Pulse frequency modulation control system 脈沖調(diào)頻控制系統(tǒng)
Pulse frequency modulation magnetic tape record type strong - motion instrument 脈沖調(diào)頻式磁帶記錄強震儀
Pulse frequency modulation pfm 脈沖頻率調(diào)制
Pfm pulse frequency modulation 脈沖頻率調(diào)制
Pl pulse frequency modulation 脈沖頻率調(diào)制
Pulse frequency modulation 脈沖頻率燈
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 在完成電路原理分析與電路設(shè)計的基礎(chǔ)之上,應(yīng)用eda軟件hspice對各個子電路模塊和整體電路進行了功能仿真及量化模擬,仿真結(jié)果均達到或優(yōu)于預(yù)定指標(biāo)。
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,在功率變換系統(tǒng)中常見的有三種調(diào)制模式:脈寬調(diào)制模式( pwm , pulsewidthmodulation ) 、脈頻調(diào)制模式( pfm , pulsefrequencymodulation )和二者可以相切換的pwm / pfm模式。
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電路的兩種工作模式,即連續(xù)電流模式和不連續(xù)電流模式,然后分析了目前應(yīng)用比較廣泛的電流反饋控制模式,最后對頻率寬度調(diào)制( pwm )模式和頻率脈沖調(diào)制( pfm )模式進行了對比分析。
( 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 )建立了超聲電源主電路,其中包括:整流、直流斬波、推挽逆變器和匹配網(wǎng)絡(luò)等部分,實現(xiàn)了大功率超聲頻交流電的輸出,輸出頻率的脈頻調(diào)制( pfm )和輸出功率的脈寬調(diào)制( pwm ) 。