Power supply down-conversion, regulation and low battery detection system
US4868908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Oct 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2310/23
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A power supply down-conversion, regulation, and low battery detection system has application in an implantible defirillator but is also directly applicable to any battery powered implantible device. Battery voltage is down-converted by a high efficiency switched capacitor voltage divider to a suitable intermediate voltage. This voltage is then linearly regulated down to the desired output voltage. A second regulator, which takes current directly from the battery, supports the output voltage in the event that the load current cannot be supplied by the voltage downconverter. A low battery detect circuit shuts down high current circuitry in the system in the event that battery voltage drops to a level such that the regulated output voltage is endangered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.