KR101376152B1 - Led lighting apparatus - Google Patents

Abstract

The present invention relates to an LED lighting device, and more particularly, in the existing lighting using the wall switch, without dividing wiring and additional configuration, the dimming is made through the turn off-turn on operation of the wall switch, The present invention relates to a multi-level dimmable LED lighting device that can be adjusted in various levels.
The present invention generates a constant current from the rectified DC voltage through the full-wave rectifier 102 to receive the AC power input through the wall switch 98 to the rectified DC voltage to supply to the LED lamp 99, the voltage supply LED light driver 80 that receives power from circuit 90 to measure turn-off time of wall switch 98 and provides multi-level dimming according to turn-off time of off-timer 96 providing dimming level. It characterized in that it is configured to include.

Description

LED lighting device {LED LIGHTING APPARATUS}

The present invention relates to an LED lighting device, and more particularly, in the conventional lighting using the wall switch, without dividing wiring and additional configuration, the dimming is performed using the wall switch off time, and the level of dimming is also varied. The present invention relates to a multi-level dimmable LED lighting device that can be adjusted.

In general, dimming dims'; [Eye, etc.] is blurred [faint] ', and on the luminaire side as part of the luminaire to adjust to the desired brightness of the user, this device is called dimmer do.

This dimming or dimmer is an indispensable technology in recent lighting equipment. (It is used to improve the quality of lighting such as creating a pleasant lighting environment in recent lighting design, eliminating glare, adjusting the illumination to create an atmosphere, and saving energy.) This dimming to dimmer is mainly provided in the ballast to provide the above functions.

The ballast serves to maintain a constant lighting of the lamp by continuously supplying a constant voltage to the lighting device (lamp) to interrupt the discharge of the lamp. That is, since the lamp has a negative voltage-current characteristic, when the initial lamp is turned on, the voltage continuously decreases while the voltage increases, and eventually the lamp is destroyed. A ballast is required to prevent such a phenomenon. After the ballast serves to limit the current by supplying a constant voltage to the lamp.

) 값을 결정한다. R23은 가변저항이다. 사용자는 R23을 변경하여 지연시간을 조절할 수 있다. 이때, 트라이악(25)이 턴온하기 전에는 R23을 거쳐 C24에 충전되는 전류를 제외한 다른 전류는 없다. 이 작은 전류는 백열등에 흐르게 된다. 보통 백열등은 수백옴 정도의 저항 성분으로 되어 있다. 지연시간이 지난 후에는 C24의 전압은 다이악(26)을 도통시키기에 충분히 높은 상태로 되어야 한다. 다이악이 도통되면 트라이악의 GT에 짧은 전류 펄스가 유입되고, 트라이악은 턴온 된다. Conventionally, a dimming circuit of a lamp may be exemplified by a conventional triac dimming circuit used in the incandescent lamp 10 shown in FIG. 1. The dimming circuit 20 is connected between the wall switch 98 of the AC power line. Resistor R23 and capacitor C24 have a delay time after the AC voltage crosses 0V.

) To determine the value. R23 is a variable resistor. The user can adjust the delay time by changing R23. At this time, before the triac 25 turns on, there is no current other than the current charged to C24 via R23. This small current flows through the incandescent lamp. Incandescent lamps are usually made up of hundreds of ohms. After the delay has elapsed, the voltage at C24 must be high enough to allow the diaak 26 to conduct. When the Diac becomes conductive, a short current pulse flows into the Triac's GT, and the Triac is turned on.

In addition, Figure 2 shows some waveforms that are important in a conventional triac dimming circuit. As the delay increases, the conduction angle of the triac decreases. Therefore, the amount of power or current of the incandescent lamp can be controlled. The method of changing the delay time to adjust the available power of the load is called phase control.

However, a lighting apparatus using a triac dimmer such as the conventional dimming circuit 20 does not have a good power factor. For example, when set to very low brightness, the power factor drops below 0.2.

Triac dimmers also generate EMI and noise. That is, EMI filter is generally composed of C21 and L22.

