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  • DC Voltage Regulator

  • Created: May 27, 2016

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Summary

A voltage regulator usually found in devices that the need of voltage stability is relevant. It is intended to maintain a constant voltage level for sensitive components like microcontroller. Depending on an application, the design may differ from an electromechanical mechanism or electronic components to regulate one or more AC or DC voltages.


This circuit employs the MCP6002 power op amp; it is a dual general-purpose op amp offering rail-to-rail input and output over the 1.8 to 6V operating range. The op amp A, functions as a square wave generator and the op amp B, functions as a simple comparator. A reference voltage is fed to the inverting input of the op amp B via a potentiometer RP1. The output of the op amp B is a square wave signal with a constant frequency of around 200Hertz. This has a variable pulse width from 0 to 100% adjusted by the potentiometer RP1. The transistor QT1 works as the regulator by switching a relatively high current with a maximum of 5 amperes.


This project design produces a regulated DC output voltage that can be used to control a speed of a motor, a pump, a lamp or an LED brightness, etc. This can be used in any application that uses a regulated DC voltage with pulse width modulation (PWM).

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