The slogan "Charge for five minutes and talk for two hours" is actually popular because of the popularity of smart phones nowadays. In order to make up for the shortcomings of the lack of battery life of smart phones, charging treasures and mobile phone fast chargers have appeared. Especially in the face of the prevalence of non-removable batteries, the existence of charging treasure and fast charging is becoming more and more necessary. Yes, the rapid iteration of mobile phones makes its charging method constantly changing. However, 13 years ago, we had little trouble with the battery life of mobile phones. This is not because the battery capacity of mobile phones at that time was larger than now, but because we used mobile phones with detachable batteries, and we also had a replacement battery, and we also had a supreme charging artifact-universal charging.
Universal charger (network diagram) which has been popular for ten years
"Your father's mobile phone charger is not at home, so I'll use it to charge it for a while." One day in 22, when Chen Tianhan, a sophomore in Zhengzhou No.1 Middle School in Zhengzhou City, Henan Province, was reading a book after lunch, a relative who was a guest at home asked.
Chen Tianhan promised to find out the charger that Dad put in his bag, but it didn't work at all.
"No, my mobile phone has a trapezoidal head, not a flat head." Relatives said helplessly.
Chen Tianhan patted his forehead and secretly scolded himself for being stupid at lunch. Later, Chen Tianhan looked at his relatives' mobile phone models and remembered that his neighbor's uncle was also the same brand, so he borrowed it. However, although the charging problem has been solved, Chen Tianhan has made an old mistake and can't settle down to reading.
Chen Tianhan, born in p>1985, has a strong practical ability since childhood. When he was three years old, he couldn't figure out why the sofa was so soft, so he dissected the sofa with a fruit knife. When he was a little older, he couldn't figure out why the clock moved, why the tape recorder sounded, why the TV set had pictures, and why the computer could access the Internet, so he took it all apart again. This once caused his parents a headache. Of course, the "King of Destruction" Chen Tianhan's children's shoes were not less beaten for this.
In order to curb the destruction of his son's talent from the root, dad also asked Chen Tianhan to write a letter of guarantee of "taking care of things and putting an end to destruction", and bought some detachable toy equipment for Chen Tianhan to ponder, so as to "respect his son's interest on the basis of avoiding the loss of family property". However, Chen Tianhan is a master of "remember to tear down but not to fight", and Chen's father's request is just like air when his interest comes. At this moment, because of the problem of mobile phone charging, Chen Tianhan's heart is active again. Of course, now Chen Tianhan is no longer the curious baby who was disassembled at random when he couldn't figure it out.
In fact, Chen Tianhan's attention to the problem of mobile phone charging is not a day or two, so he took this opportunity to put down the heavy schoolwork in high school and took a break from his busy schedule. Chen Tianhan first found his uncle who loves tinkering with electrical appliances, but he denied it before listening to it. It is not realistic to say this, because the charging head of the mobile phone charger is not a master key, nor can it be changed like the Monkey King's golden hoop, and reminds Chen Tianhan to focus on learning.
"Curious Baby" Chen Tianhan (network diagram)
Uncle Chen Tianhan's veto did not discourage him. Later, Chen Tianhan found Ma Jian, who was the technical director of Zhengzhou Tsinghua Alumni Entrepreneurship Development Co., Ltd. who had coached him for several times to make inventions and innovations. But here, Chen Tianhan's idea was rejected again.
"Tian Han, think about it, you are definitely not the only one who has this idea. Those mobile phone manufacturers must have pondered it, but why they didn't develop it is not how difficult it is, but meaningless." Ma Jian said, "Think about it, different mobile phones have different battery specifications, and these batteries have different specifications for chargers. Even if you can make a charger suitable for all kinds of batteries, how can you ensure that the charger will not cause harm to the battery?"
But how do you know if you don't try? Chen Tianhan thought. Chen Tianhan, who was hit twice in a row, not only didn't give up the idea of making this charger, but was more determined about his goal. Therefore, he was unwilling to let Ma Jian help him find a breakthrough, and then he took on the task of investigating the charging law of mobile phone batteries alone. In the days to come, Chen Tianhan will go to the mobile phone shop when he has nothing to do, pretending to be a mobile phone buyer, in order to find the similarities of mobile phone batteries. In addition, he bought a lot of mobile phone chargers, disassembled them and pondered the structure and working principle of the chargers. Every time I get something, I write it down in a notebook or draw a picture.
The internal structure (network diagram) of the traditional mobile phone single-use charger
It's much dismantled, and Chen Tianhan is more sure that the problem that different types of mobile phones can't use chargers can be solved. He found that the internal structure of chargers on the market is almost the same, and the working principle is almost the same. They all convert 22V high-voltage DC into the voltage value required by the charged equipment through switching triodes and transformers, thus charging the mobile phone battery. The role of the charger is only to change the form of electric energy. Excluding the voltage problem, the reason why the mobile phone charger can't be universal is the matching degree between the charger connector and the mobile phone charging interface.
