Current leakage detection IC for automotive applications

July 02, 2013 // By Graham Prophet
For backup power supplies in EVs and HEVs that contribute to greater system safety, Rohm has announced an automotive-grade leakage detection IC designed specifically for AC inverters and chargers for AC outlets in electric and hybrid vehicles.

The BD9582F-M features a wide operating temperature range and is AEC-Q100-certified, ensuring stable, reliable operation in automotive systems. In addition, industry-low current consumption (330 µA) contributes to longer battery life. A growing number of hybrid and electric cars are being equipped with emergency or backup power systems, which include outlets that can power not only portable devices such as smartphones, but high power consumption consumer equipment as well. Safety systems similar to earth leakage circuit breakers that incorporate leakage detection ICs used in homes and buildings are currently being considered for cars in order to prevent electric shock or fires when using AC outlets. However, severe challenges regarding reliability (including temperature protection) must be overcome before full implementation is possible.

In response, Rohm developed a new leakage detection IC designed to provide safe, reliable operation of AC outlets in vehicles. The BD9582F-M expands the temperature range from the conventional -20°C to 95°C to a more robust -40°C to 105°C and protects against electromagnetic radiation, providing the necessary level of reliability for automotive applications.

Rohm’s leakage detection IC also complies with semiconductor standard AEC-Q100 for automotive applications and gives improved cutoff (interrupt) performance and greater system safety. In addition, further circuit optimization results in current consumption of 330uA, prolonging battery life while maintaining high-reliability operation. Also, this IC is compatible with AC100~240V, ensuring support not only for automotive systems but consumer devices as well.