On Board Power Switch From AB Mikroelektronik

AB Mikroelektronik On Board Power Switch enables fast, safe and noiseless disconnection with high-performance electric vehicle batteries.

E-mobility is changing the future of transport. This technology change is a global trend, and between 2020 and 2030 should become a reality for a broad base of consumers. For several years now, hybridization of vehicles has been rolling out across the fleets of many car manufacturers, and continued progress is expected.
During the start/stop-mode this customer specific developed electronic power switch for hybrid vehicles disconnects the start battery from the support battery of the power circuit.

AB Mikroelektronik´s On Board Power Switch achieves high power density in a small package volume

The powerful On Board Power Switch disconnects the battery of an electric car from the power train in a fast, safe and noiseless way. Bare die semiconductors are directly attached to rigid aluminium metal substrates, produced using thick film technology. The switch is located directly between the battery positive terminal and the load, and controls current flow in both directions.

All-aluminium power module for efficient and reliable connection to high current busbar systems

Parallel connection of multiple power semiconductors means higher currents can be supported, with power dissipation shared between them. Typical on-state resistance of the complete power module is as low as 0.75 mW at 25 °C. Very low thermal resistance of the module of only 0.2 K/W from semiconductor junction to water is achieved by applying materials with a high thermal conductivity. This property is mainly achieved by the pure aluminium metal substrate on which bare die semiconductors are directly attached. For transient current pulses, the thermal resistance is less than 0.1 K/W, which allows rapid power dissipation of about one kilowatt. For protection against humidity, and increased electrical isolation and ruggedness, the complete module is packaged in an epoxy compound with additional integrated sensors for temperature, voltage and current sensing.

The high efficiency of this On Board Power Switch assures a cost effective design and minimum power consumption in typical e-mobility applications.

Special Features:

  • Switching of maximum start and battery current
  • Same packaging volume as an equivalent mechanical relay
  • Absolutely noiseless switching
  • Over 300,000 active cycles possible

Our on board power switch supports the focal points of future mobility:
Electromobility