CN201672429U - LED lighting system with emergency power supply - Google Patents

Abstract

The utility model discloses an LED illuminating system with emergency power supply, which comprises a storage battery that is provided with an input end connected with an alternating-current power supply and an output end connected with an LED illuminating lamp, and a management unit, and is characterized in that the LED illuminating lamp is an alternating-current and direct-current dual-purpose LED illuminating lamp; an alternating-current voltage stabilizer is arranged between the alternating-current and direct-current dual-purpose LED illuminating lamp and the alternating-current power supply; and the storage battery and the management unit are connected with the alternating-current voltage stabilizer by a double-way signal.

Description

LED lighting system with emergency power supply

technical field

The utility model relates to a lighting system with semiconductor light-emitting diode (LED) technology, in particular to an LED lighting system with emergency power supply composed of commercial power and high-voltage direct current according to the requirements for lighting lamps in subways and buildings.

Background technique

Currently commonly used incandescent lamps, fluorescent lamps, high-pressure sodium lamps, etc. are powered by the AC grid. Even an optimally designed AC grid will inevitably suffer blackouts. In order to ensure uninterrupted lighting, it is usually necessary to install an emergency lighting power supply.

A traditional uninterruptible power supply consists of rectifiers, batteries and inverters. When the power grid is normally powered, the AC power is converted into DC power by the rectifier to charge the battery. When the grid power supply is interrupted, the battery converts the DC power into AC power through the inverter to supply power to the lighting fixtures. This kind of uninterrupted lighting system is very costly, and at the same time, due to multiple changes, the power consumption is also relatively large.

In recent years, semiconductor light-emitting diode (LED) lighting powered by DC power supply has been developed rapidly. This kind of LED lighting can save 90% of electricity than incandescent lamps. Under the same power, LED lamps have 40% higher luminous intensity than ordinary fluorescent lamps and high-pressure sodium lamps. Above, and the life of the LED lamp can reach 100,000 hours, and the color rendering index can reach more than 80, which is much higher than that of the high-pressure sodium lamp. Therefore, it has become the best green lighting lamps recognized by countries all over the world. The use of LED lights in subway stations can not only save a lot of electricity bills, but also save a lot of maintenance costs, and at the same time ensure the quality of lighting.

In a subway station, an existing LED lighting system is shown in Figure 1. The system consists of a switching rectifier, a valve-regulated lead-acid battery, and LED lights with a constant current controller. The main function of the rectifier is to convert the alternating current of the grid into direct current, so as to charge the battery and supply power to the LED lights. The main function of the battery is to store electrical energy. When the grid power supply is normal, the rectifier charges the battery. Once the grid power supply is interrupted, the battery can immediately supply power to the LED lights. The function of the LED lamp with a constant current drive circuit is to convert the DC input voltage into the constant current required by the LED lamp to ensure the safe and reliable operation of the LED lamp. The disadvantage of this system is that the efficiency of the switching rectifier is low and the cost is high, which still cannot meet the requirements of high efficiency and energy saving.

Contents of the invention

The utility model provides an LED lighting system with emergency power supply with novel structure, low cost, long service life, good power saving effect and high reliability for the problems existing in the current subway lighting system.

In order to achieve the above object, the utility model is realized by taking the following technical solutions:

An LED lighting system with emergency power supply, comprising a storage battery pack and a management unit whose input end is connected to an AC power supply, and whose output end is connected to an LED lighting lamp. An AC voltage stabilizer is arranged between the AC and DC dual-purpose LED lighting lamps and the AC power supply, and the battery pack and the management unit are connected to the AC voltage stabilizer in bidirectional signals.

In the above solution, the AC voltage stabilizer includes a monitoring module connected to the battery pack and the management unit for bidirectional signals, and an AC power distribution module whose input end is connected to the AC power supply. The output end of the AC power distribution module is connected through two parallel The AC purification stabilized voltage source is connected with AC and DC dual-purpose LED lighting lamps, the monitoring module is connected to the AC power distribution module in two-way signals, and the monitoring module is also connected in bidirectional signals to the output terminals of the two AC purified stabilized voltage sources. The monitoring module can also realize remote monitoring through the communication interface.

The AC and DC dual-purpose LED lighting lamp includes a rectifier bridge, two connection points in the rectifier bridge are connected with the AC voltage stabilizer, battery pack and management unit, and the other two connection points of the rectifier bridge are connected with a valley-filling power factor A correction circuit, multiple LED lamps in series, and a constant current circuit form a closed loop, wherein the positive poles of multiple series LED lamps are connected to the valley-filling power factor correction circuit; the negative poles are connected to the constant current circuit.

Compared with the existing technology, the biggest feature of this utility model is that the initial investment of the uninterrupted lighting system is greatly reduced, because the most expensive high-power inverter is omitted in the new emergency lighting system, and the system cost is reduced by about 40%. , the use of AC and DC dual-purpose LED lights can save 40% of electricity, so the capacity of the rectifier and battery can be reduced by 40%, so that the cost of the system can also be reduced by 20%, and at the same time reduce one conversion, the system efficiency and reliability are greatly improved In addition, AC and DC dual-purpose LED lamps can save the AC/DC conversion part and be directly powered by DC, and the cost of the LED lamp control circuit is greatly reduced. At the same time, the AC/DC conversion has the greatest impact on the reliability of the LED lamp. Part of the circuit, the reliability of each LED lamp will be greatly improved, and the service life will be greatly extended.

Description of drawings

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a structural block diagram of an existing subway station emergency LED lighting system.

Fig. 2 is a system structure diagram of the utility model.

FIG. 3 is a structural block diagram of the AC voltage regulator in FIG. 2 .

Fig. 4 is a schematic diagram of the internal circuit of the AC and DC dual-purpose LED lamp in Fig. 2 of the present invention.

