Resonant Switching Power Supply for LED Test Device
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Solution Overview
Problem
Existing test devices for substrates with image sensors face challenges in suppressing power loss and accurately adjusting the amount of light for testing.
Innovation Solution
A test device with a mounting table and an irradiation device that includes a light emitting section with multiple LEDs, a fixed power supply using switching power supplies that perform resonance switching, and a constant current section with parallel first and second constant current sources to adjust current with high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single constant current source is used to adjust current, then the device complexity is reduced, but the manufacturing precision of current adjustment is insufficient
Solution Approach 1:
The constant current source is divided into two independent sources: a first constant current source for coarse adjustment and a second constant current source for fine adjustment. This segmentation allows each source to operate at optimal resolution levels, achieving high overall precision without requiring a single overly complex high-precision source.
Solution Approach 2:
The patent introduces a dual-resolution dimension to current adjustment by parallelizing two constant current sources with different precision levels. This transforms a single-dimensional adjustment problem into a two-dimensional solution space where coarse and fine adjustments can be independently optimized and combined.
2Loss of energy
If conventional power supply is used in the irradiation device, then the device complexity is reduced, but the power loss increases
Solution Approach 1:
The patent replaces conventional linear power supply mechanisms with switching power supplies that utilize resonance phenomena. This substitution transitions from a continuous analog power delivery system to a switched-mode system, significantly reducing power loss through efficient energy transfer and minimal dissipative heating.
Solution Approach 2:
The patent changes the operating parameters of the power supply by implementing switching operation at resonant frequencies. This parameter change enables the system to operate in a high-efficiency regime where power loss is minimized through synchronized switching and resonant energy transfer, rather than continuous linear regulation.
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 effectively suppresses power loss and allows for precise adjustment of light intensity over a wide range, enhancing the accuracy of substrate testing.
Implementation Method 1
The fixed power supply includes a plurality of switching power supplies configured to perform switching using a resonance phenomenon
Data Source
AI summary
A test device includes a mounting table configured to mount a substrate; an irradiation device configured to irradiate the substrate mounted on the mounting table with test light; a tester configured to test the substrate that has received the test light. The irradiation device includes a light emitting section in which a plurality of LEDS are connected; a fixed power supply configured to output power to be supplied to the light emitting section; and a constant current section provided between the light emitting section and the fixed power supply. The fixed power supply includes a plurality of switching power supplies configured to perform switching using a resonance phenomenon. The constant current section includes a first constant current source and a second constant current source connected in parallel, the first constant current source being configured to receive the power of the plurality of switching power supplies and adjust a current in a first resolution, and the second constant current source being configured to receive the power of the plurality of switching power supplies and adjust a current in a second resolution less than the first resolution.