Overcurrent signaling device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network
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An excessive increase in current in the load can cause failure of the battery, rectifier and, as a result, malfunctions in the powered equipment. The device, the circuit of which is shown in the figure, will help you avoid adverse consequences by signaling with the D1 LED that the current limit has been exceeded.
The current-measuring circuit here is connected in series with the power supply to the load (resistor R1). When the voltage across the resistor reaches 0,6 V with increasing current, the SCR-1 trinistor opens and the LED lights up. The resistance of the resistor R1 is determined based on the level of permissible current. To do this, divide 0,6 V (trinistor opening voltage) by the value of the allowable current
The power dissipated in the resistor is found by multiplying the voltage of 0,6 V by the current flowing. For example, at a current of 1 A, the resistor dissipates 0,6 W, so a resistor with a power dissipation of 1 W is taken for the circuit.
Resistor R1 is selected during setup; SCR-1 parameters: Inom > 0,6A, Uwork > 50V; D1 can be taken by anyone.
Publication: N. Bolshakov, rf.atnn.ru
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