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Old 01-25-2012, 06:01 PM   #1
bendead
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SSR wiring

Hello

I'm going to start a peltier waterchiller project, I just have a question about electronic

Could anybody confirm this SSR wiring :



Thanks

Benjamin
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Old 01-26-2012, 08:55 AM   #2
mindchill
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Most solid state relays can only switch at very low frequency's. < 1000hz, so you will need to check that your pwm signal is in this range

Also pc pwm fan controllers are an open collector circuit and not a true pwm, but I think will still work if wired correctly.

I also personally would take the tec to ground from the ssr but either way is fine.
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Old 01-27-2012, 06:28 PM   #3
bendead
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Thanks for you answer mindchill

I found a Power-io relay : http://www.power-io.com/products/hdd.htm
75 amps at 20Khz, but i will keep looking for a more powerful one.
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Old 01-27-2012, 08:31 PM   #4
mindchill
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Quote:
Originally Posted by bendead View Post
Thanks for you answer mindchill

I found a Power-io relay : http://www.power-io.com/products/hdd.htm
75 amps at 20Khz, but i will keep looking for a more powerful one.
Nice find, That ssr uses an IGBT transistor which unlike other solid state relays has a nice switching frequency range, but it may still be a little too slow. I think 4 pin fan pwm has a nominal frequency of about 25khz
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Old 01-28-2012, 06:31 AM   #5
bendead
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Thanks mindchill

I contacted Aquacomputer, they say that the AQ5 is 16Khz so I hope I will be fine.
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Old 01-29-2012, 01:12 PM   #6
mindchill
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Originally Posted by bendead View Post
Thanks mindchill

I contacted Aquacomputer, they say that the AQ5 is 16Khz so I hope I will be fine.
odd that they use a pwm signal in that frequency range but your right, it looks like the aqua 5 does use a true pwm signal to run led's etc at 16khz. I've had some issues in the past running tec's off a pwm signal in the audible range (<20khz). I end up with cap noise (high pitched whine) from the power supply in these ranges.
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