LTspice- Huge current spikes across MOSFETs in full-bridge inverter
The load is at least 5 ohms so, from a 10 volt supply it cannot take more than 2 amps and this just leaves how you are driving the MOSFETs. If you don't apply a little bit of "dead-time" when changing the PWM polarity you will get a phenomena called "shoot-through". This is because the MOSFETs don't immediately switch-off when disabling them and you can certainly get massive spikes of current when this happens.