Abstract

Efficient current, voltage, and power sensing are critical blocks for power management, switching regulators, maximum power point tracking (MPPT) circuit, and motor control. This paper presents a standard CMOS and low-power current-to-digital converter (IDC) that senses the current flowing at high-voltage nodes. The proposed sensor uses a CMOS-switched capacitor circuit to sense a dc-dc converter output current and gives digital output without an analog-to-digital converter (ADC), or the need for high-voltage technologies. Compared to the resistor-based current-sensing methods that require current-to-voltage circuit, gain block, and an ADC converter, the proposed sensor is a low-power integrated circuit that achieves high resolution, lower complexity, and lower power consumption. The IDC circuit is fabricated on a 5 V, 0.7 μm, and three metal CMOS technology and occupied less than 10% area (1 mm2 area) compared to other sensors. It consumes 18 mW that is less than 40% power consumed by other sensors, and its current measurement error is below 0.4%. The proposed IDC circuit has been characterized as standalone and with a boost dc-dc regulator and MPPT for photovoltaic systems.

Original languageEnglish (US)
Article number7464308
Pages (from-to)2180-2188
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume32
Issue number3
DOIs
StatePublished - Mar 1 2017

Keywords

  • Current sensor
  • data converter
  • dc-dc converter
  • maximum power point tracking (MPPT)
  • photovoltaic (PV)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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