Abstract
This paper presents a dc-link capacitor reduction method with P-MOS integrated control method. When compared with SCR chopping method, this novel method can easily integrate the auxiliary switch and control function circuits into one simple chip. Furthermore, the P-MOS control ground can be directly connected onto bus ground. This connection method is convenient to integration and easy drive. The theoretical analysis and detailed control method is given. Furthermore, one ultra-high efficiency GaN-based 65W prototype is made to verify it. The results show that with 27uF*4 bulk caps and integration control method, efficiency can achieve 93.4% at 90VAC with the PCB size 44*31*31mm, 42.3cc under the same dc-link capacitance. Dynamic and EMI performance are also verified. This method is suitable to commercial controller integration for ultra-density and high-efficiency type-c power delivery (PD) applications.
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