The necessarity of the purified power supply in the hospital

The improvement of the electrical power supply is now from the ordinary one to the purified one.We think,the automaticalized,digitalized,integrated and civilized medical instruments all need to use the purified-power supply.We analyzed the troubles of electrical energy from the interference of the common-mode and different-mode also from the un-balanced of the tri-phasic voltage.We analyzed the effection and defection to the different medical instrument and information system from all these troubles.Meanwhile,we compared the technical data of the ordinary voltage-regulaˉtor with the purified-power supply.We discussed the necessity of the purified-power supply for the medical instruˉment.