Influence of Inductance on DC/DC Conversion Efficiency

doi:10.12096/j.2096-4528.pgt.20107

Abstract

Abstract:

Aiming at the influence of inductance on DC/DC conversion performance, this paper took the Boost converter as an example to analyze the factors affecting the equivalent circuit and conversion efficiency of Boost converter under the non-ideal conditions, and obtained the relationship between inductance parameters and circuit output voltage and conversion efficiency. On the basis of analyzing the influence of inductance parameters on the current ripple and circuit efficiency, a method to limit the selection range of inductance value was proposed based on the traditional design of filter inductor considering the critical continuous current. The local hysteresis loss and copper loss of KS226-075A core were calculated, and the change trend of DC/DC converter conversion efficiency with the increase of inductance was obtained. Finally, the correctness of the theory and the feasibility of the method were verified by experiments. At the same time, the selection range of inductance was corrected according to the experimental results, and the error between the calculation and experimental results was analyzed and explained.

Key words: power electronic, DC/DC conversion, conversion efficiency, inductance, local hysteresis loss

CLC Number:

TK 01

Fuzhuan WU, Haoyang LI, Xi WU, Mengna CHEN. Influence of Inductance on DC/DC Conversion Efficiency[J]. Power Generation Technology, 2023, 44(4): 576-582.

Figures/Tables 9

Fig. 1 Boost converter circuit under the non-ideal conditions

Fig. 2 Variation curves of η with D under different RL/R

Fig. 3 Relationship between hysteresis loss and current fluctuation

Tab. 1 Inductance parameters

参数	数值
电感因数A_L	175
有效磁路长度l_c/cm	12.5
铁芯截面积A_e/cm²	2.29
铁芯窗口面积W_e/cm²	5.14
铁芯体积V_e/cm³	28.6

Fig. 4 Inductance loss under different inductance values

Tab. 2 Number of inductance turns and inductance values

组别	N	L/μH	组别	N	L/μH
1	18	55.9	5	44	338.6
2	24	104.8	6	49	416.4
3	32	182.6	7	61	662.3
4	40	282.5	8	71	888.6

Fig. 5 Boost synchronous rectifier circuit

Fig. 6 Oscilloscope waveforms of input and output voltage and inductance current

Fig. 7 Efficiency distribution map

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