Phase Shift Circuit for Even LED Pulse Distribution
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Solution Overview
Problem
Existing LED control systems face challenges in efficiently adapting to variations in the number of active LED channels and responding to channel failures, leading to uneven distribution of pulse phases and increased acoustic, electrical, and RF noise.
Innovation Solution
A phase shift generation circuit that uses edge detectors, divide by N circuits, pulse counters, recycling timers, and flip-flops to generate uniformly spaced output pulses, adapting to changes in the number of active channels and redistributing phases to minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed phase shift generation circuit is used, then the circuit structure is simple, but it cannot adapt to variations in the number of active LED channels
Solution Approach 1:
The phase shift generation circuit uses a dynamic configuration where the number of active phases is determined by a digital input parameter rather than being fixed. The circuit can adaptively change the number of active LED channels by modifying the phase distribution according to the detected number of operational channels, making the system flexible and reconfigurable.
Solution Approach 2:
The circuit changes its operational parameters based on the number of active LED channels. By detecting which channels are operational and adjusting the phase shift distribution accordingly, the system optimizes performance by redistributing phases evenly across available channels, thereby adapting to varying system conditions without requiring a complete redesign.
2Reliability
If channels are shut off due to failure, then system reliability is maintained, but pulse phase distribution becomes uneven
Solution Approach 1:
The system incorporates feedback mechanisms that detect the operational status of LED channels and use this information to dynamically adjust the phase shift distribution. When channels fail, the feedback loop identifies the failure and redistributes the phases to maintain even spacing across the remaining active channels, thereby preserving both reliability and uniformity.
3Ease of operation
If LED current pulses are generated with fixed phases, then the control is simple, but acoustic, electrical, and RF noise is increased
Solution Approach 1:
The circuit dynamically adjusts the phase distribution of LED current pulses based on the number of active channels. By changing the phase shifts adaptively, the system minimizes noise generation in sensitive frequency ranges while maintaining ease of control through a unified control interface that automatically optimizes the phase configuration.
Data Source
AI summary
A phase shift generation circuit has an edge detector, which outputs a first and a second edge signal. The circuit also has a divide by N circuit, which receives a first clock signal and a group of signals representing a number N, and outputs a second clock signal. The circuit further comprises a pulse counter, which receives the first edge signal and the second clock signal, and outputs a group of signals representing the number of the second clock pulses between occurrences of the first edge signal. The circuit has first and second recycling timers, which output a group of pulses approximating a uniformly spaced group across the time duration of the period of the input pulse. The circuit also comprises at least one flip flop which generates a phase shifted output pulse.