Patent ID: 6057668
Filing Date: 2000-05-02
Classification: H02J

Abstract:
A charging device for charging the battery of a mobile phone, comprisinga charging stage having a primary iron core, a primary coil around said primary iron core and functioned to convert electrical energy into magnetic energy, a power supply connected to said primary coil for providing the electrical energy for charging, and a controller connected to said power supply to control the amount of electrical power provided by said power supply;an induced-type power supply having a secondary iron core, a secondary coil around said secondary iron core and functioned to convert said magnetic energy linked from said primary iron core to electrical energy for charging the battery to be charged, a rectifying device connected to the output of said secondary coil to function as power supply to battery, a sensor connected to the output of said rectifying device to detect a charging state of said battery;an information transmitter functioned to transmit said charging state detected by said sensor to said controller through said secondary iron core, whereby said controller can control the electrical energy provided by said power supply;wherein said sensor comprises a current sensor in serial connection with said rectifying device and said battery, and a voltage sensor in parallel connection with said battery, and said information transmitter generates a short-circuit signal by short-circuiting the periodic signal sent from the said charging stage for a certain duration, thus indicating the charging state to said charging stage.