Patent ID: 8754698

Claim:
A circuit for signal voltage transmission within a driver of a power semiconductor switch, comprising: a signal input for a first signal voltage, said signal input being arranged on a primary side of the driver, the primary side of the driver having a first, non-zero, reference potential applied thereto; a first current source arranged on the primary side of the driver for generating a first current correlated with the first signal voltage; a second current source; a first connecting line for carrying said first current, said first connecting line being connected to said first current source and leading from the primary side of the driver to a secondary side thereof, the secondary side having a second reference potential applied thereto; a second connecting line; a current-voltage converter which is arranged on the secondary side of the driver and is connected to said first connecting line serves for converting said first current into a second signal voltage correlated with said first current; said current-voltage converter containing a current minor for converting said first current coming from said first connecting line into a second current to be converted into said second signal voltage; and a signal output for said second signal voltage, said signal output being arranged on the secondary side of the driver; wherein said second side is capable of generating said second reference potential at a potential which is either higher or lower than said first, non-zero, reference potential at different times; wherein each of said second current source and said second connecting line is disposed between said signal input and said current-voltage converter; and wherein said first current source provides for signal transmission along said first connecting line when said first reference potential is greater than said second reference potential and said second current source provides for signal transmission along said second connecting line when said first reference potential is less than said second reference potential; and whereby said second signal voltage may be transmitted over said secondary side of the driver.