Zigzag Transformer Igniting Odd Silicon Rod Counts
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Solution Overview
Problem
Existing circuit arrangements for igniting thin silicon rods are only suitable for numbers that are multiples of four or even, making them insufficient for igniting odd numbers of rods.
Innovation Solution
The secondary winding systems of a three-phase transformer are wound in a zigzag configuration, with auxiliary three-phase transformers connected to form a closed delta system, allowing the thin rods to be connected in series and ignited with a three-phase AC power source, enabling ignition of rods in any number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-phase transformer with star-connected winding systems is used, then the circuit arrangement can ignite an even number of thin silicon rods (multiples of four), but it cannot ignite an odd number of rods
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetric star-connected winding system to an asymmetric zigzag-connected winding system. The zigzag connection creates unequal phase relationships that allow for flexible configuration of any number of rods (including odd numbers) by selectively connecting rods to different taps on the winding strands, thereby resolving the limitation of only accommodating multiples of four rods.
Solution Approach 2:
The patent implements dynamics by introducing controllable switches that can selectively connect to different taps on the winding strands. This dynamic switching capability allows the circuit arrangement to adapt its configuration based on the number of rods to be ignited, enabling versatile operation from 3 to 12 rods by dynamically reconfiguring the circuit topology.
2Reliability
If high voltage (greater than 2500 V) is applied to ignite thin silicon rods, then the rods can be successfully ignited, but expensive insulation is required in the reactor
Solution Approach 1:
The patent applies parameter changes by utilizing the zigzag connection to create variable voltage distributions across different phases. By selectively tapping different points on the winding strands and using controllable switches, the system can optimize voltage allocation to achieve reliable ignition while reducing peak voltage stress on insulation, thereby maintaining ignition reliability with reduced insulation requirements.
Solution Approach 2:
The patent introduces controllable switches as intermediary components between the transformer windings and the thin silicon rods. These switches act as mediators that can selectively connect or disconnect phases, allowing for flexible voltage application that achieves reliable ignition while providing control over voltage distribution to reduce insulation demands on the reactor.
3Device complexity
If the secondary winding systems are connected in a star system, then the circuit arrangement is simple, but it cannot accommodate odd numbers of thin silicon rods
Solution Approach 1:
The patent transforms the symmetric star connection into an asymmetric zigzag connection, which inherently provides greater flexibility in accommodating different numbers of loads. The zigzag topology creates multiple accessible taps with different voltage relationships, enabling the system to adapt to any number of rods from 3 to 12 by selective switching, thus resolving the adaptability limitation of the star system.
Solution Approach 2:
The patent segments the secondary winding systems into multiple strands with multiple taps along each strand. This segmentation creates discrete voltage levels and phase relationships that can be selectively combined through controllable switches, allowing the system to accommodate any number of rods by selecting appropriate combinations of segmented winding portions.
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 configuration allows for the ignition of thin silicon rods in any number, including odd quantities, by providing a flexible and efficient voltage supply that cancels out voltages, reducing the need for expensive insulation and ensuring uniform heating.
Implementation Method 1
a three-phase transformer (2) having a primary side (10) and a secondary side (11)
Implementation Method 2
the secondary winding systems (14) in the three winding strands (50, 51, 52) are wound in a zigzag system
Implementation Method 3
The thin silicon rods in the reactor are heated electrically, with the thin silicon rods being supplied or fed with voltage
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The arrangement (1) has a three-phase transformer (2) provided with a primary side and a secondary side (11). Secondary-side windings of the three-phase transformer comprise a secondary winding system (15), and are interconnected with one another such that sum of AC voltage of the secondary-side windings comprises secondary voltage vectors (43-45) and cancels one another out in a three-phase closed vector triangle system (46), where the three-phase transformer has delta winding/connection on the primary side and star winding/connection on the primary side.