What is the fast charging mobile power? Fast charging technology which is stronger?

Time:2017/11/25 10:58:10

Fast charging technology which is the strongest? Currently the products on the market, fast charging technology roughly four, that Qualcomm's quickcharge version, such as QC2.0 QC3.0, MediaTek Version (pump express and pump express plus), oppo vooc, and Ti Maxcharge (in fact, it is also compatible with the high QC2.0 and MediaTek pump to express agreement). Some people say fast charging technology are 5, 6, or even 7, but at present it is above four, charging breakthrough technology in the original USB 5V. Buddies to see how the story, welcome to share.
The bottleneck of conventional USB 5V charging technology, charging loop diagram as shown in figure -1, the charging loop impedance is about 0.32, we have the following formula for the 4.2V and 4.35V battery charging current:
(5-4.2) /0.32=2.5A (5V input source, Battery CV=4.2V)
(5-4.35) /0.32=2.03A. (5V input source, Battery CV=4.35V)
Therefore, the conventional way of charging the mobile phone, can not increase the charging current, can not meet the current mobile phone battery is more and more big, the charging current requirements.
A QC model and high filling technology
This is a market with fast charging technology, more millet 4C, millet note, Samsung and other mainstream brands are using this technology in charge. A relationship between the current and the high-end smart mobile phone platform. In addition, the technique is relatively simple, relatively easy to achieve, the cost is not obvious, the market is relatively easy to accept. Qualcomm QC charging technology has two versions, respectively is QC2.0 and QC3.0, and now QC3.0 mobile phone is also very small, generally still QC2.0.
The principle of fast charging technology, through different voltage D+ and USB port to D-, to apply the corresponding output voltage of charger for mobile phone charging. QC2.0 and combination is not a simple D + and D can let the charger output voltage, but there is some agreement on the inside and need to first send handshake signals, such as 1.5s handshake voltage combination, in order to the next step of output; otherwise, direct according to Fig. 4 the deuterium and D level set is not change the output voltage of the charger, which is to better protect the non QC2.0 technology of mobile phone, not due to false triggering the charger boost mechanism and burned the phone
Qualcomm QC2.0 handshake protocol:
Mobile phone charger with fast charging through the middle micro two wire USB interface (D+D-) on load voltage to the output voltage regulation of the QC2.0 communication. The handshake is as follows: when the charger will end through the data lines are connected to a mobile phone charger, the default by MOS let D+D- shorted end mobile phone charger type DCP (detected by a special charging port mode). When the output voltage is 5V, the normal mobile phone charging. If the mobile phone support QC2.0 fast charging protocol, Android user space HVDCP process will start, start voltage loading 0.325V on D+. When the voltage was maintained after 1.5s, the charger will be broken open D + and D short circuit, D - with the voltage will drop; mobile terminal detection to D on the voltage drop, HVDCP mobile phone gets the default of the charger voltage value, such as 9V set deuterium voltage is 3.3V, D - voltage 0.6V charger output 9V voltage.
QC2.0 breaks through the restriction of regular mobile phone charging current, due to the improvement of the charger output voltage, cell phone charging loop impedance to limit the charging current problem has been well solved, drawback is, efficiency is not high, heat at the end of the phone is still relatively large.
Qualcomm QC3.0 release, it makes up for the problem of low efficiency of QC2.0. The charging speed is four times faster than the conventional charging method, is two times that of Quick Charge 1, Quick Charge 2 than 38% high charging efficiency. Because the Quick Charge 3 uses the optimum voltage intelligent negotiation (INOV) algorithm can determine the need for power according to the handheld terminal, to achieve the best transmission power at any time, at the same time to maximize efficiency. In addition, the voltage of a wider range of options, the mobile terminal can be dynamically adjusted to the optimum voltage level of the support. Specifically, the voltage Quick Charge 3 supports more refined choice: take the increment of 200mV as a file, from the 3.6V to provide the flexibility to choose 20V voltage. In this way, you can choose the most suitable for a mobile phone from dozens of power levels.
Two, MediaTek Pump Express fast charge technology
And although Qualcomm QC2.0 in the realization of the way, but there are different approaches but equally satisfactory results and wonderful. Qualcomm QC2.0 is through the USB port of D+ and D- to a signal voltage, while MediaTek Pump Express fast charge technology, through the USB port of VBUS to the charger communication and apply for the corresponding output voltage. QC2.0 is to communicate through the D+ configuration and D- voltage, Pump Express is to communicate via VBUS current pulse, but the ultimate aim is to enhance the voltage charger to 5V, 7V, 9V.
Pump Express technology principle diagram, and a brief introduction to the principle of

