Charging circuit with SCR's triggered by pedestal and cosine modified ramp unijunction circuit having means for current limiting by controlling pedestal level
US4031451A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1976 |
| Grant date | Jun 21, 1977 |
| Priority date | — |
| Expiry date | Feb 23, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00718
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery charging circuit gates charging current through a silicon controlled rectifier triggered by a pedestal and cosine modified ramp unijunction circuit. A battery potential sensing circuit limits the initial surge current delivered to a fully discharged battery and provides short circuit protection, a second battery potential sensing circuit limits the current delivered to a fully charged battery to a level required to maintain the float potential, and a charging current sensing circuit limits the average value of current delivered to the battery to a desired level during low battery impedance and/or high line conditions, all by controlling the pedestal level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.