| 1. | Pulse frequency modulation control system
脉冲调频控制系统 |
| 2. | Pulse frequency modulation magnetic tape record type strong - motion instrument
脉冲调频式磁带记录强震仪 |
| 3. | Pulse frequency modulation pfm
脉冲频率调制 |
| 4. | Pfm pulse frequency modulation
脉冲频率调制 |
| 5. | Pl pulse frequency modulation
脉冲频率调制 |
| 6. | Pulse frequency modulation
脉冲频率灯 |
| 7. | The simulation results are all in accordance with the theory analysis , some even better than the theoretical specification . the basic principle of discrete pulse frequency modulation on step - up dc / dc converter is testified , and this effort accumulates more experience to design
在完成电路原理分析与电路设计的基础之上,应用eda软件hspice对各个子电路模块和整体电路进行了功能仿真及量化模拟,仿真结果均达到或优于预定指标。 |
| 8. | At present , there are three kinds of modes of modulation including pulse width modulation ( pwm ) , pulse frequency modulation ( pfm ) and the modulation of combination of pwm and pfm . lots of products using above modulations are designed in many famous companies
目前,在功率变换系统中常见的有三种调制模式:脉宽调制模式( pwm , pulsewidthmodulation ) 、脉频调制模式( pfm , pulsefrequencymodulation )和二者可以相切换的pwm / pfm模式。 |
| 9. | First , the operational principle of the boost converter which includes continuous mode and discontinuous mode was analyzed as well as the basic theory about current mode and the circuit modulation which includes pulse width modulation ( pwm ) and pulse frequency modulation ( pfm )
首先分析boost电路的两种工作模式,即连续电流模式和不连续电流模式,然后分析了目前应用比较广泛的电流反馈控制模式,最后对频率宽度调制( pwm )模式和频率脉冲调制( pfm )模式进行了对比分析。 |
| 10. | （ 2 ） the major circuit has been established , composed of rectifier 、 buck - chopper 、 push - pull inverter and matching network , which realizes high - power supersonic ac output . to achieve maximal output power , the pulse frequency modulation ( pfm ) has been applied to auto - adjustment of output frequency , which corresponds to the load ' s resonant frequency
（ 2 ）建立了超声电源主电路，其中包括：整流、直流斩波、推挽逆变器和匹配网络等部分，实现了大功率超声频交流电的输出，输出频率的脉频调制（ pfm ）和输出功率的脉宽调制（ pwm ） 。 |
