Soft start question

[AndrewT]

I never received a clear yes or no on this question and may have missed the answer somewhere.

A mains powered appliance can be either ClassII (double insulated) or ClassI, with mandatory PE protection that we are able to build.

Is your project mains powered?

 

[Less Opinion]

Yes.

 

[AndrewT]

Then you should be building it to ClassI standard with the PE wire connected directly to the Chassis.

And any exposed conductive parts should be connected to the protected chassis.

 

[troystg]

Silly question but can this be used with an SMPS power supply or is it strictly for linear power supplies? I want the momentary push button functionality but not the resistor / thermistor switched in and out of the mains. More of an off / on of the mains.

 

[Mooly]

SMPS are not usually used with a conventional soft start, in fact in some cases to do so could cause problems and even damage. The lower the AC voltage applied to an SMPS, the more current it will in fact draw as it attempts to keep the power delivered to the load constant.

SMPS do have a 'soft start' but it is integral with the electronics driving the switching elements and operates in a totally different way by controlling and restricing the duty cycle of the drive waveform.

 

[troystg]

Exactly, that's what I thought and why I asked to be sure.

So anyone know of a push button momentary switch solution for turning on amps?