1, does the question want to ask "How many Hertz is the wireless charging frequency of mobile phones in Germany"? 100~145kHz, 6765~6795kHz, 13553~13567kHz. The use frequency of mobile and portable wireless charging equipment is 100~145kHz, 6765~6795kHz, 13553~13567kHzThe rated transmission power is required to be less than 50W.
2, wireless charging, using the principle of electromagnetic induction, the working frequency is very low, and the risk is small. If you're still worried, you can choose and defend your plan.
3, w. At present, domestic mobile phones have supported 50W wireless charging, 50W is also the upper limit of the provisional wireless charging standard, but even so the frequency of wireless charger is still not as good as the traditional charger, Samsung launched 15W wireless charger at this time, it is confusing.
4, the current wireless charging Alliance (WPC) formulated Qi standardCharging frequency is generally about 100kHz, it is recommended to take a look at this standard, it is the current more mainstream standard in wireless charging.
5, the relevant standards for wireless charging have not yet been introduced, and according to the specification documents of the wireless charging Alliance, the working frequency of wireless charging products is set in the range of 50HZ 60HZ, theoretically its electromagnetic radiation level and ordinary small household appliances are equivalent. This standard is lower than the electromagnetic field exposure limits for products exposed to the public issued by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), which are currently approved by expert committees in more than 35 countriesWireless charging frequency , output power: 5 volt -1 amp, charging current: 1000 mA, input power: 2 watts, transmission distance: 5-8 milli, efficiency conversion: 75%.
2, support wireless charging, Apple Watch uses sapphire screen, two screen sizes. Support phone, voice back text message, car connection, weather, flight information, map navigation, play music, heartbeat measurement, step counting and other dozens of functions, is a health and sports tracking device. Apple Watch usage NoneLine charge operating frequency is MagSafe type wireless charge operating frequency wireless charger. It magnetically attaches to the back of the Apple Watch and is then charged inductive. 3, can be placed on the magnetic charger overnight charging, because the iwatch charging input is not high, after full to maintain about 0.01a, the battery will stop charging, standby, if you open the bedside clock mode, there will be a night charge is not necessarily 100% phenomenon.
4. iWatch uses magnetismThe power wireless charger has no Lightning charging port as a whole and cannot be charged directly with a data cable.
1, the current wireless charging alliance (WPC) developed the Qi standard of the charging frequency is generally about 100kHz, it is recommended to look at this standard, it is the current more mainstream standard in wireless charging.
2, does the question want to ask "How many Hertz is the wireless charging frequency of mobile phones in Germany"? 100~145kHz,6765~6795kHz, 13553~13567kHz. The use frequency of mobile and portable wireless charging equipment is 100~145kHz, 6765~6795kHz, 13553~13567kHz, and the rated transmission power is required to be less than 50W.
3, the relevant standards for wireless charging have not yet been introduced, and according to the specification documents of the wireless charging Alliance, the working frequency of wireless charging products is set in the range of 50HZ 60HZ, theoretically its electromagnetic radiation level and ordinary small appliances are equivalent, and this standard is lower than international AfricaThe Commission on Ionizing Radiation Protection (ICNIRP) has issued electromagnetic field exposure limits for products exposed to the public, which have been reviewed and approved by expert committees in more than 35 countries.
Wireless charger operating frequency Wireless charger operating frequency , according to QI standard is 110-205kHz; Mobile phone communication wireless charge operating frequency frequency is 0.8GHz to 2GHz range (different communication systems will vary, 1GHz=10^9Hz).
Taking 1000mAh capacity lithium battery as an example, the radiation of wireless charger is calculated. 50% charging capacity is about 7~8Wh. If it is required to be full for about two hours, the maximum charging power should reach at least 1W (the maximum power of the GSM900 mobile phone is about 2W); Since the wireless charging method of the phone is to place the phone above the charger rather than inside, the radiation leakage rate can be not small.
According to the Electromagnetic Radiation Protection Regulations, the general user is 24 hours a dayWithin 6 minutes, the average radiation absorption radiation rate of the whole body should be less than 0.02 w/kg. However, there are no specific standards for wireless charging. Experts say that while there are national standards for traditional mobile phone chargers, there should be national industry standards for emerging wireless charging devices as soon as possible. The Qi wireless charging standard uses a low frequency non-ionization frequency (110-205khz) that is harmless to the human body.
The test found that using a high-sensitivity radiation tester, the wireless charger's radiation value was between 150 and 180, although compared to 250 to 627 in front of a computer screen or when making a phone callThe number of thousands is small, but the cumulative effect may not be negligible. At the same time, when wireless chargers, mobile phones, computers and other electronic devices are used together, the radiation value will increase significantly.
First of all, not all wireless chargers on the market can be competent for watch charging. Many products do not clearly label the radiation value, which is somewhat worrisome. Because the radiation standard of wireless charging technology has not yet been perfected, we need to be concerned that the current regulatory requirements, such as the "Electromagnetic radiation Protection Regulations" stipulate that the electromagnetic radiation of the user in continuous contact with the wireless charger within 24 hours shall not exceed the specific absorption rate of 0.02W/kg(SAR) restriction.
According to the Regulations on Electromagnetic Radiation Protection, the average specific absorptibility (SAR) of the whole body of ordinary users should be less than 0.02W/kg for any consecutive 6 minutes within 1 day and 24 hours. "But it's a very simple standard, and it's not clear what the product will be." China Communication Standardization Association standard information service department Ms. Zhao said.
1, wireless charging, even remote sensing charging. Its principle is electromagnetic induction, which is usually used in small power situations and does not require electrode contact points. There are induction coils in the small column and electricity, there are induction coils in the electric toothbrush insertion part, and there are plastic insulation outside, there is no electrical contact, and the induction obtains electricity to charge the battery and drive the small motor.
2, wireless charging principle -- electromagnetic induction wireless charging Electromagnetic induction wireless charging is the most used wireless charging solution, high school physics textbooks have been mentioned through the beginningA certain frequency of alternating current is generated in the secondary coil by electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
3, the basic principle of wireless charging is to convert the current into a magnetic field, and the magnetic field is transmitted through the air and then converted into a current to be transmitted to the intelligent terminal. 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. After passing through the power management module, the output direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.
Generally not. Wireless charger Wireless charging frequency The principle is electromagnetic induction, the charger generates a magnetic field through the current, the mobile phone generates current through the magnetic field induction, so as to charge the mobile phone, the international standard is Qi charging, Apple mobile phone also supports Apple's MagSafe wireless charging. The most important thing that affects the battery life is the charge and discharge cycle of the mobile phone battery, that is, the process of the mobile phone from no electricity to full, and then from no electricity to full.
No, wireless charging does not degrade the battery's performance any faster. The battery manufacturer's design of the amount of energy stored in the battery determines the wireless charge operating frequency how much power we can use. The manufacturer sets a fixed upper cut-off voltage and lower cut-off voltage, and realizes electrical cycling between the two voltage ranges, as long as wireless charge operating frequency we choose the right voltage range, we can let the battery cycle thousands of times.
Protection interface: Wired charging requires frequent insertion and removal of the charging cable, long-term useThe interface may be damaged or worn. Wireless charging eliminates this problem, and the phone interface can remain in good condition for a longer time, extending the service life of the phone. Low charging efficiency: Compared with wired charging, wireless charging is less efficient. That means it takes longer for users to fully charge.