Method, Apparatus And Controller For Fault Detection Of Uninterruptible Power Supply

An apparatus for fault detection of an uninterruptible power supply, which is characterized by comprising an acquisition module and a processing module, wherein

• the acquisition module is configured to acquire a first voltage difference between a second terminal of a mains power switch device and a neutral line, before the mains power switch device is closed, wherein the mains power switch device is located in an uninterruptible power supply, the uninterruptible power supply further comprises a battery switch device and a charger capacitor, an input terminal of the uninterruptible power supply is electrically connected to a first terminal of the mains power switch device, a second terminal of the mains power switch device is electrically connected to the battery switch device, a second terminal of the battery switch device is electrically connected to a battery positive access terminal or a battery negative access terminal of the uninterruptible power supply, the battery positive access terminal is coupled to a first terminal of the charger capacitor, and the battery negative access terminal is coupled to a second terminal of the charger capacitor;
• the acquisition module is further configured to acquire a second voltage difference between the battery positive access terminal and the neutral line when the second terminal of the battery switch device is electrically connected to the battery positive access terminal, wherein a voltage value of the battery positive access terminal is a voltage value of a positive electrode of a battery connected to the battery positive access terminal or a voltage value of the first terminal of the charger capacitor;
• the acquisition module is further configured to acquire a second voltage difference between the battery negative access terminal and the neutral line when the second terminal of the battery switch device is electrically connected to the battery negative access terminal, wherein a voltage value of the battery negative access terminal is a voltage value of a negative electrode of a battery connected to the battery negative access terminal or a voltage value of the second terminal of the charger capacitor;
• and
• the processing module is configured to determine that the battery switch device is faulty in a case where an absolute value of a difference between the first voltage difference and the second voltage difference is less than or equal to a first preset voltage difference.