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":[]}]}]}]

Li-ion Battery Charger - Block Diagram

A Li-ion battery charger efficiently charges lithium-ion batteries by providing a controlled current and voltage. It ensures safe and fast charging.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "AC Input", "function": "Provides the alternating current (AC) power source for the charger.", "theory_of_operation": "The AC input is the initial power source that will be converted and regulated through various stages to charge the Li-Ion battery.", "interaction": "Feeds into the Filter & Rectifier stage.", "category": "Third party", "connection": [ "Filter & Rectifier" ] }, { "name": "Filter & Rectifier", "connection": ["PFC Stage"], "sub_blocks": [ { "name": "Filter", "function": "Smooths out the AC input signal, removing noise and harmonics.", "theory_of_operation": "Uses inductors and capacitors to oppose changes in current and voltage, respectively.", "interaction": "Feeds the rectified and filtered signal to the Bridge Rectifier block.", "category": "Third party", "connection": [] }, { "name": "Bridge Rectifier", "function": "Converts AC to DC.", "theory_of_operation": "Diodes allow current to flow in only one direction, thus converting AC input to pulsating DC output.", "interaction": "Supplies the DC output to the PFC Stage.", "category": "onsemi", "connection": [] } ] }, { "name": "PFC Stage", "connection": ["DC-DC Stage", "Auxiliary Power Supply (Opt.)"], "sub_blocks": [ { "name": "PFC Controller", "function": "Controls the power factor correction, managing the switching of iGaN or Power Discrete components.", "theory_of_operation": "Improves power factor and reduces harmonic distortion by adjusting the phase and amplitude of the current waveform.", "interaction": "Interfaces with the Gate Driver and iGaN/Power Discrete components.", "category": "onsemi", "connection": [] }, { "name": "Gate Driver", "function": "Provides the necessary gate drive voltages for the power switches.", "theory_of_operation": "Acts as an interface between low-power control signals and high-power switching devices.", "interaction": "Drives the gates of the iGaN and Power Discrete transistors.", "category": "onsemi", "connection": [] }, { "name": "iGaN", "function": "High-efficiency power conversion.", "theory_of_operation": "Offers fast switching and high efficiency due to the superior properties of GaN material.", "interaction": "Works with the PFC Controller and Gate Driver to perform switching operations.", "category": "onsemi", "connection": [] }, { "name": "Power Discrete", "function": "Power conversion and regulation.", "theory_of_operation": "These components perform actual power conversion tasks.", "interaction": "Controlled by the Gate Driver to manage power delivery.", "category": "onsemi", "connection": [] } ] }, { "name": "Auxiliary Power Supply (Opt.)", "connection": ["DC-DC Stage"], "sub_blocks": [ { "name": "Flyback Controller", "function": "Manages the flyback converter to provide isolated power.", "theory_of_operation": "Uses transformer-based isolation to step up/down voltages.", "interaction": "Controls the HV Power Switch.", "category": "onsemi", "connection": [] }, { "name": "HV Power Switch", "function": "Switches the primary side of the flyback transformer.", "theory_of_operation": "Manages energy transfer through switching.", "interaction": "Controlled by the Flyback Controller.", "category": "onsemi", "connection": [] }, { "name": "Rectifier & Protection", "function": "Converts AC from the transformer to DC and provides protection.", "theory_of_operation": "Diodes convert AC to DC; protection circuits safeguard the system.", "interaction": "Provides DC power to the Regulator.", "category": "onsemi", "connection": [] }, { "name": "Regulator", "function": "Ensures stable output voltage.", "theory_of_operation": "Maintains constant output voltage through feedback mechanisms.", "interaction": "Provides regulated power to system components.", "category": "onsemi", "connection": [] } ] }, { "name": "DC-DC Stage", "connection": ["Load Switch"], "sub_blocks": [ { "name": "Flyback/LLC Converter", "function": "DC-DC converter providing isolation and voltage transformation.", "theory_of_operation": "Uses transformer-based isolation with resonant switching.", "interaction": "Controls the HV Power Switch and iGaN transistors for power conversion.", "category": "onsemi", "connection": [] }, { "name": "HV Power Switch", "function": "Switches the primary side of the transformer.", "theory_of_operation": "Manages energy transfer through switching.", "interaction": "Controlled by the Flyback/LLC Converter.", "category": "onsemi", "connection": [] }, { "name": "iGaN", "function": "High-efficiency power conversion.", "theory_of_operation": "Provides fast switching and high efficiency due to GaN material properties.", "interaction": "Works with the Flyback/LLC Converter.", "category": "onsemi", "connection": [] }, { "name": "SR Rectifier", "function": "Improves efficiency by reducing rectification losses.", "theory_of_operation": "Uses controlled MOSFETs to reduce forward voltage drop.", "interaction": "Works with LV-MV MOSFETs.", "category": "onsemi", "connection": [] }, { "name": "LV-MV MOSFET", "function": "Efficient switching in the DC-DC stage.", "theory_of_operation": "Provides lower on-resistance and faster switching times.", "interaction": "Controlled by the SR Controller.", "category": "onsemi", "connection": [] }, { "name": "SR Controller", "function": "Manages synchronous rectification.", "theory_of_operation": "Controls MOSFETs for efficient rectification.", "interaction": "Interfaces with the SR Rectifier and LV-MV MOSFETs.", "category": "onsemi", "connection": [] } ], }, { "name": "Load Switch", "connection": ["Optocoupler", "Li-Ion Battery Pack"], "sub_blocks": [ { "name": "CC/CV Controller", "function": "Manages CC and CV charging phases.", "theory_of_operation": "Uses feedback to maintain constant current and voltage.", "interaction": "Controls the Protection circuits.", "category": "onsemi", "connection": [] }, { "name": "Protection", "function": "Provides protection against faults.", "theory_of_operation": "Uses sensing and cutoff mechanisms.", "interaction": "Ensures safety by interacting with the CC/CV Controller.", "category": "onsemi", "connection": [] } ] }, { "name": "Optocoupler", "function": "Provides isolation between high-voltage and low-voltage sections.", "theory_of_operation": "Uses LED and photodetector pairs for signal transfer.", "interaction": "Allows communication between different parts without direct electrical connection.", "category": "onsemi", "connection": ["DC-DC Stage", "Auxiliary Power Supply (Opt.)"] }, { "name": "Li-Ion Battery Pack", "function": "Stores energy for use in portable electronic devices.", "theory_of_operation": "Uses lithium-ion chemistry to store and release electrical energy.", "interaction": "Receives regulated power from the charger.", "category": "Third party", "connection": [] } ], "interconnections": [ { "source": "AC Input", "target": "Filter & Rectifier" }, { "source": "Filter & Rectifier", "target": "PFC Stage" }, { "source": "PFC Stage", "target": "Auxiliary Power Supply (Opt.)" }, { "source": "Auxiliary Power Supply (Opt.)", "target": "DC-DC Stage" }, { "source": "PFC Stage", "target": "DC-DC Stage" }, { "source": "DC-DC Stage", "target": "Load Switch" } { "source": "Load Switch", "target": "Li-Ion Battery Pack" } { "source": "Load Switch", "target": "Optocoupler" } { "source": "Optocoupler", "target": "Auxiliary Power Supply (Opt.)" } { "source": "Optocoupler", "target": "DC-DC Stage" } ], "Last_update": "2025-07-29"

