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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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