Constant voltage circuit of light-emitting diode (LED) navigation aid lamp and navigation aid lamp provided with the same

Abstract

The invention provides a constant voltage circuit of a light-emitting diode (LED) navigation aid lamp and the navigation aid lamp provided with the same. The constant voltage circuit comprises a rectifying circuit, a tank circuit, a voltage detection and control circuit, an isolating circuit and a discharging circuit. The rectifying circuit is used for converting alternating current provided by an external constant current source into direct current output, the tank circuit is used for storing energy of the direct current output, the voltage detection and control circuit is used for monitoring the voltage values of the constant voltage output and controlling the discharging circuit to work, the isolating circuit is used for preventing the energy stored in the tank circuit from backflow, and the discharging circuit is connected at the output end of the rectifying circuit and used for being controlled by the voltage detection and control circuit to work. The constant voltage circuit achieves efficient conversion of current and voltage through charging of the tank circuit by rectified direct current, meanwhile, the voltage detection and control circuit detects output voltage of the tank circuit and controls the discharging circuit to charge and discharge so as to stabilize the output voltage in a predetermined range and ensure constancy of the output voltage.

Description

technical field [0001] The invention relates to a driving circuit of a lamp, in particular to a constant voltage driving circuit of a lamp. Background technique [0002] At present, the navigation aid lamps used in most domestic airports are still lamps with traditional light sources, such as metal halide lamps. The lamps using this light source have the advantages of simple circuit, safety and reliability, but the life of the halogen lamp light source is short, generally about 1000 hours, so the lamps using the halogen lamp need to replace the light source frequently, and the maintenance cost is extremely high. [0003] With the continuous development of solid-state light source LED technology, it has become possible to apply LED lighting technology to the field of airport aviation lighting. The LED light source has the advantages of long life and energy saving. More importantly, it can avoid the problem of high maintenance cost caused by frequent replacement of the light ...

AI Technical Summary

Problems solved by technology

[0005] A constant voltage circuit in the prior art includes: a rectification filter module, a switch circuit module and a comparator hysteresis module. The AC constant current source is connected to the rectifier module through the switch circuit, and the output of the rectifier module is the output of the constant voltage circuit. When the hysteresis module detects that the output voltage is greater than the set value, the switch circuit is cut off, and the output of the subsequent rectifier module will stop, resulting in an unstable output voltage and poor stability.

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