No point of contact charging system

  • US 7,443,135 B2
  • Filed: 04/11/2005
  • Issued: 10/28/2008
  • Est. Priority Date: 03/21/2005
  • Status: Active Grant
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First Claim
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1. A non-contact charging system having a battery pack (B) charged by an induced electromotive force generated from a non-contact charger (A) supplied with power, wherein the non-contact charger (A) comprises:

  • an electromagnetic wave filter (100) connected to a power input terminal to block electromagnetic waves caused by Alternating Current (AC) power;

    a primary rectification circuit (110) for rectifying the AC power, to Direct Current (DC) power;

    a flyback converter (110

    ) for storing power transferred from the primary rectification circuit (110) while a contained transistor is turned on, and applying an input voltage to a gate driver (160), a central processing unit (180) and applying a driving voltage to a series resonance type converter (120) when the contained transistor is turned off;

    a current detection unit (170) interposed between the flyback converter (110

    ) and the series resonance type converter (120) to detect a variation in current resulting from an approach of the battery pack (B) to a non-contact charging pad, and outputting a comparison current depending on the variation in current;

    the central processing unit (180) for detecting the approach of the battery pack (B) using the comparison current output from the current detection unit (170), controlling the gate drive (160) according not only to whether the battery pack (B) approaches but also to the current of a temperature protection circuit unit (183) to stop the switching of the gate drive (160) when abnormal operation occurs or the temperature of a foreign object placed on the non-contact charging pad exceeds a predetermined temperature;

    the gate driver (160) for outputting gate signals under the control of the central processing unit (180);

    the series resonance type converter (120) for adjusting the waveforms of voltage and current applied to a primary core unit (130) in response to the gate signals input from the gate driver (160); and

    the primary core unit (130) switched by the series resonance type converter (120) to generate the induced electromotive force,wherein the battery pack (B) comprises;

    a secondary core unit (210) configured to induce power through the primary core unit (130);

    a secondary rectification circuit unit (200) coupled to a coil (Scoil1) of the secondary core unit (120) to rectify the induced power;

    a charging control unit (230) comprising a charging adjustment circuit (230a) for supplying a fuel gauge (230b) with power rectified by the secondary rectification circuit (200), and applying voltage to a Radio Frequency Identification (RFID) control unit in response to the output of the secondary rectification circuit (200), and the fuel gauge (210b) for supplying a battery BAT through a protection circuit (240) with power supplied from the charging adjustment circuit (230a), and generating charging state information and periodically records the information while monitoring the charging state of the battery BAT; and

    a protection circuit unit (240) coupled between the charging control unit (230) and the battery (BAT) to control whether to perform charging or discharging depending on a charged state of the battery (BAT), anda shield plate (260) having a film shape, interposed between the secondary core unit (210) of the battery pack (B) and a battery case (250), the protection circuit unit (240) being surrounded by a shield member (241).

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