme is used, which helps increase system efficiency compared to using a conventional pulse-width-modulated control scheme. While maintaining a high efficiency, the proposed circuit only requires three external components: two capacitors (input and output) and an inductor. The effectiveness of this approach is shown through Spectre simulation results.

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References

  1. 1.

    Kwon, D., Rincon-Mora, G. (2010). A single-inductor ac-dc piezoelectric energy-harvester/battery-charger ic converting ± (0.35 to 1.2 v) to (2.7 to 4.5 v). In: IEEE ISSCC Digest of Technical Papers, pp. 494–495. doi:10.1109/ISSCC.2010.5433867.

  2. 2.

    Ramadass, Y., Chandrakasan, A. (2009). An efficient piezoelectric energy-harvesting interface circuit using a bias-flip rectifier and shared inductor. In: IEEE ISSCC Digest of Technical Papers, pp. 296–297,297a. doi:10.1109/ISSCC.2009.4977425.

  3. 3.

    Carlson, E., Strunz, K., Otis, B. (2010). A 20 mv input boost converter with efficient digital control for thermoelectric energy harvesting. IEEE Journal of Solid-State Circuits 45(4), 741–750 doi:10.1109/JSSC.2010.2042251.

    Article  Google Scholar 

  4. 4.

    Ramadass, Y., Chandrakasan, A.(2010). A batteryless thermoelectric energy-harvesting interface circuit with 35 mv startup voltage. In: IEEE ISSCC Digest of Technical Papers, pp. 486–487. doi:10.1109/ISSCC.2010.5433835.

  5. 5.

    Doms, I., Merken, P., Mertens, R., Van Hoof, C. (2009). Integrated capacitive power-management circuit for thermal harvesters with output power 10 to 1000 μw. In: IEEE ISSCC Digest of Technical Papers, pp. 300–301,301a. doi:10.1109/ISSCC.2009.4977427.

  6. 6.

    Dayal, R., Parsa, L. (2011). Low power implementation of maximum energy harvesting scheme for vibration-based electromagnetic microgenerators. In: Proceedings of 26th IEEE APEC, pp. 1949–1953. doi:10.1109/APEC.2011.5744863.

  7. 7.

    Chen, P.H., Ishida, K., Zhang, X., Okuma, Y., Ryu, Y., Takamiya, M., Sakurai, T. (2010). 0.18-v input charge pump with forward body biasing in startup circuit using 65 nm cmos. In: Proceedings IEEE Custom Integrated Circuits Conference, pp. 1–4. doi:10.1109/CICC.2010.5617444.

  8. 8.

    Rao, Y., Arnold, D. (2011). Input-powered energy harvesting interface circuits with zero standby power. In: Proceedings of 26th IEEE APEC, pp. 1992–1999. doi:10.1109/APEC.2011.5744870.

  9. 9.

    Texas Instruments: Low input voltage synchronous boost converter with 1.3-a switches (rev. b) (2008). TPS61200 Datasheet.

  10. 10.

    Linear Technology: Ultralow voltage step-up converter and power manager. LTC3108 Datasheet.

  11. 11.

    Erickson, R.W., Maksimović, D. (2000). Fundamentals of Power Electronics, second edn. Norwell, Mass: Kluwer, pp. 24–45.

    Google Scholar 

  12. 12.

    Kao, Y.H., Liu, C.C., Kuo, H.C. (2007). Study of front end of cmos rfid tag with inductively-coupled broadband antenna. In: Asia-Pacific microwave conference, pp. 1–4. doi:10.1109/APMC.2007.4555011.

  13. 13.

    Banba, H., Shiga, H., Umezawa, A., Miyaba, T., Tanzawa, T., Atsumi, S., Sakui, K. (1999). A cmos bandgap reference circuit with sub-1-v operation. IEEE Journal of Solid-State Circuits 34(5), 670–674. doi:10.1109/4.760378.

    Article  Google Scholar 

  14. 14.

    Gilbert, B. (1996). Monolithic voltage and current references: theme and variations, pp. 269–352. Kluwer, Norwell, MA, USA.

    Google Scholar 

  15. 15.

    Texas Instruments (2007). Adaptive constant on-time (D-CAPTM) control study in notebook applications (2007). http://www.ti.com/lit/an/slva281b/slva281b.pdf. Accessed 23 July 2012.

  16. 16.

    Davis, S (2012). Constant on-time buck regulator ICs (2006). Electronic Design. http://www.electronicdesign.com/files/29/12253/12253.pdf. Accessed 26 July 2012.

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Correspondence to Zachary Nosker.

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Nosker, Z., Kobori, Y., Kobayashi, H. et al. A small, low power boost regulator optimized for energy harvesting applications. Analog Integr Circ Sig Process 75, 207–216 (2013). https://doi.org/10.1007/s10470-012-0017-3

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Keywords

  • Energy harvesting
  • Boost regulator
  • CMOS
  • Hysteretic control