Parallel Capacitor Drive Layout for Short-Pulse LED Emission
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Solution Overview
Problem
Existing light-emitting devices with a single current path for solid-state light-emitting elements face high parasitic impedance, limiting the effective emission of short-pulse high-peak light, and adding a boosting circuit for higher input voltage complicates the circuit and increases costs.
Innovation Solution
A light-emitting device with multiple capacitors connected in parallel to form multiple driving current loops, where the capacitors and switching element are configured to reduce parasitic impedance by equalizing time constants and distances, thereby reducing pulse width and increasing peak current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single current path is used to connect the capacitor, solid-state light-emitting element, and switching element, then the circuit structure is simple, but the parasitic impedance is high and short-pulse high-peak light cannot be effectively emitted
Solution Approach 1:
The single current path is segmented into multiple parallel current paths by dividing the capacitor into multiple capacitors connected in parallel. Each capacitor forms an independent discharge path with the solid-state light-emitting element and switching element, thereby reducing the overall parasitic impedance while maintaining circuit functionality.
2Power
If the input voltage is increased to boost light power, then the emitted light power increases, but the circuit becomes more complicated and costs increase due to the need for a boosting circuit
Solution Approach 1:
Instead of increasing the input voltage through a boosting circuit, the patent changes the circuit topology by connecting multiple capacitors in parallel. This configuration increases the total capacitance and allows for higher current discharge, thereby increasing light power without requiring voltage boosting circuitry.
3Power
If high voltage is applied to increase light power, then the emitted light power increases, but the pulse width becomes wide which is unsuitable for applications requiring short pulse width and high instantaneous peak
Solution Approach 1:
The single capacitor is segmented into multiple parallel capacitors, each capable of discharging independently. This segmentation allows for higher current discharge (increasing power) while maintaining a short discharge duration (short pulse width), as each capacitor can release its stored energy rapidly without the voltage drop issues associated with a single high-voltage capacitor.
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 configuration achieves efficient emission of short-pulse high-peak light by minimizing parasitic impedance and equalizing time constants across multiple discharge paths, enhancing transient characteristics and current peak values.
Implementation Method 1
a driving capacitor C1 and a driving capacitor C2 connected in parallel to each other, each of the driving capacitors C1 and C2 storing a driving electric charge for the solid-state light-emitting element LD1
Implementation Method 2
a solid-state light-emitting element LD1 that emits light in response to supply of power from the driving capacitors C1 and C2
Data Source
AI summary
The light-emitting device includes a solid-state light-emitting element, driving capacitors and a switching element which are formed on/in a substrate. When the switching element is turned on, the switching element forms a driving current loop for discharging charged electric charges of the driving capacitors to the solid-state light-emitting element. The driving capacitors are configured to store a driving electric charge for the solid-state light-emitting element and are connected in parallel. Each of the capacitors, the solid-state light-emitting element, and the switching element form a plurality of driving current loops. The capacitances of the capacitors are substantially equal, and the capacitors are formed at substantially equidistant positions from the solid-state light-emitting element.