INTERLOCKED POWER SUPPLY TRANSFER CIRCUIT TO INHIBIT SECONDARY TRANSFER AFTER A PRIMARY TRANSFER

摘要

A transfer circuit to substitute a spare power supply for a failed one of a plurality of power supplies includes a logic circuit interlock arrangement to inhibit secondary transfers after the switching circuitry of the transfer circuitry has transferred the load from a first failed power supply to a spare power supply. The logic circuit interlock arrangement includes NAND gates and diode gates to complete an energy signal path to activate a transfer relay and apply inhibiting signals to disable subsequent energy signal paths and prevent secondary transfers.