Bidirectional Bus Voltage Control for Low-Loss Power Transfer
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Solution Overview
Problem
Power transmission loss occurs when electric power is transmitted between power transmission/reception units (power feeding systems), and existing technologies have not effectively addressed this issue to improve power transmission efficiency.
Innovation Solution
A power management device and method that include an acquisition unit to measure stored electric power, a control unit to switch operation modes of the power feeding system by controlling a converter, and a storage unit to store target voltage values for minimizing power transmission loss at different transmission power values. The control unit sets the power feeding system to a power reception mode when the stored electric power is low and to a power transmission mode when the stored electric power is sufficient, using the stored target voltage values to optimize power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric power is transmitted between power feeding systems, then power supply reliability is improved, but power transmission loss increases
Solution Approach 1:
The patent changes the operating parameters (voltage and current) of the power transmission system dynamically. By adjusting the external bus voltage to predetermined target values based on the transmission direction and power magnitude, the system optimizes transmission efficiency and reduces power loss while maintaining supply reliability.
Solution Approach 2:
The system dynamically switches between different operation modes (power reception mode and power transmission mode) based on real-time power conditions. The control unit determines the optimal mode and adjusts voltage parameters dynamically to minimize transmission loss while ensuring continuous reliable power supply.
2Productivity
If power transmission mode is used, then power supply efficiency is improved, but transmission loss increases at certain power levels
Solution Approach 1:
The patent stores multiple predetermined target values for external bus voltage corresponding to different transmission power levels. By selecting the appropriate target voltage based on the current transmission power magnitude, the system maintains high efficiency while minimizing transmission loss at various operating points.
Solution Approach 2:
The control unit continuously monitors the transmission power level and adjusts the external bus voltage to the appropriate target value. This feedback mechanism ensures that the system operates at optimal efficiency points while automatically compensating for transmission losses based on real-time conditions.
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 suppresses power transmission loss by optimizing the operation mode and target voltage settings of the power feeding system, thereby improving power transmission efficiency between connected systems.
Implementation Method 1
a converter capable of bidirectionally converting between an external bus voltage supplied to the external DC bus and an internal bus voltage supplied to an internal DC bus
Data Source
AI summary
A power management device includes a control unit that controls a converter capable of bidirectionally converting between an external bus voltage and an internal bus voltage in a first power feeding system. When an amount of stored electric power of the first power feeding system is less than a first storage threshold value, the control unit sets a target value of the external bus voltage to a first power reception target value corresponding to a first transmission power value in a first power transmission request transmitted to an upper power management device. When the amount of stored electric power exceeds a second storage threshold value, the control unit sets the target value of the external bus voltage to a first power transmission target value corresponding to a second transmission power value in a second power transmission request received from a second power feeding system.