Power protection device

Abstract

The invention provides a power protection device, comprising a comparing unit, a reverse unit and a power switch unit, wherein the comparing unit is connected to a power source in a coupling manner and is used for receiving an input signal and a preset signal, comparing the potential values of the input signal and the preset signal to generate a comparing signal; the reverse unit is connected to the comparing unit in a coupling manner and is used for receiving the comparing signal to generate a reverse signal; and the power switch unit is connected to the power source and the reverse unit in acoupling manner and is used for receiving the input signal and the reverse signal. When the potential value of the input signal is higher than the potential value of the preset signal, the reverse signal controls the breakover of the power switch unit and the power switch unit outputs an output signal; when the potential value of the input signal is lower that the potential value of the preset signal, the reverse signal stops controlling the power switch unit and the power switch unit outputs no signal. In the invention, only the comparing unit, the reverse unit and the power switch unit areutilized to be matched, thus having simple design, easy acquisition of the electronic building bricks, low price, and being capable of achieving the function of short circuit protection of the outputpower source.

Description

technical field [0001] The invention relates to a protection device, in particular to a power supply protection device. Background technique [0002] With the advancement of science and technology, the functional requirements of electronic devices are getting higher and higher, making the internal circuits of electronic devices more and more sophisticated, so the protection of circuits and components of electronic devices cannot be ignored, and will affect the reasons for damage to circuits and components There are many, and the output power of electronic devices is one of them. [0003] When the electronic device is connected to the power supply, it will convert the received power into an appropriate power output to provide the internal circuit of the electronic device, and the output power may sometimes cause the electronic device to short circuit due to some reasons. This phenomenon will not only affect the electronic In addition to the normal operation of the device, it...

AI Technical Summary

Problems solved by technology

[0003] When the electronic device is connected to the power supply, it will convert the received power into an appropriate power output to provide the internal circuit of the electronic device, and the output power may sometimes cause the electronic device to short circuit due to some reasons. This phenomenon will not only affect the electronic In addition to the normal operation of the device, it is more likely to cause damage to the entire system, so improving the short-circuit protection technology of the output power supply has become one of the key items of the electronic device

[0004] At present, most of the power protection devices on the market are designed using components such as relays. However, due to the large size of the components used, and some components need to be controlled by a microcontroller, the input voltage and output voltage of the electronic device may also be It is not necessarily completely insulated, so it will not only increase the size of the electronic device, increase the cost, but also reduce the overall reliability and lifespan

Images