KR101477158B1 - LED converter with two steps dimming function - Google Patents

LED converter with two steps dimming function Download PDF

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Publication number
KR101477158B1
KR101477158B1 KR20130070336A KR20130070336A KR101477158B1 KR 101477158 B1 KR101477158 B1 KR 101477158B1 KR 20130070336 A KR20130070336 A KR 20130070336A KR 20130070336 A KR20130070336 A KR 20130070336A KR 101477158 B1 KR101477158 B1 KR 101477158B1
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South Korea
Prior art keywords
dimming
led
command signal
unit
current
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KR20130070336A
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Korean (ko)
Inventor
문재호
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주식회사 케이비텍
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0806Structural details of the circuit
    • H05B33/0809Structural details of the circuit in the conversion stage
    • H05B33/0815Structural details of the circuit in the conversion stage with a controlled switching regulator
    • H05B33/0818Structural details of the circuit in the conversion stage with a controlled switching regulator wherein HF AC or pulses are generated in the final stage
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0842Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with control
    • H05B33/0845Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with control of the light intensity

Abstract

The present invention relates to a light emitting diode, that is, an LED converter that supplies a rated power for lighting an LED, and more particularly, to an LED converter that adjusts the brightness of an LED to two levels according to presence or absence of an object such as an underground parking lot, a mart, It has a dimming function that dims the brightness of the LED when the dimming control is performed. It also has a fade function that reduces the impact on the iris and optic nerve of people around the eye by making the brightness of the LED gradually lighter or darker. To an LED dimming converter having a two-stage dimming function for inverting and buffering a dimming command signal input from an existing sensor switch so as to enable dimming control.
An LED dimming converter having a two-stage dimming function according to the present invention includes: a rectifying unit for rectifying input power; A transformer for transforming the pulsating current power outputted from the rectifying section; A direct current (DC) unit for directing the output power of the transformer to the LEDs; A power factor improving PWM unit for controlling the switching of the transformer by a PWM method so as to supply a constant current to the LED and improving a power factor; A dimming control unit for transmitting a dimming control signal for adjusting the illuminance of the LED to the power factor improving PWM unit; And a dimming interface unit for buffering an externally input dimming command signal and transmitting the dimming command signal to the dimming control unit, wherein the dimming interface unit includes a fade unit for buffering the dimming command signal input from the outside while being continuously increased or decreased .

Description

[0001] The present invention relates to an LED dimming converter,

The present invention relates to a light emitting diode, that is, an LED converter that supplies a rated power for lighting an LED, and more particularly, to an LED converter that adjusts the brightness of an LED to two levels according to presence or absence of an object such as an underground parking lot, a mart, It has a dimming function that dims the brightness of the LED when the dimming control is performed. It also has a fade function that reduces the impact on the iris and optic nerve of people around the eye by making the brightness of the LED gradually lighter or darker. To an LED dimming converter having a two-stage dimming function for inverting and buffering a dimming command signal input from an existing sensor switch so as to enable dimming control.

The light source of the lighting apparatus is an incandescent lamp and a fluorescent lamp. Recently, an LED is used.

LED has a variety of advantages such as high illuminance, low power consumption, semi-permanent life span, environment-friendly and emotional lighting, and has recently become a popular light source for lighting fixtures.

Recently, LED lighting has been widely used in homes, offices, factories and underground parking lots.

The converter is a power supply that converts the commercial power to the rated power required for lighting by turning on the LED.

As the energy saving is emphasized, converters with dimming function that can control the brightness of LED light by the ambient illumination or the user's choice, that is, the power consumption of the LED can be adjusted.

Converters with dimming function maximize energy savings by maintaining the minimum brightness for underground parking lots, corridors, toilets, etc., while maintaining maximum brightness when people or objects such as people or cars are identified.

In such an environment where two-stage illumination adjustment is required, the illuminance is maximized when the sensor is sensed in conjunction with the sensor, and the illuminance is kept at the minimum when the sensor is not sensed.

In the prior art, the two-stage roughness adjustment according to the sensor detection is performed by the microcomputer or the resistance contact. However, the method using the microcomputer has a problem of compatibility with the sensor and an increase in the unit price. The operation by the resistance contact increases the length of the contact connection line If the resistive component occurs, the accuracy of the lamp illumination adjustment becomes poor.

When the illuminance becomes bright or darkest from the maximum to the minimum depending on whether or not the sensor is detected, the instantaneous change in the illuminance of the light causes a shock to the visual field of the person, which loses visual field for a short time, The LED converter does not have this function.

