Charging Cable Circuit Switching for Type-A Fast Charging
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Solution Overview
Problem
The incompatibility between fast charging protocols and standard USB Type-A interfaces in charging circuits prevents devices from utilizing fast charging functions.
Innovation Solution
A charging circuit with a detection control module and switch module that connects or disconnects signal pins and ground/bus connections based on the compatibility of the charger and device, enabling fast charging when compatible and ordinary charging when not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a type-A interface without CC signal line is used for ordinary charging, then the interface is simple and compatible with standard chargers, but fast charging function cannot be realized
Solution Approach 1:
The patent implements dynamic switching between two charging modes: ordinary charging mode (type-A interface, ground connected to bus) and fast charging mode (CC signal line connected between first and second signal pins). The switch module dynamically reconfigures the circuit connections based on detection results, allowing the same physical interface to adapt to different charging protocols and achieve both simplicity and fast charging capability
Solution Approach 2:
The charging interface is designed to perform multiple functions: it can detect charger types, switch between ordinary and fast charging modes, and maintain compatibility with both type-A and type-C chargers. The detection control module and switch module enable the interface to universally support different charging protocols without requiring separate dedicated interfaces
2Productivity
If fast charging protocol is implemented requiring CC signal line, then fast charging function is achieved, but compatibility with type-A interface chargers is lost
Solution Approach 1:
The detection control module acts as an intermediary between the charger and the charging circuit. It detects the charger type through the CC signal line and controls the switch module to appropriately connect or disconnect the ground and signal pins. This intermediary mechanism enables automatic adaptation to different charger types, maintaining both fast charging capability and broad compatibility
Solution Approach 2:
The system dynamically adjusts its configuration based on real-time detection. When a fast charging charger is detected, the system switches to fast charging mode with appropriate signal pin connections. When a standard type-A charger is detected, it switches to ordinary charging mode with ground connected to bus, ensuring compatibility across different charger types while optimizing charging speed
3Ease of operation
If ground is connected to bus for ordinary charging, then standard charging function works, but fast charging cannot be enabled
Solution Approach 1:
The switch module dynamically changes the circuit configuration based on charging mode requirements. In ordinary charging mode, ground is connected to bus for standard operation. In fast charging mode, the switch module disconnects ground from bus and connects the first and second signal pins through the CC signal line, enabling high-power fast charging while maintaining ease of operation through automatic mode switching
Data Source
AI summary
A charging circuit and a charging cable. The charging circuit includes a first interface, a second interface, a detection control module, and a switch module. The first interface outputs a high-level signal through a first signal pin in a case of detecting that the first interface is plugged with a charger compatible with a fast charging protocol; and the detection control module controls the switch module to perform a preset operation in a case of detecting the high-level signal, so that the first signal pin and a second signal pin are connected, and ground and a bus are disconnected.