| 摘要 |
PROBLEM TO BE SOLVED: To provide an undervoltage protective device for a fan that can achieve the effect to protect a unit within a fan in case of undervoltage in place of an analog control chip, because an extremely low input voltage causes a fan to stop, and can reduce the cost. SOLUTION: The undervoltage protective device 1 receives an input voltage 91 from the outside, and works with a fan 3. In addition, the undervoltage protective device 1 includes a voltage sensing unit 12 and a start unit 11. Among these units, the voltage sensing unit 12 receives an input voltage 91, whereas the start unit 11 can start the fan according to the input voltage 91 by being electrically connected to the voltage sensing unit 12 and the fan 3. If an input voltage 91' is not greater than a reference voltage V<SB>ref</SB>, the voltage sensing unit 12 closes the start unit 11. COPYRIGHT: (C)2007,JPO&INPIT
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