KR101046081B1 - LED lighting device - Google Patents

Abstract

The present invention relates to an LED lighting device which is capable of color color control and brightness control and improves efficiency by selectively driving red, green, and blue LEDs. The present invention relates to a power terminal unit to which an AC voltage is applied, and an AC voltage of the power terminal unit. The voltage rectification and voltage sensing unit having a rectifying rectifying unit and a sensing unit sensing an AC voltage of the power terminal unit, and a predetermined period of the first pulse signal generated according to the comparison result by comparing the sensing voltage of the phase voltage sensing unit with a reference voltage A plurality of switching elements connected to an output terminal of the rectifying unit and a driving unit for generating a data signal every time, comparing the data signal with a control signal provided from the outside, and outputting a switching signal according to the comparison result; The switching element of the switching unit for switching operation according to the switching signal of the drive unit, and the return It includes a light emitting unit consisting of a plurality of LEDs respectively connected between the number of switching elements and the ground and driven by the rectified voltage of the rectifying unit in accordance with the on / off operation of the switching element.

AC drive LED, color implementation, emotional lighting

Description

LED lighting device {ILLUMINATION APPARATUS USING IGHTING EMITTING DIODE}

The present invention relates to an LED lighting apparatus, and more particularly, to the LED lighting apparatus capable of color color adjustment and brightness control and increasing efficiency by selectively driving red, green, and blue LEDs.

In general, LED is a two-pole device that emits light only when a current passes, and because of its characteristics such as fast response speed, low power consumption, and semi-permanent lifespan, the backlight of LEDs, LED traffic signals, LED lights, etc. It is used in various fields.

In this regard, as a method of driving a conventional LED, a method of driving an LED by a constant current or constant voltage driver after AC / DC conversion and DC / DC conversion by constant voltage driving and constant current driving has been widely used.

However, the system or device for driving the LED in the constant current or constant voltage method after the AC / DC conversion and DC / DC conversion has a problem in that the cost and volume of the LED device are increased due to the use of a driver.

In order to solve this problem, conventionally, a method of directly driving an LED using an AC commercial power source of 110V or 220V has been proposed.

However, since the AC driving method drives the LED only in a specific voltage range, it is less efficient than the constant voltage and constant current driving methods, and color conversion or dimming, that is, brightness control is not easy, and thus it does not correspond to the emotional lighting device. .

The present invention has been made to improve the above problems, the object of the present invention is to provide a LED lighting device that is capable of color color control and brightness control and improve the efficiency by selectively driving red, green, and blue LEDs.

LED lighting device according to the present invention for achieving the above object is a voltage rectification having a power supply terminal unit to which an AC voltage is applied, a rectifying unit for rectifying the AC voltage of the power terminal unit and a sensing unit for sensing the AC voltage of the power terminal unit; Compares the sensing voltage of the voltage sensing unit and the sensing voltage of the phase voltage sensing unit with a reference voltage to generate a data signal at a predetermined period of the first pulse signal generated according to the comparison result, and compares the data signal with a control signal provided from the outside. A driving unit for outputting a switching signal according to a comparison result, a plurality of switching elements connected in parallel with an output terminal of the rectifying unit, and the plurality of switching elements switch in accordance with a switching signal of the driving unit, and the On / off operation of the switching element connected respectively between a plurality of switching elements and the ground Depending includes a light emitting portion including a plurality of LED which is driven by the rectified voltage of the rectification part.

As a result of the above configuration, the present invention can be used to adjust the color and brightness, and to increase the efficiency such as power reduction by selectively driving the red, green, blue LEDs.

 Hereinafter, the configuration will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an LED lighting apparatus according to the present invention, Figure 2 is a detailed configuration diagram according to the first embodiment of the driving unit of Figure 1, Figure 3 is a detailed configuration diagram showing the switching controller of FIG. 4 is a view showing the switching element in detail.

As shown in FIGS. 1 to 4, the LED lighting apparatus according to the present invention includes a power supply terminal unit 100 to which an AC voltage is applied, and a rectifying unit 111 to rectify an AC voltage applied to the power terminal unit 100. The voltage rectification and voltage sensing unit 110 having the sensing unit 112 for sensing the AC voltage of the power terminal unit 100 and the voltage sensed by the sensing unit 112 are compared with the reference voltage Vref. Generate a first pulse signal according to the comparison result and convert the counting signal generated by counting repeatedly every one period to a data signal, and compares the data signal with a control signal provided from the outside to generate a switching signal according to the comparison result And a plurality of switching elements connected in parallel to the output terminal of the rectifying unit 111 to output the switch 120 and the plurality of switching elements are switched according to the switching signal of the driving unit 120. At least two connected between the operating switching unit 130 and the plurality of switching elements and ground (or an output terminal of the rectifying unit), respectively, and driven by the rectified voltage of the rectifying unit 111 according to an on / off operation of the switching element. It is configured to include a light emitting unit 140 consisting of LEDs consisting of four groups.

