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Rapid electronic fuse circuit

2017-08-11 05:59  
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This article explains the rapid electronic fuse circuit explanation. The circuit is simple but effective. For your more thorough grasp of this principle, we suggest that you can know more about some of the important components of the circuit, such as: TIC225M . When the current through the load exceeds a determined horizontal position of the wiper in the pot 1 k wound, this circuit cut off the load immediately. If S1 is open, the range is about 300 - 650 mA, 0.8 - 2 one when it is closed. The operation key variable is the voltage drop across the fuse Power resistor (s) in series with the load. This voltage drop is proportional to the current load attractive. When this current is low, the voltage across the resistor, is still small, can not trigger T1. At the same time, the door T2 is fed from a small power source based on a negative voltage regulator. T2 is conductive and load. If the current through the load then becomes too high, so that the voltage at the resistor created (s) can trigger the gate of T1 via resistor 330 r and the pot: T1 starts and rapidly take all of the current from the gate of T2. The voltage drop across T1 (MT1-MT2) will be only 0.7 V and T2 will be firmly closed. T1 remain this way until all the instantaneous (normally closed ", trying to break") the reset button is pressed: This allows current through T1 and troops to maintain the level below which the triac off. Release the reset button can also be re-opened and the flow of current through the gate of T2, switch. Must be a TIC225M T1, because this particular type has a very low triggering current. T2 is a snubberless bta12 - 600 Continuous wave can not be replaced with a "normal" triac, but maybe there bta12 - 600 - bw also be used without a buffer circuit, but is not so sensitive gate (not a problem in this design). If Gates snubberless triacs are DC control and they exchanged AC and DC control gates must be negative - flowing from the gate, a negative voltage regulator. The output AC voltage of 1 - 5 V lower than the input power level, depending on the load. Varistors are 250 v AC. Note that the "reverse" the polarity of electrolytic capacitors, diodes 7906 years. 



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