KR20110009519A - LED lighting driving device - Google Patents

Abstract

The present invention uses a high-brightness LED as a lighting source of the headlight, taillight or streetlight of a bicycle or a vehicle, and by driving the LED blinks at high speed by PWM control, reducing the power consumption and reducing the amount of heat generated to extend the life of the LED. It relates to an LED lamp driving device.

The LED lamp driving apparatus of the present invention comprises a LED driving and charging circuit unit for driving and charging the LED lamp and a control circuit for controlling the LED driving and charging circuit unit in a PWM method so that the LED is flashing.

In the above-described configuration, an LCD indicator may be further provided to display various states including the voltage level or the temperature.

Bicycle, Solar, Cell, Solar Cell, LED, Light, Flashing, PWM

Description

LED lighting driving device {Driving Apparatus for LED Lighting Lamp}

The present invention relates to a driving device for LED lamps, in particular to use a high-brightness LED as a lighting source for the headlights, taillights or streetlights of bicycles or vehicles, LEDs to reduce power consumption by driving the LED blinks at high speed by PWM control It relates to a lamp driving device.

Bicycles are a transport machine that allows people to use their power efficiently enough to say that mankind is the greatest invention ever developed. Mankind has developed more comfortable and faster vehicles, but bicycles have been with human history as the most fundamental means of transportation, and are emerging again as a realistic alternative to catching two rabbits that are emerging these days: health and ecology. have.

Safety is one of the essential factors in the distribution of bicycles.In this sense, the bicycle's lighting system is an important device that can inform the other party about their position in the dark and avoid the sudden situation ahead. It can be said. To date, there have been two types of bicycle lighting systems: self-powered and battery powered. The method of producing electricity by attaching a small generator to the hub and tire of the bicycle has the advantages of being eco-friendly and relatively reducing the user's operation because it does not require replacement of batteries, but it has the disadvantage of consuming part of the driving energy. The lighting system using (battery) has the advantage of securing bright light quantity and high design freedom, but has the disadvantage of requiring user's attention due to frequent battery replacement. To improve this, solar cells are often used as a power source.

Meanwhile, in recent years, high-brightness LEDs have been developed, and these high-brightness LEDs have recently been increasingly used in various lighting sources due to low power, semi-permanent lifespan, and environmentally friendly materials. However, in driving such LEDs at all times, there is a problem in that power consumption increases and heat generation increases, thereby shortening the life of the LEDs.

The present invention has been made to solve the above problems, using a high-brightness LED as an illumination source of the headlights, taillights or streetlights of bicycles or vehicles, and reduces the power consumption by driving the LED blinks at high speed by PWM control and In addition, it is an object of the present invention to provide an LED lamp driving device that can reduce the heat generation to extend the life of the LED.

LED lamp driving apparatus of the present invention for achieving the above object is a control circuit for controlling the LED driving and charging circuit unit for driving and charging the LED lamp and the LED driving and charging circuit unit in a PWM method so that the LED is flashing driven. It is made to include.

In the above-described configuration, an LCD indicator may be further provided to display various states including the voltage level or the temperature.

According to the LED lamp driving apparatus of the present invention, it is possible to extend the life of the LED by reducing the power consumption while reducing the power consumption by blinking at high speed by the PWM power control in driving the LED.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the LED lamp driving apparatus of the present invention, a brief description of the LED prior to the description.

The luminescence that occurs when a voltage is applied to a semiconductor is called electroluminescence (electric field luminescence), and it comes from the observation of luminescence of silicon carbide crystals in 1923. Since the discovery of high luminous efficiency at gallium arsenide p-n junctions in 1923, the research has been actively conducted, and by the end of the 1960s they have been put into practical use.

Suitable materials for light-emitting diodes include the following conditions: ① the emission wavelength must be present in the visible or near-infrared region, ② high emission efficiency, and ③ production of p-n junctions. Gallium arsenide GaAs, gallium phosphide GaP, gallium-arsenide-phosphorus GaAs1-x Px, gallium-aluminum-arsenic Ga1-xAlxAs, indium phosphide InP, indium-gallium-phosphor ln1-xGaxP, etc. Or although a three-element compound semiconductor is used, the research is also progressing about 2B, 6B group, 4A, and 4B group.

The light emitting mechanism is largely divided into (1) by recombination of free carriers and (2) by recombination at an impurity emission center. The emission wavelength at? Is approximately equal to hc / Eg. Where c is the luminous flux, h is Planck's constant, and Eg is the energy width of the band gap. In the case of gallium arsenide, near-infrared light with a wavelength of about 900 nm is emitted. In gallium-arsenic-phosphorus, Eg increases with increasing phosphorus content, making it a visible light emitting diode.

