Input-Output Circuit Charger Detection Timing Control
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Solution Overview
Problem
The increasing variety of chargers and accessories for mobile devices, such as smartphones, leads to difficulties in accurately detecting the type of charger connected, resulting in potential erroneous charging due to shape mismatches, user insertion timing issues, or battery depletion, as charging currents are not uniformized.
Innovation Solution
An input-output circuit that includes a power supply detection circuit, a charger detection circuit monitoring voltages of differential data terminals, and a control unit to initiate charger kind detection after power feeding is detected, allowing precise recognition of charger types with low power consumption and minimal circuit scale increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charger detection is performed continuously or without timing control, then detection accuracy may improve, but power consumption increases
Solution Approach 1:
The charger detection circuit operates periodically based on timing signals from the control unit rather than continuously. The control unit generates timing signals that trigger detection cycles, allowing the system to balance detection accuracy with power conservation by activating the detection circuit only when needed.
Solution Approach 2:
The power supply detection circuit performs preliminary detection to determine whether power feeding is present before triggering the charger detection circuit. This preliminary action prevents unnecessary activation of the charger detection circuit when no power is being supplied, thereby reducing power consumption while maintaining detection accuracy when power is available.
2Measurement precision
If multiple detection circuits are added to improve detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The power supply detection circuit and charger detection circuit are integrated within the same input-output circuit block, sharing common components and control structures. This merging approach enables multiple detection functions to coexist without proportionally increasing overall circuit complexity, as the circuits share resources and are coordinated through a unified control unit.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the power supply detection circuit and the charger detection circuit. It receives signals from the power supply detection circuit and triggers the charger detection circuit accordingly, managing the interaction between multiple detection functions while maintaining system simplicity through centralized control.
3Speed
If charger detection is performed immediately upon connection, then detection speed improves, but detection accuracy deteriorates due to insertion timing issues
Solution Approach 1:
The power supply detection circuit performs preliminary detection to confirm that power feeding is actually present before triggering the charger detection circuit. This preliminary verification ensures that detection is performed at the appropriate time when the charger is properly connected and power is being supplied, avoiding premature detection that would occur immediately upon connection regardless of actual charging status.
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
Enables accurate recognition of charger types connected to mobile devices, preventing erroneous charging and power management issues while maintaining low power consumption and avoiding increased circuit complexity.
Implementation Method 1
a power supply detection circuit that detects power feeding to the power supply terminal from the outside
Implementation Method 2
a charger detection circuit that detects the kind of charger by monitoring voltages of the first data terminal and the second data terminal
Data Source
AI summary
A power supply detection circuit detects power feeding to a VBUS terminal from the outside. A charger detection circuit detects the kind of charger by monitoring voltages of a DP terminal and a DM terminal. A control unit adjusts timing and instructs the charger detection circuit to start a charger kind detection process after a notification of detection of power feeding is received from the power supply detection circuit.