常規的全橋（FB）轉換器已被廣泛地用於高輸入電壓與高功率應用。數個控制方案被應用於全橋轉換器，如對稱的控制，相移控制，和非對稱控制。
採用對稱控制，全橋已經使用了很長時間。患有大的開關損耗，由於其硬開關操作。它會影響轉化效率並限制功率密度。
為了提高效率，不對稱的全橋（AFB）轉換成功提出代替在過去的幾十年。因為它可以實現ZVS操作，開關導通損耗顯著降低。然而，發生直流偏置導致加在變壓器的氣隙。
然而，不對稱控制全橋轉換器具有導致高頻的di/dt雜訊，即電磁干擾（EMI）問題的源之一為產生高脈動輸入電流。因此，需要大濾波器元件以衰減閾值內的雜訊。為了減少脈動輸入電流紋波，低輸入電流紋波降低（RR-AFB）轉換器沒有直流偏置在第二章還提出。
為了演示的操作原理，電路分析的可行性，並與300〜400伏的輸入電壓範圍，24V / 15A /輸出，100k Hz開關頻率所呈現的轉換器的實驗中，驗證理論分析。
為了實現ZVS的改變死區時間用不同的負載所需RR-AFB的所有負載範圍內。並利用數位控制實現死區時間隨著不同的負載變化。

A conventional full-bridge (FB) converter has been widely used for high input-voltage high-power applications. Several control schemes have been applied to full bridge converter, such as symmetrical control, phase shift control, and asymmetrical control.
Employing symmetrical control, full-bridge has been used for a long time. It suffers from large switching losses due to its hard-switching operation. It will impact the conversion efficiency and limit power density.
To improve the efficiency, asymmetrical full-bridge (AFB) converter was successfully proposed instead in the last decades. Because it can achieve ZVS operation, the switching turn-on losses are significantly reduced. However, a DC bias occurs resulting in adding a gap on the transformer.
However, the AFB converter has high pulsating input currents resulting in the generation of high di/dt noise, which is one of the noise sources of the electromagnetic interference (EMI) problem. Consequently, large filter components are required to attenuate the noise level within the threshold value. To reduce the pulsating input-current ripple, a low-input current-ripple reduction (RR-AFB) converter without DC bias is also proposed in Chapter 2.
To demonstrate the feasibility of the operational principle, circuit analysis and the experiments of the presented converters with 300~400 V input voltage range, 24V/ 15A/ output, 100 kHz switching frequency, are built to verify theoretical analysis.
To achieve ZVS for all load range of RR-AFB needed to vary dead time with different load. The operating through analog controller cannot vary the dead time with different load, while the digital controller could. The design and implementations of the digital control for the DC-DC converters have been achieved by using the digital signal processors (DSP).

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