Find the perfect block diagram with our step-by-step guide below. Start by choosing a solution,
then refine your selection as the next fields adapt dynamically to lead you to the final diagram.
Expanded View
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Monitor","path":"/design/interactive-block-diagrams/medical/continuous-glucose-monitor","children":[]},{"id":"f6130e35-4fd0-4719-acac-e3da45c1a9a6_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Hearing Aid","path":"/design/interactive-block-diagrams/medical/hearing-aid","children":[]},{"id":"a3e4f792-c0dc-4153-bb76-59bbe623ed64_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Patient Monitor","path":"/design/interactive-block-diagrams/medical/patient-monitor","children":[]},{"id":"fa0c8829-c8b8-426a-8624-fb6406550d0b_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Ultrasound Transducer","path":"/design/interactive-block-diagrams/medical/ultrasound-transducer","children":[]}]},{"id":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","parentId":"9d330931-7485-49dd-ae21-990ea4e17af9_IBD_SOLUTION","text":"Medical Imaging","path":null,"children":[{"id":"7780a3f3-3fe2-4f1c-a8f4-f873ed853c45_IBD_DIAGRAM","parentId":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","text":"Digital Radiography","path":"/design/interactive-block-diagrams/medical/digital-radiography","children":[]}]}]}]

On Board Charger (400V) - Block Diagram

On board charger (OBC) converts AC power from the grid to DC power to charge 400V EV battery.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "1-3 Phase AC Charger", "function": "Converts AC input from the grid to DC output.", "theory_of_operation": "Uses rectifiers and filters to convert AC voltage to DC voltage.", "interaction": "Supplies power to the PFC Stage.", "category": "Third party", "connection": [ "PFC Stage" ] }, { "name": "PFC Stage", "connection": [ "DC-DC Stage", "Voltage & Current Sensing" ], "sub_blocks": [ { "name": "Si & SiC Discretes", "function": "Power Factor Correction (PFC) improves the power factor of the system.", "theory_of_operation": "Uses silicon (Si) and silicon carbide (SiC) components to correct power factor by shaping input current waveform.", "interaction": "Receives AC input from the charger and provides corrected DC output to the DC-DC stage.", "category": "onsemi", "connection": [] }, { "name": "Si & SiC Modules", "function": "Power Factor Correction (PFC) improves the power factor of the system.", "theory_of_operation": "Uses silicon (Si) and silicon carbide (SiC) components to correct power factor by shaping input current waveform.", "interaction": "Receives AC input from the charger and provides corrected DC output to the DC-DC stage.", "category": "onsemi", "connection": [] } ] }, { "name": "DC-DC Stage", "connection": [ "400V HV Battery Pack", "Voltage & Current Sensing" ], "sub_blocks":[ { "name": "Si & SiC Discretes", "function": "Converts high-voltage DC from PFC stage to appropriate levels for battery charging.", "theory_of_operation": "Utilizes buck or boost converters with Si and SiC components for efficient voltage conversion.", "interaction": "Takes corrected DC from PFC stage and outputs regulated DC for battery charging.", "category": "onsemi", "connection": [] }, { "name": "Si & SiC Modules", "function": "Converts high-voltage DC from PFC stage to appropriate levels for battery charging.", "theory_of_operation": "Utilizes buck or boost converters with Si and SiC components for efficient voltage conversion.", "interaction": "Takes corrected DC from PFC stage and outputs regulated DC for battery charging.", "category": "onsemi", "connection": [] } ] }, { "name": "Isolated Gate Driver", "function": "Provides isolation between control signals and high-power devices.", "theory_of_operation": "Uses transformers or optocouplers for signal isolation while driving gate terminals of transistors in PFC/DC-DC stages.", "interaction": "Interfaces between MCU control signals and power switches in PFC/DC-DC stages.", "category": "onsemi", "connection": [ "PFC Stage", "DC-DC Stage" ] }, { "name": "Voltage & Current Sensing", "function": "Measures voltage and current levels within the system.", "theory_of_operation": "Employs sensors like shunt resistors, Hall effect sensors, or transformers for accurate measurements.", "interaction": "Feeds measurement data back to MCU for monitoring and control purposes.", "category": "onsemi", "connection": [ "MCU" ] }, { "name": "400V HV Battery Pack", "function": "Stores energy converted by OBC.", "theory_of_operation": "Lithium-ion cells connected in series/parallel configurations.", "interaction": "Receives charge from DC-DC stage.", "category": "Third party", "connection": [ "DC-DC Stage", "Power Management" ] }, { "name": "Power Management", "connection": [ "Isolated Gate Driver", "MCU", "MCU Interface" ], "sub_blocks":[ { "name": "HV Battery Disconnect", "function": "Disconnects the high-voltage battery from the rest of the system for safety and maintenance.", "theory_of_operation": "Uses electromechanical switches to control the connection.", "interaction": "Interfaces between the battery pack and the rest of the system.", "category": "onsemi", "connection": [] }, { "name": "HV Auxiliary Power", "function": "Provides auxiliary power to high-voltage components.", "theory_of_operation": "Converts high-voltage DC to lower voltage DC for auxiliary systems.", "interaction": "Interfaces with high-voltage components.", "category": "onsemi", "connection": [] }, { "name": "LV Auxiliary Power", "function": "Provides auxiliary power to low-voltage components.", "theory_of_operation": "Converts high-voltage DC to lower voltage DC for auxiliary systems.", "interaction": "Interfaces with low-voltage components.", "category": "onsemi", "connection": [] }, { "name": "LV Power Protection", "function": "Protects low-voltage components from overcurrent and overvoltage conditions.", "theory_of_operation": "Uses fuses, circuit breakers, and other protective devices.", "interaction": "Interfaces with low-voltage components.", "category": "onsemi", "connection": [] } ] }, { "name": "Communication", "connection": [ "MCU", "CAN BUS", "Automotive Ethernet" ], "sub_blocks":[ { "name": "In Vehicle Networking", "function": "Facilitates communication between different components within the vehicle.", "theory_of_operation": "Uses communication protocols like CAN, LIN, and Ethernet.", "interaction": "Interfaces with MCU and other communication interfaces.", "category": "onsemi", "connection": [] }, { "name": "ESD Protection", "function": "Protects components from electrostatic discharge.", "theory_of_operation": "Uses ESD protection devices like diodes and capacitors.", "interaction": "Interfaces with sensitive components.", "category": "onsemi", "connection": [] } ] }, { "name": "CAN BUS", "function": "Represents external CAN BUS connection", "theory_of_operation": "Uses communication to ensure reliable data exchange.", "interaction": "Interfaces with MCU and other communication interfaces.", "category": "Third party", "connection": [ "Communication" ] } { "name": "Automotive Ethernet", "function": "Represents external Automotive Ethernet connection", "theory_of_operation": "Uses communication to ensure reliable data exchange.", "interaction": "Interfaces with MCU and other communication interfaces.", "category": "Third party", "connection": [ "Communication" ] } { "name": "MCU Interface", "connection": [ "MCU" ], "sub_blocks":[ { "name": "Interface Components", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": [] } ] }, ], "interconnections": [ { "source": "1-3 Phase AC Charger", "target": "PFC Stage" }, { "source": "PFC Stage", "target": "DC-DC Stage" }, { "source": "PFC Stage", "target": "Voltage & Current Sensing" }, { "source": "DC-DC Stage", "target": "400V HV Battery Pack" }, { "source": "DC-DC Stage", "target": "Voltage & Current Sensing" }, { "source": "Isolated Gate Driver", "target": "PFC Stage" }, { "source": "Isolated Gate Driver", "target": "DC-DC Stage" }, { "source": "Voltage & Current Sensing", "target": "MCU" }, { "source": "MCU", "target": "Voltage & Current Sensing" }, { "source": "400V HV Battery Pack", "target": "Power Management" }, { "source": "Power Management", "target": "MCU" }, { "source": "Power Management", "target": "Isolated Gate Driver" }, { "source": "Power Management", "target": "MCU Interface" }, { "source": "MCU", "target": "MCU Interface" }, { "source": "MCU Interface", "target": "MCU" }, { "source": "MCU", "target": "Communication" }, { "source": "Communication", "target": "CAN Bus" }, { "source": "CAN Bus", "target": "Communication" }, { "source": "Communication", "target": "Automotive Ethernet" }, { "source": "Automotive Ethernet", "target": "Communication" }, { "source": "Communication", "target": "MCU" }, ], "Last_update": "2025-07-30",

