| 摘要 |
A battery protection circuit (10) for an external battery pack (14) has a switch (80) for controlling connection of a battery output to a load, and a detector for detecting a resistance at a load output terminal. A first comparator (50) compares the detected resistance to a predetermined maximum value, and a second comparator (54) compares the detected resistance to a predetermined minimum value. If the detected resistance is in the range between the minimum and maximum values, a control signal (42) is produced to enable connection of the battery output to the load. If the detected resistance is outside the range, the switch (80) is disabled and no current can flow to the load.
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