KR101674550B1 - dimming control device of LED lamp using switch on-off signal - Google Patents

Abstract

The present invention relates to a device to control the dimming of an LED lamp by using a switch on/off signal, capable of simplifying circuit configuration and installation by carrying out the installation without an additional wiring work by controlling desired color and brightness of light of an LED lamp with on/off control of a power switch without a separate controller or remote controller for the dimming. The device comprises: a switch attached to a wall and turning on/off a lighting; a rectification unit receiving an AC power through the switch, converting the AC power into a rectified DC voltage, and outputting the rectified DC voltage; an LED lamp receiving the rectified DC voltage via the rectification unit, and emitting light by generating constant current; a power supply unit connected to an output end of the rectification unit to store a voltage, and supplying the voltage to the LED lamp; a counter unit receiving power from the voltage supply unit to store the number of on/off times of the switch; a dimming control unit providing multi-level dimming to the LED lamp according to the number of on/off times of the switch stored in the counter unit; and a ripple removing unit formed between an output end and a ground end of the LED lamp to remove an AC ripple current.

Description

[0001] The present invention relates to a dimming control device for an LED lamp using a switch on / off signal,

The present invention relates to a dimming control apparatus for an LED lamp, and more particularly, to a dimming control apparatus for a dimming control apparatus for an LED lamp, which is capable of multi-step dimming without constructing a separate control line between a switch and an LED lamp and capable of preventing a flickering phenomenon And more particularly to a dimming control apparatus for an LED lamp.

Generally, an LED lamp implemented by a light emitting diode (LED) is driven with less power consumption than a normal lamp. LED lamps can be produced in a variety of ways by controlling the flashing sequence, emission color, brightness (dimming), etc. of the LEDs arranged in a large number.

Such LED lamps are mainly used for general illumination of indoor interior, mood lighting for directing a specific atmosphere, advertisement lighting of shops, and the like.

Generally, an LED lamp includes an LED module that emits light of a certain color, and a control circuit that controls the color, blinking, and brightness (dimming) of light emitted from the LED module.

In addition, the control circuit of the LED lamp includes a power supply unit for converting power supplied from the outside into voltage and current suitable for the LED module and the control circuit. The LED module is formed by mounting a plurality of LED elements on a circuit board (mainly a PCB) in a predetermined arrangement. The LED element may emit light of a single color or may selectively emit various colors according to an external electric / Can be applied.

The control circuit outputs a signal for controlling operations such as a flashing sequence, a light emission color, and a brightness (dimming) for a plurality of LEDs.

For example, Korean Patent Laid-Open No. 10-2011-0052156 discloses an apparatus for controlling the brightness of an LED lamp, which includes PWM control, ambient illumination detection, a PFC circuit, and a lighting delay circuit, Is stably controlled.

However, the above-mentioned prior art detects the illuminance according to the amount of ambient light and detects the ambient illuminance to automatically control the brightness. However, this has a problem that the production cost is large and the user can not control the brightness desired by him.

In addition, recent registered detentions are applied not only to turning on and off but also to freely adjust the brightness to a desired level.

For example, when the user adjusts the brightness of a light by operating a dimming switch (hereinafter referred to as an 'controller') installed on a wall by hand, or by using a wireless remote controller for dimming dimming (hereinafter referred to as a dimming remote controller) In this case, too, there is a problem that production costs are incurred because a separate manipulator or a remote controller for dimming must be provided.

Also, conventionally, in order to control the dimming of the LED lamp, a control lever for dimming control is installed on a switch panel installed on a wall, and a separate control line for transmitting a control signal according to the operation of the control lever to the LED lamp It is difficult to construct by additional wiring work.

[Patent Document 1] Published Japanese Patent Application No. 10-2011-0052156 (Aug. 17, 2011)

[Patent Document 2] Published Unexamined Patent Application No. 10-2013-0012406 (February 06, 2013)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to simplify the circuit configuration by adjusting the color and brightness of the LED illumination light desired by the user by only turning on / off the power switch without using a separate manipulator or remote controller for dimming And an object thereof is to provide a dimming control device for an LED lamp using a switch on / off signal which simplifies construction by proceeding without any separate wiring work.

