There is no limit to creativity, and the instrument is invented. Today, I will introduce a national invention patent for the invention - the detection device and method of the current sensor. The patent was filed by BYD Co., Ltd. and was issued an authorization announcement on September 7, 2018.

Description

The present invention relates to the field of current sensor technologies, and in particular, to a device and method for detecting a current sensor.

Background of the invention

At present, the method of detecting whether the current sensor is good or not is mainly realized by detecting whether the Hall chip embedded in the gap of the current sensor core is bent. First, the operating current sensor is supplied with a working voltage of +/-15V. Secondly, a magnetic screwdriver is used to adjust the potentiometer in the current sensor (for example, a potentiometer with a resistance value of 200k ohms) to see if the multimeter reads positive or negative. If the output value is not within the range of ¡À20mv, adjust it to within ¡À20mv. Then insert a magnetic screwdriver into the air gap of the core, that is, on both sides of the Hall chip, so that the Hall chip senses the magnetic field of the magnetic screwdriver. At this time, check if the value on the multimeter is within ¡À10mv. When the current sensor is in static operation, use a magnetic screwdriver as a magnet to add a magnetic field to the Hall chip in the current sensor. If the multimeter reading exceeds ¡À10mv, indicating that the Hall chip in the current sensor is bent, the current sensor can be judged to be defective; if the multimeter is within ¡À10mv, the current sensor can be judged to be good.

A disadvantage in the prior art is that the above test method is tested by manual operation, and an error may occur, resulting in very poor accuracy. Specifically, when the position of the Hall chip is at the position where the magnetic field strength is the strongest in the air gap of the magnetic core, the static output of the current sensor can be roughly reflected, and it is not possible to accurately detect whether the Hall chip is bent. When the position of the Hall chip is not at the position where the magnetic field strength is the strongest in the air gap of the core, the magnetic field on both sides of the Hall chip is unbalanced, so the static output of the current sensor is out of range. Therefore, when the position of the Hall chip is not at the position where the magnetic field strength is the strongest in the air gap of the core, the existing test method is not applicable, and it is impossible to accurately detect whether the Hall chip is bent.

Summary of the invention

The present invention aims to solve the above technical problems at least to some extent.

Model diagram of current sensor to be tested according to an embodiment of the present invention

To this end, a first object of the present invention is to provide a current sensor detecting device that generates a test current by a test current generator and applies the test current to a conductor, and the controller receives an output voltage generated by the current sensor to be tested. According to the output voltage, the current sensor is detected, which improves the accuracy and reliability of the detection, makes the detection of the current sensor easier and more intelligent, and effectively reduces the leakage detection of the current sensor defective product.

A second object of the present invention is to provide a method of detecting a current sensor. To achieve the above object, a detecting device for a current sensor according to an embodiment of the first aspect of the present invention includes: a conductor interposed in a magnetic ring of a current sensor to be tested; and a test current generator for generating a test And applying a test current to the conductor such that the current sensor to be tested senses a magnetic field generated by the test current by the Hall chip to generate an output voltage; and a controller that controls The device is connected to the output end of the current sensor to be tested, and is configured to receive an output voltage generated by the current sensor to be tested, and detect the current sensor to be tested according to the output voltage.

In the detecting device of the current sensor of the embodiment of the invention, the test current is generated by the test current generator, and the test current is applied to the conductor, the controller receives the output voltage generated by the current sensor to be tested, and measures the current sensor according to the output voltage. The detection improves the accuracy and reliability of the detection, making the detection of the current sensor easier and more intelligent, and effectively reducing the missed detection of the current sensor defective product.

A second aspect of the present invention provides a method for detecting a current sensor, comprising the steps of: inserting a conductor into a magnetic ring of a current sensor to be tested, and applying a test current generated by the test current generator to the conductor. Upper, in order to cause the current sensor to be tested to sense the magnetic field generated by the test current through the Hall chip, thereby generating an output voltage, causing the current sensor to be tested to generate an output voltage; and controlling the test connected to the conductor a test current generated by the current generator; collecting an output voltage generated by the current sensor to be tested; and detecting the current sensor to be tested according to the output voltage.

The detection method of the embodiment of the invention realizes the automatic opening or closing of the control test current generator by controlling the power source of the test current generator to detect the current sensor to be tested, thereby effectively preventing the circuit from being short-circuited and improving. Safety during detection; and the automatic adjustment of the test current generated by the test current generator replaces the manual knob to adjust the test current, which facilitates the detection and improves the accuracy of the detection.