On Board Charger (400V)

Si & SiC
Discretes - Block

Products

  • High Voltage MOSFETs
    • NVB055N60S5F

      Power MOSFET, N-Channel, SUPERFET® V, FAST, 600 V, 45 A, 55 mΩ, D2PAK

    • NVHL040N60S5F

      Power MOSFET, N-Channel, SUPERFET® V, FAST, 600 V, 59 A, 40 mΩ, TO-247

    • NVB125N65S3

      MOSFET - Power, N-Channel, SUPERFET® III, Automotive, Easy-drive, 650 V, 24 A, 125 mΩ

  • IGBTs
  • Silicon Carbide (SiC) Diodes
    • FFSD0865B-F085

      Silicon Carbide (SiC) Schottky Diode - EliteSiC, 8A, 650V, D2, DPAK

    • FFSH2065B-F085

      Silicon Carbide (SiC) Schottky Diode - EliteSiC, 20A, 650V, D2, TO-247-2L

    • FFSP4065BDN-F085

      Silicon Carbide (SiC) Schottky Diode - EliteSiC, 40A, 650V, D2, TO-220-3L

  • Silicon Carbide (SiC) MOSFETs
    • NVBG032N065M3S

      Silicon Carbide (SiC) MOSFET – EliteSiC, 32 mohm, 650 V, M3S, D2PAK-7L

    • NVH4L032N065M3S

      Silicon Carbide (SiC) MOSFET – EliteSiC, 32 mohm, 650 V, M3S, TO-247-4L

    • NVH4L023N065M3S

      Silicon Carbide (SiC) MOSFET – EliteSiC, 23 mohm, 650 V, M3S, TO-247-4L

    • NVH4L095N065SC1

      Silicon Carbide (SiC) MOSFET, N‐Channel - EliteSiC, 70 mohm, 650V, M2, TO247−4L

    • NVBG060N065SC1

      Silicon Carbide (SiC) MOSFET - EliteSiC, 44 mohm, 650 V, M2, D2PAK−7L

    • NVT2023N065M3S

      Silicon Carbide (SiC) MOSFET – EliteSiC, 23 mohm, 650 V, M3S, T2PAK

  • Small Signal Switching Diodes
    • BAS16H

      100 V Switching Diode

    • MMDL914

      100 V 200 mA High Speed Switching Diode

    • 1N914BWS

      Small Signal Diode

Technical Documentation

Evaluation Boards/Kits

  • EVBUM2909G-EVK

    Discrete Double Pulse Tester – Extension Daughter Cards Set

  • NCP13994MM360GEVB

    All-in-One 360 W power supply using NCP1618, NCP13994, NCP4318 and NCP431

FAQs

1. Why are 400 V on‑board chargers widely used in EV platforms?

400 V on‑board chargers are widely used because they balance efficiency, cost, and system maturity. This voltage level supports most current EV battery architectures while enabling manageable insulation requirements, proven component availability, and compatibility with global AC charging infrastructure.

2. What are the main functional blocks of a 400 V OBC?

A 400 V OBC typically includes AC input protection, EMI filtering, power factor correction, isolated DC‑DC conversion, gate drivers, power semiconductors, sensing circuits, and a control unit. These blocks ensure efficient conversion, electrical isolation, and compliant charging behavior.

3. What benefits does a high‑efficiency 400 V on‑board charger provide?

A high‑efficiency 400 V on‑board charger reduces conversion losses and heat generation. This improves vehicle energy efficiency, enables smaller cooling systems, supports compact packaging, and enhances long‑term reliability under repeated charging cycles and varying ambient conditions.

4. Where are 400 V on‑board chargers commonly used?

400 V on‑board chargers are commonly used in passenger electric vehicles, plug‑in hybrids, and light commercial EVs. They support single‑phase and multi‑phase AC charging and are well suited for vehicles targeting global markets and established charging standards.

5. How does the onsemi Interactive Block Diagram help me select parts and build a worksheet/BOM?

The onsemi interactive block diagram lets you select a taxonomy, choose devices per block, and download a worksheet. If you need a deeper dive into the tool, watch our tutorial video.

Worksheet (BOM) Preview

Worksheet (BOM)

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