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    Performance detector with 555 ----- NE555 OVER CURRENT DETECTER

    Use 555 to perform an overflow detector, Ne555 Over Current Detecter Keywords: Transport detector with 555 For a long time, it has been introduced that the 555 Timer IC application circuit has a variety of articles, but it is not commonplace with the 555 internal comparator and the double-steady flip-flop to form an overcurrent detector. This circuit is ingenious, the work is reliable, the yuan is cheap and easy to buy, it is recommended. When the load current is too large, the 3 foot of 555 (1C1) is low, and it is necessary to press the reset switch S1 (of course, only if the load current is restored to the qualifier, 3 foot is again increased again. possible). 3 Trips of the pin output level can be used to control alarm, indicator, current flow, or other circuitry required to control. The resistance R2 is actuated by the current sensor. Since the two-end pressure drop is not used to drive the transistor, it can be made small. Thus, the power supply voltage obtained by the load is close to the power supply voltage of the circuit, and the power loss of R2 itself is small. Inside 555, the 3 foot and ground is a voltage divider, which provides a reference voltage for one input of the two comparators. Another input of these two comparators is connected to the reset button S1 and the potentiometer P1 by 2 feet and 6 feet, respectively. The output of the comparator controls the setting and reset input of the internal dual-steady flip-flop, respectively. The output terminal of the double steady flip-flop is connected to the external circuit provides an output signal. Before use, the P1 is adjusted without the load RLOAD, so that the 6 foot voltage is below 2/3 power supply voltage. In use, if the 8 foot voltage is too much due to excessive load current, the 6 foot voltage becomes higher than 5 feet. As a result, the comparator that receives 6 foot changes, so that the double steady flip flop is reset, the 3 foot becomes low. This state is maintained until the pressing reset switch S1 is pressed. At this time, S1 pulls the inverting input of another comparator to the ground, the comparator is changed and sets the double-stable trigger, and the 3 foot will output high electricity again. flat. This circuit can work normally at 5-14.5V power supply, and the current consumption at 10V is about 7 mA. Note that this picking will make the 8 foot voltage below the other feet, but according to the manufacturer's data, there is no problem as long as this voltage difference is not more than 300mV.
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