Specialist relay carries heavy surge currents for EV/HEV pre-charge function

January 07, 2015 // By Graham Prophet
Omron Electronic Components Europe (OCB-EU) has added a pre-charge relay aimed specifically at electric and hybrid vehicles and other heavy duty battery powered systems.

The G9EJ-1 is specifically designed for use in pre-charge circuits used in electric vehicles and other battery systems to reduce the very high inrush currents on start-up. Before the vehicle or system is fully started, the pre-charge circuit is switched on briefly to charge capacitors in the controller and inverter through a current-limiting resistor. The G9EJ-1 is specifically designed to switch in this circuit, and is a cost-effective solution that can support up to 25A at 400 VDC.

Omron has designed the G9EJ with a proprietary contact driving system that enhances the inrush current performance and ensures a long service life under these conditions. The G9EJ also features a high-efficiency magnetic circuit which helps extinguish magnetic arcs which can damage the contact surface. The relay is amongst the smallest solutions of its type, sized at just 30 x 27 x 31 mm and weighs around 50g.

The G9EJ-1 complements the Omron range of power relays for the electric vehicle main power relays, which switch in the full motor circuit once the pre-charge phase is complete. These include the G9EC which can switch up to 200A at 400 VDC.

Omron; http://components.omron.eu