公开(公告)号：US20220120796A1

公开(公告)日：2022-04-21

申请号：US17566715

申请日：2021-12-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yanhui Fu ,  Le Chu

IPC: G01R27/14

Abstract: The present application discloses a circuit and a method for detecting insulation resistance. The circuit includes: a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module, a first switch module, a fifth voltage dividing module, a second switch module, a third switch module, and a detecting module, where the first voltage dividing module comprises a first voltage dividing unit and a second voltage dividing unit, and the third voltage dividing module comprises a third voltage dividing unit and a fourth voltage dividing unit. According to the embodiments of the present application, errors caused by fluctuations in the pull-up of the reference power supply can be avoided, and the accuracy of the circuit for detecting insulation resistance can be effectively improved.

公开(公告)号：US11048316B2

公开(公告)日：2021-06-29

申请号：US16357552

申请日：2019-03-19

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuqun Zeng ,  Kai Wu ,  Le Chu ,  Jianwei Zhuo ,  Qiandeng Li

IPC: G06F1/3225 ,  G06F1/26 ,  G06F1/30 ,  G06F1/3234

Abstract: The present application provides a power-down detection circuit and a control method. A low-voltage side power supply is connected to provide an output voltage of the low-voltage side power supply to a power-down detection sub-circuit and provide a standard supply voltage to the power-down detection sub-circuit, a controller and a memory via a voltage conversion circuit. The power-down detection sub-circuit is configured to obtain the output voltage of the low-voltage side power supply, and determine, according to the output voltage of the low-voltage side power supply, whether a power-down event occurs in the low-voltage side power supply. If it is determined that a power-down event occurs, a power-down signal is sent to the controller. The controller receives the power-down signal, and controls the memory to record current information of a high voltage bus sensed by a high-voltage side current sensor.

公开(公告)号：US11656672B2

公开(公告)日：2023-05-23

申请号：US17315260

申请日：2021-05-07

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuqun Zeng ,  Kai Wu ,  Le Chu ,  Jianwei Zhuo ,  Qiandeng Li

IPC: G06F1/26 ,  G06F1/30 ,  G06F1/32 ,  G06F1/3225 ,  G06F1/3234

CPC classification number: G06F1/3225 ,  G06F1/263 ,  G06F1/30 ,  G06F1/3275

Abstract: The present application provides a method for controlling a power-down detection circuit, a controller and a computer readable storage medium. The method includes: receiving, by a controller of a power-down detection circuit, a power-down signal, wherein the power-down signal is sent from a power-down detection sub-circuit of the power-down detection circuit when it is determined by the power-down detection sub-circuit that an output voltage of a low-voltage side power supply of the power-down detection circuit is smaller than a threshold, and wherein the power-down detection sub-circuit and the controller are powered by the low-voltage side power supply; controlling, by the controller, a memory of the power-down detection circuit to record fault information, wherein the fault information comprises current information of a high voltage bus sensed by a high-voltage side current sensor of the power-down detection circuit; and performing, by the controller, a fault diagnosis based on the fault information.

公开(公告)号：US11258278B2

公开(公告)日：2022-02-22

申请号：US16799729

申请日：2020-02-24

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jianwei Zhuo ,  Le Chu ,  Jirong Huo ,  Yanhui Fu ,  Qiandeng Li

IPC: H02J7/00 ,  G01R19/165

Abstract: The present disclosure discloses a detection circuit and method. The detection circuit comprises: a controller, a battery pack, a main positive switch module, a main negative switch module and at least one detection loop. The controller collects voltages of a positive electrode and a negative electrode of the battery pack and a voltage between external sides of the main positive switch module and the main negative switch module when turning on the main positive or negative switch module and after turning on any detection loop, and obtains resistance values of insulation resistors of the external sides according to resistance values of insulation resistors of internal sides of the main positive and negative switch module, as well as the voltages of the positive electrode and the negative electrode and the voltage between the external sides of the main positive switch module and the main negative switch module, which are collected twice.

公开(公告)号：US11085960B2

公开(公告)日：2021-08-10

申请号：US16364390

申请日：2019-03-26

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Le Chu ,  Qiandeng Li ,  Yanhui Fu ,  Qidong Lou

IPC: G01R31/50 ,  G01R31/14 ,  G01R31/389 ,  G01R31/3835 ,  G01R27/14

Abstract: An insulation detection method includes: a first and second equivalent resistances are calculated; the less one of the first and second equivalent resistances is taken as a first insulation resistance, which is an insulation resistance of the high voltage circuit on the side where the battery pack locates relative to the reference potential terminal; when the first insulation resistance is normal, the switch unit is closed, and a second insulation resistance is calculated according to the first and second equivalent resistances, voltages of a first and second sampling point when the switch unit is closed; the second insulation resistance is an insulation resistance of the high voltage circuit on the side where the load locates relative to the reference potential terminal; the insulation state of the high voltage circuit on the side where the load locates is determined according to the second insulation resistance.

