The Research of the Parallel Switching Power Supply Module System

The power supply system is consist of several parallel power modules, how to achieve steady voltage shunt of the parallel module is one of the most significant problems of the power design. This essay is concentrate on the double closed loop control system, the one with lots of advantages. Such as the structure of the system is easy, the performance of the system is steady, we can regulate the fixed value momentarily and it is completely practicality. The hardware part of the system is consist of antihypertensive switching power supply, main circuit, control circuit, protect circuit and so on. This essay is concentrate on the master slave control. Using the TL494 as control core to create the PWM wave, and use the step-down DC/DC switching power which has the highest control efficiency to create the stable 8V output. The internal error amplifier of TL494 is able to implement the double closed loop (voltage in external ring, current in internal ring) then we can achieve the current distribution. We can regulate the reference voltage to change the concrete distribution ratio. Moreover this dissertation discusses the basic principle and introduces the implement scheme.