POWER MANAGEMENT CIRCUIT AND MOBILE TERMINAL

摘要

The present disclosure relates to a power management circuit and a mobile terminal having a first switch for blocking current. The first switch blocks an input of an external power supply in a case that a predetermined load operates in a large current/voltage mode. A bi-directional DC converter boosts a battery voltage and supplies it to the load. Thus, the circuit is simplified and the number of components is reduced for power management.

主权项

1. A power management circuit, comprising:
a bi-directional DC converter comprising a low-voltage terminal, a first high-voltage terminal and a second high-voltage terminal, and configured to convert a first voltage at said first high-voltage terminal into a second voltage and supply said second voltage at said low-voltage terminal in a buck mode, or to convert said second voltage at said low-voltage terminal into said first voltage and supply said first voltage at said first high-voltage terminal in a first boost mode, or to convert said second voltage at said low-voltage terminal into a third voltage and supply said third voltage at said second high-voltage terminal in a second boost mode; a supply terminal for being electrically coupled to an external power supply or a first load; a load terminal for being electrically coupled to a second load; a capacitor being electrically coupled between said load terminal and a ground terminal; and a first switch being electrically coupled between said supply terminal and said first high-voltage terminal, wherein said first switch is turned off in a case that said second load operates in a first mode and said supply terminal is electrically coupled to said external power supply, wherein said power management circuit is configured to electrically couple said second high-voltage terminal to said load terminal and output electric energy to said load terminal by controlling said bi-directional DC converter to operate in said second boost mode, in a case that said second load operates in said first mode.