According to an aspect of the present invention, there is provided an apparatus for controlling dimming of an LED lamp using a switch on / off signal, comprising: a switch mounted on a wall surface to turn on and off an illumination; A rectifier for receiving a DC voltage rectified through the rectifier and generating a constant current to emit light; an inverter connected to the output of the rectifier for storing a voltage and supplying voltage to the LED lamp; A counter unit for receiving and supplying the number of times the switch is turned on and off in response to the power supplied from the voltage supply unit; - a dimming control section for providing level dimming; and - a dimming control section provided between the output terminal and the ground terminal of the LED lamp for eliminating the AC ripple current It characterized in that the configuration including flat portions removed.

The apparatus for controlling dimming of an LED lamp using a switch on / off signal according to an embodiment of the present invention has the following effects.

First, by adjusting the color and brightness of the LED illumination light by user only by ON / OFF operation of the power switch without a separate manipulator or remote control for dimming, it simplifies the circuit configuration and simplifies the construction without additional wiring work. have.

Second, the multi-step dimming can be performed without constructing a separate control line between the switch and the LED lamp, and the on / off signal is momentarily generated in the switch means, so that accurate dimming control can be performed.

Third, a ripple removing device is additionally provided at the output terminal of the LED lamp to effectively remove the AC ripple current, thereby preventing the LED lamp from flickering.

1 is a block diagram schematically showing an apparatus for controlling dimming of an LED lamp using a switch on / off signal according to the present invention.
2 is a circuit diagram more specifically showing an apparatus for controlling dimming of an LED lamp using a switch on / off signal according to the present invention.
3 is a waveform diagram showing an operation state of a dimming control apparatus of an LED lamp using a switch on / off signal according to the present invention.
FIG. 4 is a schematic view of the ripple removing portion of FIG. 1. FIG.
5 is a circuit diagram more specifically showing the ripple removing portion of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 1 is a block diagram schematically showing an apparatus for controlling dimming of an LED lamp using a switch on / off signal according to the present invention, and FIG. 2 is a block diagram of a dimming control apparatus for an LED lamp using a switch on / off signal according to the present invention. And is a detailed circuit diagram.

1 and 2, the apparatus for controlling dimming of an LED lamp according to the present invention includes a switch 10 attached to a wall surface to turn on / off an illumination, A bridge rectifier 30 for receiving an AC power source 20 through a rectifier 30 and converting the rectified DC voltage VDC to a rectified DC voltage VDC and generating a constant current by receiving a rectified DC voltage through the rectifier 30, A voltage supply unit 50 connected to the output terminal of the rectifying unit 30 and storing a voltage and supplying a voltage to the LED lamp 40; A counting unit 60 for counting the number of on and off times of the switch 10 stored in the counter unit 60 and for counting the number of ON / A dimming control unit (70) for providing multi-level dimming to the output terminal of the LED lamp (40) And a ripple removing unit 80 configured to remove the AC ripple current.

The voltage supply unit 50 includes a bias winding 53, a rectification diode 51, a power supply capacitor 52, and a start-up resistor 54.

The voltage supply unit 50 rectifies the AC voltage induced in the transformer while the inductor 71 and the bias winding 53 are provided in the common magnetic core while the switch 10 is turned on, . ≪ / RTI >

The dimming control unit 70 includes an inductor 71 connected to the output terminal of the LED lamp 40 and an anode connected to the inductor 71 and a cathode connected to the LED lamp 40 A MOSFET 73 connected between the anode of the diode 72 and the ground GND and a voltage VDD1 which is an output voltage of the voltage supply unit 50, And a switching controller 75 for controlling the duty cycle of the MOSFET 73 according to the count value of the unit 60 to provide multi-level dimming. In addition to the Buck structure, the dimming control unit 70 may also have a flyback structure and a forward structure.

At this time, the MOSFET 73 may stop the switching operation when the switch 10 is turned off.

When the switching operation of the MOSFET 73 is stopped, the supply of energy from the bias winding 53 to the power source capacitor 52 is stopped. Then, the power source capacitor 52 starts discharging, and the voltage VDD1 is set to a predetermined voltage The RS flip flop 76 connected to the output terminal of the switching controller 75 outputs the EN signal to the output terminal of the switching controller 75. When the reset signal is generated in the switching controller 75, And the counter unit 60 may count the EN signal (Enable signal) of the RS flip-flop 76.

At this time, the counter 60 may store the count value for a predetermined time before the energy of the power supply capacitor 52 is completely discharged.

