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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Right now I manually control the flow of power to a unit using a variac. I dial it up; I dial it down. The output is rectified and smoothed for a DC output. What is my simplest solution for controlling power flow using electronics such that once I dial in a power setting with a potentiometer, for example, the circuit will slowly increase the power until my desired level is achieved? This would also allow me to cut the power off if needed.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Replace the rectifiers with SCR's. The firing angle will control the effective DC output voltage that the filters charge to for a given load.The firing angle controller can be a process variable, ie 0-5 VDC = 0- 100% output power, and you can use a setpoint junction to regulate it to a desired voltage/current or power level.
This is how DC motor controllers worked, very well, before VFD's came along.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Be careful when using SCR chopping supply as if you are driving an inductive load (such as a tesla coil) the power factor will be horrible, unless you are at full power.
A buck converter would be better in my mind as you can scale up and down the power and maintain a reasonable power factor no matter what level you have it set at.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
The buck converter looks easy enough to build. I need one that can handle 10kw (240vac x 40A). Would an IGBT of a sufficient rating work for the switch? How do I determine the proper inductance? Do I have to feed DC into it, or can I input a rectified signal?
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power control
