CN201184528Y - Subway LED uninterrupted lighting - Google Patents

Abstract

The utility model discloses an uninterrupted LED lamp used in subway. The uninterrupted LED lamp consists of a switching rectifier, a valve regulated lead acid battery, and an LED light with a constant current controller, wherein, the switching rectifier comprises an AC distribution module, a high frequency switching rectifier module, a monitoring and displaying module, etc.; and the built-in constant current drive circuit of the LED light adopts a reduction voltage type switching circuit. The uninterrupted LED lamp has the advantages of novel structure, low cost, long service life, good power-saving effect, high reliability, easy wide popularization and application, etc.

Description

Subway LED uninterrupted lighting

technical field

The utility model relates to a light-emitting diode (LED) lighting circuit, in particular to a circuit capable of making the LED uninterrupted lighting, which belongs to the semiconductor lighting technology.

Background technique

In recent years, with the rapid development of the national economy, the number of automobiles in our country has increased sharply, and road congestion has become increasingly serious. Major cities are building underground rail transit - subways to alleviate traffic congestion. The underground operation of the subway all the year round has high requirements on the lighting lamps, which not only require power saving, high brightness, and long life, but also must ensure uninterrupted lighting. 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 underground lighting, it is usually necessary to install an emergency lighting power supply, which 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 lighting (LED) powered by DC power supply has been developed rapidly. This kind of lighting can save 90% electricity than incandescent lamps. The life of the lamp can reach 100,000 hours, and the color rendering index can reach more than 80, which is much higher than that of high-pressure sodium lamps. Due to the use of DC constant current power supply, it is impossible for LED lights to flicker, so it has become the best green lighting fixtures recognized by countries all over the world.

Utility model content

The utility model provides a subway lighting system with novel structure, low cost, long service life, good power saving effect and high reliability aiming at the problems existing in the current subway lighting system.

The technical solution of the utility model is: a subway LED uninterrupted lighting lamp, comprising:

Switching rectifiers for converting the alternating current of the grid into direct current;

storage battery for storing electrical energy;

LED array comprising at least one LED;

It is characterized in that: the switch rectifier is composed of an AC power distribution module, a high-frequency switch rectification module, a monitoring and display module, etc., and multiple high-frequency switch rectification modules and monitoring modules are connected in parallel between the AC power distribution module and the display module , the monitoring module is also connected to each high-frequency switch rectifier module, and the output end is connected to the local monitoring and remote monitoring devices; the built-in constant current drive circuit of the LED lamp adopts a step-down switching circuit.

The beneficial effects of the utility model are: it can greatly reduce the initial investment of the uninterrupted lighting system, because the emergency lighting system of the utility model saves the most expensive high-power inverter, and the system cost is reduced by about 40%. Lights can save electricity by 40%, so the capacity of the rectifier and storage battery can be reduced by 40%, so that the cost of the system can also be reduced by 20%, and at the same time, one conversion is reduced, and the system efficiency and reliability are greatly improved. In addition, LED lights can save The AC/DC conversion part is 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. If this part of the circuit is omitted, the reliability of each LED lamp will be greatly improved. , and the lifespan will be greatly extended.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

Fig. 1 is a structural block diagram of the utility model.

Figure 2 is a block diagram of the composition of the switching rectifier.

Figure 3 is a circuit diagram of the LED constant current drive circuit.

Detailed ways

As shown in accompanying drawing 1, it is a structural block diagram of the utility model, which is composed of a switch rectifier, a valve-regulated lead-acid battery, and an LED lamp with a constant current controller. The main function of the rectifier is to convert the alternating current of the grid into direct current in order to charge the battery and power the LED lights. Each subway station is equipped with a high-efficiency switching rectifier. When the battery starts charging, the rectifier outputs a constant current. When the voltage of the battery pack reaches the specified value, the switching rectifier automatically outputs a constant voltage. On the one hand, it supplies the constant voltage of the LED lamp, and on the other hand, it supplies the floating charge current of the battery to ensure that during the working process, The battery is always kept fully charged.

As shown in Figure 2, it is a structural block diagram of a switching rectifier. The switching rectifier is composed of AC power distribution module, high frequency switching rectification module, monitoring and display module and other parts. In order to ensure the reliable operation of the switching rectifier, multiple rectifier modules work in parallel, and an N+1 redundant power supply system is used. During work, even if a module fails, other modules can still guarantee power supply. The monitoring module can monitor various parameters of the switching rectifier, battery pack and LEDs. Through the communication interface, the subway control center can remotely monitor the switch rectifiers, batteries, and LED lights in each subway station.

The main function of the battery is to store electric 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. According to the power and requirements of the LED installed in the subway station, the lighting time after the power failure is guaranteed. to select the required battery capacity. There are many types of batteries, but each subway station requires a relatively large capacity of batteries, so valve-regulated lead-acid batteries with lower prices should be selected. 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.

As shown in Figure 3, the built-in constant current drive circuit of the LED lamp adopts a step-down switching circuit, which has the advantages of wide input voltage range and high control efficiency. In the figure, M ₁ is a switch adjustment tube, D ₁ is a freewheel diode, L ₁ is a freewheel inductor, and R _CS is a current sampling resistor. When the current flowing through the LED lamp changes, the voltage at both ends of the sampling resistor R _CS drops and changes, and the voltage is sent to the current feedback pin I _FB of the integrated circuit IRS2540. After comparing with the internal reference voltage, the control signal changes the switch adjustment tube M ₁ The duty cycle of the output pulse, and through the freewheeling diode, freewheeling inductance _L1 to ensure that the current of the LED lamp is constant. In the figure, the bootstrap diode D _BOOT and the bootstrap capacitor C _BOOT form a high-end bootstrap circuit, which drives the switch adjustment tube to work at high frequency. Diode D _VCC , capacitor C _VCC and diode D _CLAMP form a power supply circuit, which provides power supply voltage to the integrated circuit IRS2540. Diode D _OV , resistors R _OV1 , R _OV2 form an open-circuit protection circuit, and a pulse signal is added through diode D _EN1 to turn off the LED light and adjust the brightness of the LED light.

The LED lamp has a constant current drive circuit. Its function 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 area of the subway station is very large, and the low-voltage direct current transmission technology is adopted. There will be a certain voltage drop on the transmission line, so the voltage added to each LED light will fluctuate to a certain extent, especially after the grid power supply is interrupted, the power supply voltage of the battery will fluctuate even more. Therefore, the constant current control circuit must be used to ensure that the current of all LED lamps remains constant. The LED lamp also needs to be installed with a radiator with a certain area to reduce the operating temperature of the LED lamp and ensure that the life of the LED is more than 50,000 hours. The LED lamp adopts a lampshade made of metal aluminum, so that the lampshade can also realize the heat dissipation function of the LED lamp.

Claims (1)

1, a kind of subway LED continuous illumination lamp comprises:

Switching rectifier is used for the alternating current of electrical network is become direct current;

Battery is used for stored electric energy;

Led array comprises at least one LED;

It is characterized in that: described switching rectifier partly is made up of AC distribution module, high frequency switching rectifier module, monitoring and display module etc., multichannel high frequency switching rectifier module and monitoring module are connected in parallel between AC distribution module and the display module, monitoring module also is connected with each road high frequency switching rectifier module respectively, and its output is connected to local monitor and long-distance monitorng device; The built-in constant-current drive circuit of LED lamp adopts the buck on-off circuit.

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