Dual Integrated Gate Driver for USB-C Reverse Current Protection
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Solution Overview
Problem
Existing USB power delivery systems face challenges in providing effective fault protection, particularly reverse current protection and short circuit protection, which can lead to increased costs and complexity due to the need for separate gate drivers and higher-cost FETs, resulting in higher bill of material costs and larger board sizes.
Innovation Solution
A dual-integrated gate driver is implemented on a USB-C controller, capable of providing fault protection up to 20V, allowing the use of cheaper FETs while maintaining system-level fault handling, including reverse current protection, short circuit protection, over-current protection, and over-voltage protection, by driving two external power FETs in series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate gate drivers are used for each power FET, then fault protection is provided, but device complexity and bill of material costs increase
Solution Approach 1:
The patent combines two separate gate drivers into a single dual-integrated gate driver that controls both power FETs. This integration reduces the number of discrete components, simplifies the circuit architecture, and lowers bill of material costs while maintaining comprehensive fault protection capabilities including reverse current protection and short circuit protection.
Solution Approach 2:
The dual-integrated gate driver performs multiple functions: driving two power FETs in series, providing reverse current protection, providing short circuit protection, and enabling over-current protection. This multi-functional design eliminates the need for separate dedicated protection circuits, reducing overall system complexity while enhancing reliability.
2Reliability
If higher-cost FETs are used for fault protection, then reliability is improved, but bill of material costs increase
Solution Approach 1:
The system uses inexpensive power FETs that rely on the dual-integrated gate driver's built-in protection mechanisms rather than requiring inherently more expensive FETs with built-in protection. The gate driver actively monitors and protects the FETs, allowing the use of cost-effective FET components while maintaining high reliability through the intelligent protection circuitry.
3Reliability
If separate protection circuits are added, then fault protection is enhanced, but board size increases
Solution Approach 1:
The patent integrates reverse current protection, short circuit protection, and FET driving functionality into a single dual-integrated gate driver IC. This consolidation eliminates the need for separate protection circuits that would occupy additional PCB real estate, thereby reducing board size while maintaining comprehensive fault protection capabilities.
4Reliability
If additional logic and circuits are added for fault protection, then reliability is improved, but device complexity increases
Solution Approach 1:
The dual-integrated gate driver is designed as a multi-functional device that provides FET driving, reverse current protection, short circuit protection, and over-current protection within a single integrated circuit. This universal design approach consolidates multiple protection functions into one component, reducing overall device complexity compared to implementing each function with separate logic and circuits.
Data Source
AI summary
A dual-integrated gate-driver with reverse current protection (RCP) fault protection is described. A Universal Serial Bus Type-C (USB-C) controller includes a first terminal, a second terminal, and a dual-gate driver. The dual-gate driver drives a first power field effect transistor (FET) coupled to the first terminal and a second power FET coupled to the second terminal. The first power FET and the second power FET are connected in series between a voltage bus (VBUS_C) terminal of a USB Type-C connector and a voltage supply to deliver power to the VBUS_C terminal. A breakdown voltage of each of the first power FET and the second power FET is less than 20 volts. The dual-gate driver controls the first power FET and the second power FET in response to at least one of a short circuit event or a reverse current event.