USB Converter Load Current Estimation via Voltage Feedback
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Solution Overview
Problem
Traditional USB interface chargers cannot accurately inform the output power capability to loads, leading to potential damage and inefficient conversion when converting different USB types, especially with the rise of intelligent power supply modes based on the C-type USB interface.
Innovation Solution
A method and device for estimating the load current of a power supply through a USB connection line, which adjusts the initial load current until the actual voltage meets a preset value, preventing overload and enabling intelligent charging by monitoring and adjusting the voltage and current in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interface form conversion is performed to convert different USB interfaces to C-type USB interface, then interface compatibility is improved, but the output capability information cannot be accurately transmitted to the electrical appliance, resulting in loss of information
Solution Approach 1:
The patent implements a feedback mechanism where the converter actively detects the power supply capability of the connected adapter and communicates this information back to the electrical appliance. This is achieved through real-time monitoring of voltage and current parameters, and dynamically adjusting the conversion process based on the detected power supply characteristics, thereby preventing information loss about output capability
Solution Approach 2:
The converter performs self-detection and self-assessment of the connected power supply's output capability without requiring external intervention. By autonomously measuring voltage and current parameters and determining the power supply capability, the system eliminates the need for manual configuration or pre-programmed information, thus preventing information loss through automated self-service
2Productivity
If the converter provides power without accurate load current estimation, then power delivery speed is improved, but the adapter may be damaged due to overload
Solution Approach 1:
The patent implements preliminary action by performing load current estimation and power supply capability detection before actual power delivery begins. The converter pre-assesses the adapter's output capability through voltage and current detection, and establishes safe operating parameters in advance, thereby preventing adapter damage while enabling rapid subsequent power delivery
Solution Approach 2:
The patent applies skipping by rapidly completing the power supply capability detection and load current estimation process through optimized measurement circuits and algorithms. The detection phase is executed quickly to minimize delay, allowing the system to transition rapidly to full power delivery while still ensuring adapter safety through the preliminary assessment
3Adaptability or versatility
If traditional USB interface chargers are eliminated in favor of C-type USB interface based intelligent power supply mode, then intelligent charging capability is improved, but a great amount of social stock resources will be wasted
Solution Approach 1:
The patent applies universality by designing a converter that can work with multiple types of USB adapters (both traditional and C-type) as input, while providing standardized C-type USB output. This multi-functionality allows the system to utilize existing diverse adapter resources effectively, reducing waste while achieving intelligent charging capability through the conversion process
Data Source
AI summary
Disclosed are a method for estimating a load current of a power supply, and a USB-type converter. The method includes steps described below. After an input port of a USB connection line is connected to the power supply and an output port of the USB connection line is connected to a load, the power supply supplies power to the load through the USB connection line to obtain an initial load current value; an actual voltage value of the input port is detected, when the actual voltage value of the input port is less than a preset voltage value, the initial load current value is adjusted until the actual voltage value of the input port corresponding to an adjusted load current value is not less than the preset voltage value, and the adjusted load current value is output as a load current value of the power supply.