公开(公告)号：US12025666B2

公开(公告)日：2024-07-02

申请号：US17585326

申请日：2022-01-26

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yanhui Fu ,  Le Chu ,  Changjian Liu

IPC: G01R31/327 ,  G01R31/00 ,  G01R31/52 ,  G05B23/02

CPC classification number: G01R31/3278 ,  G01R31/006 ,  G01R31/52 ,  G05B23/0213

Abstract: This application relates to the technical field of electronics, and discloses a detection circuit and a detection method of an electrical control device, and an electric vehicle. In some embodiments of this application, the detection circuit includes a drive circuit configured to detect an electrical control device. The drive circuit includes a drive power module and a low-side switch unit. The detection circuit includes: a first detection module, a second detection module, and a control module. The control module is configured to obtain an electrical signal at a third end of the first detection module, and/or an electrical signal at a second end of the second detection module; and determine, based on the electrical signal at the third end of the first detection module, and/or the electrical signal at the second end of the second detection module, whether the drive circuit of the electrical control device is faulty.

公开(公告)号：US11996833B2

公开(公告)日：2024-05-28

申请号：US17732569

申请日：2022-04-29

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jirong Huo ,  Yanhui Fu ,  Changjian Liu ,  Le Chu

IPC: H03K17/28 ,  B60L58/10

CPC classification number: H03K17/28 ,  B60L58/10 ,  H03K2217/0063

Abstract: Embodiments of this application relate to the field of electricity, and disclose a drive circuit. In some embodiments of this application, the drive circuit includes a high-side driver module and a delay module, the delay module is configured to output a delay signal of preset duration to the high-side driver module in a case that a control module is being reset; and the high-side driver module is configured to: according to the delay signal of preset duration, remain in a first state within the preset duration, the first state being the same as a second state; where the second state is a working state of the high-side driver module before the control module is reset, and the second state includes being on or off.

公开(公告)号：US20220270838A1

公开(公告)日：2022-08-25

申请号：US17740714

申请日：2022-05-10

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Jirong Huo ,  Yanhui Fu ,  Le Chu ,  Changjian Liu

IPC: H01H47/18 ,  H03K17/284

Abstract: Embodiments of this application relate to the field of electricity, and disclose a drive circuit. In some embodiments of this application, the drive circuit includes a low-side driver module and a delay module, the delay module is configured to output a delay signal of preset duration to the low-side driver module in a case that a control module is being reset; and the low-side driver module is configured to: according to on the delay signal of preset duration, maintain a first state within the preset duration, the first state being the same as a second state; where the second state is a working state of the low-side driver module before the control module is reset, and the second state includes being on or off. The embodiments can help avoid safety hazards caused by unexpected disconnection of a drive signal of the control module.

公开(公告)号：US11360136B2

公开(公告)日：2022-06-14

申请号：US17204260

申请日：2021-03-17

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuqun Zeng ,  Kai Wu ,  Jirong Huo ,  Le Chu ,  Yanhui Fu ,  Qiandeng Li

IPC: G01R31/00 ,  H02H1/00 ,  H02H3/16

Abstract: Disclosed are a load state detection circuit and method. A microcontroller is connected to a switch unit which is connected between a detecting power supply and a load to be tested. A voltage sampling point is formed at either terminal of the load to be tested, and the voltage sampling circuit is connected between the voltage sampling point and the microcontroller. The voltage sampling circuit is configured to sample a voltage at the voltage sampling point. The microcontroller is configured to connect the load to be tested and the detecting power supply by controlling the switch unit, and determine whether a fault exists in the load to be tested according to a received voltage at the voltage sampling point sampled by the voltage sampling circuit, before connecting the load to be tested with the drive power supply.

公开(公告)号：US11733279B2

公开(公告)日：2023-08-22

申请号：US17566715

申请日：2021-12-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yanhui Fu ,  Le Chu

IPC: G01R27/14

CPC classification number: G01R27/14

Abstract: The present application discloses a circuit and a method for detecting insulation resistance. The circuit includes: a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module, a first switch module, a fifth voltage dividing module, a second switch module, a third switch module, and a detecting module, where the first voltage dividing module comprises a first voltage dividing unit and a second voltage dividing unit, and the third voltage dividing module comprises a third voltage dividing unit and a fourth voltage dividing unit. According to the embodiments of the present application, errors caused by fluctuations in the pull-up of the reference power supply can be avoided, and the accuracy of the circuit for detecting insulation resistance can be effectively improved.