Power Delivery of PD full name, chinese meaning transmits management for power source.

 

In August 2014, USB-IF issued the level of TYPE-C 1.0 interface that has revolutionary sense extremely and USB PD2.0 standard, innovation sex ground came true to be on CC of appropriative communication line, undertake signal of USB PD communication is transmitted.

 

In Feburary 2017, what USB-IF released USB PD3.0 is important newer, aim unify charges quickly the PPS(Programmable Power Supply) of technical standard, implementation sends division PE3.0/2.0 to connecting QC4.0/3.0, couplet high, China for / the incorporate into one’s own forces of the plan such as OPPO.

 

October 2017, IPhone8, IPhoneX is released, announce to support PD to fill an agreement quickly, PD gains ground enter drive

 

The purpose of USB-IF promotion PD is unified and fast charge agreement, from the point of the change of the market, also developing toward this direction, connected QC4.0 agreement and MTK3.0 agreement high to use the PHY layer of PD3.0 to design. Can foreknow nevertheless, coexist from much agreement unified still need 2-3 at least year time, during this, much agreement remains the development main aspect of fittings market, and in numerous agreement, PD agreement will be rigid index of the client.

 

Choose appropriate framework

The PD mobile power supply with should design good, the framework with right choice is very important. There basically is hardware SOC, software SOC, MCU+DC-DC on market at present 3 kinds of frameworks:

 

 

framework of mobile power source, absolutely without “ best with the poorest ” , more the demand ” that can get used to a technology develop most in the pain spot ” that who can solve a client most at “ and “ .

 

 

Software SoC framework is a MCU and DC-DC compositive be in same on SoC chip, satisfy the requirement of flexibility already, also have compositive the characteristic with little parts of an apparatus of degree of tall, periphery. But MCU and DC-DC the development course of two kinds of technologies differs completely, craft difference is very big also, should be in same compositive MCU is mixed on chip DC-DC, accomplish high reliability difficulty very big. Current, chip of stable without special maturity still software SOC PD. Accordingly, the plan of PD mobile power source of the framework that suggests discretion chooses software SOC.

 

 

Hardware SOC framework becomes PD agreement solidify hardware, have cost the characteristic with rapid rate of low, development. A lot of people think to be below the case that does not pursue functional diversification, hardware SOC is best choice, this often is their oversight the expands process and PD agreement integrality of PD agreement. The integrality of PD agreement, depended on providing the whole agreement framework that video of electric energy and data, sound transmits, stay again at the same time have VDM, wrap a function from definition data namely, make an enterprise OK undertake demesne consultative processing, and batteries management, firmware upgrades, add demesne wait closely, the “ that so each product still has an agreement demesne ” component is, unfinished is completely unified. Accordingly, your product crossed even if attestation, also may not can be compatible all equipment on market. Perhaps someone can say, my product had obtained USB-IF approbate, incompatible the problem that is equipment then, not be the problem of my product. However, the product certification that terminal user can not consider you not attestation, the product that can see you only can undertake charging to his terminal. From the development of PD agreement so process and integrality consider, do not recommend at present choose hardware SOC to design product of PD mobile power source.

 

 

Look at present, the mature cycle of PD product needs 2-3 at least year time, before this, the flexibility of PD agreement is attached most importance to especially to the compatibility of the product should, and can at the same time the framework of dependability of give attention to two or morethings and compatibility is MCU+DC-DC framework. At present the manufacturer of semiconductor of PD of mainstream of a gleam of on market, if surpass science and technology of sea of Pulasi, TI, core to wait, all be the framework that uses MCU+DC-DC.
 

The mobile power source of typical MCU+DC-DC framework is designed

 

 

MCU+DC-DC framework can choose the MCU with powerful function serve as main body, it is with the Smart PD MCU CSS32G020 of core sea science and technology exemple, choose ARM®Cortex™-M0 kernel, supportive PD3.0 PPS all sorts of commonly used fill an agreement quickly. Chip is compositive a variety of consultative PHY layers, communication content can undertake upgrading through software, what can get used to a variety of mobile phones on market is fast charge demand.

 

 

Mobile to current PD power source is A mouth and C mouth exist at the same time commonly, consultative allocation is PD agreement puts C mouth commonly, other fill an agreement quickly to put A. But to two setting that the mouth receives facility at the same time, different client is different to the functional definition of this part.

 

From the function definition angle sets out, function of core of mobile to PD power source is PD is filled quickly, the output power of mouth of the C below whatever circumstance should not suffer the effect of A mouth, otherwise a lot of equipment (like jotter) because C mouth falls power and cannot charge. It is to the client demand of this part: Random the mouth receives equipment to have fill quickly, when A mouth and C mouth receive facility, c mouth keeps fast fill, a mouth outputs 5V only.

 

From cost definition angle sets out, two the mouth receives equipment to maintain PD to output cost at the same time too tall, demand of this part client is: Random the mouth receives equipment to have fill quickly, 5V can be outputted jointly only when A mouth and C mouth receive facility.

 

Enter fill a times quickly, the definition of mobile power source also won’t resemble traditional and mobile power source again in that way the function is single, different client is logistic to much mouth pilot demand will be different, still have indication kind additionally, sign up for police type, control means can have diverse demand.

 

And custom-built to the function change, just is the traditional strong point of MCU, can boost diversification demand of the client.

 

 

Product of traditional mobile power source, if upgrade because of compatibility, agreement, the client revises the problem such as change, need upgrades firmware, can reclaim only – tear open housing – burn afresh write firmware, cost is very high. PD3.0 V1.1 defined firmware to upgrade functional standard, it is to solve this problem, it is PD3.0 great to a of PD2.0 upgrade. Because PD agreement has development speed to be mixed quickly,allow the character that changes demesne, the demand that firmware upgrades will be more.

 

The settlement with the very good CSS32G020 of core sea science and technology this problem: Upgrade through TYPE-C interface firmware. If encounter need to upgrade the circumstance of firmware, need not tear open machine, join the product PC can come true through data line upgrade, hardware SOC framework can not be likened to this.

 

 

Development cost is high, it is the pain spot of MCU+DC-DC plan all the time. Especially PD agreement at every turn the English data of about a hundred page, it is a very big challenge to software engineer. To solve this pain spot of the client, core sea science and technology rolled out Smart PD graph technically to turn development tool. The user need not know the detail of PD norms, also need not study software development, do only tick off simply choose configuration, with respect to the software development that can complete PD mobile power source. The content that can install includes PDO, RDO, VDM, company the information such as special VID, PID, TID, and each parameter of mobile power source, for example: Spread a cost too, press value, temperature to protect parameter of internal resistance of parameter, batteries, indication means to wait too.

 

Epilogue:
 

From the development process of PD agreement and integrality consideration, the framework that suits design of PD mobile power source most is MCU+DC-DC framework. Unite completely in PD agreement before be being filled quickly, supportive firmware upgrades, cooperate a graph to turn development tool, it is the optimal alternative that develops PD mobile power source.