KR101708400B1 - A LED lamp for multistage illumination by detecting the power-off - Google Patents

Abstract

The present invention relates to an LED lamp for implementing a dimming effect of the LED lamp by On/Off of a power switch. The LED lamp includes: a power input unit (10) provided therein with a power switch; a power rectifying unit (20) for rectifying power supplied by an on-state of the power switch; a power switching unit (50) for switching the supplied power at the power rectifying unit; a power switch On/Off detecting unit (30) for detecting an On/Off state of the power switch; a power switching element driving PWM IC (40) for supplying a control signal to control the switching of the power switching unit; a transformer (70) for transforming the power switched at the power switching unit (50); a transformer output detecting unit (60) for detecting an output of the transformer; an output voltage rectifying unit (80) for rectifying the output of the transformer (70); and an LED lamp (90) for performing a dimming according to the power rectified at the output voltage rectifying unit (80), in which a signal inputted into an input port of the power switching element driving PWM IC (40) is a detecting signal according to a change of a capacitance at the power switch on/off detecting unit (30), and the power switching element driving PWM IC (40) dims the LED lamp in stages by controlling the power switching unit (50) according to the detecting signal. Based on the above configuration, an impact on a component is mitigated and a lifespan of a product is elongated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LED lamp for multistage illumination,

[0001] The present invention relates to an LED light fixture which is dimmed in multiple steps by detecting power off, and more particularly to an LED light fixture which can realize a dimming effect of an LED lamp by turning ON / OFF of a power switch .

Conventionally, incandescent lamps and fluorescent lamps were mainly used as illumination devices. However, incandescent lamps and fluorescent lamps consume much power compared to lighting efficiency. In addition, since fluorescent lamps are manufactured using mercury and the lamp life is short, they must be replaced frequently. Due to these problems, environmental regulations have been strengthened around the world, for example, in recent years, the ban on the sale of incandescent lamps and fluorescent lamps has been confirmed in some countries.

In recent years, LED (Light Emitting Diode) has been attracting attention as energy saving and green environment as an important issue, and LED lamps are increasingly attached to homes, factories and roads. In the case of this LED lamp, there are simple aspects such as power saving and illumination control. However, in recent years, in order to make people comfortable and work efficiency with the development of emotional engineering through human vision, There is an increasing demand for functions that sequentially control brightness, and studies on the development of circuits related to the dimming control are underway.

This circuit for dimming control is classified into internal and external type. The external type is already patented, but the development of integrated circuit integrated with the converter is relatively expensive. Due to the complexity of the design and the complexity of the assembly, There is an urgent need to study the simple design method.

On the other hand, a power supply circuit of a low-capacity light emitting diode is mainly used in which a rectified voltage is subjected to pulse width modulation (PWM) control and then power is transmitted to a secondary side through a transformer. The power transferred to the secondary side is converted into a DC power by using a diode and a capacitor, and is supplied to the light emitting diode. However, at this time, the ripple voltage is largely generated due to the feedback time, and the ripple current generated due to the ripple voltage causes the flicker phenomenon of the light emitting diode. The flicker phenomenon not only affects the lifetime and the light efficiency of the light emitting diode but also causes the user's eyes to easily fatigue.

One example of the technique for solving such a problem is described in Documents 1 and 2 below.

For example, Patent Document 1 discloses on / off detection means for detecting the on / off state of the illumination switch, and on / off state information for the illumination switch from the on / A dimming control means for controlling the illuminance of the LED lamp when a dimming signal is input from the dimming determination means, a driving power supply for supplying the driving power to the LED lamp during the snapping operation of the lighting switch, And a power holding circuit portion for controlling the LED lamp.

(A) when the power on signal for lighting the LED is transmitted, the output brightness setting control unit controls the LED to be outputted at the maximum brightness for a predetermined time through the LED control unit, (b) Wherein the output brightness setting control unit determines whether the power off and on signals are sequentially transmitted within a predetermined time period in which the LED is output at the maximum brightness; and (c) Recognizing the power off and on signals sequentially transmitted by the output brightness setting controller as an 'initialization setting signal' when the power off and on signals are sequentially transmitted within a predetermined time period during which the output brightness setting signal is outputted at the maximum brightness; ) The output brightness setting control unit gradually increases the brightness of the LED through the LED control unit and outputs the LED brightness in a stepwise manner from the minimum brightness to the maximum brightness (E) determining whether the power-off signal is transmitted while the output brightness setting controller is stepping out the LED from the minimum brightness to the maximum brightness, (f) determining whether the power- , Recognizing the power-off signal transmitted by the output brightness setting controller as an 'output brightness setting signal' when the power-off signal is transmitted while the LED is output stepwise from the minimum brightness to the maximum brightness, and (g) And setting an output brightness of the LED as a brightness level at a time point at which the output brightness setting control unit receives the power-off signal is set as an output brightness setting method.

