Patent ID: 7898213
Filing Date: 2011-03-01
Classification: H02J

Abstract:
1. A multi-battery charger for at least one rechargeable battery having a first and a second battery terminal, comprising: a charger case comprising at least three electrically neutral charging terminals as spacedly provided thereon as multi-contact terminals of said charger case, and an electric input terminal adapted for electrically connecting with an external DC power source; and a multi-battery charging module, which is provided in said charger case to electrically communicate with said electrically neutral charging terminals, and comprises: a recharging circuitry having a positive recharge terminal and a negative recharge terminal adapted for electrically connecting with said battery terminals in correct polarity through said charging terminals for properly recharging said rechargeable battery; and a polarity detection circuitry electrically connected with said recharging circuitry to accurately detect a positive polarity and a negative polarity of said first and said second battery terminal when said first and said second battery terminals are electrically connected with at least two of said charging terminals, in such a manner that when a correct polarity of said first and said second battery terminals is determined, said recharging circuitry is activated to properly recharge said rechargeable battery, wherein said recharging circuitry is adapted for electrically connecting to said first battery terminal and said second battery terminal through said charging terminals for recharging said rechargeable battery, in such a manner that when said battery is properly recharged, a potential difference between said positive recharge terminal and said negative recharge terminal follows a predetermined reference voltage pattern, wherein said polarity detection circuitry comprises a central processing module electrically communicated with said recharging circuitry to control and monitor an operation thereof; and a terminal rerouting circuitry electrically communicating between said recharging circuitry and said central processing module, in such a manner that when said first and said second battery terminals are electrically connected with said charging terminals, said terminal rerouting circuitry electrically connects one of said charging terminals to said negative recharge terminal of said recharging circuitry, and another of said charging terminals to said positive recharge terminal of said recharging circuitry for attempting recharging of said battery by said recharging circuitry and producing a recharging voltage pattern between said positive and said negative recharging terminal, wherein when said recharging voltage pattern substantially departs from said predetermined reference voltage pattern, said terminal rerouting circuitry is electrically controlled by said central processing module to electrically reconnect said charging terminals with said negative and said positive recharge terminals of said recharging circuitry, until said predetermined reference voltage patterns occurs in said recharging circuitry so as to ensure that said battery is properly recharged in correct polarity.