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Isolated sampling circuit for motor and power battery controller

A power battery, isolation sampling technology, applied in the direction of voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems of poor sensitivity of fault protection, low signal sampling accuracy, low motor control accuracy, etc., to achieve sensitive protection, The effect of suppressing noise interference ability, convenient frequency and amplitude adjustment

Active Publication Date: 2018-11-30
DONGFENG MOTOR CORP HUBEI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage is that the cost is high, and the disadvantage is that the signal sampling accuracy is not high and the transmission rate is slow, so the control accuracy of the motor is low and the fault protection sensitivity is poor

Method used

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  • Isolated sampling circuit for motor and power battery controller
  • Isolated sampling circuit for motor and power battery controller
  • Isolated sampling circuit for motor and power battery controller

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0023] like figure 1 As shown, the present invention includes a voltage sampling circuit 1, a temperature sampling circuit 2, an isolated power supply circuit 3, a non-isolated power supply circuit 4, an isolated overvoltage protection circuit 5, a first isolated pulse width modulation circuit 6, and a second isolated pulse width modulation circuit. Circuit 7, triangular wave generating circuit 8 and microcontroller circui...

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Abstract

The invention relates to the technical field of a new-energy electromobile and especially relates to a motor and power battery controller isolated sampling circuit. The isolated sampling circuit comprises a sampling circuit, an isolated power circuit, a non-isolated power circuit, a single-chip microcomputer circuit, an isolated pulse width modulation circuit and a triangular wave generation circuit. The isolated pulse width modulation circuit comprises a digital magnetic-isolation chip; the power output ends of the isolated power circuit and the non-isolated power circuit are connected with the pre-stage and post-stage power input ends of the isolated pulse width modulation circuit respectively; the output end of the sampling circuit and the output end of the triangular wave generation circuit are connected with the sampling signal input end and the triangular wave signal input end of the isolated pulse width modulation circuit respectively; and a pulse width output port of the isolated pulse width modulation circuit is connected with a pulse width capture port of the single-chip microcomputer circuit. The digital magnetic-isolation chip is applied to voltage and temperature isolated sampling of the new-energy electromobile, and multiple paths of sampling signals share one triangular wave generation circuit, thereby greatly reducing cost and improving sampling precision effectively.

Description

technical field [0001] The present invention relates to the technical field of new energy electric vehicles, in particular to an isolated sampling circuit for the power battery voltage (also called DCLINK voltage) of the motor controller or the temperature of the motor drive module (i.e. IGBT temperature) and the power battery controller . Background technique [0002] In the motor controller of electric vehicles, it is usually necessary to measure the DCLINK voltage and the temperature of the IGBT for strategic control and fault protection. The sampling of the power circuit by the control circuit needs to be electrically isolated, otherwise the control circuit will be subjected to the surge impact and strong interference of the power circuit, resulting in the control circuit not working properly or even being damaged. At present, the current motor controller mainly has the following methods for sampling the DCLINK voltage and IGBT temperature. [0003] Using linear optica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/20G01R19/25G01D21/02
CPCG01D21/02G01R15/20G01R19/2503
Inventor 彭金城何葵张蕾张红霞陈芳蒋继东
Owner DONGFENG MOTOR CORP HUBEI
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