Input-Voltage-Based Power Supply Control for Current Limiting
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Solution Overview
Problem
The increase in input current due to load fluctuations in vehicles can lead to battery exhaustion, damage to power supply routes, and excessive heat generation in power supply devices, particularly when using on-vehicle batteries as the power source.
Innovation Solution
A power supply control method and device that monitors input voltage to determine a maximum suppliable power value based on a predetermined input-output relationship, controlling output power to be equal to or less than this value, thereby reducing undesirable increases in input current. This involves a voltage converter, a power source voltage monitor, and a PD controller that adjusts the supply voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply device supplies power to the terminal device without controlling output power based on input voltage, then the terminal device can operate with sufficient power, but the input current increases excessively causing battery exhaustion and heat generation
Solution Approach 1:
The power supply device monitors the input voltage from the power source and uses this feedback to dynamically adjust the maximum suppliable power value. When input voltage decreases, the device automatically reduces output power to prevent excessive input current, creating a closed-loop control system that responds to real-time electrical conditions.
Solution Approach 2:
The patent implements dynamic power adjustment by dividing input voltage into multiple ranges (first to Nth ranges) and corresponding output power values. As input voltage fluctuates within these ranges, the device dynamically transitions between different power supply levels, making the power output adaptive rather than fixed.
2Use of energy by moving object
If the power supply device increases output power to meet terminal device demands, then the terminal device receives sufficient energy, but the input current increases causing damage to power supply routes
Solution Approach 1:
The monitoring mechanism continuously tracks input voltage and feeds this information back to the control logic. When input voltage drops below safe thresholds, the system automatically reduces power output to protect power supply routes from damage, ensuring reliable operation within safe electrical parameters.
Solution Approach 2:
The device pre-establishes multiple input voltage ranges and corresponding maximum suppliable power values before operation. This preliminary configuration allows the system to proactively adjust power output based on predicted voltage conditions, preventing damage before it occurs rather than reacting after damage has happened.
3Duration of action of moving object
If the power supply device maintains high output power despite low input voltage, then the terminal device can operate continuously, but excessive heat generation occurs in the voltage converter
Solution Approach 1:
The voltage converter dynamically adjusts its operation based on real-time input voltage conditions. By transitioning between different power supply modes corresponding to different voltage ranges, the device maintains continuous operation while adapting power levels to prevent thermal overload in the voltage converter.
Solution Approach 2:
The system changes the power output parameter in response to input voltage parameter changes. When input voltage decreases, the maximum suppliable power value is reduced accordingly, which directly reduces heat generation in the voltage converter while maintaining sufficient power for continuous terminal device operation.
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 effectively suppresses undesirable increases in input current, protecting the battery and power supply routes, while preventing excessive heat generation in the voltage converter, even when input voltage decreases.
Implementation Method 1
a voltage converter which converts input voltage from a power source to supply voltage based on a control signal
Data Source
AI summary
A method for controlling supply of power from a power source to a terminal device includes monitoring voltage inputted from the power source, and determining a maximum suppliable power on the basis of an input-output relationship that has been set in advance. Control is executed control so as to supply to the terminal device an output power equal to or lower than the maximum suppliable power. In the input-output relationship, first to N-th input voltage ranges IR1-IRN are set as input voltage ranges in an ascending order, and first to N-th output power values OP1-OPN are set as discrete values respectively corresponding to the first to N-th input voltage ranges in an ascending order. In the monitoring, one of the output power values corresponding to the input voltage range to which an input voltage from the power source belongs is determined as the maximum suppliable power value.