Why Incoming Quality Control of LED Power Supply is Important
2021-12-13 11:18:32
Incoming Quality Control is the first quality control hurdle for a company's products before production, if unqualified products are put into the process, it will lead to failure in process or final product , resulting in huge losses to company. IQC not only affects the quality of products, but also affects various direct or indirect costs.
This article we will introduce how to do a good job for incoming quality control of LED power supply.
IQC is mainly to test several important accessories of LED power supply
How to test PCB motherboard?
How to test PCBA board?
How to test transformer?
How to test electrolytic capacitor?
How to test safety capacitor?
How to test insurance tube?
Let’s take all these questions to find the answer in the following
1.The steps of inspecting PCB motherboard of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance:The surface of the PCB motherboard should be flat without bumps and distortion. Green oil should be uniformly distributed over the whole surface, no peeling or covering copper foil. The holes in the PCB board have to meet the production requirements. The copper foil should be bright, without oxidation, warping and oil stains.The screen printing must be clear and true, not fuzzy.
ROHS: Check if the ROHS test report is within effective date and accords with the ROHS limit values.
Performance test: Copper foil conduction test (multimeter), over 95% tin should be covered the tin surface.
2.The steps of inspecting PCBA board of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance：The accessories have no missing parts, dropped parts, reversed parts, wrong parts, crooked parts, high parts, etc. The red glue must not spill over the pads . Solder is well wetted, no tin beads, dross, missed solder, false solder, etc..
3.The steps of inspecting transformer/filter/inductance of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance:The skeleton is intact, without burrs or breakage. The core is good, not broken or loose. No short bridge or false solder on pins. Good hanging wire, no broken. Marking direction should be consistent, not reverse and fuzzy.
Size: The transformer is well assembled with the PCB board and the floating height is less than or equal to 0.5 mm.
ROHS: Check if the ROHS test report is within effective date and accords with the ROHS limit values.
Performance test: Using LCR Meter Tester to test inductance and leakage inductance.
Using Hi-pot tester to test withstand voltage values.
4.The steps of inspecting electrolytic capacitor of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance:The body is intact, not broken, dirty, burrs etc.; Pin polarity differentiation (electrolytic capacitors), no oxidation, deformation. Electrolyte of the electrolytic capacitor is intact and must not overflow. The screen printing must be clear and true, not fuzzy.
Size: Its width, height and pin spacing need to be within tolerance and can be matched to the PCB.
ROHS: Check if the ROHS test report is within effective date and accords with the ROHS limit values.
Performance test: The capacity of the capacitor is tested by LCR Meter testing to check if it is within the tolerance value.
5.The steps of inspecting safety capacitor of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance: The body is intact, not broken, dirty, burrs etc.; Pin polarity differentiation (electrolytic capacitors), no oxidation, deformation.The screen printing must be clear and true, not fuzzy.
Size: Its width, height and pin spacing need to be within tolerance and can be matched to the PCB.
ROHS: Check if the ROHS test report is within effective date and accords with the ROHS limit values.
Performance test: The capacity of the capacitor is tested by LCR Meter testing to check if it is within the tolerance value.
Using Hi-pot tester to test withstand voltage values.
6.The steps of inspecting insurance tube of LED power supply
Packaging : Checking the material name, material code, specification , production date and packaging arrangement
Appearance:The body is intact, no deformation, burrs, scratches, over-gluing, under-gluing, breakage, etc.; the Pin is intact, no breakage, rusting, etc. The screen printing must be clear and true, not fuzzy.
Size: It should accord with standards of samples and acknowledgement
ROHS: Check if the ROHS test report is within effective date and accords with the ROHS limit values.
Performance test: its resistance value should be within the required range by using LCR Meter testing, over 95% tin should be covered the tin surface.
These are some methods to check the main accessories of LED power supply. The core of quality management is quality, the basis is full participation, the purpose is to satisfy customers, the ultimate goal is to form a set of long-term successful management approach. To sum up, quality management generally contains three aspects, the first is incoming quality management, the second is the process quality management, the third is the shipping quality management. Enterprises can break through the above three aspects of quality management, to find the best way to control quality from the source!
