Discuss what pd is quick charge agreement, USB communication principle of pd quick charge

by:MOSO     2020-03-15
Pd charge agreement? PD is USB - charge agreement IF groups put the power transmission protocol, it can make the default maximum power type - 5 v / 2 a C interface to 100 w, Google announced Android7 at the same time. Zero or more phones quick charge agreement must support PD, quick charge market to unity. Pd agreement quick charge what do you mean the USB - PowerDelivery ( USBPD) Is currently one of the mainstream of quick charge agreement. By USB - IF to make a fast charging standard. 。 USBPD increase electricity through a USB cable and connectors, extend the USB cable bus power supply ability of application. The specification can achieve higher voltage and current, the conveying of up to 100 watts, and free to change the direction of power transmission. USBPD and Type The relationship between C. Often someone USBPD and Type C together to talk about, even the Type - C charger is called PD charger. USBPD and Type C is two different things, USBPD is a quick charge protocol, and the Type - C is a kind of new interface specification. 类型, C interface default maximum support 5 v / 3 a, but after realized USBPD agreement, can make the output power 100 w maximum support to mentioned above. So a lot of practical Type - now C interface equipment can support USBPD protocol. USBPD charger development prospect. USBPD now has developed into USBPD3. 0 version. Under the impetus of the Google mesh USBPD has incorporated qualcomm QC quick charge agreement, and received the support of the ministry of China. Is expected to soon unified chaotic quick charge market at present. PD is PowerDelivery PD quick charge agreement advantage, focus on two or more devices, even is a process of smart grid power transmission based on USB interface, power transmission can be both parties to, or even network, can have the system level power supply strategy. And QC is QuickCharge only deals with the issues of quick charge, power transmission is a one-way, don't have the ability to electric network and does not support other functions in addition to the power supply. Currently supported PD agreement equipment is less, the only known apple newMacbook, meizu and several high-end models of HTC phones, Google notebook, such as few equipment, but the spark, can start a prairie fire, but also as a domestic manufacturer introduced a PD agreement charging head, such as the author just proceed with the theory of PD charger TSM patten 1U。 ORICOTSM - 1 u use porcelain white PC material shell, overall bias square, of the two design, mostly smooth surface, close to plug place to grind arenaceous processing, increase the contact resistance and hand, easy to plug, and smooth to antifouling and raise the level of product appearance. USB communication principle between PD quick charge USBPD communication is to the news of the protocol layer made of 24 MHZ FSK signal is coupled to the VBUS or obtained from the VBUS FSK signal to realize the mobile phone and charger communication process. , as shown in the USB PD communication, is to 24 MHZ FSK by cAC Coupling capacitor is coupled to the VBUS dc level, and in order to make the 24 MHZ FSK or no PowerSupply USBHost VBUS dc voltage, and add the zIsolation inductance in the circuit consisting of a low-pass filter to filter out the FSK signal. USBPD principle to mobile phones and chargers support USBPD for example explanation is as follows: 1) USBOTG PHY VBUS voltage monitoring, if there are 5 v voltage of VBUS exists and detect OTGID feet is a pulldown resistor (1 k Not OTGHost mode, OTGHost mode the ID of the resistance is less than 1 k) , that means the cable support USBPD; 2) Normal BCSV1 USBOTG do. 2 specification charger detection and start USBPD equipment strategy manager, whether in the dc level strategy manager monitoring VBUS coupling the FSK signal, and decoding is concluded CapabilitiesSource news, according to USBPD rule parses the message get USBPD charger supported by a list of all the voltage and current; 3) Configuration according to user's mobile phone from CapabilitiesSource message to select a voltage and current, voltage and current to add on the content of the Request message, and then strategy manager to FSK signal coupling to VBUS dc level; 4) Rechargers decode FSK signal and Accept messages to mobile phones, at the same time, adjust the PowerSupply dc voltage and current output; 5) Receive the Accept message, adjust ChargerIC charging voltage and current; 6) Mobile phones can dynamically in the process of charging sends the Request message to Request the charger change output voltage and current, so as to realize the process of quick charge. The above information sources from the network, if there is infringement or error contact deleted! ( Judgment remain neutral to the statement, views, not contained in the accuracy, reliability or completeness of the contents provide any express or implied warranty. )
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