Micro USB ID Pin Diode Isolation for Type-C Voltage Protection
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Solution Overview
Problem
Devices with micro USB interfaces can be damaged when connected to devices with Type C USB interfaces via conversion lines, due to voltage mismatch between the VBUS and ID pins, leading to potential damage.
Innovation Solution
Incorporating a diode in the line between the CPU's ID pin and the micro USB interface's ID pin, with a pull-up circuit and optional resistors to isolate the VBUS voltage and protect the CPU, ensuring the ID pin voltage remains at a safe level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conversion line connects Type C USB interface to micro USB interface, then data transmission compatibility is improved, but voltage mismatch causes damage to the micro USB device
Solution Approach 1:
A diode is introduced as an intermediary component in the ID pin connection line between the micro USB interface and the CPU. The diode's anode connects to the micro USB interface ID pin and its cathode connects to the CPU ID pin through a pull-up circuit. This intermediary component allows normal data transmission while blocking harmful reverse voltage from the Type C interface from reaching the micro USB interface, thus solving the voltage mismatch problem without compromising compatibility.
2Power
If VBUS and CC1 are connected in Type C interface, then power supply function is improved, but reverse voltage damages the micro USB interface ID pin
Solution Approach 1:
The patent converts the potentially harmful reverse voltage scenario into a beneficial protective mechanism. When the Type C interface connects with VBUS and CC1, the diode in the ID pin line becomes reverse-biased and blocks the reverse voltage, preventing damage to the micro USB interface. The normal forward voltage for ID detection still passes through, maintaining functionality. This transforms a harmful voltage mismatch situation into a protected state.
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
Prevents damage to the electronic device by isolating the VBUS voltage from the CPU's ID pin, protecting it from excessive voltage and enhancing recognition rates through controlled voltage division.
Implementation Method 1
a diode, wherein a pull-up circuit of an ID pin of the CPU is connected to a line between the ID pin of the CPU and an ID pin of the micro USB interface; the diode is provided in the line between the ID pin of the CPU and the ID pin of the micro USB interface, and is positioned between the pull-up circuit and the ID pin of the micro USB interface; and the diode has a conducting direction pointing from the ID pin of the CPU to the ID pin of the micro USB interface
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to an electronic device and a data transmission system. A first electronic device includes a USB interface (1), a CPU (2) and a diode (3), wherein a pull-circuit (4) of an ID pin (21) of the CPU (2) is connected to a line between the ID pin (21) of the CPU (2) and an ID pin (11) of the micro USB interface (1); the diode (3) is provided in the line between the ID pin (21) and the ID pin (11), and is positioned between the pull-up circuit (4) and the ID pin (11) of the micro USB interface (1); the diode (3) has a conducting direction pointing from the ID pin (21) to the ID pin (11).