Modern Laboratory-Based Education for Power Electronics and Electric Machines(To continue)

I. INTRODUCTION Power electronics and motor drives are appropriate subjects for an advanced undergraduate or beginning graduate course. The subject is largely application-driven but draws from a broad knowledge base including basic circuits and electronics, control systems, power systems, and semiconductor devices. For many students, a power electronics laboratory can provide an early experience in synthesis, requiring them to use knowledge across their full curriculum with close attention to detail. It is well known that issues such as wiring configuration, circuit layout, and device selection can dominate the performance of a converter. Similarly, the study of electric machines requires practical demonstration so that students learn power flow and energy conversion concepts intuitively. This suggests that laboratory instruction has great value as a component of a power electronics and electric machines curriculum.

C. Example Experiment： AutomaticBattery Charger The flexibility of the SCR blue box allows closed-loop applications. To demonstrate feedback control, a simple 24-V battery charger was implemented. The circuit is a simple 3-phase half Bridge rectifier connected to the battery by an inductor. A simple control circuit monitors the battery voltage. Fig. 5 shows typical test waveforms for the circuit. When the prescribed battery voltage is reached, the control signal goes high and charging is stopped. Hysteresis ensures that charging will not resume until the battery voltage dips sufficiently.