Servo DC Bus Filter Circuit for Voltage Oscillation Suppression
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Solution Overview
Problem
In systems with multiple electric motors and servo drivers, voltage oscillations occur due to impedance mismatch between the DC bus and motor control devices, leading to increased radiation noise and the need for numerous cables.
Innovation Solution
A DC power supply device with a filter circuit that detects voltage or current fluctuations and adjusts its impedance to prevent oscillations by using a series connection of a capacitor and a variable resistance, controlled by a controller to stabilize the DC output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a DC power supply device is used to supply power to multiple motor control devices through a DC bus, then the number of cables is reduced and system complexity is decreased, but voltage oscillation occurs due to impedance mismatch between the power supply side and motor side
Solution Approach 1:
The patent applies dynamics by making the resistance value adjustable rather than fixed. The resistance element can dynamically change its value based on operating conditions to optimize the impedance match between the power supply side and motor side, preventing voltage oscillation while maintaining system simplicity
Solution Approach 2:
The patent changes the impedance parameter of the power supply circuit by using a variable resistance element. By adjusting the resistance value, the impedance match between the power supply side and motor side is optimized, which prevents voltage oscillation and improves voltage stability without increasing system complexity
2Speed
If the impedance on the motor side is made smaller to improve motor control performance, then motor responsiveness is improved, but voltage oscillation is triggered due to impedance mismatch with the power supply side
Solution Approach 1:
The patent changes the impedance parameter of the power supply circuit by using a variable resistance element. By adjusting the resistance value, the impedance match between the power supply side and motor side is optimized, which prevents voltage oscillation and improves voltage stability without increasing system 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
Prevents voltage oscillations in the power supply path to motor control devices, reducing noise and cable requirements while maintaining stable power delivery.
Implementation Method 1
adjust impedance of own circuit such that the voltage fluctuation or the current fluctuation of the DC is prevented
Implementation Method 2
a series connection body of a capacitor and a variable resistance, the series connection body being disposed between a positive-side power line and a negative-side power line
Data Source
AI summary
A DC power supply device capable of preventing voltage oscillation of a power supply path to a motor control device is provided. The DC power supply device includes a power supply unit (such as an AC/DC converter) that outputs a DC and a filter circuit that detects a voltage fluctuation of the DC output from the power supply unit and adjusts impedance of own circuit such that the voltage fluctuation of the DC is prevented based on a detection result.