Vehicle Backup Power Circuit With Parallel-Series Battery Switching
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Solution Overview
Problem
Existing backup power supply systems for moving vehicles face challenges in reducing noise and heat generated during voltage boosting and switching operations, especially when powering loads with varying minimum guaranteed operating voltages.
Innovation Solution
A backup power supply system that includes multiple power storage devices and a switching unit, which connects the devices in parallel during charging and in series during power failure, reducing the need for voltage boosting and transformer circuits, thus minimizing noise and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a boosting power supply circuit is used to supply power from a lithium-ion battery to loads, then power can be supplied when the main power supply fails, but the noise generated inside the boosting power supply circuit increases significantly
Solution Approach 1:
The system divides the power storage function into multiple separate power storage devices (first and second power storage devices) instead of using a single battery. This segmentation allows the circuit to switch between different connection configurations (parallel or series) depending on the operating condition, thereby avoiding the need for continuous high-voltage boosting operations that generate noise.
Solution Approach 2:
The system dynamically changes the electrical connection configuration between power storage devices based on operating conditions. The switching unit connects power storage devices in parallel during normal charging operation and in series during backup power supply operation. This dynamic reconfiguration allows the circuit to adapt to different voltage requirements without continuously operating the boosting circuit at high voltage, thereby reducing noise generation.
2Adaptability or versatility
If the boosting power supply circuit boosts voltage adaptively to meet higher minimum guaranteed operating voltage requirements, then all loads can be powered, but the voltage and current to be processed become so high that noise increases
Solution Approach 1:
The system changes the voltage parameter by altering the electrical connection configuration between power storage devices. Instead of continuously boosting voltage to meet different load requirements, the system switches between parallel connection (lower voltage) and series connection (higher voltage) configurations. This discrete parameter change approach provides voltage adaptation capability while avoiding the continuous high-voltage processing that generates noise.
Data Source
AI summary
A backup power supply system supplies power to one or more loads in a situation where a power supply has caused a failure. The backup power supply system includes a plurality of power storage devices and a switching unit. The plurality of power storage devices are charged by the power supply. The switching unit switches electrical connection between the plurality of power storage devices to either a first state where the plurality of power storage devices are connected to the power supply in parallel or a second state where the plurality of power storage devices are connected to each other in series. The switching unit switches the electrical connection to the first state while the plurality of power storage devices are being charged and switches the electrical connection to the second state when the power supply has caused the failure.