RU2329619C1 - Light-emitting diode illuminator - Google Patents

Abstract

FIELD: lighting.

SUBSTANCE: light-emitting diode illuminator according to its first embodiment comprises a voltage down-converter being connected through a bridge rectifier and a power supply control element with at least one light-emitting diode and a capacitor filter being placed between said bridge rectifier and said light-emitting diode and connected thereto in parallel. Wherein said voltage down-converter includes at least one shunting resistor and at least one capacitor and also at least one current-limiting resistor being connected thereto in parallel. According to the second embodiment a light-emitting diode illuminator is supplemented by a storage battery having a voltage stabiliser connected thereto in parallel and coupled with a light-emitting diode through a power supply control element. According to the third variant a light-emitting diode illuminator is supplemented by a photoelectric transducer having an illumination control element used for controlling a power supply control element.

EFFECT: eliminating voltage jumps, improving the reliability and service life of a light-emitting diode illuminator, reducing power consumption from fixed AC mains and eliminating factors having adverse effects on people.

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Description

LED illuminator refers to devices for lighting rooms, such as, for example, reading rooms, libraries, bookstores, etc.

A device for incorporating a light fixture with LEDs into an alternating current main is known, which contains at least one electric incandescent lamp with a diode bridge, an electronic converter of the mains supply including a rectifying diode bridge, a ballast thermistor and a capacitive filter, and parallel-series LED circuits (see RU 2151473, CL H05B 37/00, published 06/20/2000).

A disadvantage of the known device is the possible high-voltage surges on the rectifier and capacitive filter, which adversely affects the reliability of their work and service life.

The technical result of the proposed invention is the elimination of power surges, improving the reliability and service life of the LED illuminator, reducing power consumption from a stationary AC network and eliminating factors negatively affecting people around, as well as the possibility of using it as an emergency and autonomous lighting device.

According to a first embodiment of the invention, the technical result is achieved by constructing an LED illuminator from a voltage converter based on reactance, which is connected to at least one LED and located between the rectifier diode bridge and the LED through a rectifier diode bridge and an element for controlling the energy supply with them a capacitive filter.

According to a second (emergency) embodiment of the invention, the LED illuminator further comprises a battery connected to the LED via an energy supply control element and designed to accumulate electric energy coming from the AC network through a step-down voltage converter and a rectifier diode bridge. Also, to ensure the normal operation of the battery, a voltage regulator is included in parallel with it in the circuit.

According to a third embodiment of the invention (emergency stand-alone), the LED illuminator further comprises a photoelectric converter coupled to the battery and the LED via an energy supply element for charging the battery in the absence of AC power and an illumination control element for control element to control energy supply.

In addition, in all embodiments of the invention, the voltage converter of the LED illuminator is made of at least one shunt resistor and at least one capacitor, as well as at least one current limiting resistor, in order to reduce the input AC voltage to the level necessary to supply the source light - LED (group of LEDs).

The invention is illustrated by drawings, where figure 1 schematically shows the connection of the elements of the LED illuminator; figure 2 is the same for the second variant of the invention; figure 3 is the same for the third variant of the invention; figure 4 - step-down voltage Converter.

The LED illuminator according to all three options (Figs. 1, 2, 3) contains a transformer-free static step-down voltage converter 1, consisting of at least one capacitor 2 with at least one shunt resistor 3 and at least one current-limiting resistor connected in parallel to it 4 (Fig. 4), made according to the reactance circuit with subsequent rectification of the current and stabilization of its level, connected in series with a step-down voltage converter 1, a rectifier diode Article 5, a capacitive filter 6, parallel mounted in the circuit between the rectifier diode bridge 5 and LED 7 (group of LEDs), designed to smooth out low-frequency ripples of the rectified voltage and eliminate the influence of instability, surges or voltage dips on the operation mode of LED 7. In the LED circuit illuminator after the rectifier bridge 5 introduced element 8 to control the energy supply, which serves to ensure that the LED 7 is turned on and off, and in emergency and emergency-autonomous var and also for regulating the charge and discharge associated with the LED 7 through the element 8 to control the energy supply of the battery 9 (Fig.2, 3), intended for use mainly in emergency situations.

