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On Board Charging

Best in class automotive power semiconductors including Silicon Carbide (SiC) MOSFETs, SiC diodes, silicon Super-Junction (SJ) MOSFETs, hybrid IGBTs, and Automotive Power Modules (APMs), enable customers to maximize power density, efficiency and reliability for their On Board Charger (OBC) designs. Customers can design OBC power stages that address 3.3 kW up to 22 kW and battery voltages up to 800 V using ON Semiconductor solutions.

Plugin Hybrid Electric Vehicles (PHEV), Battery Electric Vehicles (BEV), and Fuel Cell Electric Vehicles (FCEV) use OBC modules to charge the high voltage battery pack. The term 'New Energy Vehicle (NEV)' encompasses all 3 types mentioned above (PHEV, BEV, FCEV). The high-level function of the OBC is to convert an AC voltage input to a DC voltage output with the appropriate output current and voltage level for the battery pack to charge. While many OBC implementations are unidirectional (grid-to-vehicle), there is a movement to provide bidirectional capability allowing grid-to-vehicle and vehicle-to-grid charging with BEVs.

These “On Board” Charger modules, located on the vehicle as the name suggests, have air or liquid cooling to help with thermal management due to the power levels. Depending on the architecture, the OBC output may need to operate down to less than 250 VDC and operate at 800 VDC or higher when charging the main vehicle battery pack.

Whether it is Power Factor Correction (PFC), primary side DCDC, or secondary rectification, ON Semiconductor provides the best solution to address your system requirements. Our premier automotive product portfolio for OBC covers SiC MOSFETs, SiC diodes, APMs, MOSFETs, IGBTs, gate drivers, In-Vehicle Networking (LIN, CAN, CAN-FD), analog signal chain (OpAmps, current shunt amplifiers, comparators), power supply ICs, System Basis Chips (SBCs) and silicon diodes.

OBC Reference Designs
SEC-3PH-11-OBC-EVB: 11kW 3-Phase On Board Charger (OBC) PFC-LLC Platform
The 11kW reference design is a 3-phase On Board Charger (OBC) platform achieving state-of-the-art system efficiency with automotive qualified SiC power devices and drivers. The system boasts high performance 1200V / 80 mΩ SiC MOSFETs (NVHL080N120SC1), 6A SiC MOSFET Gate Drivers (NCV51705) and 650V / 30A SiC Diodes (FFSB3065B-F085).
SEC-6D6KW-OBC-SIC-GEVB: 6.6kW OBC Reference Design Using SiC
This 6.6kW OBC reference design demonstrates the usage of SiC MOSFET and SiC diode technology for the full power stage path (PFC, LLC and Secondary Rectification) providing higher power density than traditional Silicon devices.
SEC-6D6KW-OBC-TTP-GEVB: 6.6kW OBC Reference Design Using Totem Pole PFC
This 6.6kW OBC reference design demonstrates Totem Pole PFC in On Board Charging with a total system efficiency of 97% (typical).
3.3kW APM OBC Demo Board Test Report
This 3.3kW OBC reference design demonstrates using our Automotive Power Modules (APMs) to reduce system size and improve efficiencies of the PFC, LLC and Secondary Rectification.
Isolated Auxiliary Power Reference Designs
SECO-HVDCDC1362-15W15V-GEVB: 15W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 15W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
SECO-HVDCDC1362-40W15V-GEVB: 40W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 40W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
Isolated Gate Driver Power Reference Designs
SECO-LVDCDC3064-IGBT-GEVB: 6V to 18V Input Isolated IGBT Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for IGBTs. The output voltage rails are −7.5V / 15V for efficient switching as well as an additional 7.5V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5 V and a voltage divider.
SECO-LVDCDC3064-SIC-GEVB: 6V to 18V Input Isolated SiC Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for SiC MOSFETs. The output voltage rails are −5.0V / 20V for efficient switching as well as an additional 5.0V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5V and a voltage divider.
交互式框图
On Board Charger
ON Semiconductor offers a complete On Board Charger solution with the wide selection of super-junction MOSFETs, IGBTs, SiC devices, gate drivers, Op Amps, and Current Sense Amplifiers.
Product Family
Silicon Carbide (SiC) Products for 400V & 800V OBC Systems
1200V SiC MOSFETs - Automotive
Automotive SiC MOSFETs for 800V battery systems
650V SiC MOSFETs - Automotive
Automotive SiC MOSFETs for 400V battery systems
1200V SiC Diodes - Automotive
Automotive SiC Diodes for 800V battery systems
650V SiC Diodes - Automotive
Automotive SiC Diodes for 400V battery systems
Silicon Products for 400V & 800V OBC Systems
650V APMs - Automotive Power Modules
Automotive Power Modules (APMs) for 400V battery systems
650V Silicon Super-Junction SUPERFETs - Automotive
Automotive SUPERFET MOSFETs for 400V battery systems
650V IGBTs (Hybrid & Standard) - Automotive
Automotive IGBTs for 400V battery systems
1200V Hybrid IGBTs - Automotive
Automotive Hybrid IGBTs for 800V battery systems
600V Silicon Diodes - Automotive
Automotive Silicon Diodes for 400V battery systems
Gate Drivers & Gate Drive Power Supplies for OBC Systems
Isolated Gate Drivers - Automotive
Automotive isolated gate drivers for OBC
NCV51705 Gate Driver for SiC MOSFETs - Automotive
Automotive SiC MOSFET gate driver (non-isolated) with power output for digital isolator
NCV3064 Automotive Controller for Isolated Gate Drive Supply
Automotive isolated gate driver supply
NCV1397 Automotive Controller for Isolated Gate Drive Supply
Automotive isolated gate driver supply
Resonant Controllers, Power Supplies and In-Vehicle Networking for OBC Systems
NCV4390 - Automotive LLC Resonant Controller
Automotive resonant controller with synchronous rectifier control
NCV1362 Automotive Controller for Isolated Auxiliary Supply
Automotive isolated auxiliary power supply
LDO Regulators - Automotive
Automotive LDO regulators for pre-regulation and post-regulation
Automotive In-Vehicle Networking - IVN
Automotive System Basis Chips (SBC) & stand-alone CAN, CAN-FD and LIN Transceivers
ESD Protection for CAN, CAN-FD & LIN
Automotive ESD protection for communication in OBC
Analog Signal Chain for OBC Systems
Current Sense Amplifiers (CSA) - Automotive
Automotive current sense amplifiers for OBC
NCV2191x Precision OpAmps - Automotive
Automotive precision opamps with zero-drift, low noise and 2MHz BW in 1,2 and 4 channel options
Comparators - Automotive
Automotive comparators for OBC
NVT211 I2C Digital Temperature Sensor - Automotive
I2C digital temperature sensor for monitoring board temperature in OBC
NCV431 Voltage Reference - Automotive
Automotive voltage reference for high accuracy ADC measurements
Technical Documents
On Board Charger (OBC) LLC Converter

