KR101052668B1 - The lighting circuit of module led - Google Patents

Abstract

PURPOSE: A lighting circuit of an LED module is provided to maintain lifespan semi-permanently while saving power consumption by removing an electrolytic condenser having a certain lifespan. CONSTITUTION: In a lighting circuit of an LED module, a saw wave generating circuit(80) outputs a sawtooth wave having a certain period in supply power. A comparison voltage generator(61) divides the power of a rectifier circuit through resistor and output a comparison voltage. A second reference voltage generating unit(62) comprises a first constant current circuit(31) and a Zener diode(51). The output terminal of the comparison voltage generator is connected to one side of a modulator(22) and the first comparator(21). The each output terminal of modulator and the first comparator is connected to an AND circuit through combination of two input waveforms.

Description

Lighting circuit of light emitting diode module

The present invention can be integrated (IC) without using heating elements (transformers, electrolytic capacitors), constant brightness is maintained at all times even when the voltage and frequency of the input power source changes, and inrush current and noise do not occur. The present invention relates to a lighting circuit of a light emitting diode module that not only maintains stable lighting but also minimizes its own power consumption due to the elimination of an electrolytic capacitor having a certain life, and also maintains the life semipermanently. More specifically, the light emitting diode module It extends the lifespan by preventing the deterioration of the resistor included in the lighting circuit, and can supply stable voltage to the light emitting diode module even if the input voltage is supplied for more than a moment, and the pulse width even if the input voltage is continuously supplied over 240V. Stable voltage can be supplied through the constant voltage circuit using the modulation method. It relates to a lighting circuit of the LED module for the lock.

In general, the lighting circuit of the light emitting diode module uses a method of switching a direct current into a rectifying circuit as a switching power source and then lighting the light emitting diode through a constant current circuit. However, this method uses a loss of switching power supply and a loss in the constant current circuit. Due to this, the life of the electrolytic capacitor is shorter than that of the light emitting diode due to the drying of the electrolyte due to the continuous charging and discharging of the electrolytic electrolytic capacitor included in the switching power supply. There is a problem that leads to a shortening, and the smoothing electrolytic capacitors included in the switching power supply cause inrush current, which significantly shortens the life of the whole system.

In order to solve the above problems, the present applicant integrates without using a heating element (transformer, electrolytic capacitor) as in Korean Patent No. 949392 (Registration Date: March 17, 2010) shown in FIG. It is possible to maintain constant brightness even when the voltage and frequency of the input power fluctuate.Also, since the inrush current and the noise do not occur, the stable lighting of the light emitting diode is maintained and the removal of the electrolytic capacitor having a certain lifetime In addition to minimizing self-power consumption, we propose a lighting circuit for the LED module that maintains the lifetime permanently.

As described above, in the prior art proposed by the present applicant, when the input voltage is increased, the current flowing in the light emitting diode is increased. When the current flows over a predetermined current by connecting the resistor 70 to the LED module 200 in series, the constant current circuit 30 is applied. The constant current is supplied to the light emitting diode in such a way that the voltage is cut off by the method. When the high input voltage is applied, the internal resistance 70 deteriorates when the temperature rises as shown in FIG. Since the deterioration of the resistor 70 is turned on again as shown in FIG. There is a problem that may occur, the burnout caused by the deterioration of the resistor 70 is a factor that reduces the life of the light emitting diode module.

In addition, the prior art is connected to the resistor 70 to convert the voltage and current of the first reference voltage generator 60 in the form of a voltage in order to implement a circuit of the constant current method, the resistor 70 When the current flowing through is converted into a voltage value and the voltage is higher than the voltage of the first reference voltage generator 60, the comparator 20 operates to cut off the constant current supply unit 30. There is no way to adjust the deterioration of the resistor 70 is inevitable, especially if a short circuit on the output side will cause a rapid burn as shown in Figure 2b.

In addition, in the above prior art, (a) of FIG. 2c is a waveform that appears when no overcurrent is input or there is no problem with a load. Figure 2c (c) is a waveform generated when a voltage of 240V or more is continuously applied, but in the drawing it seems to be switched only about three times, but is actually repeated several times or more, which is a factor of heat generation, resulting in a decrease in life and power consumption. It is a factor.

