LED Drive Protection Circuit for Ring Wave Interference
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Solution Overview
Problem
DC-powered electronics, such as LED lighting devices, are prone to damage due to ring wave interference, which can cause abnormal operation or breakdown of semiconductor devices in the drive circuit, leading to safety risks and equipment failure.
Innovation Solution
A protection circuit is introduced that includes a detection unit to monitor the power supply bus voltage and a control unit to maintain a forcible non-conductive state of the switch circuit when a preset voltage warning condition is met, preventing damage from ring wave interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch circuit is continuously monitored and forcibly disconnected during voltage fluctuations, then the reliability of electronics is improved, but the device complexity increases due to the addition of detection and control units
Solution Approach 1:
The detection unit continuously monitors the power supply bus voltage in advance to detect ring wave interference before it causes damage. The control unit is pre-configured to forcibly disconnect the switch circuit when voltage fluctuations exceed preset thresholds, preventing damage before it occurs.
Solution Approach 2:
The protection circuit acts as an intermediary between the power supply bus and the switch circuit. The detection unit monitors voltage through the acquisition module, the detection module analyzes the voltage signals, and the control unit mediates by controlling the switch device to disconnect the load when necessary, protecting the electronics from ring wave interference.
2Object-affected harmful factors
If the switch circuit is forcibly disconnected during ring wave interference, then the harmful effects are reduced, but the productivity decreases due to interruption of normal operation
Solution Approach 1:
The protection circuit applies preliminary anti-action by detecting voltage fluctuations that indicate ring wave interference and forcibly disconnecting the switch circuit before the interference can cause harmful effects. This prevents damage to electronics while minimizing interruption time.
Solution Approach 2:
The detection unit continuously monitors the power supply bus voltage and provides feedback to the control unit. When the detected voltage exceeds preset thresholds, the control unit activates the protection mechanism to disconnect the switch circuit, and can restore it when voltage returns to normal, creating a dynamic feedback-based protection system.
3Reliability
If voltage detection and control mechanisms are added, then the protection against ring wave is enhanced, but the loss of time increases due to detection and response delays
Solution Approach 1:
The detection unit continuously monitors voltage in advance, and the control unit is pre-configured with preset voltage thresholds and protection periods. When voltage fluctuations are detected, the control unit immediately activates the protection mechanism without delay, minimizing response time while maintaining reliable protection.
Data Source
AI summary
A linear driving system for LED with high power factor including a rectifying circuit receiving an AC voltage and generating a DC voltage to a power supply bus having a protection circuit coupled thereto. The protection circuit includes a detection unit for acquiring a voltage signal based on a power supply bus voltage, and to generate a detection result which indicates undesirable oscillation on the power supply bus voltage. A control unit includes a delay control module connected with the detection unit, and is coupled to the detection unit and for generating a control signal based on the detection result. The delay control module is for outputting a first control signal when undesirable oscillation happens, and outputting a second control signal after a protection period when undesirable oscillation disappears. A switch circuit controlled by the first control signal and the second control signal turns off for the protection period.