Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches




Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, November 30, 2017 07:43 AM

Master Category List - Dave's Circuits

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server


More 

Photovoltaic Circuits, Rectifier Circuits

Ideal Blocking Diode Circuit for Photovoltaic Solar Panels


Most photovoltaic solar panels are used to charge a battery during the daytime. Nearly all panels come equipped with a blocking diode.  The diode prevents DC current from flowing backwards from the battery bank into the panel at night.  The usual blocking device of choice is a schottky diode with a typical 0.5v voltage drop.  In some large panels, which can often source over 4 Amps of current, the power loses due to this voltage drop can add up.  As an example a 4KW solar power system made of 20 200 watt panels will dissipate some 40 watts of power in the diodes.  The circuit below uses a new high voltage ideal diode IC from Linear Technology.  The LTC4357 contains all the circuitry needed to control an external n-channel FET.  The circuit shown below performs a standard diode function with a much lower 0.06 voltage drop at 4 Amps.  When current tries to flow in the other direction, the IC turns off the FET, blocking the current.

The LTC4357 contains a charge pump circuit to provide the needed gate-source voltage for the n-channel device.  An n-channel is used since they tend to have much lower channel resistances and higher voltages than p-channel parts.  The 100v device picked has an on resistance of only 0.015 ohms.  The circuit is good for over 10 Amps but I would recommend that the FET be mounted to a heat sink if the current exceeds 8 Amps.

Click on Drawing Below to view PDF version of Schematic

CircuitIdeal Blocking Diode for Solar Panels

More  Photovoltaic Circuits, Rectifier Circuits

List of Dave's Circuits
Dave's Circuits with Descriptions
Dave's Circuits by Category

eMail David A. Johnson, P.E. about this circuit

 


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
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  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 


 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.