KR101285644B1 - Current Detection LED Lighting System - Google Patents

Abstract

Current sensing LED lighting device is published. The current sensing LED lighting device of the present invention is connected to a power source, and includes a plurality of LED modules arranged in series with each other, each of the plurality of LED modules is an LED light emitting block consisting of at least one LED element, An LED light emitting block having respective tabs formed between the respective LED modules and at the cathode terminals of the last LED module; And a switching block connected to each tab of the LED light emitting block and driven to form a closed circuit of the LED module to each tab. At this time, the switching block is the next stage that is generated in accordance with the increase of the power supply for the release of the closed circuit of the LED module to the at least one tap to the corresponding at least one tap up to the last stage immediately before the last. It is driven to detect the formation of the closed circuit of the LED module up to the tap of. In the current sensing type LED illuminating device of the present invention, the current path of the switch unit of the stage is still maintained until the current path of the switch unit of the next stage is sufficiently formed. As a result, according to the current sensing type LED lighting apparatus of the present invention, despite the increase in the rectified voltage, the generation of the voltage current mismatched portion in which the current flowing through the LED light emitting block is rapidly reduced is eliminated, and the operation characteristics and reliability are remarkably increased. Is improved.

Description

Current Detection LED Lighting System {Current Detection LED Lighting System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED (LED) lighting apparatus, and more particularly, to an LED lighting apparatus that solves a voltage-current mismatching portion and improves operating characteristics and reliability.

BACKGROUND ART A light emitting diode (LED) element is a kind of compound semiconductor and is an element that emits light by a voltage to be applied. Such LED devices have the advantages of small size, long life, and high efficiency of converting electrical energy into light energy. Accordingly, an LED lighting device using an LED element is gradually being developed as an illumination device replacing an incandescent lamp and a fluorescent lamp.

In addition, in recent years, LED lighting apparatuses emit light in response to the size of an alternating voltage provided from the outside in order to easily improve and increase power efficiency and power factor without using complicated circuit structures and capacitors, inductors, and PFC ICs. A light emitting LED number control type LED lighting device in which the number of LED elements is controlled is being developed.

1 is a view for explaining a conventional LED lighting device, it shows a light emitting LED number controlled LED lighting device. In the existing LED lighting device, the bridge diode 20 rectifies the AC voltage VAC supplied from the AC supply 10 and generates the rectified voltage VREC. The LED elements of the LED light emitting block 30 classified into the plurality of LED modules MD1 to n emit light by the rectified voltage VREC.

In this case, the control signals XCON1 to n generated by the control unit 50 are activated according to the magnitude of the rectified voltage VREC with respect to the ground voltage VSS, so that the switches SW1 to n of the switch unit 40 are activated. Turn on). The number of light emitting LED modules MD1 to n is controlled depending on whether the switches SW formed between the taps TP1 to n and the ground voltage VSS between the LED modules MD1 to n are turned on. .

However, in the LED lighting apparatus of FIG. 1, the current path through the switch SWk of the stage may be released before the current path through the switch SW (k + 1) of the next stage is sufficiently generated. Can be. In this case, as shown in FIG. 2, the sum of the current flowing through the switch SWk of the stage and the current flowing through the subsequent switch SW (k + 1) is drastically reduced.

In other words, in the LED lighting apparatus of FIG. 1, although the rectified voltage VREC is increased, a voltage current mismatching part A is generated in which the current flowing through the LED light emitting block 30 is rapidly decreased. As a result, in the LED lighting apparatus of FIG. 1, an electromagnetic interference phenomenon (EMI) is generated in the voltage current mismatching part A, and thus there is a problem of destroying the LED device.

An object of the present invention is to solve the problems of the existing technology, to provide a LED lighting device to block the voltage and current mismatched portion, improving the operating characteristics and reliability.

One aspect of the present invention for achieving the above technical problem relates to a current sensing type LED lighting device. The current sensing LED lighting device of the present invention is connected to a power source, and includes a plurality of LED modules arranged in series with each other, each of the plurality of LED modules is an LED light emitting block consisting of at least one LED element, An LED light emitting block having respective tabs formed between the respective LED modules and at the cathode terminals of the last LED module; And a switching block connected to each tab of the LED light emitting block and driven to form a closed circuit of the LED module to each tab. At this time, the switching block is to perform the release of the closed circuit of the LED module to at least one of the corresponding tap to detect the formation of the closed circuit of the LED module to the next stage tap generated by the increase of the power power. Driven.

In the current sensing type LED illuminating device of the present invention, the current path of the switch unit of the stage is still maintained until the current path of the switch unit of the next stage is sufficiently formed. As a result, according to the current sensing type LED lighting apparatus of the present invention, despite the increase in the rectified voltage, the generation of the voltage current mismatched portion in which the current flowing through the LED light emitting block is rapidly reduced is eliminated, and the operation characteristics and reliability are remarkably increased. Is improved.

