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What is the reason why the output voltage of a switching power supply is lower than the standard voltage?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.16
In the field of switch mode power supply technology, people are developing related power electronic devices and switch frequency conversion technology at the same time. The two promote each other, and switch mode power supplies are expanding towards the direction of light, small, thin, low noise, high reliability, and anti-interference with a growth rate exceeding two digits every year. However, in the use of switching power supplies, sometimes the output voltage may be lower than the standard voltage. What is the reason for this?


480W Din Rail Switching Power Supply

The reason why the output voltage of the switching power supply is lower than the standard voltage:

(1) The occurrence of this situation in the switching power supply of the new device may be due to poor output power. The power of the selected power source should be sufficient to avoid the phenomenon of "a small horse pulling a big cart"; It is also possible that the output of the power supply does not meet the design specifications, which is a quality issue of the product itself. In addition, at high temperatures, the output power will decrease. If it is necessary to reduce the rating for use, manufacturers generally provide output characteristic curves at different temperatures.

(2) The working voltage provided by the 220V AC voltage input and rectification filtering circuit to the switching tube is unacceptable and exceeds the control range of the pulse width adjustment circuit.

(3) Overcurrent in the load circuit leads to an increase in the load of the switching power supply, resulting in a decrease in output voltage.

(4) The original power output suddenly drops. First, check if the load has changed. If the load is normal, it is likely that the internal components are damaged. If possible, you can check if the switch equipment of the product is damaged, otherwise it can only be sent for repair or replaced with a new one.

(5) On/off switching error, the power switch is in standby mode when the online scanning circuit starts working. This type of fault applies to machines without a backup power supply.

(6) The end of the switching power supply is in a state between power on and standby due to a fault, resulting in the output voltage of the switching power supply being lower than the normal value and higher than the standby value.

The above is the reason why the output voltage of the switching power supply is lower than the standard voltage. I hope this article is helpful to everyone.
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