Circuit analysis of wireless charger

Wireless charging has entered reality from dream and turned from concept to commodity. In recent years, it has led a new trend in mobile phones, electric vehicles and other fields. It proves that wireless charging technology has a very broad market prospect. The following is a micro distance wireless charger circuit scheme. This scheme is a feasibility exploration experiment. Then, let's learn about the circuit analysis of the wireless charger scheme! Scheme and principle of wireless charger The wireless charger scheme converts DC into high-frequency AC, and realizes the wireless power supply through the mutual inductive coupling between the primary and secondary coils without wired connection. The basic scheme is shown in the figure. The wireless charger is composed of power transmitting circuit, power receiving circuit and charging control circuit. Power transmission department The power supply of the transmitting unit of the wireless charger scheme includes 220V AC and 24V DC, which are selected by the relay J. According to the principle of AC priority, the normally closed contact of relay J in the figure is connected with DC (battery BT1). Usually S3 is on. When AC power is supplied, the rectified and smoothed DC adsorption relay J of about 26V acts in the form of AC power supply, the DC power supply BT1 is disconnected from the power transmission circuit, and LED1 (green) emits light to indicate its state. The 24V DC power selected by the relay J is mainly supplied to the transmitting coil L1. In addition, it is supplied to the integrated circuit IC2 after being depressurized by IC1 (78l12). Therefore, in order not to make the action of J affect the stable action of the transmitting circuit, the capacitance of capacitor C3 must be more than 2200uf The wireless transmission of power is actually realized through the mutual inductance of transmitting coil L1 and receiving coil L2, in which L1 and L2 constitute the primary and secondary coils of coreless transformer. In order to ensure sufficient power and as high efficiency as possible, it is appropriate to select a high modulation frequency and consider the high-frequency characteristics of the equipment. Generally, the distance between the receiving coil L2 and the transmitting coil L1 is only a few centimeters, which is close to coaxial, so high transmission efficiency can be obtained. The principle of charging control circuit unit is shown in Figure 2-3. The effective value of 1.6mhz sine wave voltage induced by L2 is about 16V (no-load). After bridge rectification (composed of four 1N4148 high-frequency switching diodes) and C5 filtering, about 20V DC is obtained. As the power supply of the charging control unit. As the prototype of the feasibility exploration experiment, the wireless charger scheme is only for small capacity lithium-ion batteries and lithium polymer batteries of about 100mah. It is suitable for pocket digital products such as MP3, MP4 and Bluetooth headset. There are no obstacles in principle to popularize it into high-capacity batteries. Of course, from laboratory prototypes to market products, there may be long and arduous work such as electromagnetic radiation leakage, cost control and product technology, market entry and consumption start. The above is the circuit analysis of the wireless charger scheme. For more information, please feel free to contact us!

Which domestic manufacturer of wireless charging chips is better?

In the face of many wireless charging chip manufacturers, it is not so simple to find a reliable one. In order to avoid cooperation with some informal enterprises. Next, Xiaobian will give you a detailed introduction, hoping to bring help to relevant people. If you are also interested in this topic, you might as well have a look together. Which domestic manufacturer of wireless charging chip products is better? I believe this issue is a topic that many people in the industry are more concerned and interested in. When buying such products, we must find formal enterprises. In this way, there will be security. If you want to ask which one is good, in fact, most companies do very well, and their qualifications are relatively complete, so we only need to meet the basic needs when looking for it. After many investigations and understanding, it is worth mentioning that this wireless charging chip manufacturer was established in August 2012, focusing on the R & D and sales of fully synchronous digital demodulation wireless charging IC. They are also bringing high-quality and convenient perception experience to mobile devices, consumer electronics and other wireless charging products, Since we want to cooperate, we also need to know that the company has sufficient technology R & D and quality control capabilities, and their core R & D team comes from R & D elites of Ti, NXP and St. They have been established for a long time and have a large scale, so they are very good in comparison. If you are still struggling with this matter, you might as well go here and have a look. This manufacturer of wireless charging chip products is very good in all aspects, and it is also very famous. I suggest you call to communicate, so that you can know how their service is. The manufacturer of wireless charging chip products provides global enterprises with high-quality wireless charging IC and technical solutions, which has won the trust and support of customers. The products using their wireless charging scheme are exported to the United States, Europe, Japan, South Korea and other countries and regions. Our company's products are very reasonable. I'm sure you will like them. If your industry needs it, you can order it here. Over the years, we have served our customers with high-quality services and reliable products, returned to the society and won countless honors and praise. Wireless charging chips have been widely used in mobile phones, medical treatment, smart home, digital products and many other fields. And the reputation among consumers is getting better and better. Therefore, if we cooperate with such companies, we will be more assured. The products of wireless charging chip manufacturers have also been sold to many places in the country. The content of the above article is a more formal wireless charging chip manufacturer to share with you. If you see it, you can also share it with friends in need. If you don't understand, you can pay more attention to the website. We will bring more content down. Remember to watch it.  

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