Here, 100V or 220V commercial power is applied through the power terminal unit 100.

In addition, the voltage rectification and voltage sensing unit 110 is a kind of bridge rectifier circuit formed by connecting four diodes in a bridge form, and the first and second terminals are connected in series between both ends of the power terminal unit 100 to form a first group. It consists of a second diode (D1, D2), and a third diode (D3), a sensing resistor (Rs) and a fourth diode (D4) which is connected in series at both ends of the power terminal portion 100 to form a second group. have. As a result, the first group consisting of the first and second diodes D1 and D2 and the second group consisting of the third diode D3, the sensing resistor Rs and the fourth diode D4 are connected in parallel. . At this time, the anode electrodes of the first and second diodes D1 and D2 are electrically connected to each other, and the cathode electrodes of the third and fourth diodes D3 and D4 are electrically connected to each other via the sensing resistor Rs. It is becoming.

More precisely, a first diode D1 having a cathode terminal connected to one terminal of the power terminal unit 100, a cathode terminal connected to the other terminal of the power terminal unit 100, and an anode terminal connected to the first diode D1. A second diode D2 connected to an anode terminal of the third terminal; a third diode D3 connected to an anode terminal of one terminal of the power supply terminal unit 100; and an anode terminal of the other terminal of the power terminal unit 100. And a sensing resistor Rs connected between the cathode of the fourth diode D4 and the cathode terminal of the third diode D3.

As shown in FIG. 2, the driver 120 receives the voltage V _Rs across the sensing resistor Rs of the voltage rectifying and voltage sensing unit 100, and the voltage across the driving unit 120 is a reference voltage, for example, OV. A comparator 121 for comparing a voltage greater than or less than a voltage and outputting a signal according to the result of the comparison, an oscillator 123 for generating a pulse signal, and one cycle T of the output signal provided by the comparator 121. A counter 125 for performing a reset and counting and outputting the number of pulses of the signal output from the oscillator 123 during the period, and a counting signal of the counter 125 as a data signal, for example, an analog voltage. And a switching controller 127 for converting and comparing the data signal with a control signal provided from the outside and outputting a switching signal according to the comparison result.

Here, when the AC voltage of the power supply terminal unit 100 is positive, the comparator 121 flows in the forward direction of the third diode D3 connected in series with the resistor, so that the voltage measured at the sensing resistor Rs is (+). When the voltage comes out and the reference voltage referenced by the comparator 121 is set to 0 V, the output of the comparator 121 becomes a high level, and the third diode when the AC voltage of the power supply terminal unit 100 is (−). (D3) is the reverse direction, but there is a leakage current, the direction of the current is reversed, the negative voltage comes out from the sensing resistor (Rs), the output of the comparator 121 is a low-level. Thus, the period of the first pulse signal generated in the comparator 121 is the same 60Hz as the period of the input AC signal and the counter 125 can be initialized once in one period (1/60 second). If the reverse leakage current of the third diode D3 is small and the voltage applied to the sensing resistor Rs at a negative voltage is difficult to be compared with 0V, the reference voltage may be increased to about 0.5V. This may be possible, for example, by adjusting the resistance of the voltage divider resistor connected in series between the operating power supply and ground.

The oscillator 123 may be a variety of square wave generators, such as an oscillator, but the frequency of the second pulse signal is preferably set to 30 times or more than the frequency of the input AC signal, and the number of bits thereof is log ₂ (oscillator frequency). / AC signal frequency). For example, if the frequency of the AC input is 60 Hz and the oscillator frequency is 3600 Hz, 6-bit data can be generated.

Therefore, it may be more preferable that the counter 125 of the present invention is designed to count 6 or more bits of data. That is, the counter 125 may be designed as a 64-bit counter to count 6 bit data. As a result, the counter 125 performs 64-bit counting, resets, and repeats 64-bit counting periodically for a period (or time) corresponding to one cycle of the AC input frequency. will be. Of course, the counter 125 here is preferably an edge triggered counter that counts the rising or falling edge of the pulse.

In the present invention, the counting signal of the counter 125 may be substantially composed of 6-bit data to be divided into red (R), green (G), and blue (B) sections. For example, if a red turn-on voltage is set in the first pulse signal corresponding to the 6-bit data "000001" in the 64-bit counter counting the rising edge of the pulse, the third pulse signal corresponding to the 6-bit data "000011". The turn-off voltage of red may be set and the green turn-on voltage is set in the fourth pulse signal corresponding to "000100", and the green turn-off voltage in the sixth pulse signal corresponding to "000110" is set. The off voltage can be set. Of course, the blue turn-on voltage may be set in the seventh pulse signal corresponding to the 6-bit data “000111”, and the blue turn-off voltage may be set in the ninth pulse signal corresponding to “001000”.

