DC power supplies in parallel?

[kramer5150]

just a quick question.... I have two identical laptop wall power packs spec'd at 15V DC, 4.5A. I can wire their outputs in parallel and essentially have an equivalent ~15V 9A supply right?

 

[bobo383]

That's right.

 

[poguy]

Are they regulated supplies? If so, put a diode in series with each so the regulators don't go nuts. Schottkey diodes are recommended due to lower voltage drop.

Plain, unregulated wall warts, go for it.

 

[chiption]

All the electronic equipment have tolerance.For example,a power pack output 15V,It maybe output 14.5~15.5V(you can read the spec,or measure it by multimeter). Suppose that power pack A output 14.5V,and power pack B output 15.5V,And if wire their's outputs in parallel......The output port of power pack A is input 15.5V,So It will be endure reverse voltage.
Maybe you can try to in series a high-power resistance or a 4.5A diode in each power pack.The value and power of resistence must be calculated by the tolerance of power pack.