Korean Registered Patent No. 10-0970613 (Registered on July 7, 2010) Korean Registered Patent No. 10-1308565 (Registered on September 3, 2013)

However, in the conventional art as described above, a variety of dimming devices in a lighting apparatus sensing an interval and a frequency between on / off of a power switch and an LED lamp are used. However, such a dimming device is a complicated electronic circuit such as a microprocessor, a memory, a timer, and the like which calculates and stores a signal for controlling dimming according to an interval or a time of on / And a separate algorithm for controlling them is required.

Such a dimming lighting control device is required to use a number of expensive parts such as a microprocessor, a memory, a timer, etc., and is exposed to various power noises due to the nature of lighting due to its power system.

Also, in the above-described conventional technique, a microprocessor is implemented in a power supply device as a method of dimming an LED light on an output side by turning on / off an AC power switch. Because the microprocessor is used separately for dimming, there are cost increase factors such as microprocessor driving circuit, and there is no replacement or compatibility due to the difference in the program used for each microprocessor product, and difficulty in adjusting dimming and returning function Thereby causing inconvenience to the user.

SUMMARY OF THE INVENTION An object of the present invention is to provide an EL light fixture which is dimmed in multiple stages by detecting power off in which dimming control of an LED lamp can be performed by turning on and off a power switch .

It is another object of the present invention to provide an LED light fixture that can be manufactured at a relatively low cost as compared with the conventional technology, and can be dimmed in multiple stages by sensing power-off for prolonging the life of the product.

It is another object of the present invention to provide an LED light fixture which is dimmed in multiple stages by sensing the power-off so as to simplify manufacturing conditions by applying a commercial PWM IC.

In order to achieve the above-mentioned object, an LED illumination device according to the present invention is an LED illumination device which is multi-step dimmed by detecting the power-off, and includes a power input unit 10 having a power switch, A power supply switching unit 50 for switching the power supply in the power supply rectifying unit, a power switch on / off detecting unit 30 for detecting on / off of the power supply switch, A power source switching device driving PWM IC 40 for supplying a control signal for controlling switching, a transformer 70 for transforming the power source switched in the power source switching part 50, a transformer output sensing part for sensing the output of the transformer An output voltage rectifying unit 80 for rectifying the output of the transformer 70 and an LED lamp 90 for performing dimming according to the power rectified by the output voltage rectifying unit 80. [ The signal input to the input terminal of the power switching device driving PWM IC 40 is a sensing signal corresponding to a change in capacitance of the power switch on / off sensing part 30, 40 controls the power switching unit 50 according to the detection signal to dim the LED lamp in a stepwise manner.

In the LED illumination device according to the present invention, the input to the input terminal of the power switching device-driven PWM IC 40 is connected to a signal input from the transformer output sensing part 60 and a signal input from the power switch on / The input signals are input in parallel.

The power switch on / off detection unit 30 includes a reset resistor R_Reset connected in parallel between the power rectification unit 20 and the power switching device driving PWM IC 40, And includes a noise bypass capacitor C2 and a filter capacitor C2A.

In the LED illumination device according to the present invention, when the power switch is turned on, the power switching device-driving PWM IC 40 reads the energy value stored in the capacitor C2A. In the initial stage, the LED lamp 90 And when the power switch is turned off, the charged value of the capacitor C2A is discharged, and when the power switch is turned on again within a predetermined time, the second signal is recognized as the input value, and the LED lamp 90 is turned on in the second state When the power supply switch is turned off again and the power supply switch is turned on within a predetermined time after the charge of the capacitor C2A is discharged, the third signal is automatically detected as the input value, and the LED lamp 90 is controlled to be turned on in the third state .

In the LED illumination device according to the present invention, the power switching unit 50 includes an IGBT (Insulated Gate Bi-Polar Transistor), and the control signal of the power switching device driving PWM IC 40 is a pulse waveform Is applied to the gate (G) of the IGBT (Q1) so as to control on / off of the IGBT (Q1).

