Linear low-dropout voltage conversion circuit, working method thereof, power supply device and working method thereof

Abstract

The invention provides a linear low-dropout voltage conversion circuit, a working method thereof, a power supply device and a working method thereof. The circuit comprises a first port voltage detection circuit, a second port voltage detection circuit, a relative voltage comparison circuit, an access selection circuit, a first control switch, a second control switch and a low-dropout linear voltage stabilizer. The method comprises the steps of acquiring a first detection signal of the first port voltage detection circuit, a second detection signal of the second port voltage detection circuit and a comparison signal of the relative voltage comparison circuit; acquiring voltage states of the first power supply port and the second power supply port according to the first detection signal, thesecond detection signal and the comparison signal; and controlling the first control switch or the second control switch to be conducted according to the voltage states. By applying the linear low-dropout voltage conversion circuit, the conversion efficiency of the low-dropout linear voltage stabilizer can be effectively improved.

Description

technical field [0001] The present invention relates to the technical field of power supply management, in particular, to a linear low dropout voltage conversion circuit, to a working method of the linear low dropout voltage conversion circuit, to a power supply device applying the linear low dropout voltage conversion circuit, and to How the power supply works. Background technique [0002] With the development of mobile electronic devices, the requirements for the battery life of the devices are getting higher and higher, and the market has a strong demand for power system efficiency and self-power consumption. In some existing electronic devices, such as mobile power supplies or chargers, micro-control units are added to do some intelligent control. Since the power consumption of micro-control units is usually only tens of milliamps, and for cost considerations, micro-control units generally use Low-dropout linear regulator (LDO) power supply. Such as figure 1 As shown...

AI Technical Summary

Problems solved by technology

The conversion efficiency of the low dropout linear regulator is equal to the output voltage divided by the input voltage. When the input and output voltage difference is large, the low dropout linear regulator has the problem of low conversion efficiency.

Therefore, in the existing solutions, there is a problem of low conversion efficiency

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