Stabilization of the feedback loop of a switching power supply

eeleader

Stabilization of the feedback loop of a switching power supply [Copy link]

When designing a DC-DC switching power supply with 24V input and 300V output and 5.5KW, I chose the UC3879 chip and made a full-bridge phase-shift topology. The experiment below 600W is basically completed. I will replace the high-power MOS for further adjustment and current mode adjustment, but I found that the feedback loop is unstable. I simulated it on SABER. I would like to ask if anyone has done closed-loop total gain simulation on SABER? What are the steps? How to test the closed-loop total gain (how to choose the test point)

CSCL

This question is very professional, about the use of SABER software and the specific simulation of power supply. I guess we are only half-baked and cannot answer such a detailed question. I will work hard and share my experience with everyone!

helloxx

How is the original poster doing? I use 3525 for push-pull, output 18~36V, output 450 regulated voltage, use optocoupler and 431 to achieve, now there is a problem in the feedback loop, during the regulated process, the 3525 output PWM will lose the wave