US 12,488,939 B2
Universal AC/DC current sensor and isolator
Pranjal M. Gajare, Atlanta, GA (US); Shreyas Kulkarni, Atlanta, GA (US); Deepak M. Divan, Atlanta, GA (US); and Ruomu Hao, Atlanta, GA (US)
Assigned to Georgia Tech Research Corporation, Atlanta, GA (US)
Appl. No. 18/694,294
Filed by Georgia Tech Research Corporation, Atlanta, GA (US)
PCT Filed Sep. 23, 2022, PCT No. PCT/US2022/076937
§ 371(c)(1), (2) Date Mar. 21, 2024,
PCT Pub. No. WO2023/049845, PCT Pub. Date Mar. 30, 2023.
Claims priority of provisional application 63/247,543, filed on Sep. 23, 2021.
Prior Publication US 2025/0132089 A1, Apr. 24, 2025
Int. Cl. H01F 38/32 (2006.01); G01R 15/18 (2006.01)
CPC H01F 38/32 (2013.01) [G01R 15/181 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An active universal AC and DC current sensor configured for both AC and DC current measurement comprising:
a current input configured to receive an incoming AC current waveform and an incoming DC current waveform;
a first current path between the current input and a current output;
a second current path between the current input and the current output parallel to the first current path;
a Rogowski coil; and
a controller configured to:
provide the current sensor with a current waveform converter configuration in which the incoming AC current waveform is converted into a pulsed train and the incoming DC current waveform is converted into a switched current waveform;
receive a current sensor signal from the Rogowski coil; and
generate an output signal indicative of current flow through the Rogowski coil;
wherein the first current path comprises a first switch, such that when the first switch is closed, current can flow along the first current path between the current input and the current output, and when the first switch is opened, current is precluded from flowing along the first current path between the current input and the current output;
wherein the second current path comprises a second switch, such that when the second switch is closed, current can flow along the second current path between the current input and the current output, and when the second switch is opened, current is precluded from flowing along the second current path between the current input and the current output; and
wherein the Rogowski coil has an aperture, wherein at least one of the first current path or the second current path pass through the aperture.