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Study on the Current Test Circuit of Magnetic Saturation of Power Inductor

Author: HuaSha
Tutor: MaHongTao
School: Hebei University of Science and Technology
Course: Measuring Technology and Instruments
Keywords: Magnetic saturation current Magnetization curve Power Inductors Pulse width modulator Power drive
CLC: TN86
Type: Master's thesis
Year: 2011
Downloads: 90
Quote: 1
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Abstract


The switching power supply is a power very widely in recent years , and its quality has a direct impact on the reliability of electronic equipment . The high - frequency magnetics transformer is an important component in the switching power supply . Electronic circuits , often poor unreasonable because of the high frequency transformer design or production process led to the high-frequency transformer the magnetic saturation damaged switching power supply . Therefore, the current value when the test high frequency transformer magnetic saturation occurs is very important. Amateur conditions , it is more difficult to measure high-frequency transformer magnetic saturation current . First introduced for the above, the basic concept of the magnetic element , and on the basis of detailed analysis of the magnetic material the magnetization curve , the tape cores of the magnetic saturation of the current detection circuit of the power inductor , this circuit simulation to test out the high - frequency transformer achieve the current value when the magnetic saturation . Power inductor the magnetic saturation current test method is the use of low-frequency , low- voltage , high-current analog high-frequency , high- voltage work state . This article is designed based on the power of the half-bridge circuit inductor the magnetic saturation current test circuit . This circuit from the pulse width modulator output two bipolar pulse signal, and after the two-channel pulse is amplified through the power drive , direct drive of the two power FET composed of the half - bridge circuit, the signal through the outside of the half-bridge circuit . the connected power inductor can simulate high frequency switching power supply transformers reach magnetic saturation process , test out the size of the magnetic saturation current and magnetic saturation characteristics . Verified by experiments , arrived at the circuit to the safe and reliable operation to achieve the design requirements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply
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