一般的串聯諧振轉換器(Series Resonant Converter, SRC)在輕載條件下操作時，因為諧振電流不夠大造成開關無法零電壓導通，本論文實現一種半橋SRC電路操作在輕載時其中一顆開關能零電壓導通的控制策略，在輕載時效率確實能夠提升。電路操作主要分為兩種模式，第一種操作模式在一般負載情況下為變頻定責任週期，第二種操作模式在輕載情況下為非對稱縮減責任週期，無論負載如何變動均能穩定輸出電壓。本論文控制IC將和市售的IC CM6900比較其控制策略的優缺點，以及闡述如何實現驅動波形。此晶片IC採用台積電0.35μ CMOS製程，模擬結果分析製程變異和溫度變異驗證本功率IC的功能在不同的環境下可以正常工作，製程變異所造成的差異可由外部元件調整，開關切換頻率範圍為20 kHz ~ 300 kHz可依使用者設計的規格來調整。而所占用之晶片面積大小為0.7127 mm2，可以大大縮減電路的面積，非常適用在高轉換效率的轉換器的產品上，有助於大幅提升相關產品的競爭優勢。

This thesis aims to design a control IC for realizing the zero-voltage turn-on switching of a half-bridge series resonant converter (SRC) circuit and raising the efficiency at light load. Under normal load conditions, the circuit is operated at pulse-frequency modulation (PFM). A pulse-width modulation (PWM) strategy with constant frequency operation is adopted at light load condition to regulate the output voltage. Some performance comparisons between the realized control IC and a commercial CM6900 IC are presented and discussed in details. The studied control IC is implemented by TSMC 2P4M 0.35μm CMOS process. The simulation results are shown to verify the feasibility of the realized control IC under different process and temperature variations. The wide varied-frequency range can be achieved from 20 kHz ~ 300 kHz. The chip size is only 0.7127 mm2.

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