source:Industry News Popular:adapter release time:2021-06-25 09:28:43 Article author:sznbone
The performance of the output filter electrolytic capacitor directly affects the performance of the power adapter, so does the circuit topology and the rationality of the circuit design of the power adapter also affect the work and life of the output filter capacitor? The conclusion is affirmative. Usually the main circuit of the power adapter The circuit topology mainly includes flyback (including current continuous and current intermittent), single-tube forward (including dual-tube clamp and active clamp), half-bridge and full-bridge, push-pull circuit topology, except flyback circuit In addition to the topology, other forms of circuit topologies can directly provide the input power to the output during the main switch tube conduction period. If the switch tube conduction duty cycle is 100%, then there will be no ripple current on the output filter capacitor. The output filter capacitor also has no meaning. At the same time, if the output filter inductance is infinite, there is no ripple current on the output filter capacitor, so it does not matter what filter capacitor is selected. In fact, in order to stabilize the conduction of the output voltage switch tube It is impossible for the duty cycle to work at 100%,
It can be concluded that when the load current is between 20% and 10% of the rated current, the current is critical and continuous, and the effective value current flowing through the output filter capacitor is 18.26% and 9.13% of the rated output current. It should be said that relative to the output current, This current is relatively small, and has little effect on the output filter capacitor.
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