公开(公告)号：US20200064410A1

公开(公告)日：2020-02-27

申请号：US16673666

申请日：2019-11-04

Applicant: Huawei Technologies Co., Ltd.

Inventor： Wenping TONG ,  Kui ZHOU ,  Wencheng WANG

IPC: G01R31/389 ,  G01R31/385 ,  G01R31/36

Abstract: An insulation resistance detection circuit, detection method, and detection apparatus are provided. The circuit includes an alternating-current signal source, a resonant cavity, a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch. The alternating-current signal source is sequentially connected to the first resistor, the resonant cavity, the first switch, the second resistor, and the third resistor in series to form a loop. The first resistor is connected to a positive electrode of the alternating-current signal source, and the third resistor is connected to a negative electrode of the alternating-current signal source. One end of the second switch is connected to a negative electrode of a to-be-detected battery, the other end of the second switch is connected to the fourth resistor, and the other end of the fourth resistor is connected to ground.

公开(公告)号：US20180226814A1

公开(公告)日：2018-08-09

申请号：US15948612

申请日：2018-04-09

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yang LV ,  Wencheng WANG ,  Zhijie WANG

IPC: H02J7/00 ,  H01M10/44 ,  B60L11/18

CPC classification number: H02J7/0021 ,  B60L50/64 ,  H01M10/441 ,  H02J7/00 ,  H02J7/0016 ,  Y02T10/7005

Abstract: Embodiments of the present disclosure provide a voltage collection circuit and a circuit control method. The voltage collection circuit includes a battery monitoring chip, n switch units, and a controller. The battery monitoring chip is connected to a battery module including k battery cells, a battery cell CELL(i) is any one of the k battery cells. A switch unit Ji is connected in parallel to the battery cell CELL(i), a switch unit Js is connected in parallel to voltage collection channels Cs and C(s−1). The battery monitoring chip is configured to collect voltages of the k battery cells by using n+1 voltage collection channels. The controller is connected to the battery monitoring chip and control ends of the n switch units and configured to control working statuses of the n switch units according to the voltages collected by using the n+1 voltage collection channels.