A brief description of each drawing used in the present invention is provided.
1 is a view for explaining a conventional LED lighting device.
FIG. 2 is a view for explaining occurrence of a voltage current mismatched part in the LED lighting apparatus of FIG. 1.
3 is a view showing a current sensing type LED lighting apparatus according to an embodiment of the present invention.
4 is a view illustrating in detail the switch unit of FIG. 3.
FIG. 5 is a diagram specifically showing a normal control unit of FIG. 3.
6 is a view for explaining the effect of the current-sensing type LED lighting apparatus of FIG.

For a better understanding of the present invention and its operational advantages, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which illustrate preferred embodiments of the invention, and the accompanying drawings. In understanding each of the figures, it should be noted that like parts are denoted by the same reference numerals whenever possible. Further, detailed descriptions of known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a current sensing type LED lighting apparatus according to an embodiment of the present invention. Referring to FIG. 3, the current sensing type LED lighting device includes an LED light emitting block 100 and a switching block 200.

The LED light emitting block 100 is connected to a power source VPW which is formed of a voltage difference between the base voltage VSS and the rectified voltage VREC. The rectified voltage VREC and the base voltage VSS are generated from the rectification generation block GPW.

Preferably, the rectification generation block (GPW) comprises an alternating current supply (MSAC) and a rectifier (MRC). The AC supply MSAC supplies an AC voltage VAC. In this case, the AC supplier MSAC may be a self-generator, or may be a device for receiving the AC voltage VAC and receiving it from the outside, such as home electricity.

The rectifier MRC rectifies the AC voltage VAC to provide the rectified voltage VREC. In this case, the base voltage VBAS provided from the rectifier MRC is a voltage higher than the lowest voltage of the AC voltage VAC by the forward turn-on voltage of the diode used for rectification, and is a reference voltage. The base voltage VBAS may substantially correspond to the ground voltage VSS.

The rectified voltage VREC has a voltage difference in one direction corresponding to the voltage of the power power source VPW with respect to the base voltage VBAS. At this time, the voltage of the power source VPW changes over time.

Preferably, the rectifier MRC is a full-wave rectifier for rectifying the entire region of the AC voltage VAC with the voltage in the same direction to provide the rectified voltage VREC.

That is, by the rectifier MRC, a negative voltage at the AC voltage VAC is rectified to a positive voltage of the rectified voltage VREC.

More preferably, the rectifier MRC is a bridge diode.

Referring to FIG. 3, the LED light emitting block 100 includes a plurality of LED modules MD1 to n connected in series with each other, and each of the plurality of LED modules MD1 to n may include at least one. It consists of LED elements. The plurality of LED modules MD1 to n are controlled to emit light by the power power source VPW. At this time, each of the taps TP1 to n is formed between the LED modules MD1 to n and at the cathode terminals of the last LED module MDn.

The switching block 200 is connected to each tap TP1 to n of the LED light emitting block 100 to configure a closed circuit of the LED modules MD1 to n to each tap TP1 to n. Driven.

In addition, the switching block 200 releases the closed circuit of the LED module to the at least one tap corresponding to the at least one tap TP up to the front end just before the last power supply VPW. It is driven to occur by detecting the formation of the closed circuit of the LED module to the tab of the stage after being generated in accordance with the increase of.

For example, the release of the closed circuit to the LED modules MD1 to k up to the kth (where 1 ≦ k ≦ (n−1)) th tap TPk occurs as the power source VPW increases. It is driven to detect the formation of the closed circuit to the LED module (MD1 ~ k) to the next stage tap (TP (k + 1)).

Preferably, the switching block 200 includes a switching unit 210 and a control unit 230.

The switching unit 210 includes a plurality of switch units TSW1 to TSWn. Each of the plurality of switch units TSW1 to TSWn is connected to the taps TP1 to n, and up to the taps TP1 to n corresponding to the switches according to its switching signals XSW1 to n. It is driven to configure a closed circuit of the LED module (TP1 ~ n) of.

For example, when the k-th switch unit TSWk is turned on, the LED modules MD1 to MDk up to the k-th tap TPk form a closed circuit. At this time, the LED modules MD (k + 1) to MDn corresponding to the tap after the (k + 1) th are excluded from the closed circuit.

FIG. 4 is a diagram specifically showing the switch unit of FIG. 3, and a k-th switch unit TSWk is representatively shown. The remaining switch units may also be implemented to have the same configuration and operation as the k-th switch unit TSWk.

Referring to FIG. 4, the switch unit TSWk includes a switching transistor STR, a switching resistor SRS, and a switching comparator SPA.

The switching transistor STR is electrically connected to the tap TPk corresponding to a junction thereof and is gated in response to the gating signal XGTk. Preferably, the switching transistor STR is implemented as an NMOS transistor.