Triac dimmers are also designed to be used to control resistive loads, such as incandescent lamps. If the dimming level is set low while using the triac method, the temperature of the tungsten filament is lowered, causing a reddish light.

Also, triac dimmers are not compatible with most fluorescent lights. In addition, Triac dimmers are not compatible with most LED luminaires. That's because LEDs emit light by flowing forward current, so the light disappears immediately when the current flows off (using some blocking of the AC voltage makes the LED light flicker).

The LED lighting device has advantages such as high brightness, low power consumption, small size, light weight, and long life compared to the existing incandescent lamps or fluorescent lamps, and is spurring efforts to develop and use such LEDs as lighting devices. The demand for this is also increasing steadily.

Therefore, the LED lighting equipment, as in the case of incandescent and fluorescent lamps, requires not only to turn on / off the LED lighting but also a dimming function (shopping mall, shop, school, hospital, office, subway, factory, etc. Requires dimming instead of turning off all lights at the end of work or at night in public places.)

However, the lighting dimmer including the dimming circuit has to be installed separately in the luminaire, which incurs additional costs, and thus, most fluorescent lamps, energy-saving lamps and general LED lamps do not include a dimming device. Since only the function of turning on or turning off the maximum, improvement is required.

The present invention was created to solve the above problems and meet the requirements of the prior art, dimming using the off time of the wall switch, without additional wiring work and additional configuration in the existing lighting using the wall switch To achieve this, and to provide a multi-level dimmable LED lighting device that can also vary the level of dimming.

The present invention for achieving the above object is to generate a constant current from the rectified DC voltage through the full-wave rectifier 102 receives the AC power through the wall switch 98 to supply a rectified DC voltage LED lamp (99) Multi-level dimming according to the turn-off time of the off-timer 96 which measures the turn-off time of the wall switch 98 by receiving power from the voltage supply circuit 90 It is characterized by including the LED lighting driver 80 to provide.

The present invention by the above problem solving means is to make the dimming by using the off time of the wall switch, without additional wiring work and additional configuration in the existing lighting using the wall switch, this dimming function to the switching controller By including it, the effect which enables dimming at low cost is acquired.

1 is a circuit diagram showing the configuration of a conventional triac dimming circuit.
2 is a waveform diagram showing an operating state of a conventional triac dimming circuit.
3 is a circuit block diagram schematically showing a configuration according to an embodiment of the present invention.
4 is a circuit diagram showing in more detail the configuration according to an embodiment of the present invention.
5 is an operating condition table showing the operating conditions of the present invention.
6 is a waveform diagram showing an operating state of the present invention.

The present invention will now be described with reference to the accompanying drawings.

First, the present invention is a constant from the DC voltage rectified through the full-wave rectifier 102 to receive the AC power input to the rectified DC voltage through the wall switch 98, as shown in Figure 3 and 4 of the accompanying drawings Generates a current and supplies it to the LED lamp 99, receives power from the voltage supply circuit 90 to measure the turn-off time of the wall switch 98, and turns off the off-timer 96 to provide a dimming level. It may be configured to include an LED light driver 80 to provide a multi-level dimming over time.

Here, in the present invention, the voltage supply circuit 90 rectifies the AC voltage induced in a transformer formed while the inductor 81 and the bias winding 93 are provided on a common magnetic core while the wall switch 98 is turned on. It may be to supply a DC power supply ripple is removed.

Meanwhile, the LED lighting driver 80 includes an inductor 81 connected to the LED lamp 99; An anode connected to the inductor 81 and a cathode connected to a stage to which a rectified DC voltage is supplied and a reflux diode 82 connected to an LED lamp 99; A power MOSFET 83 connected between the anode of the reflux diode 82 and GND; The multi-level dimming is performed by controlling the duty cycle of the power MOSFET 83 according to the measured off time value of the off-timer 96 while being driven by the VDD1 voltage, which is the output voltage of the voltage supply circuit 90. Providing a switching controller 100; may be configured to include.

