Power Delivery Control Chip for Dynamic Cable Resistance Compensation
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Solution Overview
Problem
Different charging cables age at varying rates due to differences in specifications and materials, making it challenging to ensure accurate and safe charging of electronic devices.
Innovation Solution
A charger equipped with an AC/DC conversion circuit and a power delivery control chip that calculates equivalent resistances along the power supply bus using voltage sensing signals from chips at both ends of the cable, adjusting the charging voltage to maintain a target voltage despite changes in cable resistance due to aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging is performed using a fixed voltage and current without cable monitoring, then the charging process is simple, but the charging accuracy and safety deteriorate due to cable aging and resistance changes
Solution Approach 1:
The patent implements feedback control by continuously monitoring the voltage sensing signals from both ends of the cable, calculating the equivalent resistance, and adjusting the charging voltage accordingly. The power delivery control chip receives voltage sensing signals from the first chip at the electronic device end and the second chip at the charger end, calculates the equivalent resistance of the power supply bus, and dynamically adjusts the charging voltage to maintain accurate charging despite cable aging.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically detecting cable resistance changes and compensating for them without user intervention. The power delivery control chip autonomously calculates the equivalent resistance based on voltage sensing signals and adjusts the charging parameters accordingly, enabling the system to adapt to cable aging conditions on its own.
2Productivity
If the charging voltage is increased to compensate for cable resistance, then the charging current can be maintained, but the risk of overheating and damage increases
Solution Approach 1:
The system uses feedback control to dynamically adjust the charging voltage based on the calculated equivalent resistance. By continuously monitoring the voltage sensing signals and recalculating the equivalent resistance during charging, the system can increase voltage only when and where needed to compensate for measured resistance changes, rather than applying a fixed high voltage that would cause overheating.
Solution Approach 2:
The patent dynamically changes the charging voltage parameter based on the calculated equivalent resistance. The power delivery control chip adjusts the voltage output according to the real-time cable condition, optimizing the balance between maintaining charging current and preventing excessive voltage that could cause overheating.
3Measurement precision
If equivalent resistance calculation is performed using voltage sensing signals from both ends of the cable, then the resistance measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the voltage sensing function into two separate locations: a first chip at the electronic device end and a second chip at the charger end. Each chip independently measures the voltage at its location, and the power delivery control chip uses both measurements to calculate the equivalent resistance of the power supply bus, improving measurement accuracy through distributed sensing.
Solution Approach 2:
The system combines the voltage sensing data from both ends of the cable to calculate the equivalent resistance. By merging the information from the first voltage sensing signal and the second voltage sensing signal, the system achieves more accurate resistance measurement than single-point sensing would provide.
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
Ensures accurate and safe charging by continuously monitoring and adapting to changes in cable resistance, preventing overheating and damage from excessive current.
Implementation Method 1
The AC/DC conversion circuit is coupled to a power supply bus of the cable to covert an AC voltage into a DC voltage, so as to provide a charging voltage and a charging current
Implementation Method 2
The power delivery control chip calculates a first equivalent resistance according to a first voltage sensing signal provided from a first chip of the first connector, a current charging voltage, and a current charging current
Data Source
AI summary
A charger and a power delivery control chip and a charging method thereof are provided. Resistance values of equivalent resistances corresponding to a power supply bus are calculated according to a charging current and voltage sensing signals respectively provided by chips of a first connector and a second connector. A charging voltage supplied to the power supply bus is adjusted according to a target charging voltage, a current charging current, and variations of the resistance values of the equivalent resistances corresponding to the power supply bus.