The switching controller 75 detects the voltage VDD1 to be higher than a predetermined voltage and generates a set trigger signal. The switching controller 75 detects a discharge of the voltage VDD1 below a predetermined voltage and generates a reset trigger signal And an RS flip flop 76 including a UVLO2 stage and receiving the reset trigger signal and outputting an EN signal to the counter 60. [

The switching controller 75 may further include a control logic circuit receiving the EN signal of the RS flip-flop 76 and shutting down the switching controller 75 except for the counter 60. The switching controller 75 may further include a MUX 77 for selecting one of a plurality of voltages preset by referring to the count value of the counter 60 and transmitting the selected voltage to the reference voltage Vref . At this time, when the count value of the counter 60 increases, Vref decreases and the switching duty cycle of the MOSFET 73 decreases.

Also, the MUX 77 may be replaced with a digital-to-analog converter (DAC) that converts the count value to a Vref voltage.

The operation of the dimming control device of the LED lamp using the switch on / off signal according to the present invention, which can be configured as described above, will now be described.

First, in the present invention, as described above, the full-wave rectifier 30 receives the AC power source 20 through the switch 10 and provides a full-wave rectified voltage. The voltage supply unit 50 supplies the VDD1 voltage which is the DC voltage.

The counter 60 is normally 2-bit and uses the VDD1 voltage as a power source, and stores the counted value and supplies it to the switching controller 75 side.

The dimming control unit 70 operates by receiving the voltage VDD1 and generates a current from the rectified DC voltage to drive the LED lamp 40. The dimming control unit 70 corresponds to the value counted by the counter unit 60 The brightness of the LED lamp 40 is adjusted from various levels.

The diode control unit 70 includes an inductor 71, a free-wheeling diode 72, a MOSFET 73, a current sensing resistor 74, and a switching controller 75.

The anode of the diode 72 is connected to the inductor 71 and the cathode of the diode 72 is connected to the rectified DC voltage supply terminal and the LED lamp 40. The inductor 71 is connected to the LED lamp 40, (73) is connected to the anode of the inductor (71) and the diode (72).

The current sensing resistor 74 is connected between the source of the MOSFET 73 and GND. At this time, when the MOSFET 73 is turned on, the voltage applied to the inductor 71 becomes positive, and the current flows while increasing through the LED lamp 40 and the inductor 71, When the voltage of the node increases to reach Vref, the MOSFET 73 is turned off.

Thus, when the MOSFET 73 is turned off, the voltage applied to the inductor 71 becomes negative because the voltage between the LED lamp 40 and the diode 72 is constant. At this time, the current flowing through the LED lamp 40 and the inductor 71 decreases.

Since the MOSFET 73 switches quickly, the current flowing through the LED lamp 40 is kept constant.

The switching controller 75 operates with the voltage VDD1 generated from the voltage supplier 50 and changes the PWM of the MOSFET 73 according to the value provided by the counter 60 to adjust the brightness of the LED lamp 40 .

The start-up resistor 54 supplies a voltage VDD1 that can sufficiently drive the MOSFET 73 at the initial startup.

The inductor 71 and the bias winding 53 are electromagnetically coupled by a transformer using a common magnetic core. When the MOSFET 73 is switched, the inductor 71 is supplied with an AC voltage Which induces an AC voltage proportional to the bias winding 53, and the rectifier diode rectifies the induced AC voltage.

Further, the power source capacitor 52 filters the ripple of the rectified voltage, and as a result, a DC voltage VDD1 is generated. Thus, when the switch 10 is initially turned on, the full-wave rectified voltage VDC charges the power supply capacitor 52 through the start-up resistor 54. [ At this time, when the voltage of VDD1 reaches a predetermined voltage, a set trigger signal is generated in UVLO1, and an EN signal is generated by the RS flip flop 76 of this trigger signal.

The EN signal starts switching by operating the switching controller 75. When the switch 10 temporarily turns off the LED lamp 40, the switching of the MOSFET 73 is stopped. At this time, the bias winding 53 is no longer able to supply power to the power supply capacitor 52. When the voltage VDD1 of the power supply capacitor 52 is discharged to a specific voltage (ex. 6V) or less, the UVLO2 generates a reset trigger signal.

