Table 4.5 Recharge system circuit voltages The amount of energy delivered to the sector capacitor and energy lost by the recharge capacitor is given in Table 4.6. The recharge system efficiency is defined as the ratio of SCB energy gain to RCB energy lost. Test 5 showed a 98% efficiency which is not consistant with the other values. A one volt difference in the recharge capacitor voltage would reduce the efficiency to 73% which is more in line with the other values. Similar remarks can be made for tests no. 7 and 8 since tests 5-8 had a - 1 volt measurement accuracy for the recharge capacitor voltage. Therefore the average recharge system efficiency is 72%. Other parameters of the recharge system are given in Table 4.7. The recharge period (average) is which is reduced from the value in the early test circuit for the recharge system. The goal was to have a period of but stray inductance in the electrolytic capacitors prevented this from being obtained. Allowing for about for reverse recovery on the SCR's and a delay before SCR turn on brings the total recharge time to . This period is a dead spot in the drive current waveform which reduces the duty cycle of that phase. The peak current and average i^2t values (when scaled up) seem reasonable for the SCR's.
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