Method and circuit for detecting alternating-current fuse failure of uninterruptible power supply
A fault detection and voltage detection technology, applied in circuit breaker testing and other directions, can solve problems such as easy misjudgment of AC fuse failure, failure to detect small current of AC fuse fault, etc. The effect of alarming problems and improving reliability
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[0017] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.
[0018] Please see attached figure 2 , the circuit in the present invention mainly includes a voltage detection module, a switch module, a filter module, a voltage regulator tube and a switch tube. In this embodiment, the voltage detection module includes two branches connected in reverse parallel, and the first branch includes Resistor R1, capacitor C1 and the primary side of the first optocoupler connected in series (that is, the light-emitting diode in the optocoupler), the second branch includes resistor R2 connected in series, capacitor C2 and the primary side of the second optocoupler, two The two ends of each branch are respectively connected to the two ends of the AC insurance to be detected, and the directions of the light-emitting diodes...
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