Capacitance impukse tester

[sundararaju]

Capacitance impulse tester

hi,
To charge a capacitor up to 6000 volt and discharge it. Two switching device I need .It may be thyristor or IGBT .The charging time is 15 sec and the source is DC volt.This procedure is known as impulse testing..
:thinker:

 

[FvM]

The charge switche can be probably saved by enabling and disabling the DC/DC converter.

Is the capacitance actually mF or is it µF?

 

[sundararaju]

capacitance is 20µF and charging time is 2µs and discharging time is 50µs .

 

[FvM]

charging time is 2µs and discharging time is 50µs

At least the 60 kA charging will be hard to achieve with a semiconductor switch. What's the purpose of fast charging? Which energy source is delivering the 360 MW?

 

[chuckey]

As the C19/R3 circuit will take 6000/2 = 2KA, that one big switch!. As the recycle time is 15 seconds, I would leave the charging resistor in circuit. Or if its power dissipation is a factor, power the 6KV PSU from a current regulated AC source. To get the 2µS rise time the switch/capacitor/R3 must be wired up to minimise series inductance, in fact I wonder if your capacitor by itself will be "fast" enough.
I would build the HV switch around the guts of a car starter solenoid, re-engineered to provide the HV insulation.
Frank