Low voltage largecurrent modle power source

Abstract

Power source module includes first stage DC / DC converter unit converts variable input DC voltage to stable DC output; second stage DC / DC converter unit with fixed duty ratio; control circuit controls output from first stage DC / DC converter unit, and provides driving pulse for second stage DC / DC converter unit with fixed duty ratio. The invented power source provides input voltage in wide range. Synchronous rectified drive signal with stable amplitude can be obtained through second stage DC / DC isolating transformer with fixed duty ratio. The said drive signal can drive synchronous rectification tube directly so as to realize synchronous rectification output. The invention is applicable to power source module in low voltage and large current in high efficiency.

Description

technical field [0001] The invention relates to a module power supply, in particular to a module power supply using a switching converter. Background technique [0002] With the development of electronic technology, the continuous improvement of VLSI integration, and the increasing complexity of the system, the demand for power supplies is becoming more and more compact, general-purpose, low-voltage, and high-power density. The traditional modular power supply uses a single stage to achieve DC / DC conversion, which has certain advantages in terms of cost, but the same topology is difficult to meet the requirements of wide range input and output, especially in the case of low voltage and high current output, it is difficult to obtain sufficient efficiency. Moreover, the working state of the magnetic core is greatly affected by the input and output voltages, making it difficult to optimize the design. Under normal circumstances, the utilization rate is not high, and relatively...

AI Technical Summary

Problems solved by technology

The traditional module power supply uses a single stage to realize DC / DC conversion, which has certain advantages in terms of cost, but the same topology is difficult to meet the requirements of wide range input and output, especially in the case of low voltage and high current output, it is difficult to obtain sufficient efficiency

Moreover, the working state of the magnetic core is greatly affected by the input and output voltages, and it is difficult to optimize the design

Under normal circumstances, the utilization rate is not high, and relatively high efficiency can only be obtained in a certain range; in the case of low-voltage and high-current output, the use of synchronous rectification technology requires complex drive circuits to obtain stable drive pulses; due to the size of the module However, the effective window cross-sectional area of ​​a single magnetic core cannot meet the requirements of higher power output

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