Power supply control device
US8384240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2010 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Aug 31, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/701
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When a highly accurate clock is received by a GPS radio wave from a GPS antenna, the highly accurate clock is always generated by locking a phase locked loop (PLL) circuit within a hold-over section of a clock control section in a power supply control unit. When the GPS radio wave cannot be received normally, the highly accurate clock depending on the GPS radio wave is set to a self-running condition not depending on a self-oscillation clock from an internal clock generating section and a time management section automatically corrects the present time data obtained when the standard radio wave is received from a radio wave antenna based on the highly accurate clock. A primary voltage generating section continuously generates the highly accurate clock even when an ignition switch is turned OFF by avoiding voltage variation in battery voltages while the ignition switch is turned ON. Accordingly, the power supply control device can sustain highly accurate time correction and a clock function under any environmental condition and can also control and execution of various functions based on accurate time management.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.