A power supply circuit based on Qualcomm platform

Abstract

The present invention provides a power supply circuit based on a Qualcomm platform, characterized in that the power supply circuit includes: a power supply module for DC-DC conversion of direct current; and a peak absorption circuit connected with the power supply module for Absorbing spikes and glitches in the direct current provided by the power supply module; wherein, the spike absorption circuit includes: a first inductor and a second inductor, both of which are connected to the power supply module connected; and a first RC series circuit connected to the first inductor; a second RC series circuit connected to the second inductor. The power supply circuit based on the Qualcomm platform provided by the present invention is simple and reliable in circuit design, flexible in use and convenient in debugging, so that the power supply of the mobile phone is stable, so that the operation of the product is more stable and the battery life is improved.

Description

Technical field [0001] The invention relates to the field of electronic circuits, in particular to a power supply circuit based on a Qualcomm platform. Background technique [0002] Many switching power supply DC-DC and linear power supply LDOs are used in the power supply system of the existing Qualcomm platform to measure the quality of a power supply. Ripple is an important parameter, and the ripple of the linear power supply will be better than the switching power supply. The linear power supply is superior to its own operating characteristics and has a large ripple. It has a particularly large impact on weak signals such as audio power supply circuits. These circuits must be designed to consider the impact of power supply noise on performance. The existing Qualcomm platform power supply Buck DC-DC design, such as figure 1 As shown, the PM8909 chip is connected to two inductors L801 and L802 respectively. The output voltage ripple in this design is very large, and the filter...

AI Technical Summary

Problems solved by technology

The output voltage ripple of this design is very large, and the filter inductance in the switching power supply will generate extremely high anti-peak voltage at the moment of switching

On the other hand, even if the inverse peak voltage of the inductor is not considered, the signal spectrum is broadened due to the sudden change in voltage of the switching tube at the moment of switching.

These two aspects will lead to strong radiation interference and noise ripple when the switching power supply is working, and may even affect other circuits in extreme cases

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