Switching power supply positive circuit, please help explain, the core of the reset circuit is how to work, has not been confused
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Very simple reason ah, switch tube conduction time, NP winding voltage, current is on the positive negative, while the secondary NS voltage is also under the negative, to the load power supply, and NR winding voltage is negative, due to Diode DR one-way conductivity, NR winding no current. This stage of the NP winding magnetizes the core. When the switch off, the winding voltage polarity are reversed, NP, NS winding no current, and NR winding (voltage is negative) through the power and DR to form a loop, the winding current is negative, to the Core demagnetization, while the energy back to the power supply (to the power supply filter capacitor charge), but also to prevent the NP winding to produce too high anti-peak voltage breakdown of the switch tube, serve three purposes.
