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May 18, 2020

Power adapter stability is necessary

(1) the stability of the power adapter is always beneficial to the electronic equipment. We know that any electrical, electronic products, in the design, the production process is specified in the working voltage. When working at the specified voltage, the performance, efficiency and service life of the electronic equipment can reach the better indexes of the original design. The specified operating voltage is usually referred to as the rated voltage of the electronic equipment. Stable and reliable Power Supply has also become one of the key research directions of designers.

If the actual power adapter voltage is higher or lower than a certain percentage of the allowable value of the rated voltage, such as ±10% or ±15%, the electronic device will be in an abnormal working condition. For example, floodlights, the voltage below a certain value when the light is very dark, some fluorescent lights even can not start; When the voltage is too high, the filament is easy to burn off and the service life is shortened a lot.

(2) to ensure the accuracy of measurement or test results. In general electrical measurement or test, the measurement or test results often introduce errors due to the fluctuation, ripple, noise and other reasons of the voltage or load current of the power adapter. Therefore, the corresponding power adapter must be stabilized. Here, the requirements of the stable power supply adapter not only include the requirements of the output voltage or current stability, but also include the requirements of ripple, noise, temperature drift, time drift and other indicators.

(3) in order to ensure the measuring accuracy of the instrument. Some precision instruments, such as nuclear magnetic resonance (NMR) spectrometers, require their magnetic field coils to produce a change in field intensity of less than 10-6t. Therefore, the stability and ripple of the excitation power adapter are also put forward high requirements.

These are just a few common examples. In conclusion, with the development of electronic technology and electronic equipment, the demand for stable power adapters will increase accordingly.

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So, what stability items do we typically test?

Time stability: the input and output environment is unchanged, observe the power supply with time output changes, often with the temperature rise test test.

Environmental stability: the power supply is put into the environmental test box to test whether the power supply can guarantee the performance of temperature output under certain constant environmental conditions, or under various cold and heat shocks and humidity shocks.

Input stability: test the changes in the input and the impact of the test on the output.

Output stability: the input end of the test is unchanged, and the output end is changed. The variation is also divided into two types, load adjustment within the load capacity and protection stability outside the load capacity.



Best Regards,

Una Yang

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