US 11,656,252 B2
Method for measuring current and measurement apparatus
Sven Lill, Lauffen (DE); Harald Schöffler, Bretzfeld-Rappach (DE); and Daniel Simon, Ludwigsburg (DE)
Assigned to Dr. Ing. h.c. F. Porsche Aktiengesellschaft
Filed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Stuttgart (DE)
Filed on Nov. 4, 2021, as Appl. No. 17/518,720.
Claims priority of application No. 10 2020 129 127.2 (DE), filed on Nov. 5, 2020.
Prior Publication US 2022/0137105 A1, May 5, 2022
Int. Cl. G01R 19/22 (2006.01); G01R 19/25 (2006.01)
CPC G01R 19/22 (2013.01) [G01R 19/25 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for measuring a current (14) flowing through a conductor (12) using a measurement apparatus (20) having a current sensor (30) and at least one A/D converter (39), which current sensor (30) has at least two channels (CH1, CH2), via which channels (CH1, CH2) the current sensor (30) respectively provides a measurement signal (CH1_SIG, CH2_SIG) characterizing the current (14), which at least two channels (CH1, CH2) comprise a first channel (CH1) and a second channel (CH2), which second channel (CH2) is configured to measure a greater maximum current than the first channel (CH1),
said method comprising the following steps:
A1) processing the measurement signal (CH1_SIG) from the first channel (CH1) in a first signal processing apparatus (40A) and generating a first averaged measurement value (CH1_AVE),
A2) processing the measurement signal (CH2_SIG) from the second channel (CH2) in a second signal processing apparatus (40B) and generating a second averaged measurement value (CH2_AVE),
carrying-out (i) low-pass filtering (41A; 41B) of the measurement signal (CH1_SIG; CH2_SIG) in the first signal processing apparatus (40A) and in the second signal processing apparatus (40B), and (ii) A/D conversion (42A; 42B) for generating digital individual measurement values (CH1_VAL; CH2_VAL),
comparing each of the individual measurement values (CH1_VAL; CH2_VAL) with predefined values,
generating a quality criterion (CH1_OOR; CH2_OOR) based upon the comparison,
averaging the individual measurement values (CH1_VAL; CH2_VAL) in order to generate an averaged measurement value (CH1_AVE; CH2_AVE),
B) selecting, in a selection apparatus (46), on the basis of the respective quality criterion (CH1_OOR; CH2_OOR), whether the first averaged measurement value (CH2_AVE) or the second averaged measurement value (CH2_AVE) is used as a selected measurement value (SEL_VAL).