Low-power/low-voltage integrated CMOS sense resistor-free analog power/current sensor compatible with high-voltage switching DC-DC Converter

Shrikant Singh, Debashis Mandal, Bertan Bakkaloglu, Sayfe Kiaei

Research output: Contribution to journalArticle

Abstract

A sensor circuit to measure the output power of a dc-dc boost for photo-voltaic (PV) maximum power point tracking (MPPT) application is presented. The proposed approach obviates the need for a series current sense resistor and a complex current/voltage digitization and multiplication circuitry required for calculating power. Thereby, this technique does not require analog multipliers, analog-to-digital converters, digital signal processor, and FPGA, thus reducing the bill of material, silicon area, and power consumption of the overall system. Additionally, it provides the dc electrical isolation between the high output voltage of the boost converter and the low-voltage integrated CMOS power sensor circuit. The proposed power sensor circuit is implemented using a switched capacitor differentiator and a voltage-to-time converter. This approach results in lower complexity, lower silicon area, lower power consumption, and lower component count for the overall PV MPPT system. Designed in a 180-nm CMOS process, the circuit can operate with a supply voltage of 1.8 V. It achieves a power sense accuracy of 7.6%, occupies a die area of 0.0519 mm 2 , and consumes a power of 0.748 mW.

Original languageEnglish (US)
Article number8661754
Pages (from-to)2208-2218
Number of pages11
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume66
Issue number6
DOIs
StatePublished - Jun 1 2019

Keywords

  • Boost converter
  • current sensor
  • DC-DC converter
  • differentiator
  • isolated sensing
  • lossless sensing
  • maximum power point tracking
  • MPPT
  • photovoltaic
  • power sensor
  • solar cell
  • switched capacitor
  • switching regulator
  • voltage to time converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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