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pulse frequency

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pulse frequency 【無線電】脈沖頻率。

【無線電】脈沖頻率。 “pulse“ 中文翻譯：   n. 〔sing., pl. 〕 豆類；豆。 “frequency“ 中文翻譯：   n. 1.屢次，頻仍，頻繁。 2.(脈搏等的)次數，出現 ...“frequency pulse“ 中文翻譯：   頻率脈沖“pulse-frequency“ 中文翻譯：   脈沖頻率“pulse to pulse frequency jumping“ 中文翻譯：   脈間跳頻“pulse-to-pulse frequency shifting signal“ 中文翻譯：   脈間跳頻信號“abnormal pulse frequency“ 中文翻譯：   脈率異常“carrier frequency pulse“ 中文翻譯：   載頻脈沖“carrier-frequency pulse“ 中文翻譯：   載頻脈波“clock pulse frequency“ 中文翻譯：   時鐘脈沖頻率“frequency time coding of pulse“ 中文翻譯：   脈沖頻率時間編碼“frequency-coded pulse compression“ 中文翻譯：   頻率編碼脈沖壓縮“frequency-time coding of pulse“ 中文翻譯：   脈沖頻率時間編碼“gas pulse frequency“ 中文翻譯：   燃氣脈沖頻率“high frequency pulse“ 中文翻譯：   高頻脈沖“high frequency pulse generator“ 中文翻譯：   高頻脈沖發生器“low frequency pulse therapy“ 中文翻譯：   低頻脈沖電療法“low pulse frequency“ 中文翻譯：   低脈沖頻率“multi-frequency pulse“ 中文翻譯：   多頻脈沖“multi-frequency pulse mfp“ 中文翻譯：   多頻脈沖“output pulse frequency“ 中文翻譯：   輸出脈沖頻率“output-pulse frequency“ 中文翻譯：   輸出脈沖頻率“pfm pulse frequency modulation“ 中文翻譯：   脈沖頻率調制; 脈頻調制“pl pulse frequency modulation“ 中文翻譯：   脈沖頻率調制“prf pulse repetition frequency“ 中文翻譯：   脈沖重復頻率

pulse radar

The converter was designed to drive up to a 5 white leds with a constant current when the device operates with pulse width modulation ( pwm ) and to power an organic led display with a constant voltage when the circuit operates in pulse frequency modulation ( pfm ) for higher efficiency 它采用1 . 5微米bicmos / dmos工藝,輸入電壓范圍是2 . 7 5 . 5v ,電路以恒定電流驅動5個串連白光led或者以恒定電壓驅動一個oled顯示器。在輸出恒定電壓時采用pfm調制方式;輸出恒流時則采用pwm調制方式。

In order to solver the existed problem , a serial load resonant converter with compensated resonant inductor circuit topology is presented in the paper . moreover , to enhance the anti - disturbing ability of power supply system , the control strategies of pulse frequency modulation ( pfm ) and frequency tracking methods ( ftm ) are adopted 該公司原有臭氧電源采用將逆變器輸出方波電壓經升壓變壓器,直接施加于臭氧發生器上,存在開關管損耗大和開關應力大、開關管和吸收回路發熱嚴重、效率低等問題,限制了電路的輸出功率進一步提高。

The temperature range is - 30 ~ 80 . the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis . then based on the conventional pfm control scheme , a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established 然后在傳統的脈沖頻率調制方式的基礎上,分析了一種離散脈沖頻率調制方式,并建立了這種調制方式下升壓型dc / dc變換器在電流連續( ccm )工作模式和電流斷續( dcm )工作模式的狀態空間平均模型。

A new type high efficiency synchronous step - up dc / dc converter for hand - held device is designed in this thesis . it works in the pfm ( pulse frequency modulating ) mode , and its switching frequency can up to 500 khz . it offers a built - in synchronous rectifier that reduces size and cost by eliminating the need for an external schottky diode and improves overall efficiency by minimizing losses 本文設計了一種用于移動電子設備的高效同步整流的dc / dc升壓芯片,該芯片采用pfm (脈沖周期調制)調制方式,工作頻率最高可達500khz ,內部集成功率管作為同步整流管,代替傳統的肖特基二極管,導通電阻僅有0 . 4

（ 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絡等部分，實現了大功率超聲頻交流電的輸出，輸出頻率的脈頻調制（ pfm ）和輸出功率的脈寬調制（ pwm ） 。