As described above, according to the LED illumination lamp apparatus which is dimmed in multiple steps by sensing the power-off according to the present invention, it has a soft start function when the on / off dimming lighting is performed according to the design value of the capacitor provided in the power switch on / Therefore, it is possible to mitigate the impact of vulnerable parts in the circuit from the inrush current flowing when the power switch is turned on / off, to prolong the life of the product, and to provide the user with a soft sensibility function Can be obtained.

In addition, according to the LED illumination lamp apparatus that is dimmed in multiple stages by sensing the power-off according to the present invention, various ICs can be selected without designing the PWM dimming control IC of a specific product, and an input signal energy conversion circuit suitable for the IC can be designed , It is also possible to use a customized IC having a specific dimming degree and dimming percentage required by the designer if necessary.

In addition, according to the LED lighting apparatus which is illuminated in multi-steps by sensing the power-off according to the present invention, the LED lighting apparatus distinguishes the LED lighting apparatus from the dimming lighting apparatus using the conventional microprocessor and has the on / It is also possible to produce and distribute it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an LED illumination device which is dimmed in multiple steps by detecting power-
Fig. 2 is a circuit diagram of the LED illumination lamp shown in Fig. 1,
FIGS. 3 to 12 are views showing photographs to which an LED illumination lamp according to the present invention is applied. FIG.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

The LED lighting device according to the present invention detects a change in capacitance due to ON / OFF detection of a power switch by a signal input to the input terminal of the PWM IC driving the power switching device, Let it be dimmed.

That is, when a switch ON / OFF signal is input to a PWM IC used in a conventional power supply device, that is, when an initial switch-on signal is input, the switch is turned on in a first state (for example, 100% (For example, 50%) when the third on-signal is received within a predetermined time, and the second state (for example, 50% And a specific energy value is input to the PWM IC, thereby performing a dimming step of the LED lamp.

For example, the multi-step dimmable LED illumination device according to the present invention converts an on / off signal of a switch in a wall power source into a signal having a specific energy value, supplies the PWM signal to the PWM IC, .

The dimming percentage of the lighting can be changed by the PWM IC in different orders, and the switch dimming function of the PWM IC can be changed in percentage.

That is, in case of 100%, 75%, 50% sequential dimming of the first to third states, 100% is turned on when the initial switch is turned on and the switch is turned off within a programmed time, If the switch is immediately turned on, it is turned on at 75%, and if the switch is turned off within 3 seconds and the switch is immediately turned on, it can be turned on at 50% , And the percentage of dimming can be arbitrarily divided into values between 10 and 100%.

Hereinafter, the configuration of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an LED illumination device illuminated in multi-steps by detecting the power-off according to the present invention, and FIG. 2 is a circuit diagram of the LED illumination device shown in FIG.

As shown in FIG. 1, the LED illumination device according to the present invention includes a power input unit 10 having a power switch, a power source (not shown) provided in the power input unit 10, A power supply rectifying section 20 for rectifying the power supplied by the ON of the switch, a power switch on / off detecting section 30 for detecting on / off of the power switch, a control signal for controlling switching of the switching element for switching the power supply A transformer output sensing unit 60, a transformer 70 for transforming a switched power source in the power source switching unit 50, a transformer 70 for converting the power source switched in the power source switching unit 50, And an LED lamp 90 for performing dimming according to a power source rectified in the output voltage rectifying unit 80. The LED lamp 90 is a rectifier for rectifying the output of the output voltage rectifying unit 80,

The input power supply unit 10 is a circuit for receiving 220 V, 60 Hz AC input or commercial AC power, and includes a circuit for protecting the power supply switch and the input power supply from surges, a noise filter circuit for removing noise from the input power supply Respectively.

In the meantime, in the circuit of FIG. 2 according to the present invention, the main characteristic configuration of the present invention will be mainly described, and description of connection and operation of known components will be omitted.

As shown in FIG. 2, the input power source unit 10 may include a fuse and a surge protection circuit at an input terminal of a commercial AC power source (BLACK, WHITE). The fuse (FUSE) protects the product by preventing the fire by cutting off the input power when the over current occurs due to the abnormal condition of the product.

