Current sampling resistor selection considerationsin power tools, solar products, battery protection board, power supply design, sampling is the eternal topic. Whether for general current control circuit, adjust, or over current protection, short circuit protection, issues to be considered are the first step is to detect the current size.
current use two sampling methods, is a current transformer, is another current sensing resistor. Current transformers in some large current test performed well, but due to the expensive, often for small amount, and places no requirements on the cost. So all kinds of power supplies, power tools, battery protection board, lights, drive motor or product mainstream places such as the power supply is economic, high efficient and practical second way, which is described in alloy resistance, used as a current sample.
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