Delay-Time Correction Circuit for Semiconductor Drive Signal Width Accuracy
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Solution Overview
Problem
Existing semiconductor devices face challenges in accurately correcting deviations in the width of output signals due to variations in transition change periods of semiconductor switching elements, leading to waveform distortion in inverters, which is difficult to address with simple configurations.
Innovation Solution
A delay-time correction circuit that includes a transition-change sensor, a correction-signal generator, and a delay output unit, which senses transition changes and generates correction signals to adjust the delay time of input signals, allowing for precise correction of deviations in output signal widths without complex analysis or adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex control mechanisms are used to correct output signal width deviations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The delay-time correction circuit uses feedback by detecting the actual turn-on and turn-off timing of the semiconductor switching element and comparing it with the ideal timing. The detected timing information is fed back to adjust the delay time of drive signals, creating a closed-loop system that automatically corrects output signal width deviations without requiring complex external control mechanisms.
Solution Approach 2:
The correction circuit serves itself by using its own output signals to detect the actual switching timing and automatically adjusting its internal delay parameters. The circuit monitors its own performance and self-corrects the timing deviations, eliminating the need for complex external control systems.
2Device complexity
If simple configurations are used, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The invention replaces complex mechanical or external control adjustment mechanisms with an integrated electronic correction circuit that uses signal processing and timing detection. The correction is achieved through electronic delay adjustment based on detected timing information, substituting simple electronic components for complex control systems while maintaining waveform quality.
3Measurement precision
If delay time correction is implemented, then output signal width accuracy is improved, but device complexity increases
Solution Approach 1:
The delay-time correction circuit merges the correction functionality directly into the existing drive circuit architecture. The correction circuit is integrated with the drive unit and semiconductor switching element, combining multiple functions (drive signal generation, timing detection, and delay correction) into a unified structure that minimizes overall device complexity while achieving accurate output signal width control.
Data Source
AI summary
A delay-time correction circuit delays an input signal for generating a pre-drive signal to a drive unit generating a drive signal. A transition-change sensor senses a transition change in one of a turn-on operation and turn-off operation. A correction-signal generator generates a correction signal in response to the transition change sensed by the transition-change sensor and to the input signal. A delay output unit generates an output signal corresponding to the pre-drive signal by delaying the input signal using the correction signal. The delay output unit delays the output signal that instructs the other of a turn-on operation and turn-off operation, from the input signal, in accordance with a length of a period for the transition change in the one of a turn-on operation and turn-off operation that is performed immediately before the other of a turn-on operation and turn-off operation.