access icon free Fast-response full-wave inductor current sensor for 10 MHz buck converter

A sense-FET-based inductor current sensor for a buck converter operating in 10 MHz switching frequency is reported in this Letter. The proposed sensor utilises an adaptive gm -boosting amplifier to maintain stable current sensing loop gain and bandwidth over a wide range of load current. Moreover, a mirrored source-degeneration output stage is introduced to further eliminate the bandwidth variation by loading change and achieves full-wave current sensing with smooth transition between the sensed peak and valley currents as the inductor is energised and de-energised. Simulation results show high sensing accuracy better than 96.8% with inductor current varying from 200 mA to 2 A. Furthermore, the settling time is <6 ns during the state transition between peak and valley current sensing with low-voltage spikes.

Inspec keywords: electric current measurement; inductors; switching convertors; sensors; HF amplifiers; field effect transistors

Other keywords: load current; mirrored source-degeneration output stage; sense-FET-based inductor current sensor; current sensing loop gain; low-voltage spikes; current 200 mA to 2 A; frequency 10 MHz; switching frequency; bandwidth variation elimination; fast-response full-wave inductor current sensor; adaptive gm-boosting amplifier; buck converter

Subjects: Other field effect devices; Sensing devices and transducers; Power electronics, supply and supervisory circuits; Current measurement; Amplifiers

References

    1. 1)
      • 2. Man, T., Mok, P., Chan, M.: ‘Design of fast-response on-chip current sensor for current-mode controlled buck converters with MHz switching frequency’. IEEE Conf. Electron Devices and Solid-State Circuits, Tainan, Taiwan, December 2007, pp. 389392, doi: 10.1109/EDSSC.2007.4450144.
    2. 2)
      • 4. Wu, C., Goh, W., Mao, W., et al: ‘A self biased full range current sensor for buck regulator’. Asia-Pacific Conf. Circuits Syst., Jeju, South Korea, January 2016, pp. 8790, doi: 10.1109/APCCAS.2016.7803903.
    3. 3)
    4. 4)
    5. 5)
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.4492
Loading

Related content

content/journals/10.1049/el.2017.4492
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading