KR20110051691A - Led lighting device - Google Patents

Abstract

PURPOSE: An LED(Light Emitting Diode) lighting device is provided to maintain uniform light intensity by driving an LED device with uniform current. CONSTITUTION: A second protection unit(322) bypasses a lighting stroke current through a neutral line connected to a second input power unit(312). A current detection unit is formed between a static voltage unit(360) and an LED light source unit(380). The current detection unit detects the driving current flowing on the LED light source unit. A PWM control unit generates a duty ratio for the preset reference current.

Description

Constant current power supply such as LED lighting {LED LIGHTING DEVICE}

The present invention relates to a constant current power supply of an LED lighting lamp using an LED (Light Emitting Diode, hereinafter referred to as "LED"), and more specifically, the constant voltage unit and the LED connected to the rear end of the second protection means of the lamp Driven by a PWM method provided between the light source units The present invention relates to a device for controlling the driving current supplied to the LED light source unit through a constant current driving unit to protect the LED element from overcurrent.

In general, fluorescent lamps applied to lighting luminaires mainly installed in industries such as homes are widely used because they have longer lifespan and lower power consumption than incandescent lamps. However, these fluorescent lamps have a serious problem of environmental pollution. Efforts to reduce carbon dioxide (CO₂) emissions as much as possible in order to prevent this problem are accelerating worldwide.

Accordingly, interest in energy saving is increasing nationwide, and in particular, high brightness LEDs (LED; Light Emitting Diode) The development of various lighting devices using light sources is actively progressing.

However, at present, various LED lighting lamps using LED devices, which are newly developed as part of green energy, do not have a separate device for protecting the LED devices from overcurrent.

For example, when an overcurrent flows to the LED device provided in the LED lamp, the temperature of the junction of the LED device is increased, which causes a change in the voltage level applied to the junction of the LED device.

This causes a problem of causing a change in the current supplied to the LED device and causing a change in the brightness of the LED device. Further, if the temperature of the LED device rises and an overcurrent flows, the lifetime is not only shortened, but also damaged. It causes a lot of problems.

In addition, a plurality of LED elements provided in the LED lighting lamp are connected in series, and since there is a deviation in the forward voltage of each of the LED elements connected in series, if the LED device is not driven with a constant current, This leads to a problem of many differences.

The present invention for solving the conventional problems as described above is a drive current supplied to the LED light source through a constant current driving unit is driven by a PWM method provided between the constant voltage unit and the LED light source connected to the rear end of the second protection means such as a lamp Its purpose is to control the constant, to extend the lifespan by protecting the LED element from overcurrent.

As a means for solving the problems of the present invention as described above, the AC input power terminal (V-in) and the AC input power terminal (V-in) where a commercial AC power source (AC) is input to a luminaire to which a lamp is connected. The first protection means 321 for blocking the lightning current flowing from the first input power source connected to the live line (LT1) side is characterized in that is configured.

In addition, it characterized in that the second protection means connected in parallel to the AC input power supply terminal (V-in) to bypass the lightning current to the neutral line (NT1) connected to the second input power supply.

In addition, the current detection means is provided between the constant voltage portion connected to the rear end of the second protection means and the LED light source portion, and detects the drive current (I2) flowing through the LED light source portion.

In addition, the PWM control unit for generating a duty ratio with respect to the predetermined reference current Is for the drive current (I2) detected through the current detecting means is characterized in that it is configured.

In addition, by receiving the PWM signal output from the PWM control unit on-off switching control of the current flowing from the drain (Drain) to the source (Source), to the LED light source unit 380 through the current adjustment means It is characterized in that it comprises a constant current driver having a switching means for adjusting the size of the driving current (I2) flowing.

Hereinafter, the objects and solutions to the present invention will become more apparent from the detailed description of the various embodiments shown in the accompanying drawings.

As described above, the present invention drives the LED device provided in the LED light source of the LED lamp with a constant current, thereby providing the effect of extending the life with maintaining the uniform brightness for the LED device.

In describing a specific embodiment of the present invention, it is illustrated by the drawings of the present invention, the configuration and operation thereof will be described as at least one embodiment, whereby the technical spirit of the present invention and its core Configurations and operations should not be limited.

For reference, in designating reference numerals in the drawings to be described in the present invention, it should be noted that the same components are given the same reference numerals as much as possible, even if shown in different drawings.

Hereinafter, a constant current power supply of a lighting lamp using an LED element which is a light emitting diode (LED) of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing an example of a state in which a constant current power supply is supplied to a lamp using an LED light source provided in the luminaire according to the present invention, Figure 2 is a view using the LED light source provided in the luminaire according to the present invention One embodiment block diagram showing a circuit configuration for supplying a constant current power source for driving a lamp.

Looking at the schematic configuration means for solving the problems of the present invention, including a lamp 1000, a commercial AC power supply (AC) is supplied through the AC input power terminal (V-in), to the lamp 1000 It includes a lamp 100 provided with an LED light source 380 is electrically connected.

At this time, the luminaire 1000 has a commercial AC power supply (for example, AC 220V) through a live line LT1 and a neutral line NT1 provided at an AC input power terminal V-in. Etc.) is supplied.

The luminaire 1000 as mentioned above generally has an existing luminaire 1000 employing an electronic ballast method or a choke coil type ballast system provided with a ballast stabilizer (not shown). It may be made, including).

In addition, both ends of the luminaire 1000 are configured with a first support 1100 and a second support 1200 for supporting the lamp 100 of the present invention.

In addition, a first holder 1110 and a second holder 1210 for mounting the lamp 100 are respectively formed in the first support part 1100 and the second support part 1200.

The first holder 1110 and the second holder 1210 have a first cap 110 and a second cap 120 at both ends of the lamp 100. First electrode pins 1111 and 1111a to which the first electrode pins 111 and 111a and the second electrode pins 121 and 121a provided are matched and inserted. Second electrode portions 1211 and 1211a are formed.

Commercial AC power supplied to the luminaire 1000 includes first electrode pins 111 and 111a at the first electrode portions 1111 and 1111a and the second electrode portions 1211 and 1211a. ) And the second electrode pins 121 and 121a are electrically connected to each other and are supplied to the lamp 100 through the first input power supply 311 and the second input power supply 312.

In addition, the first holder 1110 and the second holder 1210 generate an elastic force by a separate elastic member such as a spring, such as the first electrode pin (111) (111a) and the first By allowing the two electrode pins 121 and 121a to be supported by the elastic force, it may be desirable to prevent the lamp 100 from being easily removed or damaged from the lamp 1000 due to an impact or the like.

In addition, the luminaire 1000 may be separately grounded (E1) to prevent an electric shock when a human body contacts.

In the present invention, for reference, the live line LT1 may be connected to the first input power supply 311 or the second input power supply 312 during the installation operation of the registration sphere 1000, In addition, the second input power unit 312 or the first input power unit 311 may be connected to the neutral line NT1 by changing, which is to be understood as being irrelevant to the operation of the lamp 100.

Next, the configuration of the lamp 100 connected to the luminaire 1000 according to the present invention will be described in detail.

First, as shown in FIG. 1 and FIG. 2, the lightning strikes through the first input power supply unit 311 connected to the live line LT1 and supplied with commercial AC power. When an overcurrent exceeding a predetermined value due to the inflow of current is generated, a first protective means 321 made of a fuse is formed to block it.

The first protective means 321 is a means for preventing damage to the circuits provided on the rear end of the second protective means 322 in the event of malfunction due to a short circuit of the second protective means 322 or an increase in its own resistance value. It will be preferable to use.

The first protection means 321 and the second protection means 322 are connected in series between the first input power supply 311 and the second input power supply 312.

In addition, the first protection means 321 and the lightning protection for blocking the lightning current flowing from the first input power supply unit 311 connected to the live line (LT1) of the AC input power terminal (V-in) side. Second protection means connected in parallel to the AC input power terminal V-in to bypass the transient current I1 due to the inflow of current to the neutral line NT1 connected to the second input power supply unit 312 ( 322 is configured.

At this time, the second protection means 322 is connected in series between the output terminal of the first protection means 321 and the second input power supply 312, the transient caused by the inflow of lightning current containing a sudden surge (Surge) By rapidly reducing its resistance in response to the increase in voltage, the transient current I1 generated by the lightning current is bypassed through the neutral line NT1 connected to the second input power supply 312. The main is composed of varistors.

The current bypass capacitance value of the second protection means 322 is selected to be at least 1.4 to 2.2 times the commercial AC voltage input to the AC input power terminal V-in to operate at the lightning voltage. It would be desirable to be able to.

In other words, assuming that the commercial AC voltage input to the AC input power terminal V-in is about 220V (volts), the second protection means 322 is in the range of at least 380 to 484V (volts). By setting the operating voltage in the current bypass operation, that is, by bypassing the transient current (I1) generated due to lightning immediately, it is to prevent damage to the circuits provided at the rear end of the second protection means (322) .

For example, the second protection means 322 sets the operating voltage at a commercial AC voltage (AC 220V), for example, about 470V (volts) so that the operation is performed at a higher voltage. It would be desirable to disable it.

On the other hand, the rear end of the second protection means 322 includes filtering of power noise introduced into the first input power supply 311 and the second input power supply 312 in parallel with this, Switching current generated by the rectifier 340 and the power factor correction unit 350 to be described later are connected to the first input power supply 311 and the second input power supply 312 positioned at the AC input power supply terminal V-in. The line filter unit 330 is configured to prevent the return.

In addition, a live line LT1 is connected to the first input power unit 311 of the lamp 100, and a neutral line NT1 is connected to the second input power unit 312 so that commercial AC When the power supply AC is supplied, the LED is converted into a predetermined DC voltage according to the driving characteristics of various circuit elements included in the lamp 100 including the driving of the LED element 381 provided in the LED light source unit 380. The rectifying unit 340 is configured to give a supply.

The rectifier 340 includes a bridge rectifier circuit (hereinafter, referred to as a "rectifier circuit") provided with a plurality of rectifying diodes for rectifying the AC voltage to the DC voltage DC. In addition, the rectifier 340 may be configured to include a separate smoothing circuit for smoothing the AC component remaining in the DC component passed through the rectifier circuit.

In addition, the power factor of the lamp 100 is provided at the rear end of the rectifier 340 by adjusting a pulse width to match the phase of the voltage and current generated inside the lamp 100 in phase. The power factor correction unit 350 is configured to improve power efficiency of the luminaire 1000 by correcting the correction factor.

PWM is provided at the rear end of the power factor correction unit 350 to supply a constant voltage for driving the LED element 381 included in the LED light source unit 380 (also referred to as "lighting" or "light emitting"). (Pulse Width Modulation; this is also referred to as "pulse width modulation") It is characterized in that the constant voltage unit 360 is driven in a manner.

On the other hand, the LED light source unit 380 has at least one high-brightness LED device 381 on a PCB (Printed Circuit Board) (not shown) in series, parallel or series-parallel type, and parallel-matrix type ( Type), including one that is an array (Array).

In this case, the constant voltage unit 360 receives a voltage output from the rectifying unit 340 and generates a constant driving voltage (for example, a driving voltage set in the DC 80 to 450V range) to drive the LED light source unit 380. It would be desirable.

Of course, the driving voltage will vary according to the required number of LED elements 381 arrayed on the PCB, including the form of the array of LED elements 381 on the PCB as mentioned.

In other words, if the normal driving voltage for one of the LED device 381 is a direct current (DC) 3.2V, at this time, assuming that 100 LED elements 381 are arranged in series on the PCB, the overall driving voltage for this Silver DC should be supplied at 320V.

Next, a configuration example of the constant current driver 370 included in the lamp 100 according to the present invention will be described in more detail with reference to FIG. 3.

FIG. 3 is a circuit diagram illustrating in detail a constant current driver for supplying a driving constant current power source to a lamp using an LED light source according to the present invention.

DC voltage (DC) output from the rectifier 340 is provided in the LED light source unit 380 through the constant voltage unit 360 and the constant current driver 370 driven by the PWM method via the power factor correction unit 350. As the driving voltage is supplied to 381, a driving current I2 flows, and the LED element 381 is normally turned on (or referred to as "light emission").

The constant current driver 370 is provided between the rectifier 340 connected to the rear end of the second protection means 322 and the LED light source 380, which includes a PWM control unit 371 made of an integrated circuit (IC), including switching ( Switching means 372, current detecting means 374, current adjusting means 373, and the like.

In addition, the reference voltage Vs is supplied from the constant voltage unit 360 through the first terminal of the PWM controller 371 provided in the constant current driver 370.

In addition, the constant current driver 370 detects the driving current I2 flowing through the LED light source 380 as the current detecting means 374 having a resistance Rs of a predetermined capacitance through the second terminal of the PWM controller 371. The duty ratio of the square wave to the reference current value Is preset or adjusted by the detected driving current I2 is generated through the PWM controller 371 (this is also referred to as "tuning" or "variable"). .)

Here, the current flowing through the current detecting unit 374 is the same as the driving current I2 flowing through the LED light source unit 380, so that the reference is supplied from the constant voltage unit 360 to the first terminal of the PWM control unit 371. The driving current I2 flowing to the LED light source unit 380 may be calculated using the voltage across the resistance Rs of the current detecting unit 374 through the voltage Vs.

For example, this is expressed as a calculation formula such that driving current I2 = reference voltage Vs / resistance Rs.

On the other hand, the PWM signal output from the PWM control unit 371 by the generated duty ratio is supplied to the gate (Gate) of the switching means 381, the source (Source) in the drain (Drain) of the switching means 372 By controlling the current flowing in the on-off switching, the size of the driving current I2 flowing in the LED light source unit 380 through the current adjusting means 373 is adjusted so that the reference current value Is The driving current I2 having a constant magnitude is maintained.

That is, when the duty ratio of the PWM signal output from the PWM control unit 371 increases, the driving current I2 flowing through the LED light source unit 380 increases, and when the duty ratio of the PWM signal decreases, the LED is reversed. The driving current I2 flowing in the light source 380 will be reduced.

In addition, the current adjusting means 373 is a diode (D1) and the inductor (L1) through the drain (Drain) of the switching means 372 in order to prevent the sudden change of the drive current (I2) flowing through the LED light source unit 380 One end of the diode D1 and the other end of the inductor L1 is characterized in that connected to each of the LED light source unit 380 in series.

For example, the anode of the diode D1 is connected to the drain of the switching means 372, the cathode is connected to the output of the constant voltage unit 360, the switching means 372 from the fourth terminal of the PWM control unit 371 When the PWM high signal is supplied to the gate of the gate), the switching means 372 is turned on to drive a predetermined amount of current through the inductor L1 by the voltage output from the constant voltage unit 360. (I2) stably flows to the LED light source unit 380 so that the LED element 381 emits light. At this time, the inductor L1 has current energy corresponding to the driving current I2 flowing through the LED light source unit 380. Will be charged.

In addition, when a PWM low signal is supplied from the fourth terminal of the PWM control unit 371 to the gate of the switching means 372, the switching means 372 is turned off to operate the LED light source unit 380. The inductor L1 and the diode D1 have a closed circuit. At this time, while the current energy charged in the inductor L1 is discharged, a certain amount of driving current I2 flows stably in the LED light source unit 380, whereby the LED element ( 381 becomes a light emitting operation.

Meanwhile, the diode D1, the inductor L1, the switching means 372, and the current detecting means included in the current adjusting means 373 when the constant voltage driver 360 and the constant current driver 370 operate. A noise removing capacitor C1 is connected in parallel to the output terminal of the constant voltage unit 360 as a means for removing noise caused by various external factors included in at least one of a resistor and the like.

