-
公开(公告)号：US20190079117A1
公开(公告)日：2019-03-14
申请号：US15700867
申请日：2017-09-11
Applicant: Analog Devices Global Unlimited Company
Abstract: A measurement circuit is arranged to make several measurements, either at different times or in respect of different frequency components of currents measured by current sensors in respective phases of a multiphase supply system. The measurements are then used to correct for discrepancies in the transfer function of the sensors.
-
公开(公告)号：US09823275B2
公开(公告)日：2017-11-21
申请号：US14895868
申请日：2014-05-30
Applicant: Analog Devices Global
Inventor： Seyed Amir Ali Danesh , William Michael James Holland , John Stuart , Jonathan Ephraim David Hurwitz
IPC: G01R27/08 , G01R19/00 , G01R17/00 , G01R17/02 , G01R15/14 , G01R27/14 , G01R19/25 , G01R1/20 , G01R19/165
CPC classification number: G01R17/00 , G01R1/203 , G01R15/144 , G01R15/146 , G01R17/02 , G01R19/0084 , G01R19/0092 , G01R19/16542 , G01R19/2513 , G01R27/08 , G01R27/14
Abstract: The present invention relates to electrical measurement apparatus (10). The electrical measurement apparatus (10) comprises a measurement arrangement (20,24) configured to be disposed in relation to an electrical circuit (12,14,16,18) which bears an electrical signal, the measurement arrangement (20,24) being operative when so disposed to measure the electrical signal. The electrical measurement apparatus (10) further comprises a signal source (22) operative to apply a reference input signal to the measurement arrangement (20,24) whereby an output signal from the measurement arrangement comprises an electrical output signal corresponding to the electrical signal and a reference output signal corresponding to the reference input signal, the reference input signal having a substantially piecewise constant form which is repeated over each of plural cycles. The electrical measurement apparatus (10) yet further comprises processing apparatus (26) which is operative: to determine at least one cumulative representation, determination of the cumulative representation comprising summing plural received sections of the output signal, each of the plural received sections corresponding to at least a part and to a same part of the cycle of the reference input signal; and to determine at least one of: a transfer function for the measurement arrangement; a change in a transfer function for the measurement arrangement; and the electrical signal, in dependence on the at least one cumulative representation and the reference input signal.
-
公开(公告)号：US20170299636A1
公开(公告)日：2017-10-19
申请号：US15583257
申请日：2017-05-01
Applicant: Analog Devices Global
CPC classification number: G01R19/0092 , G01R17/02 , G01R35/005
Abstract: Current measurement apparatus comprises a measurement arrangement and a signal source. The measurement arrangement is configured to measure a current signal drawn by a load. The signal source is operative to apply a reference input signal to the measurement arrangement whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal. The signal source comprises a current multiplier which defines first and second current paths and is configured such that: the first path carries a multiplier input current signal; the second path carries a multiplier output current signal which determines the reference input signal and which corresponds to the multiplier input current signal multiplied by a multiplier value determined by the current multiplier; and the multiplier input current signal and the multiplier output current signal are carried on their respective paths in a same direction relative to a power supply voltage. Power drawn through the second path as divided by the multiplier value is less than the power drawn through the first path.
-
-
Search Results
13
records
(took 0.028 seconds)
