Current supplementation circuit for power supply
US4408153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1981 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Dec 28, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/59
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current supplementation circuit is designed to operate in conjunction with a two-terminal telephone line for supplying additional current to the output of a voltage regulator (42). A nonregulated voltage is received at first and second terminals (18, 20) with the nonregulated voltage comprising both DC and AC signals. An essentially regulated voltage is produced at a terminal (12) at the output of the voltage regulator (42). An essentially constant current is drawn from the first terminal (41) and provided to the second terminal (20) to provide an indication that the subscriber circuit is active. This constant current comprises first and second partial currents. The first partial current is passed through a control transistor (98) through a parasitic collector to the second terminal (14). The second partial current is passed through the control transistor (98) to the regulated voltage terminal (12) when the voltage at this terminal drops. The current supplementation circuit serves to bypass the voltage regulator (42) and supply additional current to the voltage regulated node when the voltage at that node drops below its intended level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.