Extension of Zero Voltage Switching Capability for CLLC Resonant Converter

TheCLLC resonant converter has been widely used to obtaina high power conversion efficiency with sinusoidal current waveforms and a soft switching capability. However, it has a limited voltage gain range according to the input voltage variation. The current-fed structure canbe one solution to extend the voltage gain range for the wide input voltage variation, butit has a limited zero voltage switching (ZVS) range. In this paper, the current-fed CLLC resonant converter with additional inductance is proposed to extend the ZVS range. The operational principle is analyzed to design the additional inductance for obtaining the extended ZVS range. The design methodology of the additional inductance is proposed to maximize the ZVS capability for the entire load range. The performance of the proposed method is verified with a 20 W prototype converter.

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Zero voltage switching over entire load range and wide voltage variation of parallelly-connected dual-active-bridge converter using power-circulating operation

2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia) ◽

10.1109/ifeec.2017.7992090 ◽

2017 ◽

Cited By ~ 1

Author(s):

Hayato Higa ◽

Jun-ichi Itoh

Keyword(s):

Load Range ◽

Zero Voltage Switching ◽

Dual Active Bridge ◽

Voltage Variation ◽

Zero Voltage ◽

Voltage Switching

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Zero voltage switching assistance design for DC-DC series resonant converter with constant input current for wide load range

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL) ◽

10.1109/compel.2017.8013353 ◽

2017 ◽

Cited By ~ 6

Author(s):

Tarak Saha ◽

Hongjie Wang ◽

Regan Zane

Keyword(s):

Input Current ◽

Resonant Converter ◽

Constant Input ◽

Load Range ◽

Zero Voltage Switching ◽

Series Resonant ◽

Zero Voltage ◽

Voltage Switching

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Analysis of a Wide Voltage Hybrid Soft Switching Converter

Electronics ◽

10.3390/electronics10040473 ◽

2021 ◽

Vol 10 (4) ◽

pp. 473 ◽

Cited By ~ 1

Author(s):

Bor-Ren Lin ◽

Yen-Chun Liu

Keyword(s):

Power Conversion ◽

Input Voltage ◽

Soft Switching ◽

Resonant Converter ◽

Solar Pv ◽

Load Range ◽

Pwm Converter ◽

Load Voltage ◽

Zero Voltage Switching ◽

Circulating Current

A hybrid PWM converter is proposed and investigated to realize the benefits of wide zero-voltage switching (ZVS) operation, wide voltage input operation, and low circulating current for direct current (DC) wind power conversion and solar PV power conversion applications. Compared to the drawbacks of high freewheeling current and hard switching operation of active devices at the lagging-leg of conventional full bridge PWM converter, a three-leg PWM converter is studied to have wide input-voltage operation (120–600 V). For low input-voltage condition (120–270 V), two-leg full bridge converter with lower transformer turns ratio is activated to control load voltage. For high input-voltage case (270–600 V), PWM converter with higher transformer turns ratio is operated to regulate load voltage. The LLC resonant converter is connecting to the lagging-leg switches in order to achieve wide load range of soft switching turn-on operation. The high conduction losses at the freewheeling state on conventional full bridge converter are overcome by connecting the output voltage of resonant converter to the output rectified terminal of full bridge converter. Hence, a 5:1 (600–120 V) hybrid converter is realized to have less circulating current loss, wide input-voltage operation and wide soft switching characteristics. An 800 W prototype is set up and tested to validate the converter effectiveness.

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