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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th December 2004, 11:40 AM   #1
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Default ClassD with Solid State Relay?

I just got back from local electronic market. I saw a "Solid State Relay".
ClassD PWM type power amp uses final transistor as a switch only, on and off with varying width. A relay does the same thing, only on and off.
I dont know the spec of this SS relay, but if its capable of 500khz, I think it can be made classD power amp, with big supply rail and big current (big amp).
Does anyone has tried it before?
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Old 24th December 2004, 10:32 PM   #2
IVX is offline IVX  Russian Federation
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hi lumanauw,
Usually solid state relays is slow too much (several mS), but you can use other optical solution for the class D- TLP250 (or like), which 1000 times faster vs SS relay.
Best regards,
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Old 27th December 2004, 06:07 AM   #3
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They are usually made to switch 60/60 Hz mains and include things like zero crossing detection.
You can't use them for class-d amps.
They are a nice thing however for remotely switching-on PSUs etc.


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Old 29th December 2004, 11:40 PM   #4
subwo1 is offline subwo1  United States
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H11Fx is a pretty cool optocoupler which may be worthwhile to tinker with as well.
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