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1. (WO2018101052) DIRECT-CURRENT ELECTRICITY LEAKAGE DETECTION DEVICE AND ELECTRICITY LEAKAGE DETECTION DEVICE

Pub. No.:    WO/2018/101052    International Application No.:    PCT/JP2017/041190
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Nov 17 00:59:59 CET 2017
IPC: G01R 31/02
Applicants: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
パナソニックIPマネジメント株式会社
Inventors: IKUSHIMA, Tsuyoshi
生島 剛
FUKUO, Naoki
福尾 尚紀
NISHGAKI, Tomokazu
西垣 朋一
Title: DIRECT-CURRENT ELECTRICITY LEAKAGE DETECTION DEVICE AND ELECTRICITY LEAKAGE DETECTION DEVICE
Abstract:
The present invention addresses the problem of providing a direct-current electricity leakage detection device and an electricity leakage detection device, whereby the degree of freedom of selection of components constituting an excitation unit can be enhanced. An excitation unit (23) applies an excitation voltage, the voltage level of which changes in alternating fashion between a first high voltage value (VH1) higher than a reference voltage value (Vr) and a first low voltage value (VL1) lower than the reference voltage value (Vr), to an excitation coil (22). The excitation unit (23) has a comparison circuit (231) and a voltage switching circuit (232). The comparison circuit (231) outputs a comparison signal, the voltage level of which switches between a high level and a low level in accordance with the magnitude relation between a detection voltage (Vd) and a threshold voltage (Vth). The voltage switching circuit (232) switches the voltage level of the excitation voltage between the first high voltage value (VH1) and the first low voltage value (VL1) in accordance with the voltage level of the comparison signal.