Online Degradation Detection/Prediction Method for Current Transfer Ratio of Photo-Coupler Installed in Digitally-Controlled Switching Mode Power Supply

被引：5

作者：

Nakao, Hiroshi ^{[1
,2
]}

Yonezawa, Yu ^{[1
]}

Sugawara, Takahiko ^{[1
,3
]}

Nakashima, Yoshiyasu ^{[1
]}

Kurokawa, Fujio ^{[2
,4
]}

机构：

[1] Fujitsu Labs Ltd, Nakahara Ku, 1-1,Kamikodanaka 4 Choume, Kawasaki, Kanagawa 2118588, Japan

[2] Nagasaki Univ, 1-14 Bunkyo Machi, Nagasaki, Nagasaki 8528521, Japan

[3] Transtron Inc, Fujisawa Off, Isuzu Motors Shonan R&D Ctr, 2023-18 Endo, Fujisawa, Kanagawa 2520816, Japan

[4] Nagasaki Inst Appl Sci, Div Elect Elect & Informat Technol, Nagasaki 8510193, Japan

来源：

IEEJ JOURNAL OF INDUSTRY APPLICATIONS | 2018年 / 7卷 / 05期

关键词：

photo-coupler; current transfer ratio; CTR; degradation; failure prediction; digitally-controlled power supply;

D O I：

10.1541/ieejjia.7.403

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The software-implemented degradation detection/prediction of the current transfer ratio (CTR) of a photo-coupler installed in a digitally-controlled switching mode power supply was studied. The photo-coupler is one of the key devices in an isolated power supply circuit, which transmits a voltage/current signal to a controller though the isolation gap. If the CTR of the photo-coupler degrades to halfway between the normal value and the threshold of the hardware protection circuit, overvoltage/current may be supplied continuously to the load circuit and possibly cause a severe failure. By comparing the theoretical pulse width modulation (PWM) duty, which is calculated from the input/output voltage and the pre-measured power supply circuit efficiency, and the applied PWM duty, which is calculated via feedback control, CTR degradation is detectable online. In this paper, we describe the concept of this method and verify it using both simulation and prototyping circuits.

引用

页码：403 / 409

页数：7

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