Measuring arrangement for measuring an effective value of an AC voltage in a handheld power tool
US9720016B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2013 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Jan 28, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/221
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand-held power tool is disclosed with a measuring system for determining an effective value of an alternating voltage which is fed via an external conductor with respect to a neutral conductor. A regulated direct voltage source has a power supply potential which is referenced to the neutral conductor. There is a first resistance value from the power supply potential to a tap and a second resistance value from the tap to a ground. A voltmeter has a measurement range and its measurement input is connected to the tap. A measurement line connects the tap to the external conductor. The first resistance value is lower than the second resistance value such that the mean voltage value on the tap is equal to the mean of the measurement range for one period of the alternating voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.