In addition, the first to third switching controllers of the switching controller 127 select and output at least one counting signal from the counting signals provided from the counter 125 to red, green, and blue colors of the light emitting unit 140. A switching signal for turning on and off the switching elements managing the LEDs may be generated and output, respectively. More precisely, the first to third switching controllers constituting the switching controller 127 of the present invention are based on the number of R, G, B LEDs constituting the light emitting unit 140 and the brightness of the R, G, B LEDs according to the brightness signal. The timing of the turn-on voltage and the turn-off voltage can be determined, and the switching signal is output in synchronization with the timing signal (or control signal).

That is, the turn-on voltage of the R, G, and B LEDs emitted during one period of the AC input signal depends on the number of LEDs of the R, G, and B constituting the light emitting unit 140, that is, how many LEDs are connected in series. The turn-off voltage of the R, G, and B LEDs may vary depending on the brightness signal of the LEDs, that is, the dimming signal. In the case of the red LED, in the normal case, the first counting signal, that is, the first pulse signal is turned on and the second pulse signal is turned off according to the initial setting. However, if a dimming signal is provided from the outside, it may be further driven (or emitted) for one pulse period and then turned off in the third pulse signal.

Therefore, the first to third switching controller of the present invention is as shown in FIG. A data converter 127a for converting the counting signal of the counter 125 into a 6-bit data signal (or an analog signal voltage), a data signal provided from the data converter 127a, and a red (R) provided externally. And a plurality of sub comparators for comparing the control signals (or timing signals) of the turn-on and turn-off voltages of the LEDs of green (G) and blue (B) and outputting signals according to the comparison result ( 127b) and a high signal when a high-level signal is input from the sub comparator 127b to a set terminal and a low signal when a high-level signal is input to a reset terminal. The flip-flop 127c for outputting and the level converter 127d for leveling up the signal output from the flip-flop 127c may be configured. At this time, the level converter 127d comprises a simple OP amplifier or a voltage level shifter to level up or amplify a pulse of about 1.5 to 5 V output through the flip-flop 127c to the driving voltage of the switching unit 130. Will be

On the other hand, the switching unit 130 is composed of a plurality of switching elements are connected in parallel to each other, each switching element is configured to manage each of the LEDs of R, G, B having the same color with each other. For example, as shown in FIG. 4, when the FET is configured as a switching element, the source and drain terminals are formed by first and second diodes D1 and D2 connected to each other in the voltage rectifying and voltage sensing unit 110. It is connected to one node N1 and the cathode terminals of the R, G, and B LEDs, respectively. Of course, the gate terminal is connected to the output terminal of the driver 120.

In this case, the on / off timing of the switching elements is preferably set to be turned on / off once every 1/4 period of the AC input frequency. In other words, the LEDs of the R, G, and B groups are each turned on four times and then turned off during one period of the AC input frequency. This allows LEDs to be driven by limiting the use of power for hours other than the time of driving the LEDs by pulses under optimal driving conditions, thereby increasing energy efficiency by reducing consumption factors such as power consumption or voltage consumption. . Of course, the optimal driving condition here means a driving state such that people do not visually blink when the LEDs of the light emitting unit 140 are turned on. Therefore, if the AC input frequency is 60Hz and the LEDs are turned on / off four times during one period, the R, G, and B LEDs will have the same effect as driving at 240Hz.

The light emitting unit 140 includes R, G, and B LEDs in which a plurality of LEDs are connected to each other in the same color. In this case, each of the R, G, and B LEDs connected in series with each other is connected to one terminal of a switching element of which a cathode terminal forms the switching unit 130, for example, a FET, and an anode terminal is connected to the voltage rectification and voltage sensing. In the unit 110, the sensing resistor Rs and the fourth diode are connected to the second node N2 formed by being connected to each other.

In this case, the voltage across the red LEDs forming the first column, the green LEDs forming the second column, and the blue LEDs forming the third column is different from the AC voltage in the light emitting unit 140. It is preferably configured to be operable. In other words, if five red LEDs are configured in series and the voltage at both ends thereof is driven at approximately 80 V, the five green LEDs and the blue LEDs are configured in series and the voltages across the two LEDs may be It must be driven.

Therefore, in order to drive the LEDs of R, G, and B in different sections of the AC voltage, the LEDs do not have to be configured in the same number. For example, by configuring the same number, the color of G is visually brighter. In this case, it may be possible to reduce the number of LEDs of G.

In addition, in order to allow the LEDs of R, G, and B, which constitute the first to third columns, to be turned on simultaneously in the same voltage range, the red LEDs of the first column connect ten in series, and the second column. The green LEDs forming the light emitting unit 140 may be connected in series to the six LEDs, and the blue LEDs forming the third column may be connected to the three LEDs in series.

