Power Driver Pulse Width Correction Through Delay Compensation
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Solution Overview
Problem
Pulse-width variations in power driver circuits can lead to significant issues, such as failure of the output stage to turn on due to slew rate limits, resulting in limited or missed intended effects, particularly in applications like LED lighting and audio equipment where pulsed waveforms are used.
Innovation Solution
The implementation of an apparatus comprising an operational amplifier, output stage, comparator, and timing circuit that measures and replicates delays in pulse signals to ensure the output pulse width matches the input, thereby improving dynamic range and preventing the output from never turning on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pulse width at an input varies significantly from the corresponding output pulse width, then the output stage may fail to turn on or miss intended effects, but adding timing measurement and delay replication circuits increases device complexity
Solution Approach 1:
The timing circuit measures the delay from input pulse leading edge to output stage turn-on in advance, then replicates this measured delay to the input pulse signal to pre-compensate for the delay, ensuring the output stage turns on reliably
Solution Approach 2:
A timing circuit is introduced as an intermediary component between the input pulse and output stage, measuring and replicating delays to mediate the pulse width variation problem
2Adaptability or versatility
If the output pulse width is made identical to the input pulse width, then dynamic range is improved, but requiring timing measurement and replication increases device complexity
Solution Approach 1:
The timing circuit performs preliminary measurement of pulse delays and replicates them to the input signal, enabling dynamic range improvement through proactive compensation rather than reactive correction
Solution Approach 2:
The timing circuit measures the actual delay in the system and uses this feedback information to adjust and replicate the appropriate delay to the input pulse, creating a closed-loop system that improves dynamic range
Data Source
AI summary
A system, method and apparatus is provided for pulse width correction in a power driver. In an embodiment, an apparatus includes an operational amplifier having an input and an output. The input of the operational amplifier is coupled to receive an input pulse signal. The apparatus further includes an output stage having an input coupled to the output of the operational amplifier. The output stage also includes a current output configured to couple to a load and to a voltage sense output. The apparatus also includes a comparator having an inverting input coupled to the voltage sense output of the output stage, a non-inverting input configured to couple to an input signal, and an output. Also, the apparatus includes a timing circuit with an input coupled to the output of the comparator and an input coupled to the input signal. The timing circuit also has an output to supply the input pulse signal. The timing circuit measures a delay from a change in the input signal to a change in the output of the comparator. The timing circuit replicates the measured delay as a delay in a change to the input pulse signal.