1, when charging the mobile phone, the charger will first turn 220V AC through the rectifier circuit into high voltage direct current, and then through the switch tube into high frequency high voltage pulse, and then through the transformer into low voltage pulse, the specific value of the low voltage depends on the voltage required by the charging device. Finally, the low-voltage pulse passes through the rectifier and voltage regulator circuit to become the corresponding direct current.
2, for the charging effect of direct charge, but also look at the mobile phone, because the charging control circuit on the mobile phone, its cut-off voltage has a certain dispersion, I actually measuredThe amount of the same batch of the same model of mobile phones is basically between 09V and 21V. That is to say, if 09V is cut off, it is not full, not the ideal capacity, and then continue to fill for a period of time may be more full.
3, therefore, it is necessary to add a power protocol chip on the product, so that it can communicate with the charger. Working principle: The working motherboard sends a signal to the XSP01 protocol IC, for example, 9V is needed now, then XSP01 will communicate with the charger, telling it, I need to request 9V now, the charger will make corresponding adjustments, output 9V, complete.
4. Power storageThe cell receives electrical energy from the external circuit and converts it into the chemical energy of the battery. After the battery energy is consumed by discharge, it can be restored by charging, and it can be re-discharged to form a charge discharge cycle. Generally charged with DC current (also useful asymmetric AC current or pulse current). In different cases, different charging methods are used, such as constant current charging, constant voltage charging, floating charging, trickle charging, rapid charging or the combination of these methods. 5, although lithium-ion batteries rarely have the memory effect of nickel-cadmium batteries, the principle of memory effect is crystallization, and this reaction is almost not produced in lithium batteries. But, lithium ionThe battery capacity will still decrease after multiple charging and discharging, and the reasons are complex and diverse. 6, a comprehensive introduction to the principle of mobile phone charger All mobile phone chargers are actually composed of a stable power supply (mainly a voltage regulator power supply, providing stable operating voltage and enough current) plus the necessary constant current, voltage limit, time limit and other control circuits. The output parameters marked on the original charger (wire charge) : for example, output 4. 4V/1A, output 9V/400mA...... It refers to the relevant parameters of the internal regulated power supply.
The principle of walkie-talkie is the principle of radio. The working principle of the walkie-talkie is as follows: The transmission part: the phase-locked loop and voltage controlled oscillator (VCO) generate the transmitted RF carrier signal, which is buffered and amplified, excited and amplified, and the power amplifier generates the rated RF power, passes the antenna low-pass filter, inhibits the harmonic component, and then is transmitted out through the antenna.
transmitter: converts the electrical signal output by the transducer into high-frequency electrical oscillation with sufficient strength. (3) Antenna: the high-frequency electrical oscillation into electromagnetic waves to the transmission medium radiation.
The fork spring switch will be switched after the extension is off the hookNow we're ready for the intercom. Then the resident confirms with the downstairs, press a micro switch on the extension, the downstairs door machine gets power, and forwards the signal to the electromagnetic or electronic lock of the unit door, and then the unit door is unlocked. This is non-visual. Visual works the same way, but with a 75-5 or 75-3 video cable.
The principle is not the same, walkie-talkies are transmitted directly through radio waves at close range, and mobile phones are transmitted through the relay base station to increase the radio waves you send and receive radio waves from others, and can be transferred to each other for long-distance transmission.
Walkie-talkies rely on radio waves to transmit signals, just like the radio, do not need a signal tower and satellite transfer, but the frequency band of the walkie-talkie is relatively low, affected by distance, if you want to increase the distance intercom, you need a relay station to achieve; A walkie-talkie is divided into two parts: transmitting and receiving.
Walkie-talkie introduction Walkie-talkie is a two-way mobile communication tool, in the case of no network support, you can make calls, no phone charges, suitable for relatively fixed and frequent calls, such as traffic management, security docking and so on. There are three categories of walkie-talkies: analog walkie-talkies'> Now that wireless charging technology has been available, the wire may not be eliminated in the future
1. No. Thirty years is too short, and even if the technology does mature, China will not be able to replace cable transmission lines quickly enough. You see, even though construction began after the founding of the People's Republic, some western areas still have no power lines and rely on oil lamps. Moreover, the technology is unlikely to be implemented. The problem with wireless transmission is that the closer you get to the source, the stronger the signal. Well, then a family needs a receiver.
