Patent ID: 8736248

Claim:
A detection circuit for detecting that a power supply unit is connected to a wrong supply voltage, wherein said detection circuit comprises: a first voltage divider ( 24 , 26 , 28 ) connected to output terminals ( 20 , 50 ) of a rectifier ( 16 ) of the power supply unit, a second voltage divider ( 26 , 32 ) connected to a first power input terminal ( 10 ) of the power supply unit and to one of the output terminals ( 20 , 50 ) of the rectifier ( 16 ), and a circuit breaker ( 14 ) connected to the first power input terminal ( 10 ) of the power supply unit and to an input terminal of the rectifier ( 16 ), wherein at least one partial voltage of each voltage divider ( 24 , 26 , 28 ; 26 , 32 ) is used as a signal ( 22 , 46 ), wherein the detection circuit further comprises a data processing unit for analyzing the signal from each voltage divider ( 22 , 46 ), and wherein the data processing unit includes at least one microprocessor configured to identify the wrong supply voltage.