KR101386143B1 - Apparatus and Method for Supplying Power of LED Lighting, and LED Lighting Apparatus Using That - Google Patents

Abstract

The present invention relates to a power supply device for LED lamps and a method thereof, and to an LED lighting device using the same. The AC power is rectified in a rectifying part of a bridge diode, and then charged in a charging / discharging part (condenser), and the charging / discharging part is charged. The applied power is applied to the gate terminal of the field effect transistor (or an integrated circuit of the same function) as a direct current component, thereby outputting a current close to the direct current by removing the pulsation component from the current flowing to the drain-source of the conducted field effect transistor. To provide a plurality of light emitting diodes, and to provide a power supply for LED lighting and a method and an LED lighting device using the same.
To this end, the present invention is a power supply for LED lighting, comprising: a rectifier for rectifying the applied AC power to output a pulse flow; A constant current unit for limiting current to a constant level in the pulse flow from the rectifier; A charging and discharging unit configured to charge the pulse current through the circuit protection unit from the constant current unit and to discharge the current of the DC component when the voltage exceeds the threshold voltage; A pulsation component removal unit for outputting a direct current by removing the pulsation component from the pulse flow from the constant current unit according to the discharge current of the direct current component from the charge / discharge unit; And the circuit protection unit for protecting the circuit.

Description

Power supply for LED lighting and its method and LED lighting device using the same {Apparatus and Method for Supplying Power of LED Lighting, and LED Lighting Apparatus Using That}

The present invention relates to a power supply device for LED (Light Emitting Diode) light, and a method and an LED lighting device using the same, more specifically, after the AC (AC) power rectified in the rectifier of the bridge diode charge and discharge unit (Capacitor), and the electric power charged in this charge / discharge unit is applied as a direct current component to the gate terminal of the field effect transistor (or an integrated circuit of the same function), and thus the current flowing to the drain-source of the conducted field effect transistor. The present invention relates to a power supply device for an LED lamp and a method thereof and an LED lighting device using the same for removing a pulsating component and outputting a current close to a direct current to light a plurality of light emitting diodes.

As is generally well known, incandescent lamps and fluorescent lamps are mainly used as light sources of conventional lighting equipment. In particular, fluorescent lamps have been used for a long time because they are superior in terms of power consumption and heat generation, as compared to incandescent lamps.

These types of fluorescent lamps include fluorescent lamps with a diameter of 32 mm, which are mainly used for general home use, and fluorescent lamps with diameters of 15.5 mm to 20 mm, which are used for shelves displaying products such as cosmetics and foods (T5 and T6 tubes). There is this. The length of the fluorescent lamp is determined according to the standard in the range of approximately 400 mm to 1400 mm.

1 is a circuit diagram of a conventional fluorescent lamp lighting inverter circuit.

As shown in FIG. 1, a conventional fluorescent lamp lighting inverter circuit 9 includes a rectifying smoothing circuit 1 rectifying and smoothing a commercial power supply AC and a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). (Q1, Q2), the drive circuit (2) for driving the switching elements (Q1, Q2), the drive circuit (2) by controlling the PWM (Pulse Width Modulation) method to turn on / off the switching elements (Q1, Q2) The control circuit 3, the choke coil L10 as a preheating circuit which preheats the fluorescent lamp 4 at the start-up, and the resonance capacitor C11 are comprised.

In the above configuration, the rectifying smoothing circuit 1 is composed of a diode bridge, a smoothing capacitor, and the like. The freewheel diodes D1 and D2 are connected in parallel between the drain and the source of the switching elements Q1 and Q2, respectively. The capacitor C12 is connected in series between the choke coil L10 and the fluorescent lamp 4.

On the other hand, one socket of the inverter circuit 9 (lighting mechanism) connected to the connecting pin of the fluorescent lamp 4 is provided with a pair of lamp input terminals 5a and 5b, and the other socket also has a pair of lamp inputs. Terminals 5c and 5d are provided. When the connecting pin of the fluorescent lamp 4 is coupled to the socket by this configuration, one filament of the fluorescent lamp 4 is connected to one lamp input terminal 5a, 5b and the other filament is the other lamp input terminal. Connected to 5c and 5d, whereby the first current I ₁ shown by the dotted line flows at the start of the lighting to discharge the fluorescent lamp 4, and after the fluorescent lamp 4 is lit by the dotted line. The second current I ₂ flows.

