Reverse Polarity Protection for system equipped with +/-15V

[powersys]

For a single polarity power supply, a diode is usually inserted in series with the power supply to protect the system from being damaged due to reverse polarity.

How do we protect the system powered by dual polarity supplies (i.e. +/-15V, see below) from being damaged by reverse polarity (or wrong connections e.g. cases 2~6 below, assuming Case-1 is the normal/correct connection)?

 

[barry]

Several approaches:

1) Don't let idiots wire this up.
2) Use a polarized connector to stop the idiots in #1.

If you put series diodes on the +15 and -15 inputs you can protect against cases 2,5 and 6.
Without adding crowbars, etc., you can't protect against cases 3, 4 , since the relative polarity will be correct, but you will have an overvoltage.

Barry

 

[kak111]

Can you put the values for components, this is only principle idea,
or is there something wrong.
(I have not tested this.)

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