| 摘要 |
PURPOSE:To realize stabilized compensation without sacrificing high frequency compensation rate by varying the load current detection resistor depending on the number of active filters failed during parallel redundancy operation. CONSTITUTION:When two active filters(AF) 31, 32 connected in parallel are operating normally, switches 73, 74 are closed to split the current equally between resistors 71, 72. Consequently, a load current detection voltage VL12 appears between terminals A12, B12 and a load current detection voltage VL22 appears between terminals A22, B22. Upon failure of the AF31, the switch 73 is opened to interrupt current through the resistor 71. Consequently, the load current detection voltage VL22 appearing between the terminals A22, B22 is doubled as compared with the case when two AFs are operating normally. In other words, when (m) units among (n) units of AF fail during parallel operation, the load current detection resistance is increased by a factor of [n/n-m)]. |
