4.4 Recharging Controller and SCR Trigger Circuitry The recharge controller unit is used to determine the polarity and magnitude of both the voltage and current of the sector capacitor. This permits the proper triggering of SCR's after a drive coil firing to recharge the sector capacitor. The sequence of events before and during the recharge period is shown in Fig. 4.12. A block diagram showing how the proper SCR trigger signals are generated from sensing sector capacitor voltage and current is shown in Fig. 4.13. The circuit diagrams for the different circuits contained in Fig. 4.13 are shown in Figs. 4.14-4.17.
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