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Automotive - On-Board Chargers

Electric Vehicle On-Board Charging Systems

On-board charging systems (OBCs) convert AC power from an external charging source into a DC voltage that is used to charge the battery pack in the vehicle. OBCs also perform other functions including charge rate monitoring and protection. Industry charging standards for OBC systems are shown in the table below. AC Level 2 OBCs and some Level 1 systems require isolation. With DC Fast Chargers, which plug directly into the quick charging connector, OBCs are bypassed.
car onboard charger
  • Industry leading isolation solutions for on-board chargers

The Importance of Isolation in On-Board
Charging Systems


On-board charging systems take the AC input source, convert it to high voltage DC through the rectifier and provide Power Factor Correction (PFC). The resulting DC signal is chopped into a switched square wave, driving a transformer to create the required output DC voltage. The chopping of the input signal is accomplished using isolated gate drivers, such as Si8239x, Si823x, Si823Hx, and Si827x.

The output voltage is filtered to the final DC voltage using sync FETs under the control of additional isolated gate drivers. The output voltage can be monitored to provide closed-loop feedback to the system controller using isolated analog sensors, for example: Si892x

The entire system can be monitored and controlled via an Isolated CAN bus. The CAN is isolated with digital isolators and digital isolators with integrated DC/DC power converters, including Si86xx and Si88xx.





Block Diagram

 
  • Featured Products
  • Si86xx
  • Digital Isolators
  • Automotive Digital Isolator
  • Si88xx
  • Digital Isolators
  • Automotive Dig Isolator w/ Integrated dc dc
  • Si823Hx
  • Isolated Gate Drivers
  • Automotive 2.5 kV Dual Drivers
  • Si827x
  • Isolated Gate Drivers
  • Automotive Hi CMTI Single Isolated Driver
  • Si828x
  • Isolated Gate Drivers
  • Automotive Isolated Gate Drivers
  • Si8239x
  • Isolated Gate Drivers
  • Automotive Dual Iso Gate Driver
  • Si892x
  • Isolated Analog and ADCs
  • Automotive Isolated Analog Amplifier
  • Tools

Resources

Brochure Optocouplers Selection Guide Brochure Optocouplers-Selection-Guide.pdf
Brochure Aerospace and Defense Solutions Brochure Aerospace-and-Defense.pdf
White Paper Optocouplers for the Hybrid industry White Paper WP_Optocouplers_for_the_Hybrid_industry.pdf
Application Notes Gamma Total Dose Radiation Performance Gamma_total_dose_radiation_performance_204662A_AN.pdf
White Paper White Paper Discussion of RGA Test for Moisture Content for Isolink Optocouplers WP_RGA_2017_Feb.pdf
White Paper Proton Radiation Graph White Paper WP_Proton_radiation_graph.pdf
Designer Info High Reliability Process Option Flow Chart for Hermetic Optocouplers SX_AND_SB_FLOW_CHART.pdf
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