Capacitor-input filters produce higher output voltages; hence, the output at the filter can be made to rise with increased load current. The secondary of the small power tranny was connected to the 6. The 2 major limiting factors of early Valve amps before the solid-state technology arrived was the valve rectifier and small Electrolytic capacitors. The power supply on a separate chassis solves the problem of the power tranny external magnetic field contaminating the valve amps electronics, whereas a mono-block does not. Having said that however, should you find that it is of value to you, and wish to make a contribution to the ongoing viability of this site, I have set up PayPal account for your convenience and hereby express my gratitude for whatever you may be able to forward. Having said all that, there is some research on driving SMPS output inductor into saturation.
I gather though that even that version would not really protect the VFD from line side problems, only load side. Hi jraef I believe that the level of output protection provided by the DC bus choke is somewhat limited compared to the line reactors and would suggest that the prime use is to improve the rectifier conduction angles and reduce the harmonics. Ok, Let me see if I have this right? Mario Maggi - Italy - http:
A high-frequency swinging choke which has at least two rod cores arranged next to one another in the longitudinal direction is specified. I understand that you are trying to simulate it. But the choke in the choke-input system can be allowed to saturate quite a lot at full load provided it gives a high inductance at critical load. As a result of optimized rod cores, the high-frequency swinging choke has only comparatively minimal losses. If you take the standard choke that is used an just split the winding in half with one half in the positive leg and one half in the negative leg, the additional cost is not too bad, certainly not as bad as two separate reactors.
By properly choosing the size of the air gap, a special action is produced. Some valve amp manufacturers today, who cater to the occult market, use rectifier valves and old style Electros. The waveform of the current I out flowing through R is identical to that of V out the load being purely resistive , and then has the same spectral composition. Yes, I have done the little cap across the choke also, a good use for all those little value oil filled caps! I wonder if its possible to build such a choke maybe with a angled gap? In the capacitor-input system, the important thing is to ensure adequate smoothing inductance at full load current, and to avoid saturation of the choke core a gap must be left in it, which necessitates more turns to keep up the inductance and therefore more resistance or higher cost. The rectifier used in conjunction with choke-input is usually a gas-filled type, because that has negligible slope resistance and so promotes the constancy of output voltage.