By Mike Donnelly - Principal Engineer at Siemens Digital Industries Software.
The goal is to demonstrate how DesignSpark Circuit Simulator can provide a complete application development and demonstration platform, to show potential customers the value of Infineon parts in motor drive applications.
This progression of circuits shows how you can start with a very abstract (continuous, non-switching) version of the drive circuit, where it is easy to view the overall system performance, change and test control parameters under various loading conditions, etc. You can use that level of design abstraction to identify the requirements for current ratings during ramp-up and at steady-state operation under various loading conditions. You can see that in this circuit:
The circuit shows an ideal field-oriented motor system with continuous (non-switching) voltage drive. Machine parameters are based on an idealized Prius Traction Motor.
All the parameters in blue-highlight can be changed and the design re-simulated to see the effect; the simulation runs in a fraction of a second, so very responsive! You can also move or place new waveform probes to look at other variables in anywhere in the system. Note that this entire design can be embedded in an online article or interactive application example to provide an educational or marketing context.
Next, the continuous drive circuit is replaced with a switching circuit. It uses ideal (digital input controlled) switch and diode components, to roughly approximate the main characteristics of the target MOSFET switches. In this case, you can experiment with the required switching rate (Ts) on the SVM (Space Vector Modulation) Controller block. That function was not relevant in the previous (non-switching) version. You can still make the same control and load parameter changes as in the continuous version, but this simulation requires about 2.5 minutes to simulate (a DS Creator and Engineer subscription benefit):
The circuit shows an ideal field-oriented motor system with ideal switches and diodes that roughly represent the parameters of an Infineon IMBG120R045M1H. Machine parameters are based on an idealized Prius Traction Motor.
Finally, the ideal switch and diode models are replaced with a “Datasheet” MOSFET model. It is calibrated to match the published IMBG120R045M1H datasheet (CoolSiC MOSFET). Simple gate drivers were added for each MOSFET, where the user can specify the voltage levels, ramp-times and impedance of their preferred gate driver. Machine parameters are based on an idealized Prius Traction Motor. You can view that circuit here:
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