On the other hand, in (2), the emission wavelength differs depending on the kind of impurities added to the semiconductor. In the case of gallium phosphide, light emission involving zinc and oxygen atoms is red (wavelength 700 nm), and light emission involving nitrogen atoms is green (wavelength 550 nm). The light emitting diode is smaller in size than the conventional light source, has a long lifetime, and has low power and good efficiency since electrical energy is directly converted into light energy.

1 is a perspective photograph of a headlamp employing a solar photovoltaic power generation system for bicycles. As shown in FIG. 1, according to the headlight adopting the solar photovoltaic power generation system for bicycles, the cylindrical case 12, the portion of the case 12 that can receive sunlight best, for example It may comprise a solar cell 14 attached to the top surface and one or more illumination LEDs 16 installed behind the protective transparent (or translucent) shade installed on the front of the case 12.

In the above-described configuration, a high brightness LED may be used as the lighting LED 16. On the other hand, inside the case 12, a rechargeable secondary battery and a charging circuit for charging the electric power generated by the solar cell 14 to the secondary battery and the LED are driven at a high speed by a pulse width modulation (PWM) method. Various safety circuits including control circuits are incorporated.

2 is a schematic block diagram of an LED lamp driving apparatus of the present invention. As shown in FIG. 2, the solar photovoltaic power generation lighting system for a bicycle includes a solar cell 110, a rechargeable secondary battery 120, one or more lighting LEDs 130, and power generated by the solar cell 100. And a control circuit 140 for charging the secondary battery 120 and controlling the LED driving and charging circuit unit 110 for driving the lighting LED 130 and the LED driving circuit in a PWM manner.

In the above-described configuration, it is preferable that the LED driving and charging circuit unit 110 has a quick charging function for charging the secondary battery 120 at high speed. The principle is that the ion layer formed when the short current pulse is discharged and charged between the pulses is diffused and decomposed into the electrolyte. This prevents the increase in internal resistance when charging and consequently increases the charging current to enable rapid charging. In addition, by applying the discharge current control technology using the linear operating area of the semiconductor device, and high-density charging and overcharge protection technology, the heat generation (battery temperature) effect by the increase of the charging current is minimized to minimize the life span.

As a result of testing using this technology, the rechargeable battery shows that the charging time is about 2.5 to 3 times that of the existing charging time, and the charging time is reduced by about 30% during the initial charging of the solar battery.

On the other hand, the control circuit 140 uses a PWM method for minimizing the heating problem and the current consumption in driving the LED for lighting, when the LED is blinking more than ten times per second, the human recognizes the flashing state by the afterimage effect Since it is not recognized that the LED light 130 is continuously turned on, no problem occurs in the lighting. In addition, in the case of the flashing driving as described above, the amount of heat generated can be reduced to extend the life of the LED, and furthermore, the brightness is further increased as compared with the case of driving at the same power at all times.

In addition, the control circuit 140 may vary the pulse width of the driving voltage so that the brightness can be adjusted in several stages, for example, four stages. In addition, the control circuit 140 may have a temperature compensation function. In addition, it is desirable to provide a secondary battery safely and long-term by additionally providing a protection circuit and a warning device in order to prevent overdischarge of the voltage sensing terminal and the secondary battery so that the voltage can be checked.

Furthermore, an LCD indicator 150 may be further provided for displaying battery level, voltage, current, temperature or self test information, and short circuit, overload and polarity without using a fuse to protect the control circuit 140. It is desirable to further include a circuit to prevent alteration, overvoltage, high temperature or reverse current at night.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the technical idea of the present invention. For example, in the above-described embodiment, a solar cell is used as the power source, but various DC power sources such as primary batteries (batteries) may be used directly.

1 is a perspective photo of a headlamp employing a solar photovoltaic power generation system for bicycles,

2 is an electrical block diagram of the LED lamp driving apparatus of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: bike lighting system, 12: case,

14: Solesel, 16: LED for lighting,

18: fixture, 100: cell,

110: LED driving and charging circuitry, 120: secondary battery,

130: lighting LED, 140: control circuit,

150: LCD indicator

Claims (2)

LED driving and charging circuit unit for driving and charging the LED lamp and LED lighting device comprising a control circuit for controlling the LED driving and charging circuit portion in a PWM method so that the LED is flashing. The method of claim 1, LED lighting device further comprising an LCD display for displaying a variety of conditions including the voltage level or temperature.

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