LLC 諧振轉換器用於各種電源供應器已愈趨廣泛,此種轉換器有高效率、低 EMI、零電壓切換、零電流切換等特點,切換損失遠小於其他 PWM轉換器,高頻應用時可縮小體積,且諧振電感可整合於變壓器中。為因應尺寸減小和成本降低的商品化需求,本文提出了一個新的一次側穩壓PSR(Primay Side Regulation)方法,為LLC轉換器提供一次側回授控制。所提方法主要藉由一次側輔助線圈,感應一電壓訊號,作為輸出電壓回授控制使用,以取代習用的二次側穩壓SSR(Secondary Side Regulation)控制。本文實作一組110~240V輸入、48V/100W輸出之實驗原型LLC諧振轉換器,以驗證所提PSR一次側穩壓方法,並將結果與傳統方法比較。
The LLC resonant power converter has been found increasing applications in the field of power supplies. It features high efficiency, low EMI, zero voltage switching and zero current switching. The switching losses are much less than that of the PWM converters. Besides, the resonant inductor can be designed to integrate into the transformer. To cope with the demands of smaller size and reduced cost for commercial products, this paper proposes a new PSR (Primary Side Regualtion) method to replace the SSR(Secondary Side Regulation) for LLC resonant converter output voltage control. In this method, an auxiliary coil at the primary side is utilized to induce a voltage signal, which is then processed to be used for output voltage regulating purpose. The proposed method is verified through a prototype LLC resonant converter with input voltage 110~240V and output 48V/100W. The result was compared with that of the traditional method.