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":[]}]}]}]

OBC with DC/DC Converter - Block Diagram

On board charger converts AC power from the grid to DC power to charge the EV battery. DC/DC Converter steps down battery voltage to a lower voltage.

OBC with DC/DC Converter

BJTs & BRTs - Block

Products

  • Digital Transistors (BRTs)
    • NSBCMXW

      Bias Resistor Transistors (BRT) NPN, 50 V, 100 mA

    • MUN2236

      NPN Bipolar Digital Transistor (BRT)

    • EMD4DXV6

      Complementary Bipolar Digital Transistor (BRT)

  • General Purpose and Low VCE(sat) Transistors
    • NSS1C300CT

      100 V, 3A, Low VCE(sat) PNP Bipolar Junction Transistor

    • NST60100T

      60 V, 10A, Low VCE(sat) PNP Transistor

    • MJK44H11T

      80 V, 8A, Low VCE(sat) NPN Transistor

Technical Documentation

Evaluation Boards/Kits

FAQs

1. What is the PFC stage in an OBC, and why is it important?

The PFC stage converts AC grid power into a regulated DC link for battery charging while maintaining high power factor and low harmonic distortion. It improves charging efficiency, ensures compliance with grid standards, and stabilizes input current across different power levels and grid conditions.

2. What role does the isolated DC/DC stage play in the OBC system?

The isolated DC/DC stage converts the regulated DC link voltage to the battery voltage while providing galvanic isolation. This stage enables safe charging of 400 V or 800 V battery packs, supports bidirectional power flow when required, and allows flexible voltage adaptation across different vehicle platforms.

3. Can an OBC with DC/DC converter support bidirectional operation (V2G/V2L)?

Yes, an OBC with a DC/DC converter can support bidirectional operation where applicable. Bidirectional capability allows energy to flow from the vehicle battery back to the grid or external loads, enabling vehicle-to-grid and vehicle-to-load use cases using compatible PFC and DC/DC topologies.

4. What challenges do designers face when integrating OBC and DC/DC functions?

Designers must manage efficiency, thermal performance, isolation, EMI, and safe operation across wide voltage and power ranges. Integrating multiple power stages increases system interaction, making careful topology selection, sensing, protection, and layout essential for reliable and compliant operation.

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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