KR101062193B1 - Drive device of LED power supply using switch controller - Google Patents

Abstract

An apparatus for driving an LED power supply using the switch controller of the present invention includes: an AC power supply unit 310 for generating an AC voltage or an AC current; A constant current device 320 which receives the AC current and rectifies the DC current with a predetermined magnitude; And an LED (LED) power supply unit 330 including N + 1 (N is a natural number) light emitting diodes D0, D1 .... D _N-1, D _N , wherein the constant current device 320 includes: the light-emitting diode _{(D0, D1 .... D N-} 1, D N) N + 1 (N is a natural number) current source (a _{0, A1,} corresponding to each ..... a _N-1, that the switching of the _N a), the light emitting diode _{(D0, D1 .... D N-} 1, D N) and the constant current source _{(a 0, A1, ..... a} N-1, a N) Provided is a device including a switch group consisting of a plurality of switches and a switch controller 325 for controlling the switches.

An apparatus for driving an LED power supply using the switch controller of the present invention significantly reduces a time interval toff at which a plurality of connected LEDs are turned off, and a time interval relatively turned on. By increasing the), the LED does not become dark for a long time, but has a merit of emitting bright light of a certain size immediately.

LED, lighting, switch controller, constant current device

Description

 LED power driving device using switch controller {LED POWER DRIVING APPARATUS USING SWITCH CONTROLLER}

The present invention relates to a driving device of an LED power supply, and more particularly, to a switch controller in a constant current device to implement a series, parallel, or parallel-parallel mixed connection of a light emitting diode to implement a switch controller of a wide range of turn-on voltages. It relates to a driving device of the used LED power supply.

Recently, it has been developed to use a light emitting diode (hereinafter referred to as "LED") as a luminaire to replace a fluorescent lamp.

LED (LED) injects a minority carrier into the junction surface where the P-type semiconductor, which is the hole of the concept that the electric carrier is opposed to the electron, and the N (N) -type semiconductor, whose carrier is the electron, so that the electron has higher energy level. When the injected electrons and holes are recombined in a stable state after being excited, the excited energy is radiated as an electromagnetic wave having a wavelength band of light to emit light in the visible region or near infrared region.

Recently, LED (LED) has escaped from general purpose products of low brightness by the rapid development of semiconductor technology, and it is possible to produce high brightness and high quality products. In addition, as the implementation of high-performance blue and white diodes becomes a reality, LED (LED) has an application value is expanding.

Figure 1 shows a conventional drive device of the LED power supply.

Referring to FIG. 1, a conventional device for driving an LED power supply 100 includes an AC power supply unit 110 generating an AC voltage or an AC current, an LED power supply unit 130 including a plurality of light emitting diodes, and an AC current. It is provided with a constant current device 140 for rectifying a direct current of a constant size.

However, since the conventional constant current device 140 does not have a switch controller therein, a predetermined series connection (see FIG. 2A) or a predetermined series / parallel connection method (see FIG. 2B) has already been determined for a plurality of light emitting diodes provided in the LED power supply unit 130. ) Was available only.

As a result, the conventional LED power supply device 100 has a limitation in implementing a light emitting diode connection method having a wide range of turn on voltage, and finally, time to turn on the light emitting diodes. The tons were short. That is, the relatively long time interval (toff) for turning off the light emitting diode (toff) has a problem that the illumination of the LED power supply is dark for a certain time interval (toff) (see Fig. 3).

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a device for driving an LED power supply having a switch controller in a constant current device to implement a series, parallel, or parallel-parallel mixed connection of a light emitting diode to realize a wide range of turn-on voltages. .

An apparatus for driving an LED power supply using a switch controller according to the present invention for achieving the above technical problem includes an AC power supply unit 310 for generating an AC voltage or an AC current; A constant current device 320 which receives the AC current and rectifies the DC current with a predetermined magnitude; And an LED (LED) power supply unit 330 including N + 1 (N is a natural number) light emitting diodes D0, D1 .... D _N-1, D _N , wherein the constant current device 320 includes: the light-emitting diode _{(D0, D1 .... D N-} 1, D N) N + 1 (N is a natural number) current source (a _{0, A1,} corresponding to each ..... a _N-1, that the switching of the _N a), the light emitting diode _{(D0, D1 .... D N-} 1, D N) and the constant current source _{(a 0, A1, ..... a} N-1, a N) Provided is a device including a switch group consisting of a plurality of switches and a switch controller 325 for controlling the switches.

According to the present invention, the LED power is darkened for a long time by significantly reducing the time interval (toff) at which the plurality of connected LEDs are turned off, and increasing the time interval (T) which is relatively turned on. It has the advantage of emitting a bright light of a certain size immediately.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 4 shows a driving device of the LED (LED) power supply using the switch controller of the present invention.

Referring to FIG. 4, the driving device 300 of an LED (LED) power supply using the switch controller of the present invention includes an AC power supply unit 310 and a constant current device 320 including an AC generator 313 and a rectifier 315. And an LED (LED) power supply unit 330.

The AC generator 313 generates a sine wave to a power supply terminal having a 220 V voltage and a 60 Hz frequency as externally supplied power, and the rectifier 315 uses a bridge circuit to invert the sine wave to a half wave of the anode. The AC voltage or AC current rectified by the half wave is input to the constant current device 320.

The constant current device 320 rectifies the half wave AC voltage or the half wave AC current input through the rectifier 315 into a DC current Id having a predetermined magnitude and inputs the same to the LED power supply unit 330.

 The LED power supply unit 330 may include a plurality of light emitting diodes, and may be connected in series or in parallel by the switch controller 315 provided in the constant current device 320. The light emitting diode may emit light of any one or more wavelengths of red (R), green (G), and blue (B), thereby realizing multicolored lighting suitable for a use environment.

5 is a detailed view of a switch and a switch controller constituting the constant current device of the present invention.

Referring to FIG. 5, the constant current device 320 includes an AC power supply 310 and each of N + 1 light emitting diodes D0, D1... D _N-1, D _N. N + 1 first switch group (psw0, psw1 ... psw _N-1 , psw _N ), N + 1 light emitting diodes (D1, D2 .... D _N-1, D _N ) N + 1 second switch groups nsw0, nsw1 ... nsw _N-1 , nsw switching between constant current sources A _0, A1, ..... A _N-1, A _N corresponding to each of them _N ) and a third switch group tsw0, tsw1 ... tsw _N-1 switching between neighbors of N + 1 light emitting diodes D0, D1... D _N-1, D _N.

In addition, the constant current device 320 includes N + 1 first switch groups (psw0, psw1 ... psw _N-1 , psw _N ), and N + 1 second switch groups (nsw0, nsw1 ... nsw _N-1 , nsw _N ) and a switch controller 325 for controlling each of the _N third switch groups tsw0, tsw1..., tsw _N-1 .

Less than or equal to the first switch group _{(psw0, psw1 ... psw N-} 1, psw N), the second switch group (nsw0, nsw1 nsw ... _{N-1, N} nsw) and the third switch group (tsw0, tsw1 ... a method of connecting N + 1 light emitting diodes in series, parallel or series-parallel mixing by the switching operation of tsw _N-1 ).

First, when all N + 1 LEDs (D0, D1 .... D _N-1, D _N ) are connected in series, psw0 is turned on, nsw0 is turned off, tsw0 Is turn on, psw1 is turn off ..... nsw _{N - 1} is turn off, tsw _{N -1} is turn on, psw _N Is turn off, nsw _N Can be turned on.

In this case, if the threshold voltage required to turn on one light emitting diode is called Vth, and a plurality of light emitting diodes have the same Vth, all N + 1 series connected light emitting diodes The total turn-on voltage V _{T required to} turn on is (N + 1) × Vth.

