Marx Generator Circuit Properties?

[wil3]

Hello. I have several theoretical questions about Marx generator circuit operation. Note that I am in no way attempting to build one of these, as I would surely never compromise the integrity of this board by intending to build such a risky device.

I am curious about the recommended value of the resistors in the circuit. I understand that these resistors must have a high enough value so that they effectively block current during the discharge cycle, but simultaneously they must have low enough values that the capacitors can charge relatively quickly. Is there a "rule of thumb" for the optimum resistance given a certain capacitor value? I would like to minimize resistance so as to abet faster charging, but I am unsure of how low I can go without interfering with the discharge process.

Also, I am wondering whether the spark gaps may be substituted with N.O. relays in order to provide more control over the discharge timing. Would this setup save energy, or is it unrealistic because of the damage the discharge would do to the relay leads?

Thank you very much for any input.

 

[Bob S]

Hello. I have several theoretical questions about Marx generator circuit operation. Note that I am in no way attempting to build one of these, as I would surely never compromise the integrity of this board by intending to build such a risky device.

I am curious about the recommended value of the resistors in the circuit. I understand that these resistors must have a high enough value so that they effectively block current during the discharge cycle, but simultaneously they must have low enough values that the capacitors can charge relatively quickly. Is there a "rule of thumb" for the optimum resistance given a certain capacitor value? I would like to minimize resistance so as to abet faster charging, but I am unsure of how low I can go without interfering with the discharge process.

Also, I am wondering whether the spark gaps may be substituted with N.O. relays in order to provide more control over the discharge timing. Would this setup save energy, or is it unrealistic because of the damage the discharge would do to the relay leads?

Thank you very much for any input.

The resistors must be chosen based on charging RC time constant, and power (I-squared R) losses during rapid charging. If you can find NO relays that close in 100's of nanoseconds, and can hold off 1000's of volts and carry pulsed currents of 1000's of amps, use them.
Bob S

 

[oswaler]

Hello! These are great questions about the properties of a Marx generator circuit. I am happy to provide some insights based on my knowledge and experience with such circuits.

Firstly, the recommended value of resistors in the circuit depends on the specific design and purpose of the Marx generator. Generally, the resistors should have a value high enough to limit the current during the charging phase, but low enough to allow for a fast charging time. This balance is important to ensure efficient operation of the circuit. The exact resistance value will vary depending on the capacitor and voltage ratings, as well as the desired output voltage of the generator. A good rule of thumb is to select resistors with a value that is at least 10 times higher than the output voltage of the generator.

Regarding your question about using N.O. relays instead of spark gaps, it is possible to use relays for control over the discharge timing. However, it may not necessarily save energy as the relay leads may still experience damage from the high voltage discharge. Additionally, the switching speed of the relays may not be fast enough to effectively control the discharge timing. It is important to carefully consider the design and components used in a Marx generator circuit to ensure safe and efficient operation.

I hope this helps answer your questions. If you have any further inquiries, please don't hesitate to ask. Thank you.