Intermediate Electronic Device for USB Power Delivery Safety
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Solution Overview
Problem
Conventional electronic devices with chip controllers are at risk of damage or burnout when operating under the high voltage conditions of the new USB Power Delivery specification, as they directly receive the high voltage as an enable signal, unlike the conventional 5V voltage in USB 2.0 and USB 3.0.
Innovation Solution
An intermediate electronic device with a controller and power transmission unit that detects connection status and informs the host system to raise voltage output only when necessary, outputting an enable signal to the controller instead of directly receiving high voltage, allowing safe operation and enabling power direction switching between host and external sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If USB power voltage is increased to 20V under the new USB Power Delivery specification, then power transmission capability is improved, but the chip controller may be damaged or burn out
Solution Approach 1:
The patent introduces a voltage detection circuit and control circuit as intermediary components between the USB power input and the chip controller. The voltage detection circuit detects the USB power voltage level, and the control circuit conditionally connects the USB power to the chip controller based on the detected voltage level. This intermediary mechanism allows the system to safely handle both 5V and 20V USB power scenarios, enabling high power transmission capability while protecting the chip controller from damage by preventing direct connection when voltage exceeds safe levels.
2Loss of time
If USB power voltage is increased to 20V, then charging time is decreased, but the enable signal transmission becomes unsafe
Solution Approach 1:
The patent employs a control circuit with switching elements (such as transistors or MOSFETs) that acts as an intermediary between the USB power line and the chip controller. The control circuit monitors the USB power voltage and conditionally activates the enable signal transmission to the chip controller only when the voltage is within safe limits (5V). When 20V is detected, the switching element remains off, blocking the harmful high voltage from reaching the chip controller. This resolves the contradiction by enabling fast charging from 20V power sources while protecting the controller through conditional signal transmission.
Solution Approach 2:
The patent utilizes voltage level detection as a parameter change trigger. The system detects the voltage parameter of USB power and changes its operational state accordingly: at 5V, the enable signal is transmitted normally to activate the chip controller; at 20V, the enable signal transmission is blocked. This parameter-based control mechanism allows the system to adapt its behavior based on the input voltage level, enabling fast charging capability while maintaining controller safety through dynamic parameter monitoring and response.
3Device complexity
If the chip controller directly receives USB power as enable signal, then the operation is simple, but the device is incompatible with high voltage USB Power Delivery
Solution Approach 1:
The patent implements a universal power interface design that can handle multiple voltage standards (5V and 20V) through a single USB power port. The voltage detection circuit and control circuit work together to provide universal compatibility: the system automatically detects whether the connected power source provides 5V or 20V and adjusts its operation accordingly. This multi-functional approach maintains operational simplicity for the user (single USB connection) while achieving broad voltage compatibility, allowing the device to work with both conventional USB power sources and high-power USB Power Delivery sources.
Solution Approach 2:
The control circuit serves as an intermediary layer that enables voltage compatibility without complicating the user interface. The user simply connects via USB as before, but the control circuit mediates between the variable voltage input and the fixed-voltage chip controller requirements. This intermediary mechanism provides adaptability to different voltage standards while maintaining the simplicity of USB connection operation, resolving the contradiction between operational simplicity and voltage compatibility.
Data Source
AI summary
An intermediate electronic device, arranged to be coupled to a host system and an electronic device. The intermediate electronic device includes: a controller, enabled by an enable signal to process the data transmission between the host system and the electronic device; and a power transmission unit disposed between the host system and the electronic device. The power transmission units detect whether the power transmission unit is coupled to the host system or an external power source. When the power transmission unit detects that the power transmission unit is coupled to the host system, but not coupled to the external power source, the power transmission unit informs the host system to raise the voltage output to the intermediate electronic device to supply power to the electronic device, and outputs the enable signal.