Therefore, it is necessary to adjust the illuminance of the LED, but it should be controlled smoothly so that it does not affect human vision

In addition, the dimming converter is turned on when the dimming signal is turned on, when the dimming signal is turned on, and when the dimming signal is turned on, when the dimming signal is turned on. And is reversed.

That is, when the existing sensor switch is directly used as means for inputting an external dimming command signal, the bright illumination and the dark illumination of the LED are illuminated as opposed to the use environment.

Therefore, in order to use the existing sensor switch as the input means of the external dimming command signal, it is necessary to reverse the input external dimming command signal so that the LED is illuminated according to the use environment.

LED converters having a dimming function have been disclosed variously as disclosed in Korean Patent Laid-Open No. 10-2012-0114421 entitled " Dimming Adjusting LED Lighting Device and Method ", Registered Patent No. 1130334 entitled "LED Street Lamp Variable in Brightness According to Ambient Illumination ".

In the LED converter having the dimming function according to the related art, when the dimming command signal is inputted to adjust the brightness of the LED, the brightness of the LED is adjusted immediately.

When the brightness of the LED is instantaneously brightened or darkened, the instantaneous change in the light intensity impairs the iris and optic nerve of the human eye.

Therefore, it is necessary to adjust the illuminance of the LED, but it is required to smoothly control the iris of the human eye and to reduce the impact on the optic nerve of the human eye. However, the conventional LED converter does not have such a function.

A lighting apparatus having a dimming function is generally installed on a porch such as a porch where people often enter and leave, a car park entrance where an object such as a car enters and exits, and a sensor switch for detecting entry and exit of people and automobiles do.

The sensor switch is normally open at normal times and is shorted when an object is detected (ie, the sensor switch is on).

In the case where an external dimming command signal for controlling the brightness of the LED is received from the sensor switch, as shown in the upper drawing of FIG. 5, a strong dimming command signal (i.e., (I.e., a dimming command signal of 1V or less for dimming or turning off the LED) is input when the object is in or out, and the dimming control is reversed.

In other words, when the existing sensor switch is directly used as a means for inputting an external dimming command signal, the bright illumination and the dark illumination (or off) of the LED are illuminated as opposed to the use environment.

Therefore, in order to use the existing sensor switch as the input means of the external dimming command signal, it is necessary to reverse the input external dimming command signal so that the LED is illuminated according to the use environment.

A converter according to the related art having a dimming function is a system in which a PWM unit for controlling the switching of a transformer receives and processes an external dimming command signal. In other words, the PWM unit not only controls the switching of the transformer, but also performs various functions such as feedback of the voltage and current supplied to the LED for controlling the switching, receiving the dimming command signal, and the like.

In general, a converter for LED has a transformer for converting a commercial power source into a rated power source, and a PWM unit for switching a transformer in a PWM manner, and a converter having a power factor improving unit for improving the power factor of a commercial power source while emphasizing energy efficiency .

1 is a circuit diagram of a conventional constant current type power supply device for a high-brightness LED lighting device, which is a converter (i.e., a power supply device) according to the prior art of FIG. 1, However,

A power factor improving unit (PFC) 30 for improving the power factor of the input power source so that the voltage and the current are in phase with each other, a smoothing unit 30 for smoothing the power factor- And the PWM units 40 and 60 convert the transformer T2 into a rated power by switching the transformers T2 and C3 in the PWM manner.

The power factor improving unit 30 (PFC) and the PWM units 40 and 60 are independently driven to have unique IC chips U1 and U2 to improve the power factor and make the rated power.

That is, in the prior art, the power factor improving unit 30 (PFC) and the PWM units 40 and 60 are separately provided, and the smoother DC power is supplied to the transformer T2 at the output side of the power factor improving unit 30 Smoothing portions C3, C7, R1, R4, R5, and R12 are provided.

In the current trend of reducing energy consumption, that is, reducing unnecessary power loss and increasing efficiency, while the energy resources are gradually getting depleted, the converter according to the related art has a power factor improving unit 30 (PFC) and a PWM unit 40 60 and the smoothing units C3, C7, R1, R4, R5, and R12 on the output side of the power factor improving unit, the sum of the power consumed by each of them is not negligible.

The converter has a feedback unit for sensing the voltage supplied to the LED and / or the voltage to continuously supply the rated power to the LED, that is, the constant voltage and / or the constant current, and transmitting the PWM to the PWM unit for controlling the switching of the transformer. It is necessary to have its own driving power to compare the voltage or / and voltage to the reference voltage and / or current and to transmit the comparison result to the PWM section,

In the prior art, the driving power of the feedback unit is converted into a direct current power of the transformer and an output power of the direct current unit which supplies the output power of the transformer to the LED is converted into a driving power of a constant voltage by the regulator.

