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)

LV Auxiliary Power - Block

Products

  • Controllers
    • NCV881930

      Low Quiescent Current 410 kHz Automotive Synchronous Buck Controller

    • NCV891930

      Low Quiescent Current 2 MHz Automotive Synchronous Buck Controller

    • NCV8856A

      Synchronous Buck Controller with adjustable output voltage. Drives dual N-channel MOSFETs. Input Supply Range 4.5 V to 38 V.

    • NCV12711

      Automotive Qualified 4-45 Vin DC/DC Peak Current Controller

  • Converters
    • NCV3064

      Buck / Boost / Inverting Converter, Switching Regulator, 1.5 A, with On/Off Function

    • NCV6323F

      Automotive, Buck converter, Synchronous, PWM, Fixed Output Voltage DC to DC converter, up to 1.6 A DC, Wettable flank DFN8, 2x2 mm (0.8 mm thickness), 0.5 mm pitch package

  • LDO & Voltage Regulators
    • NCV8163

      LDO Regulator, 250 mA, Ultra-Low Dropout, Ultra-Low Iq, Ultra-High PSRR, Ultra-Low Noise

    • NCV8164

      300mA LDO Regulator, Ultra-Low Noise, High PSRR with Power Good

    • NCV8189

      LDO, 500mA, Low noise, High Accuracy with Power-Good and Vout Controlled Slew Rate

    • NCV59801

      LDO, 1A, Low noise, Fixed and Adjustable, Controlled slew rate

    • NCV8718

      LDO Regulator, 300 mA, Wide Vin, Ultra-Low Iq

    • NCV1117

      LDO Regulator, Fixed and Adjustable, 1 A (Automotive)

    • NCV8730

      LDO Regulator, 150 mA, 38 V, 1 µA IQ, with PG

  • Low/Medium Voltage MOSFETs
    • NVMJST0D9N04C

      Single N-Channel Power MOSFET 40V, 300A, 1 mΩ on Top Cool Package

    • NVMJST1D3N04C

      Single N-Channel Power MOSFET, 40 V, 1.35 mΩ on Top Cool Package 

  • Temperature Sensors
    • NVT211

      ±1°C Digital Temperature Sensor with Series Resistance Cancellation

Technical Documentation

Evaluation Boards/Kits

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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