The surge protection circuit consists of a surge arrester and a varistor. That is, the surge protection circuit connects the arrester and the varistor in series and constitutes the input terminal of the power supply. Therefore, the surge protection circuit absorbs the surge voltage of high potential that flows through the transmission line such as a lightning strike when the power is inputted. This makes it possible to safely protect the LED lighting fixture from surge voltage.

Further, the input power supply unit 10 is constituted by a multi-stage low-pass filter (LF), a capacitor or the like, and removes noise on the power source. This stabilizes the AC power input. That is, the input power supply unit 10 includes an inductor L and a capacitor C, and blocks noise (EMI) introduced from the AC power supply and high frequency noise generated from the inverter when the power supply is input. This filter minimizes noise (EMI) by blocking both COMMON MODE NOISE and NORMAL MODE NOISE.

The power rectifier 20 rectifies the AC input having the minimum noise to a constant current through the input power source 10. That is, the power rectifying unit 20 includes a rectifying circuit for converting the AC power source AC into a DC power source DC. In particular, the power rectifying unit 20 is a circuit for rectifying the power supplied to the transformer 70 or the LED lamp 90, and includes a circuit for rectifying the main power.

The power rectification unit 20 is composed of a bridge diode BD1 and rectified as shown in FIG. The power rectifying unit 20 may include a smoothing circuit for smoothing the pulsating current of the rectified current. That is, the smoothing circuit is composed of the choke coil L1 and the capacitor C1, removes the pulsating current, and outputs the direct current power through the capacitor C1.

The power switch on / off detection unit 30 is a circuit for detecting the on / off state of the power switch from the current supplied through the resistors R1 and R2 in the power rectification unit 20. The capacitors C2, C2A and a reset resistor R_Reset. The capacitor C2 is used for noise bypass, and the capacitor C2A has a function of a filter.

Further, a current is applied to the VCC of the power-supply switching device-driven PWM IC 40 via the resistors R1 and R2, and the PWM IC 40 is turned on. The signal input to the input terminal of the power switching device driving PWM IC 40 is a sensing signal according to the capacitance change in the power switch on / off sensing part 30, and the power switching device driving PWM IC 40 senses And controls the power switching unit 50 according to a signal to gradually dim the LED lamp.

That is, when the power supply switch provided in the power input unit 10 is turned on, the PWM IC 40 reads the energy value stored in the capacitor C2A, and when the LED lamp 90 is initially turned on by 100% When the power supply switch is turned on within 3 seconds after the charged value of the capacitor C2A is discharged, the second signal is recognized as the input value, and the LED lamp 90 is turned on by 75%. When the power supply switch is turned off again, If the power switch is turned on within 3 seconds after the charge value is discharged, the third signal is automatically detected as the input value, and the LED lamp 90 is turned on at 50%. The function of the PWM IC 40 is added to the dimming mode so that the VCC charging / discharging state is sensed to make a desired dimming state. If the power switch is turned on after a predetermined time, for example, 3 seconds after 100%, 75% or 50% of the step being operated in the dimming state is turned off, the LED lamp 90 is reset to the initial value, Is turned on at 100%.

For example, when the LED lamp 90 is 100% used, the LED lamp 90 is turned off, the LED lamp 90 is turned off when the LED lamp 90 is in use, In any case, if the power switch is turned off and then the switch is turned on after 3 seconds, the LED lamp 90 is reset to 100% because it is reset. In the above description, the time 3 seconds is described as an example, and the time after power-off can be changed as much as necessary.

As described above, in the LED lighting device which is dimmed in multi-step by detecting the power-off according to the present invention, a single PWM IC 40 implements a power switch on / off signal sensing dimming system, Contributing to savings. The PWM-IC 40 used in the present invention utilizes a known device such as H4102N manufactured by Huizhin Electronics of China, and it is obvious that a commercially available device that exhibits the same performance as the H4102N can be used . Therefore, the operation principle of the PWM-IC 40 is well-known, and a detailed description thereof will be omitted.

2, the power supply switching unit 50 is provided for switching the current supplied from the power supply rectifying unit 20, and the drive signal at the gate terminal of the PWM-IC 40 is supplied as a control signal IGBT (Insulated Gate Bi-Polar Transistor, Q1) receiving a pulse waveform of a magnitude of That is, the gate G of the IGBT Q1 is connected to the gate terminal of the PWM-IC 40, the drain D of the IGBT Q1 is connected to the output terminal of the power rectifying unit 20, Is supplied to the transformer 70 via the inductor B1 and the diode D1. As described above, the gate drive signal of the PWM-IC 40 inputted to the gate of the IGBT Q1 is supplied to the capacitor C2A when the power switch is turned on and off within a predetermined time (for example, three seconds) Off state and the order of the output of the transformer 70, and sequentially outputs an output having a different duty ratio to the transformer 70.

