On Board Charger (OBC)

Re-charging the batteries on a PHEV (plug in hybrid electric vehicles) or BEV (battery electric vehicles), is accomplished by connecting to an electric grid - usually at home or at street or shop charging stations.

On-board chargers (OBC) perform the following functions:

  • Convert the AC line voltage to a DC voltage
  • Boost the power factor via a PFC (power factor correction) circuit to meet regulatory standards
  • DC/DC conversion to match the charging profiles of the battery

 

The OBC has a central processor that handles the control algorithms for all the above functions. Isolation is necessary for safety from the high voltages/currents. Silicon Labs provides an effective total power management and isolation solution.

All products are fully AEC-Q100 qualified to grade 1 (-40°C to 125°C).


Solutions for Automotive On Board Chargers


Silicon Labs Solutions   Customer Benefits

Programmable Digital Power Controllers: Cost effective and efficient solution for the dc-dc converter; Closed-loop feedback control, system protection and power management functions; Dedicated 50 MIPS DSP-based control loop processor that enables 10 MHz control loop updates.

Adapts quickly and intelligently to changing battery voltages, including loading and unloading transients.

ISOdrivers for MOSFETs/sync FETs: Ultra-fast 50 ns propagation delays; Safety certified to 5.0, 3.75 or 2.5 kV rms; Withstand ±1500 VDC between outputs for dual drivers

Better timing margins, rock-solid operation over temperature and time and unparalleled size and cost benefits

Isolated Current Sensors: Uni-directional ac current sensors available in 10 and 20 A versions, provide a large output signal level of 2.0 V at full scale output range; Extremely low loss adding less than 1.3 mΩ of series resistance and less than 2 nH of series inductance in the sensing path at 25 ºC; Current-sensing terminals are isolated from the other package pins to a maximum voltage of 5 KV rms.

Size and performance advantages over current transformers, Hall effect devices, DCR circuits and other approaches

Isolators for SPI interface or to outside world: Isolation ratings up to 5 kV for robust operation

Ultra low power consumption, even at incredibly fast data rates; Robust multi-channel and bidirectional communications and reliability unachievable with opto-couplers

 
ISOdriver Challenge