Dual USB Charging Circuit With Independent Port Mode Switching
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Solution Overview
Problem
Existing charging and discharging circuits for mobile electronic devices with dual USB ports face issues such as voltage differences causing damage to adapters and improper functioning when one port needs to charge while the other outputs signals.
Innovation Solution
A charging and discharging circuit with independent control mechanisms and paths for each USB port, utilizing a charging and discharging control circuit, switch circuits, and an identification logic circuit to manage charging and discharging modes and prevent reverse voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two or more USB ports are simultaneously supplying power to a system, then power supply capability is improved, but voltage difference causes reverse voltage that damages adapters
Solution Approach 1:
The identification logic circuit determines the operation mode (charging or discharging) of each USB port before power supply occurs. By detecting connection status and determining modes in advance, the control circuit can pre-configure the switch circuits to establish proper current paths, preventing reverse voltage before it occurs.
Solution Approach 2:
The charging and discharging control circuit acts as an intermediary between the USB ports and the system. It receives channel configuration signals from connection ports, determines operation modes, and controls switch circuits to manage current flow. This intermediary control mechanism ensures that power flows through proper paths and prevents direct reverse voltage conflicts between multiple USB ports.
2Adaptability or versatility
If one USB port charges the system and another outputs signals via USB OTG, then functional versatility is improved, but the later-plugged port fails to work properly
Solution Approach 1:
When a USB port is connected, the identification logic circuit immediately determines its operation mode based on the channel configuration signal. This preliminary determination allows the control circuit to prepare the appropriate switch configuration in advance, ensuring that when a second port is connected, both ports can be properly configured without conflict, regardless of connection order.
Solution Approach 2:
The switch circuits are dynamically controlled by the charging and discharging control circuit based on real-time connection status and operation modes. The system can adaptively change the conduction states of switch circuits in response to different connection scenarios, enabling flexible support for multiple functions (charging and OTG output) simultaneously without being constrained by connection sequence.
3Adaptability or versatility
If independent control mechanisms are implemented for each USB port, then independent charging/discharging capability is improved, but circuit complexity increases
Solution Approach 1:
The charging and discharging control circuit serves multiple functions: it receives channel configuration signals from different USB ports, determines operation modes for each port, controls multiple switch circuits, and manages both charging and discharging paths. This universal control circuit consolidates what could be multiple separate control mechanisms into a single multi-functional unit, reducing overall system complexity while maintaining independent control capability for each USB port.
Solution Approach 2:
The identification logic circuit combines the functions of detecting connection status and determining operation modes for multiple USB ports into a single integrated circuit. Similarly, the switch circuits are grouped and controlled together by the central charging and discharging control circuit. This merging approach allows independent control of each port's charging/discharging functionality while using shared control resources, thereby reducing the complexity that would result from completely separate control mechanisms for each port.
Data Source
AI summary
A charging and discharging circuit is provided, which includes a charging and discharging control circuit, a first connection port, a first switch circuit, a second switch circuit, a second connection port, a third switch circuit, a fourth switch circuit, and an identification logic circuit. The identification logic circuit determines a mode of the first connection port according to a first channel configuration signal of the first connection port, the charging and discharging control circuit switches the first switch circuit and the second switch circuit according to the mode of the first connection port, and the charging and discharging control circuit determines a mode of the second connection port according to a second channel configuration signal of the second connection port, so as to switch the third switch circuit and the fourth switch circuit.