A prompting circuit for the completion of charging of a wireless charger for a mobile phone

Abstract

The invention discloses a prompt circuit used when charging of a vehicle-mounted mobile phone wireless charger is completed. According to the circuit, after supplying power to a transmitting circuit, a main power source is connected to a transmitting coil, and after a receiving coil receives electromagnetic induction, the electromagnetic induction is transformed to supply power to a mobile phone through a receiving circuit. The prompt circuit is characterized in that meanwhile, the main power source also supplies power to a control circuit, and the control circuit is connected with a driving circuit to drive to the transmitting circuit; a sampling voltage of the transmitting coil is transmitted to a charge completing prompt circuit through a current detection circuit to be compared with a reference voltage of a voltage reference generating circuit, and the charge completing prompt circuit drives a buzzer to give a prompt. Due to the fact that the structure is adopted, the prompt circuit has the advantages that the corresponding prompt is given after loads are fully charged, the structure is simple, excessive production cost does not need to be increased, energy is saved, efficiency is improved, and electromagnetic wave pollution is reduced.

Description

technical field [0001] The invention relates to the application field of a vehicle-mounted wireless charger, in particular to a prompt circuit for the completion of charging of a vehicle-mounted mobile phone wireless charger. Background technique [0002] Wireless charging is a new charging technology that does not need to be connected by conductors or plugged in. It converts electrical energy into magnetic energy through an energy transmitter, and then converts the magnetic energy into electrical energy at the receiver to supply power to the load. This technology has been successfully applied in various electronic products. [0003] However, in the existing vehicle-mounted wireless charging device, the charging end (power transmitting end) for supplying power to the load is always in the working state, even when the load at the power receiving end is fully charged, the existing wireless charging device is still in the normal working state , its transmitting end still conti...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing vehicle-mounted wireless charging device, the charging end (power transmitting end) for supplying power to the load is always in the working state, even when the load at the power receiving end is fully charged, the existing wireless charging device is still in the normal working state , its transmitting end still continuously transmits electric energy to the outside

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