US 11,899,073 B2
High-precision impedance measurement device
Hyung Bin Son, Seoul (KR); Young Jae Lee, Daejeon (KR); Gyeong Rin Choi, Gwangju (KR); and Young Jin Hong, Daejeon (KR)
Assigned to Mintech Co., LTD, Daejeon (KR)
Appl. No. 17/435,027
Filed by MINTECH CO., LTD, Daejeon (KR)
PCT Filed Sep. 22, 2020, PCT No. PCT/KR2020/012767
§ 371(c)(1), (2) Date Aug. 30, 2021,
PCT Pub. No. WO2021/075744, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 10-2019-0126959 (KR), filed on Oct. 14, 2019.
Prior Publication US 2022/0137144 A1, May 5, 2022
Int. Cl. G01R 31/389 (2019.01); H03F 3/04 (2006.01)
CPC G01R 31/389 (2019.01) [H03F 3/04 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An impedance measurement device comprising:
an electrochemical energy device;
an amplifier connected to each connection terminal of the electrochemical energy device and configured to remove a DC signal of a signal introduced through a wiring, allow an AC signal of the signal to pass therethrough, and amplify and provide the AC signal;
a main board configured to receive the AC signal from the amplifier and measure an impedance of the AC signal, and
wherein the amplifier comprises,
a DC blocking portion configured to remove a DC signal of a signal of a power applied from the electrochemical energy device and allow an AC signal of the signal to pass therethrough;
a first amplifier configured to be disposed close to the connection terminal of the electrochemical energy device to not amplify a common mode noise introduced through the wiring and to amplify the AC signal; and
a second amplifier configured to be isolated from the first amplifier and to provide the signal amplified by the first amplifier to the main board.