What is an H-bridge?


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
An h-bridge is a way of reversing the current flow through a load. Four switches used.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
First simplification/optimization: use SPDT switches on each side. Two switches used.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
This speed controller: DPDT relay, plus one SPST switch on the ground leg. Two switches used.

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