The power loss is unexpectedly large when the output power of the direct current part is converted and used as the driving power of the feedback part as in the prior art and the driving power of the feedback part is difficult to be maintained when a short circuit occurs in the LED load. There is a danger that the feedback can not be made, and the converter is damaged due to failure to feed the overcurrent due to the short circuit.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional LED converters,

The voltage and current sensed by the voltage sensing unit and the current sensing unit of the dimming control unit are compared with the external dimming command signal to adjust the maximum and minimum illuminance in two stages,

And an inverting function of inverting an external dimming command signal so that a sensor switch installed in an existing underground parking lot, a hallway, a toilet, etc. can be used as input means of an external dimming command signal without structural modification,

When the external dimming command signal is inputted to adjust the illuminance of the LED at maximum and minimum, the dimming command signal inputted thereto is gradually increased or decreased continuously so that the brightness of the LED is instantaneously lighter or darker The present invention provides an LED dimming converter having a two-stage dimming function that does not affect a person's viewpoint, and does not cause a gentle lightening or darkening so as not to affect a person's sight.

In addition, the power factor improving PWM unit which improves the power factor and also converts to the rated power source is introduced and the smoothing unit for switching the PWM method of the transformer is not required, thereby maximizing the energy efficiency by minimizing the power consumption of the converter. Another object of the present invention is to provide an LED dimming converter having a two-stage dimming function which is provided with a dimming function so that the brightness of the LED can be adjusted.

The dimming control signal for adjusting the brightness of the LED is not input to the PWM section separately from the voltage and current feedback signals supplied to the LED but is also applied to the dimming command signal which is inputted from the outside and the feedback signal of voltage and current, The control signal, that is, the dimming control signal that adjusts the brightness of the LED, transmits the dimming control signal, which is the sum of the voltage and current feedback signals supplied to the LED, to the PWM unit, which reduces the load on the PWM unit and prevents malfunction and damage. Another object of the present invention is to provide an LED dimming converter having a single dimming function,

The driving power for driving the dimming control unit, the dimming interface unit, and the feedback unit can be stabilized even when dimming the brightness of the LED to 5% or less by using the voltage induced in the auxiliary winding separately connected to the secondary side of the transformer To prevent the LED light from flickering due to the unstable feedback operation and to keep the driving power for a short time even when the LED load is shorted so that the converter can be safely protected by detecting the overcurrent due to short- The present invention also provides an LED dimming converter having a two-stage dimming function.

According to an aspect of the present invention, there is provided an LED dimming converter having a two-stage dimming function,

A rectifying section for rectifying input power;

A transformer for transforming the pulsating current power outputted from the rectifying section;

A direct current (DC) unit for directing the output power of the transformer to the LEDs;

A power factor improving PWM unit for controlling the switching of the transformer by a PWM method so as to supply a constant current to the LED and improving a power factor;

A dimming control unit for transmitting a dimming control signal for adjusting the illuminance of the LED to the power factor improving PWM unit;

And a dimming interface unit for buffering an externally input dimming command signal and transmitting the buffered dimming command signal to the dimming control unit,

The dimming interface unit includes a fading unit for buffering the dimming command signal input from the outside while continuously increasing or decreasing the dimming command signal.

The dimming interface unit includes a buffer U201-A for buffering an externally input dimming command signal and a resistor R201 for transmitting a dimming command signal buffered in the buffer U201-A to the dimming control unit ,

The dimming control unit receives a current according to a dimming command signal output from the resistor R201 and a current output from a resistor R31 for sensing an output current of the DC unit to generate a dimming control signal, R31 attenuates the output current of the direct current portion and the dimming control signal generated by the dimming control portion is determined by the current output by the resistor R201,

The dimming interface unit includes a resistor R208 connected to a non-inverting terminal of the buffer U201-A to provide a reference voltage, and a resistor R208 connected to a non-inverting terminal of the buffer U201- Gt; R209 < / RTI >

The fade section is connected in series to the resistor R209,

When the dimming command signal input from the outside is a high signal in the off state, the dimming command signal of the inverted low signal for the lowest illuminance is turned on to be inputted to the buffer U201-A,

And a transistor Q201 that is turned off when a dimming command signal input from the outside is a low signal and the dimming command signal of the inverted high signal for the maximum illumination is inputted to the buffer U201-A .

The fade section

A capacitor C203 connected to the gate terminal of the transistor Q201 and charged / discharged by a dimming command signal input from the outside to fade the dimming command signal,

And a resistor R213 connected in series to the capacitor C203 to reduce a turn-on delay time of the transistor Q201.

