Firmware-Controlled USB Cable Voltage Drop Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hardware solutions for cable voltage compensation in power transfer systems are complex and costly, making it difficult to maintain reliable power supply to electronic devices due to voltage drops across cables.
Innovation Solution
A firmware-controlled integrated circuit (IC) solution dynamically tracks changes in cable current and voltage drop, using comparators and an analog-to-digital converter to adjust the source voltage, thereby compensating for voltage drops across the cable resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardware solutions are used for cable voltage compensation, then voltage drop across the cable can be compensated, but the system complexity and cost increase
Solution Approach 1:
The patent replaces complex hardware-based voltage compensation circuits with a firmware-controlled implementation. The microcontroller unit (MCU) executes compensation algorithms that calculate and adjust voltage levels based on measured cable characteristics, substituting mechanical/electrical hardware complexity with software-based control logic.
Solution Approach 2:
The system dynamically adjusts voltage compensation parameters based on real-time measurements of cable resistance and current. The firmware modifies compensation values adaptively according to changing operating conditions, allowing the system to maintain optimal performance across varying loads without requiring complex fixed hardware circuits.
2Reliability
If conventional hardware solutions are used for cable voltage compensation, then voltage drop across the cable can be compensated, but the system cost increases
Solution Approach 1:
The patent replaces expensive specialized hardware compensation circuits with standard microcontroller units running firmware. This substitution leverages the computational capabilities of general-purpose MCUs to perform voltage compensation calculations, eliminating the need for costly dedicated analog compensation hardware and reducing overall system manufacturing cost.
Solution Approach 2:
The system uses software-based modeling and calculation to simulate the effects of voltage compensation without requiring physical compensation hardware. The firmware creates a virtual model of the power delivery system and uses algorithms to determine appropriate compensation actions, replacing physical hardware copies with software representations.
3Device complexity
If firmware control is used for voltage compensation, then device complexity is reduced, but real-time response to changing cable current demands must be maintained
Solution Approach 1:
The firmware implements periodic measurement and adjustment cycles, where the microcontroller continuously monitors cable voltage and current at regular intervals. This periodic sampling approach maintains real-time responsiveness while allowing the system to operate efficiently between measurements, balancing speed requirements with computational overhead.
Solution Approach 2:
The system pre-calculates compensation values and maintains lookup tables of compensation parameters for different operating conditions. When voltage adjustment is needed, the firmware quickly retrieves pre-computed values rather than calculating from scratch, enabling fast response times while keeping the overall system complexity low.
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
This approach reduces complexity and cost by using software to manage voltage compensation, ensuring a stable power supply to electronic devices by dynamically adjusting the source voltage in response to changing cable current demands.
Implementation Method 1
analog-to-digital converter to generate a digital signal representative of the voltage on the voltage bus
Data Source
AI summary
An integrated circuit includes a processor coupled to a voltage bus of a cable and located within a universal serial bus (USB) compatible power supply device. A current sense amplifier (CSA) is coupled to a sense resistor to monitor a current of the voltage bus. A first comparator is coupled to the CSA and the processor and to trigger in response to detecting that a monitored current value from the CSA is greater than or equal to a first reference value, which includes a hysteresis offset value. An analog-to-digital converter (ADC) is coupled to the CSA and the processor. In response to detecting trigger of the first comparator, the processor is to trigger the ADC to measure an absolute current value of voltage bus, and cause an additional voltage, equal to a voltage drop across the cable based on the absolute current value, to be supplied to the voltage bus.