The EV industry uses high-power resistors in a variety of applications including power converters for charging systems, power control unit, power distribution unit (PDU), and motor control unit and battery modules.

 

Microhm Electronics' resistors focuses on the cutting edge development of resistor technology. We work hand-in-hand with engineers to solve problems related to pre-charge, discharge and other applications for EV. From systems and long-term production experience, Microhm Electronics offers a wide range of eDrive technology solutions.
 

 

Microhm Electronics' resistors main advantages include:

 

Small package size

Wide resistance range

High reliability

High safety

High pulse capability

Easy mounting/handling

 

 

EV and PHEV (Plug-in Hybrid Electrical Vehicle) systems push the envelope of vehicle electrification by allowing high voltage battery banks to recharge from the mains. A high voltage charger converts electrical power from AC to DC, and controls the power flow to the high voltage battery. Electronics on board the car transform the wall power into the proper form to charge the battery. The power levels for these chargers range from 3 to 10 kW, and therefore require a front-end PFC circuit. There are 3 levels of charging that are classified by peak power capacity. Level 1 charging enables charging from any standard electrical plug, which in the United States is 120V and limited in peak amperage draw (8 - 15 amps) by local circuit breakers. Level 1 chargers are portable converters that may be placed in the trunk for use anywhere a standard outlet can be found. Charging can take up to 22 hours for a fully depleted battery. At Level 1 charging, a user might be inclined to plug in every time a charger is available, with cumulative partial charges extending driving range on an ongoing basis.

 

EV applications for Microhm resistors include the power Distribution Unit or Motor Control Unit. Microhm Electronics MDRT/MFRT227-4 and MDRT/MFRT227-2 are applicable to the MCU.