Storage of binary data during power failure - using magnetic cores to preserve data on supply failure and restore it on recovery automatically

摘要

The system is presented is for use in data networks which preserves binary data when a supply voltage failure occurs. The operation depends on core storage. An example is one in which the contents of an eight bit binary register are stored. A voltage discriminator detects a fall in the supply voltage and primes a current source feeding a row of eight transistor emitters. Each corresponding collector supplies a "write" winding on a magnetic core, and each base is driven from the binary register. When a supply voltage collapse occurs, therefore, the cores corresponding to "one" bits in the register are "set" and the others left "unset". On the restoration of the supply voltage, a current source is activated which supplies read-out drive to all the cores and those containing "ones" produce an output in a further winding which is amplified and used to reset the binary register. An appropriate clock pulse is also produced.