Automatic 2S Li-ion Charger Control

@tshibsamuel477

Hi there, I have carefully reviewed your 2S Li-ion charger disconnect/reconnect requirements and can design the complete comparator-based control circuit around the TP5100 charging module. With nearly five years of experience in mechatronics, analog electronics, battery-powered systems, MOSFET switching, protection circuits, and PCB design, I can develop a compact solution with well-defined hysteresis at approximately 8.4 V OFF and 7.2 V ON, while minimizing losses, preventing adapter back-feed, and avoiding threshold oscillation. I will provide the complete schematic with calculated component values, simulation/verification files, BOM, and a concise design note explaining the comparator, hysteresis network, switching device, and protection strategy. Please send me a message so we can confirm the TP5100 module version, charging current, and required standby-current target. Best regards, Samuel tshibangu

@Amidst

Hey there! I’m Alok, A PCB, Circuit and Mechanical designer with a passion for turning ideas into rock-solid, high-performance circuit boards. even expert on Python, C, C++ With nearly a decade of experience, I’ve tackled everything from compact consumer gadgets to complex industrial systems—always with a focus on precision, efficiency, and reliability. # Schematic & Layout Design – Clean, optimized, and manufacturable. # Component Selection & Library Management – No surprises, just the right parts for the job. # Reverse Engineering – PCB cloning, replication, and improvements. # Gerber, BOM & CPL Generation – Ready for seamless production. # DFM & DFA Expertise – Because great design means smooth manufacturing. # Multi-Layer, Flex, & High-Density PCB Design – Whatever the project needs. If you need a PCB and Code that’s efficient, reliable, and built for real-world performance, let’s chat. I’d love to help bring your project to life!

@Mahmoud00Ibrahim

Hello, I’m an experienced Hardware Design & PCB Engineer, and I can design this **2-cell Li-Ion charger disconnect circuit** with precise 8.4 V turn-off and ~7.2 V turn-on thresholds. I’ll use an LM393 or a suitable low-power comparator with a properly calculated hysteresis network, ensuring stable switching without oscillation. The switching stage will be selected based on the required current, with reverse-current/back-feed protection and low conduction losses. **Deliverables:** * Complete schematic with calculated component values and reference designators * LTspice/KiCad/Proteus simulation or verification files * Threshold and hysteresis verification for 8.4 V OFF / ~7.2 V ON * Design note explaining the comparator, hysteresis and protection * Distributor-ready BOM with practical, readily available components I’ll also account for the TP5100 charging path and make sure the disconnect stage behaves reliably across the full battery voltage range. I’m ready to review the charger/load current and TP5100 setup and start the design. Best regards, Mahmoud

@mahmoudralizadeh

Hello, I’m a Senior Electronics & Embedded Engineer with a Master’s degree in Electrical/Electronics Engineering and over 8 years of experience in electronics design and development. My core expertise includes: • Analog and digital circuit design • Embedded systems and firmware development using STM32, ESP32, and microcontrollers • FPGA and VHDL development • DC-DC and DC-AC converter design • Power electronics and power supply design • PCB design using Altium Designer • Signal processing and hardware development • Circuit simulation using LTspice and PSpice • Hardware debugging, testing, and optimization I can handle projects from requirements analysis and initial concept through circuit design, simulation, PCB design, firmware development, prototyping, testing, and final documentation. My focus is on delivering practical, reliable, and production-oriented engineering solutions that meet project requirements and real-world constraints. Examples of my previous projects and technical work are available in my portfolio, where you can review my experience and capabilities.

@alluankit01

Hi, I can design the automatic 2S Li-ion charger control circuit using a comparator-based hysteresis stage to disconnect charging at 8.4V and reconnect around 7.2V. My approach will be to first confirm the TP5100 module current, battery pack capacity, adapter rating, load connection, and preferred switching method. Then I’ll design a reliable LM393 or equivalent comparator circuit with proper voltage divider values, hysteresis network, MOSFET/relay switching, reverse-current protection, and stable threshold behavior. I’m comfortable with: * Li-ion charger control circuits * LM393 comparator design * Hysteresis threshold calculation * MOSFET/relay switching * Reverse/back-feed protection * LTspice/Proteus simulation * Analog circuit documentation * BOM preparation Deliverables: * Complete schematic * All component values and reference designators * Simulation/verification file * Turn-off and turn-on threshold proof * No-oscillation behavior check * Design note explaining hysteresis and switching * Protection component explanation * Distributor-ready BOM I’ll focus on a compact, reliable, easy-to-layout circuit that safely controls the TP5100 charging path while keeping the original charger/BMS protection behavior intact. Best regards Ankit

@ElecHamza

Hi, I can design a reliable hysteresis cut-off circuit for your two cell battery pack with precise switching at eight point four volts and reconnection at seven point two volts. I will build the comparator stage using an LM393 with a stable reference, paired with a low loss P-channel MOSFET to eliminate back-feeding and switching chatter. You will receive the complete schematic with exact component values, simulation files verifying threshold stability, a full bill of materials, and a clear design note covering the circuit operation. Best regards

