A resonant series counterpulse technique for high current opening switches
- Delft Univ. of Technology (Netherlands). Lab. for Power Electronics and Electrical Machines
- TNO PML-Pulse Physics Lab., Delft (Netherlands)
A counterpulse technique for the controlled interruption of very high currents in inductive storage pulsed power systems is described and analyzed, and some simulation results of its performance are presented. The accompanying circuit comprises a pre-charged capacitor bank, connected in series with the inductive load, which has to be provided with a current pulse. Upon actuation, a resonant counterpulse current is created in the opening switch, connected in parallel with the current source and the load. In this way, the opening switch is opened at low current. A separate closing switch prevents closing of the opening switch at high voltage. Operation of the opening switch, often a mechanical switch, at low current and low voltage prevents arc erosion of the contacts. The advantage of this circuit compared to other counterpulse circuits is that the capacitor bank does not experience a voltage reversal. Electrolytic capacitors, which have a high energy density, are applied. The remaining energy of the capacitor bank after opening the opening switch, is transferred to the load. The required initial voltage of the capacitor bank is only a few hundred volts, whereas it may be above a kilovolt in other circuits. Another advantage of the method described here is that the load does not experience a pre-current, causing unwanted preheating of the load, before the resonant current is activated. At the moment, work is being performed at the Pulse Physics Laboratory to develop the resonant series counterpulse circuit for use with rail accelerators, which must be supplied with current pulses in the millisecond range up to the mega-ampere level.
- OSTI ID:
- 32046
- Report Number(s):
- CONF-940481-; ISSN 0018-9464; TRN: IM9517%%341
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 31, Issue 1Pt1; Conference: 7. symposium on electromagnetic launch technology, San Diego, CA (United States), 20-24 Apr 1994; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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