What does PD charging protocol mean?

PD charging protocol is a power transmission protocol announced by the USB-IF organization. It can increase the current default maximum power of 5V/2A type-c interface to 100W. At the same time, Google announced that mobile phones with Android 7.0 or above will be equipped with The fast charging protocol must support the PD protocol, which is intended to unify the fast charging market.

PD charging protocol is a power transfer protocol announced by the USB-IF organization. It can increase the current default maximum power of 5V/2A type-c interface to 100W , at the same time, Google announced that the fast charging protocol equipped with mobile phones above Android 7.0 must support the PD protocol, aiming to unify the fast charging market.

Advantages of PD fast charging protocol

PD is PowerDelivery, focusing on the power transmission process of two or more devices, or even a smart grid based on USB interface , power transmission can be bidirectional, or even networked, and can have system-level power supply strategies. QC is that QuickCharge only focuses on fast charging. The power transmission is unidirectional, does not have power networking capabilities, and does not support other functions besides power supply.

Currently there are relatively few devices that support the PD protocol. Only Apple’s new Macbook, several high-end models of Meizu and HTC mobile phones, Google notebooks and a few other devices are known. However, a spark can eventually start a prairie fire, and Domestic manufacturers are gradually launching PD protocol charging heads, such as the Orrick PD charger TSM-1U that I just bought. ORICOTSM-1U uses a porcelain white PC material shell. The overall shape is square. It adopts a two-stage design. Most of the surfaces are smooth. The area close to the plug is frosted to increase the contact resistance with the hand and is easy to plug and unplug. Smooth areas can prevent stains and improve product appearance.

The principle of US BPD, taking the example that both the mobile phone and the charger support USBPD, is explained as follows:

1) The PHY of USBOTG monitors the VBUS voltage. If there is 5V of VBUS If the voltage exists and the OTGID pin is detected to be a 1K pull-down resistor (not in OTGHost mode, the ID resistor in OTGHost mode is less than 1K), it means that the cable supports USBPD;

2) USBOTG does normal BCSV1.2 The standard charger detects and starts the USBPD device policy manager. The policy manager monitors whether the FSK signal is coupled to the DC level of VBUS, and decodes the message to obtain the CapabilitiesSource message. It parses the message according to the USBPD specification to obtain the USBPD charger. All supported voltage and current list pairs;

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, and then manages the policy The charger 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 After receiving the Accept message, adjust the charging voltage and current of the 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, thereby achieving a fast charging process.

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