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Sensor for current detection based on new energy automobile inverter

A new energy vehicle and current detection technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problem of meeting the needs of new energy vehicle inverter current detection products with high current, small size, high reliability and low cost detection and other issues, to achieve the effect of improving product environmental reliability, high-precision detection, and small size

Pending Publication Date: 2018-11-06
MIANYANG WEIBO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing Hall current sensor is difficult to meet the high current, small volume, high reliability and low-cost detection requirements of new energy vehicle inverter current detection products, and the purpose is to provide a new energy vehicle inverter based on Transformer current detection sensor to solve the above problems

Method used

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  • Sensor for current detection based on new energy automobile inverter
  • Sensor for current detection based on new energy automobile inverter
  • Sensor for current detection based on new energy automobile inverter

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Embodiment 1

[0025] Such as Figure 1~4 As shown, the present invention is based on a new energy vehicle inverter current detection sensor, which can be used for high reliability and fast measurement in the case of small volume, high current and continuous power supply. It can detect two channels of measured current signals, and each channel includes a magnetic circuit and a measurement circuit. The magnetic circuit includes a ring core 1 to convert the measured current into a magnetic field; the measurement circuit includes a Hall element and its peripheral circuit. The component is centered and vertically placed in the center of the opening of the ring magnetic core 1, and the measured magnetic field is converted into a Hall potential output by using the principle of the Hall effect. By detecting the output Hall voltage, it can indirectly reflect the magnitude of the measured input current.

[0026] Specifically, in order to improve product reliability and reduce product volume, the Hal...

Embodiment 2

[0028] Such as figure 1 , Figure 4 As shown, this embodiment is optimized on the basis of Embodiment 1. J1 is a dedicated automotive-grade plug-in terminal for providing power and output interfaces; T1 / T2 are bidirectional TVS diodes for EMC protection of power and output terminals ; N1 / N2 is an integrated Hall IC, which converts the magnetic field detected by the ring core 1 into a Hall potential output, and the pin 3 of the Hall IC is grounded to improve the ESD protection capability; C1 is used to power the Hall IC chip VCC Perform decoupling filtering; C2 / C3 / R1 / R2 are used for Hall potential output filtering. Toroidal core 1 in figure 1 Not reflected in location.

[0029] The sensor is powered by a low-voltage single power supply of 5V, and the static power consumption of the product is determined by the Hall IC, generally 10mA. Hall IC sensitivity K N The gear selection is determined by the ring magnetic core 1 opening l, the output specification V 0 and the measur...

Embodiment 3

[0031] Such as figure 2 As shown, this embodiment has been optimized on the basis of the above-mentioned embodiments, and the external dimensions of the ring magnetic core 1 are shown in figure 2 shown. Ring magnetic core 1 selects silicon steel strip with high saturation magnetic induction intensity, low loss, and low coercive force, and the opening of ring magnetic core 1 is determined by the measured current size I 0 And the saturation magnetic induction intensity Br of the magnetic material is determined. The annular magnetic core 1 is processed by die, which can improve the batch consistency of the product and reduce the product cost. The position and size of the stacked riveting are not marked in the figure.

[0032] The annular magnetic core 1 is fixed by injection molding into the casing. The thickness of the injection molding plastic is not less than 0.8mm. It is recommended to choose PV66+30% GF or PBT+30% GF for the plastic to achieve normal use in the environm...

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Abstract

The invention discloses a sensor for current detection based on a new energy automobile inverter. According to the sensor for current detection, a phase W and a phase U for a current detection unit are arranged in the sensor; two paths of current signals are simultaneously detected; a magnetic circuit and a measuring circuit are arranged in each of the phase W and the phase U; each magnetic circuit comprises a ring magnetic core; the belonging measuring circuit comprises a Hall element and a peripheral protection circuit thereof; the detected input current penetrates through the center of thering magnetic core; the detected current is converted into a magnetic field by the ring magnetic core; the Hall element is arranged in the center of an opening of the ring magnetic core; the Hall element body is perpendicular to a magnetic line of force, and the detected magnetic field is converted into a Hall potential to output by utilizing a Hall effect. The sensor is particularly applicable tocurrent detection occasions such as new energy automobile inverters, motors and the like, the low-cost high-reliability design requirements are finally met by virtue of reasonable device selection and circuit design, and the problem that high current cannot be detected at high accuracy under a small size is solved.

Description

technical field [0001] The invention relates to an inverter current detection sensor, in particular to a sensor for detecting inverter current based on new energy vehicles. Background technique [0002] Up to now, China has 777,000 new energy vehicles, and it is expected to exceed 2 million in 2020. With the rapid development of the domestic new energy vehicle market, the demand for sensors for new energy vehicle inverter current detection is also increasing. Previously, the Hall current sensor of Swiss LEM was used, but the price was high and it was not suitable for large-scale use. [0003] Traditional domestic Hall current sensors are composed of separate components and winding magnetic cores, which are difficult to meet the high reliability and low cost requirements of new energy vehicle detection products. In addition, considering the special application environment, the current sensor is required to meet the characteristics of small size, high current, low temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R1/04
CPCG01R1/04G01R19/00
Inventor 阳桂蓉罗志强
Owner MIANYANG WEIBO ELECTRONICS
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