In the above, the LED lighting driver 80 may be a flyback, forward structure in addition to the buck structure.

In addition, the power MOSFET 83 may stop the switching operation when the wall switch 98 is turned off. At this time, when the switching operation of the power MOSFET 83 is stopped, the supply of energy to the power capacitor 92 is stopped from the bias winding 93, and accordingly, the voltage of the bias winding 93 is switched to low so that the switching is performed. The controller 100 is shut down and the off-timer 96 operates to measure the turn-off time of the wall switch 98, but the turn-off time for a predetermined time until all of the energy of the power capacitor 92 is discharged. After storing, when the wall switch 98 is turned on again, the off-timer 96 stops measuring time, and the internal regulator 79 operates to refer to the measured off time value of the switching controller 100. The dimming level may be selected from among the preset voltages, and the duty cycle may be changed.

In this case, the switching controller 100 may further receive an EN signal that detects that energy is not introduced from the bias winding 93 when the wall switch 98 is turned off. In addition, the switching controller 100 may further include an internal regulator 79 that receives the EN signal and shuts down the switching controller 100 except for the off-timer 96.

The operation of the present invention, which can be configured as described above, is as follows.

First, the present invention, as described above, has a full-wave rectifier 102, voltage supply circuit 90, LED lamp 99, LED lighting driver 80, wall switch 98.

Here, the full-wave rectifier 102 receives the AC power source 101 through the wall switch 98 to provide a full-wave rectified DC voltage. The voltage supply circuit 90 supplies a VDD1 voltage which is a DC voltage.

On the other hand, the LED lighting driver 80 is operated by receiving the VDD1 voltage which is the output voltage of the voltage supply unit 90, the LED lighting driver 80 generates a current from the rectified DC voltage LED lamp 99 Drive. In the above, the LED lighting driver 80 adjusts the brightness of the LED lamp 99 from various levels corresponding to the measured turn-off time of the wall switch 98.

In this case, the LED lighting driver 80 is an inductor 81, a free-wheeling diode 82, a power MOSFET 83, a current sensing resistor 84, an off-timer 96, and a switching controller 100. It consists of

The inductor 81 is connected to the LED lamp 99, the anode of the flyback diode 82 is connected to the inductor 81, and the cathode is connected to the rectified DC voltage supply terminal and the LED lamp 99. In addition, the power MOSFET 83 is connected to the anode of the inductor 81 and the flyback diode 82. In addition, the current sensing resistor 84 is connected between the source of the power MOSFET 83 and GND.

In addition, the switching controller 100 includes an internal regulator 79, an off-timer 96, a comparator 85, an RS flip-flop 78, a one-shot 87, and a gate driver 86.

In addition, the internal regulator 79 receives the VDD1 voltage output from the voltage supply unit 90 and supplies power (ex, 5V) inside the IC.

In addition, the off-timer 96 operates by receiving the VDD1 voltage output from the voltage supply unit 90, and receives the EN signal to output the VREF voltage.

The comparator 85 also resets the RS flip-flop 78 by comparing the ISEN and VREF voltages.

In addition, the One-Shot 87 periodically sets the RS flip-flow 78.

The gate driver 86 also drives the power MOSFET 83.

At this time, when the power MOSFET 83 is turned on, the voltage applied to the inductor 81 becomes positive, and the current flows through the LED lamp 99 and the inductor 81 while increasing, and is caused by the current sensing resistor 84. When the voltage of the ISEN node is increased to reach Vref, comparator 85 generates a reset signal to turn off power MOSFET 83.

As such, when the power MOSFET 83 is turned off, the voltage applied to the inductor 81 becomes negative since the voltages of the LED lamp 99 and the flyback diode 82 are constant. At this time, the current flowing through the LED lamp 99 and the inductor 81 decreases. In the above, since the power MOSFET 83 switches quickly, the current flowing in the LED lamp 99 is kept constant.

The voltage supply circuit 90 includes a bias winding 93, a rectifying diode 91, a power capacitor 92, and a start-up resistor 95.

