Interleaved high-step-up zero-voltage switching dc-dc converter

• Main Authors: YANG, SHANG YI, YANG, SUNG PEI, SU, WEI FU, CHEN, SHIN JU
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention relates to an interleaved high-step-up zero-voltage switching DC-DC converter. Primarily, the secondary windings of two coupled inductors are connected in series and capacitance-diode voltage doubling circuit architecture is guided to achieve high voltage gain. The high voltage gain is achieved with two design degrees of freedom of a coupled inductor turns-ratio and a switch-on ratio. So the high voltage gain is achieved without operating at extreme duty ratio. An active clamp circuit is added into the secondary windings of two coupled inductors, thus all switches realize zero-voltage switching soft-switching performance to reduce the switching losses and improve the conversion efficiency. The two main switch stresses are much lower than the output voltage such that the low-voltage-rated MOSFETs with low RDS(ON) are available to reduce the conduction losses. Input current ripples can be canceled out to reduce the size of the input current ripples due to the interleaved operation. The energy of t