Furthermore, the light emitting unit 140 includes first and second columns of red LEDs, third and fourth columns of green LEDs, and fifth and sixth columns of blue LEDs. You may.

Therefore, since the first and second columns may be configured as red LEDs, the third column as green LEDs, and the fourth column as blue LEDs, the method of configuring such LEDs may be changed. It will not be limited.

Hereinafter, the operation method of the configuration will be briefly described with reference to FIGS. 1 to 3.

When an AC voltage is applied through the power supply terminal unit 100, the AC voltage is full-wave rectified through the rectifying unit 111 of the voltage rectifying and voltage sensing unit 110, but not necessarily limited to full-wave rectification. The applied voltage is applied to both ends of the LEDs forming the first to third columns in the light emitting unit 140. More precisely, one terminal of the switching unit 130 and one terminal of the LEDs constituting the light emitting unit 140 is applied.

In addition, the driving unit 120 is a rectangular pulse having the same frequency as the AC voltage applied to the power supply terminal unit 100 through the voltage or current sensed through the voltage rectifying and sensing unit 112 of the voltage sensing unit 110, that is, The first pulse signal is generated, and the counter 125 of the driver 120 is initialized every one cycle by the first pulse signal.

In this case, the counter 125 uses a second pulse signal from the oscillator 123 which is generated and provided during a period corresponding to one period of the first pulse signal, that is, a rectangular pulse, for initialization.

In addition, the first to third switching controllers constituting the switching controller 127 of the driver 120 converts the data using a counting signal generated and provided for one period from the counter 125 and provided from the data converted signal and externally. The control signal is compared and a new switching signal is generated and output according to the comparison result.

The switching elements of the switching unit 130 are driven according to the switching signals provided through the first to third switching controllers constituting the switching controller 127 of the driving unit 120.

As such, when the switching element of the switching unit 130 is turned on, the LEDs of the first to third rows constituting the light emitting unit 140 may be selectively driven or simultaneously driven in a specific row of LEDs.

For example, the light emitting unit 140 emits red when the first row of LEDs that are red are driven, and the light emitting unit 140 has the colors R, G, and B when the first to third rows of LEDs are simultaneously driven. The resulting mixture will form white.

Through such a driving method, the light emitting unit 140 according to the present invention can provide light of various colors. For example, when only the red LEDs of the first column and the blue LEDs of the second column are driven at the same time, yellow color is realized.

Furthermore, the present invention can control the brightness of a particular color when the LEDs in one of the LEDs in the first to third rows are driven, for example by adjusting the duty ratio of the dimming signal, as well as in the first to third rows. By driving the LEDs simultaneously, the brightness of white can be adjusted by adjusting the duty ratio of the dimming signal.

Such driving is already mentioned above, but may vary depending on how the LEDs constituting the initial light emitting unit 140 are designed.

For example, assuming that the voltage across the 10 LEDs forming the first column is 110V for the red implementation, the number of blue LEDs in the second and third columns implementing green is determined by driving the same voltage range. White connection may be possible by connecting in series.

In this case, the switching signals provided from the first to third switching controllers constituting the switching controller 127 of the driver 120 may vary depending on how the number of such LEDs is designed.

In other words, if the turn-on timing of the LEDs in the first to third rows is determined according to the number of LEDs, the turn-off timing of the LEDs in the first to third rows is determined by the first of the driving unit 120. To the third switching controller may be determined according to the duty signal (or dimming signal) provided to the third switching controller.

That is, when the LEDs in the first column to implement red are driven, the brightness of the red may be adjusted by delaying the turn-on period of the LEDs by the duty signal (or control signal).

In this regard, as described above, for example, in the normal case, the LEDs in the first column are designed to be turned on at the first counting signal and to be turned off at the second counting signal, but the duty signal, that is, the control signal is provided when The LEDs in the first column may be turned on in the first counting signal and turned off in the third counting signal.

On the other hand, in addition to the first embodiment described above, the LED lighting device of the present invention is to be configured to be operated according to a more precise timing.

In practice, it is difficult to design the frequency of the oscillator exactly in one cycle of the AC input signal in the first embodiment, and in some cases, various fluctuation factors may occur.

5 is a view showing a driving unit of the LED lighting apparatus according to the second embodiment of the present invention.

