What are the characteristics of PD charger

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At the beginning, it is sure that the iPhone 13 supports the USB PD fast charging function, and the maximum power is as high as 22W+ for the two Pro models. Since it supports PD fast charge,  let's do the PD fast charger and a 5W charger comparison now.

iPhone 13/iPhone 13 pro can fast charge power up to 22W +, 30W PD charger and 18W PD charger, the speed gap is about a few percentage points, the pursuit of cost-effective users can purchase 18W PD charger. Users with higher demand can increase their budget to purchase 30W PD charger. In addition to better service for iPhone 11, it can also be used for iPad, thin and light notebooks, etc.

Next, is the consideration of max power out. For the iPhone, according to the test, the 18W charging speed has met daily needs, considering daily portability and compatibility. Inviolabs recommends using an 18W dual port charger. Provide dual PD and QC interface, full compatibility.

The extra power is also generated in a different way. Non-PD fast charging solutions generally increase either current or voltage (beyond the normal levels for USB charging), but not both. This is mainly down to the hardware limitations of non-PD USB charging and restrictions on what a smartphone battery can handle. It takes a lot of trickery with smart negotiation and variable voltage/current to be able to get around these limitations and increase charging speeds. Most forms of fast charging increase the voltage while keeping the current somewhere around the standard 2A, while recently some Chinese manufacturers have been doing the opposite, keeping the voltage at the standard 5V and using very high currents (requiring very thick charging cables to match).In contrast, USB PD is a complete redefinition of what is possible with USB charging. In the brave new world of USB PD, both voltage and current can be raised to high levels simultaneously, allowing for very high power outputs. The table below shows the the maximum current, voltage, and power of a selection of charging standards. Notice how only USB PD supports both high voltage and high current. The next most powerful standard (Super VOOC) may use very high current, but the voltage is the same as USB 2.0.