Wireless charging device for charging a plurality of wireless power receiving apparatus and charging method thereof

A method for wireless charging, comprising:

• providing at least one transmitting-end ferrite core and at least one transmitting-end coil, the transmitting-end ferrite core comprising a bottom plate and two upright plates to form a U-shaped structure, the transmitting-end ferrite core defining a charging space therein, wherein the wireless charging device has a plurality of transmitting-end ferrite cores including at least one inner transmitting-end ferrite core and an outer transmitting-end ferrite core, the inner transmitting-end ferrite core is stacked on the outer transmitting-end ferrite core, the inner transmitting-end ferrite core has two upright plates and the outer transmitting-end ferrite core has two upright plates longer than the upright plates of the inner transmitting-end ferrite core;
• placing at least one wireless power receiving apparatus into the charging space, each of wireless power receiving apparatus having a receiving-end coil and a receiving-end ferrite plate, the receiving-end ferrite plate of the wireless power receiving apparatus being vertical to the upright plates of the transmitting-end ferrite;
• and
• conducing electrical current flowing through the transmitting-end coil to generate an electromagnetic field in the charging space, the electromagnetic field via the two upright plates goes through each of the receiving-end ferrite plates to form an electromagnetic loop, whereby each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field.

A wireless charging device capable of wireless charging a plurality of wireless power receiving apparatus, the wireless charging device comprising:

• a transmitting-end ferrite core comprising a bottom plate and an upright plate surrounding the bottom plate to form a barrel-shaped structure with an opened side, the transmitting-end ferrite core defining a charging space therein to accommodate one or more wireless power receiving apparatus;
• and
• a first transmitting-end coil arranged on an inner face of the upright plate;
• wherein each of the wireless power receiving apparatus has a receiving-end coil and a receiving-end ferrite plate and the plurality of wireless power receiving apparatus are arranged in the charging space;
• when electrical current flows through the first transmitting-end coil to generate an electromagnetic field in the charging space, each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field.

A method for wireless charging, comprising:

• providing a transmitting-end ferrite core and a first transmitting-end coil, the transmitting-end ferrite core comprising a bottom plate and an upright plate surrounding the bottom plate to form a barrel-shaped structure with an opened side, the transmitting-end ferrite core defining a charging space therein, the first transmitting-end coil arranged on an inner face of the upright plate;
• placing one or more wireless power receiving apparatus into the charging space, each of wireless power receiving apparatus having a receiving-end coil and a receiving-end ferrite plate;
• and
• conducing electrical current to the first transmitting-end coil to generate an electromagnetic field in the charging space, each of the receiving-end coils generating a charging electrical current induced by the electromagnetic field.