The three-phase inverter drive innovates automotive A/C systems with efficient control for brushless DC motors.
Hybrid electric vehicles (HEVs) feature a key system known as idle-stop or stop-start. This system turns off the engine when the car is idling, such as at a traffic light. However, this engine shutdown means no power to operate the A/C compressor. To address this, most hybrids and all-electric vehicles (EVs) incorporate an electrically driven compressor. This compressor integrates an electric motor powered by the vehicle’s high-voltage battery through an inverter. The inverter’s IGBTs handle high currents, leading to the widespread use of isolated components like gate drivers and analog-to-digital converters (ADCs). These components, while essential, introduce delays in the switching circuit and increase the overall cost. Additionally, the price is affected by the need for rotation detection in the motor. Designers often achieve this through the implementation of a resolver or by using a pair of Hall sensors, each contributing to the system’s complexity and expense.
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