The present invention extends the life by preventing degradation of the resistance included in the light emitting diode module lighting circuit to solve the problems of the prior art that the applicant has pre-registered as described above, even if the input voltage is supplied with a voltage for more than a moment In addition to supplying a stable voltage to a constant voltage, a constant current diode (CRD) can be used to obtain a stable voltage effect while providing a stable voltage through a constant voltage circuit using a pulse width modulation method even when an input voltage is continuously supplied over 240V. On the other hand, it is possible to integrate (IC) by not using heating elements (transformers, electrolytic capacitors), constant brightness is maintained at all times even when the voltage and frequency of the input power is changed, and light does not occur due to inrush current and noise. Not only stable lighting of the diode is maintained, but also electrolytic with a constant lifetime The present invention relates to a lighting circuit of a light emitting diode module capable of minimizing its own power consumption due to the elimination of a capacitor and of semi-permanently maintaining its life.

According to an embodiment of the present invention, a first reference voltage generator for applying a reference voltage (ref1) to a comparator is connected to one end of a rectifying circuit for converting and outputting AC AC 220V commercial power into a direct current, and an output power of the comparator is turned on to an LED module. In the lighting circuit of the light emitting diode module is connected to the constant current circuit for supplying a resistor, the output terminal of the LED module is connected in parallel with the other terminal of the comparator, the sawtooth wave generating circuit for outputting a sawtooth wave of a certain period when the power supply And a comparison voltage generator for dividing the output power of the rectifier circuit with a resistor and outputting a comparison voltage com, and generating a reference voltage ref2 as the output power of the rectifier circuit, wherein the first constant current circuit and the zener diode are connected in series. Each of the second reference voltage generators connected to each other is provided, and the output terminal of the comparison voltage generator is connected to one end of the first comparator and the modulator. And a comparison voltage is applied, the output terminal of the second reference voltage generator is connected to the other end of the first comparator to apply a reference voltage, and the output terminal of the sawtooth generator is connected to the other end of the modulator to apply a sawtooth wave. Each output terminal of the first comparator and the modulator is connected to an end circuit combining two input waveforms, and the output terminal of the end circuit is connected to a constant current circuit through a transistor and supplies a constant current to one side of the constant current circuit. A constant current diode is connected.

Another embodiment of the present invention is characterized in that two to three constant current diodes in parallel supplying a constant current to one side of the constant current circuit.

According to another embodiment of the present invention, the lighting circuit of the light emitting diode module is integrated to form a one chip.

The present invention can be integrated (IC) without using heating elements (transformers, electrolytic capacitors), constant brightness is maintained at all times even when the voltage and frequency of the input power source changes, and inrush current and noise do not occur. In the lighting circuit of a light emitting diode module which not only maintains stable lighting but also minimizes its own power consumption due to the elimination of an electrolytic capacitor having a certain life, and also maintains life semipermanently, the resistance included in the light emitting diode module lighting circuit Prevents deterioration of the battery and prolongs its lifespan, and provides stable voltage to the LED module even when the input voltage is momentarily supplied. In addition, the constant voltage circuit using the pulse width modulation method even if the input voltage is continuously supplied over 240V. Through the effect that can supply a stable voltage.

1 is a lighting circuit diagram of a conventional light emitting diode module.
2A and 2B are graphs showing deterioration of resistance in a lighting circuit of a conventional light emitting diode module.
2C is an output waveform diagram of each stage in a lighting circuit of a conventional LED module.
3 is a lighting circuit diagram of a light emitting diode module according to the present invention.
4A and 4B are output waveform diagrams of respective stages in the lighting circuit of the light emitting diode module according to the present invention;

Hereinafter, the lighting circuit of the LED module according to the present invention will be described in detail with reference to FIGS. 3 to 4B.

3 is a light emitting diode module lighting circuit diagram according to the present invention, the rectifier circuit 10 for converting and outputting AC (AC) power to DC (DC) is connected to the AC 220V commercial power supply, the rectifier circuit 10 One end of the comparator 20 is connected to an input terminal of one side of the comparator 20 through a first reference voltage generator 60 in which a current limiting resistor 40 and a zener diode 50 are connected in series. In the output terminal, two transistors Q1 and Q2 are connected in series through a resistor 43, and a plurality of light emitting diodes (LEDs) are connected to the output terminal of the constant current circuit 30. It is connected to the LED module 200 connected in series in the package, the other end of the comparator 20 and the resistor 70 is connected in parallel to the output terminal of the LED module 200.

