摘要：當(dāng)前，變頻技術(shù)已經(jīng)獲得了廣泛使用，但是變頻電量的計(jì)量卻是空白。本文提出了一種用于計(jì)量和測(cè)試產(chǎn)品性能的大量程寬范圍變頻功率標(biāo)準(zhǔn)源的設(shè)計(jì)。采用DDS作為信號(hào)發(fā)生器，分別產(chǎn)生一定頻率的電壓信號(hào)和電流信號(hào)，信號(hào)控制全橋開(kāi)關(guān)功率放大器，再驅(qū)動(dòng)線性功率放大器，分別輸出電壓和電流，并對(duì)電壓電流進(jìn)行測(cè)量并反饋回控制器，用PI算法進(jìn)行閉環(huán)控制，從而使功率源輸出電壓及輸出電流的真有效值保持穩(wěn)定。實(shí)驗(yàn)結(jié)果表明，系統(tǒng)運(yùn)行穩(wěn)定，電壓電流輸出精度高，達(dá)到了0.1級(jí)。

關(guān)鍵詞： 功率標(biāo)準(zhǔn)源 變頻 DDS

中圖分類(lèi)號(hào)：TM933  文獻(xiàn)標(biāo)識(shí)碼： B  

The research of a wide range frequency conversion standard power source

      Liu Liangjiang¹ Chen Haowei² Peng Zhengliang¹ Wang Ning² Liao Zhongchi²

(1. Hunan Institute Of Metrology & Test, Changsha, 410014; 2. Hunan YINHE ELECTRIC CO. LTD, Changsha, 410073)

Abstract: Nowadays，frequency conversion technology is widely used，but the measurement of frequency conversion energy is blank. The paper presents a new design of wide range frequency conversion standard power source, which is widely used to measure and test product performance. Two DDS are used as signal generators, which individually generate voltage signal and current signal of certain frequency. The signal control switch mode power amplifier, which drive linear power amplifier, Then voltage and current are output. The voltage and current are measured and the signal are feed back to main controller, which control the output using PI arithmetic to keep the effective value of the output voltage and current steady. The experiment result shows that the system run stable and the precision of output voltage and current reached 0.1 grade.

Key words: standard power source, frequency conversion, Direct Digital Synthesizer

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