what is pwr_good for in bp?

Question

Do it yourself

I am quietly making a laboratory power supply, from an old 230 quilted jacket. Literally now I ran into a problem: I don’t know what to do with the power good wiring in the power supply unit (orange). A cursory googling didn't come up with an answer. So, where to pick it up and what is it for?

Answer 1

It is needed to inform the powered device that the voltages have been established and you can start working.
In a homemade laboratory PSU, it is likely to be left hanging in the air.

Answer 2

the value of the PWRGOOD signal (32) is sampled (step 42). In the case that the value is "0" (indicating that the system is in shutdown state), no operation is required and the system reverts to idle state (44), awaiting an event. If, on the other hand, the value in step (42) is "1", indicating that the poweris on, then a PWRBTN# signal ("0") is triggered (43) and fed to the ACPI module ((26) in Fig. 2). The latter, depending upon its operational state, will trigger an ONCTL# signal de-asserted. In the common case when the system is functional this will bedone via a call to the CPU (21) that will handle the shutdown process and will give the proper turn-off command. When the system is not functional this will be done by the ACPI state machine directly after 4-seconds.
www.patentgenius.com/patent/7240222.html

Answer 3

Here is a good description of the principle of using power good.

Answer 4

It's just "duty" 5V to the motherboard. When there is 220 on the PSU, there should be 5 volts on the orange wire.