Resonant wireless power supply system and synchronous rectification circuit thereof

Abstract

The invention discloses a resonant wireless power supply system and a synchronous rectification circuit thereof. The resonant wireless power supply system comprises a resonant ring, a rechargeable battery, a synchronous sampling inductance coil, a comparator, a reference power supply, a driving module and a controllable switch, wherein a first end of the synchronous sampling inductance coil is grounded, a second end of the synchronous sampling inductance coil is connected with a first input end of the comparator, a second end of the comparator is connected with the reference power supply, an output end of the comparator is connected with an input end of the driving module, an output end of the driving module is connected with a control end of the controllable switch, a first end of the controllable switch is connected with a first end of the resonant ring, and a second end of the controllable switch is grounded; a second end of the resonant ring is connected with a positive electrode of the rechargeable battery, and a negative electrode of the rechargeable battery is grounded; the controllable switch is turned on when voltage of the first input end is greater than voltage of the second input end of the comparator; and the synchronous sampling inductance coil and a receiving inductance coil are overlapped in structure and identical in winding direction. The rectification for sine waves is achieved according to the invention.

Description

technical field [0001] The present invention relates to the technical field of wireless charging, in particular to a resonant wireless power supply system and its synchronous rectification circuit Background technique [0002] With the current development of wireless power supply technology, this technology has become the focus of application in the field of charging. The resonant wireless power supply system is a typical application of wireless power supply technology in the charging field. The resonant wireless power supply system usually uses a diode rectifier circuit for rectification. Since the resonant wireless power supply system does not have a high-speed feedback mechanism like a switching power supply, The voltage at both ends of the receiving coil will be very large at no load. When a diode rectification circuit is used for rectification, the diode in the diode rectification circuit cannot use a low-voltage high-speed diode, and a high-voltage diode is required. ...

AI Technical Summary

Problems solved by technology

However, the synchronous rectification circuit in the prior art is mainly used in switching power supply systems, and mainly rectifies the square wave signal, while in practical applications, the receiving end signal of the resonant wireless power supply system is a sine wave signal, and the existing synchronous rectification The circuit cannot effectively rectify the sine wave signal

Images