Primary-Side Peak Current Measurement Strategy for High-Precision Constant Output Current Control
Primary-Side Peak Current Measurement Strategy for High-Precision Constant Output Current Control
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DOI：
10.1109/tpel.2014.2312955
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发表时间：
2015-02
影响因子：
6.7
通讯作者：
Cheng-Nan Wu;Yang-Lin Chen;Yaow-Ming Chen
中科院分区：
文献类型：
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作者：
Cheng-Nan Wu;Yang-Lin Chen;Yaow-Ming Chen
提出了一种高精度恒流变换器原边峰值电流测量策略。初级侧稳压器（PSR）广泛用于低成本和低功率的发光二极管（LED）照明应用，具有通用输入电压范围。然而，传统的PSR具有电流不准确的缺点，使得LED可能容易损坏。因此，提出了PSR的PCMS方法，以实现高精度的恒定输出电流控制。本文分析了PSR输出电流不准确的真实的原因。推导了输出电流测量误差的数学表达式。然后，提出的PCMS的工作原理。硬件实验测量，以验证所提出的PCMS的性能。实测数据表明，在不同的工作条件下，采用PSR和所提出的PCMS，LED输出电流误差可以限制在±2%以内。
The objective of this paper is to propose the primary-side peak current measurement strategy (PCMS) for the high-precision constant output current converter. The primary-side regulator (PSR) is widely used for low-cost and low-power light-emitted diode (LED) lighting application with universal input voltage range. However, the conventional PSR suffers from the drawback of current inaccuracy so that the LED may be damaged easily. Therefore, the PCMS method for PSR to achieve high-precision constant output current control is proposed. In this paper, the real causes of the output current inaccuracy by using PSR are discussed. The mathematical expression of the output current measurement error is derived. Then, the operation principle of the proposed PCMS is presented. Hardware experimental measurements are presented to verify the performance of the proposed PCMS. The measured data show that by using the PSR with the proposed PCMS, the LED output current error can be limited within ±2% under different operation conditions.