The LED dimming converter having the two-stage dimming function according to the present invention having the above-described structure is configured such that when the external dimming command signal for changing the brightness of the LED is input, the brightness of the LED is not changed instantaneously, In other words, by reducing the impact of the iris and the optic nerve of the eye caused by the change of the illumination,

The conventional sensor switch can be used as a means for inputting the external dimming command signal by buffering the inputted external dimming command signal by reversing it,

In addition, the power factor improving unit for improving the energy efficiency and the PWM unit for controlling the switching of the transformer for the rated power source are separately provided and not driven separately. The power factor improving PWM unit improves the power factor and also makes the rated power And the power consumption consumed by the entire converter is minimized, thereby maximizing the energy efficiency. Further, by adjusting the brightness of the LED according to the surrounding conditions, it is possible to reduce the energy consumption and produce the lighting atmosphere The dimming control signal for adjusting the brightness of the LED, ie, the dimming control, is synthesized with the feedback signal of the voltage and current for the rated power and is transmitted to the PWM unit to prevent malfunction and damage And the driving power of the dimming control section, the dimming interposer section, and the feedback section are separately supplied to the secondary side of the transformer The power supply is supplied from the auxiliary winding to reduce the power loss, and even when dimming is performed at low light, the driving power is supplied stably to prevent the light from being shaken. Even when the LED load is short, the driving power is maintained for a while, This is an LED dimming converter with a two-step dimming function that can safely protect the converter by immediately feedbacking it. This is an extremely useful invention for industrial development.

1 is a circuit diagram of a conventional LED converter;
2 is a schematic configuration diagram of an LED dimming converter having a two-stage dimming function according to the present invention.
3 is a specific circuit diagram of an LED dimming converter having an L2 step dimming function according to the present invention.
4 is a diagram for explaining a power factor improving method;
FIG. 5 is a diagram showing the relation between the dimming command signal and the illuminance (supply current) of the LED according to the prior art in which the inversion function and the fade function are absent.

Hereinafter, an LED dimming converter having a two-stage dimming function according to the present invention will be described in more detail with reference to the drawings.

Before describing the converter according to the present invention in more detail,

While the present invention has been described in connection with certain embodiments, it is obvious 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 invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

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 term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In the following description of the present invention, it is to be noted that the reference numerals added to the respective components are not related to the reference numerals used in the prior art shown in FIG.

2 and 3, the present invention includes an EMI filter 10, a rectifying unit 20, a power factor improving PWM unit 30, a transformer T1, a DC unit 40, a feedback unit 50, A supply unit 60, a dimming control unit 70, a dimming interface unit 80, and the like.

3A, the input side to which the commercial power is input includes a fuse F1 for blocking the overcurrent when the overcurrent is inputted to the commercial power supply to protect the converter, and a fuse F1 for clamping the instantaneous overvoltage when the surge voltage is input, And a varistor (MOV1) for protecting the converter is connected.

The EMI filter 10 is connected to the output side of the fuse F1 and the varistor MOV1 to remove a conductive noise included in a commercial power source.

The EMI filter 10 includes two line filters LF1 and LF2 on both sides and capacitors C3 and C10 provided on output sides of the two line filters LF1 and LF2 and two line filters LF1 and LF2, And the intermediate point between the two capacitors C1 and C2 connected in series is grounded to flow the conductive noise included in the commercial power supply to the ground.

The rectifier 20 performs full-wave rectification of the commercial power output from the EMI filter 10 and converts it into a pulsed power supply.

The rectifying unit 20 includes bridge diodes D1 to D4.

The transformer (T1) transforms the pulsating current output from the rectifying unit (20) and outputs a rated power having improved power factor.

The power factor improving PWM unit 30 improves the power factor and controls the switching of the transformer T1 so as to output the rated power.

The power factor improving section PWM section 30

A switching device (Q1) for turning on and off the transformer (T1)

A control unit U1 for controlling the switching of the switching device Q1,

Start resistors R2 and R24 and a capacitor C9 for providing a start voltage for initial operation of the control unit U1,

R2, R3, and C6 that sense the voltage waveform of the output pulsating current of the rectifying unit 20 and provide the detected voltage waveform to the control unit U1,

An auxiliary coil t1 wound on the primary side of the transformer T1 and magnetically coupled thereto,

R28, Q3, C14, C12, R21, and ZD1 that convert the voltage induced in the auxiliary coil t1 to a constant voltage and convert the voltage into a driving power and supply the voltage to the control unit U1,

 A current sensing unit R13 for sensing a current induced by the switching of the transformer T1 from the auxiliary coil t1 and sensing a zero point where the current intensity is zero and providing the zero point to the control unit U1;

Snares (D9, R12, C11) for limiting and protecting the intensity of counter electromotive force induced on the primary side of the transformer (T1)

(R5, 7, 8, 9, 10, 11, 14, C8, etc.) connected to drive the control unit (U1).

