Level detection circuit, phase change detection circuit, and optical disk apparatus.
电平检测电路，相变检测电路，以及光盘装置。
Based on the detailed analysis of basic principle, the traditional three-phase short-circuit criterion of phase selection element based on sudden-change of phase current differential is improved.
在详细分析相电流差突变量选相基本原理的基础上，对传统相电流差突变量选相元件三相短路故障判据进行了改进。
It brings a new PFC circuit and analyzes the principle of the resonant PFC, thus get the simple model with single phase time change for analyse.
提出了一种新型的功率因数校正(PFC)电路，分析了准谐振pfc的工作原理，进而得到单相时变简化分析模型。
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