Diode Light Source Driver Circuit Topology for Parasitic Inductance Management
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Solution Overview
Problem
Pulsed diode light sources face challenges due to parasitic inductances, which affect switching frequency and lead to residual currents, requiring innovative driver circuits to manage energy storage and flow efficiently.
Innovation Solution
A driver circuit for diode light sources that includes an inductor connected in parallel to the diode, a switching element to control current flow, and a current limiter to set desired current levels, allowing for efficient energy storage and release to achieve fast switching without resistors, thereby reducing parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a diode light source is operated in pulsed mode to prevent damage and address design concerns, then the diode light source can operate at higher powers, but parasitic inductances cause residual currents that affect switching frequency and reduce performance
Solution Approach 1:
The patent extracts and removes parasitic inductances from the driver circuit by using an ideal inductor model without series resistance, eliminating the source of residual currents that destabilize switching frequency while maintaining pulsed operation at higher powers
Solution Approach 2:
The patent introduces a carefully designed inductor as an intermediary energy storage element that transfers power between the power supply and diode light source without introducing parasitic effects, enabling clean pulsed operation that maintains both high power and stable switching frequency
2Device complexity
If traditional driver circuits are used with parasitic inductances, then the circuit can be simpler in design, but residual currents reduce switching frequency and energy efficiency
Solution Approach 1:
The patent changes the electrical parameters of the inductor by specifying ideal characteristics (zero series resistance, controlled parasitic capacitance), transforming a conventional lossy inductor into an ideal energy storage element that enables high-frequency switching without residual currents
Solution Approach 2:
The patent implements periodic pulsed operation of the diode light source where the switching element alternates between on and off states, with the ideal inductor enabling clean energy transfer during each cycle without residual currents that would interfere with the periodic switching action
3Ease of operation
If resistors are used to control current flow, then current can be limited, but energy efficiency decreases and switching speed is reduced
Solution Approach 1:
The patent replaces the mechanical/resistive current control method with an electromagnetic field-based control using an ideal inductor and switching element, substituting resistive power dissipation with reactive energy storage and release, thereby eliminating energy loss while maintaining current control capability
Solution Approach 2:
The patent uses dynamic switching of the switching element to control current flow through the inductor, replacing static resistive control with dynamic electromagnetic control that adjusts current in real-time without energy-dissipating resistors, improving both switching speed and energy efficiency
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
This solution enables faster switching and higher energy efficiency, allowing the diode light source to operate at higher voltages with reduced parasitic components, improving switching speed and efficiency, especially at high frequencies.
Implementation Method 1
an inductor configured to store energy and to provide power for the diode light source
Data Source
AI summary
An apparatus is disclosed in some embodiments. The apparatus comprising; a diode light source having a first terminal and a second terminal, an input configured to receive power form an output of a power supply, an inductor configured to store energy and to provide power for the diode light source, the inductor having a first terminal connected to the first terminal of the diode light source, and a second terminal connected to the second terminal of the diode light source, wherein the diode light source and the inductor are connected in parallel, a switching element configured to control a flow of a current through the inductor.