KR100861252B1 - Lighting circuit of large numberight-emitting diode using resistor - Google Patents

Abstract

Light emitting diode lighting circuits using a resistor are provided to reduce a maintenance cost, save energy and to light the other light emitting diodes except the light emitting diodes with a trouble. Light emitting diode lighting circuits using a resistor include a power supply unit(10), resistors(R11 to Rn), rectifiers(11 to n), and light emitting diodes(LED21 to LED2n). The power supply unit supplies an AC power or a DC power when a switch is turned on. The resistors are sequentially connected to the power supply unit in series. The rectifiers are coupled to the resistors and output a constant current of a predetermined level. The light emitting diodes are coupled to the rectifiers in series, and emit the light in response to a current flow outputted from the rectifiers.

Description

LIGHTING CIRCUIT OF LARGE NUMBERIGHT-EMITTING DIODE USING RESISTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of light emitting diode lighting circuits using resistors. In particular, in a luminaire device or a signal lamp made by combining a plurality of light emitting diodes (LEDs), any one of the light emitting diodes is troubled and turned on. The present invention relates to a plurality of light emitting diode lighting circuits using a resistor capable of lighting the remaining plurality of light emitting diodes even when they are not.

In general, a luminaire or signal lamp made by combining several light emitting diodes is generally unable to light the remaining light emitting diodes or overcurrent when one of the light emitting diodes fails to light due to defects or other problems. Due to this, there is a problem that the lifespan of the light emitting diode is shortened.

As shown in Figure 1 by combining a series of light-emitting diodes (LED1, LED2, LED3) (LED4, LED5, LED6) constituting a luminaire device or signal lamp made by combining a plurality of light emitting diodes in series and parallel to connect the light emitting diodes In the case of using AC power supply (Vac) or DC power supply (Vdc) in the power supply unit 1, the light emitting diodes (LED1, LED2, LED3) (LED4, LED5) connected by mixing in series and parallel through the current limiting resistor (R1). The current flows evenly in the LED6) line.

By way of example, when one of the light emitting diodes LED1, LED2, and LED3 connected in series is defective, the light emitting diodes of the light emitting diodes LED1, LED2, and LED3 connected in series will be described. Since all are not lit, there is a problem that the lifespan of the light emitting diodes (LED4, LED5, LED6) is shortened as the current flows twice as much as the rated current through the light emitting diodes (LED4, LED5, LED6) connected in series. Cost of replacement because the entire luminaire device or signal lamp should be replaced frequently when any one of the LEDs connected to the LEDs (LED1, LED2, LED, LED4, LED5, LED6) has failed in parallel There were a number of problems such as that it takes a lot.

As shown in FIG. 2, when the light emitting device or the signal lamp made by connecting a plurality of light emitting diodes (LED1A, LED2A, LED3A, LED4A, LED5A) to the power supply unit 2 in series, the light emitting diodes (LED1A, When the AC power supply (Vac) or the DC power supply (Vdc) is applied to the LED2A, LED3A, LED4A, LED5A by the current limiting resistor (R2) in the power supply unit 2, the light is emitted through the current limiting resistor (R2). Current flows through the diodes (LED1A, LED2A, LED3A, LED4A, LED5A).

However, when any one of the light emitting diodes LED1A, LED2A, LED3A, LED4A, LED5A connected in series is defective, all of the light emitting diodes LED1A, LED2A, LED3A, LED4A, LED5A There is a problem that the luminaire device or the entire traffic light must be replaced frequently because it is not turned on.

In addition, as shown in FIG. 3, when the light emitting device or the signal lamp made by connecting a plurality of light emitting diodes (LED1B, LED2B, LED3B, LED4B, LED5B) to the power supply unit 3 in parallel, the light emitting diodes (LED1B, When the AC power source (Vac) or the DC power source (Vdc) is applied to the LEDB, LED3B, LED4B, and LED5B through the current limiting resistor (R3) in the power supply unit 3, the light is emitted through the current limiting resistor (R3). Current flows through the diodes (LED1B, LED2B, LED3B, LED4B, LED5B).

