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Tag search results for: "pfc inductor"
1. In close to the maximum input voltage when the PFC inductors
began to ring, listen to the sound frequency at 100HZ; this situation
is generally self-supply winding voltage amplitude is low, reaching ZCD
feet less than 1.4V (L6562A), resulting in MOS tube is not open , After
this period of time, only to open, so there will be 100HZ sound, as
shown in the picture, increase the number of self-power cycle can be.
2. Loop problem, this can directly adjust the resistance parameters can be, nothing to say.
3. No paint, resulting in magnetic core or line package vibration; dipping can solve the problem.
4. Although dipping, but if the magnetostrictive, then the need for mid-point glue.
5.PFC inductance saturation by PFC inductors manufacturer , you can detect the CS pin current waveform (detection of resistance over the voltage waveform), the end of the current waveform in the tail, that is saturated.
6. Current waveform cut top, the oscilloscope 2.5ms, see the CS pin of the entire cycle of the current waveform, in the top part of the cut, if the top of the cut, the sampling resistor to reduce the point.
7. Wiring problems; just remember that the chip to the VCC electrolytic ground and then go to BUCK capacitor ground / rectifier bridge behind the polypropylene capacitor, there is no problem; all the "ring" are small amount of energy.
more transformer in www.xp-elec.com
2. Loop problem, this can directly adjust the resistance parameters can be, nothing to say.
3. No paint, resulting in magnetic core or line package vibration; dipping can solve the problem.
4. Although dipping, but if the magnetostrictive, then the need for mid-point glue.
5.PFC inductance saturation by PFC inductors manufacturer , you can detect the CS pin current waveform (detection of resistance over the voltage waveform), the end of the current waveform in the tail, that is saturated.
6. Current waveform cut top, the oscilloscope 2.5ms, see the CS pin of the entire cycle of the current waveform, in the top part of the cut, if the top of the cut, the sampling resistor to reduce the point.
7. Wiring problems; just remember that the chip to the VCC electrolytic ground and then go to BUCK capacitor ground / rectifier bridge behind the polypropylene capacitor, there is no problem; all the "ring" are small amount of energy.
more transformer in www.xp-elec.com
