Abstract
A DC–DC switching power supply parallel power supply system is designed, which can stabilize the output voltage and distribute the module current. And more power is obtained by switching power supply and suitable for more load circuits. Two circuit modules of BUCK chopper are used to form two parallel main circuits of DC–DC. And the master–slave setting method is adopted in the two DC–DC modules. The output circuit is controlled by the combined control mode of DSP and MCU. In order to realize the voltage stability of the load end and the current distribution of each module, double closed-loop control is adopted by the parallel power supply system. And the outer loop is the voltage control loop, the inner loop is the current control loop, and the PID control algorithm is realized by software. The circuit is debugged which is designed in this paper and the efficiency is analyzed. The results show that the functional indexes meet the design requirements. And the structure of the system is simple. The PID controller can be realized by software, and the whole system runs efficiently and stably.
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