Only spikes in H-Bridge
Your o-scope time base is set to 1.00 seconds and, by the looks of it your control signals will be switching at 0.5 Hz. This is waaaaaaaaaaay too low in frequency. You have (in your driver circuit) bootstrap components that help give good drive signals to your upper N channel MOSFETs but, these bootstrap circuits can only work when you have sufficient drive frequency in your control signals. Try upping the frequency to 10 kHz.



I don't know what your expected operating frequency is but if it's higher than 10 kHz then run at that higher frequency. If you expect to run at 0.5 Hz or thereabouts, this circuit won't work. The circuit above needs tens of kHz to work properly.