| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an uninterruptible system with stable quality and safety by overcoming defects of a monitoring circuit in a conventional uninterruptible power supply system.SOLUTION: In a voltage abnormality protection circuit for an uninterruptible power supply system, a rectification unit, a filter unit, a battery unit, at least one voltage regulation unit and at least two voltage monitoring units are connected in order. The voltage regulation unit includes at least one voltage drop element and a bypass switch unit connected to the voltage drop element in parallel. The voltage monitoring units are connected to an input side and an output side of the voltage regulation unit, respectively, and used for monitoring voltages at the input side and the output side of the voltage regulation unit, thereby controlling the rectification unit provided in one terminal of an external power source, a breaker and the bypass switch unit.</p> |