Li-ion Battery Charger

Bridge Rectifier - Block

Products

  • Rectifiers

Technical Documentation

Evaluation Boards/Kits

  • EVBUM2901G-EVB

    Evaluation Board for Double Pulse Testing discrete solutions

FAQs

1. What are the main functional blocks in an industrial Li‑ion battery charger?

An industrial Li‑ion battery charger typically includes input protection, power factor correction or DC input conditioning, isolated DC/DC conversion, control and monitoring, and battery protection circuitry. These blocks work together to deliver regulated charging power while ensuring electrical safety and reliability.

2. How does power conversion efficiency impact industrial battery chargers?

Power conversion efficiency directly affects thermal performance, system size, and reliability. Higher efficiency reduces heat generation, simplifies thermal management, and enables more compact charger designs, which is critical for industrial systems operating continuously or in confined enclosures.

3. Why is controlled charging important for Li‑ion batteries?

Controlled charging is essential because Li‑ion batteries are sensitive to overvoltage, overcurrent, and temperature extremes. Precise regulation of charge current and voltage helps prevent degradation, improves battery lifetime, and reduces safety risks such as overheating or cell damage.

4. How does system monitoring improve battery charger reliability?

System monitoring improves reliability by continuously measuring voltages, currents, and temperatures. This enables fault detection, controlled shutdown, and adaptive charging behavior, helping prevent long‑term battery stress and unexpected system failures.

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.

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