Published:2011/5/24 23:45:00 Author:Ariel Wang | Keyword: switching-regulator circuit, waste, evergy-saving lamp | From:SeekIC
When it isbeingused,it's not proper to take voltage from C5 directly. It's imposible to allow short circuit happened, otherwise it'll burn V1 and V2. Because when short circuit takes place,the electric currentin coil LO of flyback transformer B1 will increase rappidly.The voltage of coil L1 and L2 increases to a rather high level.It gives back the electric currentin V1 and V2 increasing as well. It causes intensive positive feedback.Finally it burns out as the limitation of power consumption of V1 and V2. This feedback of circuit belongs to series circuit feedback.And it can openand protectcircuit. But when load is increased,the feedback is strenghened.What's more,the frequency will decrease as the load increases. The internal resistance is rather small,so short circuit will burn pliotron very easily.
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