PWM Delay Control Circuit for Threshold-Based Output Stop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing delay time control circuits fail to stop PWM signal output at a point where the output voltage is a voltage threshold or lower, often resulting in inefficiencies and increased circuit complexity due to component variations.
Innovation Solution
A delay time control circuit is introduced between the cycle stop circuit and the signal output circuit, outputting a delay signal to stop the PWM signal after a predetermined delay time, allowing precise control over the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the PWM signal output is stopped at the end of the cycle, then the control is simple, but the output voltage may exceed the voltage threshold due to component variations
Solution Approach 1:
The delay time control circuit generates a delay signal in advance based on the stop signal, causing the PWM signal to stop after a predetermined delay time rather than immediately. This preliminary timing adjustment ensures the output voltage reaches the threshold before stopping, resolving the voltage exceedance issue without adding complex control logic.
2Manufacturing precision
If the PWM signal output is stopped immediately when a stop signal is input, then the response time is short, but the output voltage cannot be controlled to be at or below the voltage threshold
Solution Approach 1:
The system performs preliminary timing calculation to determine the optimal stop point. By generating a delay signal that accounts for the predetermined delay time, the PWM signal stops at the precise moment when the output voltage reaches the threshold, achieving both precision and acceptable timing.
Solution Approach 2:
The delay time control circuit receives the stop signal and generates a delayed stop command based on predetermined delay time. This feedback mechanism ensures the PWM signal continues for the exact duration needed to reach the voltage threshold before stopping, achieving precise voltage control.
3Manufacturing precision
If component variations are not compensated for, then the circuit is simple, but the output voltage exceeds the voltage threshold
Solution Approach 1:
The delay time control circuit performs preliminary timing adjustment to compensate for component variations. By extending the PWM signal duration with a predetermined delay time, the system ensures the output voltage reaches the threshold regardless of component variations, achieving precision without complex compensation circuits.
Data Source
AI summary
A delay time control circuit, wherein the delay time control circuit outputs a delay signal to a signal output circuit for outputting a PWM signal to an output circuit, the delay signal being an instruction to stop output of the PWM signal after elapse of a predetermined delay time from an end of a cycle of the PWM signal being output by the signal output circuit.