USB-C Power Delivery Dongle Timing for PPS Fast Charging
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Solution Overview
Problem
Conventional dongles fail to meet the requirements of Programmable Power Supply (PPS) standards for fast charging, particularly in completing power adjustments within the specified 25 milliseconds due to time-consuming procedures and insufficient resolution in voltage detection, leading to heat generation and inefficiency in power delivery.
Innovation Solution
A dongle with a controller that delays the request accept message and includes waiting timers to manage power delivery, ensuring compliance with PPS standards by bypassing the power request temporarily and triggering Power Good Interrupts for precise voltage adjustments, thereby meeting the 25-millisecond requirement and maintaining the power delivery link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dongles process power requests immediately, then the power delivery response is fast, but the power adjustment cannot meet the 25-millisecond requirement of PPS standards
Solution Approach 1:
The dongle performs preliminary actions by detecting voltage in advance before the power request is fully processed, and prepares the power adjustment response ready ahead of time. This allows the dongle to meet the 25-millisecond PPS requirement by having the response prepared before the deadline occurs.
Solution Approach 2:
The controller acts as an intermediary between the power supplying device and power receiving device, managing the power negotiation process and timing. It intermediates the power request handling by inserting appropriate delays and coordinating the timing of accept messages and power adjustments to meet PPS standards.
2Measurement precision
If the dongle sends request accept message immediately, then the power delivery is efficient, but voltage detection resolution is insufficient
Solution Approach 1:
The dongle performs preliminary voltage detection and evaluation before sending the request accept message. This preliminary action ensures accurate voltage measurement and proper evaluation of power delivery conditions, resolving the contradiction between measurement precision and delivery efficiency.
3Reliability
If waiting timers are added to manage power delivery timing, then PPS standards compliance is achieved, but the control procedure becomes more complex
Solution Approach 1:
The controller modifies timing parameters by introducing waiting timers with specific duration values into the power delivery control procedure. This parameter change ensures compliance with PPS standards while managing the complexity through standardized timing values.
Data Source
AI summary
A dongle coupled between a power supplying device for supplying power and a power receiving device for receiving power includes a downstream facing port (DFP), an upstream facing port (UFP) and a controller. The controller is arranged to control deliveries of the power and messages between the power supplying device and the power receiving device. In response to a first power request message received from the power receiving device, the controller is arranged to determine whether a power type request by the power receiving device is Programmable Power Supply (PPS) according to the first power request message. When determining that the power type request by the power receiving device is PPS, the controller is arranged to start first waiting timer, and when the first waiting timer expires, the controller is arranged to send a request accept message to the power receiving device through the UFP.