On the other hand, in recent years, as part of efforts to reduce carbon emission, which is a major cause of ozone layer destruction, the luminaires using low power consumption LEDs (light emitting diodes) as light sources have been gradually expanded. It is not difficult to design a power circuit suitable for the LED device characteristics from the beginning, but since the existing lighting device and the inverter circuit used here are all designed for fluorescent lamps, the newly manufactured LED lighting is eliminated. The installation of the device is not only enormous cost and time, but also causes a waste of resources.

In order to solve this problem, the existing fluorescent lamp lighting inverter circuit 9 is used as it is, but instead of the fluorescent lamp 4, a fluorescent lamp and an LED lamp having the same physical specifications, that is, the same diameter, tube length, and connecting pin structure (EL light) Lamp or LED straight lamp) (hereinafter referred to as 'fluorescent type LED lighting lamp (EL fluorescent lamp or LED straight lamp)' and abbreviated as 'LED lighting lamp (EL fluorescent lamp or LED straight lamp)'. However, even though the physical specifications of LED lamps (EL lamps or LED lamps) are the same as those of fluorescent lamps, the electrical characteristics of LED lamps (EL lamps or LED lamps) and fluorescent lamps are completely different. Inside the tube of the LED tube lamp, a separate power supply circuit for the LED lamp, for example, a full-wave rectification circuit for rectifying the high frequency output of the inverter circuit 9 as shown in FIG.

2 is a power circuit diagram of a fluorescent lamp type LED lighting apparatus according to a conventional example, FIG. 3 is a power circuit diagram of a fluorescent lamp type LED lighting apparatus according to another conventional example, and FIG. It is a power supply circuit diagram of a fluorescent type LED lighting device.

First, the power supply circuit for the simplest type of LED lighting lamp (EL lamp or LED tube lamp) is between the lamp input terminals 5a, 5b of one of the inverter circuit 9 shown in FIG. 1, as shown in FIG. When the shorting section shorted to be X terminal and the shorting section shorting between the other lamp input terminals 5c and 5d to Y terminal, for example, the X terminal and the Y terminal open the fuse 14. It is connected to the input side of the high frequency rectification circuit 11 which consists of a diode bridge via, and the LED unit 12 containing a some LED is connected in parallel to the output side of the high frequency rectification circuit 11.

In the above-described configuration, the high frequency rectifying circuit 11 is composed of four first recovery diodes to full-wave rectify the high frequency input through the X terminal and the Y terminal.

However, according to the LED illuminator (EL lamp or LED intuitive lamp) 50 having the power circuit shown in Fig. 2, the brightness of the LED unit 12 is the same as or slightly brighter than that of the fluorescent lamp 4, but in terms of power consumption In comparison with fluorescent lamps (4), the lifespan of LED lamps (EL lamps or LED straight lamps) can be extended due to the long life of the LED itself, but there is little energy saving effect. The purpose becomes colorless. In addition, since the power source rectified by the high frequency rectifying circuit 11 is simply used as it is, there is a problem that the LED flickers due to the valley of the pulse flow.

In order to improve this problem, as shown in FIG. 3, by further comprising a smoothing capacitor C20 on the output side of the high frequency rectifying circuit 11, it is considered to bring the voltage applied to the LED unit 12 close to DC. Can be. However, in order to close the voltage applied to the LED unit 12 to a direct current in order to prevent the blinking of the LED in this way, the capacity of the smoothing capacitor C20 should be increased to about 220 μF, for example. The use of C20) not only increases the size and weight of the power supply circuit, but also increases the cost.

Furthermore, the ripple current flowing into the smoothing capacitor C20 of the smoothing circuit increases due to the high frequency from the inverter circuit 9, which shortens the life of the smoothing capacitor C20, and as a result, the lifetime as the lighting device is shortened. The problem arises.

