USB adapter plug can't work for PS3?

[Don86]

It seems like I can only charge the controller on the usb port of my PS3 with the USB cable given with the PS3. It doesn't seem to work anywhere else and I feel it's no point getting just a longer cable..

I got a USB adapter power plug but I can't charge the controller and I have to discover it the hard way during a game. -_-"

Anyone can recommend any usb charger adapter plug for my PS3(default) controller?

Thanks again.