At this time, the counter 60 counts the trigger signal, and the reset trigger signal causes the RS flip-flop 76 to shut down the switching controller 75 excluding the counter 60.

Since the consumption power of the counter unit 60 is very small, the dimming control unit 70 may stop counting the voltage charged in the power source capacitor 52 for about 2 seconds after the dimming control unit 70 stops operating.

Thus, if the user turns off the switch 10 and turns on within about 2 seconds, the dimming level of the LED lamp 40 can be adjusted. If the off state continues for about 2 seconds or more, the count value is canceled and the dimming level of the LED lamp 40 is reset to the initial state. This time is described, for example, and can be changed according to the time constant.

Also, the MUX 77 selects a corresponding dimming voltage among preset voltages and outputs the count value to Vref. At this time, as the count value increases, the dimming voltage decreases.

The switching controller 75 controls the duty cycle of the MOSFET 73 to be proportional to the dimming voltage Vref by the control mechanism of the normal switching controller 75. [ Therefore, when the count value increases, the digression control unit 70 outputs a low output.

Instead of the MUX 77, the same function can be obtained by changing a digital signal such as a DAC to an analog voltage.

3 is a waveform diagram showing an operation state of a dimming control apparatus of an LED lamp using a switch on / off signal of the present invention.

As shown in Fig. 3, when the switch 10 is first turned on, the counter value is initialized to 00 and starts. In this state, the switching controller 75 drives the PWM dimming level at 100%.

Then, on / off of the continuous switch 10 increases the counter value by one. The count value is 01 after the first off-on. At this time, the switching duty cycle of the MOSFET is reduced to 50%. After the second off-on, the count value is 10.

The switching duty cycle at this time is 25%, and the switching duty cycle after the third off-on time is 12.5%. After the fourth off-on, the count value is returned to 00, and the switching duty cycle also returns to 100%.

However, if the switch 10 is turned off for more than a few seconds, VDD1 discharges at a very low voltage and the counter 60 loses the count value. At this time, when the switch 10 is turned on again, the counter 60 is reset to 00, and the switching controller 75 operates at 100% duty cycle.

In the present invention, although the counter 60 is composed of 2 bits, more bits can be used to control the dimming level. The switching controller 75 may be a PWM or a PFM converter, and the dimming controller 70 may be a converter or a forward converter.

FIG. 4 is a schematic view showing the ripple removing portion of FIG. 1, and FIG. 5 is a circuit diagram showing the ripple removing portion of FIG. 4 in more detail.

4, the ripple removing unit 80 includes a ripple sensing unit 140 formed between the LED lamp 40 and the ground to sense the AC ripple current from the output of the LED lamp 40, A clamping unit 150 formed between the LED lamp 40 and the ripple sensing unit 140 for clamping the AC ripple current so that the AC ripple current is removed; An AC ripple current control unit 160 for controlling the clamping unit 150 and an AC ripple removal unit 170 disposed between an output terminal of the LED lamp 40 and the ground to remove the AC ripple current.

The ripple sensing unit 140 includes a resistor connected between the output terminal of the LED lamp 40 and the grounding terminal of the clamping unit 150, And is connected in series with the clamping part 150.

The clamping unit 150 is composed of an FET device between the output of the LED lamp 40 and the ripple sensing unit 140. When the control signal of the AC ripple current control unit 160 is applied to the gate of the clamping unit 150, So that the voltage applied to the external terminal 140 follows the external reference VCC voltage.

The configuration of the AC ripple current controller 160 will be described later in detail based on the circuit diagram of FIG.

The AC ripple removal unit 170 is connected in parallel to the connection between the ripple sensing unit 140 and the clamping unit 150 with respect to the cathode of the LED lamp 40. Therefore, the AC ripple removal unit 170 can increase the time constant of the capacitor to more effectively remove the AC ripple component.

A ripple sensing unit 140 disposed between the LED lamp 40 and the ground to sense AC ripple current from the output of the LED lamp 40 as shown in FIG. A clamping unit 150 for clamping the AC ripple current to remove the AC ripple current and a clamping unit 150 connected between the clamping unit 150 and the ripple sensing unit 140, And an AC ripple removing unit 170 configured to remove the AC ripple current between the output terminal of the LED 130 and the ground.