In addition, a sawtooth wave generation circuit 80 for outputting a sawtooth wave of a predetermined period at the time of power supply, two resistors 41 and 42 are connected in series to output a comparison voltage by the divided voltage, and A second reference voltage generator 62 for connecting the first constant current circuit 31 and the zener diode 51 in series to output a reference voltage is provided.

The output terminal of the comparison voltage generator 61 is connected to one end of the first comparator 21 and the modulator 22, and the output terminal of the second reference voltage generator 62 is the other end of the first comparator 21. It is connected to the output terminal of the sawtooth wave generating circuit 80 is connected to the other end of the modulator (22).

Each output terminal of the first comparator 21 and the modulator 22 is connected to an end circuit 23, and an output terminal of the end circuit 23 is connected to the constant current circuit 30 through a transistor Q3. One side of the constant current circuit 30 has a configuration in which a constant current diode 63 for supplying a constant current is connected.

As another embodiment of the present invention, when two or three constant current diodes 63 supplying a constant current to one side of the constant current circuit 30 are connected in parallel, one constant current diode 63 is broken in another constant current diode connected in parallel. Alternate operation to supply a more stable constant current to the LED module 200.

4A and 4B are output waveform diagrams of respective stages in the lighting circuit of the light emitting diode module according to the present invention.

Referring to the operation of the LED module lighting circuit of the present invention made as described above are as follows.

As shown in FIG. 1, the lighting circuit 100 of the LED module according to the present invention configured as described above is converted into DC power as AC 220V commercial power supply passes through the rectifier circuit 10, and the converted DC The power is supplied to the first reference voltage generator 60 in which the current limiting resistor 40 and the zener diode 50 are connected in series to supply the reference voltage ref1 to the non-inverting terminal + of the comparator 20. Will be supplied.

At the same time, the DC power supply via the rectifier circuit 10 is divided by the resistors 41 and 42 of the comparison voltage generating unit 61 so that the voltage of the "c" portion set in FIG. 1 is applied to the non-inverting terminal (+) of the comparator 21 and the modulator 22 as the comparison voltage com, respectively.

The first comparator 21 of the second reference voltage generator 62 and the constant voltage "e" set by the zener diode 51 ((d) of FIG. 4A) are the first comparator 21. The sawtooth waveform (b) of FIG. 4A is applied to the inverting terminal (-) of the comparison voltage com, and is output from the sawtooth wave generating circuit 80, respectively. Applied to each (-).

At this time, since the power is not supplied to the LED module 200 during the initial driving, the comparison power is not applied to the inverting terminal (-) of the comparator 20, and thus the non-inverting terminal (+) of the comparator 20 The DC output power of the rectifier circuit 10 is supplied to the LED module 200 by driving the constant current circuit 30 by the reference voltage (ref1) applied to the plurality of LEDs simultaneously. Lights up.

After that, the DC power supply via the LED module 200 is applied to the inverting terminal (-) of the comparator 20 so that the comparator 20 is set by the current limiting resistor 40 and the zener diode 50. Compared to the voltage (ref1) and the DC power supply via the LED module 200, when the voltage via the LED module 200 is higher than the reference voltage is cut off the constant current circuit 30 is supplied to the LED module 200 When the current is cut off and the normal voltage is maintained, the constant current circuit 30 is driven to supply stable power to the LED module 200 to the module 200 even when a transient voltage is output from the rectifying circuit 10.

On the other hand, the modulator 22 is divided by the resistors 41 and 42 of the comparison voltage generator 61, the comparison voltage (com) waveform (c) of the "c" portion is set and the second Compared with the " e " partial waveform of the reference voltage ref2 of the constant level set by the first constant current circuit 31 and the zener diode 51 of the reference voltage generator 62, (d) of FIG. The waveform lower than the reference voltage ref2 of the second reference voltage generator 62 is cut to output a waveform of the portion “f” (d) of FIG. 4A.

At the same time, the modulator 22 generates a sawtooth wave and a comparison voltage com waveform of the "c" portion set by dividing by the resistors 41 and 42 of the comparison voltage generator 61. By comparing the " b " partial voltage (a) of FIG. 4A output from the circuit 80, a pulse similar to the "d" partial waveform (c) of FIG. 4A is output.

