Bi-directional USB Charger with Buck-Boost Converter and Mode Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current USB charging systems are limited in their ability to efficiently manage bi-directional power flow and adapt to various operational modes, particularly in supporting different battery configurations and USB Power Delivery (PD) voltages, which can lead to inefficiencies and limitations in charging and powering electronic devices.
Innovation Solution
A bi-directional USB charger that incorporates a buck-boost converter functionality, allowing it to operate in both buck and boost configurations, and includes a controller to determine operational modes based on attached devices and voltage levels, enabling flexible power flow between a battery and a USB port, supporting various battery configurations and USB PD voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional USB charging system is used, then the system structure is simple, but the ability to manage bi-directional power flow and adapt to various operational modes is limited
Solution Approach 1:
The charger is designed to perform multiple functions including USB charging, battery charging, and power delivery in both directions. The system can operate in different modes (USB charge mode, battery charge mode, power delivery mode) depending on the connected device and battery state, making a single device serve multiple purposes that would traditionally require separate charging solutions
Solution Approach 2:
The charger dynamically switches between different operational modes based on real-time conditions. The controller determines the appropriate mode by detecting device type, voltage levels, and battery charge state, then adjusts the power flow direction and magnitude accordingly. This dynamic adaptation allows the system to optimize performance for each specific scenario
2Adaptability or versatility
If USB Power Delivery voltages are supported, then the adaptability to different devices is improved, but the control complexity increases
Solution Approach 1:
The system continuously monitors voltage levels at both the USB port and battery port, detecting device type and battery charge state. Based on this feedback information, the controller automatically determines the appropriate operational mode and adjusts power delivery parameters. This closed-loop control simplifies the management of complex USB PD voltage negotiations and battery charging profiles
Solution Approach 2:
The charger adjusts electrical parameters (voltage, current, power flow direction) based on detected conditions. When USB PD devices are detected, the system negotiates and switches between different voltage levels (5V, 12V, 20V) as needed. The controller modifies these parameters dynamically to match device requirements and battery charging needs, managing complexity through automated parameter adjustment
3Productivity
If bi-directional power flow is enabled, then the productivity and flexibility of charging operations is improved, but the energy loss may increase
Solution Approach 1:
The system dynamically optimizes power flow to minimize energy losses. By continuously monitoring battery charge state and device power requirements, the controller adjusts the direction and magnitude of power flow in real-time. This ensures power is delivered efficiently from the optimal source (USB port or battery) to the required destination, reducing unnecessary energy conversion and transmission losses
Data Source
AI summary
A bi-directional charger may be provided that includes a logic, at least a portion of which is hardware, to determine an operational mode based at least on a characteristic at a battery port or at a charge port, and to control power flow between the charge port and the battery port based on the determined operational mode.