Boost Converter Optimizes Motor Performance In Battery-Powered Applications
by Jared Becker, Texas Instruments, Detroit, Mich. and Donald Schelle, Texas Instruments, Cambridge, Ont., Canada , How2Power Today, Aug 16 2018
Focus:
Motor speed is proportional to the voltage applied to the motor, so as a system’s battery
voltage decreases over time, the speed of the motor inherently decreases. One way to combat
decreasing battery voltage is to use a dc-dc boost converter. This article presents a solution
based on the TPS61175 boost converter IC. The example system discussed here consists of a 12-V,
1-W to 3-W motor powered off of 12-V system power, which is derived from 8 AA batteries.
Details of boost converter circuit operation and selection of key supporting components are
explained, experimental results are presented, and tradeoffs of using a boost converter are
noted.
What you’ll learn:
- How to maintain constant motor speed in battery-based applications by using a boost converter
- How to boost battery voltage in low-power (1 W to 3 W) motor applications
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