Sdde721 Work

Unlike simple relays, the SDDE721 uses IGBTs (Insulated Gate Bipolar Transistors) to convert a DC bus voltage into a three-phase AC waveform. This process is known as Pulse Width Modulation (PWM). The at this stage is critical: it must switch the transistors thousands of times per second to create a sinusoidal current that drives the motor smoothly without cogging.