In the LED lighting apparatus according to the second embodiment of the present invention, as in the first embodiment, the overall configuration includes a power terminal unit to which an AC voltage is applied, a rectifying unit rectifying the AC voltage of the power terminal unit, and an AC voltage of the power terminal unit. The voltage rectification and voltage sensing unit having a sensing unit for sensing, the voltage sensed by the sensing unit is compared with the reference voltage (Vref) to generate a first pulse signal according to the result of the comparison and counted iteratively every cycle A driving unit 220 converting a counting signal into a data signal, comparing the data signal with a control signal provided from the outside, and outputting a switching signal according to the comparison result, and a plurality of switching elements connected in parallel to the output terminal of the rectifying unit; And a plurality of switching elements including: a switching unit configured to perform a switching operation according to the switching signal of the driving unit 220, and And a light emitting unit including at least two groups of LEDs respectively connected between the plurality of switching elements and ground (or an output terminal of the rectifying unit) and driven by the rectified voltage of the rectifying unit according to on / off operation of the switching element. Consists of.

Here, as shown in FIG. 5, the driving unit 220 receives the voltage V _Rs across the sensing resistor Rs of the voltage rectifying unit and the voltage sensing unit, and whether the voltage of the driving unit 220 is greater than the reference voltage of the reference voltage, for example, OV. Alternatively, the frequency of the first pulse signal provided by the comparator 221 and the oscillator 223 for generating the second pulse signal and the comparator 221 are compared. A frequency doubler 224 that doubles and resets the output signal of the frequency doubler 224 every period T, and the signal output from the oscillator 223 for one period of time is reset. A counter 225 for counting and outputting the number of pulses, and a data conversion of the counting signal of the counter 225, comparing the converted data signal with a control signal provided from the outside, and generating and outputting a switching signal according to the comparison result It consists of the first to third switching controller of the switching controller 227. At this time, the frequency of the oscillator 223 is preferably set to more than 15 times the frequency of the AC input signal.

Except that the driving unit 220 is configured as described above, since the second embodiment of the present invention is not significantly different from the LED lighting device according to the first embodiment, other details will be replaced by the above contents.

As a result, the LED lighting apparatus according to the second embodiment of the present invention results in initializing the counter 225 every half cycle (1 / 2T) of the first embodiment.

Therefore, the LED lighting apparatus according to the second embodiment initializes the counter 225 every half cycle (1 / 2T) (relative to the AC input voltage) compared to the LED lighting apparatus according to the first embodiment, so that the frequency of the oscillator is AC. The error incurred by designing exactly one period of the input signal can be halved by that amount, and other variations can be significantly reduced.

Of course, in the second embodiment of the present invention, the frequency doubler 224 has been described as an example. However, the present invention is not particularly limited thereto, and it may be possible to configure the frequency multiplier using various types of frequency multipliers.

6 is a view showing an LED lighting apparatus according to a third embodiment of the present invention.

LED lighting apparatus according to the third embodiment of the present invention voltage rectification and voltage sensing having a power terminal unit to which an AC voltage is applied, a rectifying unit for rectifying the AC voltage of the power terminal unit and a sensing unit for sensing the AC voltage of the power terminal unit And a voltage generated by the sensing unit by comparing the voltage sensed by the sensing unit with a reference voltage (Vref) to generate a first pulse signal according to the comparison result, and repeatedly counting the counting signal generated by repeating counting every half cycle and converting the converted data. A plurality of switching elements including a driving unit 320 which compares a signal with a control signal provided from the outside and generates and outputs a switching signal according to the comparison result, and a plurality of switching elements connected in parallel to an output terminal of the rectifying unit and formed in parallel; Is a switching unit that switches according to the switching signal of the driving unit 320, and the plurality of switching elements and ground (or And a light emitting unit comprising at least two groups of LEDs each connected between the output terminals of the rectifying unit and driven by the rectifying voltage of the rectifying unit according to the on / off operation of the switching element.

At this time, the driving unit 320 receives the voltage across the sensing resistor (Rs) of the voltage rectification and voltage sensing unit as shown in FIG. 6 and compares whether the voltage between both ends is greater than or less than the reference voltage of the reference voltage, for example, OV. A half period (1 / 2T) of the comparator 321 for outputting the first pulse signal according to the comparison result, the oscillator 323 for generating the second pulse signal, and the first pulse signal provided by the comparator 321. A counter 325 for performing initialization and counting the number of pulses of the second pulse signal output from the oscillator 323 during the half period, and converting the counting signal of the counter 325 into data. And a switching controller 327 which compares the converted data signal with a control signal provided from the outside and generates and outputs a switching signal according to the comparison result. At this time, the frequency of the oscillator 323 is preferably set to more than 15 times the frequency of the AC input signal.

Here, the counter 325 triggers an up / down edge of the output signal provided from the comparator 321 and initializes the counter 325 according to the down edge.

Therefore, the counter 325 according to the present invention, in addition to the function of counting the number of pulses of the signal output from the oscillator 323, the up / down of the output signal provided from the comparator 321 at the reset terminal of the counter 325 An up / down trigger reset circuit 325a may be additionally configured to trigger an edge and initialize the counter 325 according to its down edge.

