Design, Analysis, and Modeling of an Isolated Constant-Current to Constant-Voltage Converter in Cabled Underwater Information Networks

Abstract

The underwater electric energy conversion modules are the equipment for distributing electric energy to the electric instruments in the cabled underwater information networks (CUINs), which are also related to the normal and stable operation of the underwater systems, the energy foundation and an important part of the network platform. Based on the classic push-pull high frequency switching circuit of constant voltage conversion, an isolated constant-current to constant-voltage (CC-CV) converter based on pulse width modulation (PWM) feedback was proposed in this paper. Through the theoretical analysis of the working principle of the CC-CV converter and the modeling of the converter circuit based on the state space method, it was verified that the designed converter can achieve the constant current to constant voltage transformation by high-frequency PWM feedback. Based on Saber simulation software, the circuit model of the CC-CV converter was built, and the feasibility of the design was proved by simulation analysis. According to the isolated high-frequency switching CC-CV converter circuit, the physical prototype was made. By adjusting the resistance value of the output load, the constant voltage (CV) characteristic of the output voltage of the converter was analyzed. Furthermore, the results show that the output voltage of the designed CC-CV converter is stable and the ripple of output voltage is less than 5%, when the input current or output load resistance is adjusted under the CC output status, which has the CV output characteristic. The CC-CV converter has good rationality and feasibility, and is suitable for the future development of the constant current remote power supply system of CUINs.

Power distribution system for Xiangshan Internet of Underwater Things

“…Besides, fault detection and isolation are easy for CC cabled observatory network. Unlike "AC" or "DC constant voltage" systems on land, the technology related to cabled observatory network using "DC constant current" transmission is extremely limited in land application scenarios, and it is difficult to directly migrate the existing technologies from land to apply the energy conversion technology of constant current to constant voltage (CC/CV), node power reconfiguration method, and multi-module-stack architecture electrical energy conversion technology [1].…”

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

“…The CC/CC converters are responsible for shunting the trunk cable current. The CC/CV converters mainly convert constant current to constant voltage in order to provide energy for transmission and for controlling and monitoring equipment in the nodes [22]. Regardless of whether they are open-loop control or closed-loop control, the CC/CC converters and CC/CV converters in the nodes only perform electrical energy conversion and cannot stabilize the output power of the nodes.…”