For convenience of explanation, the switching element Q1 is described based on an IGBT (Insulated Gate Bi-Polar Transistor) for convenience of explanation. It is obvious that a FET (Field Effect Transistor) can also be used. .

The transformer output sensing unit 60 includes a primary side second winding T2 of the transformer 70 and senses an output of the transformer 70. The sensing signal is input to the power switch on / And the power-supply switching device-driven PWM IC 40 in parallel.

The transformer 70 receives the output of the power switching unit 50 as a primary input, boosts or reduces the input power, and outputs the transformed current as a secondary power. The transformer 70 is composed of two windings T1 and T2 on the primary side and one winding T3 on the secondary side. The primary winding T1 is a winding connected to the power switching unit 50, and transforms the secondary winding to a secondary winding. The secondary winding T2 on the primary side is a transformer output sensing unit 60 and is a winding for supplying the power supply (VCC) of the power switching device-driven PWM IC 40. In other words, the power supply (VCC) of the PWM IC 40 is supplied with the power generated by the primary side second winding T2.

The PWM IC 40 applies a pulse waveform having a constant duty ratio to the gate G of the IGBT Q1 for PWM control. That is, the output of the first primary winding T1 of the primary winding of the transformer 70, to be inputted to the VCC terminal of the PWM IC 40, compares it with a predetermined reference voltage, and generates a pulse having the duty ratio corresponding thereto Is applied to the gate (G) of the IGBT (Q1) to keep the output of the primary winding (T1) constant.

The output voltage rectifying unit 80 includes diodes D4 and D5 connected to the secondary side T3 of the transformer 70, capacitors C7 and C8 connected in parallel, a resistor R19, And rectifies the output of the secondary side T3.

The LED lamp 90 is composed of a plurality of LED elements. The LED lamp 90 receives the DC power output from the output voltage rectifying unit 80 as a power source, and emits the LED elements.

As described above, a feature of the present invention is that the known PWM-IC is used, and the VCC terminal of the PWM-IC 40 is turned on in order to sequentially turn on and off the power switch, A signal input from the transformer output sensing unit 60 and a signal input from the output of the power rectifying unit 20 are input to the input terminal of the power switch on / off sensing unit 30 in which the capacitor C2A and the resistor R_Reset are connected in parallel. The LED lamp 90 is turned on and off within a predetermined time (for example, three seconds, which may be variable in accordance with the capacity of the capacitor C2A) after the power switch is turned on, The LED lamp 90 is dimmed to 50% when it is off-on within a predetermined time (3 seconds). After that, when the power switch is turned off and then turned on, the LED lamp 90 90) to 100%. It is a district. In this case, when the power is turned on and off after 3 seconds, the power is dimmed to 100% at all times.

In addition, an overvoltage protection circuit and a low-voltage protection circuit can be provided in an LED illumination lamp mechanism that is dimmed in multiple stages by detecting the power-off according to the present invention.

That is, if the input voltage exceeds the predetermined voltage range, the overvoltage protection circuit cuts off the power supply and cuts off the power to the LED lamp 90. The overvoltage protection circuit cuts off the power supply when the rectified input voltage is equal to or higher than the predetermined first reference voltage, and the low voltage protection circuit cuts off the power when the rectified input voltage is lower than the predetermined second reference voltage. Therefore, the power can be supplied to the LED lamp 90 only when the input voltage is between the first reference voltage and the second reference voltage.

For example, if the voltage between the line and ground is raised, the AC input voltage can be input at a low voltage of 180V AC or less even if the LED light switch is turned off. In this case, the prior art LED light fixtures emit unstable light such as a half-light. As another example, when the LED light fixture is first installed in the field, the power supply connection can be erroneously wired. In this case, when the power is applied after the 3-phase 380V AC is connected incorrectly, the power supply unit may cause an error or break due to the overvoltage. At this time, the LED light fixture does not turn on. Occasionally, the LED module of the LED lighting fixture is often dead. That is, when the AC input voltage is input to a low voltage or an overvoltage, that is, when a voltage exceeding the input allowable voltage range or a voltage outside the free voltage range is input, An overvoltage protection circuit and a low voltage protection circuit can be provided.

