| 摘要 |
PROBLEM TO BE SOLVED: To attain a protection circuit during regeneration with simple circuitry, and to ensure safety of the peripheral devices without generating unwanted radio waves, radiation, or the like, for the peripheral devices. SOLUTION: A voltage division circuit 30 divides the voltage between the plus and minus sides of a power supply 11 using a secondary battery. A comparison circuit 33 compares the divided voltage from the voltage division circuit 30 with a reference voltage, and obtains a control signal when the divided voltage exceeds a predetermined value. A first switch circuit 40 short-circuits between the plus and minus terminals of the power supply 11 in response o the control signal. A second switch circuit 12 turns off between the plus terminal and the plus side of the power supply in response to the short-circuit operation thus stopping overcharge. COPYRIGHT: (C)2010,JPO&INPIT |
