LED Quick Activation Circuit for Large Filter Capacitors
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Solution Overview
Problem
Conventional LED units take a long time to activate due to large capacitance in their driving circuits, leading to misinterpretation of malfunction and inefficient illumination under low luminance conditions.
Innovation Solution
An LED quick activation system with a driving circuit, loading module, filter capacitor, current control switch, and primary controller that calculates and controls charging and discharging periods to rapidly charge the filter capacitor without feedback voltage detection, using a combination of controllers, logic gates, and discharging modules to achieve rapid activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large capacitance capacitor is mounted at the driving circuit's output stage to improve illuminating stability, then the LED's illuminating stability is improved, but the activation period becomes too long under low luminance conditions
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor to a voltage higher than the normal operating voltage before the LED is activated. This is achieved through a quick start circuit that applies a higher voltage during the initial startup phase, allowing the capacitor to be charged more rapidly and reducing the activation period while still providing stable illumination once activated.
2Measurement precision
If feedback voltage detection is used to control the charging process, then the charging accuracy is improved, but the circuit complexity and standby power consumption increase
Solution Approach 1:
The patent uses a simple voltage threshold detection method instead of complex feedback voltage detection. The system employs a simple comparator or voltage threshold circuit that detects when the capacitor voltage reaches a predetermined threshold, at which point the quick start circuit is disabled. This approach achieves sufficient charging accuracy without requiring complex feedback mechanisms, thereby reducing circuit complexity and standby power consumption.
3Measurement precision
If feedback voltage detection is used to control the charging process, then the charging accuracy is improved, but the standby power consumption increases
Solution Approach 1:
The patent employs a simple voltage threshold detection mechanism that consumes minimal power during standby. Instead of continuous feedback voltage detection, the system uses a simple comparator or voltage divider circuit that only activates the high-current charging path when the voltage threshold is reached. This dramatically reduces standby power consumption while maintaining sufficient charging accuracy for the quick start function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables rapid activation of LED units under low luminance conditions with reduced standby power consumption and simpler circuitry, eliminating the need for voltage detection, thus ensuring quick and efficient illumination.
Implementation Method 1
a filter capacitor which is electrically coupled to the loading module in parallel, and is configured to charge its cross voltage using the output driving voltage or discharge its cross voltage to ground
Implementation Method 2
a quick discharging module which is electrically coupled to the loading module and the filter capacitor in parallel, and is configured to discharge the filter capacitor to the ground
Data Source
Figure 1~2
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AI summary
An LED quick activation system includes a driving circuit, a loading module, a filter capacitor, a current control switch, a quick discharging module and a primary controller. The primary controller records a preceding discharging parameter that the filter capacitor requires to discharge its cross voltage from a target charging voltage to the loading module's LED unit's barrier voltage. The primary controller calculates an equivalent charging period of charging the filter capacitor's cross voltage to the target charging voltage using the discharging parameter. The primary controller controls the current control switch to charge the filter capacitor and the loading module using the driving current of a charging amplitude during the equivalent charging period. The primary controller charges the filter capacitor and the loading module using the driving current of a regular amplitude after the equivalent charging period passes.