Power conversion device and electronic device comprising same

Abstract

A power conversion device and an electronic device comprising the same. The power conversion device comprises an input terminal configured to connect with a power source and receive an input voltage; an output terminal configured to connect with a load and provide an output voltage for the load; a first power conversion unit configured to convert the input voltage into the output voltage and stabilize the output voltage; a second power conversion unit configured to convert the input voltage into the output voltage and stabilize the output voltage, the second power conversion unit having a higher power conversion efficiency than the first power conversion unit when an output current provided for the load is higher than a first threshold value; and a power conversion unit selection unit configured to detect parameters corresponding to the output current and select the first power conversion unit and the second power conversion unit based on the parameters corresponding to the output current.

Description

technical field [0001] The invention relates to a power conversion device and electronic equipment including the power conversion device. Background technique [0002] In electronic devices such as mobile phones or tablet computers, various step-down power conversion devices are usually used to convert the voltage generated by the battery into the voltage required for the operation of the electronic device, and the battery is supplied to the Various components of electronic equipment are powered. [0003] Step-down power conversion devices used in electronic devices such as mobile phones or tablet computers generally include linear (Linear) power conversion devices and chopping (Buck) power conversion devices. When the load power requirement of the electronic equipment is high (for example, the screen is bright, or the program is running, etc.), thus requiring a large output current (that is, the load current), the Buck power conversion device usually has more power than th...

AI Technical Summary

Problems solved by technology

When the load power requirement of the electronic equipment is high (for example, the screen is bright, or the program is running, etc.), thus requiring a large output current (that is, the load current), the Buck power conversion device usually has more power than the Linear power conversion device. High power conversion efficiency, while the power conversion efficiency of Buck power conversion device is lower than that of Linear power conversion device when the load power demand of electronic equipment is low (for example, standby) and thus requires a small output current

In most of the current electronic equipment, the Buck power conversion circuit is usually used as the power conversion device of the electronic equipment for the power supply of the large load. However, when the power supply of the load of the electronic equipment is low, the performance of the Buck power conversion circuit is not ideal.

It is also possible to enter the Buck circuit into PFM mode at light load to reduce the loss of the Buck circuit itself during standby, but this mode of operation often brings negative effects such as excessive ripple and audio noise.

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