@anjalio22

I can design and verify a compact, reliable automatic 2S Li-ion charger control circuit around your TP5100, with precise 8.4 V cutoff and approximately 7.2 V reconnect hysteresis. I’ll provide the complete schematic with calculated resistor values, LM393 or a suitable low-power comparator, MOSFET/relay switching stage, reverse-current protection, filtering and transient protection. I’ll also verify the thresholds and hysteresis in LTspice/Proteus (or equivalent), including startup, switching transitions and no-oscillation behavior. Deliverables will include: Production-ready schematic with reference designators and values Simulation/verification files and threshold plots Concise design/protection documentation Distributor-ready BOM with manufacturer/part details Layout-oriented component recommendations for a compact PCB I’ll pay particular attention to comparator reference accuracy, hysteresis tolerance, MOSFET losses, leakage/back-feed prevention, and safe interaction with the TP5100 charging path. Give me one opportunity to handle your project. I assure you I will deliver accurate, practical engineering work with full dedication and professionalism.

@bhargav922002

With over a decade of experience as a web and app developer, I possess the unique ability to seamlessly blend my digital expertise with sound electrical engineering knowledge. This versatility means that not only can I provide you with a compact and reliable 2S Li-ion charger control schematic but set it up for quick PCB layout. My familiarity with an array of digital software such as Proteus, Altium, KiCad, and more will ensure the simulation and verification files you receive yield accurate results. I understand the importance of precision in your project, down to the smallest details. I assure you that your Low voltage cutoff for a 2S Li-ion pack (8.4V when full) will be meticulously taken care of. I not only design circuit boards but provide full BOMs which ensures faster implementation once the designs are ready. In conclusion, when you hire me, you gain access to skillset that allows you to transcend barriers between realms. I look forward to collaborating with you on this transformative endeavor!

@HamiltonNTC

I am an Electrical and Embedded Systems Engineer with experience in PCB and circuit design. I can design and verify your LM393/MOSFET voltage control circuit, including the 8.4V OFF and ~7.2V ON hysteresis thresholds, simulation, schematic, BOM and a short design note. I can deliver a reliable, compact solution ready for PCB layout.

@poojitham18

Hi i have more than 12 years experienced in circuit design and development in my past i have designed lot of bms circuit for companies i can design best way under emiemc

@brserisen

Hello. As an electrical and electronic engineering student with practical experience in analog circuit design, power electronics, and PCB development (including boost converters and automatic control circuits designed using Proteus and similar tools), I would like to assist you with your 2S Li-ion charger project. I can provide a precise schematic using the LM393, a stable hysteresis loop, reliable simulation files, and a complete, production-ready bill of materials (BOM). To efficiently bring this project to life, simply send me a message so we can discuss the details.

@Vimtex

Hello, I have great experience of PCB design and hardware design with BMS design of Passive and Active balancing. The quality of work will be great.

@milanc46

Li-Ion Battery | LM393 Comparator | Hysteresis | MOSFET | LTspice Hi there, I understand you need a reliable automatic charge-control circuit for a 2-cell Li-ion pack, switching the 9 V adapter path OFF at 8.4 V and back ON around 7.2 V with stable hysteresis and no back-feeding. Tech Stack: ■ LM393 / Precision Comparator ■ N/P-MOSFET / Relay Switching ■ Li-ion Battery & TP5100 ■ LTspice / KiCad ■ Protection & Hysteresis Design My Approach: ■ Design the comparator and hysteresis network for accurate 8.4 V / 7.2 V thresholds. ■ Select a low-loss switching device with appropriate reverse-current protection. ■ Verify the circuit through simulation for threshold accuracy and stable switching. ■ Provide the complete schematic, design notes, simulation files, and distributor-ready BOM. Guarantee: ■ Complete schematic with component values/reference designators ■ Verified turn-ON/OFF thresholds ■ No-oscillation operation ■ Protection against back-feeding ■ Compact, PCB-ready design Queries: ■ Is the TP5100 module already fixed for the design? ■ Do you have a preferred MOSFET or PCB size constraint? I have worked on similar electronic projects and am based in Ahmedabad, so I can better assist you with the project and coordinate easily if any hardware/prototyping support is required. Regards, Milan

@nehavaddellu

As a seasoned Electronics & Communication Engineer, I have extensive experience in designing custom hardware for large and small scale projects. My specialization in schematic capture and PCB layout makes me an ideal fit for this project. I have already employed 2-cell Li-ion pack control circuits and voltage-comparator stages in numerous designs, including those with hysteresis networks like yours. My proficiency in popular design tools such as LTspice, KiCad, and Altium ensures accurate simulations and the generation of verification files that we need to test the performance of your circuit's components. This way, we can minimize any design flaws and achieve your desired voltage "OFF" (8.4V) and "ON" (≈7.2V) thresholds with rock solid stability. In addition to providing you a ready-to-use schematic, simulation files, and BOM, my commitment to clear communication ensures a well-documented design note that explains how each component works together to achieve your desired functionality. Trust me with your project to receive timely deliverables and attain a compact, reliable design configured for quick PCB layout without compromising on performance or producibility. Let's electrify your home-electronics product with precision!

@malindu0027

Hello, I will deliver production ready design files and simulation with evidence showing hysteresis control within 1 day. Looking forward to working with you. Best Regards.