Battery Pack Switching Control for Constant Voltage Output
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Solution Overview
Problem
Existing power supply devices with multiple batteries struggle to maintain constant power output when switching between series and parallel connections, leading to inefficiencies and increased size and cost due to fixed connection configurations.
Innovation Solution
A power supply device with a control unit that dynamically switches the connection between first and second battery units to series or parallel configurations based on voltage values, using a switching unit and detection unit to ensure constant voltage output by adjusting the connection type when voltage values are above or below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed series or parallel connection configuration is used for multiple batteries, then the device structure is simple, but the power supply device cannot maintain constant power output when battery voltage fluctuates
Solution Approach 1:
The patent applies dynamics by making the battery connection configuration changeable rather than fixed. The switching unit dynamically reconfigures the connection between first and second battery units between series and parallel based on real-time voltage detection, allowing the system to adapt to varying battery states and maintain constant power output.
Solution Approach 2:
The patent implements feedback through the detection unit that continuously monitors battery voltage and provides this information to the control unit. The control unit uses this feedback to determine when to switch between series and parallel connections, creating a closed-loop control system that maintains constant power output.
2Reliability
If a DC/DC converter with high boosting ratio is used to maintain constant voltage output, then the constant voltage output is maintained, but the device size and cost increase
Solution Approach 1:
The patent reduces the required boosting ratio of the DC/DC converter by dynamically switching between series and parallel battery connections. When battery voltage drops, switching to series connection increases the input voltage to the converter, reducing the boosting ratio needed and thereby reducing the converter's size and cost.
Solution Approach 2:
The patent changes the electrical parameters (voltage and current distribution) by switching between series and parallel battery configurations. This parameter change optimizes the input conditions for the DC/DC converter, allowing for a smaller, more cost-effective converter design while maintaining constant output voltage.
3Power
If more batteries are used to ensure sufficient power output, then the power availability is improved, but the device size, weight, and cost increase
Solution Approach 1:
The patent uses dynamic switching between series and parallel battery connections to maximize power output from a fixed number of batteries. By configuring the connection based on voltage levels, the system efficiently utilizes the available battery capacity, eliminating the need for additional batteries that would increase weight.
Data Source
AI summary
A power supply device for outputting a constant voltage to a load, including a power supply unit that has a first battery unit including at least one battery and a second battery unit including at least one battery, a switching unit configured to switch connection between the first battery unit and the second battery unit to series connection or parallel connection, and a control unit configured to control the switching unit so that a voltage set value set in advance according to a specification required by the load is supplied to the load, wherein the control unit controls the switching unit so that the connection between the first battery unit and the second battery unit is the parallel connection, when a first voltage value that is a value of a voltage output from the first battery unit and a second voltage value that is a value of a voltage output from the second battery unit are equal to or larger than a predetermined switching voltage value, and controls the switching unit so that the connection between the first battery unit and the second battery unit is the series connection, when the first voltage value and the second voltage value are not equal to or larger than the switching voltage value is provided.