Patent ID: 9217652
Filing Date: 2015-12-22
Classification: G01D

Abstract:
1. A linear position detector, comprising: at least one magnetic-field sensor that generates sensor signals; a signal-processing unit configured to determine, during an initialization routine of the linear position detector, a minimum signal and a maximum signal of the at least one magnetic-field sensor over a linear full scale range of the linear position detector as a function of a magnetic-field source movable linearly along a movement axis relative to the linear position detector; and wherein the signal-processing unit has a signal input and an offset output, the offset output providing an offset signal, the at least one magnetic-field sensor is connected to a first switching device that is configured to generate a first phase signal and second phase signal from the sensor signals of the at least one magnetic-field sensor, the first and second phase signals are associated with a change in a direction of a Hall current through the at least one magnetic-field sensor, an adjustment circuit that is set up to generate a correction signal as a function of the minimum and maximum signals or first and second phase signals, the correction signal is inverted synchronously with the first and second phase signals, the signal-processing unit is configured to derive the offset signal from the sensor signals or first and second phase signals of the at least one magnetic-field sensor, a first combination means effectively couples, on an input side, the at least one magnetic-field sensor to the offset output and connects, on an output side, to the signal input, and a second combination means is connected to the offset output and the adjustment circuit on an input side of the second combination means, and is coupled on an output side to the first combination means such that the correction signal and the offset signal are superimposed on the sensor signals or first and second phase signals of the at least one magnetic-field sensor.