| Switching power supply is widely used in recent years, its quality directly affects the reliability of electronic equipment. High frequency transformer of magnetic components is the important component in switching power supply. In the electronic circuit, high frequency transformer occurs magnetic saturation lead switching power supply is damaged, because of the irrationality design of high frequency transformer or poor manufacturing process. So, testing the current value of high frequency transformer occurs magnetic saturation is very important. In amateur conditions, measuring saturation current of high frequency transformer is rather difficult.Based on this condition, firstly this paper made system introduction of the basic concept of magnetic components, and based on detailed analysis of magnetization curve of magnetic materials, proposed the test circuit of the magnetic saturation current of power inductor .This circuit can be simulated to test magnetic saturation current value of the high frequency transformer. The test method of the magnetic saturation current of power inductor is by using of low frequency, low voltage, high current analog high frequency, and high voltage condition.This paper proposes based on half-bridge circuit measure magnetic saturation current of power inductor. This circuit uses two bipolar pulse signal of width modulation controller to control power driver. The two pulse were amplified by the power-driven device to drive the half-bridge circuit which consisted by two power field effect transistor. The signal through the external links power inductor of half-bridge circuit can simulate the high frequency transformer of the switching power supply to achieve magnetic saturation and test the value of the magnetic saturation current to get the information of magnetic saturation characteristic. According to the experiment can proved that the circuit can operate safely and reliably. The circuit meets the requirements of the design. |
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