Redundant Capacitor Discharge Circuit for Switch Failure Control
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Solution Overview
Problem
Conventional capacitor discharge circuits fail to control discharge when the discharge-controlling switch element experiences open or short-circuit failures, leading to uncontrolled discharge and potential overheating of the discharge resistor.
Innovation Solution
A dualized discharge circuit configuration with two parallel circuits, each comprising a discharge resistor, a discharge-controlling switch element, and a breaking switch element, where the control unit switches between them to maintain control even if one set fails, using a switching relay to alternate between the first and second discharge circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single discharge-controlling switch element is used to control capacitor discharge, then the circuit structure is simple, but the reliability deteriorates because discharge control fails when the switch element experiences open or short-circuit failures
Solution Approach 1:
The discharge circuit is segmented into two independent discharge circuits, each with its own discharge resistor and discharge-controlling switch element. This segmentation allows the system to maintain discharge control capability even when one switch element fails, as the other can still function independently to control capacitor discharge.
Solution Approach 2:
Each discharge circuit is equipped with a breaking switch element that can locally isolate the failed discharge circuit from the capacitor. This local quality enhancement allows the system to maintain overall functionality by isolating the defective segment while preserving the operational discharge circuit.
2Reliability
If the discharge-controlling switch element is subjected to short-circuit failure, then the discharge continues uncontrollably, but adding protection mechanisms increases circuit complexity
Solution Approach 1:
A breaking switch element is added to each discharge circuit that can locally isolate the failed discharge circuit from the capacitor. This local isolation capability prevents uncontrolled discharge continuation by allowing the system to disconnect the defective discharge circuit while maintaining the other operational circuit.
Solution Approach 2:
The control unit monitors the status of discharge-controlling switch elements and automatically switches between the first and second discharge circuits based on detected failures. This feedback mechanism enables automatic adaptation to failures without requiring complex external protection circuits.
3Reliability
If a dualized discharge circuit configuration is implemented with two parallel circuits, then the reliability improves by maintaining control even if one set fails, but the device complexity increases
Solution Approach 1:
The discharge circuit is segmented into two independent discharge circuits, each with its own discharge resistor and discharge-controlling switch element. This segmentation allows the system to maintain discharge control capability even when one switch element fails, as the other can still function independently to control capacitor discharge.
Solution Approach 2:
Both the first and second discharge circuits are designed with identical functionality, allowing either circuit to serve as the active discharge path. The control unit can universally switch between them based on failure detection, making each circuit a potential backup for the other and enhancing overall system reliability.
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
Ensures controlled discharge of the capacitor even if the first discharge-controlling switch element fails, preventing overheating by dispersing heat across both discharge resistors in case of simultaneous failures, thus protecting the circuit components.
Implementation Method 1
electric charges accumulated in the capacitor are discharged through the discharge resistor
Data Source
Figure 1
Figure 2
AI summary
Provided is a discharge circuit for a capacitor, capable of performing discharge control even if a discharge-controlling switch element for controlling discharge of the capacitor is subjected to a failure. The discharge circuit is a discharge circuit for a capacitor provided between a charging circuit and a ground, the discharge circuit including: a control unit 1 for performing control of charge and discharge on the capacitor 3; a first discharge circuit having a first discharge resistor 5, a first discharge-controlling switch element 6, and a first breaking switch element 7 which are connected in series, the first discharge circuit being connected in parallel to the capacitor 3; and a second discharge circuit having a second discharge resistor 8, a second discharge-controlling switch element 9, and a second breaking switch element 10 which are connected in series, the second discharge circuit being connected in parallel to the capacitor 3, wherein the first discharge circuit is used in a normal state, and discharge of the capacitor 3 is controlled through opening and closing of the first discharge-controlling switch element 6 in a state where the first breaking switch element 7 is ON.