Charging Apparatus Voltage Control for Abnormal Waveforms
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Solution Overview
Problem
Existing charging apparatuses for hybrid, electric, and fuel cell vehicles face issues with power balance and stability when an abnormal voltage waveform is input, leading to potential overvoltage or overcurrent, which can cause failures and result in intermittent charging operations, insufficient charging power, and prolonged charging times.
Innovation Solution
A charging apparatus with a controller that adjusts charging power by controlling AC-DC and DC-DC converters stepwise to maintain output voltage within a predetermined range, ensuring power balance and preventing variations, thereby securing maximum charging power while protecting the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging power is supplied at normal levels when abnormal voltage waveform is detected, then charging efficiency is maintained, but power balance is lost and apparatus failure risk increases
Solution Approach 1:
The charging power is dynamically adjusted based on the detected output voltage from the AC-DC converter. When abnormal voltage waveform is detected, the controller automatically reduces charging power to maintain power balance, and restores normal charging power when voltage returns to reference range, thus adapting to changing conditions while maintaining both efficiency and reliability
Solution Approach 2:
The controller continuously monitors the output voltage from the AC-DC converter and uses this feedback to adjust charging power. When output voltage falls outside reference range, charging power is reduced; when voltage returns to normal, charging power is restored. This closed-loop feedback mechanism ensures power balance is maintained while preventing apparatus failure
2Reliability
If charging is temporarily stopped when output voltage falls outside reference range, then apparatus protection is achieved, but charging time increases significantly
Solution Approach 1:
Instead of completely stopping charging when abnormal voltage is detected, the system changes the charging power parameter to a reduced level. This allows charging to continue at a lower rate, maintaining apparatus protection while avoiding the time loss associated with complete charging interruption and subsequent restart delays
3Reliability
If intermittent charging operation is employed when abnormality continues, then apparatus protection is maintained, but sufficient charging power cannot be secured
Solution Approach 1:
The charging power is dynamically adjusted based on the detected output voltage from the AC-DC converter. When abnormal voltage waveform is detected, the controller automatically reduces charging power to maintain power balance, and restores normal charging power when voltage returns to reference range, thus adapting to changing conditions while maintaining both efficiency and reliability
Solution Approach 2:
Charging operation continues continuously without interruption even when abnormal voltage waveform is detected. The controller adjusts charging power levels to maintain power balance, ensuring that charging action remains continuous and useful rather than being repeatedly interrupted and restarted, thus securing sufficient charging power while protecting the apparatus
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 solution effectively stabilizes the charging process, ensuring sufficient charging power and reducing the risk of apparatus failure by maintaining power balance and preventing voltage variations, even under abnormal voltage waveforms, thus enhancing charging efficiency and reliability.
Implementation Method 1
a first conversion circuit that converts the alternating-current power supplied from the external power supply into direct-current power
Implementation Method 2
a second conversion circuit that converts an output voltage from the first conversion circuit into a voltage for the battery and supplies the voltage to the battery
Data Source
AI summary
A charging apparatus includes: a first conversion circuit that converts alternating-current power supplied from an external power supply into direct-current power; a second conversion circuit that converts an output voltage from the first conversion circuit into a voltage for a battery and supplies the voltage to the battery; and a controller configured to change charging power to be supplied to the battery by controlling the first conversion circuit and the second conversion circuit when the output voltage falls outside a predetermined reference range, and to determine whether the output voltage in the changed charging power falls within the reference range. When the output voltage falls outside the reference range, the controller controls the first conversion circuit and the second conversion circuit such that the charging power decreases stepwise until the output voltage falls within the reference range.