A configuration for solving this problem is the power supply circuit for the LED lamp of Figure 4 disclosed in Japanese Patent Laid-Open No. 11-135274. As shown in FIG. 4, the power supply circuit for the LED lamp according to another conventional example connects the smoothing capacitor C20 to the output terminal of the high frequency rectifier circuit 11 through an inductance element L20.

In the power supply circuit of FIG. 4, the inflow of the ripple current into the smoothing capacitor C20 is suppressed by the action of the inductance element L20, thereby achieving a long life while reducing the capacity of the smoothing capacitor C20. Nevertheless, since the electrolytic capacitor is used as the smoothing capacitor (C20), its life is only about tens of thousands of hours, which is still shorter than that of the LED unit (e.g., 170,000 to 200,000 hours). The problem arises that the lifetime of the lighting device is shortened.

However, according to the power supply circuit of Fig. 4, since the high frequency power supply from the inverter circuit 9 is directly supplied to the high frequency rectifier circuit 11, there is a possibility that the power consumption is not suppressed. There is a problem that the purpose of introduction is colorless. In addition, the capacitance of the inductance element L20 should be increased to about 2H, for example. However, when the inductance element L20 having a large capacity is used, the power supply circuit is not only large and large in weight, but also has a problem of high cost. .

Thus, on December 22, 2010, a patent application No. 10-2010-0132836 (power supply circuit for fluorescent lamp type LED lighting) was proposed.

5 and 6, this suppresses the current flowing in the LED lamp 10, i.e., suppresses the power consumption of the entire power consumption including the LED lamp 10 and the inverter circuit (9). The first inductance element L1 is connected in parallel to the input side of the high frequency rectifier circuit 11 as an element, and the second inductance element L2 is connected between the output terminal of the high frequency rectifier circuit 11 and the anode side of the LED unit 12. ) Are connected in series. Here, the second inductance element L2 may be connected to the cathode side of the LED unit 12.

In the above-described configuration of FIGS. 5 and 6, when the high frequency voltage from the inverter circuit 9 is supplied to the LED lamp 10 as a power source, the high frequency is rectified and rectified by the high frequency rectifying circuit 11 to the LED unit 12. As a result, each LED of the LED unit 12 is driven to emit light.

Since the LED is used as the light emitting source, the power consumption can be significantly reduced as compared with the fluorescent lamp (4).

In addition, on the LED illuminating lamp (EL light or LED linear lamp) 10 side, one lamp input terminal 5a, 5b of the inverter circuit 9 is short-circuited, and the other lamp input terminal 5c, 5d is also short-circuited. Therefore, it can attach without minding the mounting direction of the tubular LED illuminating lamp 10, and, thereby, can reliably light up the LED illuminating lamp 10 regardless of an installation direction. That is, even if the LED lamp (El light or LED straight lamp) 10 is connected to the left and right side can be reliably turned on.

In this case, since the first inductance element L1 is provided between the X terminal and the Y terminal to which the high frequency from the inverter circuit 9 is applied, the first inductance element L1 provides a connection between the X terminal and the Y terminal. While the voltage is suppressed and the current flowing to the high frequency rectifier circuit 11 side is suppressed, the current flowing to the LED unit 12 by the second inductance element L2 is suppressed.

That is, not only the power supply to the LED unit 12 can be suppressed, but also heat generation can be suppressed, and as a result, the overall power consumption including the inverter circuit 9 and the LED illuminating lamp (EL lamp or LED linear lamp) 10 can be reduced. It can restrain and can save energy further. In addition, oscillation of the inverter circuit 9 does not stop, and the inverter circuit 9 can be operated normally.

As described above, the conventional power supply circuit for fluorescent lamp type LED lamps can suppress heat generation and suppress overall power consumption, but can not eliminate the pulses that appear when rectifying and supplying AC power to DC. Due to the problem that the eye shake phenomenon appears and there is a problem that the power factor is dropped. In addition, conventional fluorescent ballasts have different control methods for each manufacturer, and even though LED lamps of the same standard are used, power consumption is output at 100-400% differently to LED lamps. have.

