Electricity: power supply or regulation systems – Output level responsive – Phase controlled switching using electronic tube or a three...
Patent
1979-05-23
1981-05-12
Shoop, William M.
Electricity: power supply or regulation systems
Output level responsive
Phase controlled switching using electronic tube or a three...
323320, 323903, 55105, B03C 368
Patent
active
042675022
ABSTRACT:
An improved precipitator voltage control system including an automatic voltage control (AVC) circuit, a firing circuit, an alarm circuit, a power-saving circuit, a remote set-point control circuit and a power supply, all of which are mounted on a single, readily interchangeable circuit board. The automatic voltage control circuit includes a highly responsive spark detection subcircuit which causes the transformer/rectifier voltage to be reduced to zero at the end of the half-cycle in which a spark occurs and then causes the voltage to remain at zero for a short period of time after which voltage is reapplied in a dual ramp manner causing it to rapidly reach a level below the precipitator arcing potential and then increase at a slower rate to the threshold of sparking. The firing circuit drives silicon-controlled rectifiers (SCRs) through optical couplers which provide several thousand volts of circuit isolation. The alarm circuit detects short-circuit and open-circuit conditions and causes automatic trip-out of the control circuit when such alarm conditions exist. The power-saving circuit allows operation of the precipitator to be monitored and the voltage thereof to be reduced during high resistivity conditions. The remote set-point control allows the drive current to be controlled from a remote source.
REFERENCES:
patent: 3577708 (1971-05-01), Drenning
patent: 3745749 (1973-07-01), Gelfand
patent: 3772853 (1973-11-01), Burge et al.
patent: 3873282 (1975-03-01), Finch
patent: 3877896 (1975-04-01), Muskovac
patent: 4152124 (1979-05-01), Davis
Hartman James T.
Reese Robert O.
Wieber Karl R.
Bohner Hal J.
Envirotech Corporation
Krebs Robert E.
Shoop William M.
Wong Peter S.
LandOfFree
Precipitator voltage control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Precipitator voltage control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precipitator voltage control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2049241