Is this Half-Bridge waveform right?
Your circuit is a DC-restore gate drive scheme. The primary waveform gets AC-coupled and DC-restored on the secondary side.

Probe across the 4.7k resistor and you'll see what the MOSFET is seeing. (Also, 100nF is a little excessive for a MOSFET gate - go with 1 to 10nF to keep it real.) When you look at the gate, you should see that this scheme needs an active pull-down as there's no discharge path for the gate capacitance other than the resistor. Commonly a PNP transistor is used for this function.



(You may also need to damp/clamp the coupling capacitors depending on the amount of ringing you get.)

Assuming you only want the positive parts of the pulses, here's another configuration that's suitable for a half-bridge (symmetrical drive for each FET) - notice no coupling capacitors.