Trick A BJT-Based Converter Into Starting At Only 250 mV DC

by Louis Vlemincq, transmission specialist, Belgacom, Evere, Belgium, Electronic Design, Jun 26 2008

Focus:
A boost converter based on a silicon bipolar junction transistor (BJT) power switch operates from voltages as low as 250 mV. Keys to circuit performance include a third wire connected upstream of the power switch to kick start operation and use of a current transformer in the feedback path.

What you’ll learn:

• How to start a BJT-based power converter at 250 mV
• How to operate a power converter off of energy-harvesting power sources

Notes:
ED's Ideas For Design

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