I am looking for a way to be able to power the H-brirdge from a boost converter.
I have a voltage source of 13V to 15V and would like to boost that up to around 17V (accuracy isnt that important) at around 4A, to power only the H-bridge.
I currently have the following circuit (please note that there are MOSFET dirvers missing):
If I simulate the following circuit in LTspice I get the following waveforms:
Green line represents the voltage coming from the boost converter and the blue line represents the current through R1.
Here, blue line represents the current through R1, while red (M2, M5) and light blue (M3, M4) lines represent H-bridge switching. There is 1\$\mu s\$ dead-time between H-bridge switching.
Can someone please explaing what is going on? And what do I need to do to make this work as intended?
If I get rid of the H-bridge and connect R1 directly to the output of the boost converter I get the deisred result (but I need H-bridge).
R1 represents a speaker.