Simplified load current strength indicator circuit diagram

Published:2011/9/6 21:16:00 Author:Vicky | Keyword: load current strength indicator | From:SeekIC

The light strength in the picture is proportional to the load current. The purpose of designing the circuit is to provide a very compact circuit to take the place of electricity meter of 12 V power line in some astronomical devices. The devices contain small-power heating components of invisible working state. However, when the heater is connected, LED would send out light to indicate clearly that they’re connected and working. The circuit analysis is very simple. The voltage of the two ends of 22ohms resistance is the same with the voltage of the two ends of RSENSE. The current going through the 22 ohms resistance is the same with the current going through LED. Therefore, as to the parameter given by the picture, the current of LED current equals 0.05/22 of the load current. When the load current changes from 200mA to 6.6A, the light of LED becomes fully lighted from weak (confined by 680 ohms resistance).



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