Airport navigation light dimmer analog load cabinet

Abstract

The invention discloses a simulated load cabinet for an airport navigation light dimmer, which is characterized in that the simulated load cabinet comprises: a cabinet body and a simulated load placed on the cabinet body; The output terminals of the optical device are connected, and include: N power resistance branches connected in series; a plurality of switch circuits connected in parallel with each power resistance branch respectively; The power resistor branches connected in parallel are connected to the simulated load or are bypassed and disconnected from said simulated load. The invention can realize the continuous adjustment of the simulated load power with 25 watts as the minimum step size, so as to meet the requirements of various output powers of the whole series of standard dimmers.

Description

technical field [0001] The invention relates to the field of airport navigation aids, in particular to a simulated load cabinet for dimmers of airport navigation lights. Background technique [0002] The airport navigation aid lighting system is a necessary visual aid to ensure the normal take-off and landing of aircraft at night or in low visibility conditions. Among them, the constant current dimmer is the core equipment in the airport navigation lighting system. Its performance determines the stability, reliability and economy of the airport navigation lighting system, and it is related to the safety of aircraft takeoff and landing and taxiing. Closely related. The load of the constant current dimmer is composed of halogen bulbs distributed in the flight area connected in series through the isolation transformer and the loop cable. At present, the problems in the field of airport navigation aids are: [0003] 1. For new airport users or users who purchase new machines,...

AI Technical Summary

Problems solved by technology

[0003] 1. For new airport users or users who purchase new machines, after the dimmer is delivered to the site and installed in place, a stand-alone test must be carried out. The usual practice is to run it for a period of time with no load or load short-circuit (generally one week). If there is no fault, then connect the real light load to test, but in the test process, due to the performance problem of the dimmer, the phenomenon of burning a large area of ​​the circuit or even the light load of the entire circuit occurs from time to time, which increases the test cost and has the possibility of repairing the lamp risk

[0004] 2. For general old airport users, after the dimmer fails, the lighting station will replace the parts for repair on site, but the repaired dimmer may not be able to return to normal, and there is also the risk of circuit lamp burning and emergency repair

[0005] 3. For dimmer manufacturers, product testing and aging must also be carried out. The test bench used is usually composed of hundreds of real light loads connected in series. Since each dimmer needs to be aged for dozens of hours, the dedicated The life of halogen bulbs is only about 2000 hours and the price is expensive, which increases the production cost of dimmer manufacturers

[0006] Existing load cabinets, whether they are three-phase, single-phase or DC, high voltage or low voltage, water resistors, dry resistors or oil-immersed resistors, are usually products suitable for generators or voltage sources, but none of these products can be applied to Navigation light dimmer test field, this is because the navigation light dimmer is a high-voltage, low current, medium and small power single-phase AC adjustable current source high-end equipment, its rated output current is 6.6 amperes, divided into 2.8, 3.4 , 4.1, 5.2, 6.6 (ampere) five levels of light intensity, the highest rated voltage is 4545V. For 15KVA, 20KVA, 25KVA, 30KVA series products, the no-load output power is short-circuited (the voltage source does not allow the load to be short-circuited), and the load increase and decrease adjustment must be carried out with power on to test the constant current index and dynamic characteristics of the dimmer. During the process of increasing or decreasing the current source is not allowed to open circuit, the actual output power is proportional to the load resistance value (the actual output power of the voltage source is inversely proportional to the load resistance value)

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