In addition, the switching means 372 may include a field effect transistor (FET), a general transistor (transistor), etc., but a MOSFET (Metal Oxide Semiconductor Field) which is advantageous for high-speed switching by a voltage driving method. It would be more desirable to use Effect Transistors.

It will be apparent to those skilled in the art that various changes, modifications, and the like can be made without departing from the technical spirit of the present invention through the above description.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments as mentioned, but should be defined by the claims of the present invention.

1 is a view schematically illustrating a state in which a driving constant current power is supplied to a lamp using an LED light source provided in a luminaire according to the present invention.

FIG. 2 is a block diagram illustrating a circuit configuration for supplying a driving constant current power source to a lamp using an LED light source provided in a luminaire according to the present invention.

3 is a circuit diagram illustrating an example of a constant current driver for supplying a constant current power source for driving a lamp using an LED light source according to the present invention in detail.

Explanation of symbols on the main parts of the drawings

1000: Luminaire

1100: first support

1200: second support

1110: first holder (Holder)

1210: Second holder (Holder)

1111 and 1111a: first electrode part

1211 and 1211a: second electrode portion

100: lighting

110: first cap

120: second cap

111, 111a: first electrode pin

121, 121a: second electrode pin

311: first power input unit

312: second power input unit

321: First protective means

322: second protective means

330: line filter unit

340: rectifier

350: Power factor correction

360: constant voltage portion

370: constant current driver

371: PWM control unit

372: switching means

373: current adjusting means

374: current detection means

380: LED light source

381: LED element

Claims (6)

An AC input power terminal (V-in) through which commercial AC power (AC) is input to the luminaire 1000 to which the lamp 100 is connected; First protection means (321) for blocking lightning current flowing from the first input power source unit (311) connected to the live line (LT1) on the AC input power terminal (V-in) side; Including, Second protection means (322) connected in parallel to the AC input power supply terminal (V-in) to bypass the lightning current to the neutral line (NT1) connected to the second input power supply unit (312); A current detecting means 374 provided between the constant voltage unit 360 connected to the rear end of the second protection means 322 and the LED light source unit 380 and detecting the driving current I2 flowing through the LED light source unit 380. ; A PWM control unit 371 which generates a duty ratio with respect to a preset reference current Is for the driving current I2 detected through the current detecting means 374; On-Off switching control of the current flowing from the drain to the source by receiving the PWM signal output from the PWM control unit 371 to the gate (Gate), the current adjustment means 373 A constant current driver 370 having switching means 381 for controlling the magnitude of the driving current I 2 flowing through the LED light source unit 380 through the controller; Constant current power supply such as LED lighting, characterized in that configured to include. The method of claim 1, wherein the second protection means 322 is connected in series between the first input power supply 311 and the second input power supply 312, the current bypass capacitance value is the AC input power supply terminal (V). at least 1.4 to 2.2 times the input voltage applied via -in); Constant current power supply, such as LED lighting. The driving current (I2) flowing in the LED light source unit 380 increases, and the duty ratio of the PWM signal is small when the duty ratio of the PWM signal output from the PWM control unit 371 increases. Reducing the driving current I2 flowing in the ground LED light source unit 380; Constant current power supply, such as LED lighting. The current adjusting means 373 is connected to one end of the diode D1 and the inductor L1 through a drain of the switching means 372, and the diode D1 and the inductor L1. Another end of) is connected in series with the LED light source unit 380; Constant current power supply, such as LED lighting. The driving current of the LED light source unit 380 through the inductor L1 by the voltage output from the constant voltage unit 360 when the PWM high signal is supplied to the gate of the switching means 372. (I2) flowing; Constant current power supply, such as LED lighting. The method of claim 1, wherein when the PWM low signal is supplied to the gate of the switching means 372, the LED light source unit 380, the inductor (L1), the diode (D1) is a closed circuit, the inductor (L1) A driving current I 2 flows through the LED light source unit 380 while the current energy charged in the discharge is discharged; Constant current power supply, such as LED lighting.

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