The application of LED lamps is more and more extensive, but the life of traditional driving power sources is far lower than the life of LED light sources. The driving power source with short life may destroy the LED industry, and the advantages of LED lamps will not be realized. Mr. Zhu Yibo from Hangzhou Zhongheng Paiwei Power Co., Ltd. introduced a high-voltage DC-powered LED lighting system at the Driver, Power and Control Technology Branch.
In order to facilitate the replacement of ordinary lighting fixtures with LED lamps, various switch-type driving power sources are installed in every LED lamp in the world. The theoretical life of LED light source can reach 100,000 hours, and the actual service life is more than 70,000 hours. However, in the switching power supply that supplies constant current drive to LED, the actual life of optocoupler and electrolytic capacitor is far less than 10,000 hours, and The structure of the switching power supply is complicated. Therefore, in the LED lighting system (especially in the case of harsh environments such as street lamps and tunnels), the phenomenon of interrupted illumination due to the failure of the driving power supply often occurs, which not only affects the reliability of the LED lighting system. It also greatly increases maintenance costs.
In recent years, in the communication and Internet industries, in order to ensure uninterrupted power supply, the power supply system usually adopts HVDCN 1 redundancy technology. The scheme is applied to the LED lighting system to ensure reliable power supply of the LED lamps. Since a multi-module parallel centralized power supply scheme is adopted, a power supply device is installed in each tunnel, mine, subway station, etc., to provide a stable DC voltage to all the lamps, Only a constant current circuit is required in each luminaire. The invention solves the problems of complicated circuit, many components, low efficiency and low reliability in the traditional LED driving power source. The power supply unit adopts N 1 multiple power supply modules in parallel. If one power supply module fails, the other N modules can ensure normal power supply. Replace the faulty module without affecting system operation. Since the supplied DC voltage is very stable, the constant current source in each lamp is working at its optimum state, with low power consumption and high reliability.
In some important occasions, such as subway stations, underground shopping malls, airports, tunnels, etc., the system only needs to install a battery pack to complete the uninterrupted lighting function, eliminating the need to install expensive emergency lighting power (EPS). Greatly reduce the cost of the lighting system.
In this DC power supply system, according to the transmission distance, in order to achieve the best LED operation and reduce the line loss, the output DC voltage of the power supply unit is 48V, 110V, 240V and 336V respectively. According to the actual requirements of the user, the above voltage can also be very Wide adjustment.
The LED lighting centralized power supply unit is composed of an AC power distribution device, a rectifier module, a DC power distribution device, and a monitor. The digital rectifier module consists of input EMC, active PFC, DCDC soft-switching high-frequency converter, and output filter circuit. The rectifier module also has functions such as input overvoltage, undervoltage, output overvoltage, current limiting and short circuit protection, and heat sink overheat protection to ensure reliable operation of the lighting power supply unit.
HVDC centralized power supply LED lighting system has the following advantages: First, high reliability: HVDC DC bus is powered by NX redundant, hot swap technology, even if there is a module failure, can ensure uninterrupted power supply, improve The reliability of the system power supply; only DC-DC constant current drive on the luminaire, compared with the traditional drive power supply, the first-level AC-DC is less; the constant current drive on the luminaire has high reliability and long service life. Second, high efficiency: the traditional drive power efficiency is around 90, and the HVDC rectifier module efficiency is greater than 95; HVDC monitoring can achieve the sleep function of the NX redundancy module, which can ensure high efficiency under various load conditions. Third, low cost: high efficiency and high power factor reduce the operating cost of the AC grid; hot backup, high reliability reduces the daily maintenance cost of the equipment; the longer life of the drive power makes the use of the lamp lower.
In short, the biggest advantage of HVDC centralized power supply lighting system is that LED lamps can be made very simple, easy to interchange from the structure, to ensure good maintainability, and at the same time have the advantages of low cost, high reliability and long life.
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General |
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Model |
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CX15/25 |
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Power Type |
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Electric |
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Operate Type |
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Seated |
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Service Weight(Tank empty/full) |
kg |
950/1850 |
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Overall Dimension |
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Dimension |
L×W×T |
mm |
3650×1400×1770 |
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Wheelbase |
mm |
2330 |
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Min Ground Clearance |
mm |
140 |
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Wheel Track Front/Rear |
mm |
1160/1150 |
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Tank Capacity |
L |
900 |
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Application Area:
1.Station
2.Community
3.Park
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