USB Port Terminating Resistor Circuit with Energy Storage Control
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Solution Overview
Problem
Existing USB port technologies lack a detailed specification for implementing pull-down resistors during configuration detection periods, limiting the selection of terminating switches to low-voltage elements and affecting the efficiency of configuration detection.
Innovation Solution
A terminating resistor circuit with a terminating switch and energy storage control circuit is used, where the switch is turned on using stored electrical energy to pull down the configuration channel pin voltage, allowing for the selection of switches beyond low-voltage elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pull-down resistor is used during configuration detection period, then the configuration channel pin voltage can be pulled down to low potential, but the selection of terminating switch is limited to low-voltage elements
Solution Approach 1:
The energy storage control circuit pre-charges a capacitor during the charging period before the discharging period begins. This preliminary energy storage enables the capacitor to provide sufficient voltage to turn on the terminating switch during the discharging period, allowing the use of high-voltage switches instead of being limited to low-voltage elements.
Solution Approach 2:
The configuration detection period is divided into distinct charging and discharging periods. During the charging period, the capacitor accumulates energy while the terminating switch remains off. During the discharging period, the capacitor releases energy to turn on the terminating switch. This periodic alternation ensures reliable configuration detection while enabling versatile switch selection.
2Productivity
If the terminating switch is turned on during configuration detection period, then the voltage of configuration channel pin is pulled down, but the charge of configuration channel pin is depleted
Solution Approach 1:
The capacitor serves as an intermediary energy storage element between the configuration channel pin and the terminating switch. During the charging period, the capacitor accumulates charge from the configuration channel pin. During the discharging period, the capacitor provides the necessary charge to turn on the terminating switch, thereby protecting the configuration channel pin from direct charge depletion and enabling efficient configuration detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient configuration detection by using stored energy to control the terminating switch, reducing the dependency on low-voltage elements and enhancing the USB port's ability to determine device roles during configuration detection periods.
Implementation Method 1
a capacitor stores charge from the configuration channel pin to obtain a stored electrical energy
Implementation Method 2
During a discharging period in the configuration detection period, the energy storage control circuit turns on the terminating switch by using the stored electrical energy
Data Source
AI summary
A terminating resistor circuit of a USB port and an operation method thereof are provided. The terminating resistor circuit includes a terminating resistor, a terminating switch, and an energy storage control circuit. The terminating resistor and the terminating switch are connected in series between a configuration channel pin of the USB port and a first reference voltage, and the energy storage control circuit is coupled to a control end of the terminating switch. During a charging period in a configuration detection period, the energy storage control circuit stores charge from the configuration channel pin to obtain a stored electrical energy, and during a discharging period in the configuration detection period, the energy storage control circuit turns on the terminating switch by using the stored electrical energy.