Medium Frequency HV Power Supply for ESP
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high-voltage power supply systems for electrostatic precipitators face issues with power losses, size, cost, voltage ripple, and robustness/reliability, particularly in industrial applications where they need to handle large gas volumes and varying conditions.
Innovation Solution
A high-voltage power supply system utilizing medium frequency AC voltages (100 Hz-5000 Hz) with a combination of high-voltage switching and pulse forming circuits, reducing power losses and size while minimizing voltage ripple, and allowing for a more robust and cost-effective design by separating semiconductor controls from the pulse unit tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-voltage switching is used to generate pulses for electrostatic precipitators, then particle separation performance is improved, but power losses and system size increase
Solution Approach 1:
The patent changes the frequency parameter of the AC supply voltage to medium frequency (100-5000 Hz), which optimizes the balance between pulse generation effectiveness and power losses. This parameter change allows efficient energy transfer while reducing overall power consumption of the system
Solution Approach 2:
The patent employs periodic pulse superimposition on the DC base voltage, where pulses are applied at specific intervals to enhance particle separation. This periodic action improves separation performance while allowing the system to reset and reduce losses between pulse cycles
2Productivity
If high-voltage switching is used to generate pulses, then particle separation performance is improved, but device size and manufacturing cost increase
Solution Approach 1:
By operating at medium frequency (100-5000 Hz), the transformers and associated components can be designed with smaller dimensions while maintaining efficiency. This frequency optimization reduces the physical size of the power supply system compared to lower frequency designs
Solution Approach 2:
The patent divides the power supply into separate functional modules: a DC supply circuit for base voltage and a pulse supply circuit for pulse generation. This segmentation allows each module to be optimized independently, reducing overall system complexity and size
3Volume of stationary object
If conventional power supply systems are used, then system size is reduced, but voltage ripple increases
Solution Approach 1:
The patent separates the DC base voltage supply from the pulse generation function into distinct circuits. This segmentation allows the DC supply to be optimized for stability with minimal ripple, while the pulse circuit handles the dynamic pulse generation, maintaining overall system compactness
4Productivity
If high-voltage switching is implemented, then pulse generation capability is improved, but reliability and robustness decrease
Solution Approach 1:
The patent introduces a medium frequency AC supply as an intermediary between the low voltage control circuits and the high voltage pulse generation. This intermediary stage isolates the high voltage switching from the control electronics, improving reliability by preventing high voltage interference while maintaining robust pulse generation 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 system achieves reduced power losses, smaller size, lower manufacturing costs, and improved reliability by using medium frequency AC supplies and high-voltage switching, with reduced output ripple and the ability to mitigate the need for smoothing filters, enhancing overall performance and efficiency.
Implementation Method 1
a first transformer and a first rectifier circuit for transforming and converting the first AC supply voltage to the DC base voltage
Implementation Method 2
a second transformer and a second rectifier circuit for transforming and converting the second AC supply voltage to a DC pulse supply voltage
Implementation Method 3
an ESP uses electrostatic forces to separate dust particles from the gas stream
Implementation Method 4
avalanche multiplication and secondary emission which ionize the gas molecules, which in turn ionize these solid particles
Implementation Method 5
The negatively charged particles are subsequently attracted to the collecting electrodes to which they adhere
Data Source
AI summary
A high-voltage power supply system (1) for powering an electrostatic precipitator, ESP (10) is disclosed. The system has an AC supply circuit (2) configured to generate a first and a second AC supply voltage, and two supply circuits (5, 6) connected between the AC supply circuit and the ESP. One of the supply circuits is a DC supply circuit (5) configured to transform and convert the first AC supply voltage to a DC base voltage for the ESP, while the other is a pulse supply circuit having a pulse forming circuit (12) configured to generate and forward high-voltage pulses to the ESP. The AC supply circuit is configured such that each of the AC supply voltages are in the mid frequency range, i.e. in the range of 100 Hz to 5000 Hz. Hereby, a cost effective, low weight and compact high-voltage power supply system is presented.