US 12,248,014 B2
Insulation monitoring device using triangular wave and method for controlling thereof
Sun Woo Kim, Hwaseong-si (KR); and Jong-Phil Hong, Sejong-si (KR)
Assigned to DONGWOO ELECTRIC CORP. & CHUNGBUK NATIONAL, Pyeongtaek (KR); and UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, Cheongju-si (KR)
Appl. No. 18/018,100
Filed by DONGWOO ELECTRIC CORP., Pyeongtaek-si (KR); and CHUNGBUK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, Cheongju-si (KR)
PCT Filed Sep. 7, 2020, PCT No. PCT/KR2020/012047
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/025338, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 10-2020-0093990 (KR), filed on Jul. 28, 2020.
Prior Publication US 2023/0280389 A1, Sep. 7, 2023
Int. Cl. G01R 31/14 (2006.01); G01R 13/02 (2006.01); G01R 19/00 (2006.01); G01R 19/252 (2006.01); G01R 27/16 (2006.01)
CPC G01R 31/14 (2013.01) [G01R 13/02 (2013.01); G01R 19/0023 (2013.01); G01R 19/0053 (2013.01); G01R 19/252 (2013.01); G01R 27/16 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An insulation monitoring device comprising:
an impedance formed between a power line and a ground of a system, the impedance comprising:
a signal generation circuit for applying a triangular wave signal to the power line through a signal measurement circuit;
the signal measurement circuit for measuring a voltage difference across a detection resistor of the signal measurement circuit or a current flowing through the detection resistor when the triangular wave signal is applied to the impedance;
a control circuit configured to obtain an impedance value of the impedance based on at least one of the voltage difference and the current and to monitor the impedance value
wherein the impedance includes an insulation resistor and a capacitor, and
wherein the control circuit is further configured to:
obtain a voltage difference across both ends of the insulation resistor based on a voltage difference across both ends of the detection resistor;
obtain the insulation resistor value by obtaining the ratio of the difference in voltage across the insulation resistor between the first time point t1 and the second time point t2 and the difference in current flowing through the detection resistor;
obtain the capacitor value based on the insulation resistor value at the second time point t2.