Second N + 1 (Natural) LEDs (D0, D1 .... D _{N -1,} D _N Psw0 turns on, nsw0 turns on, tsw0 turns off, psw1 turns on, ..... nsw _{N -1} is when turned on _{(turn on), tsw N-} 1 is turned oFF (turn off), psw _N is turned on (turn on), nsw _N is turned on (turn on).

In this case, if the threshold voltage required to turn on one light emitting diode is called Vth, and a plurality of light emitting diodes have the same Vth, in this case, N + 1 parallel-connected light emission. The total turn on voltage (V _T ) required to turn on the entire diode is Vth.

By applying the first and the second connection method, it is possible to freely implement a series, parallel, series-parallel mixed connection method, and the user can set the minimum threshold voltage value (Vth) or more and the maximum threshold voltage value ((N + 1) × Vth) or less. A turn on voltage corresponding to the number of light emitting diodes connected to each other within a voltage range of may be implemented.

6 shows a circuit constituting the switch controller of the present invention.

Referring to FIG. 6, the switch controller 325 of the present invention includes a voltage comparator 520 and a demultiplexer 540.

The voltage comparator 520 fluctuates according to the time generated by the AC power supply 310, and the fluctuation voltage and the N + 1 (natural number) light emitting diodes D0, D1 .... D _N-1, D _N ) Compare the turn-on voltages ( V Vth0, Vth1, ... VthN-1, VthN) that can be implemented by each series, parallel or series-parallel mixed connection, and then compare the data (Vd0, Vd1, .... VdN -1, VdN 533) is transmitted to the demultiplexer 540. Here, the value of the comparison data (Vd0, Vd1, .... VdN-1, VdN) is output as a data value of 0V or 5V depending on the change voltage.

The demultiplexer 540 uses the comparison data Vd0, Vd1, .... VdN-1, VdN 533 transmitted from the voltage comparator 520 as an input signal, and includes a first diode D0 corresponding to a plurality of output lines. The first diode switch (psw0, nsw0, tsw0, 551) to switch ... The Nth diode switch (pswn-1, nswn-1, tswn-1, 553) to switch the N-th diode (DN-1) ) And the N + 1 th diode switch (pswn, nswn, 555) for switching the N th diode DN.

In this way, the user can use the switch control of the demultiplexer 540 for each of the N + 1 light emitting diodes D0, D1... D _N-1, D _N in series, as described in FIG. Parallel or serial or parallel mixed connections can be implemented.

If the turn-on voltages for turning on each of the light emitting diodes implemented through the series, parallel, or parallel-parallel mixed connection are Vth0, Vth1, .... VthN-1, VthN, the user may use the minimum threshold value Vth. The turn-on voltage within the range of the abnormal maximum threshold value ((N + 1) x Vth) has a hierarchical value such as Vth0 <Vth1 <, .... <VthN-1 <VthN (see FIG. 8). can do.

FIG. 7 illustrates a half-wave rectified sine wave output from an AC power supply unit of the present invention, and FIG. 8 illustrates a voltage hierarchical of an LED turned on according to a time of a driving device of an LED power supply using the switch controller of the present invention. It is shown as an enemy.

Referring to FIG. 8, the driving device of the LED power source using the switch controller of the present invention has a turn-on voltage such that the turn-on voltage has a hierarchical size such as Vth0 <Vth1 <, .... <VthN-1 <VthN. It can be seen that the turn off time is significantly reduced compared to the conventional technique. In other words, by increasing the turn-on time interval (ton), the brightness of the LED power supply does not dim for a long time can be made to emit a bright light of a certain size immediately.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Figure 1 shows a conventional drive device of the LED power supply.

FIG. 2A illustrates a light emitting diode connected in series to a conventional LED power supply unit. FIG.

