Detailed explanation of rectifier and filter circuit in dc screen_chuanyang electric Co., ltd.
Detailed explanation of the rectifier filter circuit in the DC screen
Date of publication: 2019-5-24
Overview of the rectifier filter circuit in the DC screen: The rectifier filter circuit in the DC screen refers to the circuit that converts AC power into DC power.Most of the rectifier circuits of the DC screen are composed of transformers, rectifier main circuits and filters, etc..It is widely used in the fields of DC motor speed regulation, generator excitation regulation, electrolysis, electroplating, etc..The combined structure of the DC screen filter circuit: the rectifier circuit of the DC screen usually consists of the main circuit, filter and transformer.The filter is connected between the main circuit and the load to filter out the AC component in the pulsating DC voltage.Whether the transformer is set or not depends on the specific situation.The function of the transformer is to achieve the matching between the AC input voltage and the DC output voltage and the electrical isolation between the AC power grid and the rectifier circuit (which can reduce the electrical interference and fault effects between the power grid and the circuit).According to its components, the rectifier circuit can be divided into uncontrolled rectifier circuit, semi-controlled rectifier circuit and fully controlled rectifier circuit..The latter two circuits can be divided into phase-controlled rectifier circuits and chopper rectifier circuits according to their control methods..Since the phase-controlled rectifier circuit adopts the power grid commutation method, no special commutation circuit is required, so the circuit is simple and reliable, and it is widely used.But the phase-controlled rectifier circuit has a lower power factor when the control α is larger, and the harmonic content of the grid-side current is larger..Therefore, in the high-power variable-speed drive, when running at low speed, the use of chopper-controlled rectifier circuit can solve the problem of power factor deterioration.The rectifier circuit is one of the earliest power electronic circuits. It converts alternating current into direct current. It is widely used and has various circuit forms. According to the components, it can be divided into three types: uncontrollable, semi-controllable and full-controllable. The circuit structure can be divided into bridge circuit and zero circuit. According to the number of AC input phases, it is divided into single-phase circuit and multi-phase circuit. According to the direction of the secondary side current of the transformer, it is single-phase or dual-phase, and it is divided into single-phase circuit and single-phase circuit. Double-shot circuit; the practical circuit is the above-mentioned combination structure.The function of the filter circuit of the DC screen: The filter circuit of the DC screen is often used to filter out the ripple in the rectified output voltage. It is generally composed of reactive components, such as a capacitor C in parallel with the load resistance, or an inductor L in series with the load, and Various compound filter circuits composed of capacitors and inductors.Because the reactance element has the energy storage function in the circuit, the parallel capacitor can store part of the energy when the voltage supplied by the power supply increases, and when the power supply voltage decreases, the energy is released to make the load voltage relatively smooth, that is The capacitor has the effect of smoothing; the inductance L in series with the load, when the current supplied by the power supply increases (caused by the increase of the power supply voltage), it stores energy, and when the current decreases, it releases the energy to make the load current Relatively smooth, that is, the inductance L also has a smoothing effect.There are many types of filter circuits. In order to master its analysis rules, it is divided into capacitive input type (capacitor C connected to the front) and inductive input type (inductor L connected to the front).The former filter circuit is mostly used in low-power power supplies, while the latter filter circuit is mostly used in higher-power power supplies (and when the current is large, only an inductor is used in series with the load).The rectifier circuit transforms the AC voltage Ui into a pulsating DC voltage.Then filter the larger ripple component through the filter circuit, and output the DC voltage U1 with smaller ripple..Commonly used rectification and filtering circuits include full-wave rectification and filtering, bridge rectification and filtering, etc..Each filter capacitor C satisfies RL-C=(3~5)T/2, or where T is the period of the input AC signal, and RL is the equivalent load resistance of the rectifier filter circuit.You may be interested: The basic composition of the DC screen The basic atlas of the buried transformer The performance characteristics of the buried transformer The main technical parameters of the buried transformer The core of the buried transformer Multi-point ground fault judgment and detection language Esperanto Chinese simplified Chinese traditional Danish Languages Ukrainian Uzbek Urdu Armenian Igbo Russian Bulgarian Sindish Shona Sinhala Croatian Iceland Galician Catalan Hungarian Afrikaans Zulu Kannada Luxembourgish Hindi Indonesian Sundanese Indonesian Javanese Indonesian Gujarati Kyrgyz Kazakh Turkish Tajik Serbian Sesotho Hawaiian Welsh Bengali Cebuano Nepal Basque Boer (Afrikaans) Hebrew Greek Kurdish Frisian German Italian Yiddish Latin Latvian Norwegian Czech Slovak Slovenian Swahili Punjabi Japanese Pashto Georgian Maori Grammar Polish Bosnian Persian Telugu Tamil Thai Haitian Creole Irish Estonian Swedish Belarusian Xhosa Corsican Lithuanian Somali Yoruba Burmese Romanian Lao Finnish Scottish Gaelic Hmong English Dutch Filipino Samoan Portuguese Mongolian Spanish Hausa Vietnamese Azerbaijani Amharic Albanian Arabic Korean Macedonian Malagasy Marathi horse Rajaram Malay Maltese Khmer Chichewa Esperanto Chinese Simplified Chinese Traditional Danish Ukrainian Uzbek Urdu Armenian Igbo Russian Bulgarian Sindhi Shona Sinhala Croatia Languages Icelandic, Galician, Catalan, Hungarian, Afrikaans, Zulu, Kannada, Luxembourgish, Hindi, Indonesian, Sundanese, Indonesian, Java, Indonesian, Gujarati, Kyrgyz, Kazakh, Turkish, Tajik Serbian, Sesotho, Hawaiian, Welsh, Bengali, Cebuano, Nepali, Basque, Boer (Afrikaans), Hebrew, Greek, Kurdish, Frisian, German, Italian, Yiddish, Latin, Latvian, Norwegian Czech, Slovak, Slovenian, Swahili, Punjabi, Japanese, Pashto, Georgian, Maori, French, Polish, Bosnian, Persian, Telugu, Tamil, Thai, Haitian, Creole, Irish, Estonian, Swedish, Belarus Xhosa, Corsican, Lithuanian, Somali, Yoruba, Burmese, Romanian, Lao, Finnish, Scottish Gaelic, Hmong, English, Dutch, Filipino, Samoan, Portuguese, Mongolian, Spanish, Hausa, Vietnamese, Azerbaijani Amharic, Albanian, Arabic, Korean, Macedonian, Malagasy, Marathi, Malayalam, Malay, Maltese, Khmer, Chichewa, and the text-to-speech feature is limited to 200 characters. 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