Energy Harvesting from Current Transformer with Super Capacitor for Fault Indicator Reference Design


Design files


Power management for the energy harvesting, energy buffering and back-up power is a key challenge in the fault indicator design. The TIDA-01385 introduces a circuit about harvesting energy from a current transformer for the system load of a fault indicator while storing the extra energy in a super capacitor. A primary Li/SOCl2 battery is used as back-up power to extend the fault indicator operating time after the power grid fails. With input current from 3mA to 2A, the reference design provides a stable 3.6V to system load within two seconds.

  • Harvest energy from current transformer
  • Automatic charging super capacitor with extra energy
  • Providing stable output voltage within two seconds
  • Super capacitor full charged protection
  • Ultra-low input boost converter for utilizing maximum supercapacitor stored energy
Output voltage options TIDA-01385.1
Vin (Min) (V) .9
Vin (Max) (V) 3.6
Vout (Nom) (V) 3.6
Iout (Max) (A) .05
Output Power (W) .18
Isolated/Non-Isolated Non-Isolated
Input Type AC
Topology Boost- Synchronous
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Design files & products

Design files

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TIDUD59.PDF (671 K)

Reference design overview and verified performance test data

TIDRR89.PDF (112 K)

Detailed schematic diagram for design layout and components

TIDRR90.PDF (29 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRR91.PDF (92 K)

Detailed overview of design layout for component placement

TIDRR93.ZIP (1037 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRR92.PDF (358 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS61021A3-A Boost Converter with 0.5-V Ultra Low Input Voltage

Data sheet: PDF | HTML

TLV3492Dual Nanopower Push-Pull Output Comparator

Data sheet: PDF | HTML
N-channel MOSFETs

CSD13202Q212-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 9.3 mOhm

Data sheet: PDF | HTML
P-channel MOSFETs

CSD25310Q2-20-V, P channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 23.9 mOhm

Data sheet: PDF | HTML
Shunt voltage references

ATL4312.5-V low-IQ adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Energy Harvesting From Current Transformer Reference Design Jun. 05, 2017
Application note Designing with the ATL431LI Nov. 27, 2018

Related design resources

Reference designs

TIDA-00998 Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design

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