Battery Charger Controller Dynamics for Power Failure Driving Time
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Solution Overview
Problem
Existing battery charging systems for environmentally-friendly vehicles face challenges in maintaining a stable driving state during instantaneous power failures, leading to potential malfunctions and increased costs due to the need for larger capacitors to extend the minimum driving time.
Innovation Solution
The system includes a controller that determines the presence of charger input voltage and adjusts the output current or power of the DC-DC converter to limit it when the input voltage is not generated, thereby extending the driving time and reducing the capacitor capacity needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the capacitor capacity is increased to extend the minimum driving time during power failure, then the driving time is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the output current of the DC-DC converter variable rather than fixed. The controller dynamically adjusts the output current based on the power failure detection, reducing it to a predetermined level to extend the driving time. This dynamic adjustment allows the system to adapt to different operating conditions without requiring oversized capacitors.
Solution Approach 2:
The patent changes the parameter of output current from a constant value to a variable value that depends on the operating condition. When power failure is detected, the output current is changed to a predetermined reduced level, which extends the driving time. This parameter change resolves the contradiction by allowing the system to maintain adequate performance with smaller capacitors.
2Duration of action of moving object
If the output current is reduced during power failure, then the driving time is extended, but the output power decreases
Solution Approach 1:
The patent applies partial action by reducing the output current to a predetermined level rather than completely shutting down or maintaining full output. This partial operation allows the system to extend driving time while still providing sufficient power for essential functions during the power failure period.
Solution Approach 2:
The system dynamically adjusts the output current based on the detected power failure condition, transitioning from normal operating current to a reduced predetermined current. This dynamic response allows the system to optimize between driving time extension and maintaining adequate output power for essential operations.
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 stabilizes the charger operation during power failures, prevents inefficient re-operation sequences, and allows for a smaller capacitor design, reducing costs while ensuring a minimum stable driving time.
Implementation Method 1
a first capacitor (4) connected to an output terminal of the PFC converter (10) to smooth an output of the PFC converter (10)
Implementation Method 2
a second capacitor (50) connected to an output of the DC-DC converter (20) to smooth an output of the DC-DC converter (20)
Data Source
AI summary
A battery charging system using a charger and a driving control method of the charger thereof are provided which increase a driving time of the charger when an instantaneous power failure of charger input voltage occurs in the battery charging system. Thus, a sufficient time is secured for obtaining and processing more precise information regarding a driving state of the charger and the capacity of a capacitor is decreased compared to the related art.