However, when any one of the light emitting diodes LED1B, LED2B, LED3B, LED4B, and LED5B connected in parallel is defective, the current flowing through the remaining light emitting diodes is greater than the rated current, so that the remaining light emitting diodes flow. In addition to the shortening of the service life of the problem, there was also a problem such as frequent replacement of the luminaire device or the entire signal light.

Accordingly, an object of the present invention is to illuminate the remaining plurality of light emitting diodes even when any one of the light emitting diodes fails to turn on in a luminaire device or signal lamp made by combining several light emitting diodes. It is to provide a plurality of light emitting diode lighting circuit using a resistor.

Another object of the present invention is to provide a plurality of light emitting diode lighting circuits using a resistor that can use a luminaire device or a signal lamp semi-permanently made by combining a plurality of light emitting diodes.

Still another object of the present invention is to provide a plurality of light emitting diode lighting circuits using a resistor that can maintain a constant brightness, save energy (power), and reduce maintenance costs.

In order to achieve the above object, a plurality of light emitting diode lighting circuits using the resistance of the present invention include a power supply unit for supplying an AC power source or a DC power source, and a first, second, third ... First, second, third, n-th constant current means connected to the nth resistor and the first, second, third, ..., nth resistors, respectively, to output a constant level of constant current; First, second, third, n-th constant current means connected in series and outputting currents output from the first, second, third, n-th constant current means as they flow; It is characterized by consisting of 2nd, 3rd ... nth light emitting diodes.

According to the plurality of light emitting diode lighting circuits using the resistance according to the present invention, even when any one of the light emitting diodes fails to light in a luminaire device or signal lamp made by combining several light emitting diodes Not only can a large number of light emitting diodes be lit, but also a luminaire or signal lamp made by combining several light emitting diodes can be used semi-permanently, and the brightness of the light emitting diodes can be kept constant and energy (power) can be saved. There are a number of outstanding effects, such as reducing the cost of maintenance.

Hereinafter, a plurality of light emitting diode lighting circuits using a resistor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a circuit diagram schematically showing a plurality of light emitting diode lighting circuits using a resistor according to an embodiment of the present invention.

As shown in FIG. 4, a plurality of light emitting diode lighting circuits using a resistor according to an embodiment of the present invention may include a power supply unit 10 for supplying an AC power source Vac or a DC power source Vdc when the switch SW is turned on. And first, second, third ... n-th resistors R11, R12, R13, ... Rn connected in series with the power supply unit 10, and the first second, third, First, second, third, n-th constant current means (11, 12, 13) connected to n-th resistors (R11, R12, R13, ..., Rn) for outputting a constant level constant current; N) and. The first, second, third, n-th constant current means 11, 12, 13, n are connected in series to the first, second, third, n-th constant current means 11 And first, second, third, and n-th light emitting diodes (LED21, LED22, LED23 ... LED2n) which emit light with the flow of the current output from (12, 13 ... n).

In the above description, n is one or more natural numbers.

Next, the operation and effects of the plurality of light emitting diode lighting circuits using the resistance according to the embodiment of the present invention configured as described above will be described.

First, when the switch SW is turned on, the first, second, third ... nth resistors R11, R12, R13, ... are sequentially connected to the power supply section 10 and the power supply section 10 in series. Since a closed circuit is formed by Rn, the AC power source Vac is connected to the first, second, third, n-th resistors R11, R12, R13, ..., Rn in the power supply unit 10, respectively. Alternatively, an AC current or a DC current flows in the closed circuit as the DC power supply Vdc is applied.
Accordingly, the first, second, third, n-th constant current means 11, at both ends of the first, second, third, n-th resistors R11, R12, R13, ..., Rn. 12, 13, ... n) are connected in series, respectively, so that a constant level constant current output from the first, second, third, n-th constant current means 11, 12, 13, n Is caused to flow through the first, second, third, n-th light emitting diodes (LED21, LED22, LED23, ..., LED2n), whereby the first, second, third, n-th light emitting diodes (LED21, LED22, LED23 ... LED2n) are turned on.
By the way, when a fault occurs in which one of the first, second, third, n-th constant current means 11, 12, 13, n is opened, the fault is connected to an output terminal of the constant current means in which the fault occurs. Since no current flows through the light emitting diode, only the light emitting diode connected to the output terminal of the remaining constant current means is not lit, and the light emitting diode connected to the remaining constant current means is lit.

