Direct current power supply service life reliability improvement circuit

Abstract

The invention relates to the technical field of direct current power supplies, and in particular relates to a direct current power supply service life reliability improvement circuit. Both ends of a capacitor C1 on the input end of a direct current switching power supply conversion circuit on the input end of a direct current power supply or both ends of a capacitor C4 on the output end are connected in parallel with a backup circuit composed of a varistor Ra, a temperature switch K and an electrolytic capacitor Ca. A capacitor C4 on the output end of the direct current switching power supplyconversion circuit is connected in parallel with a circuit which is capable of detecting ripple voltage and consists of a resonant inductor Lb, a light-emitting diode VDb and a resonant capacitor Cb.The service life of the existing direct current power supply product can be greatly improved. A power supply with signs of aging can be found out at the first time. An aging and undamaged power supplyboard card is removed as soon as possible. The operational reliability of important equipment such as power control protection equipment can be effectively improved. The probability of accidents caused by equipment abnormalities is reduced.

Description

technical field [0001] The invention relates to a DC circuit, in particular to a DC power supply life reliability improvement circuit. Background technique [0002] DC switching power supply is widely used. In the power industry, DC switching power supply almost occupies the share of power supply modules of all control and protection equipment. However, switching power supply is limited by the technical problems of internal capacitors, often aging slowly, and sometimes giving power secondary The operation of the equipment brings great hidden dangers. According to incomplete statistics, many defects or accidents in the control and protection systems of substations come from the power supply problem of the internal power supply. This problem is particularly obvious in the converter station. Accidents of power transmission blocking have occurred repeatedly. Compared with traditional linear regulated power supplies, switching power supply modules have the advantages of small siz...

AI Technical Summary

Problems solved by technology

Such a high switching frequency puts forward higher requirements on the filter capacitor at the output end. Since the ordinary non-polar capacitor has a small capacity, the filter capacitor at the output end must use an electrolytic capacitor. The electrolytic capacitor has a large high-frequency loss and will The heat will cause aging and dryness, but the electrolytic capacitor is not damaged suddenly, but gradually aging, which leads to the decrease of the filtering effect of the power module and the increase of the output ripple year by year.

The control and protection board has high requirements on the power supply, and a slight fluctuation will cause the program to go wrong and run away. When the ripple of the power module increases to a certain level, it will inevitably have a significant impact on the operation of the board. Increases in stability, ripple, internal resistance, and AC components can easily lead to sudden failures or crashes of related boards, and even wrong tripping and locking instructions. Wave detection technology, so that the hidden dangers caused by the aging of the switching power supply are always unresolved

Images