The control unit U1 controls the switching of the switching device Q1 so that the waveform of the current induced in the transformer T1 matches the waveform of the voltage output from the rectifier 20, And the current is in phase to improve the power factor.

More specifically, the control unit U1 controls the voltage of the output pulsating current source of the rectifier unit 20 sensed by the voltage sensing units R1, R23, R3, and C6, The switching element Q1 is switched on and off at a low frequency and the switching element Q1 is switched on and off at a relatively high frequency at the point of time when the voltage is weak, The voltage waveform and the period are the same and the shapes are matched to improve the power factor.

Referring again to FIG. 4,

When the waveform of the one period voltage PV output from the rectifying unit 20 and detected by the voltage sensing units R1, R23, R3, and C6 is the same as shown in the drawing,

At the time when the voltage waveform PV starts, the control unit U1 shortly turns off the switching element Q1 after turning on the switching element Q1,

When the control unit U1 is turned on at a time point at which the intensity of the current induced by the transformer T1 is lowered as the current sensed by the current sensing unit R13 decreases and becomes zero as the switching element Q1 is turned off, Turns on the switching element Q1 and then turns off. At this time, since the voltage intensity of the voltage waveform is increased earlier than that before, the turn-off period is slightly longer, that is, Lt; / RTI >

Thus, the turn-on / turn-off period (i.e., the period) is turned on at each time point when the zero point is sensed by the current sensing unit R13 and is proportional to the voltage intensity at that time, When the turn-off period is long (i.e., switched to low frequency) and the turn-off period is gradually shortened (i.e., switched to high frequency) while going to both sides, the current Pi ), The waveform of the triangular waveform is the same as that of the triangular waveform, and the total current (PI) waveform of the average value connecting the current Pi waveforms has the same period and the same waveform as the voltage PV waveform, And the current (PI) are in phase and the power factor is improved.

The power factor of the pulsating power source improved by the present invention reaches 98%, and the power factor can be improved close to perfection.

The direct current unit 40 directs the output power induced on the secondary side of the transformer T1 to direct current and supplies the direct current to the load LED (L).

The direct current unit 40 includes diodes D7 and D8 for rectifying the output power of the transformer T1, a capacitor C5 for smoothing and direct current, and an overvoltage And a resistor R20 and a capacitor C18 as a snubber that restricts and protects the organic material.

And a line filter (LF3) for removing noise from a rated power supplied as an LED load is provided on the output side of the direct current part (40).

A regulator (not shown) for supplying power to a receiving module (for example, RS485, DALI, Zigbee, PIR sensor, RF / IR interface or the like) for receiving a dimming command signal from the outside by wire or wireless is provided on the output side of the DC unit 40 And a zener diode ZD3 for protecting the regulator U2 from an overvoltage and a connector CN4 for connecting the receiving module to the regulator U2 are connected.

A resistor R18 serves as a voltage sensing unit for sensing a voltage supplied to the load LED, and a resistor R31 serves as a current sensing unit for sensing a current supplied to the LED. And a dimming power supply unit 90 for providing a reference voltage for the power supply.

The resistor R18 as the voltage sensing unit provides the voltage sensed through the first terminal to the dimming control unit 70. The resistor R31 as the current sensing unit supplies the sensed current to the dimming And supplies the reference voltage for dimming to the dimming control unit 70 and the dimming interface unit 80 through the fifth terminal and the fifth terminal, respectively.

The dimming power supply unit 90 provides a reference voltage for dimming, that is, a maximum voltage (e.g., 10 volts) of a range of the dimming command signal that changes the illuminance of the LED. For example, when the dimming command signal has a range of 0 to 10 volts, the maximum voltage of 10 volts becomes a reference voltage for dimming and is provided to the dimming control unit 70 and the dimming interface unit 80. This reference voltage ensures that the dimming command signal received and recognized by the dimming interface unit 80 and the dimming control unit 70 does not exceed 10 volts by the diode D201 even if the dimming command signal is inputted at a magnitude larger than the reference voltage .

The dimming power supply unit 90 includes resistors R41, R42 and R26, a capacitor C26 and a variable regulator U3 so that the voltage output from the DC unit 40 can be adjusted to a desired size And converts it into an adjustable constant voltage to generate a reference voltage.