Further, the first, second, third, n-th light emission, respectively, connected to the output terminals of the first, second, third, n-th constant current means 11, 12, 13, n. Even if a failure (opening trouble) in which any one of the diodes (LED21, LED22, LED23 ... LED2n) occurs, the current does not flow only to the light emitting diode where the open failure has occurred, and the remaining light emitting diodes have a constant level of constant current. Flows and emits light.

A plurality of light emitting diode lighting circuits using a resistor according to an embodiment of the present invention includes the first, second, third, n-th resistors R11, R12, respectively, connected in series to the power supply unit 10, respectively. If a failure is caused in which either of the resistors R13, ... Rn is opened, the power supply unit 10 and the first, second, third, n-th resistors R11, R12, R13, ... Rn Since a closed circuit is constituted by a circuit, current does not flow through the first, second, third, n-th resistors R11, R12, R13, ..., Rn, and the first, second, third, The constant current is not output from the n-th constant current means 11, 12, 13, n, so that the first, second, third, n-th constant current means 11, 12, 13, n The first, second, third, ..., n-th light emitting diodes (LED21, LED22, LED23, ..., LED2n) respectively connected to the output terminals of the LEDs do not light up even if a failure does not occur.
In the above description, since the fuse is installed at the input terminal of the constant current means, when an overvoltage or the like is applied to the constant current means by an external factor, the fuse installed at the input terminal of the constant current means is blown first, so that both ends of the constant current means are short-circuited. And no failure of the light emitting diode means a failure in which both ends of the light emitting diode are opened, and there is no short circuit failure of the light emitting diode, and a failure of the light emitting diode means that the resistance is open. It is a fault, and a fault with a short circuit does not occur.
In addition, in the present invention, since the constant current means outputs a constant current regardless of the size of the input power source, as a constant voltage is applied to the light emitting diode connected to the output terminal of the constant current means, the current flowing through the light emitting diode always flows as well. to be.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

1 is a circuit diagram schematically showing a first example of the related art.

2 is a circuit diagram schematically showing a second example of the related art.

3 is a circuit diagram schematically showing a third example of the related art.

4 is a circuit diagram schematically showing a plurality of light emitting diode lighting circuits using a resistor according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: power supply unit 11: first constant current means

12: second constant current means 13: third constant current means

n: nth constant current means R11: first resistor

R12: second resistor R13: third resistor

Rn: n-th resistance LED 21: first light emitting diode

LED22: Second Light Emitting Diode LED23: Third Light Emitting Diode

LED2n: nth light emitting diode

Claims (1)

The lighting circuit includes a power supply section 10 for supplying an AC power supply Vac or a direct current power supply Vdc when the switch SW is turned on, and first, second, and third devices sequentially connected to the power supply section 10 in series. The n-th resistors R11, R12, R13, ... Rn and the first, second, third ... n-th resistors R11, R12, R13, ... Rn are respectively fixed. First, second, third, n-th constant current means 11, 12, 13, n for outputting a constant current of the level; The first, second, third, n-th constant current means 11, 12, 13, n are connected in series to the first, second, third, n-th constant current means 11 Is composed of first, second, third, n-th light emitting diodes (LED21, LED22, LED23, LED2n) which emit light with the flow of the current output from (12, 13 ... n) A plurality of light emitting diode lighting circuits using resistors.

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