In the above, the startup resistor 95 supplies the VDD1 voltage capable of sufficiently driving the power MOSFET 83 at the initial startup.

In addition, the inductor 81 and the bias winding 93 are electromagnetically coupled by a transformer using a common magnetic core. When the power MOSFET 83 switches, AC is connected to the inductor 81. A voltage is generated, which induces an AC voltage in proportion to the bias winding 93, and the rectifying diode 91 rectifies the induced AC voltage.

In addition, the power capacitor 92 filters the ripple of the rectified voltage, resulting in a VDD1 voltage, which is a direct current voltage. As such, when the wall switch 98 is initially turned on, the full-wave rectified voltage VDC charges the power capacitor 92 through the start-up resistor 95. At this time, when the VDD1 voltage reaches a certain voltage, the internal regulator 79 operates to start switching.

At this time, if the wall switch 98 is temporarily turned off, the switching of the power MOSFET 83 is stopped. The bias winding 93 no longer generates an induced current.

Then, the EN signal (Enable signal) output from the power supply unit 90 becomes Low, the internal regulator 79 is shut down, and the off-timer 96 starts to operate. Since the off-timer 96 is implemented as a logic circuit and the power consumption is very small, after the LED lighting driver 80 stops operating, the off-timer 96 maintains the state of the logic circuit with the voltage charged in the power capacitor.

Therefore, if the user maintains a time for turning off the wall switch 98 and turns on again, the dimming level of the LED lamp 99 may be adjusted. That is, if the off-timer 96 exceeds a certain value, the timer is immediately initialized and the dimming level of the LED lamp 99 is reset to the initial state. This time is described as an example, and may vary with time constant.

The off-timer 96 outputs a dimming voltage corresponding to the value of the timer as Vref. As the timer value increases, the dimming voltage decreases.

By the control mechanism of the switching controller 100, the switching controller 100 controls the duty cycle of the power MOSFET to be proportional to Vref. Therefore, when the timer value increases, the LED lighting drier 80 gives a low output.

4 and 5, the off-timer 96 value is initialized to zero when the wall switch 98 is first turned on. In this state, the switching controller 100 drives the dimming level at 100%. Then, when the wall switch 98 is turned off, the off-timer 96 is turned on again within a specified time, the switching duty cycle of the power MOSFET 83 is operated in the corresponding duty cycle. Or if the turn-on-turn is operated at intervals of less than one second, the duty cycle of the power MOSFET 83 is reduced in steps.

However, if the wall switch 98 is turned off for 4 seconds or more, the VDD1 voltage is discharged to a very low voltage so that the offtimer 96 no longer operates. At this time, when the wall switch 98 is turned on again, the off-timer 96 is initialized and the switching controller 100 operates at a 100% duty cycle.

In the present invention, the count is composed of four steps, but if the interval of the timer is further increased, fine dimming level adjustment is possible. In addition, the LED lighting driver 80 may be configured as a flyback converter or a forward converter, as shown in FIG.

In the circuit shown in FIG. 6, when the power MOFET 83 is turned on, current flows to the primary winding of the inductor 81, and the inductor 81 is induced with an input voltage. On the other hand, the secondary winding of the inductor 81 is induced a voltage of a polarity opposite to the primary side in the direction of the black spot to conduct a diode, the energy stored in the magnetizing inductance of the inductor 81 to the output side The LED lamp 99 is operated by discharging.

This invention can make a dimmable LED lighting at a low cost. The present invention can provide a dimming function in the existing lighting using the wall switch 98 without additional wiring work or adding additional equipment. Functions necessary for dimming are included in the switching controller 100. In order to store the dimming level, the low-power off-timer 96 is utilized to measure the time taken when the wall switch 98 is turned off momentarily and then turned on, thereby switching the switching controller 100 to the corresponding duty cycle. Operation to enable dimming, which is possible to maintain the timer value using energy stored in the power capacitor 92 during the turn-off.

