H Bridge

[rave154]

Hi folks,

in my ongoing (aka never-ending lol ) quest.... i think i might need to use an H Bridge,

gotoluc posted a circuit on here that was constructed by someone else ( cant remember the name, sorry )...but my question is this...

does the H Bridge give you an "Actual" negative voltage as it flips from its positive voltage output......or does it simply flip the polarity/direction but still with an actual positive voltage?

ie does it flip from this...

+12V
|
)
) .<......coil
)
)
|
0 V

to this...

-12V
|
)
)
)
|
0 V

or , does it flip from this...

+12V
|
)
)
)
|
0 V

to this...

0 V
|
)
)
)
|
+12V

Thanks,

David. D

[gyula]

Hi David,

The answer is your second drawing, the polarity flips from

+12V
|
)
)
)
|
0 V

to this...

0 V
|
)
)
)
|
+12V

if you name the most negative point of your voltage source as zero. (it is actually the negative pole of your voltage source like a battery or a DC power supply but you reference it as zero). See here a good drawing on the switching states:
H-bridge - Wikipedia, the free encyclopedia

Gyula

[rave154]

Thanks gyula,

i kind of figured it was that one, i wa sgetting confused by the "terminology" of negative.