Design overview, simulation data and bench data using Silicon Carbide MOSFETs with NCV51705 SiC gate drivers for the primary side LLC and SiC diodes for the secondary rectification

On Board Charger (OBC) Three-Phase PFC Converter

Design overview and bench data using Silicon Carbide MOSFETs with NCV51705 SiC gate drivers in a 3 leg bridge configuration for Power Factor Correction (PFC)

6.6 kW On Board EV Charger Reference Design

Overview of 6.6kW discrete solution using Super-Junction MOSFETs and Silicon Carbide (SiC) diodes with test results

Electric Vehicle OBC System Design and Simulation Using Power Modules

Simulation of OBC performance using Automotive Power Modules (APMs) instead of discrete components

3.3 KW On Board EV Charger (OBC) Design Note

Overview of 3.3kW discrete solution using Super-Junction MOSFETs and Silicon Carbide (SiC) diodes with test results

Gate Driver Ecosystem - Orderable
SECO-GDBB-GEVB: Gate Drivers Plug-and-Play Ecosystem
Ecosystem allows for the comparison of the dynamic performance and capabilities of different gate drivers.
Isolated Auxiliary Power - Orderable
SECO-HVDCDC1362-15W15V-GEVB: 15W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 15W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
SECO-HVDCDC1362-40W15V-GEVB: 40W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 40W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
Isolated Gate Driver Power - Orderable
SECO-LVDCDC3064-IGBT-GEVB: 6V to 18V Input Isolated IGBT Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for IGBTs. The output voltage rails are −7.5V / 15V for efficient switching as well as an additional 7.5V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5 V and a voltage divider.
SECO-LVDCDC3064-SIC-GEVB: 6V to 18V Input Isolated SiC Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for SiC MOSFETs. The output voltage rails are −5.0V / 20V for efficient switching as well as an additional 5.0V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5V and a voltage divider.
Featured Videos


On Board Charger Overview

A brief overview of our 11kW OBC PFC and LLC reference design boards



Automotive Power Modules (APMs) - 3.3kW OBC Overview

A brief overview of our 3.3kW OBC reference design that uses APMs for the PFC, LLC and secondary rectification



Automotive Isolated Gate Driver Supply for IGBTs

Using the NCV3064 automotive qualified controller for isolated gate driver supplies



Automotive High Voltage Isolated Auxiliary Supply

Using the NCV1362 automotive qualified controller for isolated auxiliary power supplies



ON Semiconductor and Mercedes-EQ Formula E

Ian James from the Mercedes-EQ Formula E team discussing the partnership with ON Semiconductor

Featured Blogs
How Silicon Carbide Technology Changes Automotive On Board Charging (OBC)
Overview on how SiC technology enables Totem Pole PFC in On Board Charging (OBC).
ON Semiconductor Returns to Season 7 Formula E with Mercedes-EQ FE Team
Silicon Carbide (SiC) solutions from ON Semiconductor & how the partnership helps the Mercedes-EQ FE team succeed.
New Auxiliary Power Supply Solutions for Vehicle Electrification
Auxiliary power in automotive applications using the NCV1362 and NCV3064 controllers.
On Board Charging Solutions: What's On the Market?
Discussion on some of the available reference designs using a variety of technologies including Si SJ SUPERFET III, SiC MOSFETs, SiC Diodes and Automotive Power Modules (APMs).
Electrification of Agricultural Vehicles
Market size and emerging technologies.
Wide Bandgap Offers Faster Charging Capabilities for Electric Vehicles
Learn how wide bandgap materials such as SiC are superior for EV charging
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