Batteryless data logger with backup status indication and method therefor
US10481660B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Apr 25, 2019 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Apr 25, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/345
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Data storage device has a super-capacitor, a control unit with multiple operational states, non-volatile memory, and a bus connected to a computing device with a separate power source. The control unit state is set by the power level of the computing device and the super-capacitor. In a backup state, the control unit stores backup data from the computing device in the non-volatile memory using power from the super-capacitor. In an inactive state, the control unit does not receive power from the super-capacitor. The control unit is set to the backup state when the device power level is less than a first threshold and the super-capacitor voltage level is greater than a second threshold. The control unit is set to the inactive state when the super-capacitor voltage level decreases below a third threshold that is less than the second threshold by more than the dielectric absorption voltage gain of the super-capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.