In the process of operation of the LED illuminator (emergency mode), the electric energy coming from the alternating current network is accumulated in the battery 9 and, in the event of a power outage, the product remains operational until the battery is completely discharged 9. To ensure normal operation of the battery battery 9 (excluding recharging) in parallel with it, a voltage stabilizer 10 is included in the circuit (FIGS. 2, 3).

In the emergency-stand-alone embodiment of the LED illuminator in order to charge the battery 9, an alternative energy source is included in the circuit - a photoelectric converter 11 (Fig. 3) connected to the battery 9 and the LED 7 through the power supply control element 8.

In the event of a prolonged shutdown of the mains power supply, the battery 9 receives additional power from the photoelectric converter 11 in the daytime. It is installed mainly outside the room or is located next to the LED illuminator in a place with sufficient lighting.

Also, in the circuit parallel to the photoelectric converter 11, an element 12 for controlling the illumination (Fig. 3) is introduced, connected to the element 8 for controlling the energy supply and serving to control it. With a decrease in illumination (lowering the voltage at the photoelectric converter 11 below a predetermined threshold value), the current flows through the element 12 to control the illumination, which leads to the inclusion of an LED illuminator. When resuming the flow of current through the element 12 to control the illumination - increase the illumination (increase the voltage on the photoelectric converter 11 above a predetermined threshold value), the LED illuminator is automatically turned off. As an element 12 for controlling illumination, for example, a parametric voltage stabilizer introduced into the circuit of the photoelectric converter 11 can serve.

Thanks to such embodiments of the invention, by introducing a step-down voltage converter into the circuit, voltage surges are eliminated, the operation and durability of the LED illuminator are increased (its life corresponds to the LED glow time at the required set current of about 100,000 hours), and power consumption is reduced from a stationary AC network and the elimination of factors negatively affecting people around, as well as the possibility of using it as an independent and independent lighting device.

The voltage supplied to the LED (group of LEDs) is calculated as the difference between the input mains voltage and the voltage drop across the reactance. In this case, the loss of active power on the reactance and, accordingly, its heating are practically equal to zero. Thus, the conversion of the voltage level with high efficiency is achieved. When increasing or decreasing the current flowing through the reactance, the voltage drop across the reactance increases or decreases, while stabilizing the current through the LEDs and, accordingly, stabilizing the brightness of their glow.

It is also possible to use a LED illuminator as an electrically safe emergency illuminator by introducing a battery with a voltage stabilizer and a photoelectric converter with an element for lighting control into the power supply circuit of the LED.

The use of an LED illuminator with the above characteristics can significantly reduce energy costs for lighting, significantly reduce the power and cost of power supply systems and wires and reduce the load on existing electrical systems, thereby reducing the potential for accidents during overloads. Also, due to the absence of ultraviolet and infrared light emitting diodes in the emission spectrum, an LED illuminator is indispensable for illuminating reading rooms, libraries, bookstores and storage facilities of other values, where the presence of ultraviolet and infrared radiation is unacceptable.

Claims (3)

1. An LED illuminator comprising a step-down voltage converter, which is connected to at least one LED via a rectifier diode bridge and an energy supply control element, and a capacitive filter is connected in parallel with the rectifier diode bridge and the LED, and the voltage converter made of parallel connected at least one shunt resistor and at least one capacitor, as well as at least one current-limiting resistor. 2. An LED illuminator comprising a step-down voltage converter, which is connected to at least one LED through a rectifier diode bridge and an element for controlling the energy supply, a capacitive filter located between the rectifier diode bridge and the LED in parallel with them and a feed control element energy with the LED is connected to the battery with a voltage regulator connected in parallel to it, while the step-down voltage converter is made of parallel with union of the at least one shunt resistor and at least one capacitor and at least one current-limiting resistor. 3. An LED illuminator comprising a step-down voltage converter, which is connected through the rectifier diode bridge and the power supply control element to at least one LED located between the rectifier diode bridge and the LED in parallel with them a capacitive filter connected to the LED through the element for power supply control of the battery with a voltage stabilizer connected in parallel to it, and with the battery and LED through the element for controlling A photoelectric converter is connected to the light control element for controlling the power supply control element, wherein the step-down voltage converter is made of at least one shunt resistor and at least one capacitor connected in parallel, as well as at least one current limiting resistor.

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