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Battery protection device
| Details |
Inventors: Mori, Iichiro;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Tso; Edward H.
Assistant Examiner: Toatley, Jr.; Gregory J.
Attorney, Agent or Firm: Jordan and Hamburg LLP
A control circuit detects the battery voltage E1 of the rechargeable battery, and the terminal voltage E2 across the input/output terminals that are connected to the rechargeable battery through a charge/discharge circuit. When the battery voltage E1 is lower than a charge-prohibiting voltage and higher than a discharge-prohibiting voltage, the control circuit turns on the first and second FETS, which are connected in series to the charge/discharge circuit. When the battery voltage E1 is higher than the charge-prohibiting voltage, the first FET is turned off, and when the battery voltage is higher than the terminal voltage, the first FET is turned on. When the battery voltage E1 is lower than the discharge-prohibiting voltage, the second FET is turned off, and when the battery voltage E1 is higher than the terminal voltage E2, the second FET is turned on. |
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DETAILED DESCRIPTION In view of the foregoing, it is an object of the present invention to provide a battery protection device that allows discharging when charging is prohibited and charging when discharging is prohibited, while ensuring that no large discharge current or charge current flows through the parasitic diodes of the switching elements.
To attain this and other objects, a battery protection device according to a first aspect of the present invention includes: a first switching means and a second switching means connected in series in a charge/discharge circuit connecting a positive electrode of a rechargeable battery to a positive input/output terminal and a negative electrode of the rechargeable battery to a negative input/output terminal; and a control means for detecting (i) a battery voltage between the positive electrode and the negative electrode of the rechargeable battery and (ii) a terminal voltage between the positive input/output terminal and the negative input/output terminal; turning on the first switching means when the battery voltage is below a charge-prohibiting voltage at which charging the rechargeable battery is stopped, and turning on the second switching means when the battery voltage is above a discharge-prohibiting voltage at which discharging the rechargeable battery is stopped; turning off and keeping off the first switching means when the battery voltage rises above the charge-prohibiting voltage, and turning on the first switching means when the terminal voltage becomes lower than the battery voltage; and turning off and keeping off the second switching means when the battery voltage drops below the discharge-prohibiting voltage, and turning on the second switching means when the terminal voltage becomes higher than the battery voltage.
In accordance with this first aspect of the present invention, the control means turns on the first and the second switching means when the battery voltage is within a suitable range of charge/discharge conditions below a charge-prohibiting voltage and above a discharge-prohibiting voltage, so that the rechargeable battery can be charged and discharged when connected to the input/output terminals
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