Power supply with duplex over-temperature protection circuits

Abstract

The invention discloses a power supply with duplex over-temperature protection circuits, which comprises a main conversion module, a pulse-width modulation / over voltage protection (PWM / OVP) control module, a follow current rectifying and filtering module and a primary temperature protection module, wherein an external power supply is output to the follow current rectifying and filtering module through being covered by the main conversion module and is output to a load after being rectified by the follow current rectifying and filtering module, the PWM / OVP control module controls the work of the main conversion module, the main conversion module comprises a high frequency converter, a primary temperature protection module is installed with the high-frequency transformer, in addition, temperature sensing results are fed back to a temperature feedback lead pin (RT end) of the PWM / OVP control module, and a temperature fuse (FT1) is connected in series onto a primary winding of the high-frequency converter. The power supply adopts the duplex protection, so that potential safety hazards such as over-temperature danger, fire catching and the like caused by too high temperature rise after the continuous work of the power supply are effectively prevented, further, the personnel and property safety of users can be protected, and the high-reliability requirement of the power supply is realized.

Description

technical field [0001] The invention discloses a power supply, in particular a power supply with double over-temperature protection circuits. Background technique [0002] With the rapid development of electronic technology, the relationship between power electronic equipment and people's work and life is becoming increasingly close, and all electronic equipment is inseparable from high-reliability power supply, so DC switching power supply begins to play an increasingly important role, one after another Entering various electronic and electrical equipment fields, DC switching power supplies have been widely used in the power supplies of electronic equipment such as information technology, audio and video, and household appliances and toys. At the same time, with the development of many high-tech technologies, including high-frequency switching technology, soft switching technology, power factor correction technology, synchronous rectification technology, intelligent...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the control circuit in the switching power supply, transistors, integrated devices, and power conversion devices have poor ability to withstand electrical and thermal shocks, which brings great inconvenience to users during use, and there are dangers of overheating and fire, etc. Potential safety hazards will cause personal safety and property damage to users

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