KR102365558B1 - Apparatus for removing afterglow of led lighting device, and led lighting device and apparatus for driving led lighting with the same - Google Patents

Abstract

The present invention relates to an apparatus for removing afterglow of an LED lighting lamp, which comprises: a discharge unit instantly discharging a current flowing through an LED module; a voltage distribution unit distributing an output voltage of a power unit; a reference voltage generation unit generating and outputting a reference voltage by using the output voltage from the voltage distribution unit; a micro-current sensing unit sensing a micro-current flowing through the LED module; a switch control unit outputting a driving signal for operating the discharge unit based on the reference voltage generated by the reference voltage generation unit or the microcurrent sensed by the micro-current sensing unit; and a voltage charging unit connecting a positive terminal of the LED module and a ground to supply a voltage when power is supplied to the LED module by the power unit or supply operation power for the apparatus for removing afterglow of an LED when supply of power from the power unit to the LED module is blocked. Accordingly, when the driving unit is turned off, a micro-current remaining in the LED module can be discharged by means of instant short-circuit, so that sporadic afterglow of the LED module caused by a difference in turn-off voltages of each of the LED lamps can be removed all at once.

Description

A device for removing afterglow of an LED light, a driving device for an LED light having the same, and an LED lighting device

The present invention relates to an LED lighting device, and more particularly, to an afterglow removal device for removing afterglow from an LED lighting lamp, a driving device for an LED lighting lamp having the same, and an LED lighting device.

The LED lamp has the advantage of emitting bright light even with low power due to good energy efficiency, and since it has a long lifespan and has little impact on the environment, the use of LED lighting devices using the LED lamp is rapidly increasing.

This LED lighting device has the advantage of significantly reducing the failure rate and making it very inexpensive by using a simple and high-performance dedicated LED driver IC, while flickering (Flicker, hereinafter, called 'flicker').

Therefore, in order to reduce such flicker, the LED lighting device is generally used to generate and use a complete DC voltage with almost no ripple by significantly increasing the capacity of an electrolytic capacitor, which is a smoothing circuit element included in the SMPC.

However, in order to improve the flicker problem, the large-capacity electrolytic capacitor increases the turn-off time of the LED lamp and causes a problem of showing an irregular turn-off state.

In the prior art, various technologies for solving the afterglow problem have been developed, and in Korean Patent No. 10-1768179, in an LED lamp employing a large-capacity capacitor (C1) to reduce the flicker phenomenon of the LED, a plurality of LED chips The LED unit connected in series/parallel and turned on according to the applied DC voltage; a smoothing circuit unit connected to the LED unit and having a large-capacity capacitor (C1) for supplying a DC voltage to the LED unit; a first rectifying circuit unit for half-wave rectifying the switching voltage transmitted through the transformer and supplying it to the smoothing circuit unit; and a switching control unit connected in parallel between the secondary side coil of the transformer and the LED unit, and controlling the LED unit current path to be on/off according to the switching voltage transmitted through the transformer to prevent delay and afterglow of the LED unit. ; and, the switching control unit includes: a second rectifier circuit unit having a diode and a small capacitance capacitor (C2) for rectifying and accumulating the switching voltage transmitted through the transformer; a switching device (Q1) connected between one side of the LED unit and a low voltage terminal, and being turned on and off according to an external driving signal to instantaneously control the on/off of the LED unit; and a pressure reducing unit disposed between the second rectifier circuit unit and the switching element Q1 and adjusting the voltage output from the second rectifier circuit unit to a preset voltage and applying it to the input terminal of the switching element; An afterglow prevention device is disclosed.

According to the above patent, when the switch is turned off, the switching element Q1 is turned off by the voltage stored in the small capacitor C2, thereby completely blocking the current path of the LED unit. However, in the case of the above patent, when the capacitance of the small-capacity capacitor C2 is greater than or equal to a specific value, the off-time of the switching element Q1 is delayed and the afterglow prevention effect is deteriorated.

On the other hand, as another method for removing the afterglow of the LED lighting device, it is also possible to remove the afterglow of the lamp by attaching a condenser for afterglow removal. In this case, when the switch is turned off, the afterglow by the microcurrent can be removed by storing the microcurrent going to the LED lamp by the afterglow removal capacitor. However, this conventional afterglow removal method has a problem in that the afterglow occurs again when the switch is turned off enough to exceed the microcurrent storage capacity of the afterglow removal capacitor.

