Portable electronic device and control method for the portable electronic device
US6343051B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reliable power supply control function in a portable electronic device which includes a limiter circuit, or includes the limiter circuit and a voltage step-up circuit, to reduce power consumption. It is detected whether or not a voltage generated by a power generator 40 or a voltage accumulated in a power supply device 48, 80 exceeds a preset limiter-ON voltage. When the voltage generated by the power generator 40 or the voltage accumulated in the power supply device 48, 80 has become not lower than the preset limiter-ON voltage, a voltage of electrical energy supplied to the power supply device is limited to a predetermined reference voltage set in advance. When it is determined based on a detection result of a status-of-power-generation detecting section 91 that power is not generated by the power generator 40, detecting operation of a limiter-ON-voltage detecting circuit 91A is prohibited. Power consumption required for operating the limiter-ON-voltage detecting circuit can be thus reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.