The communication between quick charger adapter and smartphones is the basic factor to realize quick charge technology, namely that two-way communication. Is essential in the process, communication protocol, the protocol different interfaces can vary, according to different protocol interface, Power Integrations have different solutions. So, what kind of communication protocol to achieve two-way communication?
To this, Jason Yan's answer is the charger DC power supply, communication, he said: "the output power, we in the charger of the old, old charger voltage is 5V forever, after the load lines, USB lines connected to the phone. Here have different connection interface, so we have a different approach, in the midst of the USB cable, our instruction is by hooking. This cable, there is a communication protocol, by means of D + and D - signals, this way we see is the earliest QC, 2.0 can also be from 9 volt to the latter, are likely to jump to 20V."
"D + and D - and V + and V -, and the change of output voltage and current, we can issue instructions, can send a few pulse current, can see the output voltage is higher or lower, it can also help to control the output voltage and the control is not only QC 2.0 D + and D -, but the control of the bus, including before we see the PD + (sound) agreement, now it seems this agreement no longer spread. Now deal market, each doing his own agreement, Samsung has its own, Huawei also in their own communication standards, there is no unified down completely, therefore more chaos. Agreement will introduce the PD, because it is relatively more perfect agreement, but there are some manufacturers in order to protect their intellectual property may open their communication protocol." Jason Yan explained.
For QC mentioned above 3.0, Jason Yan said that the newest communication protocol called QC3.0 now, this is not a 5, 9, 12 voltage of three steps, it can be continuous variation of the voltage, from 6 v and 12 v is a continuous change of voltage. QC2.0, charging the mobile phone is not really change using the charger of cross flow control, mobile phones have internal DC power supply, make your input voltage can be charging voltage, as charge slowly, digital voltage rise slowly, finally will be one hundred percent full. Phone the efficiency of internal DC/CD with mobile fever is relevant, if the efficiency is not high, charging time leads to cell phone fever. 9 v and 12 v output voltage may be efficiency is not high, as the energy charge slowly, voltage go up slowly, so that the DC/DC forever maintain relatively small pressure difference, this is of great help to mobile phone heat. Among the wireless charging scheme, if the DC/DC uses this solution, it also can use QC 3.0 way.
He also stressed: "power, if QC is 2.0, while the output of can see the 12 v power is larger, the 12 v / 1.5 translates to 18, walking slowly, as the voltage less than 18 watts power. And QC3.0 is continuous change, from the line to the side, the voltage drop increase in the current, voltage change when the current in decline, so we always guarantee the output current 18 watts, relative QC2.0 QC3.0 can output more power. So the quick filling effect, faster than the speed of 2.0 charged by 3.0. Relatively QC2.0, QC3.0 will decrease when cell phone charging fever. We can from 6 v two gear by file to 12 v, the characteristics of our InnoSwitch can satisfy this requirement."
Finally, Jason Yan also tells the story of the challenge for the quick charger in the design process, first of all, the achievement of design usually requires very high density, most of the design need to be able to get into the existing shell single output (old design), and less number of components, the need to achieve high efficiency to meet the demand of temperature rise; Second, the transformer must be optimized to meet the specification, the efficiency of the output voltage output voltage can be adjusted according to different communication protocols; Third, compatible with different protocols, QC, QC is 3.0, and 2.0 custom agreements need to be compatible with many other clients; Fourthly, reliable control mechanism, requires a comprehensive protection function, moreover also need to be able to smooth the output voltage switching.
Overall, quick charge technologies and related has been developed maturely, and also got good reputation in the process of commercial, unfortunately, at present the penetration of the quick charge is still not optimistic. However, with the increasingly heated competition in the smartphone market, quick charge technology undoubtedly has become a point of market competition, at the same time, introduced the rapid charging scheme of enterprise also gradually increased, such as the iPhone also are developing the technology, and is expected to be commercial in the next generation of iPhone. , of course, some companies are "first look at the" conservative attitude, at the conference, a scheme, head of the company has said that for quick charge, it will also look for a period of time, likely will move into the field. There is no doubt that in 2016 years, there will be more support quick charge smartphone market, as for the fast charging can be broke out in 2016, personal feel should be conservative attitude!