In addition, as described above, in the conventional afterglow removal method using the afterglow removal capacitor, when the switch is off, the current through the LED does not flow to the LED converter, but is bypassed to the afterglow removal capacitor through the resistor and flows, There are no symptoms such as afterglow or glare. In this case, the change in actual effective power consumption is not large, so if the power factor rate is not applied as in a house, there is little change in the rate due to the attachment of the afterglow removal capacitor, but the actual flowing current and the apparent power show a huge difference. In particular, since the afterglow removal capacitor is connected in parallel to the 220V line, when the switch is on, the power factor is greatly reduced and the current is greatly increased. Accordingly, there is no increase in rates for users who are not subject to the power factor rate (eg, households, etc.), but from the standpoint of current providers (eg, KEPCO, etc.), the supply current is greatly increased. For example, the current provider supplies a current of 344 mA, and the electricity bill may only receive a charge corresponding to 47 mA. In addition, such an increase in current has a problem in that the thickness of the wire must be greatly increased, and this problem has a problem in that the increase in the current becomes larger when viewed in an apartment or a pole/underground transformer in a large-scale dense area. That is, the conventional method for removing afterglow using a capacitor for removing afterglow has a problem in that it imposes a burden on the current provider in terms of charges and facilities.

Korean Patent No. 10-1768179

Therefore, the present invention is an LED lighting device including a plurality of LED lamps, by not generating additional power consumption, thereby not burdening the electricity provider in terms of charges and facilities, and effectively removes afterglow. An object of the present invention is to provide an afterglow removal device, a driving device for an LED lighting lamp having the same, and an LED lighting device.

In addition, the present invention can collectively discharge the minute current remaining in the LED module due to a momentary short circuit when the power of the driving unit is turned off, and thus, sporadically of the LED module due to the difference in the turn-off voltage of each of the LED lamps. An object of the present invention is to provide an afterglow removal device for an LED lighting lamp capable of removing the afterglow phenomenon at once, a driving device for an LED lighting lamp having the same, and an LED lighting device.

In addition, the present invention accurately detects the power-off moment of the driving unit and short-circuits the LED module at the correct moment, thereby improving the operation efficiency of the LED lighting device. And to provide an LED lighting device.

In addition, the present invention determines whether afterglow has occurred in at least one of the LED lamps based on a preset afterglow generation condition, and when the afterglow occurs, a current flowing through the LED module is instantaneously discharged to remove the afterglow. To provide an afterglow removal device, a driving device for an LED lighting lamp having the same, and an LED lighting device.

In order to achieve the above object, the device for removing afterglow of an LED lighting lamp provided in the present invention is an LED afterglow removal device for removing afterglow when at least one LED lamp among a plurality of LED lamps included in the LED lighting device has afterglow. , based on a preset afterglow reference voltage value and an afterglow reference current range to determine whether afterglow occurs in the LED lamp, a current value flowing through the plurality of LED modules, and an output voltage of a power supply supplying power to the LED module It is determined whether the condition for generating the afterglow is satisfied, and when the condition for generating the afterglow is satisfied, the current flowing through the LED module is instantaneously discharged to remove the afterglow generated in the at least one LED lamp at once do it with

Preferably, the LED afterglow removal device includes: a discharge unit for instantaneously discharging the current flowing through the LED module; a voltage divider dividing the output voltage of the power supply unit; a reference voltage generator generating and outputting an output voltage of the voltage divider as a reference voltage; a micro-current sensing unit for detecting a micro-current flowing through the LED module; a switch control unit outputting a driving signal for operating the discharge unit based on the reference voltage generated by the reference voltage generator or the microcurrent sensed by the microcurrent sensing unit; And it is connected between the (+) terminal of the LED module and the ground to charge a voltage when power is supplied to the LED module from the power supply, and when the power supply to the LED module from the power supply is cut off, the LED afterglow removal device It may include a voltage charger for supplying operating power.

On the other hand, in order to achieve the above object, the driving device of the LED lighting provided by the present invention, a plurality of LED lamps are mounted on a printed circuit board LED module; a power supply unit for supplying power to the LED module in response to on/off of external power; and an LED afterglow removal device for removing afterglow when the at least one LED lamp occurs, wherein the LED afterglow removal device includes a preset afterglow reference voltage value and an afterglow reference current to determine whether afterglow occurs in the LED lamp Based on the range, it is determined whether the output voltage of the power supply unit and the current value flowing through the LED module satisfy the condition for generating the afterglow, and when the condition for generating the afterglow is satisfied, the current flowing through the LED module is instantaneously and an LED afterglow removal device for temporarily removing the afterglow generated in the at least one LED lamp by discharging it to

