Paul Hilton wrote:
> The very first ones that I actually read the tech sheets on can have
> an AC or DC input, the output is described as AC only. Can an AC SSR
> be used for DC outputs?
The most common SSRs have a DC input and an AC output. They are used in
lots of applications throughout homes and buildings to control AC
equipment using low-voltage DC signal lines. The most common use is
probably to turn on a home furnace based on a signal from a thermostat.
To the best of my knowledge, you cannot easily use an SSR designed for
AC loads to control a DC load. Moreover, even if it worked, you would
still have to worry about how fast you could switch the SSR. Since most
AC SSRs are simply turning things on or off, over the course of many
minutes, they won't work for controlling a DC motor a few thousand times
per second.
Even cheaper SSRs that are designed for DC loads might not allow a
sufficient switching speed to be useful as a PWM speed controller. Dr.
Sommer can provide you with the exact things to look for in the spec
sheet when trying to find the ultimate cheap, but effective, SSRs for
our purposes.
Frank P.
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