Talking about what is pd fast charging protocol and the communication principle of usb pd fast charging

by:MOSO     2020-02-18
What is the pd charging protocol? PD charging protocol is USB- IF the power transmission protocol published by the organization, it can make the current default maximum power of 5 V/2A type- C interface increased to 100 W, while Google announced Android7. The fast charging protocol for mobile phones above 0 must support PD protocol, which is intended to unify the fast charging market. What does pd protocol fast charging mean USB -? PowerDelivery (USBPD)It is one of the current mainstream fast charging protocols. Is by USB-A fast charging specification formulated by IF Organization. . USBPD increases power transmission through USB cables and connectors to expand the power supply capability of cable bus in USB applications. The specification can realize higher voltage and current, transmit up to 100 watts of power, and can freely change the transmission direction of power. USBPD and Type-The relationship of C. People often put USBPD and Type-C put together to talk, even put Type-C charger is called PD charger. USBPD and Type- C is actually two different things, USBPD is a fast charging protocol, and Type-C is a new interface specification. Type- By default, interface C supports a maximum of 5 V/3A, but after the USBPD protocol is implemented, the output power can be as high as 100W mentioned above. So now many practical types- All devices with interface C support the USBPD protocol. Development Prospect of USBPD charger. USBPD has now developed to USBPD3. 0 version. In Google's push, USBPD has Incorporated Qualcomm's QC fast charging agreement and won the support of China's Ministry of Industry and Information Technology. It is expected to unify the current chaotic fast charging market in the near future. Advantages of PD fast charging protocol PD is PowerDelivery, which focuses on two or more devices, even the power transmission process of a smart grid based on USB interface. Power transmission can be bidirectional, even networked, can have system-level power supply strategy. However, QC is QuickCharge, which only focuses on fast charging. Power transmission is single-directional, does not have power networking capability, and does not support other functions except power supply. At present, there are relatively few devices that support PD protocol. Only Apple's newMacbook, Meizu and HTC mobile phones are known to be several high-end models, Google notebooks and other few devices, but the spark trend, in the end, it can start a prairie fire, and some domestic manufacturers have gradually introduced charging heads of PD agreement, such as the TSM-1U. ORICOTSM- 1U uses a porcelain white PC material shell, which is inclined to be Square as a whole and adopts a two-stage design. Most of them have smooth surfaces and the place close to the plug is frosted, increase contact resistance with hands, easy to plug, and smooth place can prevent pollution and improve product color value. The communication principle of usb pd fast charging the communication of usb pd is to modulate the message of protocol layer into 24 mhz fsk signal and couple it to VBUS or obtain FSK signal from VBUS to realize the communication between mobile phone and charger. the process. As shown in the figure, in usb pd communication, 24MHz FSK is passed through cAC- The Coupling capacitor is coupled to the DC level on the VBUS, and in order to make the 24MHz FSK not affect the vbus dc voltage of PowerSupply or USBHost, A low-pass filter composed of zIsolation inductors is added to the loop to filter out FSK signals. The principle of USBPD is explained as follows: 1) The PHY of USBOTG monitors the VBUS voltage. If there is a 5V voltage of VBUS and the OTGID pin is detected, it is a 1K pull-down resistor ( Not in OTGHost mode, the ID resistance of OTGHost mode is less than 1 K) , It means that the cable supports USBPD; 2)USBOTG do normal BCSV1. 2 The standard charger detects and starts the USBPD device policy manager. The policy manager monitors whether FSK signals are coupled on the direct current level of VBUS, and decodes the message to obtain the CapabilitiesSource message, parse the message according to the USBPD specification to obtain all voltage and current list pairs supported by the USBPD charger; 3) The mobile phone selects a voltage and current pair from the CapabilitiesSource message according to the user's configuration, and adds the voltage and current pair to the payload of the Request message, then the policy manager couples the FSK signal to the vbus dc level; 4) The charger decodes the FSK signal and sends an Accept message to the mobile phone, while adjusting the DC voltage and current output of PowerSupply; 5) The mobile phone receives the Accept message and adjusts the charging voltage and current of ChargerIC; 6) During the charging process, the mobile phone can dynamically send a Request message to Request the charger to change the output voltage and current, thus realizing the process of fast charging. The above information is collected from the network. If there is any infringement or wrong contact, delete it! ( Be neutral to the statements and opinions in the text, and do not provide any express or implied guarantee for the accuracy, reliability or completeness of the contents contained. )
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