In addition, in order to achieve the above object, the LED lighting device provided in the present invention, the LED lighting device, at least one LED lamp; an LED module in which the LED lamps are mounted on a printed circuit board; a power supply unit for supplying power to the LED module in response to on/off of external power; and an LED afterglow removal device for removing afterglow when the at least one LED lamp occurs, wherein the LED afterglow removal device includes: a discharge unit for instantaneously discharging a current flowing through the LED module; a voltage divider dividing the output voltage of the power supply unit; a reference voltage generator generating and outputting the output voltage of the voltage divider as a reference voltage, and generating and outputting a reference voltage with a value inversely proportional to the output voltage of the voltage dividing unit; a micro-current sensing unit for detecting a micro-current flowing through the LED module; Based on a preset afterglow reference voltage value and an afterglow reference current range to determine whether or not afterglow occurs in the LED lamp, the reference voltage generated by the reference voltage generator or the microcurrent detected by the microcurrent detection unit generates afterglow a switch control unit that determines whether a condition for generating an afterglow is satisfied, and outputs a driving signal for operating the discharge unit when the condition for generating an afterglow is satisfied; And it is connected between the (+) terminal of the LED module and the ground to charge a voltage when power is supplied to the LED module from the power supply, and when the power supply to the LED module from the power supply is cut off, the LED afterglow removal device It characterized in that it includes a voltage charging unit for supplying operating power.

The afterglow removal device of the LED lighting lamp of the present invention as described above, the driving device of the LED lighting lamp having the same, and the LED lighting device relate to an LED lighting device including a plurality of LED lamps, and by not generating additional power consumption, , there is an advantage in that afterglow can be effectively removed without burdening the electricity provider in terms of charges and facilities.

In addition, the present invention can collectively discharge the minute current remaining in the LED module due to a momentary short circuit when the power of the driving unit is turned off, and thus, sporadically of the LED module due to the difference in the turn-off voltage of each of the LED lamps. There is an advantage that the afterglow phenomenon can be removed at once.

In addition, the present invention has the advantage of being able to improve the operation efficiency of the LED lighting device by accurately detecting the power-off moment of the driving unit and shorting the LED module at the correct moment.

1 is a schematic block diagram of a driving device for an LED lighting lamp according to an embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating the voltage divider of FIG. 1 .
FIG. 3 is a circuit diagram schematically illustrating a reference voltage generator of FIG. 1 .
FIG. 4 is a diagram for explaining a relationship between an input voltage and an output voltage in the reference voltage generator of FIG. 3 .
FIG. 5 is a circuit diagram schematically illustrating the microcurrent sensing unit of FIG. 1 .
6 is a circuit diagram schematically illustrating the switch control unit of FIG. 1 .
FIG. 7 is a circuit diagram schematically illustrating the voltage charging unit of FIG. 1 .

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, but it will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily practice the present invention. However, the present invention may be implemented in several different forms and is not limited to the embodiments described herein. On the other hand, in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. In addition, even if the detailed description is omitted, descriptions of parts that can be easily understood by those skilled in the art are omitted.

Throughout the specification and claims, when a part includes a certain element, it means that other elements may be further included, rather than excluding other elements, unless specifically stated to the contrary.

1 is a schematic block diagram of a driving device for an LED lighting lamp according to an embodiment of the present invention. Referring to FIG. 1 , a driving device for an LED lighting lamp according to an embodiment of the present invention includes an LED power supply unit 10 , an LED module 20 , and an LED afterglow removal device 100 .

The LED power supply unit 10 supplies power to the LED module 20 in response to on/off of the external power source. That is, the LED power supply unit 10 supplies power to turn on a plurality of LED lamps included in the LED lighting, but converts an externally applied AC power (AC) into a DC power (DC) and outputs it. In this case, the LED power supply unit 10 may include a large-capacity electrolytic capacitor 11 in order to improve the flicker phenomenon of the LED lamp.

In the LED module 20 , a plurality of LED lamps are mounted on a printed circuit board (PCB), and the LED lamps are driven by power supplied from the LED power supply unit 10 .

The LED afterglow removal device 100 removes the afterglow generated in at least one of a plurality of LED lamps mounted on the LED module 20 . That is, the LED afterglow removal device 100 is generated by the microcurrent remaining in the LED module 20 when the external power is turned off, and sporadically generated due to the difference in the turn-off voltage of each of the LED lamps, afterglow Remove at once

To this end, the LED afterglow removal device 100 is based on a preset afterglow reference voltage value (eg, 1.21V, etc.) and an afterglow reference current range (eg, 10mA to 20mA, etc.), the current value flowing through the LED module 20 , and it is determined whether the output voltage of the LED power supply unit 10 satisfies the condition for generating the afterglow, and when the condition for generating the afterglow is satisfied, the current flowing through the LED module 20 is instantaneously discharged to the at least one Temporarily removes the afterglow generated by the LED lamp.

For example, the LED afterglow removal device 100 is a result of comparing the voltage value (Vcontrol) generated by dividing the output voltage of the LED power supply unit 10 and the afterglow reference voltage value (1.21V), or the LED module 20 Based on the comparison result of the fine current (Io) flowing in the afterglow reference current range (10mA ~ 20mA), it is determined whether or not afterglow occurs due to the off of the external power source, and when it is determined that afterglow has occurred, the LED module 20 The flowing current can be instantly discharged.