However, this problem was solved automatically after Chen Tianhan drew 263 kinds of charging contact points of mobile phone batteries. Chen Tianqi found that the height of the contact points of all mobile phone batteries is almost the same, and the difference is only the distance between the positive and negative contact points!
with this great discovery, the remaining work is relatively much easier. So, after a preliminary sketch of the universal charger was drawn, Chen Tianhan collected materials and officially started research and development. Soon, the first charger sample came out. However, due to the unfixed position of the contact pin of the charger, poor contact often occurs, so Chen Tianhan had to improve this charger again. It took another two weeks, and the first universal charger-a charger that uses a splint to electrify the battery contacts of mobile phones was born.
schematic diagram of universal charger (network diagram)
The universal charger invented by Chen Tianhan is mainly composed of an oscillation circuit, a charging circuit and a voltage stabilizing protection circuit, and its structure and working principle are basically the same as those of ordinary single-use chargers. But what is different is that the charger has no charging plug, instead, it has two contact pins, which are charged by the contact between the contact pins and the positive and negative contacts of the battery, and the contact pins can be adjusted according to the distance between the positive and negative contacts of the battery. In order to adapt this charger to the charging requirements of various types of mobile phone batteries, after consulting hundreds of different types of batteries, Chen Tianhan set the output voltage of the charger to 4.2V. In addition, Chen Tianhan also added an indicator light to his invented universal charger to indicate whether the contact method is correct and whether the battery is full.
Later, Chen Tianhan improved the second generation charger on the basis of this charger. Compared with the first generation charger, the second generation charger is obviously a little more exquisite. It is worth mentioning that the charging contact pin of the second-generation charger was modified by Chen Tianhan with a spring removed from the bicycle.
Circuit diagram of universal charger (network diagram)
On April 15th, 23, Chen Tianhan submitted a patent application for utility model through Zhengzhou Kewei Patent Agency Co., Ltd., and obtained the patent number. On July 14th of the same year, Chen Tianhan applied for a patent for his own "telephone call recorder". In September, at the 18th National Youth Science and Technology Innovation Competition, Chen Tianhan won the first prize in engineering and the "Intel Talent Award" for his all-round development, and participated in the World Youth Science and Technology Innovation Competition in Atlanta, USA in 24. In May, 24, thanks to Wannengchong, Chen Tianhan was awarded the qualification of walking to Tsinghua University Journalism Department.
Yes, Chen Tianhan didn't become an engineer or inventor as we thought, but became a media worker. Today, Chen Tianhan is the deputy editor-in-chief of a domestic website. In fact, this is a reasonable thing, isn't it? Interest doesn't have to be a career, because it's like taking your favorite music as a wake-up bell, which is a kind of disillusionment. And it is those seemingly unreasonable things and ever-changing life trajectories that make our lives rich and colorful. We can never predict the future, otherwise, how can Universal Charge become a thing of the past, and how can Wifi and smart phones penetrate into our lives so deeply that low-headed people like me can't leave.
Today, Chen Tianhan is the deputy editor-in-chief of an information website (Qianlong. com)
However, although Chen Tianhan did not continue his own road of invention, Wannengchong was really popular for ten years. Moreover, at the beginning of the universal charging, its popularity can be described as terror. Take Shenzhen Hailutong Electronics Co., Ltd., the first company in China to market Universal Charging, as an example. In 23, its first batch of hundreds of thousands of trial orders were sold out in just three days. The reason is that the mobile phone market was not as developed as it is now, and it is difficult for people to find a matching charger after the original charger is damaged or lost. In addition, in order to meet the needs of consumers, most mobile phones at that time were randomly equipped with two batteries. The spare battery plus universal charge is the "original version of charging treasure". It is no exaggeration to say that the importance of universal charging for mobile phones at that time was even more important than that of charging treasure for smart phones now. Moreover, the decade of omnipotent charging is also the golden decade where China's mobile phone market is developing. Therefore, under the influence of various factors, Wanneng has become a necessary charging artifact for almost all mobile phone users in China.
The classic black three-lamp universal charger (network diagram)
Naturally, the universal charger, which has been popular in the mobile phone charger market for ten years, has undergone many improvements during this period. Not only its volume is getting smaller and smaller, its appearance color is getting more and more colorful, but also its stability and safety are greatly improved. However, just like a master key that can't be opened without a lock, the universal charger can charge all mobile phone batteries, but it is not the one that fits the keyhole best after all. Unable to adjust the output voltage to match the demand of the mobile phone, it will inevitably cause damage to the mobile phone battery. Therefore, under the ever-changing wave of the mobile phone market, the universal battery eventually lost to the non-removable battery and charging treasure. Moreover, we can no longer say that although we have different brands and models of mobile phones, we use the same charger-Wanneng Charge.
References:
Science and Education News 23.9.18.
China Patent Inquiry System. Chen Tianhan;
list of winners of outstanding scientific and technological innovation projects in the 18th National Youth Science and Technology Innovation Competition 23.8.26
Henan Entrance Examination Information Network. List of students admitted to colleges and universities in Henan Province in 24 and walked in 24.5.28.