Antiparallel Thyristor Capacitor Discharge Circuit
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently discharging capacitive elements, particularly when an AC voltage is applied, as conventional methods often result in security and safety risks due to residual charges, and may incur energy losses or require additional components for discharge.
Innovation Solution
A method and circuit utilizing two thyristors in antiparallel configuration, with a control circuit to detect the absence of AC voltage and apply a gate current to a reverse-biased thyristor, facilitating efficient discharge of capacitive elements without additional switches or resistors, leveraging the same thyristors for both power conversion and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional discharge methods are used, then capacitive elements can be discharged, but security and safety risks arise due to residual charges
Solution Approach 1:
The patent extracts the discharge function from separate discharge circuits and integrates it into the existing antiparallel thyristor structure. By utilizing the inherent capability of reverse-biased thyristors to conduct leakage current, the solution removes the need for additional discharge components, thereby eliminating residual charges more effectively while maintaining safety.
Solution Approach 2:
The thyristors serve dual functions: power conversion during operation and discharge when stopped. The reverse-biased thyristor automatically conducts leakage current to discharge the capacitive element without requiring external discharge circuits, making the system self-sufficient for both operational and safety functions.
2Reliability
If additional switches or resistors are added for discharge, then discharge capability is improved, but device complexity increases
Solution Approach 1:
The antiparallel thyristor structure performs multiple functions: it enables AC-to-DC or DC-to-AC power conversion during operation and provides automatic discharge capability when the device stops. This multi-functionality eliminates the need for separate discharge circuits, reducing component count and simplifying the overall device architecture.
Solution Approach 2:
The patent merges the discharge function with the existing power conversion circuitry by utilizing the reverse-biased thyristor's natural leakage current path. This consolidation combines power conversion and discharge capabilities into a single integrated structure, avoiding the addition of separate switches, resistors, or discharge circuits.
3Reliability
If separate discharge circuits are used, then discharge function is added, but energy losses increase
Solution Approach 1:
The reverse-biased thyristor naturally conducts a small leakage current that automatically discharges the capacitive element without requiring external power or control. This self-service mechanism dissipates residual energy through the thyristor's inherent characteristics rather than through dedicated discharge resistors or circuits, minimizing additional energy losses.
Solution Approach 2:
The patent converts the typically harmful leakage current of reverse-biased thyristors into a beneficial discharge mechanism. Instead of viewing leakage current as waste or a problem to be eliminated, the solution harnesses it to automatically discharge capacitive elements, transforming a potential source of energy loss into a useful safety feature.
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 approach ensures safe and efficient discharge of capacitive elements, reducing energy losses and simplifying the circuit design by using the same thyristors for both power conversion and discharge, while maintaining high reliability and efficiency.
Implementation Method 1
applying a gate current to a reverse-biased thyristor among said two thyristors
Data Source
AI summary
A capacitive element has its terminals coupled together by two thyristors electrically in antiparallel. The discharge of the capacitive element is controlled by the application of a gate current to one thyristor of the two thyristors which is in a reverse-biased state in response to a voltage stored across the terminals of the capacitive element. The reverse-biased thyristor responds to the applied gate current by passing a leakage current to discharge the stored voltage.