As illustrated in FIG. 1 , the LED afterglow removal device 100 includes a voltage division unit 110 , a reference voltage generation unit 120 , a microcurrent sensing unit 130 , a switch control unit 140 , and a discharge unit 150 . , and a voltage charging unit 160 .

The voltage divider 110 divides and outputs the output voltage Vin of the LED power unit 10 . To this end, the voltage divider 110 is configured by connecting a plurality of resistors in series, and outputs the output voltage Vin by dropping the LED power supply unit 10 .

2 is a circuit diagram illustrating such a voltage divider 110. Referring to FIG. 2, the voltage divider 110 includes two resistors R1, R2 (111, 112) connected in series, and an LED. It is connected between the output terminal of the power supply unit 10 and the ground terminal (GND) to output the output voltage Vcontrol in which the output voltage Vin of the LED power supply unit 10 is lowered. At this time, when a capacitor connected in parallel to the pull-down resistor (R2) 112 of the voltage divider 110 is added, the noise of the (+) terminal voltage of the LED module 20 can be removed and output. there is.

On the other hand, when the level of the resistors R1, R2 (111, 112) provided in the voltage divider 110 increases, the output voltage Vcontrol of the voltage divider 110 proportionally increases, and thus, The voltage divider 110 may output voltages of various levels.

The output voltage Vcontrol of the voltage divider 110 is transmitted to the reference voltage generator 120 , and the reference voltage generator 120 converts the output voltage Vcontrol to generate a reference voltage Vref and outputs it. do.

3 is a circuit diagram schematically illustrating the reference voltage generator 120 of FIG. 1 . Referring to FIG. 3 , the reference voltage generator 120 includes a peak voltage detector 121 , a differential amplifier 122 , and and a current stabilizing unit 123 .

The peak voltage detection unit 121 detects the peak voltage and the lowest voltage included in the output voltage Vcontrol of the voltage divider 110 . That is, when the voltage input to the LED power supply unit 10 is changed, the output voltage (Vcontrol) of the voltage divider 110 is also changed based on the amount of change of the input voltage, and the peak voltage detecting unit 121 responds to the change. The highest value of the output voltage Vcontrol, that is, the peak voltage, and the lowest value, that is, the lowest voltage, of the output voltage Vcontrol are sensed.

The differential amplifier 122 generates a reference voltage Vref in response to the output signal V1 of the peak voltage detection unit 121 . That is, the differential amplifier 122 compares the output signal V1 with a preset afterglow reference voltage value V2 , and outputs a reference voltage Vref as a result. When this is output, the reference voltage Vref is decreased, and when the lowest voltage is output from the peak voltage sensing unit 121, the reference voltage Vref is increased and output.

To this end, the differential amplifier 122 includes the first NMOS transistor NM1 to which the output signal V1 of the peak voltage detection unit 121 is applied to the gate, and the second NMOS transistor NM1 to which the afterglow reference voltage value V2 is applied to the gate. a differential unit 122-1 including two NMOS transistors NM2 and a plurality of resistors Ro1 and Ro2 connected in series to source terminals of the first and second NMOS transistors NM1 and NM2, respectively; a first PMOS transistor (PM1) (122-2) connected to the drain of the first NMOS transistor (NM1); a current mirror unit 122-3 connected to the drain of the second NMOS transistor NM2 and including second and third PMOS transistors PM2 and PM3; a voltage-to-current converter (122-4) comprising a third NMOS transistor (NM3) connected between the differential unit (122-1) and the ground and converting the voltage output from the differential unit (122-1) into a current; and a resistor Ro3 connected between the output terminal and the ground terminal of the current mirror unit 122-3 to convert the current output from the current mirror unit 122-3 into a voltage to generate a reference voltage Vref. It is configured to include a voltage converter (122-5).

The current stabilizing unit 123 generates a propagation current from the output voltage of the voltage dividing unit 110 to stabilize the current. That is, the current stabilizing unit 123 generates a propagation current and then transfers the propagation current to the gate of the third NMOS transistor NM3 .

Meanwhile, the operation of the differential amplifier 122 configured as described above will be described as follows.

First, when the output signal V1 of the peak voltage sensing unit 121 is output as a peak voltage, the first NMOS transistor NM1 flows more current than the second NMOS transistor NM2 (I1 > Ia). Accordingly, the output current Ib of the current mirror unit 122 - 3 decreases, and accordingly, the level of the reference voltage Vref, which is the output voltage of the differential amplifier 122 , decreases.

Conversely, when the output signal V1 of the peak voltage sensing unit 121 is output as the lowest voltage, the second NMOS transistor NM2 flows more current than the first NMOS transistor NM1 (I1 < Ia). For this reason, the output current Ib of the current mirror unit 122 - 3 increases, and accordingly, the level of the reference voltage Vref which is the output voltage of the differential amplifier 122 increases.

