Wireless Charging Sonic Electric Toothbrushes
WAS-1972EN V1.00
1 / 17
December 27, 2021
Wireless Charging Sonic Electric Toothbrushes
D/N: WAS-1972EN
Introduction
Wireless charging sonic electric toothbrushes are divided into two parts, a wireless charging
transmitter or charging base and a sonic electric toothbrush or toothbrush body. The charging base
mainly includes two functions, wireless charging transmission and ID identification. The toothbrush
body includes four functions, wireless charging reception, lithium battery charging/discharging
management, sonic motor control and LED indicators. The charging base is powered by a 5V USB
interface and provides power to the toothbrush body through LC resonance, which provides a one-
way communication function, so that the charging base can receive information and identify ID
information returned by the toothbrush body. The toothbrush body not only provides charging
management and LED capacity display functions during the charging process, but also controls the
sonic motor to execute the corresponding brushing mode according to the different setup operations.
The Holtek dedicated wireless charging MCU provides the required control signals mentioned
above. This application note will first introduce the operating principles of wireless charging and
then explain each function control process step by step. It allows users to have an increased
understanding of Holtek's wireless charging device.
Figure 1. System Block Diagram
Application Areas
Wireless charging sonic electric toothbrushes, wireless charging maglev razors.
