Mr. Min Zhou Profile

Min Zhou

at Xiamen Univ

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Proceedings Article | 25 November 2009 Paper

Design of a highly stable LD power supply and a highly reliable protection circuit

Min Zhou, Aiwen Zhang, Zhiping Cai, Huiying Xu

Proceedings Volume 7506, 750616 (2009) https://doi.org/10.1117/12.837339

KEYWORDS: Power supplies, Amplifiers, Reliability, Feedback loops, Control systems, Field effect transistors, Switches, Absorption, Switching

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We have contrived some new technologies to design new-style LD power supply in order to pursue the high stability of output current and the reliable working condition. High-performance constant current drive source on the basis of dual operational amplifier with high sensitive feedback loop and voltage regulator module greatly reduces the current ripple and improves the stability of output current. Through precise testing, we obtain the results that the output current ripple is below 0.09% and the output current stable degree is less than 0.03%, which are much lower than those of other existing ordinary LD power supplies. We have also designed a high-efficiency dual slow-start surge-absorbing loop, accompanied by a filter network, which has reduced the impact of the surge current effectively. We obtain that the peak value of surge current is no more than 0.938%, which is advanced in the field of LD power drive designing. Besides, the protection circuit could make circuit loop stay at a certain unchanged status when it is in over-current condition or not, which greatly improve the security and reliability of the whole system.

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