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Controlled Method Of Power Partitioning

IP.com Disclosure Number: IPCOM000049022D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Cronch, DD: AUTHOR [+2]

Abstract

Some electronic typewriters require partitioning of power supplies to remove unnecessary power to non-critical circuits during a standby mode of operation. This is typically accomplished by a mechanically actuated switch.

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Controlled Method Of Power Partitioning

Some electronic typewriters require partitioning of power supplies to remove unnecessary power to non-critical circuits during a standby mode of operation. This is typically accomplished by a mechanically actuated switch.

In order to prevent the removal of power during certain critical times of typewriter operation and thus create the potential for either machine damage or loss of proper electronic operation upon restarting, it is necessary to maintain power to the circuits during any time that the typewriter is in a busy or operational mode.

Referring to the drawing, if the standby switch is closed to place the typewriter in a standby condition, the electronics controlling the memory is placed in a keep-alive condition while non-critical circuits are shut off. The signal created by the closure of the standby switch after having been passed through a noise filter network and inverter becomes a high signal. The busy asterisk signal is generated by the typewriter during times when the typewriter is performing a function and is an active low signal.

When the typewriter is not busy, the signal goes high and the AND block 12 will then indicate that not only is the typewriter in a keep alive mode with regard to memory only but also the typewriter is at a point in its cycle where it may be placed into the keep-alive mode without causing machine malfunction. This signal is sent to the on/off logic 14 which, upon turning it off, eli...