frequency conversion multi type system 变频多联式空调系统
This paper presents a new type of low noise frequency conversion circuit based on the research of phase noise conception, generation as well as relativity measurement method.
本文在对相位噪声的概念、产生及其相关测量方法研究的基础上，设计出一种低噪声频率变换电路。
The 6kv transducer with the series-wound unit of the PWM pressure type can realize the output of the direct high pressure by collecting a lot of lower frequency conversion pressure.
单元串联多电平pwm电压源型6 k V变频器采用若干个低压PW M变频功率单元串联的方式实现直接高压输出。
The hoist type crane has its best in compactness, legerity and price advantage. Speed modulating by frequency conversion can be used to improve the crane's capacities.
紧凑、轻巧、价格低廉是葫芦起重机的最大优点，在分析几种调速与控制方案的基础上，指出变频调速技术的应用，可以克服葫芦起重机使用中的一些缺点；
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