USB-C VCONN Switch Overcurrent Protection IC
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Solution Overview
Problem
USB Type-C connector systems face challenges in protecting against overcurrent and overvoltage damage due to electrical faults, which can cause damage to Field Effect Transistors (FETs) and other components.
Innovation Solution
Incorporating an overcurrent component within the USB controller's integrated circuit (IC) that detects excessive current and automatically shuts off the VCONN switch to prevent electrical and thermal damage, using on-chip circuitry to reduce resistance and enhance power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external sensing resistors are used to detect overcurrent conditions, then overcurrent protection is achieved, but device cost and complexity increase
Solution Approach 1:
The patent merges the overcurrent detection function into the USB controller's integrated circuit by incorporating sensing circuitry directly into the chip. This integration eliminates the need for external sensing resistors and reduces the overall system complexity while maintaining overcurrent protection capability. The sensing circuit is combined with the switch control logic within the same IC package.
Solution Approach 2:
The patent extracts the overcurrent detection and switch control functionality from external discrete components and relocates it entirely within the USB controller IC. This extraction of protective functions into the main controller reduces the bill of materials and simplifies the external circuitry required for overcurrent protection.
2Loss of energy
If on-chip circuitry is used to reduce resistance, then power efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions (overcurrent sensing, switch control, and power management) into a single integrated circuit. This merging reduces the total resistance in the power path by eliminating external connection points and solder joints, thereby improving power efficiency despite the increased complexity of IC fabrication.
3Power
If VCONN switch is used to provide power, then power delivery is enabled, but susceptibility to electrical damage increases
Solution Approach 1:
The patent implements a feedback mechanism where the sensing circuit continuously monitors the current through the VCONN switch and provides real-time information to the control logic. When overcurrent conditions are detected, the system automatically responds by adjusting or disconnecting the switch, creating a closed-loop control system that protects against electrical damage while enabling power delivery.
Solution Approach 2:
The patent applies preliminary protective action by incorporating overcurrent detection and automatic switch disconnection capabilities before electrical damage can occur. The sensing circuit is designed to detect abnormal current conditions and trigger protective measures in advance, preventing damage to the VCONN switch and other components.
Data Source
AI summary
An electronic device includes a first switch configured to connect a VCONN supply terminal of a Universal Serial Bus Type-C (USB-C) controller to a first configuration channel (CC) terminal of the USB-C controller in response to a USB-C connector being in a first orientation. A first current may flow through the first switch. The electronic device also includes an overcurrent component coupled to the first switch. The overcurrent component includes a second switch associated with the first switch. The second switch has a second current associated with the first current. The overcurrent component is configured to determine whether the first current is greater than a threshold current based on the first current and the second current. The overcurrent component is also configured to close the first switch in response to determining that the first current is greater than the threshold current.