Wireless charging of electric toothbrushes usually uses electromagnetic induction technology, which requires a coil to be placed between the electric toothbrush and the charging base. Here are some basic steps to make a wireless charging coil for an electric toothbrush:
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1, coil parameters: First of all, you need to understand the charging power and working voltage of the electric toothbrush, in order to determine the parameters of the coil, such as:
Power input: 220V AC 50Hz
Output voltage: 5V DC
Maximum output current: 200mA
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The parameters of the coil should be:
Inductance: 18uH
Resistance: 200mohm
DC Resistance: 2 ohm
Resonant Frequency: 254kHz
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2, make coils: use insulated copper wire and control cable and other materials to wind the coil into a circle, the number of winding and wire diameter to match the electric toothbrush and charging base of the coil. The upper and lower ends of the coil should be welded to the cable and the relay, the relay is connected to the power supply and the output end.
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3, testing and debugging: After the completion of the coil production, you need to use oscilloscope and other test tools to test and debug the coil to ensure that its resonance frequency and output power meet the requirements.
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4. Installation and use: After testing and debugging, install the coil between the electric toothbrush and the charging base to realize wireless charging function.
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It should be noted that because the fixing and positioning of the electric toothbrush coil is more important, it needs to be adjusted and optimized according to the actual situation when making and installing. At the same time, in order to ensure the reliability and safety of the charging coil, it is recommended that you follow the relevant safety standards and specifications when making and using.