However, low efficiency of CC to CV conversion with the shunt method limits its application, especially in scenarios of varying loads. Furthermore, the equivalent load power-stability control circuit would facilitate live equipment replacement and maintenance for CUINs.Ī constant current (CC) underwater observatory employing the shunt method to provide constant voltage (CV) power for external loads is favored in occasions where shunt-fault tolerance is required. Thus, the influence of the branch line cable on the trunk line cable is reduced, and the reliability of the underwater constant current power supply system is improved. The results show that when the load resistance changes within a large range (including when the load has an open circuit or short circuit fault), the equivalent load is basically unchanged or changed within a very small range for the constant current source, causing the constant current source to maintain stable output voltage and output power. In order to prove the feasibility of the converter design, the working state of the circuit under different load values was analyzed and the performance of circuit was verified through simulation and experiments. This circuit can change its own working state according to the size of the load and play a role in power compensation. To avoid instability and collapse of the power system caused by rapid changes in load, we propose an equivalent load power-stability control circuit suited for an underwater constant current power supply system.
To ensure reliable operation of the CUINs, the stability of the remote power supply system, a key component of underwater power facilities, is essential. The subsystem functionality is further described in the following sections.Ĭabled underwater information networks (CUINs) have evolved over the last decade to provide abundant power and broad bandwidth communication to enable marine science. A separate subsystem monitors and reports power and ground-fault status. Dual microcontroller-based supervisor boards execute commands from shore to control power to users, power to system boards, and the routing path of data flow. Overall, system operation is controlled and monitored by the junction box control systems. In addition, there are seven individual modems for low data rate users. They are responsible for multiplexing the high-speed instrument data onto the lower speed modem channels. The five data concentrators (Comcons) each consist of a PC/104 stack and four modems. The frequency-division multiplex (FDM) system divides the SD channel into many narrow-band analog channels that are suitable for commercial telephone modems or any other analog signal with a bandwidth less than 4 kHz. The SD channel analog interface is a passive filter and summing network, which separates the uplink (to H2O) high-band and downlink (from H2O) low-band signals while matching to the impedance of the SD cable.
Power from the SD cable is converted, regulated, and monitored by the power system.
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