本质参数 meaning in English

essential parameter

The components , working principle , advantages and defects of pwm power amplifier are introduced briefly in the dissertation . the working characteristics of h - bridge pwm power amplifier in double - polarity mode is analyzed qualitatively and qualitatively and the conclusion that fluctuant magnitude and continuousness of armature current are the essential parameters which can be used to evaluate pwm control modes
论文简要介绍pwm功率放大器的组成、工作原理、特点及存在问题；对常见h型双极性模式pwm功率放大器的工作特性作了定性和定量的分析，指出了电枢电流脉动量和电枢电流连续与否是衡量pwm控制方案优劣的两个本质参数。