Instantaneous power down resistant circuit

Abstract

An instantaneous power down resistant circuit is characterized by comprising a one-way redundant power supply output path, boost one-way power supply output and energy storage and relief, wherein one end of a diode is connected with +27V input of an external power supply, and the other end of the diode is connected with +27V output of the external power supply and +27V loop of an output power supply; and when +27V input is normal, a maintenance module is not opened and cannot generate power supply output, and a maintenance module N2 is in a state to be worked; when +27V input is powered down, the maintenance module N2 is opened, a high-voltage energy signal stored by a capacitor is converted and output, the maintenance module 2 works, +27V output is connected, and the instantaneous power down resistant circuit is opened. By the circuit, the quantity of the capacitors is greatly reduced, the reliability is improved, the application range of an instantaneous power down resistant technology is expanded, the instantaneous power down resistant capability is improved, and a 160W control circuit can be driven by the instantaneous power down resistant circuit; and moreover, the load capability is improved by adding and maintaining the quantity of the capacitors, the power supply reliability of the power supply is ensured, and the volume of the instantaneous power down resistant circuit is reduced by over 80%.

Description

technical field [0001] The invention relates to a power supply maintenance circuit for a power failure, and particularly belongs to a secondary power supply maintenance technology. A maintenance module and a maintenance capacitor are used together to provide sufficient maintenance time for the system when the input power drops or fails, and realize the power supply maintenance function. Background technique [0002] Some products need to switch the working power supply when they are working, that is, they need to switch from the external working power supply to the product’s own working power supply. This switching process has potential risks. The power supply may not be switched in time. Abnormal, affecting the realization of the entire product function. [0003] In order to solve the risk of power failure of the input power caused by power switching, the general method is to only use a large-capacity capacitor in parallel between the positive terminal of the input power ...

AI Technical Summary

Problems solved by technology

[0002] Some products need to switch the working power supply when they are working, that is, they need to switch from the external working power supply to the product’s own working power supply. This switching process has potential risks. The power supply may not be switched in time. Abnormal, affecting the realization of the entire product function

[0003] In order to solve the risk of power failure of the input power caused by power switching, the general method is to only use a large-capacity capacitor in parallel between the positive terminal of the input power and the return line, but the capacitor is very large, which is not suitable for the development direction of miniaturization of the control circuit.

Images