Voltage detection circuit, overcurrent detection circuit, charging current control system, and voltage detection method
US7459887B2 · kind B2 · utility
4Cited by
7References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2005 |
| Grant date | Dec 2, 2008 |
| Priority date | — |
| Expiry date | Dec 29, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0092
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A voltage detection circuit detects an input voltage in first and second periods to average by using a switch circuit and a sampling circuit. At this time, the input voltage of the second period is added to the input voltage of the first period so that a polarity of variations is opposite, the variations being in relative errors of a plurality of resistors for dividing the input voltage, in input offset voltages of a voltage amplifier for amplifying an inputted minute voltage, and in input offset voltages of a comparator for comparing an amplified voltage value with a certain level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.