Power switching circuit and power switching method thereof

Abstract

The invention discloses a power switching circuit and a power switching method thereof. The power switching circuit comprises a first switching circuit, a second switching circuit and a slow starting circuit. The first switching circuit is coupled with a first power supply end, and breakover or turnoff is determined according to the voltage level of the first power supply end. The second switching circuit is coupled among the first switching circuit, a second power supply end and load, and breakover or turnoff is determined according to the voltage level of a power supply and a second power supply. The slow starting circuit is coupled between the first switching circuit and the load. When the voltage level of the first power supply end is larger than a preset value, breakover of the first switching circuit and turnoff of the second switching circuit are achieved. When the voltage level of the first power supply end is lower than the preset value, turnoff of the first switching circuit and breakover of the second switching circuit are achieved, and breakover of the slow starting circuit is achieved after the breakover of the first switching circuit lasts for a preset time. According to the power switching circuit and the power switching method, power supply management is achieved through a hardware circuit design mode, and resource consumption is further reduced.

Description

technical field [0001] The invention relates to a power switching circuit, in particular to a power switching circuit for preventing instantaneous inrush current and a power switching method realized by using the power switching circuit. Background technique [0002] With the rapid development of science and technology in recent years, the types and output of electronic products are also increasing, such as notebook computers, wireless sharers, PDAs (handheld computers), digital cameras, and mobile phones. In the design of on chip (SOC), in order to effectively use the power supply, the dual power design (dual power) is widely used in various electronic devices. [0003] Please refer to figure 1 , showing a structure diagram of a power management system 100 with a dual power supply design. The power management system 100 includes a first power source 101 , a second power source 102 , a power switching circuit 103 and a load 104 . Wherein, when the first power source exist...

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