However, if there is a small change in the distance between the power supply and the receiving device, the resonance frequency will also change. To solve this problem, researchers developedA wireless charger has been developed that can transmit power even if the distance from the receiving device changes. However, this method is not practical, and the amplifier itself needs to use a lot of power to achieve the amplification effect, resulting in the transmission efficiency of the system is only about 10%.
Wireless charging charger is a small transformer, its role is to convert the home voltage into a mobile phone voltage that can be loaded by the mobile phone battery. When the charger converts the household voltage into the load voltage, the load voltage is reduced, thus reducing the charging efficiency of the charger. The power amplifier can be amplified by the power, not only to meet the safetyComprehensive, while improving the charging efficiency.
Field effect tube, an electronic device that uses an electric field to control the flow of current, its working principle is the source, gate and drain core, by adjusting the strength of the grid electric field to adjust the drain current. This kind of device plays a key role in the field of electronics because of its high input impedance, low output impedance and high gain.
Question 6: How to do 1kw AC wireless charging First, you must have a DC source that can provide 1KW output power, second, you need an amplifier with a power capacity of more than 1KW, third, you need to do as much as possibleCan reduce the loss of the transmitting coil, otherwise the ohmic loss is too large, the heat generated will burn the system, and finally, you need to do a good job of shielding measures, otherwise you can not enter the market.
The researchers achieved this by integrating an amplifier and a feedback resistor that allows the system to automatically adjust the operating frequency when the distance between the charger and the moving object changes. However, the initial system is not efficient enough to be practical. The amplifier itself requires a lot of power to achieve the amplification effect, resulting in the system being able to transmit only 10% of the power.1, to change the ordinary mobile phone to wireless charging, usually need to use a wireless charging receiver and the corresponding modification tools. Please note, however, that this modification may damage the phone or void the warranty, so it is recommended to proceed only after fully understanding the risks and consequences. Wireless charging technology, which allows users to charge devices without plugging in a cable, has become increasingly popular in recent years. However, not all phones support wireless charging natively.
2, the mobile phone vertically placed on the wireless charger charging: please first put the wireless charging pad high block on the wireless chargerOn the tray, increase the tray height, and then place the phone on the wireless charger to charge; Horizontal charging of the mobile phone on the wireless charger: The mobile phone can be directly placed on the wireless charger to charge without placing the wireless charging pad. If the wireless charging pad has been placed before, please remove it first and then charge it horizontally.
3, self-made wireless charger 1: external module installation steps Stick the module in the place from the MicroUSB interface comparison. Step Connect the MicroUSB or Lightning port on the module to the phone. Steps If there is double-sided tape on the receiver, you can directly applySuch as automotive power supply), selected by relay J. In accordance with the principle of AC priority, the normally closed contact of relay J in the figure is connected to DC (battery BT1). Normally, S3 is connected.
This circuit diagram uses the chip sl1052 as the control, the structure is simple and the function is complete. ? 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.
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.
However, the load is generally designed for 2x U input. The larger the filter capacitance, the higher the output voltage, and the lower the vice versa. In single-phase bridge rectifier circuit, if there is no filter capacitor, the output voltage is 0.9 times of the AC input voltage when the load is openThat is: U output =0.9*U input. Under load, the formula remains the same: U output =0.9*U input. This conclusion is applicable to both bridge and full wave rectifier circuits.
Mobile phone wireless charging is a relatively novel charging method, the principle is actually very simple, is to separate the ordinary transformer primary and secondary levels to achieve the purpose of wireless. Of course, the working level of wireless charging is relatively high, and even the role of energy transfer can be achieved between the iron core and the direct coil can be abandoned. Drawings to there are a lot, but will not send pictures, to tell you about the simplest wireless charging.
With a sense of accomplishment,I have created a charging bank that supports two-way fast charging and wireless charging, with a capacity of up to 14000mAh, compatible with a variety of fast charging protocols such as 15W wireless charging, 10W wireless charging, SCP, VOOC and PD0. Now, let me walk you through every aspect of this innovative project, from circuit design to actual operation.
1, the basic principle of wireless charging is to convert the current into a magnetic field, which is transmitted through the air and converted into a current to be transmitted to the intelligent terminal. The input will communicate when the system is workingThe mains is converted into direct current by the full bridge rectifier circuit, or the 24V direct current terminal is used 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.
2, if the use is vivo mobile phone, wireless charging is also known as inductive charging or non-contact inductive charging, based on the principle of electromagnetic induction, the device that needs to be charged can be charged by contacting the wireless charger after being energized.
3, wireless charging system mainly uses the principle of electromagnetic induction. The wireless charger refers to the end that needs to be charged without the traditional charging power cordThe charger on the end device adopts the latest wireless charging technology, and transmits electric energy magically by using the magnetic field generated between the coils. The inductive coupling technology will become the bridge connecting the charging base station and the device.