Power input voltage stabilizing circuit

Abstract

The invention belongs to the technical field of aviation electronics and especially relates to a power input voltage stabilizing circuit. The power input voltage stabilizing circuit sequentially comprises a boost circuit channel switch 1, a boost circuit 2, an input power sampling circuit 3, a channel switch control circuit 4, a buck circuit channel switch 5, a buck circuit 6, an internal power generation circuit 7, a direct circuit channel switch 8 and a direct circuit 9 from a power input end to a power output end. The range of working voltage of electronic equipment is extended, the problem that a DC / DC module in electronic equipment cannot work normally due to power input voltage fluctuation is solved, and the working stability of electronic equipment is improved. The whole circuit works independently without the need for any external input and is easy for integrated and modular production.

Description

Technical field [0001] The invention belongs to the technical field of avionics, and particularly relates to a power input voltage stabilizing circuit. Background technique [0002] For avionics powered by 28V DC power supply, it is often necessary to perform secondary power conversion on the input 28V DC power supply to provide power supply for the internal circuits of the electronic device. For reliability considerations, designers often choose high-reliability DC / DC modules to achieve secondary power conversion of input 28 volt DC power. At present, the voltage input range of mainstream high-reliability DC / DC modules at home and abroad is generally 16V to 40V. When the DC 28V power supply is normally supplied, the DC / DC module can realize the secondary power conversion of the input power, but when the input power is in some abnormal working state, the problem gradually emerges. First of all, when the on-board engine is started or the electronic equipment is powered by the on...

AI Technical Summary

Problems solved by technology

First of all, when the engine is started on the aircraft or the electronic equipment is powered by the on-board battery, the input voltage of the electronic equipment can even be as low as 17 volts. Although it is still higher than the 16V lower limit operating voltage of the DC / DC module, due to the long-term cable transmission and the power supply of the electronic equipment The circuit voltage drop caused by the interface circuit at the input end often causes the voltage to drop below 16V when the DC input power reaches the input end of the DC / DC module, causing the DC / DC module to fail to achieve secondary power conversion, resulting in electronic equipment not working properly Secondly, avionics equipment often uses one set of DC power supply for power supply, or two sets of DC power supply for power supply alternately. Transient high voltage higher than 40V, if no suppression measures are taken, will often cause damage to the DC / DC module, resulting in electronic equipment not working properly

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