How to design pulsed power capacitors?

Basic design information:

1. Pulse capacitor energy unit KJ: energy Q= (1/2) CU2, energy density: Q/V

(V represents capacitor volume, tank volume)

2. Pulse capacitor allows maximum reverse voltage (5%~80%); Design according to clients’ needs.

3. Pulse capacitor rated working current (pulse current), KA;

4. Pulse capacitor equivalent series resistance requirements;

5. Impulse capacitor stray inductance requirements;

6. Pulse capacitor voltage: 1.05~2Un according to users’ needs;

7. Withstand voltage requirements between shell and terminals: no test for plastic shell

8. Pulse capacitor operating frequency?

9. Pulse capacitor life expentancy level;

No	Test item	Technical requirement	Test condition
1	Visual inspection	no scratch, clear mark lable	Visual
2	Dimension inspection	Conform to the specification sheet	measuring tools
3	Test voltage between terminals	1.5Un, No permanent breakdown or flashover	withstanding voltage tester，6000VDC，10s，20℃±10℃
4	Withstand voltage between electrode and shell	No breakdown or flashover	withstanding voltage tester 4000VAC，60s，20℃±10℃
5	Capacitance	0~5%	LCR meter，100Hz，20℃±10℃
6	Dissipation factortanδ	≤0.0004	100Hz，20℃±10℃
7	Insulation resistanceRi*CN	≥15000 MΩ*μF	100VDC,60s,20℃±10℃
8	Equivalent series resistanceESR	≤3mΩ	LCR meter，1kHz
9	ESL	≤20nH	Short-circuit discharge method (Charging capacitor 400VDC, short-circuit discharge with the shortest possible wire, oscilloscope to capture the current waveform, calculate the inductance value - conductor inductance)