Electronic postage meter having a regulated power supply system responsive to a voltage developed in a transformer primary winding circuit
US4578758A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1983 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Jun 23, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00346
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic postage meter includes a printer mechanism for printing postage and a microcomputer system for monitoring the printing of postage by the printing mechanism. A secure housing protects the printing mechanism and the microcomputer system. A source of operating potential is provided and is external to the secure housing. The electronic postage meter includes a system for energizing the microcomputer system. A transformer is provided and is mounted within the secure housing. The transformer secondary winding is operatively connected to the microcomputer system. A controlling circuit is coupled to the transformer primary winding and also to the external source of operating potential. The controlling circuit controls the voltage applied to the transformer primary winding and operates to switch the voltage applied to the transformer primary winding between a first condition where the transformer primary winding is energized and a second condition where the primary winding is not energized. The controlling circuit includes a circuit for varying the period of time the transformer primary winding is energized and the period of time the primary winding is deenergized. The period …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.