Hallsensorsystem

Details

Veröffentlichungs-Nr.

EP4800413

Anmeldetag

28. Februar 2025

Veröffentlichung

2. September 2026

Rechtsraum

EP

IPC

G01R33/00, G01R33/07

Abstract

Hall sensor system (1) comprising at least one Hall cell (2a, 2b) and a signal processing circuit (3) comprising a chopper (5), a first channel (A), a second channel (B), a demodulator (6) and a ripple reduction circuit (7), each of the at least one Hall cells (2a, 2b) comprising first and second pairs of contacts defining first and second directions perpendicular to each other for applying bias voltages Vbias, Vtop or bias currents Ibias and sensing Hall voltages V1AC, V1DB, V2AC, V2DB. The chopper (5) is connected to the first and second pairs of contacts of the at least one Hall cells (2a, 2b) and configured to generate a four-phase spinning-current at each of the at least one Hall cells (2a, 2b). The first pair of contacts (c1D, c1B; c2A, c2C) of each of the at least one Hall cells (2a, 2b) is connected to an input (8A) of the first channel (A) for sensing Hall voltages V1DB, V2AC in the first direction during first and third phases of a four-phase spinning-current cycle and the second pair of contacts (c2D, c2B; c1A, c1C) of each of the at least one Hall cells (2a, 2b) is connected to an input (8B) of the second channel (B) for sensing Hall voltages V1AC, V2DB in the second direction during second and fourth phases of the four-phase spinning-current cycle. The demodulator (6) is configured to demodulate the signs of the Hall voltages sensed during the first to fourth phase to provide a demodulated Hall signal and to chronologically combine the demodulated Hall signal to provide an output signal. The ripple reduction circuit (7) comprises a first ripple reduction loop (13A) in the first channel (A) and a second ripple reduction loop (13B) in the second channel (B) configured to at least partially compensate a Hall cell offset based on a subtraction of the demodulated Hall signal of the second channel from the demodulated Hall signal of the first channel.

Anmelder

Firma

LEM International SA

Land

🇨🇭 Schweiz

Fachgebiete