Development Of Digital High-Power Transmitter's Power Supply

In the vast ocean,food,minerals,energy and other resources are very rich.In the face of population growth,resource depletion,environmental pollution and other issues in the continent,humans begin to turn their attention to the ocean,and increase the development and utilization of marine resources.Competition in the world for marine resources has become increasingly fierce,leading to disputes and conflicts in some areas.Therefore,we must develop marine technology vigorously from an economic perspective or a national security perspective.Water acoustic is a research of ocean exploration,communications and other technologies,and is the basic technology of marine resources development.Low-frequency high-power ultra-long distance is an important development direction of water acoustic technology.The underwater acoustic transmitter is one of the key equipment to realize low frequency ultra-long distance.This paper mainly develops a digital high-power rectifier power supply,which is suitable for low-frequency ultra-long distance underwater acoustic transmitter.According to the power supply's power level,efficiency and other technical requirements,the main circuit uses phase-shifted full-bridge ZVS DC/DC converter,and control circuit uses digital DSP for processing sampling and PI adjustment,to achieve the power supply's control and communication flexibility.The main circuit topology used in this paper is phase-shifted full-bridge.Its main working principle is the use of resonant between resonant inductor and power semiconductor switching device's parasitic capacitance,to achieve power devices zero voltage conduction,greatly reducing the switching loss.The different switching modes of the phase-shifted full-bridge ZVS DC/DC converter are analyzed in detail under the condition that all devices are ideal.Based on the analysis of phase-shifted full-bridge,this paper deduces the parameters of the key devices through theoretical derivation,selects the suitable devices,designs the passive power factor correction of the main circuit,the high-frequency isolation transformer,the output rectifier diode,the output filter circuit,the soft-start circuit,the sampling circuit,phase detection and DSP control procedures,and evaluate the main loss of the circuit.Then the PSIM and MATLAB are used to simulate the main circuit and the key circuits,and the correctness of the circuit's analysis and design is verified.Finally,the power supply in this paper is produced,and the test of power supply is completed.Under the laboratory conditions,the main power test,phase loss protection test,auxiliary power test and soft-start circuit test are completed,focusing on power semiconductor devices-IGBT and output rectifier diodes(through the RC absorption circuit to reduce its reverse spikes)and high-frequency transformer's loss and heat conditions.The test results meet even more than the predetermined technical requirements: power supply rated output DC140V/150 A,rated power 21 kW,output current accuracy ±1%,efficiency(rated power)over 93%,power factor(rated power)over 0.93,with phase loss protection.