As such, when the voltage Vcontrol input to the reference voltage generator 120 increases, that is, when the voltage Vac input to the LED power supply unit 10 increases, the peak voltage detection unit 121 detects the peak voltage. output, and accordingly the output of the differential amplifier 122, that is, the reference voltage Vref, decreases.

Conversely, when the voltage Vcontrol input to the reference voltage generator 120 decreases, that is, when the voltage Vac input to the LED power supply unit 10 decreases, the peak voltage detection unit 121 outputs the lowest voltage. and the output of the differential amplifier 122, that is, the reference voltage Vref, increases accordingly.

FIG. 4 is a diagram for explaining the relationship between an input voltage and an output voltage in the reference voltage generator 120 of FIG. 3 , and FIG. 4A is an input voltage (ie, voltage division) of the reference voltage generator 120 of FIG. The output voltage (ie, reference voltage) Vref of the reference voltage generator 120 according to the output voltage of the distribution unit 110 (Vcontrol) shows a change, and FIG. 4B shows the reference voltage generator 120 . . Referring to FIG. 4A , when the input voltage (ie, the output voltage of the voltage divider 110 ) Vcontrol of the reference voltage generator 120 is 1V and 3V, the voltage When (Vcontrol) is 1V, it can be seen that the reference voltage (Vref) is larger. Also, referring to FIG. 4B , the output voltage of the reference voltage generator 120 according to the input voltage (ie, the output voltage of the voltage divider 110 ) Vcontrol of the reference voltage generator 120 . It can be seen that (ie, the reference voltage) (Vref) is inversely proportional.

At this time, the output voltage (ie, the reference voltage) (Vref) of the reference voltage generator 120 according to the input voltage (ie, the output voltage of the voltage divider 110) (Vcontrol) of the reference voltage generator 120 . The reason for this change as illustrated in (a) of FIG. 4 is that the current value I3 of the voltage-current converter (NM3) 122-4 of FIG. 3 is the value of the propagation current generated by the current stabilization unit 123. because it follows

Meanwhile, referring to Equations 1 to 5 below, in the reference voltage generating unit 120 illustrated in FIGS. 1 and 3 , the reference voltage is caused by a change in the input voltage Vin input from the LED power supply unit 10 . It can be seen that (Vref) fluctuates.

은 전압 분배부(110)에서 분배된 전압값이다.At this time,

is a voltage value divided by the voltage divider 110 .

As described above, the reference voltage generator 120 of the present invention sets the reference voltage Vref to be inversely proportional to the change value of the voltage divider 110 . That is, when a low voltage is inputted through the voltage divider 110 , a high-value reference voltage Vref is output, and when a high voltage is inputted through the voltage divider 110 , a low-value reference voltage Vref is output. By doing so, the accuracy of the measurement at low voltage was improved.

This is because the purpose of the present invention is to remove afterglow occurring at a low voltage. In addition, the loss of the current setting unit ( 131 of FIG. 5 ), which will be described later, can be minimized when the accuracy of the measurement at a low voltage is improved.

On the other hand, the micro-current sensing unit 130 of FIG. 1 is a configuration for detecting the micro-current flowing in the LED module 20, and a circuit diagram schematically illustrating the micro-current detecting unit 130 is shown in FIG. .

Referring to FIG. 5 , the micro-current sensing unit 130 includes a current setting unit 131 ; and a bypass unit 132 .

The current setting unit 131 is composed of a resistor connected between the (-) terminal of the LED module 20 and the ground, and outputs a voltage corresponding to the minute current flowing through the LED module 20 . To this end, the current setting unit 131 may use a non-inductive resistance of less than 0.05 to 10 Ω.

In particular, the current setting unit 131 may be set so that 192 mV to less than 208 mV can be generated at the connection point with the (-) terminal of the LED module 20 . That is, when converting the voltage into a current, the current setting unit 131 determines 5 to 20 mA as a residual current, and the 5 to 20 mA current can be set by adjusting the resistance value constituting the current setting unit 131 . . For example, the resistance value may be set to 8.2 ~ 51Ω. Numerically, when the resistance value is set to 40 Ω, the current value may be set to 5 mA, and when the resistance value is set to 10 Ω, the current value may be set to 20 mA.

The bypass unit 132 is connected in parallel with the current setting unit 131 so that a voltage exceeding a preset bypass voltage (eg, 0.3 to 0.6 Vdc) does not affect the current setting unit 131 to bypass it. do. To this end, the bypass unit 132 is preferably formed of a diode having a voltage applied to it of 0.3 to 0.6 Vdc. For this reason, the bypass unit 132 may prevent the current setting unit 131 from being burned out due to overcurrent.

By configuring in this way, the power consumption of the current setting unit 131 is 2.25 mW, and the power consumption of the bypass unit 132 is 0.3 W, so that the product can be miniaturized.

