Power Supply Control Apparatus Voltage Variation Correction
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Solution Overview
Problem
In vehicular power supply systems, it is challenging to set high, intermediate, and low voltage power supply voltages to their respective target values due to their interrelated nature during voltage conversion operations, especially when these voltages vary with temperature and power consumption.
Innovation Solution
A power supply control apparatus that includes a variation amount acquisition section and a correction section to detect and correct voltage variations in high, intermediate, and low voltage power supply devices by controlling a DC-DC converter, using detection sections to monitor and estimate voltage variations and adjust the converter to maintain target voltage values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual voltage correction is applied to high voltage, intermediate voltage and low voltage, then voltage regulation precision is improved, but control complexity increases due to interrelated nature of voltages
Solution Approach 1:
The control system segments voltage correction into three independent correction sections, each handling one voltage level (high, intermediate, low). Each section independently acquires voltage variation amounts and applies corrections without interfering with others, thereby maintaining precision while reducing control complexity through functional decomposition.
Solution Approach 2:
The system implements feedback control by continuously acquiring voltage variation amounts from detection sections and using these feedback signals to adjust DC-DC converter output. This closed-loop feedback mechanism enables automatic voltage regulation that maintains precision while simplifying control through automated adjustment based on real-time measurements.
2Measurement precision
If DC-DC converter controls all voltage levels independently, then voltage regulation accuracy is improved, but heat generation increases due to excessive conversion operations
Solution Approach 1:
The control system dynamically adjusts DC-DC converter operation based on real-time voltage variation amounts. When voltage variations are within acceptable ranges, conversion operations are reduced or suspended. When variations exceed thresholds, conversion operations are activated only for affected voltage levels, thereby maintaining accuracy while minimizing heat generation through adaptive, condition-based 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
The apparatus effectively controls power supply voltages to maintain accurate target values, reducing heat generation in the DC-DC converter and ensuring precise voltage regulation, which helps in maintaining optimal fuel injection and ignition timings in hybrid vehicles.
Implementation Method 1
The low voltage power supply device is charged by lowering the high voltage of the high voltage power supply device by a DC-DC converter
Implementation Method 2
a DC-DC converter is used to convert a high voltage of a high voltage power supply device or a low voltage of a low voltage power supply device to an intermediate voltage, which is between the high voltage and the low voltage
Data Source
AI summary
A power supply control apparatus monitors a high voltage, an intermediate voltage and a low voltage and detects voltage variation amounts of those voltages. When an absolute value of the voltage variation amount is greater than a predetermined variation amount, the power supply control apparatus corrects the voltage of large variation by controlling a DC-DC converter based on the voltage variation amount. The power supply control apparatus further estimates voltage variation amounts of the voltages other than the voltage of large variation based on the voltage variation amount of large variation and corrects the voltage of estimated large variation by controlling the DC-DC converter based on the estimated voltage variation amount.