On 16:59, Paul Nicholson wrote:
The idea in my analysis was to combine a CW excitation for a number of cycles with the transient generated by the excitation, or to exploit the "zero-state response" of the network. It is then possible to obtain the same behavior of a Tesla coil in the DRSSTC version, with all the energy concentrating at the secondary capacitance at the end of the excitation, and the same behavior of the magnifier in the "triple resonance" version, with all the energy concentrating at the third coil capacitance at the end of the excitation. For the DRSSTC this works very well, with excitation at relatively low voltage producing very high output voltage and perfect synchronism between voltage and current at the driver. For the "TRSSTC" version the behavior is not so good, with the voltage gain being smaller and the input current becoming out of phase with the input current. Note that in all these systems the apparently correct idea of driving at one of the resonances of the system without interruption accumulates energy everywhere, not only in the output capacitance, resulting in great inefficiency. A spark discharging the output does not discharge all the stored energy, and the input current keeps growing. The excitation must then be periodically interrupted to stop the growing of the input current, The optimum design in this situation is then the one exploiting the zero state response, with waveforms similar to the ones of a capacitor-discharge system. Systems using forced synchronism between the input current and the input voltage or expecting to continuously drive streamers are also at least close to optimal if designed in that way. It's also possible to design a "quadruple resonance" system, and systems of higher order, but they would be probably unpractical. Driving at more than one frequency is apparently possible, with an irregular input voltage or with regular input voltages at different points.In a CW coil, the excitation is only at a fundamental mode of the resonator so there is no overtone behaviour to worry about or exploit. In this case it may still be desirable to split the resonator, but for other reasons, such as voltage breakdown capability, ease of tuning and coupling, portability, and so on. One might consider multi-frequency CW excitation in order to produce a CW magnifier but I don't think this idea has been explored. --
Antonio Carlos M. de Queiroz _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla