A mobile terminal, a dcdc power supply device and a dcdc power supply circuit thereof

Abstract

The invention is applicable in the technical field of electron and provides a mobileterminal, a DC (direct current) DC power supply device, and a DCDC power supply circuit thereof. The DCDC power supply circuit comprises a DCDC power supply module and an amplification feedback module; and the amplification feedback module acquires input voltage of electricity load, performs phase advanced processing, amplification processing and voltage-dividing processing on the input voltage when the input voltage fluctuates, and outputs feedback voltage to the DCDC power supply module, and the DCDC power supply module adjusts the input voltage according to the feedback voltage. In the invention, when the input voltage fluctuates, the input voltage is subjected to phase advanced processing and amplification processing, so that delay of feedback routing is counteracted, the adjustmentstrength on load transient fluctuation by the DCDC power supply circuit can be enhanced, and the transient response speed of the DCDC power supply circuit is increased.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a mobile terminal, a DCDC power supply device and a DCDC power supply circuit thereof. Background technique [0002] The DCDC power supply circuit refers to a power supply circuit whose input is direct current (Direct Current, DC) and whose output is also direct current. In actual engineering, the distance between the output end of the DCDC power supply circuit and the load end is relatively long, and the voltage drop of the printed circuit board (Printed Circuit Board, PCB) has reached a non-negligible level, especially when the output of the DCDC power supply circuit When the current is large, the PCB trace voltage drop can reach several volts, which will make the voltage at the load terminal lower than the output terminal voltage of the DCDC power supply circuit. In order to make the load terminal voltage meet the demand, the DCDC power supply terminal needs t...

AI Technical Summary

Problems solved by technology

In order to make the load terminal voltage meet the demand, the DCDC power supply terminal needs to obtain the load terminal voltage, and the traditional feedback power supply position is all at the DCDC power supply terminal, which makes the detected load terminal voltage change inaccurate

[0003] In order to accurately detect the voltage change of the load terminal, the current existing technology sets the feedback power-taking position close to the load terminal. However, because this method increases the length of the feedback trace, when the current consumed by the load suddenly becomes larger or smaller , the time when the voltage change at the load terminal is fed back to the DCDC power supply terminal will be greatly delayed, thereby reducing the transient response speed of the DCDC power supply circuit

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