Generator Boost Converter Switching Frequency Control
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Solution Overview
Problem
Existing generator systems with variable speed motors face inefficiencies due to high electrical losses at low speeds, particularly in commercial vehicles, where a stable output voltage is required across a wide speed range while minimizing installation space and maintaining energy efficiency.
Innovation Solution
A device comprising a generator, a pulse width modulated step-up converter, and a control system that adjusts switching times of power switches based on generator speed and voltage, using boost factors to optimize switching points and reduce losses, allowing for efficient energy delivery across varying speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a generator operates at variable speed to meet different power demands, then adaptability is improved, but electrical losses increase at low speeds
Solution Approach 1:
The control frequency of the power switches is dynamically adjusted based on the generator speed. At low speeds, the control frequency is reduced to minimize switching losses, while at higher speeds the frequency increases to maintain efficient power conversion. This parameter adaptation resolves the contradiction by optimizing the switching behavior according to the operating speed regime.
2Productivity
If the switching frequency of power switches is increased to improve voltage conversion efficiency, then power conversion efficiency is improved, but switching losses increase
Solution Approach 1:
The control frequency of the power switches is made dynamic rather than fixed. The control device adjusts the switching frequency in real-time based on the instantaneous generator speed and voltage conditions. This dynamic adaptation allows the system to achieve high conversion efficiency when needed while minimizing switching losses during low-speed operation.
3Stability of the object's composition
If a step-up converter is used to maintain stable output voltage across wide speed ranges, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The step-up converter control is integrated with the generator control system. The control device combines the functions of voltage regulation, frequency adaptation, and power optimization in a single control unit. This merging of functions achieves stable output voltage while avoiding the complexity of separate control systems.
4Loss of energy
If pulse width modulation is used to control power switches for efficient energy delivery, then energy efficiency is improved, but harmonic content in output increases
Solution Approach 1:
The control system uses periodic pulse width modulation with adaptive duty cycles based on generator speed and voltage conditions. By optimizing the switching pattern and frequency, the system achieves high energy efficiency while the adaptive control minimizes harmonic generation through optimized switching timing and frequency selection.
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 enables continuous, efficient electrical power generation with reduced switching losses and harmonics, providing a stable output voltage similar to a sine wave, even at low speeds, thus enhancing energy efficiency and reducing torque fluctuations.
Implementation Method 1
a step-up converter whose power switches are controlled
Data Source
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AI summary
The present invention relates to improving the performance of a generator that works in conjunction with a boost converter and a control unit. For this purpose, the control frequency of the boost converter switches is varied as a function of the generator's rotational speed, with the function operating with switching points and/or variable boost factors.