Automatic recovery DC overvoltage protection circuit of unmanned aerial vehicle

Abstract

The invention relates to an automatic recovery DC overvoltage protection circuit of an unmanned aerial vehicle, and aims at providing the automatic recovery DC overvoltage protection circuit which is diverse in function and high in reliability. The automatic recovery DC overvoltage protection circuit comprises a first comparator, a second comparator, a magnetic latching relay, a contactor and a reference power supply, wherein a two-way comparator of which the model number is LM193JG is adopted as the first comparator and the second comparator. The circuit can be in an overvoltage protection state, a super-overvoltage protection state and a normal automatic recovery circuit state separately according to different connection and disconnection modes of various pins of the first comparator and the second comparator; the overall system is not frequently switched due to unstable voltage when transient and overvoltage protection requirements are met; automatic recovery of power supply can also be achieved; the condition that the application risk can be greatly reduced is ensured; and the reliability and the safety of an onboard power supply system are further improved.

Description

technical field [0001] The invention relates to the field of aviation electrics, in particular to an automatic recovery DC overvoltage protection circuit for an unmanned aerial vehicle. Background technique [0002] The power supply and distribution design of unmanned aerial vehicles is an aviation electrical system that has attracted more and more attention in the past ten years. Electricity, among them, overvoltage protection is a very important component. The basic principle of overvoltage protection is to set an appropriate threshold through the comparator. When the reference power supply voltage of the generator is higher than a certain voltage value and reaches a certain time, the comparator triggers, generates a switching signal, controls the relay, and realizes the reference power supply and the bus bar. Off-grid, thereby protecting other electrical and electronic equipment on board. [0003] The traditional overvoltage protection circuit has anti-delay characteris...

AI Technical Summary

Problems solved by technology

[0003] The traditional overvoltage protection circuit has anti-delay characteristics, but the function is single. It does not have a direct switching function without anti-delay when the voltage exceeds the voltage, and there is no self-recovery function when the voltage returns to normal voltage, and requires the entire During the process, there is no frequent switching of the main contactor caused by instantaneous voltage instability, which has caused great limitations to the use of overvoltage protection circuits in the field of drones.

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