SPICE Simulation
Using LTSpice we simulated the operation of the QRC with parasitics and manufacturer provided models for our components to get a better sense how the circuit would operate in the real world. From this model we can measure the switching losses and verify that the circuit is soft-switching. Currently the simulation uses the Infineon provided model for our MOSFET, models for our inductors which account for their parasitics and a model for Cr which accounts for its series inductance.
Results
From our simulations, we can see that our system largely agrees with our ideal model. We see that the FET is soft-switched and only loses about 31 mW to switching loss (61.4 nJ per cycle). Additionally the conduction losses for the system are manageable (~5 W).
Using LTSpice we simulated the operation of the QRC with parasitics and manufacturer provided models for our components to get a better sense how the circuit would operate in the real world. From this model we can measure the switching losses and verify that the circuit is soft-switching. Currently the simulation uses the Infineon provided model for our MOSFET, models for our inductors which account for their parasitics and a model for Cr which accounts for its series inductance.
Results
From our simulations, we can see that our system largely agrees with our ideal model. We see that the FET is soft-switched and only loses about 31 mW to switching loss (61.4 nJ per cycle). Additionally the conduction losses for the system are manageable (~5 W).
Waveforms showing switching loss.
Converter waveforms.
Going Forward
To further improve these simulations, we need to include the manufacture models for our diodes. We currently have a SPICE model for one of the silicon carbide (SiC) diodes we use, however when including this model in our simulation, LTSpice crashes. As a result we may try manually adding the necessary parasitics to simulate a SiC diode's operation (or try another manufacturer's model).
To further improve these simulations, we need to include the manufacture models for our diodes. We currently have a SPICE model for one of the silicon carbide (SiC) diodes we use, however when including this model in our simulation, LTSpice crashes. As a result we may try manually adding the necessary parasitics to simulate a SiC diode's operation (or try another manufacturer's model).