Figure 2b shows a light emitting diode connected in series, parallel mixing in the conventional LED power supply.

3 illustrates a voltage at which an LED is turned on according to time in a conventional driving device of an LED power supply.

4 illustrates a driving device of an LED (LED) power supply using the switch controller of the present invention.

5 is a detailed view of a switch and a switch controller constituting the constant current device of the present invention.

6 shows a circuit constituting the switch controller of the present invention.

7 illustrates a half-wave rectified sine wave output from the AC power supply unit of the present invention.

 8 is a hierarchical display of a voltage at which an LED is turned on over time of an LED (LED) driving device using a switch controller of the present invention.

Claims (10)

In the drive device of the LED (LED) power supply, An AC power supply unit generating AC voltage or AC current; A constant current device receiving the alternating current to rectify the DC current with a predetermined magnitude; And N + 1 and a LED (LED) power supply including a (N is a natural number) light emitting diode _{(D0, D1 .... D N-} 1, D N), The constant current device The light-emitting diode _{(D0, D1 .... D N-} 1, D N) N + 1 (N is a natural number) current source (A _{0, A1,} corresponding to each ..... A _N-1, that the switching of the _N a), the light emitting diode _{(D0, D1 .... D N-} 1, D N) and the constant current source _{(a 0, A1, ..... a} N-1, a N) A switch group consisting of a plurality of switches and a switch controller for controlling the switch, The switch controller, A voltage comparator and a demultiplexer, The voltage comparison unit, the fluctuation voltage output from the AC power supply and the light emitting diode _{(D0, D1 .... D N-} 1, D N) turn-on voltage that is implemented by each of the serial, parallel or mixed series-parallel connection (Vth0, Vth1, ..., VthN-1, VthN) after comparing the switch controller, characterized in that for transmitting the comparison data (Vd0, Vd1, ..., VdN-1, VdN) to the demultiplexer Drive device of the LED (LED) power provided. The method of claim 1, wherein the switch group, A first switch group (psw0, psw1 ... psw _N-1 , psw _N ) for switching between the AC power supply unit and the light emitting diodes (D0, D1 .... D _N-1, D _N ), the light emitting diode ( D0, D1 .... D _N-1, D _N ) and the second switch group (nsw0, nsw1.) Switching between the constant current source (A _0, A1, ..... A _N-1, A _N ). nsw _N-1 , nsw _N ) and a third switch group (tsw0, tsw1 ... tsw _N-1 ) switching between neighbors of the light emitting diodes D0, D1 .... D _N-1, D _N Driving apparatus of the LED (LED) power supply having a switch controller, characterized in that it comprises a. delete delete The method of claim 1, wherein the comparison data (Vd0, Vd1, .... VdN-1, VdN), An apparatus for driving an LED power supply having a switch controller, which outputs a voltage of 0V or 5V depending on the variable voltage. The method of claim 1, wherein the demultiplexer, Driving of an LED (LED) power source having a switch controller, characterized in that for selecting the switch receives the comparison data (Vd0, Vd1, .... VdN-1, VdN) transmitted from the voltage comparator Device. 7. The driving device of an LED power supply with a switch controller according to claim 6, wherein the demultiplexer switches are selected to implement a series, parallel or series-parallel mixed connection of the light emitting diodes. The method of claim 6, wherein the comparison data (Vd0, Vd1, .... VdN-1, VdN), respectively, When the threshold voltage required to turn on one light emitting diode is defined as Vth, it has data corresponding to a plurality of values within a range of Vth or more (N + 1) × Vth or less. An LED (LED) power supply drive device having a switch controller. The method of claim 1, wherein the AC power supply unit, And a rectifier for rectifying the sinusoidal wave into a half wave, wherein the ac generator generates a sine wave of an ac voltage. The method of claim 1, wherein the light emitting diode,  An apparatus for driving an LED power source, which emits light of any one or more wavelengths of red (R), green (G), and blue (B).

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