Except for the driving unit 320 and more precisely the counter 325 configured as described above, since the third embodiment of the present invention is not significantly different from the LED lighting device according to the first embodiment, other details are described above. To replace

As a result of the above configuration, the LED lighting apparatus according to the third embodiment of the present invention can initialize the counter 325 every half cycle (1 / 2T) (compared to the AC input frequency) compared with the first embodiment. This reduces the error caused by designing the frequency of the oscillator's second pulse signal exactly to one period of the AC input signal, and significantly reduces other errors due to other fluctuations. will be.

Furthermore, the present invention is not the oscillator and the counter to reduce the error caused by designing the frequency of the second pulse signal of the oscillator exactly one cycle of the AC input signal as in the first to third embodiments. For example, it may be composed of a retarder such as an inverter and a drive signal generator that determines whether the level of the signal provided from the retarder matches the level of the signal provided from the outside.

7 is a view showing a driving unit of the LED lighting apparatus according to a fourth embodiment of the present invention, Figure 8 is a view showing a detailed configuration of FIG.

LED lighting apparatus according to the fourth embodiment of the present invention voltage rectification and voltage sensing having a power terminal unit to which an AC voltage is applied, a rectifying unit for rectifying the AC voltage of the power terminal unit and a sensing unit for sensing the AC voltage of the power terminal unit And an edge signal (or a data signal) of the delayed signal which generates a first pulse signal according to the comparison result by comparing the voltage sensed by the sensing unit with a reference voltage Vref, and delays the first pulse signal. A driving unit 420 which compares a signal provided from the outside, generates and outputs a switching signal according to a comparison result, and a plurality of switching elements connected in parallel to an output terminal of the rectifying unit and formed in parallel; A switching unit which switches according to the switching signal of 420, and is connected between the plurality of switching elements and ground (or an output terminal of the rectifying unit), respectively. And it has in accordance with the on / off operations of the switching elements is configured by including a light-emitting consisting of at least 2 LED made of a single group which is driven by the rectified voltage of the rectification part.

7 and 8, the driving unit 420 receives a voltage across the sensing resistor Rs of the voltage rectifying unit and the voltage sensing unit, and the voltage across the driving unit 420 is greater than the reference voltage of the reference voltage, for example, OV. The comparator 421 for outputting a first pulse signal according to the comparison result and the inverters 423a to 423n for delaying the first pulse signal provided by the comparator 421 to generate a delay signal. And a plurality of multiplexers 425a to 425c configured to compare an edge signal of the delay signal provided from the delayer, that is, a data signal and a control signal provided from the outside, and output a switching signal according to the comparison result. The first to third level converters include a driving signal generator 425 and a level converter 427 for amplifying and outputting a switching signal of the driving signal generator 425. At this time, the inverters 423a to 423n configured in series may additionally configure a white LED 424 between one side terminal and the ground.

Here, the retarder uses the first pulse signal generated by the comparator 421 as an input of the first inverter 423a of the plurality of inverters 423a to 423n having a constant propagation delay connected in series to the rising edge or the falling edge of the pulse. It is desirable to design the number and propagation delays so that the edges take half a period of the input AC signal to reach the last white LED 424.

In addition, the driving signal generator 425 may provide the driving signal generator 425 with the rising and falling edge signals that are leveled up or downed between the inverters 423a to 423n.

The driving signal generator 425 determines whether the transmission delay signal provided from the plurality of inverters 423a to 423n, that is, the data signal and the control signal (or the level of the control signal) provided from the outside coincide with each other, and then matches the level converter ( Provide an on or off signal.

In this case, the first to third level converters of the level converter 127 amplify and output the switching signal of the driving signal generator 425 to drive the switching elements of the switching unit.

Here, the control signal provided from the outside means a signal in which the on / off timing of the switching elements is set as described above, and the on timing of the switching element may be adjusted according to the number of LEDs constituting the light emitting unit. The off timing may be adjusted according to the control of the dimming signal for adjusting the brightness of the LEDs.

For example, by adjusting the delay time of the inverter, it generates 20 edge signals during the half cycle of the AC input signal. When the first edge comes out, "00001", the second "00010", the third "00011", the fourth " 00100, ..........., logic circuit can be configured so that the 20th is "10100".

At this time, turn-on signal (turn-on signal) according to the number of LED and turn-off signal (turn-off signal) according to the dimming signal is set to compare the data generated by the edge of the inverter signal to drive the LED It is possible to generate pulses, that is, switching signals.

Of course, the same as before, the on / off signals transmitted from the driving signal generator 425 to the first to third level converters constituting the level converter 427 in one cycle of the AC input signal are four times each and eventually emit light. Negative LEDs can be driven at a frequency of 240 Hz.

Other details except for this part are not greatly different from the first to third embodiments described above and will be replaced by the contents.