On the other hand, as of December 12, 2008, Patent Application No. 10-2008-0126643 (LED fluorescent light connection circuit for fluorescent lamps) has been proposed.

As shown in FIG. 7, this is a LED light connection circuit for fluorescent lamps configured to have two terminals at both ends thereof so as to be coupled to both sockets of fluorescent lamps, and includes a rectifier circuit 200 and 210 and a circuit protection unit 230. , And LED drive circuit 240.

At this time, the rectifier circuits 200 and 210 are respectively located at both ends (rectifier circuit 1 (200) and rectifier circuit 2 (210)), rectifying the power supplied through the two terminals of each one end with a DC power supply LED drive Supply to circuit 240.

The AC power input can be input from a total of four terminals, ⓐ, ⓑ terminals of the rectifier circuit 1 (200) and ⓒ, ⓓ terminals of the rectifier circuit 2 (210), and the input wiring method using the four terminals is ⓐ − There are six cases ⓑ, ⓒ-ⓓ, ⓐ-ⓒ, ⓐ-ⓓ, ⓑ-ⓒ and ⓑ-ⓓ.

The circuit protection unit 230 protects the LED drive circuit 240 by controlling the DC power rectified from the rectifying circuit 200 or 210. In this case, the circuit protection unit 230 may be connected in series between the rectifier circuit 200 or 210 and the LED drive circuit 240, and cuts off the circuit when overcurrent and surge current are supplied from the rectifier circuit 200 or 210. One fuse 234 and one thermistor 232 may be included.

However, the conventional LED light connection circuit for fluorescent lamps as shown in FIG. 7 controls the rectified DC power to protect the LED drive circuit 240, but eliminates the pulse flow that appears when rectifying and supplying the AC power to DC. There is a problem that the eye tremors appear due to the severe blinking and the power factor drops.

As described above, the prior art uses a large capacity smoothing capacitor or a large capacity smoothing capacitor and an inductance element, which not only increases the size and weight of the power supply circuit, but also increases the cost and the life of the LED lighting device due to the short life of the electrolytic capacitor. If there is a shortening problem, or if a large capacity smoothing capacitor or a large capacity smoothing capacitor and inductance element are not used, the ripple caused by rectifying and supplying AC power by direct current cannot be eliminated. There is a problem that the power factor falls, it is a problem of the present invention to solve this problem.

Therefore, the present invention can remove the pulses generated when rectifying and supplying AC power by direct current without using a large capacity smoothing capacitor (electrolytic capacitor) or a large capacity smoothing capacitor and inductance element, and a power supply device for LED lamps and the like. It is an object of the present invention to provide a method and an LED lighting device using the same.

That is, according to the present invention, the AC power is rectified in the rectifying part of the bridge diode and then charged in the charging / discharging part (capacitor), and the power charged in the charging / discharging part is the gate terminal of the field effect transistor (or an integrated circuit having the same function). A power supply for an LED lamp, applied to a direct current component, for pulsating a component from a current flowing through a drain-source of a field effect transistor, and outputting a current close to a direct current to light up a plurality of light emitting diodes; Its purpose is to provide a method and an LED lighting device using the same.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a power supply device for an LED (Light Emitting Diode) light, comprising: a rectifying unit for rectifying an applied AC power and outputting a pulse flow; A constant current unit for limiting current to a constant level in the pulse flow from the rectifier; A charging and discharging unit configured to charge the pulse current through the circuit protection unit from the constant current unit and to discharge the current of the DC component when the voltage exceeds the threshold voltage; A pulsation component removal unit for outputting a direct current by removing the pulsation component from the pulse flow from the constant current unit according to the discharge current of the direct current component from the charge / discharge unit; And the circuit protection unit for protecting the circuit.

On the other hand, the method of the present invention for achieving the above object, in the power supply method in the power supply for LED lighting, comprising the steps of: rectifying the applied AC power to output a pulse flow; Limiting a current to a predetermined level in the output pulse; Receiving and charging the level-limited pulse current through a circuit protection unit and discharging a current of a DC component when the voltage exceeds a threshold voltage; And a pulsation component removal step of outputting a direct current by removing the pulsation component in the level limited pulse stream according to the current of the discharged DC component.

