The invention discloses a power electronic device auxiliary
control system based on a CPLD
chip. The
system comprises a DSP, a CPLD
chip driving the DSP to work, a
digital signal detection unit connected with the input end of the CPLD
chip, and a display and alarm part, an IGBT driver board and a
contactor control unit which are connected with the output end of the CPLD chip. The CPLD chip comprises an RS trigger group, a setting logic
AND gate, a fault identification module, a protection logic
AND gate, a blocking logic OR gate, a first time
delay logic and a second time
delay logic. The
power electronics device auxiliary
control system based on a CPLD chip of the invention has a comprehensive fault protection function covering
DC bus over-
voltage, DC over-current, three-phase AC output over-
voltage, three-phase AC load over-current and other faults, is of high versatility, and is applicable to all kinds of conventional power electronic devices. A fault type identifying method is provided, the type of a fault can be identified quickly and timely, and different alarm operations can be adopted according to different fault types to make the operation of the power electronic device run more flexible and efficient.