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":[]}]}]}]

EV Power Domain Controller - Block Diagram

The EV Power Domain Controller offers advanced power management and control solutions for domain based electric vehicles.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "12V / 48V Power Bus", "function": "Provides low-voltage power distribution for auxiliary systems.", "theory_of_operation": "Distributes regulated 12V or 48V power to various subsystems including auxiliary power and control electronics.", "interaction": "Feeds power to Auxiliary Power and other low-voltage components.", "category": "Third party", "connection": ["Battery Protection"] }, { "name": "400V-800V HV Battery", "function": "Primary high-voltage energy source for EV propulsion and charging.", "theory_of_operation": "Stores and supplies high-voltage DC power for traction, charging, and conversion systems.", "interaction": "Connects to Battery Protection and HV Power Distribution.", "category": "Third party", "connection": ["HV Power Distribution"] }, { "name": "Battery Protection", "function": "Protects the HV battery from overcurrent, overvoltage, and thermal faults.", "theory_of_operation": "Implements hardware and software safety mechanisms to disconnect or limit power flow during fault conditions.", "interaction": "Interfaces between HV Battery and HV Power Distribution.", "category": "onsemi", "connection": ["Auxiliary Power"] }, { "name": "Auxiliary Power", "function": "Generates regulated low-voltage power from HV sources.", "theory_of_operation": "Uses DC-DC converters to step down HV battery voltage to 12V/48V for auxiliary systems.", "interaction": "Receives power from HV Battery and distributes to low-voltage bus.", "category": "onsemi", "connection": ["Digital Isolation"] }, { "name": "Digital Isolation", "function": "Provides galvanic isolation between high-voltage and low-voltage domains.", "theory_of_operation": "Uses capacitive, magnetic, or optical isolation techniques to safely transmit signals across voltage domains.", "interaction": "Connects MCU to Memory & Interface and other control blocks.", "category": "onsemi", "connection": ["Memory & Interface"] }, { "name": "Memory & Interface", "function": "Stores firmware and facilitates communication between MCU and peripherals.", "theory_of_operation": "Includes non-volatile memory and interface ICs for data exchange and control.", "interaction": "Connected to MCU.", "category": "onsemi", "connection": ["MCU"] }, { "name": "MCU", "function": "Central controller for EV power domain logic and coordination.", "theory_of_operation": "Executes embedded software to manage power distribution, protection, and communication.", "interaction": "Interacts with sub-blocks", "category": "Third party", "connection": ["Memory & Interface", "In Vehicle Networking", "Auxiliary Power", "HV Power Distribution"] }, { "name": "ESD Protection", "function": "Protects communication interfaces from electrostatic discharge.", "theory_of_operation": "Uses transient voltage suppression devices to clamp voltage spikes.", "interaction": "Placed at communication ports and interfaces.", "category": "onsemi", "connection": ["In Vehicle Networking"] }, { "name": "In Vehicle Networking", "function": "Handles data exchange between ECUs and vehicle systems.", "theory_of_operation": "Implements CAN, LIN, Ethernet, or other automotive protocols.", "interaction": "Connects to Domain Gateway and MCU.", "category": "onsemi", "connection": ["Domain Gateway", "MCU"] }, { "name": "Domain Gateway", "function": "Manages communication between power domain and vehicle control unit.", "theory_of_operation": "Acts as a protocol translator and data router.", "interaction": "Interfaces with Upstream and Downstream Communication and MCU.", "category": "Third party", "connection": ["Vehicle Control Unit", "EV Power Domain - HV Loads & ECUs",] }, { "name": "HV Power Distribution", "function": "Distributes high-voltage power to critical EV subsystems.", "theory_of_operation": "Uses contactors, fuses, and busbars to route HV power to loads.", "interaction": "Feeds power to EV Power Domain - HV Loads & ECUs", "category": "onsemi", "connection": ["EV Power Domain - HV Loads & ECUs",] }, { "name": "EV Power Domain - HV Loads & ECUs", "connection": [], "sub_blocks": [ { "name": "On Board Charger", "function": "Converts AC from external source to DC for battery charging.", "theory_of_operation": "Uses power conversion stages to rectify and regulate charging current.", "interaction": "Receives HV power from HV Power Distribution.", "category": "Third party", "connection": [] }, { "name": "BMS", "function": "Monitors and manages battery health and performance.", "theory_of_operation": "Measures cell voltages, temperatures, and balances charge across cells.", "interaction": "Receives power and communicates with MCU.", "category": "Third party", "connection": [] }, { "name": "Traction Inverter", "function": "Drives the electric motor using HV DC power.", "theory_of_operation": "Converts DC to 3-phase AC using IGBT or SiC-based inverter topology.", "interaction": "Receives HV power from HV Power Distribution.", "category": "Third party", "connection": [] }, { "name": "HV-LV Converter", "function": "Steps down HV to LV for auxiliary systems.", "theory_of_operation": "DC-DC converter topology for efficient voltage conversion.", "interaction": "Receives HV power and supplies LV bus.", "category": "Third party", "connection": [] }, { "name": "HV Loads", "function": "Includes various high-voltage actuators and systems.", "theory_of_operation": "Operates directly from HV supply for propulsion or thermal management.", "interaction": "Powered by HV Power Distribution.", "category": "Third party", "connection": [] }, { "name": "Power Domain ECUs", "function": "Control and monitor specific HV subsystems.", "theory_of_operation": "Embedded controllers with dedicated functions for each HV load.", "interaction": "Communicate with MCU and receive HV power.", "category": "Third party", "connection": [] } ] }, { "name": "Vehicle Control Unit", "function": "Central vehicle controller managing all domain gateways.", "theory_of_operation": "Coordinates vehicle-wide operations and diagnostics.", "interaction": "Communicates bidirectionally with Domain Gateway.", "category": "Third party", "connection": [ "Vehicle Control Unit : Domain Gateway" ] } ], "interconnections": [ { "source": "12V / 48V Power Bus", "target": "Battery Protection" }, { "source": "Battery Protection", "target": "Auxiliary Power" }, { "source": "400V-800V HV Battery", "target": "HV Power Distribution" }, { "source": "Auxiliary Power", "target": "12V / 48V Power Bus" }, { "source": "Digital Isolation", "target": "Memory & Interface" }, { "source": "Memory & Interface", "target": "MCU" }, { "source": "MCU", "target": "Digital Isolation" }, { "source": "MCU", "target": "Memory & Interface" }, { "source": "MCU", "target": "In Vehicle Networking" }, { "source": "MCU", "target": "Domain Gateway" }, { "source": "MCU", "target": "HV Power Distribution" }, { "source": "ESD Protection", "target": "In Vehicle Networking" }, { "source": "In Vehicle Networking", "target": "Domain Gateway" }, { "source": "In Vehicle Networking", "target": "MCU" }, { "source": "Domain Gateway", "target": "Vehicle Control Unit" }, { "source": "HV Power Distribution", "target": "On Board Charger" }, { "source": "HV Power Distribution", "target": "BMS" }, { "source": "HV Power Distribution", "target": "Traction Inverter" }, { "source": "HV Power Distribution", "target": "HV-LV Converter" }, { "source": "HV Power Distribution", "target": "HV Loads" }, { "source": "HV Power Distribution", "target": "Power Domain ECUs" }, { "source": "Vehicle Control Unit", "target": "Domain Gateway" } ], "Last_update": "2025-08-26"

