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Figure 5.3 HV Bias Measurements

 




P

IL = V L P F
EFF

IL = Line current

P = Average output power VL = Line voltage

PF = Power factor (.65 min) EFF = 0.85

Ex: A 152A operating from 115V - 10% and delivering 1000W average.

1000

IL = (115)(.65)(0.85)
0.9 = 17.5A

When charging very large capacitor banks requiring many seconds or minutes to reach end-of-charge, the power supply will display a load fault and go into a 50% duty cycle protection mode. If this feature is defeated and the power supply is allowed to charge for an extended period, the peak output power, not the average power, must be used to determine line current. (See Section 5.7).

   


 
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The 500A/102A/152A/202A supplies can be used as a constant voltage supply by the addition of an external filter capacitor. The value of this capacitor will determine the ripple voltage on the DC output.

The value of this ripple voltage can be expressed as :

1.4(Po max)
V PK−PK = (Vo)(Co)(Fs)

Where : Po max = Maximum outut power in watts

Vo = Output voltage in volts

Co = Total output capacitance in microfarads

Fs = Lowest switching frequency (40KHz)

When operating as a DC supply care must be taken not to draw more than the J/sec rating of the unit.

Also, if the filter capacitor is inadvertently shorted, it may ring which can damage the supply (Section 5.2).

83-493-001 Revision G

5 - 4 Applications