A pulse-skipping mode psm control method suitable for primary-side feedback flyback converter
A flyback converter, primary-side feedback technology, used in control/regulation systems, conversion of DC power input to DC power output, instruments, etc. The problem of large variation range is disadvantageous, to achieve the effect of saving chip area, easy filtering, and facilitating integration
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[0020] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0021] The PSM control method of the present invention can adaptively adjust the number of PSM jump cycles and the peak current of the primary side according to the working state of the circuit, so that the output voltage of the primary side feedback flyback converter is constant, and the efficiency under light load of the system is effectively improved. And the output voltage ripple is reduced. At the same time, the PSM control mode has the advantages of fast response speed, good electromagnetic compatibility, strong robustness, and strong anti-interference ability under light load conditions.
[0022] figure 1 It is a circuit example of a PSM control system suitable for the primary side feedback flyback converter of the present invention. The main topology is an AC-DC primary side feedback flyback converter, and the PSM control system samples the kne...
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