A wireless charging receiving circuit, chip and wireless charging receiver

Abstract

Embodiments of the present invention relate to a wireless charging receiving circuit, a chip, and a wireless charging receiver. The wireless charging receiving circuit includes a first bridge arm unit, a second bridge arm unit, a first voltage conversion unit, a second voltage conversion unit, and a filter circuit , a bias power supply circuit and a control unit, one end of the first bridge arm unit and one end of the second voltage conversion unit are connected to the first node, and one end of the second bridge arm unit and one end of the first voltage conversion unit are connected to the first node. Two nodes, the other end of the first bridge arm unit, the other end of the second bridge arm unit, the other end of the first voltage conversion unit and the other end of the second voltage conversion unit are all connected to the common ground node, and the control unit is used for according to The on or off of each switch tube is controlled, so that the voltage output terminals of the first voltage conversion unit and the second voltage conversion unit output voltage signals. In the above manner, the size of the integrated circuit device and the integration cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a wireless charging receiving circuit, a chip and a wireless charging receiver. Background technique [0002] Currently, using wireless charging to power batteries is becoming more and more popular in smartphones. Since the energy transmitted by the wireless charging transmitter is transmitted in the form of a magnetic field, a wireless charging receiver must be used to convert the magnetic field energy into electrical energy. To achieve high efficiency, the coil operating voltage of the wireless charging receiver can be as high as 20 volts to reduce the resistive power dissipation in the receiver coil. However, the maximum operating voltage of a single battery is less than 5V, and in order to minimize the power loss during battery charging, efficient DC / DC conversion is required to reduce the output voltage of the wireless charging receiver to 5V or lower. Charge-pum...

AI Technical Summary

Problems solved by technology

exist figure 1 , although both the wireless charging receiver and the high-voltage charge pump are integrated, since the two devices operate completely independently, this integration requires filtering at the output of the synchronous rectifiers (Q1 to Q4) and the output of the main LDO (Q5), and From the coil to VOUT, there are five to six power switching devices connected in series to convert the received AC power to DC power, so an additional filter capacitor (C RECT ,C PMID ), and more power switches are used, resulting in the need for large-scale integrated circuit devices and higher integration costs

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