Capacitor charging apparatus and electronic flash and apparatus containing same
US6516153B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Nov 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A capacitor charging apparatus includes a DC/DC converter for stepping up the voltage of a battery and charging the capacitor; a detection circuit that determines whether a primary current of the DC/DC converter reaches a predetermined limit current; a control circuit that controls the DC/DC converter according to a detection signal received from the detection circuit; and a battery-information detection circuit that detects battery information of the battery. The control circuit performs a predetermined calculation using the battery information received from the battery-information detection circuit to determine the predetermined limit current and to vary the primary current of the DC/DC converter so as to control the DC/DC converter each time the capacitor is charged by the DC/DC converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.