What test items are included in the stability test of switching power supply adapter?

The design, manufacture, and quality control of switching power supplies require sophisticated electronic equipment to simulate the actual operating characteristics of the power supply (i.e., the specifications) and to verify that they pass. Switching power supplies have many different configurations (single output, multiple outputs, positive and negative polarity, etc.) and combinations of output voltage, current, and power, and therefore require flexible and diversified test equipment to meet the needs of many different specifications. When verifying the quality of a power supply, the following are general functionality tests, described in detail as follows:

*Functions:

-Output Voltage Adjustment (Hold-on Voltage Adjust)

This is the first time a power supply has been used in a power supply.

-Hold-on Voltage Adjust (HVA)

-Line Regulation

-Load Regulation

-Conmine Regulation

-Output Ripple & Noise (RARD)

This test is to determine if a system is capable of delivering the highest level of power to the system and the lowest level of power to the system. Noise, RARD)

-Input Power, Efficiency

-Dynamic or Transient Response

-Power Good/Fail Time

-Over Power Protection (OPP, Over Power Protection)

*Safety Specification Tests:

-Input Current, Leakage Current, etc.

-Voltage Withstanding Insulation: Power input to ground, power output to ground; circuit board wiring must have safety spacing.

-Temperature resistance: Components must be flame-resistant to meet safety specifications, and operating temperatures must be within safety specifications.

-Chassis grounding: below 0.1 ohm to avoid the risk of electrical shock and leakage.

-Variable Voltage Output Characteristics: Open Circuit, Short Circuit, and Maximum Voltage Ampere (VA) Output

-Abnormal Tests: Cooling Fan Stops, Incorrect Voltage Selector Switch Setting

*Electromagnetic Compliance Tests:

The power supply needs to be in compliance with CISPR 22, CLASS B, Transmission and Distribution Standard for the Power Management System (PMS). The power supply is tested under the following three load conditions:

Each output is unloaded, each output is 50% loaded, and each output is 100% loaded.

-Conducted interference/immunity: Conducted interference/immunity through the power line

-Radiated interference/immunity: Radiated interference/immunity through the magnetic field

*Reliability test:

Aging life test: High temperature (approx. 50-60 degrees) and long time (approx. 8-24 hours) full load test. Switching test temperature rise test high and low temperature test

*Other Tests:

-ESD: Electrostatic Discharge (caused by people or objects through direct contact or spaced discharge) in the 2-15KV of ESD pulse, to be tested on each surface area of the object should be performed 20 consecutive times of the electrostatic discharge test, the output of power supply should continue to work without generating sudden bursts of electricity. The output of the power supply should continue to work without generating a surge (Glitch) or interrupt (Interrupt), direct ESD contact should not cause over-excitation (Overshoot) or under-excitation (Undershoot) of the situation beyond the regulated range, and over-voltage protection (OVP), over-current protection (OCP). In addition, an ESD discharge voltage of up to 25KV will not cause a component failure.

-EFT: Electrical Fast Transient or burst a string of switching noise through the power line or I / O line of the conductive interference (caused by the power supply or building).

-Surge: High-energy transient noise via power lines (caused by flickering lights).

-VD/I: Dips and Interrupts (caused by faults or errors in the power distribution system, such as overloading of the power supply or tripping of air switches)

-Inrush: Inrush of power-on input current, the effect of switching power supplies on the power supply system.