The switch control unit 140 generates and outputs a driving signal Vout for operating the discharge unit 150 , but in the reference voltage Vref generated by the reference voltage generation unit 120 or the microcurrent sensing unit 130 . The driving signal Vout may be generated based on the voltage Vsen corresponding to the sensed microcurrent Io.

6 is a circuit diagram schematically illustrating such a switch control unit 140 . Referring to FIGS. 1 and 6 , the switch control unit 140 includes the reference voltage Vref generated by the reference voltage generation unit 120 and the afterglow A first comparator 141 comparing the reference voltage value V2, a voltage divider 142 that divides the afterglow reference voltage value V2 based on a plurality of series-connected resistors, and an output of the voltage divider 142 a second comparator 143 comparing the voltage Vsen detected by the voltage and the microcurrent sensing unit 130; and a driving unit 144 that generates the driving signal Vout based on the comparison results of the first and second comparators 141 and 143 . In the example of FIG. 6 , the voltage divider 142 is implemented by resistors having resistance values of 1KΩ and 200Ω. This is a value set to determine whether the voltage Vsen corresponding to the microcurrent Io sensed by the microcurrent sensing unit 130 corresponds to a preset afterglow reference current range.

At this time, the first comparator 141 compares the voltage value of the reference voltage Vref generated by the reference voltage generator 120 with a preset afterglow reference voltage value V2 (eg, 1.21V), and the LED power supply unit It is determined whether the output voltage of (10) satisfies the afterglow generation standard, and the second comparator 143 sets the voltage Vsen corresponding to the microcurrent output from the microcurrent sensing unit 130 and the afterglow reference voltage. It is determined whether the microcurrent of the LED module 20 corresponds to a preset afterglow reference current range (eg, 10mA to 20mA, etc.) by comparing the voltage value divided by the value V2.

In addition, when any one of the outputs of the first comparator 141 and the second comparator 143 satisfies the condition for driving the discharge unit 150 , the driving unit 144 generates the driving signal Vout. Accordingly, the driving unit 144 may be implemented by an OR circuit that generates the driving signal Vout by logical sum of the output of the first comparator 141 and the output of the second comparator 143 .

The discharge unit 150 instantaneously discharges the current flowing through the LED module 20 . To this end, the discharge unit 150 is connected between the (+) terminal of the LED module 20 and the (-) terminal of the LED module, and the driving signal Vout output from the switch control unit 140 is applied to the gate terminal. It is composed of a power transistor that becomes a power transistor, and by short-circuiting the LED module 20 in response to a driving signal higher than the threshold voltage of the power transistor, the current flowing through the LED module 20 is momentarily discharged. Due to this, a plurality of LED lamps mounted on the LED module 20 can be turned off at once regardless of their respective turn-off voltages.

The voltage charging unit 160 is connected between the (+) terminal of the LED module 20 and the ground, and charges a voltage when power is supplied from the LED power supply unit 10 to the LED module 20 , and then from the LED power supply unit 10 . When the power supply to the LED module 20 is cut off, the operating power for operating the LED afterglow removal device 100 is supplied.

FIG. 7 is a circuit diagram schematically illustrating such a voltage charging unit 160 . Referring to FIGS. 1 and 7 , the voltage charging unit 160 is a capacitor charged when supplied from the LED power supply unit 10 to the LED module 20 . (162); and a reverse current prevention unit 161 for preventing the voltage charged in the capacitor 162 from flowing backward to the LED power supply unit 10 . In this case, the reverse current prevention unit 161 is preferably implemented as a diode having a low threshold voltage (eg, 0.3 to 0.6V). This is because the consumption current of the LED afterglow removal device of the present invention is 0.5 to 10 mA, and the domestic voltage is usually less than 24Vdc to 50Vdc. Accordingly, the reverse current prevention unit 161 may be implemented as a 60Vdc 1A diode. However, when the voltage used is higher, the reverse current prevention unit 161 may be configured by increasing the withstand voltage of the diode.

As such, in the present invention, when the power of the driving unit is turned off, the minute current remaining in the LED module can be collectively discharged due to a momentary short circuit. It has the characteristic of being able to remove the sporadic afterglow phenomenon at once. In addition, the present invention has a feature that can improve the operating efficiency of the LED lighting device by accurately detecting the power-off moment of the driving unit and short-circuiting the LED module at the correct moment.

