Title:
ISOLATION CIRCUIT, AUTOMOBILE DIAGNOSIS DEVICE, AND AUTOMOBILE DIAGNOSIS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/135814
Kind Code:
A1
Abstract:
An isolation circuit (100), an automobile diagnosis apparatus (300), and an automobile diagnosis system (500). The isolation circuit (100) comprises: a first switch circuit (10), electrically connected between an OBD connector (111) of an automobile to be diagnosed and a diagnostic device (200) of the automobile diagnosis apparatus (300), wherein the OBD connector (111) is further electrically connected to an automobile power supply (112) of the automobile; and a switch control circuit (20), electrically connected to the OBD connector (111) and the first switch circuit (10), wherein the switch control circuit (20) does not operate when it is detected that the OBD connector (111) outputs a power supply positive signal and when it is not detected that the OBD connector (111) outputs a power supply negative signal, such that the first switch circuit (10) operates in an off state to ensure that the diagnostic device (200) is not powered on, and the switch control circuit (20) outputs a control signal when it is detected that the OBD connector (111) outputs a power supply positive signal and when it is detected that the OBD connector (111) outputs a power supply negative signal, such that the first switch circuit (10) operates in an on state to ensure that the automobile power supply (112) supplies power to the diagnostic device (200). In the invention, poor grounding is avoided, and the reliability of the automobile diagnosis apparatus (300) is improved.
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Inventors:
CHEN HUAMING (CN)
PANG HAIBO (CN)
LU HONGHUA (CN)
PANG HAIBO (CN)
LU HONGHUA (CN)
Application Number:
PCT/CN2020/133795
Publication Date:
July 08, 2021
Filing Date:
December 04, 2020
Export Citation:
Assignee:
AUTEL INTELLIGENT TECH CORP LTD (CN)
International Classes:
H03K19/0175; G01R1/30; G01R15/14; H02H3/20
Foreign References:
| CN111064464A | 2020-04-24 | |||
| CN211457114U | 2020-09-08 | |||
| CN103022966A | 2013-04-03 | |||
| CN102591326A | 2012-07-18 | |||
| CN205186049U | 2016-04-27 | |||
| CN206422329U | 2017-08-18 | |||
| US20170026196A1 | 2017-01-26 |
Attorney, Agent or Firm:
AFD CHINA INTELLECTUAL PROPERTY LAW OFFICE (CN)
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