Gate drive circuit

A gate drive circuit comprising:

• a signal conversion circuit configured to operate with a potential of a first ground as a reference potential and convert a gate control signal that is a single-ended signal into a differential signal including a positive signal and a negative signal that have a signal level difference corresponding to the gate control signal;
• a first pulse transformer including a primary winding and a secondary winding that are electrically insulated from each other and have neutral points respectively, the primary winding including the neutral point set to have the potential of the first ground, the primary winding having both ends to which the positive signal and the negative signal of the differential signal are input respectively;
• an input difference voltage generation circuit including a pair of resistance elements connected in series to each other, the pair of resistance elements having both ends and a connection point that are respectively connected to both ends and the neutral point of the secondary winding of the first pulse transformer directly electrically or via a transmission cable and a second pulse transformer, the input difference voltage generation circuit configured to generate a pair of input difference voltages based on a potential of the connection point at the both ends of the pair of resistance elements;
• a differential amplifier circuit that is electrically connected to the input difference voltage generation circuit, the differential amplifier circuit configured to differentially amplify the pair of input difference voltages and output a pair of output difference voltages;
• and
• a gate drive signal generation circuit that is electrically connected to the differential amplifier circuit, the gate drive signal generation circuit configured to generate a gate drive signal that is a single-ended signal based on a predetermined potential on a basis of the pair of output difference voltages and output the gate drive signal to a switching element that operates with a potential of a second ground as a reference.