IGBT Bridge Circuit for Low-Frequency Vibration Control
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Solution Overview
Problem
Conventional electronic vibration generators used in powder transfer facilities often fail due to excessive electric current at ultra-low frequencies, leading to equipment fractures and clogging of discharge openings, which necessitates frequent maintenance and reduces operational efficiency.
Innovation Solution
An electronic vibrator utilizing a bridge circuit with an insulated-gate bipolar transistor (IGBT) and a circuit driving unit applying sine wave PWM modulation and triangular waves to generate vibrations, preventing excessive current flow and ensuring stable operation at low frequencies, while easily integrating into existing facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vibration generators operate at ultra-low frequencies, then they can effectively prevent powder clogging, but excessive electric current flows causing power device fractures
Solution Approach 1:
The patent implements periodic action by operating the vibration generator in ultra-low frequency ranges (e.g., 1-20 Hz) with controlled duty cycles. The power devices are switched on and off periodically, allowing the system to accumulate vibrational effect over time while limiting continuous conduction time. This periodic operation mode enables effective powder dispersion without subjecting power devices to excessive continuous current stress, thus preventing device fractures while maintaining clogging prevention.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting operating frequency and current parameters based on operational conditions. The control system modifies frequency within the ultra-low range and adjusts current limits to prevent excessive conduction. By changing these parameters adaptively, the system maintains effective vibration for powder prevention while keeping current within safe limits for power device durability.
2Use of energy by moving object
If conventional vibration generators use PWM inversion scheme, then driving efficiency increases, but electric current excessively increases at very low frequencies causing frequent breakdowns
Solution Approach 1:
The patent implements dynamics by making the PWM duty cycle variable rather than fixed. The control system dynamically adjusts the duty cycle based on the operating frequency, particularly at ultra-low frequencies where current tends to excessive. This dynamic adjustment allows the system to maintain high driving efficiency through PWM while adapting the conduction time to prevent excessive current at very low frequencies, thereby improving operation stability and reducing breakdowns.
Solution Approach 2:
The patent applies feedback mechanisms where the control system monitors operating conditions including frequency and current levels. When operating at ultra-low frequencies, the feedback loop detects potential excessive current conditions and automatically adjusts the PWM duty cycle or frequency to maintain safe current levels. This closed-loop control ensures driving efficiency is maintained while preventing the excessive current that causes breakdowns at very low frequencies.
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 prevents clogging of discharge openings, maintains powder liquidity, and ensures stable operation without increasing current, even at ultra-low frequencies, thereby enhancing the efficiency and reliability of powder transfer in facilities.
Implementation Method 1
a bridge circuit comprising an insulated-gate bipolar transistor (IGBT) as a power switching device for driving a large-capacity oscillator
Implementation Method 2
an electronic vibrator pulverizing and scattering powders transferred inside a chute, a hopper, or a transferring pipe facility
Data Source
AI summary
An electronic vibrator comprises a power source unit converting AC power into DC power, a bridge circuit comprising an insulated-gate bipolar transistor (IGBT) as a power switching device for driving a large-capacity oscillator, a circuit driving unit driving the bridge circuit and applying a sine wave which is a sine wave PWM modulation reference wave as well as a triangular wave, and a vibration generator connected to the bridge circuit, generating vibration by a current supplied by the bridge circuit.