Variable Voltage Power Supply for Electric Drive Control
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Solution Overview
Problem
Existing electric drive device systems, particularly AC induction motors, face challenges in efficiently controlling voltage and frequency to optimize performance across various applications without active power sources, requiring innovative control modes to ensure fault-free operation and efficient energy management.
Innovation Solution
The system operates in either voltage control mode or frequency control mode, adjusting input voltage and frequency commands to generate a variable output voltage using pulse width modulation, with the ability to maintain a commanded frequency and voltage relationship, providing protection and efficient energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power supply unit is used to control both voltage and frequency, then device complexity is reduced, but control precision and adaptability to different operating modes deteriorate
Solution Approach 1:
The power supply unit is designed to perform multiple functions by switching between voltage control mode and frequency control mode. The same hardware infrastructure supports both control modes, allowing a single unit to replace what would traditionally require separate dedicated power supply units for each control mode.
2Measurement precision
If active power sources are attached to AC terminals for improved control, then control precision improves, but device complexity and energy loss increase
Solution Approach 1:
The system utilizes the existing AC power source already present in the environment rather than requiring additional active power sources to be attached to AC terminals. The power supply unit processes and controls this existing power source to provide precise voltage and frequency control without the need for extra energy-consuming components.
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
This approach allows for flexible and efficient control of electric drive devices, ensuring reliable operation and energy management by maintaining a commanded frequency and voltage relationship, enhancing performance and protection in electric drive systems.
Implementation Method 1
generating a pulse width modulation reference based on the adjusted at least one of the input frequency command and the input voltage command and generating the output variable voltage based on the pulse width modulation reference
Data Source
AI summary
At least one example embodiment discloses a method of generating an output variable voltage. The method includes obtaining a selected mode of operation, the selected mode of operation being one of an voltage control mode and a frequency mode, determining an input voltage command based on the selected mode of operation, determining an input frequency command based on the selected mode of operation, adjusting at least one of the input frequency command and the input voltage command based on the selected mode of operation, generating a pulse width modulation reference based on the adjusted at least one of the input frequency command and the input voltage command and generating the output variable voltage based on the pulse width modulation reference.