scholarly journals An Improved Current-Doubler Rectifier for the Marine Controlled Source Electromagnetic Transmitter

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Hongxi Song ◽  
Yiming Zhang ◽  
Yu Zhang
Keyword(s):  
Direct Current ◽  
Transformation Efficiency ◽  
Heating Temperature ◽  
Mineral Resources ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Controlled Source ◽  
Insulated Gate Bipolar Transistor ◽  
Electromagnetic Transmitter ◽  
Zero Voltage

High power marine controlled source electromagnetic transmitters have gained interest with applications in marine geological survey and mineral resources exploration. The direct current to direct current (DC-DC) converter that is typically used in marine transmitters has some issues, as the insulated-gate bipolar transistor (IGBT) tube cannot achieve zero-voltage switching (ZVS). In particular, lagging-leg switching cannot easily achieve ZVS. The conversion efficiency of the heat converter requires improvement. This paper proposes an improved current-doubler rectifier for the marine controlled source electromagnetic transmitter (ICDR-MCSET). Resonant inductance is increased and a blocking capacitor is added to the converter (DC-DC) circuit, where the converter can achieve ZVS in a wide load range. This results in the effective decrease of the heating temperature and the improvement of transformation efficiency. Saber software simulation and a 20 KW electromagnetic transmitter are used to verify the results, which show that the method is feasible and effective.

scholarly journals Extension of Zero Voltage Switching Capability for CLLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 818
Author(s):  
HwaPyeong Park ◽  
DoKyoung Kim ◽  
SeungHo Baek ◽  
JeeHoon Jung
Keyword(s):  
Input Voltage ◽  
Voltage Gain ◽  
Resonant Converter ◽  
High Power Conversion Efficiency ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Voltage Variation ◽  
Sinusoidal Current ◽  
Zero Voltage ◽  
Voltage Switching

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.

Study of an Isolated DC-DC Converter for Fuel Cell Applications

2016 ◽  
Vol 839 ◽  
pp. 65-69
Author(s):  
Sakda Somkun ◽  
Shanmugham Prabhuraj ◽  
Chatchai Sirisamphanwong
Keyword(s):  
Fuel Cell ◽  
Output Voltage ◽  
High Efficiency ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Analysis And Design ◽  
Switching Regimes ◽  
Light Load ◽  
Zero Voltage ◽  
Voltage Switching

This paper presents the analysis and design of a dual active bridge DC-DC converter for fuel cell applications. The zero voltage switching operating condition of such converter is analyzed to select an appropriate turn ratio of the high frequency transformer for a high efficiency operation. The ratio between the output voltage to the fuel cell voltage should be close to the transformer turn ratio to guarantee the zero voltage switching regimes at a light load. The prototype converter was designed to be suitable for the input voltage of 40 to 65 V and output voltage of 360 to 400 V with the transformer turn ratio of 7.33. The converter was tested with a 48 V DC power supply and with a polymer electrolyte membrane fuel cell stack. The maximum power of 700 W was delivered and the efficiency was better than 94% for the whole load range.

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