Title:
PROTECTIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/057792
Kind Code:
A1
Abstract:
A protective circuit, comprising a micro circuit breaker (100), a surge protection device (300) and a trip control circuit (200), wherein the trip control circuit (200) comprises a zero-sequence transformer (210), a first comparison module (220), a delay module (230), an analog switch (240) and a trip driving module (250); the zero-sequence transformer (210) can sense a voltage signal which is proportional to an abnormal current, the voltage signal being compared with a first reference level at the first comparison module, so as to filter out the interference of an abnormal current with a relatively low amplitude; the delay module (230) filters out the interference of a temporary surge; for a temporary over-voltage with a relatively long duration and an abnormal current generated by means of electric leakage, the delay module (230) controls the analog switch (240) to be closed, so as to transmit a voltage signal; and the trip driving module (250) drives, according to the voltage signal, a tripper (110) to act, so as to trip the micro circuit breaker (100).
Inventors:
TANG RONGDAO (CN)
Application Number:
PCT/CN2021/118266
Publication Date:
March 24, 2022
Filing Date:
September 14, 2021
Export Citation:
Assignee:
ZTE CORP (CN)
International Classes:
H02H3/02; H02H3/32; H02H9/04
Foreign References:
| CN111049101A | 2020-04-21 | |||
| CN108599108A | 2018-09-28 | |||
| CN102354965A | 2012-02-15 | |||
| CN106298366A | 2017-01-04 | |||
| CN111130208A | 2020-05-08 |
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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