The AC ripple current controller 160 is connected between the clamping unit 150 and the ripple sensing unit 140 and is actively driven by receiving a reference voltage VCC from a reference voltage source 161, The ripple component can be removed by letting it pass through the filter 165.

The AC ripple current controller 160 clamps the AC ripple current by applying a control signal to the clamping unit 150 so that the voltage of the ripple sensing unit 140 connected to the clamping unit 150 is lower than the voltage of the capacitor filter 150. [ And is connected to follow the voltage applied to the capacitor 165.

The AC ripple current controller 160 includes a reference voltage source 161, first to fourth resistors 162a, 162b, 162c and 162d, first and second switching elements 163a and 163b, Amplifiers 164a and 164b, and a capacitor filter 165. [

The current passing through the LED lamp 40 passes through the first resistor 162a and the second resistor 162b through the clamping part 150 and the current flowing through the first and second operational amplifiers 164a and 164b (-) terminal, respectively.

The control electrode of the first switching device 163a is connected to the output of the second operational amplifier 164b and the control electrode of the second switching device 163b is connected to the output of the first operational amplifier 164a .

Since the first operational amplifier 164a receives the signal of the reference voltage source 161 located at the outside of the first operational amplifier 164a at the (+) terminal and is coupled in the form of a follower thereto, The reference signal is applied to the control electrode of the second switching device 163b and the second switching device 164b is turned on.

The reference voltage of the reference voltage source 161 is always applied to the drain electrode of the first switching device 163a and the reference voltage is applied to the negative terminal of the second operational amplifier 164b. The output voltage of the clamping unit 150 is applied to the (+) terminal of the second operational amplifier 164b while passing through the second resistor 162b.

Therefore, the second operational amplifier 164b outputs a positive output signal (+ VCC) when the output voltage of the clamping unit 150 is larger than the reference voltage, so that the clamping unit 150 is turned on do.

As a result, a direct current component having passed through the LED lamp 40 flows through the clamping unit 150 and the ripple sensing unit 140. In this case, the output voltage of the clamping unit 150 is applied to the capacitor filter 165), thereby reducing power consumption.

In this case, the first switching device 163a coupled to the output of the second operational amplifier 164b is also turned on. Therefore, the direct current applied through the first resistor 162a is connected to the ground through the third resistor 162c and the second switching element 163b, so that the LED 130 can receive the direct current .

A fourth resistor 162d is connected between the third resistor 162c and the drain electrode of the second switching device 163b and the ground. Therefore, even if the second switching device 163b is turned off, the direct current flows through the fourth resistor 162d so that the direct current can always flow stably.

The capacitor filter 165 is connected between the ground and the contact between the source electrode of the second switching device 163b and the third resistor 162c.

The fourth resistor 162d is shorted when the first switching device 163a is turned on and the upper limit value of the AC ripple current is determined by the third resistor 162c.

Further, when the second switching device 163b is turned off, the lower limit value is determined by the third and fourth resistors 162c and 162d so that the AC ripple current can be controlled to be similar to the DC current source. The power consumption can be reduced by reducing the loss of the clamping unit 150 through rapid ripple detection of the ripple sensing unit 140. [

Therefore, by turning on or off the first and second switching devices 163a and 163b using the hysteretic control method, the upper sensing time and the lower sensing time are controlled by the third and fourth resistors 162c and 162d, So that only AC ripple current can be effectively removed.

The ripple removing unit 80 can effectively remove the ripple component by configuring the current passing through the LED lamp 40 to pass through the AC ripple removal unit 170. [ In addition, power consumption can be minimized by configuring the output voltage of the clamping unit 150 connected to the LED lamp 40 to follow the reference voltage.

The capacitor filter 165 removes the ripple component, which is an AC component included in the current. Also, the capacitor filter 165 is coupled to the drain of the first switching device 163a, receives the reference voltage of the reference voltage source 161, and maintains the same voltage.

The AC ripple removal unit 170 is connected to the capacitor filter 165 in parallel, thereby increasing the overall capacitance of the capacitor. Therefore, the ripple removing device of the LED lamp according to the present invention can increase the time constant of the capacitor to more effectively remove the ripple component.

Therefore, in the ripple removing unit 80, the first operational amplifier 164a drives the clamping unit 150 so that the AC ripple current becomes close to the VCC voltage of the reference voltage source 161 that is applied to the first operational amplifier 164a And adjusts the reference point of the capacitor filter 165 to control the upper and lower values of the AC ripple current so as to keep the output voltage of the clamping unit 150 as low as possible to minimize the power consumption of the clamping unit 150 Saturation region.

