On a simple FWB rectifier with a high? C filter cap....... is the result? ?RMS? I(C1).....? the same as the AC ripple current going into the cap ????
On another note ( using the same above config)? I noticed that the RMS xfmr current I (T1)? x RMS V(T1)? ?results in a LOT more rms AC power.....? ? vs just the V(L1) x? I (L1).....? like a lot more, like 53.7% more.
Put another way? DC load power / AC power? = .65? ?Am I assuming the Power factor is just .65??
On another note ( using the same above? FWB + filter cap config).....when comparing V (T1)? ?vs I (T1)? ...under full load..... that the peak of the current pulse sits dead center in the middle of the (now flattened to a straight line)? peak of the voltage.?
I believe the flattened? Voltage portion is what is causing the harmonics going back into the mains V.?
It also appears that there is no leading / lagging going on.? The top of the current pulse is dead center in the flattened portion of the top of the voltage peak.?
Since there appears to be no leading / lagging..... where is the lousy...'apparent power factor'? coming from ???
The config is as follows.?
Plate xfmr? with 240 vac input? ( 60 hz)....and a 5225 vac secondary ( no load).? Hypersil C core xfmr.?
.1 ohm dc pri resistance.? And a 6.0 ohm dc sec resistance.? ?Source resistance = 53.39 ohms.? Sec winding rated at 3 amps CCS.? ?Xfmr weight = 253 lbs.?
FWB consists of 24 x 6A10 diodes ) 1 kv piv / 6 amps CCS / 400 amps surge rated)? in series? for EACH of the 4 x legs of the FWB.? ? Then two identical FWB assy's are wired in parallel. 192 x diodes in total used.
Filter cap is? 800 uf? ( 25 x 10,000uf? @ 450 vdc lytics in series, each with a 100k @ 3 watt, 1%? MOF across each cap? ( aka...'eq' resistors).? 2 x banks of caps are wired in parallel ( 400+400 = 800 uf).
Each cap is just .0159 ohm for ESR? @ 120 hz.? ?Total for the 50 x lytics =? .19875 ohms.? Each lytic is 3.0" diam x 8.625" tall.. .and weigh 3.3 lbs each. Ripple current rated at 21.6 amps CCS.
I have been using PSUD-2 in various high voltage configurations for eons now.? FWCT, FWB, FWD.? ?Plane C filter....and also a C-L-C? configuration .? ?For the C1-L-C2 config, I noticed that the C2 cap has to be a bare minimum of at least the same value as the C1 cap....and preferably a lot more.? ?If the C2 cap is lower than the C1 cap value, the output DC? voltage oscillates wildly, till it finally settles down.? ?I also have the option of shunting out the L ( via a vacuum relay) to turn it into one big C filter.? ?I also installed an adjustable spark gap across the 4H choke terminals.? ( choke is also a hypersil C core type, 127 lbs, and rated for 3 amps CCS? and 10 kvdc).? ?For safety purposes, the entire choke is well insulated from the bottom of the rack cabinet.?
I have built plenty of HV? B+ supplies over the years.? I'm just not clear on the 'apparent PF' issue, V flattening / harmonics . AC ripple measurements.
Any insight would be greatly appreciated.?
