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读了本刊1992年第2期“变压器能改变直流电压吗?”一文,感觉原文后面的结论欠妥。原文前半部指出:“脉动直流电I中还有不变化的直流成份I′,且I′通常占总电流l的大部份,这部份电流……在变压器绕组中……产生大量的焦耳热。”这段话是对的。
Read the article “Transformer can change the DC voltage?” in the second issue of 1992, feeling that the conclusion behind the original text is not right. The first half of the original text states: “There is a constant DC component I′ in the pulsating DC current I, and I′ usually accounts for most of the total current l. This part of the current... in the transformer winding... generates a lot of Joule heating. This is correct.