In the above, embodiments of the present invention have been described, but the scope of the present invention is not limited thereto, and the present invention is easily changed from the embodiments by those of ordinary skill in the art to which the present invention pertains and recognized as equivalent. including all changes and modifications to the scope of

10: LED power supply unit 20: LED module
100: LED afterglow removal device 110: voltage divider
120: reference voltage generation unit 121: peak voltage detection unit
122: differential amplifier 123: current stabilization unit
130: micro-current sensing unit 140: switch control unit
150: discharge unit 160: voltage charging unit

Claims (23)

In the LED afterglow removal device for removing afterglow when at least one LED lamp among a plurality of LED lamps included in the LED lighting device is generated,
Based on the preset afterglow reference voltage value and afterglow reference current range to determine whether the afterglow of the LED lamp occurs, the current value flowing through the LED module on which the plurality of LED lamps are mounted, and power to the LED module It is determined whether the output voltage of the power supply satisfies the condition for generating the afterglow, and when the condition for generating the afterglow is satisfied, the current flowing through the LED module is instantaneously discharged to remove the afterglow generated in the at least one LED lamp at once. Remove, but
The LED afterglow removal device is
a discharging unit for instantaneously discharging the current flowing through the LED module;
a voltage divider dividing the output voltage of the power supply unit;
a reference voltage generator generating and outputting an output voltage of the voltage divider as a reference voltage;
a micro-current sensing unit for detecting a micro-current flowing through the LED module; and
a switch control unit outputting a driving signal for operating the discharge unit based on the reference voltage generated by the reference voltage generator or the microcurrent sensed by the microcurrent sensing unit;
The switch control unit
a first comparator comparing the reference voltage and the afterglow reference voltage;
a second comparator comparing the voltage value divided from the afterglow reference voltage value with the voltage detected by the micro-current sensing unit; and
and a driving unit for generating a driving signal for operating the discharge unit based on the comparison result of the first and second comparators. delete The method of claim 1, wherein the discharge unit
Consists of a power transistor connected between the (+) terminal of the LED module and the (-) terminal of the LED module and to which a driving signal output from the switch control unit is applied to a gate terminal,
The power transistor is
LED afterglow removal device, characterized in that for short-circuiting the LED module in response to a driving signal higher than the threshold voltage of the power transistor. According to claim 1, wherein the voltage divider
LED afterglow removal device, characterized in that the plurality of resistors are connected in series, characterized in that the output by dropping the output voltage of the power supply. The method of claim 1, wherein the reference voltage generator
a peak voltage detector for detecting a peak voltage included in the output voltage of the voltage divider;
a differential amplifier for generating a reference voltage in response to the output signal of the peak voltage detector; and
LED afterglow removal device comprising a current stabilizing unit for stabilizing the current by generating a propagation current from the output voltage of the voltage divider. 6. The method of claim 5, wherein the differential amplifier is
a differential unit including a first NMOS transistor to which the output signal of the peak voltage sensing unit is applied to a gate and a second NMOS transistor to which the afterglow reference voltage value is applied to the gate;
a first PMOS transistor coupled to a drain of the first NMOS transistor;
a current mirror connected to the drain of the second NMOS transistor;
a voltage-to-current converter connected to the differential unit to convert a voltage output from the differential unit into a current; and
LED afterglow removal device comprising a current-to-voltage converter for generating the reference voltage by converting the current output from the current mirror unit into a voltage. According to claim 1, wherein the micro-current sensing unit
and a current setting unit connected between the (-) terminal of the LED module and the ground,
The current setting unit
LED afterglow removal device, characterized in that it is composed of a resistor for sensing a voltage corresponding to the minute current flowing through the LED module. The method of claim 7, wherein the micro-current sensing unit
LED afterglow removal device further comprising a bypass unit connected in parallel with the current setting unit to bypass the voltage exceeding a preset bypass voltage from affecting the current setting unit. delete According to claim 1, wherein the LED afterglow removal device
It is connected between the (+) terminal of the LED module and the ground to charge a voltage when power is supplied to the LED module from the power source, and when the power supply to the LED module from the power source is cut off, the operation of the LED afterglow removal device LED afterglow removal device, characterized in that it further comprises a voltage charging unit for supplying power. 11. The method of claim 10, wherein the voltage charging unit
a capacitor charging the voltage; and
LED afterglow removal device comprising a reverse current prevention unit for preventing the voltage charged in the capacitor from flowing back to the power supply unit. In the driving device of the LED light,
LED module in which a plurality of LED lamps are mounted on a printed circuit board;
a power supply unit for supplying power to the LED module in response to on/off of external power; and
and an LED afterglow removal device for removing afterglow when at least one of the plurality of LED lamps has afterglow,
The LED afterglow removal device is
Based on a preset afterglow reference voltage value and an afterglow reference current range to determine whether afterglow has occurred in at least one of the plurality of LED lamps, the output voltage of the power supply unit and the current value flowing through the LED module determine afterglow It is determined whether or not the condition for generating the afterglow is satisfied, and when the afterglow generation condition is satisfied, the current flowing through the LED module is instantaneously discharged to remove the afterglow generated in at least one of the plurality of LED lamps at once. Including an LED afterglow removal device to remove,
