Hi, For different reasons, I am designing a custom battery charger for an 12Vdc 100amps AGM battery. I use a PWM control circuit, but the driving Mosfet tend to heat a lot. The actual circuit simply switch the input DC source (solar panels) using a power mosfet directly in the battery trough diodes. I tough that adding a coil between the mosfet output and the battery may help to lower the heat dissipated but the mosfet. I need help figuring out how to compute the proper inductance value in relation with my switch frequency. So any help will be welcome. Maybe I am wrong, and the coil will not help at all. Your input will be welcome. Input DC voltage vary from 12 to 22Vdc approximately while the battery will peak around 15Vdc, I try to keep current constant using the PWM. The circuit is working, but heat a lot. Peak current may raise to 10amps when running in bulk charge.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so itâ€™s critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Download Now
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now