Battery Switching Power Supply Control for Inrush Current Suppression
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Solution Overview
Problem
Existing power supply systems face challenges in minimizing the risk of inrush current when the number of storage batteries connected to high-voltage circuits changes, requiring measures to suppress such currents.
Innovation Solution
A power supply system with switches and controllers that manage the connection of electrical accumulators to high-voltage and low-voltage circuits, using inverters and smoothing capacitors to step-up or step-down voltage levels, thereby controlling the risk of inrush current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of storage batteries connected to the high-voltage circuit is changed, then the voltage level of the high-voltage circuit can be adjusted, but inrush current occurs during the switching process
Solution Approach 1:
The neutral point connecting switch is operated in advance to connect the motor neutral point to the high-voltage circuit before the main battery switching operation. This preliminary action creates a controlled path that prevents inrush current when changing the number of connected storage batteries. The switch controller coordinates this preliminary switching action to occur before the actual battery connection change.
Solution Approach 2:
The motor neutral point acts as an intermediary element between the storage batteries and the high-voltage circuit. By connecting the neutral point through the neutral point connecting switch, the system creates an intermediate connection path that allows safe switching of battery connections without causing inrush current to flow directly through the circuit.
2Adaptability or versatility
If switches are used to selectively connect electrical accumulators to high-voltage and low-voltage circuits, then flexible power management is achieved, but system complexity increases
Solution Approach 1:
The motor serves multiple functions: it acts as the drive motor for the vehicle, and simultaneously its neutral point serves as a switching node for connecting storage batteries to the high-voltage circuit. The inverter also performs dual functions as the power converter for motor control and as a switching mechanism for battery connection management. This multi-functionality reduces the need for dedicated switching components.
Solution Approach 2:
The patent combines the battery switching function with the existing motor control system. The neutral point connecting switch is integrated into the motor control circuitry, and the inverter controller handles both motor control and battery switching operations. This merging of functions consolidates control logic and reduces overall system complexity despite the flexible power management capabilities.
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 system effectively minimizes the risk of inrush current by dynamically managing the connection of batteries, ensuring stable voltage levels across capacitors and reducing the likelihood of current surges.
Implementation Method 1
an inverter controller which, when the switch controller switches between on- and off-states of the first X-switch, the first Y-switch, the second X-switch, the second Y-switch, the third X-switch, the third Y-switch, and/or the neutral point connecting switch to change the number of the electrical accumulator which are to be connected to the high-voltage power supply line, works to control an operation of the inverter to step-up or step-down voltage inputted to the motor and the inverter by means of the motor and the inverter
Implementation Method 2
The high-voltage power supply line and the high-voltage ground line have a first smoothing capacitor (21) which is disposed therebetween and electrically connected thereto in parallel to the inverter. The motor has a neutral point which connects with the high-voltage ground line through a second smoothing capacitor.
Data Source
AI summary
A power supply system includes an inverter controller which, when switches are turned on or off to change the number of storage batteries which are to be electrically connected to a high-voltage power supply line, works to step-up or step-down voltage, as inputted to a motor and an inverter, by means of the motor and the inverter to control the level of voltage developed across terminals of a first smoothing capacitor.