Fluke pmn instruction manual   ,    

 
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For clarification and further technical assistance specific to your application, please contact Lambda EMI.

 
 



The ratings of these supplies are as follows: 500A - 500 J/s, 102A - 1000 J/s, 152A - 1500J/s, 202A-2000J/s average charge rate. Although the measure of Joules/sec equates to Watts, Stored Energy per unit time is more convenient when working with energy storage capacitors. The peak charge rate determines the capacitor charge time. The average charge rate determines the total power delivered from the power supply. It is possible to charge a capacitor at 1650 J/sec, but to discharge it at a low rep. rate producing an average of 100 J/sec. The following formulas can be used to determine the average and peak charge rate.

V O L T A G E
	T c	T I M E
		T p
	1 CV 2
Peak Charge Rate =	2	C - OUTPUT LOAD CAPACITOR
	TC

V - PROGRAMMED OUTPUT VOLTAGE

	1	CV 2
Average Charge Rate =	2		TC AND TP ARE SHOWN IN FIGURE
		Tp

Figure 5.1 Output Voltage Waveform

  


When the capacitor or PFN is discharged, a high peak current may flow out of the power supply as a result of voltage reversal. This occurs in a system which is underdamped in order to clear the high voltage switch after each pulse. The average value of this peak current added to the normal output current may exceed the rating of the HV diodes in the power supply. This current can be measured with a current transformer as shown in Figure 5.2.

83-493-001 Revision G

5 - 1 Applications