![]() ![]() We have the MAX4081FASA which is a bidirectional current sense IC that can handle a max VCC of 76V which is more than enough for our applications. Here we have the heart of the over-current detection. Lets first discuss the over-current/short-circuit protection sections of the circuit: Bidirectional Current sensor Here in this section I will discuss the project in more detail by talking about the different sections used to create this whole circuit. ***Theoretical the supervisor IC will latch when the overcurrent protection section detects its threshold. This will change slightly when using more cells in series **Quiescent current has not been measured yet but it is below 1mA during normal operation with a 4S battery. ![]() ![]() *Maximum current passing through this board will depend on sizing and adding a heatsink to the power mosfets Here are some more technical details of this project In the next sections I will discuss in more detail this project. Theoretically 45-50A pass-through current ( will require heatsink).Under voltage protection for the whole battery pack.Over current protection with output latch open when tripped.Adding heatsink is necessary to allow more current One thing to note before hand is that the current maximum current that can flow is about 5A due to lack of heatsink on the powerFETS. The protection board I’ve designed has bidirectional current detection (can detect charging and discharging currents) which in turn means you can set independent OCP( over-current protection) for discharging current and charging current. I didn’t really trust the cheap low cost protection boards you find online so I decided to try and create my own. This project was created in order to provide protection for my battery projects. If you can afford to donate anything via Paypal i would great appreciate it. I strive to provide my content for free without using ads as I personally do not like ads in most website. ![]()
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