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Monthly Archives: August 2013

Power soft switch

I want to describe here some schematics for a power switch. The soft power switch is in fact a electronic switch ( no relay, no moving parts) that can be used as a ON/OFF for a certain device.

The classical way to switch ON/OFF a device is to use a flip switch like this :

But this mechanical switch is expensive and can break  after a wile.

The other big disadvantage is that it require the mains AC line (supply line) to physically pass through that switch. So if for example you want to put the ON/OFF switch on the front panel of a device you have to go there with AC 110/220V mains. This can create problems (noise, interference…)

Beside this some people want a “fancy” ON/OFF function with only a simple push button. Like this:

So The switch is very small and can be integrated directly on the PCB board. Beside this there is very small voltages/current passing so there is no risk of electroshock.

Usually this type of application use DC voltages in the 3-24V domain. They are used often to start a board that has micro-controller or a small electronic device.

The following possibilities are shown below:

1: power_soft_switch

2:

power_soft_switch2

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