AC reduced in voltage to half wave DC for higher amps output?

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russwr

Joined Aug 29, 2017
51
User


A 500 Watt inverter has secondary windings of gauge magnet wire for expected use at 4 1/2 amps at 110v AC. Can this be used as half wave DC rectification at a different , lower, 35 volts pulsing DC, to use the higher value 10.5 amps output at electrical load resistance? The 2 electrical loads are 4.5A 100% on duty cycle and 6 Amps 34% duty cycle on. Maybe the secondary AC should be used with an AC adjustable voltage regulator box to get the lower 35 volts AC ,to get the 10.5amps full wave DC with Bridge unit after the lowered AC ?
 
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crutschow

Joined Mar 14, 2008
34,455
Likely the inverter transformer won't like half-wave rectification, as that causes a large DC component in the transformer current, which can saturate the core, give high primary currents.

Also, the power dissipated in the winding resistance is proportional to the RMS (square of the current) value so, even if the transformer wasn't a problem, you could only increase the half-wave current by the √2 for the same dissipation.
 

HasBeen

Joined Jul 28, 2023
29
User


A 500 Watt inverter has secondary windings of gauge magnet wire for expected use at 4 1/2 amps at 110v AC. Can this be used as half wave DC rectification at a different , lower, 35 volts pulsing DC, to use the higher value 10.5 amps output at electrical load resistance? The 2 electrical loads are 4.5A 100% on duty cycle and 6 Amps 34% duty cycle on. Maybe the secondary AC should be used with an AC adjustable voltage regulator box to get the lower 35 volts AC ,to get the 10.5amps full wave DC with Bridge unit after the lowered AC ?
It would seem that you have enough power available, but not in the proper voltage / current ratio to be able to use it without conversion. You could use a transformer to convert the AC voltage you do have to a lower AC voltage at higher current, assuming appropriate wire and core sizes are used. And, as crutshow stated, half-wave is not the way to go at the output for the reasons he cited.
 

Thread Starter

russwr

Joined Aug 29, 2017
51
I have removed the single rectification diode from the Power On Board Inverter box output, and replaced with AC to AC variable voltage reducer box, and have added full wave rectification . The 110v AC to be reduced to 35v DC for 6 amps output at only 34% duty cycle on time. The Inverter is high frequency type with tiny metal ferrite core with separate circuit to reduce to 60 cycles for modified sine wave end use. The 110v AC 500W has burst mode up to 800 watts. The secondary side was originally for about 4.5 amps at full 110v AC. This unit was used before many years ago by others at that 6-7 amp output as half wave DC. Does this sound better?
 
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