Integrated DC Stabilizer and Motor Driver for Voltage Oscillation Control
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Solution Overview
Problem
Direct current (DC) distribution systems experience voltage instability during transient periods when loads are connected or removed, leading to inefficiencies and increased production costs due to conventional stabilization devices being separate from the system.
Innovation Solution
A device integrated within the load, comprising a capacitor unit, inverter unit, voltage stabilization unit, switching unit, and control unit, which selectively enables the inverter or voltage stabilization circuit to stabilize DC voltage by charging or discharging capacitors based on voltage comparisons, thereby reducing voltage oscillations and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage stabilizers are configured separately from loads, then voltage stabilization function is provided, but operation efficiency is low and production cost is high
Solution Approach 1:
The patent combines the voltage stabilization function with the motor driver into a single integrated device. The motor driver includes a DC-DC converter that can operate in voltage stabilization mode by comparing system voltage with a reference voltage and adjusting the output accordingly, eliminating the need for separate stabilizer equipment.
Solution Approach 2:
The motor driver is designed to perform multiple functions: it can drive motors normally and simultaneously provide voltage stabilization to the DC distribution system. The same DC-DC converter circuit serves both motor control and voltage regulation purposes, improving operational efficiency and reducing costs.
2Reliability
If conventional voltage stabilizers are configured separately from loads, then voltage stabilization function is provided, but production cost is high
Solution Approach 1:
The patent merges the voltage stabilization function with the motor driver, eliminating the need for separate stabilizer equipment. This integration reduces component count, simplifies manufacturing, and lowers overall system cost while maintaining voltage stabilization capability.
Solution Approach 2:
The motor driver is designed to perform dual functions: motor control and voltage stabilization. By making the motor driver universal, the system eliminates redundant components and reduces production costs without sacrificing voltage stabilization performance.
3Productivity
If the device stabilizes DC power supply, then system efficiency degradation is reduced, but requires integrated circuit design complexity
Solution Approach 1:
The DC-DC converter is designed to operate in multiple modes (motor driving mode and voltage stabilization mode) using the same hardware circuitry. The control unit switches between modes based on system conditions, achieving high system efficiency without requiring entirely separate circuits for each function.
Solution Approach 2:
The device dynamically switches between motor driving operation and voltage stabilization operation based on real-time system voltage conditions and load requirements. This dynamic adaptability allows the same circuit to optimize system efficiency under varying operating conditions without permanent structural complexity.
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 stabilizes DC power supply, reduces system efficiency degradation, and allows for the use of lower-rated voltage components, enhancing compatibility and efficiency by incorporating both motor driving and voltage stabilization functions in a single device.
Implementation Method 1
a capacitor unit including a first capacitor and a second capacitor, wherein the first and second capacitors are coupled in series to each other, wherein the capacitor unit is coupled in parallel with the power supply stage such that the first and second capacitors are charged by a DC voltage supplied from the power supply stage
Implementation Method 2
an inverter unit including two pairs of driving switching elements and a pair of common switching elements, wherein the inverter unit is configured to convert the voltage charged in the capacitor unit into an AC power and to provide the AC power to a motor connected to the device
Data Source
AI summary
A device for stabilizing a direct current (DC) distribution system includes a capacitor unit charged by a DC voltage supplied by a power supply stage of the distribution system. The device further includes an inverter that has three pair of switching elements. The device also includes a controller that controls a plurality of switches thereof to selectively enable an inverter circuit or a voltage stabilizing circuit of the DC distribution system. The device alleviates instability of DC voltage which may be generated in a transient period, or to drive a motor connected to the device.