Triac-Diode Gate Circuit for Multi-Thyristor Cathode Control
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Solution Overview
Problem
Existing thyristor control devices, particularly those for cathode-gate thyristors, face inefficiencies in power consumption and switching mechanisms, as they often require complex power supply configurations and cannot simultaneously control multiple thyristors efficiently.
Innovation Solution
A control device comprising a triac and diodes, configured to deliver control signals to cathode-gate thyristors, allowing for efficient switching in the first quadrant with reduced leakage current and the ability to control multiple thyristors using a single control signal, eliminating the need for isolated power sources and optocouplers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If known thyristor control devices are used, then the thyristor can be controlled to switch to the on state, but the power consumption is high and the device requires complex power supply configurations
Solution Approach 1:
The control device is designed to control multiple cathode-gate thyristors using a single control signal and a single power supply. The triac and diodes are configured to distribute the control signal to multiple thyristors simultaneously, eliminating the need for separate control circuits and isolated power sources for each thyristor, thereby reducing both power consumption and device complexity
Solution Approach 2:
Multiple control functions are merged into a single control device. The patent combines the control of multiple thyristors into one unified circuit using a triac and diodes, where a single control signal applied to the triac gate can trigger multiple thyristors through the diode network, consolidating what would traditionally require multiple separate control devices
2Productivity
If known control devices are used, then individual thyristor control is achieved, but the ability to control multiple thyristors efficiently is lost
Solution Approach 1:
The control device is designed with universal functionality to control any number of cathode-gate thyristors through a single control signal. The circuit topology using triac and diodes allows the same control device to be applied whether controlling one thyristor or multiple thyristors in parallel, enhancing both productivity and adaptability
Solution Approach 2:
The control signal distribution is segmented through diodes that independently route the control signal to multiple thyristors. Each diode acts as an independent path, allowing the control signal to be segmented and delivered to multiple thyristors simultaneously without interference, enabling efficient multi-thyristor control
3Reliability
If complex power supply configurations are used, then reliable thyristor control is achieved, but the control circuitry becomes complicated
Solution Approach 1:
The control device uses the existing power supply that is already connected to the thyristor circuit to generate the control signal. The triac and diodes are configured to automatically generate the appropriate control signal from the circuit's own power supply, eliminating the need for separate isolated power sources and complex power supply configurations, thereby maintaining reliability while reducing complexity
Solution Approach 2:
The power supply function is merged with the control signal generation function. Instead of using separate isolated power supplies for control, the invention combines the power supply used for the thyristor circuit with the control signal generation, using the same power source for both purposes through the triac-diode configuration
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 efficient switching of thyristors in the first quadrant with reduced leakage current and the ability to control multiple thyristors using a single control signal, improving power efficiency and simplifying the control circuitry, while allowing for integration into solid-state relays and rectifying bridges.
Implementation Method 1
a first diode series-connected between the triac and a first terminal of the control device that is configured to be connected to a cathode gate of a thyristor
Data Source
AI summary
A control device includes a triac and a first diode that is series-connected between the triac and a first terminal of the device that is configured to be connected to a cathode gate of a thyristor. A second terminal of the control device is configured to be connected to an anode of the thyristor. The triac has a gate connected to a third terminal of the device that is configured to receive a control signal. The thyristor is a component part of one or more of a rectifying bridge circuit, an in-rush current limiting circuit or a solid-state relay circuit.