AC Resonant charger with charge rate unrelated to primary power frequency
Abstract
An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input. A full-wave rectifier couples the secondary winding of the transformer to the load so that the load capacitance is always charged with the same polarity.
- Inventors:
-
- Torrance, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 864206
- Patent Number(s):
- 4329595
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS
- DOE Contract Number:
- EY-77-C-04-3745
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- resonant; charger; charge; rate; unrelated; primary; power; frequency; capacitive; load; pfn; provided; variable; repetition; multi-phase; source; control; unit; select; couple; phase; begin; half; cycle; optimum; range; increased; charging; voltage; step-up; transformer; full-wave; rectifier; selected; polarity; opposite; core; saturate; thyristors; correct; zero; crossover; response; sharp; pulse; generated; zero-crossover; detector; thyristor; automatically; associated; input; couples; secondary; winding; capacitance; charged; secondary winding; charging voltage; repetition rate; power source; control unit; transformer core; wave rectifier; step-up transformer; phase input; resonant charger; rate unrelated; charge rate; pulse generated; /307/363/
Citation Formats
Watson, Harold. AC Resonant charger with charge rate unrelated to primary power frequency. United States: N. p., 1982.
Web.
Watson, Harold. AC Resonant charger with charge rate unrelated to primary power frequency. United States.
Watson, Harold. Fri .
"AC Resonant charger with charge rate unrelated to primary power frequency". United States. https://www.osti.gov/servlets/purl/864206.
@article{osti_864206,
title = {AC Resonant charger with charge rate unrelated to primary power frequency},
author = {Watson, Harold},
abstractNote = {An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input. A full-wave rectifier couples the secondary winding of the transformer to the load so that the load capacitance is always charged with the same polarity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}