When making the wireless charging transmitter coil, the wire should not be too thin, so as not to increase the resistance and reduce the Q value. If the wireless charging coil is used, the wire is too thin, its current carrying capacity and mechanical strength are small, and the wire is easily burned or broken. Therefore, in On the premise of ensuring the current carrying capacity and mechanical strength, appropriate conductor windings should be selected.
Before use, check whether the coil structure is firm, whether the turns are loose, whether the lead contacts are loose, whether the magnetic core rotates sensitively, whether there is a slider, etc. After these aspects are checked and qualified, the coil is charged before installing the equipment.
The device orientation of the wireless charging transmitter coil and the relative orientation of other components should comply with the planning regulations, otherwise the normal operation of the entire transmitter coil will be affected. For example, in a simple semiconductor radio, the direction of the high-frequency choke coil and magnetic antenna should be reasonable Arrangement; the coil and the vibrating coil should be directly connected to avoid the influence of mutual coupling.
Some coils need to be fine-tuned during the application process, and it is inconvenient to change the number of transmitting coils. Therefore, the fine-tuning method should be considered when selecting. For example, a single-layer coil can choose to remove the number of turns near the end point, that is, the coil can be wound at one end of the coil in advance. 34 turns. During fine-tuning, the inductance can be changed by moving its direction. Practice has proved that this tuning method can fine-tune the inductance by ±2 percent - ±3 percent. For coils used in short-wave and ultra-short-wave circuits, it is often Reserve half a circle for fine-tuning. Move or rotate the half-circle to change the inductance and complete the fine-tuning of the coil. The fine-tuning of the multi-layer segmented coil can be done by moving the relative spacing of one segment. The number of turns of the active segment is 20 percent of the total number of turns -30%. Practice has proved that this fine-tuning scale can reach 10%-15%. The coil with magnetic core can adjust the orientation of the magnetic core in the coil tube to complete the fine-tuning of the coil inductance. When the coil is in use, do not arbitrarily change the shape of the coil .The size of the coil and the distance between the coils, otherwise it will affect the original inductance of the coil. Especially the higher the frequency, the less the number of turns. Therefore, the high-frequency coils currently used in TVs generally use high-frequency coils. It is sealed and fixed with wax or other dielectric materials. In addition, it should be noted that during the maintenance process, do not arbitrarily change or adjust the position of the original coil to avoid detuning.
Ferrite cores are generally not used above 100MHz, and only air-core coils can be used for wireless charging transmitter coils; steel cores can be used for fine-tuning. In addition to inductance and rated current, the coils used in high-frequency circuit choke coils must also be paid attention to. Its distributed capacitance should not be too large.