Abstract
The two-inductor boost converter has been previously presented in a zero-voltage switching (ZVS) form where the transformer leakage inductance and the MOSFET output capacitance can be utilized as part of the resonant elements. In many applications, such as maximum power point tracking (MPPT) in grid interactive photovoltaic systems, the resonant converter is required to operate with variable input output voltage ratios. This paper studies the variable frequency control of the ZVS two-inductor boost converter to secure an adjustable output voltage range while maintaining resonant switching transitions. The design method of the resonant converter is thoroughly investigated and explicit control functions relating the circuit timing factors and the voltage gain for a 200 W converter are established. Three sets of theoretical, simulation and experimental waveforms are provided for specific operating points. A variation of the basic circuit, the resonant converter with a voltage clamp, which is capable of operating with a wider output voltage range but a lower switch voltage stress, is also given at the end of the paper
Highlights
The two-inductor boost converter was developed by applying the duality principle to the half bridge converter and is classified as a boost derived converter [1]
As the converter has a lower switch conduction loss and a full utilization of the transformer, it has found intensive applications where low input voltages are required to be converted to high output voltages such as grid interactive photovoltaic (PV) converters and uninterrupted power supplies [2]-[6]
The resonant two-inductor boost converter has been developed as shown in Fig. 1 [7]
Summary
The two-inductor boost converter was developed by applying the duality principle to the half bridge converter and is classified as a boost derived converter [1]. As the converter has a lower switch conduction loss and a full utilization of the transformer, it has found intensive applications where low input voltages are required to be converted to high output voltages such as grid interactive photovoltaic (PV) converters and uninterrupted power supplies [2]-[6]. One significant barrier on the way to increase the switching frequency of the two-inductor boost converter is the transformer leakage inductance, which causes higher switch voltage stress and lower converter efficiency. The resonant converter is able to absorb the transformer leakage inductance and the MOSFET output capacitance into the resonant tank and the Zero-Voltage Switching (ZVS) condition can be achieved. This paper studies the variable frequency operation of the resonant two-inductor boost converter, which has an input voltage of 20 V, a maximum output of 340 V and a 200 W rating. The converter with the voltage clamp is able to achieve a wider output voltage range and a lower switch voltage stress
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