Semiconductor Device and Power Conversion System

A semiconductor device formed on a semiconductor substrate, comprising:

• a first signal output circuit connected with a first power supply node and a first ground node;
• a second signal output circuit connected with a second power supply node electrically separated from the first power supply node, and a second ground node electrically separated from the first ground node;
• a PN junction portion formed of a P type part electrically connected with the first ground node, and an N type part electrically connected with the second power supply node;
• and
• a magnetic coupling element having a first conductor coil and a second conductor coil which are magnetically coupled,
• the first conductor coil being electrically connected with an output side of the first signal output circuit,
• the second conductor coil being electrically connected with an input side of the second signal output circuit.