A booster circuit and its signal output method

Abstract

The invention discloses a boosted circuit and a signal output method. The boosted circuit comprises a boosted module, a boosted control module, a ripple signal generation module and a voltage given signal generation module. The boosted control module carries out sampling on an inductance current signal of the boosted module and an output voltage signal. According to a ripple signal, a voltage given signal, the voltage signal and the inductance current signal, wherein the voltage signal and the inductance current signal are acquired through sampling, a driving pulse signal is generated. The boosted module completes a boost change to an input voltage signal under the control of the driving pulse signal and provides direct voltage signal output possessing a ripple component. Because the ripple signal generation module is newly added, the boosted module outputs a voltage signal possessing the ripple component. A backward-stage direct current / direct current link directly generates a jitter frequency effect because the input voltage signal possessing the ripple component so that an electromagnetic interference problem of a power supply system is alleviated.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a boost circuit and a signal output method thereof. Background technique [0002] The frequency shaking technology can effectively make the electromagnetic interference (Electromagnetic Interference, EMI) disturbance signal of the equipment evenly divided in a wider frequency spectrum, so that the equipment can easily pass the relevant electromagnetic compatibility (Electromagnetic Compatibility, EMC) test standard, which is conducive to solving the entire The EMI problem of switching power supply system is favored by switching power supply engineers. [0003] The mainstream configuration of the current communication rectifier module power supply system is a power factor correction (Power Factor Correction, PFC) link + DC / DC (DC / DC) link. The PFC link is the (AC / DC) AC / DC link, which converts the AC input voltage into a DC high voltage with a set amplitude (such...

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Problems solved by technology

[0004] However, when the input voltage of the above configuration structure is an AC voltage, since the amplitude of the output ripple component is proportional to the size of the load, when the load of the Boost circuit is light, the amplitude of the output ripple component is also small. The frequency shaking effect of the stage is not obvious, and the EMI performance of the power system may still not be ideal; if the input voltage of the above structure configuration becomes a DC voltage, the ripple component of the voltage signal output by the Boost circuit that is twice the frequency of the input AC voltage disappears. The frequency shaking effect of the subsequent LLC topology circuit cannot be fully utilized, and the EMI performance of the power system will deteriorate even more.

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