With the development of the converter drive technology , the requirement for the variable frequency drive are becoming more and more strict especially for the modern converter drive employing fast switching semiconductor igbt ， though it has high pulse frequency and refreshing time of only nanoseconds , it generates emf that has adverse effect on the environment 隨著頻率控制傳動技術的發展，對頻率變速傳動系統的要求越來越高，尤其是對采用快速切換的igbt半導體現代變頻技術，盡管脈沖頻率高或更斷時間僅毫微秒內，但它們會對周圍環境產生電磁場。

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,即連續電流模式和不連續電流模式,然后分析了目前應用比較廣泛的電流反饋控制模式,最后對頻率寬度調制( pwm )模式和頻率脈沖調制( pfm )模式進行了對比分析。

The comparison of the calculation formula for unsteady jet flow with that of steady jet flow demonstrates that the pulse frequency is the main factor influencing the velocity coefficients 2 and 5 , and the relationship between the velocity coefficients of pulsed jet flow and steady jet flow was revealed 通過與恒定射流的流速系數計算式對比，闡明了脈沖頻率是影響2和5的主要因素，溝通了脈沖射流與恒定射流流速系數之間的關系。

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,在功率變換系統中常見的有三種調制模式:脈寬調制模式( pwm , pulsewidthmodulation ) 、脈頻調制模式( pfm , pulsefrequencymodulation )和二者可以相切換的pwm / pfm模式。

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計的基礎之上,應用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,仿真結果均達到或優于預定指標。

In gan hemt gate pulse experiments , drain current under pulse conditon collapsed about 47 % than direct current condition and the pulse width affected little on current collapse . the relationship between drain current and pulse frequency is ncoxw [ m + ( n + k ? ) vgs + ( n + k ? ) vgs2 ] ( vgs - vth ) 2 / l 在ganhemt柵極脈沖電流崩塌測試中,觀察到柵脈沖條件下漏極電流比直流情況下減小了47 % ;隨著信號頻率的改變,漏極電流按ncoxw [ m + ( n + k

The theory of soplat using frequency rate is discussed in chapter 2 . based on this theory , this chapter studies the observed discrete - time signal . the crlb of continuous wave and coherent pulses frequency estimation are also studied 論文第二章討論了利用頻率變化率的單站無源定位原理,在此基礎上,介紹了單站無源系統中接收信號的模型,并分析基于各模型的頻率估計的cramer - rao下界。

Multiple funcyions available : start / crater arc current , increase / decrease time , base , crest value current , pulse frequency , pulse rate , post flow time , hf / friction welding , water / gas cooling 功能豐富：起始/收弧電流、上升/下降時間、基值電流、峰值電流、脈沖頻率、占空比、滯后關氣時間分別可調，高頻/接觸引弧、水冷/氣冷可供選用。

The pulse frequency and the ladder wave frequency are two factors that affect the range of velocity adjusting . the range of velocity adjusting is finally decided by the lesser 從步進頻率和階梯波頻率兩個方面對細分驅動系統的調速域值進行了分析，得出調速域值受兩方面綜合影響，而且最終結果取兩者中域值范圍較小者。

Acr data loggers are easy to use , self powered , and pocket - sized devices that measure and record temperature , relative humidity , electric current , pressure , process signals , pulse frequency , power quality and more 并且小型的設備可測量及記錄溫度、相對濕度、電流、壓力、處理信號、脈波頻率、電源品質等。

To the discharge in the air gap , with the increase of applied voltage , the discharge area is larger , and the time interval is smaller , and discharge pulses frequency is higher 對于間隙中的放電情況,施加電壓越高,放電區域越大,放電時間間隔越小,放電脈沖頻率越高;電壓進一步升高,放電轉化為穩定的輝光放電。

Multiple functions available ： start / crater arc current , increase / decrease time , base / crest value current , pulse frequency , pulse rate , post flow time , hf welding 功能豐富：起始/收弧電流、上升/下降時間、基值電流、峰直電流、脈沖頻率、占空比、滯后關氣時間分別可調，高頻引弧。

The maximum 50500 photo counts per second with 76mhz pump pulse frequency is detected . the probability to be single - photon state of every count is better than 99 % 5 在抽運光脈沖重復頻率為76mhz的情況下，得到了每秒50500次的下轉換光子記數，其中單光子概率大干99 。

Empty sum frequency is entered in the normal functioning of the electrical pulse frequency gradually rise to the highest frequency step electrical bad step 空載牽出頻率是指步進電機在正常運轉情況逐漸升高脈沖頻率使步進電機不失步的最高頻率。