Use software Matlab to do time-domain simulation on the H-bridge DC-DC converter as shown in page 32 of Chapter 5 in the course lecture notes. There is a circuit diagram in Matlab style for your reference as in the attached file of this mail. By appropriately controlling the gate signals of the four IGBTs, try to make the DC motor work in all four quadrants respectively. For working in each quadrant, plot the corresponding gate signals for the 4 IGBTs, and plot the voltage waveforms and current waveforms of the load, the four IGBTs and the four diodes.