This operation can produce a spurious close DC LED current while maintaining minimal power dissipation. That is, only the AC ripple from the power source of the LED lamp 40 is effectively removed, thereby preventing the flicker phenomenon in advance.

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 exemplary embodiments or constructions. Can be carried out within a limited range. Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: Switch 20: AC power
30: rectification part 40: LED lamp
50: voltage supply unit 60:
70: dimming control unit 80: ripple removal

Claims (13)

A switch which is attached to the wall surface to turn on / off the illumination,
A rectifier for receiving an AC power through the switch and converting the rectified DC voltage into a rectified DC voltage,
An LED lamp which receives a rectified DC voltage through the rectifying unit and generates a constant current to emit light,
A voltage supplier connected to an output terminal of the rectifying unit for storing a voltage and supplying a voltage to the LED lamp,
A counter unit for receiving and supplying the number of on / off times of the switch supplied with power from the voltage supply unit,
A dimming control unit for providing multi-level dimming to the LED lamp according to a count value of the number of on / off times of a switch stored in the counter unit;
And a ripple removing unit configured to remove the AC ripple current between the output terminal and the ground terminal of the LED lamp,
The ripple removing unit includes a ripple sensing unit configured to sense an AC ripple current generated from the output of the LED lamp and configured between the LED lamp and the ground, and a ripple sensing unit disposed between the LED lamp and the ripple sensing unit, An AC ripple current control unit for controlling the clamping unit to remove the AC ripple current from the clamping unit; and a ripple removing unit for removing the AC ripple current from the output terminal of the LED lamp, , ≪ / RTI >
And a capacitor filter formed in the AC ripple current controller to remove a ripple component from current components flowing in the light emitting diode,
The AC ripple current control unit includes a first operational amplifier having a (+) input terminal connected to a reference voltage source, a negative input terminal connected to an output terminal of the clamping unit to form a follower, A second operational amplifier having an input terminal connected to the capacitor filter and a negative input terminal connected to the capacitor filter, and a second operational amplifier connected in series between the reference voltage source and the ground to receive a control signal of the first and second operational amplifiers, A first resistor connected between a negative input terminal of the first operational amplifier and an output terminal of the clamping unit; and a second resistor connected between the positive input terminal of the second operational amplifier and the output terminal of the clamping unit, A third resistor connected between the third resistor and the second switching element and a ground terminal, and a second resistor connected between the third resistor and the second switching element, Dimming control apparatus of the LED lamp using the switch on / off signal, characterized in that made in a fourth resistance properties. The apparatus of claim 1, wherein the counter stores a count value for a predetermined time before the energy of the power supply capacitor is completely discharged. The power supply unit according to claim 1, wherein the voltage supply unit rectifies the AC voltage induced in the transformer while the inductor and the bias winding are provided in a common magnetic core while the switch is turned on to supply the DC voltage with the ripple removed A dimming control device of an LED lamp using a switch on / off signal. 2. The OLED display as claimed in claim 1, wherein the dimming control unit comprises: an inductor connected to the LED lamp; a diode connected to the anode; a cathode connected to the rectified DC voltage; a diode connected to the LED lamp; And a switching controller which is driven by the output voltage of the voltage supply unit and controls the duty cycle of the MOSFET according to the count value of the counter unit to provide multi-level dimming. An apparatus for dimming control of an LED lamp using a signal. The apparatus of claim 4, wherein the switching operation of the MOSFET is stopped when the switch is turned off. delete delete delete delete The apparatus of claim 1, wherein the first operational amplifier controls the clamping unit so that the voltage applied to the ripple sensing unit follows the reference voltage source. The LED lighting device according to claim 1, wherein the fourth resistor is short-circuited when the first switching device is turned on and the upper limit value of the AC ripple current is determined by the third resistor. The dimming control device of the lamp. 2. The method of claim 1, wherein a lower limit value of the AC ripple current is determined by the third resistor and the fourth resistor when the second switching device is turned off. Control device. The apparatus of claim 1, wherein the AC ripple current control unit controls the reference point of the capacitor filter to maintain the output voltage of the clamping unit at a low level.

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