Repeater Power Supply Of Undersea Optical Cable Communication Systems With Current Source Input

The important means of communication and transmission between trans-sea areas is submarine optical cable communication,and repeaters are an important component of submarine optical cable communication.The submarine optical cable communication power supply network is an important way to connect submarine equipment and shore-based power sources to realize long-distance transmission of electric energy.Generally speaking,it is divided into high-voltage constant voltage remote power supply network and high-voltage constant current remote power supply network.The constant voltage remote power supply network has the characteristics of higher reliability and anti-failure ability and is widely used.The power supply of submarine optical fiber cable communication relay equipment needs to obtain electric energy from the high-voltage constant current remote power supply network to provide stable working power for the relay equipment.Due to the important position of the repeater in the submarine optical cable communication system and the high difficulty of maintenance,the power supply of the relay puts forward very high performance requirements.First,it needs to meet the long service life,and very high reliability and stability.Second,the electrical isolation,volume,weight,protection design,output power quality,and Strict requirements are set for heat dissipation.The traditional current source input power supply for relay equipment is composed of a Zener diode array cascaded DC-DC converter,which has problems such as high system cost,large loss,low efficiency,large volume,low reliability,and difficult heat dissipation.A dual-inductance isolated boost converter circuit with current source input is proposed in this paper.The input of the converter is a current source and the output is a voltage source.The current source can be converted into a voltage source output without external excitation.And to achieve electrical isolation and high reliability,stability and long service life.The dual-inductance isolated Boost converter with current source input has been analyzed in this paper.According to its working mode in discontinuous conduction mode(DCM)and continuous conduction mode(CCM)working conditions State,its working principle,theoretical derivation and key parameter design are analyzed.Based on the theoretical analysis of the working principle of the dual-inductance isolated Boost converter with current source input,the control strategy is designed and analyzed,and the time average equivalent modeling method is used to model and analyze it.By establishing its DC steady-state equivalent circuit and AC small signal equivalent circuit,its input-output transfer function,control-output transfer function,and output impedance transfer function are obtained.PSIM simulation software is used to build a simulation platform for the dual-inductance isolated Boost converter with current source input.Its working principle and control strategy are verified and analyzed by simulation.By drawing the Bode diagram on it,the compensation network parameters and stability of the converter are analyzed.Finally,it was verified experimentally by designing a 20 W experimental prototype.