1. Inverter for drive motor

• It converts the DC power of the battery into AC power to operate the motor for driving a vehicle, and has a rated capacity of tens to hundreds of kW depending on the motor capacity. Since the motor used for xEV operates over a wide range from high speed and low speed to high speed, the inverter for xEV needs fast and precise control characteristics.
• In order to be able to travel as long as possible with limited electric energy, the power transmission efficiency characteristics to the motor must be excellent, and a low-loss design and heat dissipation structure for dissipating heat are essential.
• It is necessary to secure a compact, quantified structure and ease of installation considering the limited space in the vehicle. Since it is an essential device for xEV operation, it is required to guarantee high reliability that can maintain normal operation even under severe environmental conditions of the vehicle.

2. Step-up and step-down DC-DC converters

• There is a step-down type low-voltage DC-DC converter that steps down the DC voltage of the high-voltage battery installed in xEV to a voltage suitable for low-voltage electrical equipment, and this is called LDC (Low Voltage DC-DC Converter). On the other hand, there is a step-up type DC-DC converter that raises to a higher voltage than the battery and supplies it to the inverter, which is called HDC (High Voltage DC-DC Converter). The LDC must have an insulated electrical structure so that the idle power supply system and the low-voltage power supply system operate stably and ensure safety, and HDC must enable bidirectional power flow to enable the supply of regenerative power to the battery through the inverter in the vehicle system to which regenerative braking is applied.