PWM Controller Dynamic Phase Selection for Circuit Reliability
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Solution Overview
Problem
Conventional PWM control devices have a higher failure rate for certain driving circuits due to uneven utilization and lack of dynamic phase selection, leading to reduced service life and inefficient load management.
Innovation Solution
A PWM control device with a controller that arbitrarily enables or disables driving circuits based on load capacity, randomly selecting replacement circuits for damaged ones to equalize utilization and adjust phase output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If predetermined driving circuits are always selected to output current regardless of load capacity, then the control logic is simple, but the failure rate of those driving circuits increases due to uneven utilization
Solution Approach 1:
The patent implements dynamic phase selection where the controller randomly selects which driving circuits to enable based on current load conditions. Instead of a fixed predetermined sequence, the system adapts its configuration in real-time, randomly choosing from available phases to distribute utilization evenly across all driving circuits, thereby reducing failure rates through balanced workload distribution.
2Ease of operation
If the PWM device changes output phase number gradually according to fixed sequence, then the control method is simple, but the utilization rate of driving circuits becomes uneven
Solution Approach 1:
The patent inverts the conventional approach by using random selection instead of fixed sequential selection. Rather than following a predetermined order (phase 1-2, then 1-2-3, then 1-2-3-4), the system randomly determines which phases to activate, ensuring that no single driving circuit is consistently over-utilized. This inversion of the selection logic achieves equalized utilization while maintaining simple control through random number generation.
3Speed
If predetermined driving circuits are always enabled, then the response time is fast, but the service life of those driving circuits is reduced due to continuous operation
Solution Approach 1:
The patent implements periodic random reconfiguration of driving circuit selection. The controller periodically changes which driving circuits are enabled based on random selection, creating a rotating utilization pattern. This periodic reshuffling ensures that no single driving circuit operates continuously, distributing the operational burden over time and extending the overall service life of the driving circuit system while maintaining rapid response capability.
Data Source
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AI summary
In a pulse width modulation (PWM) control device and driving method, the PWM control device includes a PWM device, for providing a plurality of PWM signals; and a controller electrically connected to the PWM device and a plurality of driving circuits, for controlling PWM signals to arbitrarily enable or disable the plurality of driving circuits according to load capacity; wherein when driving circuits are damaged, the controller disables the damaged driving circuits and replaces the damaged driving circuits with the other driving circuits.