SECURITY CONTROL METHOD AND DEVICE FOR SYSTEM WITH PRECHARGING CIRCUIT, AND SYSTEM THEREOF

摘要

The object of the present application is to ensure the safety of a device when a precharging relay is not closed and a load current passes through a precharging resistor, so as to ensure the customer's safety. Provided is a safety control method for a system with a precharging circuit, comprising: giving out an error alarm and stopping operating the system when the number of times of undervoltage of a precharging circuit achieves m times and the duration between the first undervoltage and the m th undervoltage is less than or equal to Ä seconds, where m and Ä are positive integers. Compared with the previous method, the present invention has the following advantages of no danger of combustion and high reliability; and cost saving and no need of adding additional hardware.