LED Driver Circuit Using Magnetic Amplifier for Compact Packaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing current regulation techniques for LED lightbulbs often result in phase differences between voltage and current, necessitating large capacitance and additional circuitry, which increases the size of the power supply circuit and can cause voltage and thermal stress, limiting the lifespan of semiconductor parts and making it difficult to package within a standard incandescent bulb form factor.
Innovation Solution
A control circuit using a magnetic amplifier and field effect transistors to regulate current without a large capacitor, eliminating phase differences and reducing voltage stress, allowing for a compact and efficient power supply that can be packaged within a standard bulb.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large capacitance is used to facilitate current regulation, then current uniformity is improved, but the physical size of the power supply circuit increases
Solution Approach 1:
The patent removes the large capacitance component from the power supply circuit and replaces it with a current regulation mechanism that uses feedback control and switching elements. This extraction of the problematic component directly reduces the physical size of the circuit while maintaining current uniformity through alternative means.
Solution Approach 2:
The patent replaces the passive electrical component (capacitor) with an active control system involving switching elements and feedback mechanisms. This substitution transitions from a static electrical regulation method to a dynamic control approach, achieving the same current uniformity without the size penalty of large capacitance.
2Measurement precision
If additional circuitry is added for power correction, then power regulation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the power correction function with the current regulation function into a single integrated control mechanism. By merging these functions, the circuit achieves both power regulation accuracy and current uniformity without requiring separate additional circuitry, thereby reducing overall complexity.
Solution Approach 2:
The control circuit in the patent is designed to perform multiple functions simultaneously: current regulation, power correction, and phase difference compensation. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing device complexity while maintaining regulation accuracy.
3Duration of action of stationary object
If voltage stress is reduced in semiconductor parts, then component lifespan is improved, but current regulation capability may be compromised
Solution Approach 1:
The patent implements a feedback control mechanism that continuously monitors the current through the LED and adjusts the switching elements accordingly. This feedback ensures that voltage stress on semiconductor parts is kept within safe limits while maintaining precise current regulation capability, thus extending component lifespan without sacrificing regulation performance.
Solution Approach 2:
The patent uses dynamic switching control to regulate current, allowing the circuit to adapt in real-time to changing conditions. This dynamic approach enables the system to maintain optimal current regulation while preventing excessive voltage stress on semiconductor components, balancing reliability and regulation capability.
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 solution achieves uniform current regulation without phase differences, reduces the size and cost of the power supply, and extends the lifespan of semiconductor parts by eliminating thermal stress, enabling the power supply circuit to be compact enough for standard bulb packaging.
Implementation Method 1
A control circuit using a magnetic amplifier and field effect transistors to regulate current without a large capacitor
Implementation Method 2
A control circuit using a magnetic amplifier and field effect transistors to regulate current
Implementation Method 3
devices that use light emitting diodes or other semiconductor parts to produce electromagnetic radiation
Data Source
AI summary
An apparatus includes circuitry that responds to application to its input of an alternating current input signal by producing at its output an output signal suitable for driving an electronic light generating element. The circuitry includes a regulating section that has a magnetic switch and that causes a current flowing through the output to be maintained substantially at a selected value. A different aspect relates to a method for operating circuitry having an input, an output and a magnetic switch. The method includes causing the circuitry to respond to application to its input of an alternating current input signal by producing at its output an output signal suitable for driving an electronic light generating element, where the magnetic switch is used in regulating a current flowing through the output so as to maintain the current substantially at a selected value.