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Trasnformer feedback winding magnetic flux behaviour

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gkmaia:
If you look at the schematic bellow you will see T460 is a high frequency high voltage transformer.

On T460 the primary winding 4-5 receives 120VDC from the mains transformer. The feedback winding 3-6 switches Q458 on and off and that allows the primary to generate magnetic flux.

What I am curious to know are the physical/electrical principles that causes the feedback winding magnetic flux to start/collapse and turn on/off Q548.

Md Mubdiul Hasan:
Hello Sir GKmaia,

Recently I am doing similar project on a Class D amplifier used to run  a potential and a current transformer.

The transformer input and output impedance need to be calculate. Interesting to see its " phase shift" behavour at high or low frequency.

People also curious about" core saturation" effect.
"A product with a Class-D audio power amplifier (APA) driving an output transformer with inadequatelow-frequency performance may shut down when its output is stepped from zero to maximum at the start of a sine cycle. Shutdown is triggered by short circuit protection (SCP), after the first half cycle of the sine output. The root cause is saturation of the transformer core."

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