Detailed ways

As shown in Figure 2, the utility model is composed of an AC voltage stabilizer, a storage battery pack, a management unit, and an AC and DC dual-purpose LED lighting lamp. The main function of the AC voltage stabilizer is to change the fluctuating AC power of the power grid into a stable AC power, so as to supply power to the AC and DC dual-purpose LED lights. The main function of the battery pack and the management unit is to store electric energy. When the grid power supply is normal, the battery pack is charged through the management unit, and the management unit outputs a constant current. When the voltage of the battery pack reaches a specified value, the management unit automatically outputs a constant voltage to supply the battery pack. Float charging current ensures that the battery pack is always fully charged. When the battery pack starts to discharge, the management unit outputs a constant voltage to supply power to the AC and DC dual-purpose LED lights. When the battery pack voltage drops to a specified value, the management unit terminates the battery pack discharge. Once the power supply of the power grid is interrupted, the battery pack can immediately supply power to the LED lights, and the capacity of the required battery pack is selected according to the power of the LED installed in the subway station and the requirement to ensure the lighting time after the power outage. There are many kinds of accumulators, and the capacity of accumulators required by each subway station is all relatively large, so the utility model selects the lower valve-regulated lead-acid accumulators of price.

In the uninterrupted lighting system in Figure 2, the AC voltage stabilizer is composed of an AC power distribution module, an AC purification and voltage stabilization source, a monitoring and display module, etc., as shown in Figure 3. In order to ensure the reliable operation of the AC voltage stabilizer, two AC purification stabilized voltage sources are used to work in parallel to form a dual-machine hot backup power supply system. During work, even if one voltage regulator fails, the other voltage regulator can still guarantee power supply. The monitoring module can monitor various parameters of the AC purification stabilized voltage source, battery pack, management unit, and AC and DC dual-purpose LED lights. Through the communication interface of the monitoring module, the subway control center can carry out remote monitoring of the AC purification and voltage stabilization source, battery pack and AC and DC dual-purpose LED lights in each subway station.

The battery pack and management unit in Figure 2, where the management unit is composed of a charging converter and a discharging converter. The management unit monitors the AC input voltage and the capacity of the battery pack, and controls the working status of the charging converter and the discharging converter. The charging converter converts the AC input into a constant output current to charge the battery pack. When the voltage of the battery pack reaches the specified value, the charging converter automatically outputs a constant voltage to supply the floating charging current of the battery pack to ensure that the battery pack is always fully charged. The discharge converter converts the voltage of the battery pack into a constant output voltage, and supplies power to the AC and DC dual-purpose LED lights. When the voltage of the battery pack drops to a specified value, the discharge converter terminates the discharge of the battery pack. In order to ensure uninterrupted lighting, it is best to use two sets of battery packs, one for main use and the other for backup.

A specific embodiment of the AC and DC dual-purpose LED lighting lamp in FIG. 2 is shown in FIG. 4 . It includes a rectifier bridge, a valley-filling power factor correction circuit, a high-precision constant current circuit and 60 LED lamps (LED1-60) connected in series. The rectifier bridge BD1 performs full-wave rectification on the AC input, and rectifies the 220V/50Hz AC into 100Hz steamed bread wave. Diodes D1, D2, D3 and capacitors C1, C2 form a valley-filling power factor correction circuit. Resistors R1, R2, transistor V1, and precision adjustable voltage reference U1 (TL431) form a high-precision constant current circuit. The calculation formula is as follows:

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; ce</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; ref</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; KA</span>}}$

Where: Ice is the constant current; Vref is the reference voltage of TL431.

It can be seen from the above formula that by changing the resistance value of R2, the constant current can be precisely set. When the input voltage is higher than the rated voltage, the constant current circuit limits the current flowing through the LED to prevent the LED from being damaged due to the large current flowing. At the same time, the constant current circuit can effectively suppress the surge current when powering on, which greatly improves the reliability of multiple LEDs used in series. The LED lamp of the utility model is equipped with a heat sink with a certain area, which can significantly reduce the working temperature of the LED lamp and ensure that the life of the LED reaches more than 50,000 hours.

Claims (4)

1. LED illuminator with emergency service, comprise that input connects the batteries and the administrative unit of AC power, output connection LED illuminating lamp, it is characterized in that, described LED illuminating lamp is the dual-purpose LED illuminating lamp of AC and DC, be provided with an AC voltage regulator between dual-purpose LED illuminating lamp of this AC and DC and the AC power, described batteries and administrative unit are connected with this AC voltage regulator two-way signaling.

2. the LED illuminator of band emergency service as claimed in claim 1, it is characterized in that, described AC voltage regulator comprises that a monitoring module that is connected with batteries and administrative unit two-way signaling, an input connect the AC distribution module of AC power, the output of this AC distribution module connects the dual-purpose LED illuminating lamp of AC and DC by the interchange purifying and pressure stabilizing source of two parallel connections, described monitoring module is connected with AC distribution module two-way signaling, and this monitoring module is connected with two outputs that exchange the purifying and pressure stabilizing sources also two-way signaling.

3. the LED illuminator of band emergency service as claimed in claim 2 is characterized in that described monitoring module is realized remote monitoring by communication interface.

4. the LED illuminator of band emergency service as claimed in claim 1, it is characterized in that, the dual-purpose LED illuminating lamp of described AC and DC comprises rectifier bridge, two tie points in this rectifier bridge are connected with batteries and administrative unit with AC voltage regulator, two tie points in addition of rectifier bridge constitute loop with a valley fill type power factor correction circuit, many LED lamps of connecting, a constant-current circuit, wherein, the anodal valley fill type power factor correction circuit that connects of the LED lamp of many series connection; Negative pole connects constant-current circuit.

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