The dimming interface unit 80 provides the dimming command signal to the dimming control unit 70 while preventing the externally inputted dimming command signal from affecting the dimming control unit 70. When the input dimming command signal is below the minimum reference value And supplies the light-off signal to the dimming control unit 70 so as to be turned off.

Referring to FIG. 3B, the dimming interface 80 receives a dimming command signal through terminals 8 and 2 ', receives a reference voltage for dimming through terminal 5', receives a reference voltage for terminal 6 ' The driving power is inputted through the power supply.

The dimming command signal input through the terminals 8 and 2 'is input to the non-inverting terminal of the buffer U201-A and buffered. At this time, the fading portion 81 connected to the non-inverting terminal of the buffer U201- Is inverted and further faded so as to be buffered.

The fade unit 81 includes a transistor (field effect transistor FET) Q201 connected to a non-inverting terminal of the buffer U201-A so that a dimming command signal input thereto is inverted and buffered, And a capacitor C203 that is connected to the stage and causes the dimming command signal to be faded and buffered according to charge / discharge.

Referring to the circuit diagram of the dimming interface 80 of FIG. 3B and the diagram showing the relationship between the dimming command signal (dimming voltage) and the current of the LED (corresponding to the buffered dimming command signal) The process of inverting and fading the external dimming command signal by the fade unit 81 will be described below.

When a sensor switch for inputting an external dimming command signal is normally open, a strong dimming voltage (for example, 10 V) is input to the dimming command signal through the resistor R206. At this time, the capacitor C203 is charged with a dimming voltage The reference voltage input through the 5'th transistor Q201 in the turn-on state of the transistor Q201 is connected to both the resistors R208 and R208 connected to both sides of the non-inverting terminal of the buffer U201- R209 and a low voltage is applied to the non-inverting terminal of the buffer U201-A due to the voltage division. As a result, although a strong dimming voltage is input to the external dimming command signal, the non-inverting terminal of the buffer U201- The dimming command signal is inverted and buffered so that the LED module becomes minimum brightness.

When the sensor switch is turned on and the sensor switch is turned on and a weak dimming voltage (for example, 0 V) is input to the external dimming command signal, the capacitor C203 starts discharging and gradually changes the gate voltage of the FET transistor Q201 And the current flowing through the transistor Q201 changes linearly from the time when the gate voltage of the transistor Q201 reaches the drain voltage until the transistor Q201 is turned off by the subsequent discharge of the capacitor C203 The reference voltage input through 5 'from the gate voltage of the transistor Q201 to the turn-off of the transistor Q201 is connected to both the resistors R208, R208 connected to both sides of the non-inverting terminal of the buffer U201- R209 and the transistor Q201, the resistance component of the transistor Q201 gradually increases, and in this period, the non-inverting terminal of the buffer U201-A is divided into a voltage divider A gradually increasing voltage is applied, and consequently the external dimming command signal is buffered with its intensity fading-in continuously increasing. When the transistor Q201 is turned off, all the reference voltages are applied to the non-inverting terminal of the buffer U201-A, and the external dimming command signal is buffered to a certain size (e.g., 10 volts)

After the sensor switch is turned on and a weak dimming voltage (for example, 0 V) is inputted to the external dimming command signal, the buffer U201-U20 is turned on until the gate voltage (for example, 10 volts) of the transistor Q201 reaches the suture voltage. A is the time when the buffering of the external dimming command signal is not performed and the fade-in adjustment of the LED is delayed because the FET transistor Q201 is kept in the on state. At this time, the resistor R213 is added so that the voltage of the capacitor C203 becomes the divided voltage with the resistor R213 to shorten the delay time.

The capacitor C203 starts to be charged with a strong dimming voltage and the gate voltage of the transistor Q201 is switched to the resistance region Q2 according to the charging of the capacitor C203 when the sensor switch in the ON state is turned off, The voltage applied to the non-inverting terminal of the buffer U201-A is continuously reduced while the gate voltage of the transistor Q201 is gradually increased to reach the sourcing voltage and turned on, so that the dimming command signal is faded and buffered , The gate voltage of the transistor Q201 is gradually increased in accordance with the charging of the capacitor C203 and is kept constant after the LED module is faded out to the minimum brightness. At a time when buffering of the external dimming command signal is not performed in the buffer U201-A, that is, when the gate voltage of the transistor Q201 does not reach the resistance region due to the charging of the capacitor C203, Is in the turn-off state, and the fade-out adjustment of the LED is delayed. R213 is added so that the voltage divided by R213 is supplied to the gate of the FET transistor Q201 even when the voltage of C203 is 0 volts, thereby shortening the delay time.