The switching resistor SRS is electrically connected to another one of the switching transistors STR to close the closed circuit of the LED modules MD1 to MD (k-1) to the tap TPk corresponding to the switching resistor SRS. Driven to configure.

The switching comparator SPA generates the gating signal XGTk by comparing the voltage of the feedback signal XFBk generated from another one-junction of the switching transistor STR with the voltage of the switching signal XSWk. do.

Preferably, the switching comparator SPA receives the feedback signal XFBk as an inverting input terminal (−), receives the switching signal XSWk as a non-inverting terminal (+), and the gating signal XGTk. )

In the switch unit TSWk shown in FIG. 4, when the voltage level of the feedback signal XFBk rises above the voltage level of the switching signal XSWk or above a certain level, the voltage of the gating signal XGT. The level goes down. In this case, the switching transistor STR is turned off.

As a result, the closed circuit including only the LED modules MD1 to MDk up to the kth tap TPk is released.

Referring to FIG. 3 again, the controller 230 includes a plurality of control units TCN1 to n corresponding to the plurality of switch units TSW1 to n.

In the present specification, for convenience of description, the control units TCN1 to TCN (n-1) corresponding to the taps TP1 to TP (n-1) up to the last front end are referred to as 'normal control units'. The control unit TCNn corresponding to the last tap TPn may be referred to as a 'last control unit'.

In this case, the normal control units TCN1 to TCN (n-1) form the current paths of the corresponding switch units TSW1 to TSW (n-1), so that the switching signals XSW1 to XSW (n−). 1)), but detects the flow of current of the switch units TSW2 to TSWn in the next stage, and cuts off the current path of the corresponding switch units TSW1 to TSW (n-1).

In this embodiment, the last control unit TCNn generates a predetermined reference voltage VREF, whereby the switching signal XSWn of the last stage is controlled by the reference voltage VREF. The last control unit TCNn may be configured separately or may use the reference voltage VREF generated from another circuit.

In addition, since the control unit TCNn generating the reference voltage VREF can be easily implemented by those skilled in the art, a detailed description thereof will be omitted.

FIG. 5 is a diagram specifically showing the normal control unit TCNk of FIG. 3.

Referring to FIG. 5, the normal control unit TCNk has a control comparator CPA. The control comparator CPA compares the feedback divided voltage VFBk and the switching divided voltage VSWk to generate its own switching signal XSWk.

At this time, the feedback divided voltage VFBk has a voltage level according to the feedback signal XSW (k + 1) of the next stage, and the switching divided voltage VSWk has the switching signal XSW (k + 1) of the next stage. It has a voltage level according to the voltage of)).

Preferably, the control comparator CPA receives the feedback divided voltage VFBk as an inverting input terminal (−), receives the switching divided voltage VSWk as a non-inverting terminal (+), and the own The switching signal XSWk is output.

Accordingly, after the voltage level according to the feedback signal XSW (k + 1) of the next stage rises to a certain level with respect to the voltage level of the switching signal XSW (k + 1) of the next stage, The voltage level of the switching signal XSWk drops and the current path of the corresponding switch unit TSWk is cut off.

That is, even when the switching signal XSW (k + 1) becomes a high voltage level and a current path of the next switch unit TSW (k + 1) starts to be formed, the feedback signal XSW (in the next stage) Before the voltage level according to k + 1)) rises to some extent, the current path of the corresponding switch unit TSWk is maintained to some extent.

5, the normal control unit TCNk preferably further includes a feedback voltage divider MDF and a switching voltage divider MDS.

The feedback voltage divider MDF divides the voltage of the feedback signal XFB (k + 1) of the next stage to generate a feedback divided voltage VFBk. Preferably, the feedback voltage divider MDF includes a first feedback voltage divider resistor FBR1 and a second feedback voltage divider resistor FBR2.

In this case, the first feedback voltage divider resistor FBR1 is formed between the feedback signal XFB (k + 1) of the next stage and the feedback voltage divider voltage VFBk, and the second feedback voltage divider resistor FBR2 is disposed in the second feedback voltage divider resistor FBR2. It is formed between the feedback divided voltage VFBk and its own switching signal XSWk.

In the present embodiment, using the resistance ratio of the first feedback voltage divider resistor FBR1 and the second feedback voltage divider resistor FBR2, the voltage with respect to the voltage of the feedback signal XFB (k + 1) of the next stage is increased. The feedback divided voltage VFBk may be adjusted.

The switching voltage distribution means MDS divides the voltage of the switching signal XSW (k + 1) of the next stage to generate the switching divided voltage VSWk. Preferably, the switching voltage distribution means MDS includes a first switching voltage divider resistor SWR1 and a second switching voltage divider resistor SWR2.