On the other hand, another apparatus of the present invention for achieving the above object, the LED (Light Emitting Diode) lighting device, rectifying unit for rectifying the applied AC power to output a pulse flow; A constant current unit for limiting current to a constant level in the pulse flow from the rectifier; A charging and discharging unit configured to charge the pulse current through the circuit protection unit from the constant current unit and to discharge the current of the DC component when the voltage exceeds the threshold voltage; A pulsation component removal unit for outputting a direct current by removing the pulsation component from the pulse flow from the constant current unit according to the discharge current of the direct current component from the charge / discharge unit; The circuit protection unit for protecting a circuit; And a light emitting diode unit which emits light according to the direct current from the pulsation component removing unit.

As described above, the present invention eliminates the pulsation caused by severe flashing by eliminating the pulse flow generated when rectifying and supplying AC power by direct current without using a large capacity smoothing capacitor (electrolytic capacitor) or a large capacity smoothing capacitor and inductance element. Not only can it be removed, but also the power factor can be improved, and the power circuit can be miniaturized and reduced, and the cost can be reduced and the life of the LED lighting device can be increased by eliminating the electrolytic capacitor. .

That is, in the present invention, an AC power supply passes through a rectifier of a bridge diode, and a pulsation current, which is a pulsating current including an AC component in DC, is connected to a capacitor through a resistor coupled between the drain and the gate of the field effect transistor (FET). By allowing charge and direct current, the discharge current, to turn on the field effect transistor, the pulsation component is removed from the current flowing to the drain-source of the field effect transistor (FET) to output the direct current component, and the direct current component is in series. As it is applied to a plurality of light emitting diodes connected to the LED, the LED is turned on, and the flickering effect of the LED flickers rapidly, and the power factor is improved by turning on the field effect transistor, which is a switching element, by the discharge current. Has the effect of emitting light with high luminance, and a large capacity smoothing capacitor (electrolytic capacitor) The use of small capacitors and field effect transistors (or integrated circuits of the same function), without the use of capacitive smoothing capacitors and inductance elements, not only reduces the size and weight of the power supply circuit, but also lowers the cost and eliminates the electrolytic capacitors. There is an effect that can increase the life of the lighting device.

1 is a circuit diagram of a conventional fluorescent lamp lighting inverter circuit,
2 is a power supply circuit diagram of a fluorescent lamp type LED lighting apparatus according to a conventional example;
3 is a power supply circuit diagram of a fluorescent lamp type LED lighting device according to another conventional example;
4 is a power supply circuit diagram of a fluorescent lamp type LED lighting device according to another conventional example;
5 is a circuit diagram of a power supply circuit for a fluorescent lamp type LED lamp according to another conventional example;
6 is an overall circuit diagram including an inverter circuit in a power supply circuit according to another embodiment of the prior art shown in FIG.
7 is a circuit diagram of a LED lighting connection circuit for fluorescent lamps according to still another conventional example;
8 is a circuit diagram of an embodiment of a power supply for an LED lamp and an LED lighting device using the same;
9 is a circuit diagram of another embodiment of a power supply for an LED lamp and an LED lighting device using the same;
10 and 11 are waveform diagrams for explaining the operation of the power supply for LED lamps according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

And throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between. Also, when a component is referred to as " comprising "or" comprising ", it does not exclude other components unless specifically stated to the contrary .

8 is a circuit diagram of an embodiment of a power supply for LED lamps and the LED lighting device using the same according to the present invention.

As shown in FIG. 8, the power supply device for the LED lamp according to the present invention rectifies the applied AC power supply 800 to output a pulse current (pulsating current containing an AC component in DC) 810. In the pulse current from the rectifier 810, the constant current unit 820 for limiting the current to a certain level, the pulse current is input through the circuit protection unit 850 from the constant current unit 820 and charged and the DC component when the threshold voltage or more A pulsating component removing unit for outputting a direct current by removing the pulsating component from the pulse current from the constant current unit 820 in accordance with the discharge current of the direct current component from the charge and discharge unit 830, the charge and discharge unit 830 to discharge current ( 840, and a circuit protection unit 850 for protecting circuits such as the charge / discharge unit 830 and the pulsation component removal unit 840.

