非隔離型直流-直流倍壓轉換器具 電流回授控制之研製

The Research of Non-Isolated DC - DC Converter with Voltage Double Current Feedback Control

林志南(Chih-Nan Lin)

指導教授 ： 劉煥彩

國立虎尾科技大學/電機資訊學院/電機工程研究所在職專班/碩士(2013年)

摘要

摘 要
目前昇壓轉換器中，電壓增益、效率轉換器是一研究的關鍵技術。本研究的轉換器是具備有昇壓轉換器、順向轉換器、返馳式轉換器三大特性的昇壓-順向-返馳式轉換器。轉換器的優點是具備有較高電壓增益及較高效率及較大電流的優點。本電路只需要一組脈寬調變訊號輸出，與一顆開關電晶體所構成的轉換器，藉由能量轉換元件來達成電力轉換的效果。本電路架構簡單，具備有能量回送的功能，可以達到主動式箝位，可降低元件電壓應力的特性，進而提高效率。
本轉換器中其缺點是回授增益不易控制，本次研究的控制IC是UC3845，使用這一顆IC的PWM功能加上運算放大器製作成的電流回授控制迴路，可以控制電流回饋信號，進而達到穩定電路的功用。
本研究測試中發現轉換器電流回授信號擷取時，會出現雜訊信號的波形。這些雜訊訊號是不好控制，如果要控制這些雜訊信號必須要做信號處理。本研究雜訊信號處理的做法是量化處理。量化處理過程中採取的方法有 擷取信號-比例控制-濾除雜訊-數據化等四個步驟來處理信號。經過量化處理後的信號，可以達到穩定的直流信號。直流信號再經過電流回授控制迴路做控制，由電流回授控制的輸出端控制UC3845的控制端，可以得到良好的控制。由於UC3845 第三腳會有懸浮的現象，在電流保護動作時，保護要截止的時候，必須將UC3845第三腳電壓快速的降到0V，才能將保護動作截止，以達到快速恢復，所以必須要有電流控制歸零電路。
經過電流回授控制迴路電路可達到良好的輸出和穩健的效果。研究的過程中轉換器經過電流回授控制迴路在200W實測效率實測在87%，未經電流控制電路時的測90%，效益損為3%。當負載電流在1.05A時立即保護。當負載電流在0.95A時立即恢復。

關鍵字

昇壓-順向-返馳轉換器 ； 高電壓增益 ； 主動式箝位 ； 電流回授控制 ； 信號處理

並列摘要

Abstract
The voltage gain and efficiency for boost converter is one of the key technology of this research. This converter of study includes boost converter, forward converter, flyback converter have three characteristics Boost - forward - flyback converter. The advantage of the converter with a higher gain and a higher voltage and higher current efficiency advantages. The circuit requires only a pulse width modulation signal output, and a switching power converter is composed of crystals. By the energy transfer element to achieve the effect of the power converter. This circuit structure is simple. With a loopback function of the energy can reach the active clamp. Can reduce the stress element voltage characteristic. Thus improving efficiency.
The disadvantage of this converter is not easy to control feedback gain. This study's control IC UC3845 in using PWM function for IC and OP-Amp plus made into the current feedback control loop to control the current feedback signal . Thereby to stabilize the circuit function.
This converter current feedback signal capture there will be noise signal waveform. These noise signals are not easy to control. If you want to control these noise signals must be done signal processing. In this study. The noise signal processing approach is quantized. Quantization process has Captured the signal - Proportional control - Filter noise - Data of the four steps to deal with signals. The quantized signal processing. Can achieve a stable DC signal. DC signal and then through the current feedback control loop as a control. Controlled by the current feedback control UC3845 output control terminal can get good control. The number 3 pin will be suspended due UC3845 phenomenon in current protection. The protection to be cut-off. It must be UC3845 number 3 pin voltage quickly drops 0V. Before closing the protective action in order to achieve fast recovery. It must be a current control circuit is zero.
After a current feedback control loop circuit can achieve a good output and effects. Course of the study the converter circuit through the current feedback control efficiency at 200W measured at 87%. Without current control the measured 90% of the efficiency loss of 3%. When the load current is 1.05A immediately protected. When the load current is 0.95A resume immediately.

並列關鍵字

Boost-Forward-Fly back converter ； High voltage gain ； Active clamp ； Current feedback control ； Signal Process

參考文獻

參考文獻

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[3]2010.11.24，“無鐵心式霍爾效應比流器新型電流偵測之智慧型小幫手”，台灣區電機電子工業同業公會電子報，第 149 期。

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