As described above, the present invention may be substituted, modified, and changed in various forms by those skilled in the art without departing from the technical spirit of the present invention.

Accordingly, the scope of the present invention should not be limited by the above-described embodiment and the accompanying drawings, but should be defined by the claims described below.

1 is a block diagram of an LED lighting apparatus according to the present invention

FIG. 2 is a detailed configuration diagram of a first embodiment of the driving unit of FIG. 1.

3 is a detailed configuration diagram illustrating the switching controller of FIG. 2.

4 is a view showing in detail a switching element;

5 is a view according to a second embodiment of the driving unit shown in FIG.

6 is a view according to a third embodiment of the driving unit shown in FIG.

7 is a view according to a fourth embodiment of the driving unit shown in FIG.

8 is a diagram showing a detailed configuration of FIG.

** Description of the symbols for the main parts of the drawings **

100: power terminal 110: voltage rectification and voltage sensing unit

120, 220, 320, 420, driver 130: switching unit

140: light emitting unit

Claims (15)

A power supply terminal unit to which an AC voltage is applied; A voltage rectifying and voltage sensing unit having a rectifying unit rectifying the AC voltage of the power terminal unit and a sensing unit sensing the AC voltage of the power terminal unit; Compares the sensing voltage of the sensing unit with a reference voltage and generates a data signal at a predetermined period of the first pulse signal generated according to the comparison result, and compares the data signal with a control signal provided from the outside to switch according to the comparison result. A driver for outputting a signal; A plurality of switching elements connected in parallel to an output terminal of the rectifying unit and configured to be connected in parallel, the plurality of switching elements including: a switching unit configured to perform a switching operation according to a switching signal of the driving unit; A light emitting unit connected between the plurality of switching elements and the ground, respectively, the light emitting unit including a plurality of LEDs driven by the rectified voltage of the rectifying unit according to an on / off operation of the switching element, The driving unit includes: A comparator receiving the voltage across the sensing resistor of the voltage sensing unit and comparing the voltage between the both ends with a reference voltage and outputting a first pulse signal according to the comparison result; An oscillator for generating a second pulse signal; A counter for performing a reset every one period of the first pulse signal provided by the comparator and counting and outputting the number of pulses of the second pulse signal output from the oscillator during the one period; And The switching controller converts the counting signal of the counter into a data signal, compares the data signal with a control signal provided from the outside, and generates and outputs a switching signal according to the comparison result. LED lighting apparatus comprising a. The method of claim 1, wherein the rectifying unit A first diode having a cathode terminal connected to one terminal of the power terminal unit; A second diode having a cathode terminal connected to the other terminal of the power terminal portion and an anode terminal connected to an anode terminal of the first diode; A third diode having an anode terminal connected to one terminal of the power terminal portion; And A fourth diode having an anode terminal connected to the other terminal of the power terminal portion; LED lighting apparatus comprising a. The method of claim 2, wherein the sensing unit And a sensing resistor connected between the cathode terminal of the third diode and the cathode terminal of the fourth diode. delete The method of claim 2, wherein the light emitting portion Red LEDs in a first row connected to one terminal of the switching device by connecting a cathode terminal in series; Green LEDs of a second row connected to one terminal of the switching device by a cathode terminal connected in series; And Three rows of blue LEDs connected in series with a cathode terminal connected to one terminal of the switching device LED lighting apparatus comprising a. The method of claim 5, wherein the anode terminal of the LEDs forming the first to third columns is And the sensing resistor and the cathode terminal of the fourth diode are connected to a second node formed by being connected to each other. The method of claim 5, wherein the switching controller A first switching controller converting the counting signal of the counter into a data signal for driving the red LEDs of the first row and comparing the data signal with a control signal provided from the outside and outputting a first switching signal according to the comparison result; A second switching controller converting the counting signal of the counter into a data signal for driving the green LEDs of the second row and comparing the data signal with a control signal provided from the outside and outputting a second switching signal according to the comparison result; And A third switching controller for converting the counting signal of the counter into a data signal for driving the blue LEDs of the third row and comparing the data signal with a control signal provided from the outside and outputting a third switching signal according to the comparison result LED lighting apparatus comprising a. The method of claim 7, wherein the first to third switching controller is respectively A data converter converting the counting signal of the counter into a data signal; A plurality of sub-comparators for comparing a data signal provided by the data converter with a control signal set externally and outputting a signal based on a match; And A flip-flop that outputs a high signal when a high-level signal is input from the sub-comparator to a set terminal, and outputs a low signal when a high-level signal is input to a reset terminal; And A level converter to convert the signal level of the flip-flop LED lighting apparatus comprising a. The method of claim 5, wherein the plurality of switching elements of the switching unit LED lighting device comprising a FET element. 