The dimming command signal buffered in the buffer U201-A is output through the 4 'terminal, and the output dimming command signal is transmitted to the dimming controller 70 through the terminal No. 4,

In addition, the dimming command signal buffered in the buffer U201-A is input to the non-inverting terminal of the comparator U201-B via the resistor R202,

The comparator U201-B receives the reference voltage input through the resistor R205 through the resistor R205, divides the reference voltage into voltage and receives the voltage-divided reference voltage input to the inverting terminal and the non- When the dimming command signal is smaller than the voltage-divided reference voltage, the unlit signal is outputted through the terminal 7 'and transmitted to the dimming control unit 70. For example, when the reference voltage input through the 5 'terminal is 10V and the voltage divided reference voltage to the comparator is 1V, when the buffered dimming command signal is below 1V, the comparator is inactive (that is, 0V), and when it is 1V or more, the comparator operates and outputs high (12V).

The dimming control unit 70 outputs a voltage sensed by the voltage sensing unit R18 and a current sensed by the current sensing unit R31 to a dimming control unit 80 including a dimming command signal The dimming control signal is generated so that the dimming of the LED is controlled to be turned on at a constant illuminance and is transmitted to the power factor improving PWM unit 30 through the feedback unit 50 (P1).

Referring to FIG. 3C, the dimming control unit 70 receives the output voltage of the direct current unit 40, which is sensed by the resistor R18 of the voltage sensing unit through the first terminal, And receives the current detected by the resistor R31 of the current sensing unit through the terminal No. 4 and outputs the dimming signal to the 4th terminal of the dimming interface unit 80. [ ', Receives the reference voltage for dimming through the terminal 5, receives the driving power required for driving through the terminal 6, and receives the driving power required for the dimming control through the terminal 3 And outputs the dimming control signal to the photocoupler P1 of the feedback unit 50. [

The output voltage of the direct current unit 40 input to the first terminal is input to the IC U101 through the resistor R104. At this time, the low signal (0V; , The transistor Q101 maintains the turn-off state so that the output voltage of the direct current unit 40 is directly input to the IC U101 through the resistor R104 (12V) (when a dimming command signal of 1V or more is inputted in the dimming command signal having a range of 0 to 10V) is inputted to the terminal No. 7, the transistor Q101 is turned on and the output voltage of the direct current section 40 Is inputted to the IC U101 through the combined resistance of the two resistors R104 and R105 and the IC U101 is turned on when the voltage of the IC U101 is inputted to the high signal of the terminal 7, The DC voltage of the DC unit 40 is increased and output.

The output current of the DC unit 40 sensed by the resistor R31 of the current sensing unit and the output current of the dimming interface unit 0 of the dimming interface unit 0 are input to the fourth terminal of the IC U101, The output current of the direct current unit 40 is greatly attenuated through the resistor R31 of the current sensing unit and the current corresponding to the dimming command signal is supplied to the resistor R201 ) Through the relatively less attenuated. For example, if the output current of the dc portion 40 attenuated to a large extent through the resistor R31 of the current sensing portion has a magnitude of 1, then the resistor R201 connected to the terminal 4 ' The current due to the dimming command signal becomes a magnitude of 10 and the IC U101 has a relatively small influence on the output current of the dc portion 40 so that the current due to the relatively large dimming command signal Thereby generating a dimming control signal.

The dimming control unit 70 transmits a dimming control signal to stop the operation of the power factor improving PWM unit 30 when the signal inputted through the voltage sensing unit and the current sensing unit is a signal corresponding to a short or no load, .

The feedback unit 50 includes a dimming control unit 70 that is generated by comparing a voltage and current supplied from the DC unit 40, that is, a LED load, and a dimming command signal input through the dimming interface unit, To the control unit U1 of the power factor improving PWM unit 30 so that the control unit U1 can supply a stable and stable rated power (constant voltage or / and constant current) to the LED load, Thereby controlling the switching of the transistor Q1.

It may be preferable that the feedback unit 50 uses a photocoupler P1 in which the input and output (that is, the input side light emitting element and the output side light receiving element) are electrically insulated and the transmission of the signal is stable.

The photocoupler P1 of the feedback unit is supplied with driving power from the driving power supply unit 60 and the driving of the photocoupler P1 is controlled by the dimming control signal of the dimming control unit 70.

The driving power supply unit 60 includes a photocoupler P1 of the feedback unit 50, an IC U101 of the dimming control unit 70, a buffer U201-A of the dimming interface unit 80, U201-B).

The driving power supply unit 60 includes an auxiliary winding t2 magnetically coupled to a secondary side of the transformer T2, a diode D11 rectifying a voltage induced in the auxiliary winding t2, R4, R15, capacitors C13, C16, a transistor Q2, and a zener diode ZD2.

