DC charging circuit Calculating I, V, and Z?

[HMS-776]

I have a few questions on DC resonant charging circuits. The circuit only has a few practical applications, most noteably Radar and there is very little info online about it. If anyone could help, I would be very thankful...

1. What would be used to calculate max current in the circuit?

-Characteristic Impedance
-Circuit Series Resistance
-Characteristic Impedance and Circuit Series Resistance
-Neither?

2. What would be used to calculate current rise time in the circuit

-L/R and RC time constants
-di/dt=v/L
-Neither

3. If the LC circuit has a diode placed in it, and the circuit were given a 50% duty cycle pulse, would the inductor field collapse also be 50% duty cycle, causing the cap to be charged by a DC, instead of a pulsed DC source?

 

[berkeman]

I have a few questions on DC resonant charging circuits. The circuit only has a few practical applications, most noteably Radar and there is very little info online about it. If anyone could help, I would be very thankful...

1. What would be used to calculate max current in the circuit?

-Characteristic Impedance
-Circuit Series Resistance
-Characteristic Impedance and Circuit Series Resistance
-Neither?

2. What would be used to calculate current rise time in the circuit

-L/R and RC time constants
-di/dt=v/L
-Neither

3. If the LC circuit has a diode placed in it, and the circuit were given a 50% duty cycle pulse, would the inductor field collapse also be 50% duty cycle, causing the cap to be charged by a DC, instead of a pulsed DC source?

Do you have a link to the circuit, or can you post an example? "DC" and "resonant" don't usually go together...

 

[HMS-776]

As an example the circuit is usually connected to a AC transformer and a rectifier to turn it into straight dc. From there it is just a single inductor (in this case known as a charging choke) and a capacitor.

http://www.tpub.com/content/armymunitions/mm50058/mm500580084.htm"

 

[Carl Pugh]

The book
Principles of Radar
Third edition
By Reintjes & Coate
Has a description of this circuit with theory of operation.

Assuming that you are asking about resonant charging circuit only:
If I were doing the calculating, would do it as follows
1 Assume that have power supply with zero impedance.
This power supply is suddenly connected to an inductor (charging reactor) in series with a capacitor (total capacitance of pulse forming network)
It should then be easy to use a circuit analysis program to calculate the peak current on the first cycle.

2 Fr=1/(2*pi*(LC)^1/2)
Fr is resonant frequency
L and C as above
Rise time is the same as a circuit with this frequency.

3 The LC circcuit is always charged by a DC source.