10. The device of claim 9, wherein the FET device A drain terminal is connected to a first node formed by connecting the first and second diodes of the rectifying unit to each other, The source terminal is connected to the cathode terminal of the R, G, B LEDs constituting the light emitting portion, LED lighting device, characterized in that the gate terminal is connected to the output terminal of the drive unit. A power supply terminal unit to which an AC voltage is applied; A voltage rectifying and voltage sensing unit having a rectifying unit rectifying the AC voltage of the power terminal unit and a sensing unit sensing the AC voltage of the power terminal unit; Compares the sensing voltage of the sensing unit with a reference voltage and generates a data signal at a predetermined period of the first pulse signal generated according to the comparison result, and compares the data signal with a control signal provided from the outside to switch according to the comparison result. A driver for outputting a signal; A plurality of switching elements connected in parallel to an output terminal of the rectifying unit and configured to be connected in parallel, the plurality of switching elements including: a switching unit configured to perform a switching operation according to a switching signal of the driving unit; A light emitting unit connected between the plurality of switching elements and the ground, respectively, the light emitting unit including a plurality of LEDs driven by the rectified voltage of the rectifying unit according to an on / off operation of the switching element, The driving unit includes: A comparator receiving the voltages across the sensing unit and comparing the voltages across the sensing unit with a reference voltage and outputting a first pulse signal according to the comparison result; An oscillator for generating a second pulse signal; A frequency multiplier for increasing the frequency of the first pulse signal provided by the comparator; A counter configured to reset the output signal of the frequency multiplier every one period, and count and output the pulse number of the second pulse signal provided from the oscillator during the one period; And The switching controller converts the counting signal of the counter into a data signal, compares the converted data signal with a control signal provided from the outside, and generates and outputs a switching signal according to the comparison result. LED lighting apparatus comprising a. A power supply terminal unit to which an AC voltage is applied; A voltage rectifying and voltage sensing unit having a rectifying unit rectifying the AC voltage of the power terminal unit and a sensing unit sensing the AC voltage of the power terminal unit; Compares the sensing voltage of the sensing unit with a reference voltage and generates a data signal at a predetermined period of the first pulse signal generated according to the comparison result, and compares the data signal with a control signal provided from the outside to switch according to the comparison result. A driver for outputting a signal; A plurality of switching elements connected in parallel to an output terminal of the rectifying unit and configured to be connected in parallel, the plurality of switching elements including: a switching unit configured to perform a switching operation according to a switching signal of the driving unit; A light emitting unit connected between the plurality of switching elements and the ground, respectively, the light emitting unit including a plurality of LEDs driven by the rectified voltage of the rectifying unit according to an on / off operation of the switching element, The driving unit includes: A comparator receiving the voltages across the sensing unit and comparing the voltages across the sensing unit with a reference voltage and outputting a first pulse signal according to the comparison result; An oscillator for generating a second pulse signal; A counter for performing at least one reset for each period of the first pulse signal provided by the comparator and counting and outputting the number of pulses of the second pulse signal provided from the oscillator during the period; And The switching controller converts the counting signal of the counter into a data signal, compares the converted data signal with a control signal provided from the outside, and generates and outputs a switching signal according to the comparison result. LED lighting apparatus comprising a. The method of claim 11, wherein the counter And an up / down trigger reset circuit for triggering an up / down edge of an output signal provided by the comparator and initializing a counter according to the down edge. A power supply terminal unit to which an AC voltage is applied; A voltage rectifying and voltage sensing unit having a rectifying unit rectifying the AC voltage of the power terminal unit and a sensing unit sensing the AC voltage of the power terminal unit; Compares the sensing voltage of the sensing unit with a reference voltage and generates a data signal at a predetermined period of the first pulse signal generated according to the comparison result, and compares the data signal with a control signal provided from the outside to switch according to the comparison result. A driver for outputting a signal; A plurality of switching elements connected in parallel to an output terminal of the rectifying unit and configured to be connected in parallel, the plurality of switching elements including: a switching unit configured to perform a switching operation according to a switching signal of the driving unit; A light emitting unit connected between the plurality of switching elements and the ground, respectively, the light emitting unit including a plurality of LEDs driven by the rectified voltage of the rectifying unit according to an on / off operation of the switching element, The driving unit A comparator receiving the voltages across the sensing unit and comparing the voltages across the sensing unit with a reference voltage and outputting a first pulse signal according to the comparison result; A delay unit comprising inverters for delaying the first pulse signal provided by the comparator to generate a data signal; A driving signal generator for comparing the data signals provided by the delay unit with the control signals provided from the outside and outputting a switching signal; And At least one level converter for converting and outputting a switching signal of the driving signal generator LED lighting apparatus comprising a. 15. The apparatus of claim 14, wherein the retarder LED lighting device, characterized in that it further comprises a white LED between one terminal of the inverter provided on one side and the ground.

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