GaNBased DCDC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control
Abstract
:1. Introduction
2. Operation Principle of the Resonant Power SCVD
 State 1: transistor S2 is switchedoff and transistor S1 conducts the source current that charges the switched capacitor (SC);
 State 2: transistor S1 is switchedoff and transistor S2 conducts reversely until the inductance current reaches zero; the charging of the SC is continued in this state;
 State 3: transistor S1 is switchedoff and transistor S2 conducts the current that is forced by the source and the switched capacitor to flow to the output;
 State 4: transistor S2 is switchedoff and transistor S1 conducts reversely until the inductance current reaches zero; the charging of the output capacitor is continued.
3. Output Voltage Control of SCVD
3.1. Pattern P2—Continuous Capacitor Current Mode
3.2. Pattern P3—Discontinuous Capacitor Current Mode
4. Efficiency of the SCVD
4.1. Model of Efficiency of the SCVD–Maximum Efficiency of the Converter without Switching Losses
4.2. The Switching Concept for Maximum Efficiency
5. Mixed Switching Patterns in Applications
5.1. StartUp of the Converter
5.2. BiDirectional Converter
 (1)
 In the first state, the SC is being charged from the output voltage source. This state is terminated by turning off the switches S1 and S4;
 (2)
 State 2—the inductor current goes to zero via S2 and S3 (reverse conduction);
 (3)
 In state 3—turning on S3 starts an oscillation in a new circuit, and the energy is transferred to the input source. This is advantageous since the oscillation continues until the inductor current reaches zero. Breaking this oscillation by switching off S3 would start the current flow to the output and charging the output, which would not be favorable to the efficiency of the conversion.
5.3. A SeriesConnected HighVoltageGain System
6. Experimental Setup and Test Results
6.1. Switching Pattern P2–Operation with Continuous Capacitor Current Mode
6.2. Comparison of Operation in the ZCS Mode (Pattern P1) and ZVS Mode (Pattern P2)
6.3. Output Voltage Regulation by the Switching Pattern P3
7. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Pattern  

P1  Operation without voltage regulation. Basic ZCS switching [5,6,7]  
Features:
 
P2  Regulation by switching frequency variation Operation above the resonant frequency with continuous inductor current.  
Features:
 
P3  Regulation by duty cycle control Operation with short pulses and discontinuous inductor current.  
Features:
 
P4  Regulation by duty cycle control  
Features:

Scenario  Mixed Switching Patterns 

Lightload conditions (low predicted conduction losses, high switching losses) 

Highload (predicted conduction losses higher than switching losses in all the cells) 

Transistors  PGA26E07BA  
Diodes  STPSC12065GYTR  
Switched capacitor  220 nF  
Inductor  10.4 μH  
Input capacitor  4 μF  
Output capacitor  4 μF (and 100 μF external bank)  
Input voltage  U_{in} = 200 V  
Resonant frequency  f_{0} = 105.2 kHz 
Purpose  Equipment 

PWM signal generator  FPGAbased: DE0CV Cyclone V Control Board 
Measurements  Scope: Tektronix DPO4054 Current probes TCP0030 Voltage probes THDP0200 Power Analyzer Yokogawa WT1800 
Supply and load  DC power supply Delta SM300, Rigol DP832, Mixed passive and electronic load LDH400P 
IR measurements  FLIR i60 
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Waradzyn, Z.; Stala, R.; Mondzik, A.; Skała, A.; Penczek, A. GaNBased DCDC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control. Energies 2020, 13, 6403. https://doi.org/10.3390/en13236403
Waradzyn Z, Stala R, Mondzik A, Skała A, Penczek A. GaNBased DCDC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control. Energies. 2020; 13(23):6403. https://doi.org/10.3390/en13236403
Chicago/Turabian StyleWaradzyn, Zbigniew, Robert Stala, Andrzej Mondzik, Aleksander Skała, and Adam Penczek. 2020. "GaNBased DCDC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control" Energies 13, no. 23: 6403. https://doi.org/10.3390/en13236403