Soft switch voltage converting circuit and user terminal

Abstract

An embodiment of the invention provides a soft switch voltage converting circuit which comprises a first inductor, a resonant capacitor, n switch bridge arms, n resonant inductors and a control circuit. The second end of the first inductor is connected with the first end of the resonant capacitor. The second end of the resonant inductor is grounded. The switch bridge arm comprises an upper switchtube and a lower switch tube. The drain electrode of the upper switch tube is connected with the first end of the resonant capacitor. The source electrode of the upper switch tube is connected with the drain electrode of the lower switch tube. The source electrode of the upper switch tube is grounded. The first end of each resonant inductor is electrically connected with the middle point of one switch bridge arm. The second end of the n resonant inductors are connected. The control circuit is electrically connected with the gate electrode of each upper switch tube and the gate electrode of each lower switch tube, and is used for generating n pairs of control signals for switching on or switching off the upper switch tube and the lower switch tube. Furthermore the embodiment provides a userterminal. The soft switch voltage converting circuit can improve conversion efficiency.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a soft-switching voltage conversion circuit and a user terminal using the soft-switching voltage conversion circuit. Background technique [0002] With the development of mobile communication technology, mobile phones have entered the era of smart phones from the era of feature phones, with more and more functions, and the power consumption is also increasing rapidly. In order to ensure a good battery life, the battery capacity has become larger and larger. Mobile phones with a battery capacity of 5000mAh already exist on the market, and the low-current charging technology in the feature phone era can no longer meet the charging needs of large-capacity batteries in smartphones. In the era of feature phones, the charging current is generally 500mA. If you charge a 5000mAh battery, the charging time will exceed 10 hours. At present, in the mobile phones with fast char...

AI Technical Summary

Problems solved by technology

However, most of the closed-loop step-down circuits built in existing mobile phones are traditional hard-switch closed-loop step-down circuits. When the switch tube is turned on or off, the voltage at both ends of the switch bridge arm is not zero. When the switching frequency increases When , there are serious switching losses, which is not conducive to improving the voltage conversion efficiency

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