Switch Gate Blocking Delay to Prevent Parasitic Turn-On
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Solution Overview
Problem
Existing switching converters, particularly inverters, face inefficiencies and reliability issues due to untimely switching and parasitic effects that can lead to short circuits and reduced performance.
Innovation Solution
A method and device for controlling switches in converters that involve applying a blocking potential to the control terminal after a delay, ensuring the switch remains blocked during inactive periods and quickly transitions to the on state, using a circuit with a capacitive and resistive element to manage the blocking potential and prevent parasitic switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking potential is applied immediately after switching, then the switch is reliably blocked during inactive periods, but parasitic switching and short circuits occur due to timing conflicts with switching cycles
Solution Approach 1:
The blocking potential is applied after a deliberate delay period following the switching event, allowing the switch to complete its opening transition before blocking is engaged. This preliminary timing action prevents conflict with parasitic voltage spikes and ensures reliable blocking without causing short circuits.
Solution Approach 2:
The blocking potential counteracts parasitic switching effects by being applied at a precisely timed moment that prevents parasitic turn-on. The delay mechanism ensures the blocking potential is ready to counteract any parasitic effects that may arise during the switching transition.
2Productivity
If the switch transitions quickly to the on state, then switching efficiency is improved, but the risk of untimely switching and short circuits increases
Solution Approach 1:
The blocking potential is prepared and applied after a delay that allows the switch to complete its state transition. This preliminary timing ensures the switch has safely reached its target state before blocking is engaged, preventing untimely switching while maintaining efficient operation.
3Speed
If the first delay is made very short, then switching speed is improved, but the blocking potential may interfere with ongoing switching operations
Solution Approach 1:
The delay period is designed to be sufficiently long to allow switching operations to complete, but not excessively long to maintain switching speed. This preliminary timing action ensures stability by preventing interference with ongoing switching while maintaining efficient operation.
Solution Approach 2:
The blocking potential is applied periodically in synchronization with the switching cycle, with the delay period aligned to the switching frequency. This periodic application ensures the blocking potential is engaged at the correct phase of the switching cycle, maintaining both speed and stability.
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 enhances the reliability and efficiency of switching converters by preventing untimely switching and reducing the risk of short circuits, thereby improving the overall performance and longevity of the converter.
Implementation Method 1
a capacitive element connecting said supply node to another control terminal of said another switch
Implementation Method 2
a resistive element and a diode, electrically in parallel between said other control terminal and a node for receiving a signal representative of said command
Data Source
Figure 1
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AI summary
This description relates to a method for controlling a switch (T), comprising: a) applying a command (S) to a control terminal (316) of the switch, said command having at least one first switching between a switch-closed control state and a switch-open control state, the switch transitioning to a blocked state in one opening time from the first switching; and b) applying a switch-blocking potential to said control terminal after a first delay starting at said first switching, the first delay being greater than the opening time.