Title:
漏電検出回路および漏電遮断器
Document Type and Number:
Japanese Patent JP6708463
Kind Code:
B2
Abstract:
The present invention increases noise immunity of an electrical leakage detection circuit. A first comparator COMP1 generates a first comparison signal indicating a comparison result between a voltage corresponding to a detected signal from a zero-phase-sequence current transformer and a predetermined first threshold voltage VTH1. A judgment circuit outputs a judgment signal indicating if there is electrical leakage based on the first comparison signal and outputs a mask signal corresponding to the first comparison signal. A mask circuit generates a latch input signal based on the judgment signal and the mask signal. An output stage comprises a latch circuit which latches a state of the latch input signal when the latch input signal is asserted. The output stage generates a drive signal corresponding to the state of the latch circuit.
Inventors:
Shinichi Hashimoto
Application Number:
JP2016074130A
Publication Date:
June 10, 2020
Filing Date:
April 01, 2016
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02H3/347; H01H83/02
Domestic Patent References:
| JP10094161A | ||||
| JP4172915A | ||||
| JP2010176988A |
Attorney, Agent or Firm:
Sakaki Morishita
Masaki Taiki
Masaki Taiki