1, overtemperature protection: automatically disconnected when the temperature is too high to ensure internal safety. Inrush current control: Soft start protects the system from heavy loads. Current limiting function: Keep the load current stable to avoid system crash. Reverse protection: prevent the reverse flow of the power supply and protect the multi-power system. Overvoltage protection: prevents electricityHigh pressure may damage the device.
2, switch: control circuit or load on and off. Load: The conversion of electrical energy into other forms of energy. The three states of the circuit are open (off) : the circuit is disconnected, and no current flows through the circuit. This state is divided into two cases, one is to use a switch to disconnect the normal open circuit of the circuit, the other is a fault state, from the conductor to break (switch in the closing position). Path: A connected circuit through which a load current flows.
3, electrical knowledge has circuit, power supply, load, the basic concept of current, the basic nature of voltage, etc. The circuit through which current passesIt was first shown on April Fool's Day 20 years ago, and later proved to be not a joke, but an actual research and development project.
On October 29, Xiaomi officially launched the space charging technology, leading everyone to enter the true wireless era in advance. Through the air separation charging pile, 5W charging can be achieved in several meters. Not only can multiple devices be charged, but also can be charged while playing, and foreign bodies are not affected. Millet space charging technology basically meets all the needs of Qi Ji for wireless charging. However, there are rumors that OPPO may show off the wireless charging technology they revealed in a 2020 April Fool's joke.Although it was seen as an April Fool's Day gimmick at the time, the OPPO flash charging team apparently worked on it in depth. According to Zhang Jialiang, chief scientist of OPPO VOOC flash charge, the technical difficulties have been solved, and remote wireless charging has become possible.
On the 29th, Lei Jun announced in the personal public number that millet officially released the air separation charging technology, and took the lead in the realization of millet 11. In Lei Jun's personal micro blog, he disclosed the principle of Xiaomi's air separation charging technology, which is to install an air separation charging pile indoors, and the mobile phone receives the millimeter wave emitted by the charging pile through the miniature beacon antenna.Thus, air separation charging is realized. At present, 5 watts of long-distance charging can be achieved within a few meters.
1, the second part indicates the material and structure of the device, A: PNP type germanium material B: NPN type germanium material C: PNP type silicon material D: NPN type silicon material The third part indicates the function, U: photocell K: switch tube X: low-frequency low-power tube G: high-frequency low-power tube D: low-frequency high-power tube A: High frequency high power tube. In addition, 3DJ type is a field effect tubeBT starts with a special semiconductor component.
2, the hard disk should be repaired to the professional maintenance point, we all know that the TV screen will absorb a lot of dust, and electrical components such as the hard disk will also absorb a lot of dust to the surface of the circuit board and the spindle motor periphery; In addition, the hard disk works in a humid environment, which will reduce the insulation resistance.
3, whether it is the main circuit or the auxiliary circuit, the electrical components are arranged from top to bottom, from left to right, and can be arranged vertically or horizontally. (5) Mark the voltage value, polarity, frequency and phase number of each power supply circuit. (6)The contact of the relay and contactor is drawn according to the state of the suction coil without power, and the contact of the button and the stroke switch is drawn according to the state when it is not acted on by external forces.
4, gas relay is an electrical component used in oil-immersed transformer to detect combustible gas in oil, generally installed between the transformer oil storage tank and the transformer box. When the combustible gas in the oil reaches a certain concentration, it will act and send an electrical signal to the monitoring unit or the central control room.
5, household appliances (food processing blades, vacuum cleaner components, electric fans, hair dryer housing, coffee utensils, etc.), electrical components (switches, motorsShells, fuse boxes, computer keyboard keys, etc.), automotive industry (radiator gratings, body panels, wheel covers, door and window components, etc.).
6, before ATX motherboard, there have been several motherboard specifications, the most common include Full AT, Baby AT and LBX Full AT motherboard, currently in addition to the use of some advanced large computers, has been rare, because with the continuous development of multi-functional control chipsets, the separation of components on the main board is reduced. The volume can also be reduced relatively.
1, [Pacific auto network] car MCU means motor controlunit (Motorcontrolunit), is to control the motor action module, MCU (MicroControllerUnit) is a microcontroller, mainly in the car's various peripheral circuits and interface circuit connection control, generally speaking, The most important thing is the reliability and temperature range, the temperature of the civil grade is generally 0-70, the industrial grade is 20-85, and the automotive grade is 40-85.
2, automotive mcu is the motor control unit, alsoIt is the module that controls the motor action. The MCU, or microcontroller, is equivalent to the human brain and controls all the electronic systems in the car, such as multimedia, audio, navigation, suspension, etc. It mainly connects and controls various peripheral circuits and interface circuits of the car. It is connected to all the circuits of the car and belongs to the central nervous system of the car.
3, MCU refers to the micro control unit, that is, MicrocontrollerUnit, also known as the single chip microcomputer is not the highest level, after upgrading the car mcu can improve the efficiency of the car central regulation computer, so that its function is more powerful car on-board mcMost of the upgrades are to the mcu of the car navigation system as the navigation map is constantly upgraded.
4, the car MCU is the vehicle's navigation satellite receiving antenna, located in the engine cabin of the vehicle, used to receive the positioning satellite position outside the earth to provide location information for navigation, the specific operation steps to find are as follows: open the door on the side of the cab. Pull the hood switch on the left side of the driver's leg. Lift the engine hood up. Support the hood with a support rod to ensure that the support is strong to avoid danger.
A new powerful and stable wireless charger, hidden under the desktop, through the desktop to charge mobile devices. - Extremely stable charging will not be powered off until fully charged. The future of charging A new and powerful wireless charger is hidden under the desktop to charge mobile devices through the desktop. The device input is 19V / 2A, and the charging distance can reach 45mm, while traditionalThe Qi charging distance is only 2-8mm.
The basic principle of wireless charging: electromagnetic induction: a certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
The basic principle of wireless charging is to convert the current into a magnetic field, which 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. The DC output after the power management module passes through 2M active crystal oscillator inverter is converted into high frequency AC power supply primary winding.
Using the principle of electromagnetic induction charging equipment, its principle is similar to the transformer, through the transmitter and receiver end set coil, transmitter coil under the action of power to send electromagnetic signals, the receiving end coil receives electromagnetic signals and convert electromagnetic signals into current, so as to achieve the purpose of wireless charging.
Wireless charger Principle and structure Wireless charging system mainly adopts the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. As shown in Figure 1, the input terminal will be fully powered by AC mains when the system is workingThe bridge rectifier circuit is converted into direct current, or the 24V direct current terminal is used to supply power directly to the system. 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.
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Wireless charging of mobile phones mostly uses the principle of electromagnetic induction. Electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger power supply coil) will generate a magnetic field, other unenergized coil (mobile phone end of the electric coil) close to the magnetic field will generate current, forCharge your phone.