Voltage Converter Control Device for Motor Drive Efficiency
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Solution Overview
Problem
Existing voltage converter technologies face inefficiencies during voltage step-up or step-down operations, particularly when the target input voltage of the inverter is lower than the power supply voltage, limiting their ability to improve converter efficiency in these conditions.
Innovation Solution
A control device for a voltage converter that includes a first and second switching element, rectifying elements, and a reactor, with a control system that calculates current command values and selects the appropriate switching elements for feedback control, adjusting operation modes based on current command values and detected voltages to optimize voltage conversion while reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the converter performs voltage step-up or step-down operations, then the inverter can receive appropriate input voltage, but the converter efficiency deteriorates due to increased switching losses
Solution Approach 1:
The patent applies dynamics by making the converter operation mode adjustable based on real-time conditions. The control device dynamically selects between single-arm drive mode and dual-arm drive mode according to the absolute value of the current command value, enabling the system to adapt its switching behavior to minimize losses while maintaining required voltage conversion capability.
Solution Approach 2:
The patent changes the operational parameters of the converter by switching between different drive modes. When the absolute value of the current command value exceeds a threshold, the system transitions to single-arm drive mode with modified switching patterns, thereby changing the electrical parameters and reducing switching losses during voltage conversion operations.
2Loss of energy
If the converter operates in conventional mode, then voltage conversion is achieved, but the efficiency cannot be improved when voltage step-up or step-down is required
Solution Approach 1:
The control device dynamically adjusts the converter's operation mode based on real-time current command values. When voltage conversion is needed (|Icmd| > threshold), the system automatically switches to single-arm drive mode, which is optimized for voltage step-up or step-down operations, thereby maintaining adaptability while improving efficiency.
Solution Approach 2:
The patent segments the converter operation into two distinct modes: dual-arm drive mode for normal operation and single-arm drive mode for voltage conversion operations. This segmentation allows each mode to be optimized independently, with the single-arm mode specifically designed to reduce losses during voltage step-up or step-down while maintaining the required conversion capability.
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 enhances the efficiency of the voltage converter during voltage step-up or step-down operations by minimizing switching losses and optimizing current flow, thereby improving the overall efficiency of the motor drive control system.
Implementation Method 1
a first switching element and a second switching element connected in series between an electric power line for the load device and a ground line
Implementation Method 2
a first rectifying element and a second rectifying element connected in parallel with the first switching element and the second switching element respectively
Implementation Method 3
a reactor provided on a path connecting a connection node of the first switching element and the second switching element and a positive terminal of the power storage device
Data Source
AI summary
In a converter of a motor drive control device, one of a first switching element and a second switching element is selected in accordance with a current command value of a current flowing through a reactor. The converter is then controlled so that a drive command for the selected switching element is generated. In this way, the efficiency of the converter is improved while a voltage step-up or step-down operation is performed by the converter.