1, "RF input interface", that is, commonly known as "cable TV interface". This interface can receive TV programs provided by local cable TV operators by connecting the cable line of sight, and this interface is also the connection method used by the earliest broadcasting equipment, "recording (playing) video machine". RF RF terminals are the first to appear on television, the original meaning of radio frequency (Radio Frequency).
2, RF is the radio frequency input socket, that is, the position of the antenna. AV input is also the audio and video signal input socket, connected to the set-top box, DVD player, video recorder or computer and other audio and video signals through the TV. AV output is the audio and video signal output socket, used to connect the video recorder to record TV programs, or connect the power amplifier to play through the speaker. Now there are HD interface, as well as video color difference interface, network cable interface, digital coaxial interface and so on.
3, RF input is the input interface of RF signal, can access high-frequency audio and videoSignals, including cable television (the kind of signal that does not use a set-top box) signal transmission signals, as well as signal lines from outdoor TV antennas and radio frequency signals from other audio and video equipment.
4, RF input interface usually refers to the RF input interface, used to connect the RF signal source to the device, such as TV, radio, tuner, etc. The RF input interfaces can be various types of connectors, common ones include: **Coaxial Cable Connector ** : One of the common RF input interfaces is a coaxial cable connector, for exampleF type, BNC type and SMA type.
5, RF is the radio frequency (radio wave) input port, used for external antennas or analog cable TV signals transmitted by coaxial cable, this signal is tuned (select station) amplification processing, and finally into video signals and sound signals, and then in the TV "video channel" and "audio channel" further processing, Finally, the picture is played on the screen and the sound is played through the speaker.
1, rf power supply working principle RF power supply, that is, radio frequency power supplyIs a power source used to generate radio frequency signals. Its working principle is through a linear circuit composed of transformers, rectifiers, voltage regulating circuits and other circuits, the DC power supply is converted to AC power supply, and then through the oscillation circuit to generate RF signals. The oscillation circuit can be LC oscillation circuit, can also be RC oscillation circuit and so on.
2, the principle of RF power supply is to convert the low-frequency power supply into high-frequency electric energy, and generate high-frequency electric or magnetic fields through the action of electromagnetic fields. Rf power is a kind of power supply used to generate high-frequency electric or magnetic fields, which is widely used in wireless communication, medical equipment, industrial heating and other fields.
3, signal source: First, the signal source generates the data that needs to be transmitted, which can be voice, video, text or other forms of information. Modulation: The signal source then modulates the data signal onto the RF carrier. Modulation is a process by which a data signal is converted into a change in amplitude, frequency, or phase of an RF signal. Amplification: The modulated RF signal is usually weak and needs to be enhanced by an RF amplifier.
4, the active electronic tag is equipped with a battery, generally with a far reading distance, the shortage is that the battery life is limited (3 to 10 years); There is no battery in the passive electronic tag, and after receiving the microwave signal from the reader (readout device), it converts part of the microwave energy into direct current for its own work, which can generally be maintenance-free.
5, the matcher is according to the change of the user load and adjust their own parameters (inductance and capacitance) to achieve the purpose of impedance matching, in order to reduce the purpose of reflection! Rf power matcher design application QQ group 128657795 There are very few people in this industry, usually there is no place to exchange, no one to participate in the discussion when encountering problems, brother invited to join the elite of RF power and matcher industryWireless charging enables wireless charging of small battery-powered devices (such as IoT devices, wireless headphones, smart watches, smart bracelets, etc.) without the need to redesign the charging unit separately.
2, such a low charging power want to charge the mobile phone must be wait until the monkey horse, after all, NFC is not designed for charging, so this wireless charging scheme is more to low-power IoT devices, such as smart watches, fitness trackers, wireless headphones, digital pens and other consumer devices. It doesn't make much sense for high-consumption electronic devices like phones or pads.
3, the purpose of WLC is to use the increasing popularity of NFC because of mobile payments as a carrier, so that some small power devices can use a simple wireless charging standard, so that it simplifies the electronic contact, the design of more concise, more sealed Internet of Things devices.
4, I think that NFC support wireless fast charge on the mobile phone is more likely to affect the mobile phone integration NFC module, in the future, there are more supporting devices can achieve charging life through the mobile phone, greatly enrich the application scenario of the mobile phone.
5, / And in today's Internet of everything, for low-power iot devices, NFC is notLine charging solution is to solve the pain point of low power, such as smart watches, wireless headphones and other wearable devices charging needs have been optimized. The NFC wireless charging solution provided by ST is not only complete and compliant with the specifications of the NFC Forum, but also provides an ideal choice for the power supply of ultra-miniaturized devices.
Wireless charger usage method: Connect the phone's standard charger and data cable to the wireless charger, and then put the phone directly (vertically) or horizontally on the left of the wireless charger baseThe right center position can realize wireless charging, the indicator light will have a breathing effect, and it will be extinguished after 5 seconds, plug and play, convenient and quick.
You can use a wireless charger to charge an iPhone by placing two phones close together and placing the back of one phone close to the back of the other phone. Expanding your knowledge: The iPhone is a line of mobile phones powered by Apple Inc. 's iOS operating system that went on sale on Jan. 9, 2007.
If your Huawei mobile phone supports wireless charging, the wireless charger directly supplies powerCharge the phone by placing the screen facing up in the center of the charger or as suggested by the manufacturer.
Electromagnetic induction charging technology: This wireless charging technology realizes energy transmission through electromagnetic induction principle. A certain distance should be maintained between the charging base and the charging device. Usually, the charging device needs to be placed on the charging base for charging. This technology has high charging efficiency and is suitable for small electronic products such as mobile devices.
There are four basic principles of wireless charging, respectivelyElectromagnetic induction charging, magnetic field resonance charging, radio wave charging, electric field coupling charging, the mainstream standards on the market are mainly Qi standard, PMA standard, A4WP standard, iNPOFi technology and Wi-Po technology. Let's take a look at the principle of wireless charging.
At present, there are four main wireless charging methods: electromagnetic induction charging, magnetic field resonance charging, radio wave charging, electric field coupling, and the technical solutions of various charging methods are not the same. Electromagnetic induction wireless charging is the use of the power supply (wireless charging board) and the power receiver (mobile phone) on the senseAccording to the induced magnetic flux generated between the magnets, the magnetic force is converted into electricity and then transmitted.
At present, there are four main technical ways to achieve wireless charging: magnetic induction technology, magnetic resonance technology, microwave technology and electric field coupling technology. Among them, magnetic induction technology and magnetic resonance technology are the technologies that are basically used in the current mass production products.