Meanwhile, the LED illumination device according to the present invention can be applied to all LED illumination devices and LED illumination devices, for example, an LED illumination device as shown in FIGS. 3 to 11.

LED spotlight, etc., LED spotlight, etc., LED spotlight, etc., LED spotlight, MR16 lamp, LED runway type / terminal, LED corner, LED lawn light, LED lamps, LED stop lamps, LED black lamps, LED fog lamps, converter external LED lamps, LED induction lamps, LED lamps, LED landscape lamps, converter built-in LED lamps, (G13, G10 Base type) / LED lamps, LED lamps, LED guidance lamps, LED lamps, LED lamps, LED FPL lamps, LED street lighting, LED lighting fixtures, etc., including LED lighting fixtures, LED lighting fixtures, LED street lighting, etc., LED street lamps, etc. LED spotlights, LED spotlights, LED sensor lights, LED floodlights, recessed and fixed LED lighting fixtures, LED ledge identification lights, LED indirect lighting, (E12, 14, 17, 26, etc.), LED lights, LED lights, LED lights, LED tunnels, LED airfield lighthouse, LED wall lights, LED explosion- 39 Base type), LED underwater lights, LED turn lights, LED surface lights (edge, direct under), LED pick-up lights, LED runway guide lights, LED stairs, LED solar street lights, LED runway terminal identification, LED down light, - LED street light, LED runway lights, LED multi-down light, LED solar road guide light, LED runway center line, LED parking lot, LED high ceiling light, LED runway street, etc. .

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

By using the LED illumination lamp apparatus which is dimmed in multiple steps by sensing the power-off according to the present invention, it is possible to reduce the cost and energy of the LED illumination lamp apparatus.

10: power input part 20: power rectification part
30: Power switch on / off detection part 40: Power supply switching device driving PWM IC
50: power supply switching unit 60: transformer output detection unit
70: Transformer 80: Output voltage rectifying section
90: LED lamp

Claims (5)

An LED light fixture which is dimmed in multiple steps by detecting power off,
A power input unit 10 having a power switch,
A power rectification unit (20) for rectifying the power supplied by turning on the power switch,
A power switching unit 50 for switching the power supply in the power rectification unit,
A power switch on / off detection unit 30 for detecting on / off of the power switch,
A power source switching device driving PWM IC 40 for supplying a control signal for controlling the switching of the power source switching unit,
A transformer 70 for transforming the switched power source in the power source switching unit 50,
A transformer output sensing unit 60 for sensing the output of the transformer,
An output voltage rectifying unit 80 for rectifying the output of the transformer 70,
And an LED lamp (90) for performing dimming according to the power rectified by the output voltage rectifying unit (80)
The signal input to the input terminal of the power switching device driving PWM IC 40 is a sensing signal according to a change in capacitance of the power switch on / off sensing part 30, and the power switching device driving PWM IC 40 Controls the power switching unit (50) according to the detection signal to dim the LED lamp stepwise,
An input to the input terminal of the power switching device-driven PWM IC 40 receives a signal input from the transformer output sensing unit 60 and a signal input from the power switch on / off sensing unit 30 in parallel ,
The power switch on / off detector 30 includes a reset resistor R_Reset connected in parallel between the power rectifier 20 and the power switching device driving PWM IC 40, a capacitor C2 for noise bypass, , And a capacitor (C2A) for use. delete delete The method of claim 1,
When the power switch is turned on, the power switching device-driving PWM IC 40 reads an energy value stored in the capacitor C2A. In the initial state, the LED lamp 90 is turned on in the first state, and when the power switch is turned off When the power supply switch is turned on again within a predetermined time after the charged value of the capacitor C2A is discharged, the second signal is recognized as the input value, and the LED lamp 90 is turned on in the second state. When the power supply switch is turned off again, C2A) charge value is discharged, and when the power switch is turned on within a predetermined time, the third signal is automatically detected as the input value, and the LED lamp 90 is controlled to be turned on in the third state. The method of claim 1,
The power switching unit 50 includes an IGBT (Insulated Gate Bi-Polar Transistor) or a FET (Field Effect Transistor), and the control signal of the power switching device driving PWM IC 40 is a pulse waveform of a predetermined magnitude. Is applied to the gate (G) of the IGBT (Q1) so as to control on / off of the transistor (Q1).

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