Thyristor-Gated Voltage Converter for Reverse Current Control
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Solution Overview
Problem
Existing voltage converters face inefficiencies and limitations in controlling AC/DC conversions, particularly in managing transistor and thyristor states to optimize current injection and voltage regulation.
Innovation Solution
A voltage converter configuration using series-coupled transistors and thyristors with specific operational periods and current injection strategies, allowing for efficient AC/DC conversion by controlling transistor and thyristor states to manage current flow and voltage across nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional voltage converters use standard transistor and thyristor control methods, then the circuit structure is simple, but the conversion efficiency is low and current peak problems occur
Solution Approach 1:
The patent implements dynamic control of transistor and thyristor states through multiple operational periods (first period with both on, second period with both off, third period with transistor off and thyristor on). This dynamic switching strategy optimizes current flow patterns, reduces current peaks, and improves conversion efficiency without requiring complex additional power supply circuits
Solution Approach 2:
The control method employs periodic switching between different operational states of the transistor and thyristor combination. By cycling through specific on/off sequences in defined periods, the system achieves efficient AC/DC conversion while managing current injection and voltage regulation in a rhythmic, predictable manner that avoids harmful current peaks
2Object-affected harmful factors
If standard thyristor gate control is used, then the circuit is simple, but current peaks and electromagnetic noise occur
Solution Approach 1:
The patent applies preliminary action by injecting current into the thyristor gate during specific periods (third period when transistor is off) before the main conduction phase. This pre-charging of the gate ensures controlled turn-on behavior, preventing sudden current peaks and reducing electromagnetic noise when the thyristor activates during the first period
Solution Approach 2:
The control method maintains continuous useful action by ensuring smooth transitions between operational periods. The thyristor gate current injection is continuously managed across different periods, maintaining optimal conduction states and avoiding abrupt changes that would generate electromagnetic noise, while keeping the circuit structure relatively simple
3Device complexity
If bidirectional conversion is enabled without additional power supply circuits, then device complexity is reduced, but control precision is challenged
Solution Approach 1:
The patent achieves bidirectional conversion capability using the same transistor-thyristor combination without additional power supply circuits. The same components perform multiple functions: AC to DC conversion during first period operation, and DC to AC conversion during second period operation. This universal approach reduces device complexity while maintaining adequate voltage regulation through periodic control
Solution Approach 2:
The control method achieves precise voltage regulation by dynamically changing operational parameters across different periods. By adjusting the timing and duration of transistor and thyristor conduction states, and controlling gate current injection parameters, the system achieves bidirectional conversion with sufficient voltage regulation precision without requiring complex additional circuits
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 enhances the efficiency of AC/DC conversion by optimizing current injection and voltage regulation, reducing the risk of current peaks and electromagnetic noise, and enabling bidirectional conversion without additional power supply circuits.
Implementation Method 1
a current is injected into the gate of the first thyristor... injecting current into the gate of the second thyristor
Data Source
AI summary
A converter includes first and second transistors coupled between first and second nodes, and first and second thyristors coupled between the first and second nodes. The converter is controlled for operation to: in first periods, turn the first transistor and second thyristor on and turn the second transistor and the first thyristor off, and in second periods, turn the first transistor and the second thyristor off and turn the second transistor and the first thyristor on. Further control of converter operation includes, for a third period following each first period, turning the first and second transistors off, turning the second thyristor off, and injecting a current into the gate of the first thyristor. Additional control of converter operation includes, for a fourth period following each second period, turning the first and second transistors off, turning the first thyristor off, and injecting a current into the gate of the second thyristor.