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More  Voltage Regulators

Voltage Boost
Also see design in Circuit Solutions section

In this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.
The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit. The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3. Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. With the parts added, the output voltage increases by about 2 volts, boosting the voltage to 13.5 volts. This is just enough for many low voltage drop 12 volt regulators. Since a fair amount of current is pumped in and out of the 220uF caps, they should be the type rated for high ripple current or low
equivalent series resistance (ESR).

Voltage Regulator designed by David A. Johnson, P.E.

More  Voltage Regulators

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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.