As shown in FIG. 8, the LED lighting device (the lighting device including the LED lamp) according to the present invention includes a rectifier 810, a constant current unit 820, a charge / discharge unit 830, and a pulsation component remover 840. And a power supply device for an LED lamp including a circuit protection unit 850, and a light emitting diode unit 860 which emits light according to a direct current from the pulsation component removing unit 840. Here, the LED lighting device is modularized, one LED lighting device module is standardized to about 20W class, and several to several tens of LED lighting device modules are arranged in parallel according to the power consumption of the lighting lamp to high-power lighting lamps such as street lights or searchlights. Applicable

Looking at each of the components in more detail as follows.

The rectifier 810 may be implemented as a high frequency rectifier circuit composed of a bridge diode. At this time, when the AC (AC) power supply 800 of 220V is applied to the high-frequency rectifying circuit consisting of the bridge diode, the high-frequency rectifying circuit rectifies the AC power supply "pulsating current (pulsating current is a pulsating current containing an AC component in DC) Applied) is applied to the constant current unit 820.

The constant current unit 820 limits the current to a certain level (for example, depending on the power consumption of the lighting device 20 ~ 200 ㎃, 20 ㎃ / per 20 (CRD x parallel number) can be limited to several A class) It can be implemented as a constant current diode. At this time, when the "pulse current, which is a pulsating current including an AC component in the rectifier current" rectified in the high-frequency rectification circuit is applied, the constant current diode outputs the current by limiting the current in the pulse current.

The circuit protection unit 850 may include a first resistor R1 connected between the drain terminal D of the field effect transistor FET and the gate terminal G, and a gate terminal G of the field effect transistor FET. It includes a second resistor (R2) connected between the source terminal (S).

The charging and discharging unit 830 receives and charges a pulse current passing through the constant current diode through the first resistor R1, and when the charged power becomes higher than or equal to a threshold voltage (for example, 15 V or higher), the field effect transistor FET The capacitor C1 which discharges the electric current of a DC component to the gate terminal G is included.

At this time, the pulse current passing through the constant current diode is charged in the capacitor C1 through the first resistor R1 connected between the drain terminal D and the gate terminal G of the field effect transistor FET (in this case, included in the pulse current). The alternating current component passes through the capacitor and thus is not charged, only the direct current component is charged.) When the power charged in the capacitor C1 is equal to or higher than a predetermined voltage, the capacitor C1 is connected to the gate terminal G of the field effect transistor FET. A direct current component, which is a discharge current of, is applied, so that a pulse current component is removed from the current flowing through the drain terminal D-source terminal S of the conducted field effect transistor FET so that the direct current component is output. The second resistor R2 is connected between the gate terminal G and the source terminal S of the field effect transistor FET, so that the discharge current is generated by the gate terminal G and the source terminal of the field effect transistor FET. The flow is prevented from flowing to S) so that the discharge current flows only to the gate terminal G of the field effect transistor FET. This is because the capacitor C1 should be connected to both ends of the LED unit 860. If there is no second resistor R2, the power charged in the capacitor C1 flows to the source terminal S side of the field effect transistor FET. This is because the capacitor C1 cannot be charged above the desired constant voltage.

The pulsation component removing unit 840 removes the pulsation component from the pulse current from the constant current diode according to the discharge current of the DC component from the capacitor C1 of the charge / discharge unit 830 to apply a direct current to the light emitting diode unit 860. It can be implemented as a field effect transistor (FET). At this time, when the power charged in the capacitor C1 becomes equal to or higher than a constant voltage and the discharge current of the DC component is applied to the gate terminal G, the field effect transistor FET is turned on, from the constant current diode to the drain terminal D. The pulsation component is removed from the applied pulse and the direct current is applied to the light emitting diode unit 860 through the source terminal S.

The light emitting diode unit 860 may be implemented as a plurality of light emitting diodes connected in series. At this time, when a direct current is applied from the field effect transistor (FET), a plurality of light emitting diodes connected in series emits light (lights up).

