Sensor and control specialist Sendyne has introduced a single IC and module that’s capable of performing ground fault detection/isolation monitoring while simultaneously providing current, high voltage and temperature measurements.
Reliable ground fault detection is a necessity for EVs and charging stations in order to prevent leakage currents from posing a shock hazard. According to Sendyne, conventional systems rely on sensing static voltages and employing asymmetrical bleed resistors, and are incapable of sensing some leakage sources. The company’s new SFPGFD uses controllable excitation voltage, and is able to detect all sources of leakage, as well as resistive shorts between the chassis and battery.
Sendyne’s SFPGFD IC and module continuously monitor the isolation resistance in order to notify the host system of possible dangerous levels of leakage current. Two dedicated channels measure voltage from battery to chassis and total battery potential; the latter is also available for utilization by the battery management system.
The SFPGFD module also has four extra high voltage channels that can be used for monitoring pre-charge status, state of fuses, contactors, and more. All six voltage channels can measure ±450 V continuous and ±650 V momentary overvoltage. These levels can be extended for systems operating at higher voltages.
The SFPGFD communicates with a host via the LIN protocol. Other protocols are available. It conforms to international standards for isolation monitoring, such as UN Reg. 100, FMVSS305 and ISO6469-1.
“Sendyne is focused on bringing advanced, cost-effective technologies to market that enhance the safety and functionality of EV, HEV and other battery systems,” said Aakar Patel, Sendyne’s VP of Business Development.