Electric current transducer used for automobile and based on zero magnetic flux compensation

Abstract

The invention relates to an electric current measurement technology, in particular to an electric current transducer suitable for measuring an output current of an automobile alternating-current generator in a mutual inductance mode, a double-storage-battery automobile power supply system including the electric current transducer, and a hybrid electric automobile adopting the double-storage-battery automobile power supply system. The electric current transducer used for an automobile and based on zero magnetic flux compensation comprises a magnetic core wound by an output wire of the automobile alternating-current generator, a secondary winding wound on the magnetic core, a detection winding wound on the magnetic core and a magnetic flux compensation device coupled between the secondary winding and the detection winding, wherein the magnetic flux compensation device supplies compensating current for the secondary winding according to potential difference between two ends of the detection winding, and the potential difference is enabled to tend to zero. According to the electric current transducer used for the automobile and based on the zero magnetic flux compensation, due to the fact that an auxiliary magnetic core and a compensating winding are saved, microminiaturization of the transducer is facilitated.

Description

technical field [0001] The invention relates to current measurement technology, in particular to a current sensor suitable for measuring the output current of an automobile alternator in a mutual inductance manner, a dual storage battery vehicle power supply system including the current sensor, and a hybrid electric vehicle using the dual storage battery vehicle power supply system. Background technique [0002] The alternator is an indispensable electrical energy generating device in regular cars and hybrid cars. For an automobile's electrical system to function reliably, the output of the alternator, the capacity of the battery, the electrical demand of the starter, and other electrical loads must be properly matched to each other. To this end, accurate measurement of the alternator's output current is a key element. Although the output power of the generator can be determined according to the rotational speed of the engine, this indirect method is unreliable in some case...

AI Technical Summary

Problems solved by technology

[0005] exist figure 1 In the current sensor shown, the auxiliary core T2 and the detection winding N 0 and compensation winding N 3 The addition of the sensor will expand the footprint of the sensor, which is unfavorable for the application and promotion of the car

In addition, the electrical environment and working environment near the alternator are very complicated, and the increase in the number of components will also weaken the anti-interference ability

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