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Engineers are most concerned about the fast charge of these problems

21 Apr 2017 - fast charge
How to quickly charge mobile devices, has been the focus of industry attention. Whether it is mobile terminals or chip manufacturers have been committed to this, expect to shorten the phone charging time as much as possible. From 2014 onwards, a variety of charging standards, interfaces, charging methods, signal acquisition and compensation, etc., endless, fast charge has entered a very rapid development stage.
Today we are invited to the tournament microelectronics market product director Zhou Jun, and we share how to make mobile phone battery fast charge faster and more secure design tips.
The following are the same as the "
Expert introduction:
Zhou Jun, more than 10 years of battery and power product development and management experience, with a number of domestic and foreign patents, focusing on battery management and consumer power applications market, the definition of the cumulative product shipments more than 500 million.
01
Q: Will the phone in the fast charge conditions, how to solve the heat safety performance of the phone, you do the battery fast charge technology, is not any mobile phone has a common, what new technology and advantages?
A: There is no limit to the phone itself, what phone or equipment can be used. But in the mobile phone design process, the need to optimize multiple modules, such as Adapter, charging loop, battery and battery information acquisition circuit, the coordination between the modules and so on. Is not to say just take a cell phone, put our charging IC or fuel gauge chip will be able to fast charge.
Charging heat is due to the power conversion process in the efficiency of damage, the greater the current, the greater the power dissipation, the more serious heat. That, this part of the heat source, moved to other places (adapter), you can completely solve the problem of fever. This is also the current fire, low pressure fast charge / charge pump fast charge technology advantages.
02
Q: Mr. Zhou, I would like to ask fast-charge technology since so good, why Apple's mobile phone has not yet universal? Logically, Apple's standby time has been less optimistic, why Apple does not use fast charge technology? Is it because of the shortcomings of fast charging technology?
A: Many reasons, but not the agreement is flawed. Apple system has been closed (but the amount of support), there are small lighting interface (interface and take-away income, which is a lot of money), Apple charging protocol current up to 2.4A (new iphone 6 / 7 Plus can support, charge fast enough), and so on other reasons, so the Apple mobile phone, the fast drive on the driving force is not large, unless there are other restrictions.
But other products, such as MAC BOOK, with the PD is the high-voltage fast charge agreement.
03
Q: terrible wireless charge charging curve

A: This involves two aspects of the content, one fast charge agreement, such as PD, QC, etc., the other is the charging IC, the current OPPO charge IC is really TI's chip, but not TI's fast charge protocol and technology The Say more, just fast charge agreement and fast charge IC, still need to do a specific optimization of mobile phone manufacturers to achieve the desired results.
For the speed of charging, you actually have found that the high current CC part of the time, CV (constant voltage small current) stage will take a large part of the time, but OPPO 15min this is not to save or reduce the CV stage?
15min of this charging curve, regardless of protocol or charging IC, are not TI's.
04
Q: Is there no need to set the parameters of the fast chip IC chip? Please tell us about it.
A: At present to see the mainstream high current (2.5A or more) fast charge IC, need to set parameters through the external controller. The current is slightly smaller for the charging IC, which has parameters set directly through the external RC.
05
Q: Does the battery have life?
A: Yes, generally refers to the cycle life. With "how much after the cycle of battery remaining capacity greater than 80%" to characterize its life characteristics.
06
Q: Zhou teacher, may I ask whether the advanced technology or so depends on what?
A: This seems to have no clear standards, according to my understanding, to high current charging at the same time and solve the heat problem is advanced technology.
07
Q: What are the requirements for fast charging? What support is required?
A: fast charge to achieve, the need for multi-party, probably can be divided into three parts, one charger (that is, wall plug, need ACDC chip and protocol chip), the second is the charger charge management (need to charge the management chip and Protocol chip), the third is the battery side (need battery information acquisition chip or fuel gauge)
08
Q: Qualcomm QC2.0, MTK PE, VOOC these three characteristics and what is the difference? Are there any corresponding products and programs?
A: QC2.0 is a high voltage charging, there are several fixed voltage platform. Own agreement.
MTK PE, linear adjustment charger voltage output, does not support high voltage. Own agreement.
VOOC, low pressure direct charge, do not support high pressure. Own agreement.
QC and MTK program, has now been updated a lot, the latest is QC4.0 and MTK PEP3.0.
The company has a complete solution for fast charging technology, including patented charge management chip, fuel gauge, battery collection and encryption chip.
09
Q: Increase the voltage should be a lot of damage to the battery bar
A: No. The increase in voltage is the input of the phone, from the phone's input to the battery, there will be charge management chip (charger), to the voltage and current regulation, the battery side of the voltage, will be below 4.5V low voltage.
10
Q: fast charge technology can be divided into two categories: First, to improve the current program; Second, to improve the voltage of the program. Will the teacher, what kind of program in the future popularity of the broader, more secure.
A: "to improve the current", there are two ways, one is the use of ordinary high-current switching charger, such as the nominal 3A charger, this way will lead to a large fever on the phone side, the current and there is no way to do too much , Can not meet the current definition of the fast charge requirements. The other is a low-voltage high-current fast charge, typically OPPO, a larger promotion prospects.
"Improve the voltage", there are two ways, one is MTK PEP2.0 / Qualcomm QC2.0 / QC3.0, etc., this way there is no way to solve the problem of mobile phone side heating, charging current can not do too much. Another way is Type C PD (and PEP3.0 / QC4.0), by adjusting the adapter's output voltage, combined with the charge management chip (charger), to achieve high current fast charge. It now appears that this approach has a greater prospect of promotion.
11
Q: If it is not on the life of the battery pack, why from the oppo charge five minutes two hours of advertising such advertising over the past few years, fast charging technology has not been widely used ah?
A: The two reasons, one is the cost, the second is the patent. OPPO charging loop, from the charger, communication chip to the USB port and wire are specially customized, charging loop and battery (and battery interface) have also been specially optimized, both R & D costs or actual material costs are Very high, the general manufacturers do not want even can not afford. Second, the patent, OPPO is the first to do low-voltage fast-charge company, there are many patents, before last year, there is no particularly good way to circumvent its patent.
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