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Switching power supply is a seemingly simple but complex electronic system. It contains many interesting questions.

Generally speaking, the output voltage and input voltage of a voltage reduction system are calculated based on the duty cycle of the switch. For example, if the input is 24V and the output is 12V, the duty cycle should be 50%. This theoretical deduction is not observed in most cases. Because this is derived from a full range switching power supply. In fact, switch mode power supplies generally operate within a range of less than * * output. There is a premise here that the input energy will offset the output energy over a period of time. What if it cannot be offset? Then the switch power supply enters the burst mode (light jump mode), which means that there is a switch waveform output for several consecutive working cycles, and then there is no switch waveform output for several consecutive working cycles. Ensure that the input energy is equal to the output energy. In theory, it can be considered as a switching waveform with lower frequency and duty cycle. It can also be understood that the accuracy of switch control in switch power supply topology is limited. The possible duty cycle resolution in a cycle can only reach 0.5%. In order to achieve an accuracy of 0.01%, more cycles can only be used for approximation. For example, four consecutive switching cycles of 5%, 4%, and 4% form a duty cycle of 4.25%.