Products Design and Thorough Quality Verification

UNIFIVE has established a comprehensive testing system to prevent defects in AC/DC Power Adapter and switching power supply Products, extend the service life of its Products, and deliver high quality and safety. Below are some key points of our design and quality verification processes.

Products Design and Quality Verification

Finished Product Inspection

For finished AC/DC Power Adapter and switching power supplies, we conduct inspections in the following six categories. From physical durability to electrical safety and environmental resistance, we comprehensively verify Products quality.

Exterior and Cable Physical Tests

Test Item	Description
Drop Test	Verify durability of the enclosure and wiring against impacts during handling and transportation
Sharp Edge Drop Test	Ensure safety of edges and protrusions and evaluate the risk of injury or damage
Cord Tensile Test and Plug Insertion/Withdrawal Test	Verify wiring durability, connector wear, and contact failure through repeated cycle testing
Ball Pressure Test	Measure the softening temperature of the enclosure resin and confirm shape retention and safety under high-temperature conditions

Key Point:Durability of the enclosure and cables greatly affects on-site reliability. By covering a wide range of physical tests, we achieve both stable operation and safety.

Chemical Testing

Test Item	Description
Salt Spray Test	Verifies the anti-rust performance and corrosion resistance of metal components. Assumes use in diverse environments such as coastal areas
Humidity Test	Verifies normal operation under high-humidity conditions. Evaluates potential failures caused by moisture penetration into circuit boards and components in advance
RoHS Inspection	Confirms compliance with environmental regulations such as the EU RoHS Directive

Key Point: From the design stage, we select materials with reduced environmental impact and high environmental durability to ensure quality that meets international standards.

Reliability Testing

Test Item	Details
Operation Test	Verification of stability under continuous operation and abnormal load conditions
Vibration Separation Test / Thermal Shock Test	Evaluation of performance retention against vibration and temperature changes beyond assumed conditions
Aging Test	Early detection of temporal changes and defects after long-term continuous use, pursuing designs resistant to deterioration
Insulation Resistance Test / Withstand Voltage Test	Prevention of electric leakage and short circuits, and verification of insulation performance, the foundation of the power supply
Blanket Wrapping Test	Products is wrapped in a blanket and energized at rated load to check for smoke or ignition and to confirm deformation of the case surface

Key Point: We thoroughly simulate real-world usage environments and conduct multilayered verification. Including measures against overheating risks, we pursue reduced failure rates and improved safety.

EMC Testing

Test Item	Description
Electrostatic Discharge Test (EFT Test)	Verifies resistance to external electrostatic discharge and prevents malfunction or failure of control systems
Surge Test (Lightning Surge)	Verifies resistance to lightning surges
DIP Test	Verifies resistance to voltage dips (momentary voltage drops)
Noise Immunity Test (High-Frequency Noise Test)	Minimizes impact on peripheral devices and verifies a design that considers the safety of surrounding circuits

Key Point: Power supply noise issues are risk factors that can lead to company-wide losses and complaints. We provide Products that comply with international standards by covering a full range of EMC tests.

Mechanical Testing

Test Item	Description
Single-Axis Vibration Test / Combined Vibration Test	Evaluates the impact on mounted circuit boards and internal wiring under assumed vibration conditions during use and transportation
Case Characteristic Verification / AC Pin Push Test	Verifies the fixing strength of the power plug and the deformation resistance of the case
External Force Test / Shock Drop Test / Unit Drop Test	Quantitatively evaluates damage when impact is applied and verifies strength and safety

Key Point:Structural robustness and ease of handling are directly linked to on-site production efficiency. We conduct multifaceted verification to ensure the Products can be handled with confidence.

Environmental Testing

Test Item	Description
Thermal Shock Test	Verifies resistance to rapid temperature changes
High-Temperature Operation Test / Low-Temperature Operation Test	Demonstrates performance retention under extreme temperature environments. Suitable for use in freezers and high-heat environments
High-Temperature and High-Humidity Storage Test	Confirms that there is no degradation in quality or performance during long-term storage

Key Point:By assuming various usage environments and comprehensively testing resistance to temperature and humidity, we ensure stable operation in all environments.

Component Inspection

We conduct thorough quality verification not only of finished products but also at the component level. The main inspection items for each key component are as follows.

Component	Main Inspection Items
PCB	Thermal expansion test, measurement test, RoHS inspection
MOSFET	EMI test, regulatory inspection, heat generation measurement
Diode	EMI test, destruction test, rectification capability measurement
Transformer	DCR measurement, winding resistance evaluation, temperature rise test
Wire	Bending test, combustion test, tensile test, salt spray test, disassembly inspection (soldered sections), contact resistance inspection
Enclosure	Combustion test, insulation test, ball pressure test, steel ball drop test
Electrolytic Capacitor	Withstand voltage increase test, capacitance change test, lifetime evaluation, capacitance loss measurement, terminal pull test, DC drop resistance measurement

Point: Based on the belief that "quality begins with components," we conduct rigorous testing not only on key components but also down to the smallest details to minimize the occurrence of failures and defects.

For more details about our quality control system and testing facilities, please also see the following pages.

Our Commitment to Quality:
Our Commitment to Quality (Top Page) / Quality Control System for Our AC/DC Power Adapter / About Reliability Testing / Management Methods for the Ultrasonic Welding Process of Enclosures / Traceability