The driving power supplied to the driving power supply unit 60 is supplied to the photocoupler P1 via the resistor R32 and is supplied to the ICs of the dimming control unit 70 through the terminals 6 and 6 ' U101 of the dimming interface unit 80 and the buffer U201-A of the dimming interface unit 80 and the comparator U201-B.

While the present invention has been described in connection with what is presently considered to be the case, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And variations are to be construed as falling within the scope of protection of the present invention.

10: EMI filter 20: rectification part
30: Power factor improving PWM unit 40: DC part
50: feedback section 60: driving power supply section
70: dimming control unit 80: dimming interface unit
T1: Trance

Claims (4)

  1. A rectifying section for rectifying input power;
    A transformer for transforming the pulsating current power outputted from the rectifying section;
    A direct current (DC) unit for directing the output power of the transformer to the LEDs;
    A power factor improving PWM unit for controlling the switching of the transformer by a PWM method so as to supply a constant current to the LED and improving a power factor;
    A dimming control unit for transmitting a dimming control signal for adjusting the illuminance of the LED to the power factor improving PWM unit;
    And a dimming interface unit for buffering an externally input dimming command signal and transmitting the buffered dimming command signal to the dimming control unit,

    Wherein the dimming interface unit includes a fader unit for buffering the dimming command signal input from the outside in a continuously increasing or decreasing manner.
  2. The method according to claim 1,
    The dimming interface unit includes a buffer U201-A for buffering an externally input dimming command signal and a resistor R201 for transmitting a dimming command signal buffered in the buffer U201-A to the dimming control unit,
    The dimming control unit receives a current according to a dimming command signal output from the resistor R201 and a current output from a resistor R31 for sensing an output current of the DC unit to generate a dimming control signal, R31 attenuates the output current of the direct current portion and the dimming control signal generated by the dimming control portion is determined by the current output by the resistor R201.
  3. 3. The method of claim 2,
    The dimming interface unit includes a resistor R208 connected to a non-inverting terminal of the buffer U201-A to provide a reference voltage, and a resistor R208 connected to a non-inverting terminal of the buffer U201- Gt; R209 < / RTI >

    The fade section is connected in series to the resistor R209,
    When the dimming command signal input from the outside is a high signal in the off state, the dimming command signal of the inverted low signal for the lowest illuminance is turned on to be inputted to the buffer U201-A,
    And a transistor Q201 that is turned off when a dimming command signal input from the outside is a low signal and the dimming command signal of the inverted high signal for the maximum illumination is inputted to the buffer U201-A And a second dimming function of the LED dimming converter.
  4. The method of claim 3,
    The fade section
    A capacitor C203 connected to the gate terminal of the transistor Q201 and charged / discharged by a dimming command signal input from the outside to fade the dimming command signal,
    Further comprising a resistor (R213) connected in series to the capacitor (C203) to reduce a turn-on delay time of the transistor (Q201).
KR20130070336A 2013-06-19 2013-06-19 LED converter with two steps dimming function KR101477158B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101557655B1 (en) * 2015-04-16 2015-10-06 김명상 advertisement lighting control system with WiFi
KR101896686B1 (en) 2017-08-04 2018-09-10 (주)디에스전기 A Led Dimming Lighting Lamp

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Publication number Priority date Publication date Assignee Title
KR100912133B1 (en) * 2009-05-25 2009-08-13 (주) 일성엘이디 Dimming-controllable led lamp
KR100940042B1 (en) * 2009-07-22 2010-02-04 주식회사 동운아나텍 Light emitting diode light driving apparatus
KR20110026749A (en) * 2009-09-08 2011-03-16 삼성전자주식회사 Backlight apparatus and display apparatus including the same
KR101057684B1 (en) * 2011-03-31 2011-08-18 주식회사 동운아나텍 Light driving apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100912133B1 (en) * 2009-05-25 2009-08-13 (주) 일성엘이디 Dimming-controllable led lamp
KR100940042B1 (en) * 2009-07-22 2010-02-04 주식회사 동운아나텍 Light emitting diode light driving apparatus
KR20110026749A (en) * 2009-09-08 2011-03-16 삼성전자주식회사 Backlight apparatus and display apparatus including the same
KR101057684B1 (en) * 2011-03-31 2011-08-18 주식회사 동운아나텍 Light driving apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101557655B1 (en) * 2015-04-16 2015-10-06 김명상 advertisement lighting control system with WiFi
KR101896686B1 (en) 2017-08-04 2018-09-10 (주)디에스전기 A Led Dimming Lighting Lamp

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