In this case, the first switching voltage divider resistor SWR1 is formed between the next switching signal XSW (k + 1) and the switching voltage divider voltage VSWk, and the second switching voltage divider resistor SWR2 The switching voltage is formed between the divided voltage VSWk and the base voltage VSS.

In the present embodiment, using the resistance ratio of the first switching voltage divider resistor SWR1 and the second switching voltage divider resistor SWR2, the voltage of the switching signal XSW (k + 1) of the next stage is increased. The switching divided voltage VSWk may be adjusted.

In summary, in the current sensing type LED lighting apparatus of the present invention, as shown in FIG. 6, the interruption time point PTC_N of the current path of the switch unit TSWk of the stage is a corresponding stage in the existing LED lighting apparatus. It is delayed compared to the interruption time point PTC_P of the current path of the switch SWk.

As a result, in the current sensing type LED illuminating device of the present invention, the current path of the switch unit TSWk of the stage is still formed before the current path of the next stage of the switch unit TSW (k + 1) is sufficiently formed. maintain.

Accordingly, in the current sensing type LED lighting apparatus of the present invention, even though the rectified voltage VREC is increased, the occurrence of the voltage current mismatched portion in which the current flowing through the LED light emitting block 100 is rapidly reduced is eliminated.

Therefore, according to the current sensing type LED lighting apparatus of the present invention, the operation characteristics and reliability are significantly improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (11)

In an LED lighting device,
A plurality of LED modules connected to a power source and arranged in series with each other, each of the plurality of LED modules being an LED light-emitting block composed of at least one LED element, the cathode between each LED module and the last LED module; An LED light emitting block having respective tabs formed on the terminals; And
A switching block connected to each tab of the LED light emitting block and driven to configure a closed circuit of the LED module to each tab,
The switching block is
And releasing the closed circuit of the LED module to at least one of the corresponding taps by sensing the formation of the closed circuit of the LED module to the next stage tap generated according to the increase of the power source. Current sensing LED lighting device.
The method of claim 1, wherein the switching block
A switching unit including a plurality of switch units, each of the plurality of switch units is connected to the tap corresponding to its own, and according to its own switching signal, the closed circuit of the LED module to the tap corresponding to the self The switching unit driven to configure; And
A control unit comprising a plurality of control units corresponding to the plurality of switch units, wherein the control unit corresponding to the at least one tap to the last front end is configured to form a current path of the corresponding switch unit. And a control unit for generating a signal and controlling the current path of the switch unit to block the current path according to the flow of the current of the switch unit in the next stage.
The method of claim 2, wherein the switching signal of the last stage is
Current sensing type LED lighting device characterized in that it has a reference voltage.
The method of claim 2, wherein each of the plurality of switch units
A switching transistor having a junction electrically connected to the tap corresponding thereto and gated in response to a gating signal;
A switching resistor electrically connected to the other junction of the switching transistor, the switching resistor being driven to form a closed circuit of the LED module to the tap corresponding to the switching transistor; And
A switching comparator for generating the gating signal by comparing a voltage of a feedback signal with a voltage of the switching signal, wherein the feedback signal includes the switching comparator generated from another junction of the switching transistor. Type LED lighting system.
The method of claim 4, wherein the switching transistor
Current sensing type LED lighting device, characterized in that the NMOS transistor.
The apparatus of claim 4, wherein the switching comparator
Receiving the feedback signal through an inverting input terminal (−), receiving the switching signal through a non-inverting terminal (+), and outputting the gating signal.
The method of claim 2, wherein each of the control units
A control comparator that generates a switching signal of its own by comparing a feedback divided voltage with a switching divided voltage, wherein the feedback divided voltage has a voltage level according to the voltage of the feedback signal of a next stage, and the switching divided voltage is a next stage. And a control comparator having a voltage level corresponding to a voltage of the switching signal of the current sensing type LED lighting device.
8. The method of claim 7, wherein the control comparator
The feedback divided voltage is input to the inverting input terminal (-), the switching divided voltage is input to the non-inverting terminal (+), the current sensing type LED lighting apparatus, characterized in that for outputting the own switching signal.
The method of claim 7, wherein each of the control units
Feedback voltage dividing means for dividing a voltage of the feedback signal of a next stage to generate the feedback divided voltage; And
And a switching voltage dividing means for dividing the voltage of the switching signal of the next stage to generate the switching divided voltage.
The method of claim 9, wherein the feedback voltage distribution means
A first feedback voltage divider formed between the feedback signal of the next stage and the feedback divided voltage; And
And a second feedback voltage divider resistor formed between the feedback voltage divider and the switching signal.
The method of claim 9, wherein the switching voltage distribution means
A first switching voltage divider formed between the next switching signal and the switching voltage divider voltage; And
And a second switching voltage divider resistor formed between the switching voltage divider voltage and the base voltage.

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