1, a variety of external interference, processing industry and weather interference, etc., the impact on the modulated wave is mainly manifested as parasitic amplitude modulation, the formation of noise. The frequency modulation system can eliminate the parasitic amplitude modulation caused by interference by the method of limiting amplitude. The amplitude of the amplitude-modulated signal in the AM system is changed, so the limiting can not be usedIt is difficult to eliminate external interference. In addition, the larger the signal-to-noise ratio of the signal, the stronger the anti-interference ability.
2, the four variable capacitor to the maximum capacity, that is, to accept the lowest frequency (535KHz), adjust the magnetic core of the intermediate frequency transformer B2, so that the radio can receive the signal source output 535KHz amplitude modulation signal, and then move the coil position on the magnetic bar, so that the sound is the largest, wax sealed.
3, the input signal of the mixing circuit is two high-frequency signals, the output IF signal is the difference between two high-frequency signals, the filter is a bandpass filter; The input signal of the amplitude-modulation circuitMany, such as mobile phones can now realize wireless charging.
2, the use method is as follows: After plugging in the power supply, touch the curved light pole with your finger at any position to light the light. Put the device that needs to be charged under the lamp, switch the mobile phone to the wireless charging mode, and put it into the wireless charging induction area of the lamp. Use the phone charging cable to connect the lamp USB port to the phone, and the phone can also be charged.
3, very simple, regular discharge. For example, every month (if there has been no power failure), do not plug in the AC plug, turn on the light, until the light is not bright, indicating that the electricity has been discharged. Plug in the AC power.
4, wireless charging, the desktop has never been so clean. The touch design is adopted, and the three touch buttons below are the light switch key, the on key and the timed shutdown key in turn. At the same time, this is also the wireless charging area, if your mobile phone supports wireless charging, it can be directly put up to charge the mobile phone, say goodbye to the bondage of the data line, the desktop is suddenly clean. Oh, and you can charge it wirelessly without turning on the lamp.
5, How to use Huawei wireless charging lamp? In addition to being able to turn on and off by touch, there are more detailed adjustment functions on its panel, which can be stepless with a finger swipeAdjusting the brightness of the light, the experience is exactly the same as adjusting the brightness of the mobile phone, and because this operation does not involve mechanical movement, there will never be wear and aging, no matter how long the experience is the same.
1, What are the components of wireless charging? The left side is TX, that is, the transmitter, and the corresponding product is the wireless charging transmitter. On the right is Rx, that is, the receiving end, and the corresponding product is a mobile phone with wireless charging function.TX end: MCU, power full bridge, and LC resonant Tank composed of inductors and capacitors, where the inductor is the transmitting end coil.
2, this circuit diagram with chip sl1052 as control, simple structure, complete functions. Pin function 1 Power end. 2 Temperature monitoring input. 3 Charging status indicator. 4 Grounding terminal. 5 Adjust the tube driver. With the base of the external regulating tube. 6 Charging control. 7 Current sampling input. The charging current is determined by the voltage difference between the power supply and this pin.
3, mobile phone wireless charging system mainly uses electromagnetic senseAccording to the principle of energy coupling through the coil to achieve energy transfer. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. Wireless charging technology is a special way of power supply, it does not need the power line, rely on electromagnetic wave propagation, and then the electromagnetic wave energy into electricity, and finally achieve wireless charging.
4, the disadvantages of wireless charging efficiency is slightly lower: the general charger also has a transformer, but the wireless charging transformer composed of the transmitting coil and the receiving coil is limited in structure, and the energy transmission efficiency is theoretically slightly lower than oneGeneral charger. Slow charging speed: Due to the current mobile phone and other receiving devices, most limit the input power, so the charging speed is slow.