The LED lighting device of the present invention is adapted to A19, PAR30, PAR38, and the like, which are conventional lighting equipment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

In addition, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

80: LED lighting driver 81: inductor
82: reflux diode 83: power MOSFET
84: current sensing resistance 85: comparator
86: gate driver 90: voltage supply circuit
91: rectifier diode 92: power capacitor
93: bias winding 95: start-up resistor
96: off-timer 98: wall switch
99: LED lamp 100: switching controller
101: AC power supply 102: full-wave rectifier

Claims (10)

In the LED lighting device that controls the on / off of the LED lamp by turning on / off the power through the wall switch operation,
A constant current is generated from the rectified DC voltage through the full-wave rectifier 102 that receives AC power through the wall switch 98 and supplies the rectified DC voltage to the LED lamp 99, and supplies the voltage to the LED lamp 99. The LED light driver 80 measures the turn-off time of the wall switch 98 and receives multi-level dimming according to the turn-off time of the off-timer 96 that provides the dimming level. Is composed by
The off-timer 96
LED turn-off device, characterized in that for measuring the turn-off time of the wall switch 98, the turn-off time for a predetermined time until all the energy of the power capacitor 92 is discharged.
The method of claim 1, wherein the voltage supply circuit 90
While the wall switch 98 is turned on, the inductor 81 and the bias winding 93 are provided on a common magnetic core to rectify the AC voltage induced in the transformer, thereby supplying the DC voltage without the ripple. LED lighting device.
The method of claim 1, wherein the LED light driver 80
An inductor 81 connected to the LED lamp 99;
An anode connected to the inductor 81 and a cathode connected to a terminal to which a rectified DC voltage is supplied and a reflux diode 82 connected to an LED lamp 99;
A power MOSFET 83 connected between the anode of the reflux diode 82 and GND;
The duty cycle of the power MOSFET 83 is controlled according to the off time value of the wall switch 98 measured by the off-timer 96 while being driven by the VDD1 voltage, which is the output voltage of the voltage supply circuit 90. LED lighting device comprising a ;, a switching controller (100) for providing a multi-level dimming.
4. The power MOSFET of claim 3, wherein
LED lighting device, characterized in that the switching operation is stopped when the external wall switch 98 is turned off.
The method of claim 3,
When the switching operation of the power MOSFET 83 is stopped, the supply of energy to the power capacitor 92 is stopped from the bias winding 93 constituting the voltage supply circuit 90, and thus the bias winding 93 LED switching device is characterized in that the voltage is switched to Low, the switching controller (100) is shut down, the off-timer (96) is operated to measure the turn-off time of the wall switch (98). delete The method of claim 3,
When the switching operation of the power MOSFET 83 is stopped, the supply of energy to the power capacitor 92 is stopped from the bias winding 93 constituting the voltage supply circuit 90. LED lighting device characterized in that the voltage is switched to Low the switching controller (100) is shut down.
The method of claim 3,
The off-timer 96 operates to measure the turn-off time of the wall switch 98, but after storing the turn-off time for a predetermined time until all of the energy of the power capacitor 92 is discharged, the wall switch When 98 is turned on again, the off-timer 96 stops measuring time, and the internal regulator 79 operates so that the switching controller 100 refers to the measured off-time value and dimming the corresponding voltage among preset voltages. LED lighting device characterized in that the level is selected and the duty cycle is changed.
The method of claim 3, wherein the switching controller 100
When the wall switch 98 is turned off, additionally receives an EN signal from the voltage supply unit 90 that detects that energy is not introduced from the bias winding 93, and thus, the switching controller except for the off-timer 96 ( LED lighting device further comprises an internal regulator (79) for shutting down.
The method of claim 3, wherein the switching controller 100
When the power MOSFET 83 is turned on, current flows to the primary winding of the inductor 81, the inductor 81 is induced with an input voltage, and the secondary winding of the inductor 81 is in the direction of the black spot. It is a flyback converter or forward converter that operates the LED lamp 99 by inducing a voltage of opposite polarity to the primary side, conducting the diode, and releasing energy accumulated in the magnetization inductance of the inductor 81 to the output side. LED lighting device.

Images