Similar to QC2.0, Pump and Express because of the increase of the output voltage of the charger, the charging current limit exceeded. At the same time, the disadvantages are similar to QC2.0, the charger voltage profile span is relatively large, resulting in low end mobile phone charging circuit efficiency. MTK Pump and Express Plus came into being with the fast charging technology, Qualcomm is similar to QC3.0, increased the pressure regulating the number of files, each file 200mV. According to the current mobile phone battery voltage and the charging loop for attenuation, appropriate voltage to the charger, in order to achieve to maximize the power efficiency, to further reduce the amount of heat in the process of charging the mobile phone.

Three, OPPO VOOC flash charging technology
Said its own research and development of fast charge technology for vooc flash charging technology ", is the most mysterious of the fast charge technology, at present only oppo several products in use, namely find 7 and N3, the oppo this patent restrictions, other handset makers unable to follow.
OPPO officials say VOOC flash charging technology and traditional charging is the biggest difference between the charging control circuit into the adapter end, is the largest heat source transplant to the adapter. This control circuit in the adapter, and the charged battery in the mobile phone terminal, the mobile phone charging heating problem can be solved very well. Oppo claim that in order to better the charging process control (such as the control circuit need real-time monitoring of the battery voltage, temperature, etc.), especially at the end of the adapter joined the intelligent control chip MCU, adapter end of the charging control circuit and the intelligent charge control of the entire process.
But from using some show signs of view, perhaps vooc just in the traditional fast charge will be the basis of mobile phone battery points to several parts, with business as usual, and charging several parts will also charge. Therefore, in order to achieve such a fast charging speed. But although this tall on a look and feel that technology becomes the low-end. But from the final result. This technology has a strong practical value, the performance is not lost on the fast charge of other technologies.
Four, TI maxcharge
Ti maxcharge technology is Qualcomm QC2.0 and MediaTek's pump express, and ti's high performance charge management integration, more representative of the scheme BQ25895, the maximum charge current up to 5A, the maximum input voltage 14V, can be very good support QC2.0 and pump express standard charger. We offer for the Ti of BQ25890 demo board test, in 4A charging, the chip temperature of 55 degrees (in ambient temperature of 25 degrees under test), about 30 degrees of temperature rise, which if placed inside the mobile phone will be a significant source of heat.
The advantages of TI maxcharge charging technology, at the same time as QC2.0 Qualcomm and MediaTek Pump compatible with Express technology, so it is also with the optimization of QC2.0 and MediaTek Pump Express. It is the same as the disadvantages of Qualcomm and MediaTek, the overall efficiency is not very high, so the heat is larger.
In view of the fact that part of the heating problem of mobile phone charging, short time QC3.0 and Pump Express plus has not been popular, so we have other options to reduce mobile phone charging heat? The answer is yes. We are also on a battery charge with two charging chip, can reduce the calorific value of separate charging chip. Figure 12 is a dual charging chip schematic diagram, figure 13 is double demo measured BQ25890+BQ25896, setting two single charger charging current is 2a, total 4a to charge the battery, charge for 30 minutes after measured the temperature of the two chips were 42 and 40 degrees, room temperature of 25 degrees, temperature rise of chip were 17 and 15 degrees, charging scheme of temperature than the single chip rise is reduced by half. Therefore, the double charging chip scheme to improve the charging efficiency, has great advantages to reduce mobile phone charging heating.
Five, charging options
The hardware design is complex, the charging scheme selection must be applied to specific association. In this way, the plan in principle, structure, efficiency and cost in order to highlight the subtle differences between. Welcome buddies to Amoy scheme "to find a solution or sharing scheme! "There are thousands of popular technology scheme in Amoy scheme". Need to customize the program, welcome to the "I love" issued a technical task. I love the program network platform, so that the demand and supply of efficient docking, will be innovative in the end!