Next, the power supply for the LED lamp according to the present invention and the operation method of the LED lighting device using the same in more detail as follows.

In the power supply method for the LED lamp according to the present invention, rectifying the applied AC power to output a pulse flow, the process of limiting the current to the predetermined level in the output pulse flow, the level-limited pulse flow is received through a circuit protection unit When the charge is above the threshold voltage, the method includes discharging the current of the DC component, and removing the pulsation component to remove the pulsation component in the level-limited pulse stream according to the current of the discharged DC component.

First, when an AC (AC) power supply 800 of 220V is applied to a high frequency rectifier circuit (rectifier) made of a bridge diode, the high frequency rectifier circuit (rectifier) rectifies the AC power to "AC to DC" as shown in FIG. Pulse | pulsation current (pulse current which is a direct current containing an alternating current component) "containing a component is applied to a constant current diode (constant current part).

By the way, when such a pulse is directly supplied to the LED unit 860, a rapid flicker occurs due to the pulsating component of the pulse flow to cause eye shaking.

Therefore, in the past, a smoothing circuit (see FIGS. 3 and 4) was added to remove the pulsating component mixed with the pulse stream, but this method turns on the LED unit 860 at a power factor of about 70 to 75% of the average voltage of the pulse stream. As a result, the luminance of the LED unit 860 is lowered, and power consumption is also increased.

Therefore, in the present invention, the current is limited to a certain level while passing through the constant current diode (constant current portion) of the "flow current including the alternating current component". That is, the constant current diode (constant current part) is a rectified current in the high-frequency rectifier circuit (rectification part), when a "pulse current (pulse current (DC current including AC component) with alternating current component) containing a AC component" is applied, constant current in the pulse flow The output is limited to the level. The general field effect transistor (FET) function is to control the voltage output.In the characteristic of LED, the resistance component is lowered due to the heat generation when the voltage is driven, which causes the current to continuously increase and the heat generation becomes larger, resulting in thermal runaway. The luminous intensity is very low and ultimately the function as a light emitting element is lost. In order to prevent this, a constant current diode (constant current unit) is provided to limit current.

Then, the pulse flow through the constant current diode (constant current portion) is passed through the first resistor (R1) connected between the drain terminal (D) and the gate terminal (G) of the field effect transistor (FET). Is charged.

After that, when the power charged in the capacitor C1 becomes equal to or greater than a predetermined voltage, a direct current component, which is a discharge current of the capacitor C1, is applied to the gate terminal G of the field effect transistor FET, thereby conducting the field effect. The pulsation component is removed from the current flowing from the drain terminal D to the source terminal S of the transistor FET (pulsation component removal unit) to be output as a direct current component as shown in FIG.

At this time, the capacitor C1 is used in accordance with the power consumption of the LED lamp while using a capacity of several hundred kiloohms (for example 700 Ω) to several mega ohms (for example, 2 MΩ) as the resistance value of the first resistor R1. It can be implemented using a high pressure small capacity (for example 220V, tens of kPa to tens of kPa).

The second resistor R2 is connected between the gate terminal G and the source terminal S of the field effect transistor FET so that a discharge current is generated between the gate terminal G and the source terminal S of the field effect transistor FET. ) To flow only to the gate terminal (G) of the field effect transistor (FET). In this case, the resistance value of the second resistor R2 may be implemented using a capacity of several hundred kiloohms (for example, 700 mΩ) to several megahms (for example, about 2 MΩ). Here, the resistance value may be selected according to the power consumption of the LED lamp like the capacitor.

The direct current component is applied to a plurality of light emitting diodes (LED units) connected in series to turn on the high brightness. As such, as shown in FIG. 8, the LED unit 860 is turned on at a power factor of about 85% of the average voltage of the pulse current, so that the brightness of the LED unit 860 is increased and power consumption is also reduced. do.

9 is a circuit diagram of another embodiment of a power supply for LED lamps and the LED lighting device using the same according to the present invention.

Here, the configuration of the overall power supply for the LED lamp and the LED lighting device using the same is the same as the embodiment shown in Figure 8, but the same function (pulsation component removal function) instead of the field effect transistor (FET) of Figure 8 It is implemented using an integrated circuit (IC).

