Driving Circuit Switch Timing to Block Conductive Paths
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Solution Overview
Problem
In switch control circuits, improper control of switches can lead to a conductive path between positive and negative voltage terminals during switching periods, causing negative charges to flow away and affecting the voltage levels, resulting in insufficient negative or positive voltages.
Innovation Solution
A driving circuit with a switch module that is turned off during a specific turn-off period, overlapping with the transition period of the input signal, to prevent the formation of a conductive path between the first and second reference terminals, thereby maintaining stable voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the switch module is turned off during the transition period to prevent conductive path formation, then the voltage stability is improved, but the switching speed is reduced due to the overlapping turn-off period
Solution Approach 1:
The switch module is turned off in advance during the transition period before the main switching action occurs. The turn-off period is designed to overlap with the transition period of the input signal, ensuring that the switch module is already non-conductive when the transistors begin to switch, thereby preventing conductive path formation while maintaining controlled switching speed
Solution Approach 2:
The circuit applies a preliminary anti-action by turning off the switch module during the transition period to counteract the potential harmful effect of conductive path formation. This preemptive measure ensures that even if transistors momentarily conduct during switching, no unwanted current flow occurs between voltage terminals
2Reliability
If the turn-off period of the switch module overlaps with the transition period of the input signal, then the conductive path is prevented, but the control signal complexity increases
Solution Approach 1:
The control signals for the switch module are merged with the input signal timing. The turn-off period is synchronized to overlap with the transition period of the input signal, allowing a single control mechanism to achieve both switching control and conductive path prevention without requiring entirely separate control circuitry
Solution Approach 2:
The control signal terminal serves multiple functions: it controls the normal switching operation of the transistors and simultaneously controls the switch module to prevent conductive paths. This multi-functional control approach reduces the need for additional dedicated control circuits
Data Source
AI summary
A driving circuit includes a first reference terminal, a second reference terminal, at least one input terminal, an output terminal, a first transistor, a second transistor, a switch module, and at least one control signal terminal. The at least one input terminal receives at least one input signal. The output terminal outputs an output signal in response to the at least one input signal. The first transistor and the second transistor respectively include control terminals coupled to the at least one input terminal. The switch module includes at least one control terminal coupled to the at least one control signal terminal to receive at least one control signal. The at least one input signal has a transition period. The switch module can be turned off according to the at least one control signal.