Thanks for the comments!
How can I be sure that I won't damage the power supplies by directly wiring the DC outputs together? I don't want to make smoke signals!
And note that I have this special feature that I don't want to draw any mains power at all while battery power is available, so I do need the 240V relay.
Rgds
Damon[ Parent ]
The DC/DC or the AC switching power converter if above its reference stop producing energy and in this case the DC/DC is the master and the AC is the slave,
The slave as a PWM supply will stop producing energy and goes dormant with a few milliwatts of power.
We have several PC connected this way for many years, in a close set up almost like yours.
Nando[ Parent ]
Damon [ Parent ]
The laptop mains adaptor is very good, and draws undetectably low power (I think << 2W) when it has no load.
Thus I am simplifying my design as you suggest and removing the mains transformer on the input side.
I am also connecting the OVs of the mains adaptor and 20V DC/DC converter supply together directly.
I am however still planning on switching between the mains adaptor and the DC/DC converter in the positive line with the relay. More details when I've built and tested...
