COMBINED TRANSFORMER, AND NON-CONTACT BATTERY CHARGING DEVICE USING THE SAME

摘要

A non-contact battery charging device is for charging a touch pen using a combined transformer. The combined transformer includes a primary winding wound around a tubular insulating spool secured in a receptacle of a pen stand and allowing insertion of the touch pen, and a second primary wound around a magnetic core coaxially secured in the touch pen. A section of the magnetic core is coaxially located in the spool when the touch pen is inserted into the receptacle and extends through the spool. A charger having the magnetic core and the secondary winding is operable to supply a charging voltage to a rechargeable battery in the touch pen based on an input voltage across the primary winding.

主权项

1. A combined transformer for use in a battery charging device for charging a touch pen, said combined transformer comprising:
a tubular insulating spool allowing extension of the touch pen therethrough; a primary winding wound directly onto said tubular insulating spool; an elongate magnetic core used to be coaxially secured in the touch pen, a section of said magnetic core being coaxially located in said tubular insulating spool when the touch pen extends through said tubular insulating spool to be charged such that said primary winding coaxially surrounds said section of said magnetic core; and a secondary winding used to be disposed in the touch pen and wound directly onto said magnetic core, said secondary winding being coaxial with said primary winding when the touch pen extends through said tubular insulating spool such that said primary winding cooperates with said primary winding and said magnetic core to serve as a transformer.