LED Power Supply with Overcurrent Protection Circuit
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Solution Overview
Problem
Existing display devices using fluorescent lamps face issues such as power consumption, heating, fragility, and varying luminance, while LED-based systems require precise voltage control to prevent damage from excessive current or noise, necessitating a stable power supply and protection mechanism.
Innovation Solution
A power supply system that includes a signal converting unit, a DC-DC converting unit, and a light source protecting unit, which converts AC voltage to DC voltage, adjusts voltage magnitude, and suspends operation when voltage exceeds predetermined levels, using a transformer, switching unit, inductor, and sensing unit to provide a stabilized driving voltage to LEDs while preventing overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC voltage is converted to DC voltage with magnitude changes for LED driving, then LED can be used as light source with lower power consumption and longer lifetime, but excessive current or noise may destroy the LEDs
Solution Approach 1:
The patent implements preliminary protection actions by incorporating a light source protecting unit that proactively monitors and controls the driving voltage before excessive current can damage the LEDs. The unit includes a sensing unit that detects voltage levels and a switching unit that preemptively interrupts current flow when threshold values are approached, preventing overcurrent damage before it occurs.
Solution Approach 2:
The patent employs feedback mechanisms through the sensing unit that continuously monitors the DC voltage magnitude and provides real-time information to the light source protecting unit. This feedback loop enables dynamic adjustment of the driving voltage, ensuring it remains within safe operating ranges for the LEDs while maintaining efficient operation.
2Ease of operation
If voltage magnitude is changed for LED operation, then LED can operate at predetermined voltage levels, but noise and excessive current may flow to LEDs
Solution Approach 1:
The patent introduces a light source protecting unit as an intermediary between the DC-DC converting unit and the LEDs. This intermediary component filters and condition the converted DC voltage, removing noise and preventing excessive current spikes before the voltage reaches the LEDs, thus protecting them while maintaining controlled operation.
Solution Approach 2:
The patent implements cushioning protection by designing the light source protecting unit with voltage threshold detection and current limiting capabilities that cushion against voltage fluctuations and noise. The sensing unit detects potential harmful voltage levels beforehand, and the switching unit provides protective cushioning by interrupting current flow before damage can occur.
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 ensures stable and efficient operation of LEDs by maintaining a predetermined voltage range and preventing damage from overcurrent, enhancing the reliability and longevity of the display device.
Implementation Method 1
a transformer generating a signal with a predetermined magnitude based on the signal from the signal inputting unit
Implementation Method 2
an inductor averaging the square wave voltage from the switching unit to generate an average voltage
Data Source
AI summary
A power supply includes a light source, a signal converting unit converting an externally supplied AC voltage into a DC voltage, a DC-DC converting unit converting a magnitude of the DC voltage, and a light source protecting unit. The light source protecting unit outputs the DC voltage of a predetermined range as a light source driving voltage to supply a stabilized source driving voltage to the light source and suspending an application of the light source driving voltage to the light source when a magnitude of the light source driving voltage is larger than a predetermined value, based on an externally supplied control signal.