The working principle of the electric toothbrush: the positive charge is accumulated on one metal rod of the battery, and the negative charge is accumulated on the other metal rod. This metal rod is called "electrode". This potential difference causes the electric toothbrush coil in the motor to generate current or voltage. Transistor oscillation. The rotational kinetic energy of the motor is converted into the kinetic energy of forward and backward motion, so that the brush head of the electric toothbrush can continuously vibrate between the upper and lower teeth.
Electric toothbrush coilApplication in electric toothbrush work:The basic principle of wireless power transmission is to introduce the current of the AC power supply into the transmitting coil, induce a periodically changing magnetic field around the electric toothbrush coil, and then induce a periodically changing electric field (voltage) in the receiving coil to form a current.
The quality factor of the electric toothbrush coil represents the loss of the coil. The quality factor also varies with the application. Usually, the quality factor of the high-frequency coil is 100 to 300. When the electric toothbrush coil is wound, the winding tension is controlled to ensure the coil The winding will not be too loose or too tight, which will elongate the enameled wire and reduce the insulation voltage. In fact, the parameters of the electric toothbrush coil are very important, because its size may also affect the selectivity, efficiency, and filtering characteristics of the loop and frequency stability. Therefore, it is necessary to find ways to improve the quality factor of the electric toothbrush coil, which is beneficial to its performance.
However, wireless transmission still has problems such as large transmission loss and low conversion efficiency. Broadly speaking, the most commonly used wireless transmission modules are induction cookers, other mobile phone transmissions, etc. At present, it is necessary to add a magnetic separator to the product for magnetic conduction in wireless charging. In order to Improve the efficiency of wireless charging and reduce heat during charging. The current charging efficiency is generally between 75% and 80%. Now wireless charging technology is becoming more and more mature, but it is becoming more and more popular in China.