EV Power Domain Controller

In Vehicle Networking - Block

Products

  • Ethernet Controllers
    • T30HM1TS2500

      10BASE-T1S Ethernet Controller, Treo Platform, MAC-PHY with SPI Interface

    • NCV7410

      Ethernet Controller, 10 Mb/s, Single-Pair, MAC + PHY, 802.3cg, 10BASE−T1S Compliant

  • Wired Transceivers & Modems
    • NCV7342

      CAN Transceiver, High Speed, Low Power

    • NCV7343

      CAN FD Transceiver, Low Power, with INH, WAKE and Error Detection

    • NCV7329

      LIN Transceiver, Stand-alone

    • NCV7344

      CAN FD Transceiver, High Speed, Low Power

    • NCV7357

      CAN FD Transceiver, High Speed

    • NCV7451

      System Basis Chip with CAN FD, LDO Regulator and Wake-up Comparator

    • NCV7450

      System Basis Chip with CAN FD, LDO Regulator and HS Driver

    • NCV7422

      Dual LIN Transceiver

Technical Documentation

Evaluation Boards/Kits

FAQs

1. Why do electric vehicles use a power domain controller?

EVs use a power domain controller to simplify electrical architecture and improve reliability. It consolidates power control functions that were previously spread across many ECUs, enabling coordinated energy management, consistent protection behavior, fewer harnesses, and better diagnostic visibility across the vehicle.

2. What functions are typically integrated in a power domain controller?

A power domain controller typically integrates sensing, protection, switching, and communication functions. It may include current and voltage measurement, temperature monitoring, pre-charge control, high-side/low-side switching, load control, wake/sleep management, and network interfaces for coordination with other vehicle controllers.

3. How does a power domain controller interact with DC-DC converters and the BMS?

It interacts by exchanging status and control signals over in-vehicle networks. The power domain controller can request converter modes, control low-voltage rail sequencing, and coordinate with the BMS for permitted power states, pre-charge, contactor timing, and fault responses during driving, charging, and shutdown events.

How does centralized power control benefit EV architecture design?

Centralized power control benefits EV architecture by reducing wiring harness size, lowering weight, and improving manufacturability. It also enables modular vehicle platforms, making it easier to scale designs across different vehicle segments and powertrain configurations.

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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