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Last Updated on: Thursday, November 30, 2017 07:43 AM

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Underground Gate Opener

 

Problem:  Provide power to mechanical gates located opposite ends of a looping branch tunnel.  The gate was required to open and close perhaps only 2 times each month. The gates were set to open and then close again at ten minutes intervals.

Solution:  Use a wind generator.    But, the low wind speed could mean that the voltage from the wind generator might be slightly lower than the 14v needed to keep the battery charged.

Motorized Swing Gate

The addition of a voltage doubler boost circuit to the three phase rectifier inside the generator solved the problem.  The complete generator circuit is shown below.  The circuit provides a fixed 14v supply, current limited to 100ma.

 
 
 
Circuit below is a LOW POWER 12V BATTERY CHARGER

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DC Magazine, January 2011, Page 7:  Underground Gate Opener


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