Non-contact three-phase current detection system

A three-phase current and detection system technology, applied in the direction of using digital measurement technology for measurement, can solve the problems of large size, high cost of current sampling sensor, complex wiring harness, etc., to achieve better performance, simple structure, and stable sampling.

Inactive Publication Date: 2020-06-02
DONGFENG MOTOR CORP HUBEI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, current sampling sensors are usually used for three-phase current sampling. However, current sampling sensors have problems such as high cost, large volume, and complicated wiring harnesses.

Method used

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  • Non-contact three-phase current detection system
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Embodiment Construction

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be un...

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Abstract

The invention discloses a non-contact type three-phase current detection system. The system comprises an induced loop current sampling unit, a magnetic induction sampling unit, a current shaping unit,a signal processing unit and a current monitoring unit; the magnetic induction sampling unit is a magnetic induction chip and is matched with the current sampling unit, and the magnetic induction sampling unit is used for inducing the three-phase current acquired by the induced loop current sampling unit; the current shaping unit is used for shaping the three-phase current sensed by the magneticinduction sampling unit; the signal processing unit is used for performing analog-to-digital conversion and filtering processing on the shaped three-phase current; and the current monitoring unit is used for verifying the three-phase current processed by the signal processing unit according to a preset current error. The non-contact three-phase current detection system provided by the invention not only is simpler in structure, but also can realize accurate and stable sampling and verification diagnosis of the three-phase current, and is better in performance.

Description

technical field [0001] The invention relates to the technical field of new energy vehicle control, in particular to a non-contact three-phase current detection system. Background technique [0002] With the shortage of energy and people's demand for environmental protection, electric vehicles have developed rapidly in recent years. As the electric drive system of the "heart" of electric vehicles, its inverter controller unit directly determines the performance indicators of electric vehicles. As one of the key performance indicators of the electric drive system, the three-phase current sampling capability directly affects the torque control capability of the electric drive system, the selection of insulation capacity and the working life of electronic components. In order to improve the power density of the inverter and reduce the cost, it is necessary to accurately sample the three-phase current in the inverter control system, so that the three-phase current sampling has b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 张红霞孙志华朱相军王华买晢旭
Owner DONGFENG MOTOR CORP HUBEI
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