2, you may think, cancel the cable interface, how is this possible? Well, then my phone's dead,What if you want to PLAY? Don't worry, wireless charger and mobile phone with a magnetic field to transmit energy, generally around 0.9-2 meters can be charged, and high-power wireless charging transmission distance can be up to 5 meters. 3, I think that by 2020 wireless charging technology will begin to appear a wide range of applications, by 2030 should be able to share the market with wired charging, but the future will not completely replace wired charging, the two still coexist. Of course wireless charging is a technology, not just in electric cars, but in the future our lives may include homesAppliances, mobile phones and so on will be promoted.
4, these wires and cables can be eliminated in the future, and now the company and the market are time to take this step. Wireless charging technology is here, and while I'm not sure what the pros and cons of this technology are, most people are ignoring this huge opportunity. Online media aggregation: It's no secret that many traditional and new media companies are struggling to turn online attention into profit.
1, [TaipingNew Magotan center control has a charging area Wireless charging principle , the mobile phone is placed in the charging area below the center control, you can easily charge. New Magotan front face family style design language is highly recognizable, vertical chrome decorative bar, looks more exquisite wireless filling principle ; The LED headlights have also been adjusted, and the new X-type bumper design is more dynamic. The side lines of the body are smooth and look very slim.
2, the new Magotan center console is equipped with wirelessCharging principle A dedicated wireless charging area. Simply place the phone gently in the area, you can achieve convenient wireless charging function, without complicated plugging steps. The new Magotan uses the family language in the exterior design, the adjustment of vertical chrome decorative strips and LED headlights to make the front face more recognizable. The side lines of the body are elegant and smooth, showing a slender beauty.
3. First, connect the interface of the mobile phone sticker in the bracket component to the charging interface of the mobile phone, and then put the mobile phone on the bracket, and adjust the position and convenient viewing Angle. This way, the phone can start chargingIt's electric. Car phone wireless charger is a device that can be used in the car or at home, suitable for all smart phones, no matter what brand of mobile phone, as long as it is a smart phone, wireless charging can be achieved.
4, the new Magotan mobile phone wireless charging function is very convenient and practical. You can easily charge your phone by simply placing it in the charging area above the center console. In addition, the front of the new Magtan adopts a family-style design, and the adjustment of the vertical chrome trim strip and the LED headlights make it look more sophisticated and dynamic. The side lines of the body are smooth, and the tail letter decoration and the increase of high-end atmosphere also make it more attractiveAttractive.
5, if you encounter charging problems, first try to restart the phone and check whether the phone system is running normally. Voltage instability may affect the charging efficiency. In this case, you can try to replace the wireless charger or reinsert the phone cable. If it is because the charger plug is not tightly inserted, just re-plug it to solve the problem.
1, wired walkie-talkie electromagnetic interference principle is through direct coupling or indirect coupling, into the wireless communication equipment of electromagnetic waves, it is directly onThe reception of useful signals has an impact on its performance, signal quality deteriorates, communication is blocked, and the transmitted data is even lost when the error increases. Walkie-talkie, in the case of no need for any network support, you can talk, no call charges, suitable for relatively fixed and frequent calls.
2, because the odd harmonics of the switching power supply are radiated and the power line interferes with the outside, thus forming mutual interference with the walkie-talkie, causing the quality of the walkie-talkie to deteriorate, affecting the normal operation of the switching power supply or even directly damaged. When the use of walkie-talkies is prohibited or the use of walkie-talkies will cause interference or dangerIn case of emergency, please do not turn on the machine. All walkie-talkies may be interfered with by other signal elements outside, thus affecting the communication effect.
3, the working principle of the walkie-talkie is the use of radio signals for communication, sending and receiving signals will produce a certain electromagnetic radiation. This electromagnetic radiation may interfere with the normal operation of household appliances, resulting in electrical faults, noise, signal loss and other problems.
4, not very good positive answer you interference is where, because when you open the walkie-talkie, the noise to the lowest you will find that in fact each frequency is interfered with, some of these interferences are groundElectromagnetic waves from the ball itself, sky waves from space, and the influence of nearby electronic devices. If the noise is to the maximum or there is interference, it can only indicate that the interference on the current frequency is relatively large, affecting the normal use.
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