Method and circuit arrangement for measurement of the current through an inductive load
US8471569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2010 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Jun 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a method and a circuit arrangement for measurement of the current through an inductive load L wherein the current is fed into the inductive load L with the aid of a full-bridge circuit. By way of example, full-bridge circuits such as these are used to feed a current in a pulse-width-modulated form into a winding of a direct-current, stepping or plunger coil motor. A respective measurement device (Ra, Rb) is provided for each half-bridge. In this case, a respective measurement device (Ra, Rb) is arranged between in each case one series circuit of switching elements and ground (VSS) or the supply voltage (VDD), respectively, at which a respective voltage is tapped off, which is a measure of the current through the respective measurement device. The device for measurement of the current has at least one switching device (S), by means of which one of the two inputs (e1, e2) of differential amplifier (D) can be selectively connected to ground (VSS) or to the supply voltage (VDD), or to one of the two measurement devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.