Abstract
This paper presents a concept for the operation of a resonant DC–DC switched-capacitor converter with very high efficiency and output voltage regulation. In its basic concept, such a converter operates as a switched-capacitor voltage doubler (SCVD) in the Zero Current Switching (ZCS) mode with a constant output voltage. The proposed methods of switching allow for the switched-capacitor (SC) converter output voltage regulation, and improve its efficiency by the operation with Zero Voltage Switching (ZVS). In this paper, various switching patterns are proposed to achieve high efficiency and the output voltage control by frequency or duty cycle regulation. Some examples of the application of the proposed switching patterns are presented: in current control at the start-up of the converter, in a bi-directional converter, and in a modular cascaded system. The paper also presents an analytical model as well as the relationships between the switching frequency, voltage ratio and efficiency. Further, it demonstrates the experimental verification of the waveforms, voltage ratios, as well as efficiency. The proposed experimental setup achieved a maximum efficiency of 99.228%. The implementation of the proposed switching patterns with the ZVS operation along with the GaN-based (Gallium Nitride) design, with a planar choke, leads to a high-efficiency and low-volume solution for the SCVD converter and is competitive with the switch-mode step-up converters.
Highlights
The switched-capacitor (SC) conversion principle applied in power electronic converters is a promising technology [1]
The concepts of control for a resonant switched-capacitor voltage doubler are presented. They allow the use of the SCVD converter as a fully functional DC–DC converter with output voltage regulation and very high efficiency
A classic Switch-Capacitor Voltage Multiplier (SCVM) operates in the ZCS mode, in which switching power losses associated with
Summary
The switched-capacitor (SC) conversion principle applied in power electronic converters is a promising technology [1]. Zero current switching (ZCS) converters can achieve high efficiency, which is demonstrated in [5,6,7]. Presented in Figure 1), their output charge can be reduced by the reverse current flow in the transistor this paper introduces a method switching off the SCVD The method of the reduction oss in Qoss losses (the losses resulting from the output at transistor turn-ons) that is that proposed in this in paper the input shape charge. In [29], a comparison of power dissipation under the soft switching operation converter, and its resistive losses. The lowest losses are reported there for the GaN GIT transistors (such type of switches is the experimental tests presented in this paper). In [30], it has been concluded thatdevices devices have a better switching performance those
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