{"id":1993,"date":"2024-07-19T14:18:27","date_gmt":"2024-07-19T08:48:27","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=1993"},"modified":"2025-07-16T15:15:19","modified_gmt":"2025-07-16T09:45:19","slug":"halfwave-rectifier","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ee\/power-electronic\/halfwave-rectifier","title":{"rendered":"1-\u03c6 Halfwave Rectifier with R-L Load and Free-wheeling Diode"},"content":{"rendered":"

\"Halfwave<\/p>\n

The SCR is triggered at \u03c9t = \u03b1, the source voltage vs<\/sub> appears across load as vo<\/sub>. At \u03c9t = \u03c0, the voltage vs<\/sub> becomes zero, just after this instant, freewheeling diode FD is forward biased.
\nAssuming waveform, we can see that SCR is reversed biased for \u03c0 radian (\u03c9t = \u03c0 to \u03c9t = 2\u03c0), so circuit turn off time<\/p>\n

\"Waveform\"<\/p>\n

Waveforms:<\/strong><\/h2>\n

\"Waveforms\"<\/p>\n

The advantage by using freewheeling diode are:
\n<\/strong><\/h3>\n

(i) input power factor is improved\"<\/p>\n

(ii) load current waveform is improved
\n(iii) as a result of (ii) load performance is better and
\n(iv) as energy stored in L is transferred to R during the freewheeling period, overall converter efficiency improves.<\/p>\n

NOTE:<\/strong> FD prevents the load voltage V0<\/sub> from becoming negative.<\/p>\n

Principle of Operation of Step-up Choppers<\/h2>\n

When the average output voltage V0 greater than input voltage Vs , then the chopper is called step up chopper.<\/p>\n

\"Operation<\/p>\n

In this chopper, a large inductor L in series with source voltage Vs<\/sub> is essential as shown in figure. When the chopper CH is on, the closed current path is as shown in figure<\/p>\n

\"Step<\/p>\n

and inductor stores energy during Ton<\/sub> period. When the chopper CH is off, as the inductor current cannot die down instantaneously this current is forced to flow through the diode and load for a time Toff<\/sub>. As the current tends to decrease, polarity of the emf induced in L is reversed as shown.<\/p>\n

\"Source<\/p>\n

<< Previous<\/a> | Next >><\/a>
\n Must Read: <\/strong> What is Power Electronics?<\/strong><\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

The SCR is triggered at \u03c9t = \u03b1, the source voltage vs appears across load as vo. At \u03c9t =<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[511,5],"tags":[548,549,547],"class_list":["post-1993","post","type-post","status-publish","format-standard","hentry","category-power-electronic","category-ee","tag-freewheeling-diode","tag-principle-of-step-up-choppers","tag-waveforms"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/1993","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=1993"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/1993\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=1993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=1993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=1993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}