The LED afterglow removal device is
a discharging unit for instantaneously discharging the current flowing through the LED module;
a voltage divider dividing the output voltage of the power supply unit;
a reference voltage generator generating and outputting an output voltage of the voltage divider as a reference voltage;
a micro-current sensing unit for detecting a micro-current flowing through the LED module; and
a switch control unit outputting a driving signal for operating the discharge unit based on the reference voltage generated by the reference voltage generator or the microcurrent sensed by the microcurrent sensing unit;
The switch control unit
a first comparator comparing the reference voltage and the afterglow reference voltage;
a second comparator comparing the voltage value divided from the afterglow reference voltage value with the voltage detected by the micro-current sensing unit; and
and a driving unit generating a driving signal for operating the discharge unit based on a comparison result of the first and second comparators. delete 13. The method of claim 12, wherein the discharge unit
Consists of a power transistor connected between the (+) terminal of the LED module and the (-) terminal of the LED module and to which a driving signal output from the switch control unit is applied to a gate terminal,
The power transistor is
A driving device for an LED lighting lamp, characterized in that the LED module is short-circuited in response to a driving signal higher than a threshold voltage of the power transistor. 13. The method of claim 12, wherein the voltage divider
A plurality of resistors are connected in series, and the output voltage of the power supply is lowered and outputted. 13. The method of claim 12, wherein the reference voltage generator
a peak voltage detector for detecting a peak voltage included in the output voltage of the voltage divider;
a differential amplifier for generating a reference voltage in response to the output signal of the peak voltage detector; and
and a current stabilizing unit for stabilizing the current by generating a propagation current from the output voltage of the voltage dividing unit. 17. The method of claim 16, wherein the differential amplifier is
a differential unit including a first NMOS transistor to which the output signal of the peak voltage sensing unit is applied to a gate and a second NMOS transistor to which the afterglow reference voltage value is applied to the gate;
a first PMOS transistor coupled to a drain of the first NMOS transistor;
a current mirror connected to the drain of the second NMOS transistor;
a voltage-to-current converter connected to the differential unit to convert a voltage output from the differential unit into a current; and
and a current-to-voltage converter for generating the reference voltage by converting the current output from the current mirror unit into a voltage. The method of claim 12, wherein the micro-current sensing unit
and a current setting unit connected between the (-) terminal of the LED module and the ground,
The current setting unit
A driving device for an LED light, characterized in that it is composed of a resistor that senses a voltage corresponding to the minute current flowing through the LED module. The method of claim 18, wherein the micro-current sensing unit
The driving device of an LED lighting lamp, which is connected in parallel with the current setting unit, further comprising a bypass unit for bypassing the voltage exceeding a preset bypass voltage from affecting the current setting unit. delete 13. The method of claim 12, wherein the LED afterglow removal device
It is connected between the (+) terminal of the LED module and the ground to charge a voltage when power is supplied to the LED module from the power source, and when the power supply to the LED module from the power source is cut off, the operation of the LED afterglow removal device The driving device of the LED lighting lamp, characterized in that it further comprises a voltage charging unit for supplying power. The method of claim 21, wherein the voltage charging unit
a capacitor charging the voltage; and
and a reverse current prevention unit for preventing the voltage charged in the capacitor from flowing backward to the power supply unit. In the LED lighting device,
at least one LED lamp;
an LED module in which the LED lamps are mounted on a printed circuit board;
a power supply unit for supplying power to the LED module in response to on/off of external power; and
Including an LED afterglow removal device for removing the afterglow when the at least one LED lamp occurs,
The LED afterglow removal device is
a discharging unit for instantaneously discharging the current flowing through the LED module;
a voltage divider dividing the output voltage of the power supply unit;
a reference voltage generator generating and outputting the output voltage of the voltage divider as a reference voltage, and generating and outputting a reference voltage with a value inversely proportional to the output voltage of the voltage dividing unit;
a micro-current sensing unit for detecting a micro-current flowing through the LED module;
Based on a preset afterglow reference voltage value and an afterglow reference current range to determine whether or not afterglow occurs in the LED lamp, the reference voltage generated by the reference voltage generator or the microcurrent sensed by the microcurrent detection unit produces afterglow a switch control unit that determines whether a condition for generating an afterglow is satisfied, and outputs a driving signal for operating the discharge unit when the condition for generating an afterglow is satisfied; and
It is connected between the (+) terminal of the LED module and the ground to charge a voltage when power is supplied to the LED module from the power source, and when the power supply to the LED module from the power source is cut off, the operation of the LED afterglow removal device a voltage charger for supplying power;
The switch control unit
a first comparator comparing the reference voltage and the afterglow reference voltage;
a second comparator comparing the voltage value divided from the afterglow reference voltage value with the voltage sensed by the micro-current sensing unit; and
and a driving unit generating a driving signal for operating the discharge unit based on a comparison result of the first and second comparators.

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