The waveform of the "f" portion output from the first comparator 21 (Fig. 4A) and the "d" partial waveform output from the modulator 22 (Fig. 4A (C)) are the end circuits. 23), a pulse like the "g" portion is output at the portion where the "f" waveform and the "d" waveform overlap as shown in (e) of FIG. 4A, and the output pulse of the AND circuit 23 is The transistor Q3 outputs the pulse having the inverted phase as shown by the waveform of the "h" portion (bar in FIG. 4B).

At this time, when the transistor Q3 is kept off by the pulse of the "h" portion as shown in FIG. 4A (bar) output from the AND circuit 23, the constant current circuit 30 is driven to drive the LED module. The lighting power is supplied to the 200, but the current waveform of the "m" portion via the constant current diode 63 as shown in Fig. 4B and the pulse of the "h" portion as shown in Fig. 4B. Therefore, in the current waveform of the "m" portion higher than the pulse of the "h" portion as shown in (a) of FIG. 4B, the waveform of the "k" portion from which the power supplied to the LED module 200 is cut off is output.

That is, the meaning of the "k" partial waveform, which is the output waveform of the constant current circuit 30 shown in (a) of FIG. 4B, is to cut off the power very momentarily when excessive voltage is supplied to the LED module 200. As a result, since the voltage is lowered, the stable voltage can be supplied to the LED module 200 through the constant voltage circuit using the pulse width modulation method even if the input voltage is continuously supplied with 240V or more.

In particular, in the present invention, integrated circuits (ICs) are possible without using heating elements (transformers, electrolytic capacitors), and constant brightness is maintained at all times even when the voltage and frequency of the input power supply are changed, and inrush current and noise do not occur. Not only the stable lighting of the module is maintained, but also the minimization of its own power consumption due to the elimination of electrolytic capacitors with a certain lifetime, as well as semi-permanent maintenance of life, and integration without using heating elements (transformers, electrolytic capacitors) IC) is possible.

10: rectifier circuit 20: comparator
21: first comparator 22: modulator
23: end circuit 30: constant current circuit
31: first constant current circuit 40 to 43, 70: resistance
50, 51: zener diode 60: first reference voltage generator
61: comparison voltage generator 62: second reference voltage generator
80: sawtooth wave generation circuit 200: LED module

Claims (3)

A first reference voltage generation unit 60 for applying a reference voltage ref1 to the comparator 20 is connected to one end of the rectifier circuit 10 for converting AC AC 220V commercial power into DC and outputting the comparator ( A constant current circuit 30 for supplying lighting power to the LED module 200 is connected to an output terminal of the LED module 200, and a resistor 70 is connected in parallel with the other terminal of the comparator 20 to an output terminal of the LED module 200. In the lighting circuit of the light emitting diode module,
Sawtooth wave generation circuit 80 for outputting a sawtooth wave of a certain period when the power supply,
A comparison voltage generator 61 for dividing the output power of the rectifier circuit 10 by the resistors 41 and 42 and outputting a comparison voltage com;
A second reference voltage generator 62 generating a reference voltage ref2 as an output power source of the rectifier circuit 10 and having a first constant current circuit 31 and a zener diode 51 connected in series;
The output terminal of the comparison voltage generator 61 is connected to one end of the first comparator 21 and the modulator 22 to apply a comparison voltage com,
The output terminal of the second reference voltage generator 62 is connected to the other end of the first comparator 21 to apply a reference voltage ref2,
The output terminal of the sawtooth wave generating circuit 80 is connected to the other end of the modulator 22 to apply a sawtooth wave,
Each output terminal of the first comparator 21 and the modulator 22 is connected to an end circuit 23 which combines and outputs two input waveforms,
The output terminal of the AND circuit 23 is connected to the constant current circuit 30 through the transistor Q3,
Light-emitting diode module lighting circuit, characterized in that the constant current diode 63 for supplying a constant current is connected to one side of the constant current circuit (30). The lighting circuit of a light emitting diode module according to claim 1, wherein two or three constant current diodes (63) for supplying a constant current to one side of said constant current circuit (30) are connected in parallel. 2. The lighting circuit of a light emitting diode module according to claim 1, wherein the lighting circuit of the light emitting diode module is integrated to form a one chip.

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