In the field of switching power supply technology, people are developing related power electronic devices and switching frequency conversion technology, and the two promote each other to promote the switching power supply to develop in the direction of light, small, thin, low noise, high reliability and anti-interference with a growth rate of more than two digits every year. However, in the use of switching power supply, sometimes the output voltage is lower than the standard voltage, what is the reason for this? Let's take a look with Mingjinfang!
Reasons why the output voltage of the switching power supply is lower than the standard voltage:
1) If this happens in the switching power supply of the new device, it may be that the output power is not good. The power of the selected power supply should be left sufficient to avoid the appearance of "small horse-drawn carts"; It may also be that the output of the power supply does not meet the design indicators, which is a quality problem of the product itself. In addition, at high temperatures, the output power will be reduced, and if you want to derate, the general manufacturer will provide output characteristic curves at different temperatures.
2) The working voltage supplied to the switch by the 220V AC voltage input and rectifier filter circuit is unacceptable, which is beyond 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 drop in the output voltage.
4) Sudden drop in the output of the original power supply. The first thing to see is if the load has changed. If the load is normal, it is most likely that the internal components are damaged. If possible, you can inspect the switchgear of the product for damage, otherwise it can only be sent for repair or replacement with a new one.
5) The on/off switching is wrong, and the switching power supply is in standby mode when the scanning circuit starts working. This failure applies to machines that do not have backup power. The CPU power is taken from the same power supply. Non-auxiliary power supply.
6) The end of the switching power supply is in the state between power-on and standby due to the fault, resulting in the output voltage of the switching power supply being lower than the normal value and higher than the specific standby value.
The above reasons why the output voltage of the switching power supply is lower than the standard voltage are shared here for you, I hope this article will be helpful to you. If you have other questions about switching power supply, you can pay attention to Mingjinfang or leave a message, we look forward to working with you!