That is, as shown in FIG. 9, the pulsating component removing unit 940 may be implemented as an integrated circuit (pulsating component removing integrated circuit) having a pulsating component removing function.

At this time, the capacitor C1 may be implemented using a high voltage small capacity (for example, 220V, 1μF). In addition, as shown in FIG. 9, the LED unit 860 is turned on at a power factor of 91% or more of the average voltage of the pulse current, so that the brightness of the LED unit 860 is higher, and power consumption is also lowered. do.

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, but, on the contrary, Various permutations, modifications and variations are possible without departing from the spirit of the invention.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

810: rectifying part 820: constant current part
830: charging and discharging unit 840, 940: pulsation component removal unit
850: circuit protection unit 860: LED unit

Claims (18)

In the power supply for LED (Light Emitting Diode) lighting,
Rectifier for rectifying the applied AC power to output a pulse flow;
A constant current unit for limiting current to a constant level in the pulse flow from the rectifier;
A charging and discharging unit configured to charge the pulse current through the circuit protection unit from the constant current unit and to discharge the current of the DC component when the voltage exceeds the threshold voltage;
A pulsation component removal unit for outputting a direct current by removing the pulsation component from the pulse flow from the constant current unit according to the discharge current of the direct current component from the charge / discharge unit; And
The circuit protection unit for protecting the circuit
Power supply for LED lighting including a.
The method according to claim 1,
The pulsation component removal unit,
When the discharge current of the DC component charged in the charging and discharging unit is applied to the gate terminal G, the conduction is conducted to remove the pulsation component from the pulse flow applied from the constant current unit to the drain terminal D, thereby outputting the direct current to the source terminal S. A power supply for LED lighting, which is a field effect transistor (FET).
3. The method of claim 2,
The circuit protection unit,
A first resistor connected between the drain terminal D and the gate terminal G of the field effect transistor FET; And
A second resistor connected between the gate terminal G and the source terminal S of the field effect transistor FET
Power supply for LED lighting comprising a.
The method of claim 3, wherein
The charge /
A capacitor for charging and receiving the pulsed current through the constant current through the first resistor, and discharges the current of the DC component to the gate terminal (G) of the field effect transistor (FET) when the charged power is above the threshold voltage.
Power supply for LED lighting including a.
5. The method of claim 4,
The second resistor
The current discharged from the capacitor is prevented from flowing to the gate terminal (G) and the source terminal (S) of the field effect transistor (FET) to flow only to the gate terminal (G) of the field effect transistor (FET), Power supply for LED lighting.
The method according to claim 1,
The pulsation component removal unit,
When the discharge current of the DC component charged in the charging and discharging unit is applied to the gate terminal G, the conduction is conducted to remove the pulsation component from the pulse flow applied from the constant current unit to the drain terminal D, thereby outputting the direct current to the source terminal S. Power supply for LED lighting, which is an integrated circuit (IC) for pulsating component removal.
The method according to claim 6,
The circuit protection unit,
A first resistor connected between the drain terminal (D) and the gate terminal (G) of the pulsating component removing integrated circuit (IC); And
Second resistor connected between the gate terminal (G) and the source terminal (S) of the pulsating component removal integrated circuit (IC)
Power supply for LED lighting comprising a. The method of claim 7, wherein
The charge /
The pulsed current passing through the constant current unit is charged through the first resistor, and when the charged power becomes higher than a threshold voltage, the current of the DC component is discharged to the gate terminal G of the pulsation component removing integrated circuit IC. Capacitor
Power supply for LED lighting including a.
The method of claim 8,
The second resistor
The current discharged from the capacitor is prevented from flowing to the gate terminal G and the source terminal S of the pulsation component removal integrated circuit IC, thereby preventing the current of the gate terminal G of the pulsation component removal integrated circuit IC. Power supply for LED lighting, only to flow.
In the power supply method in the power supply for LED lighting,
Rectifying the applied AC power and outputting pulse flow;
Limiting a current to a predetermined level in the output pulse;
Receiving and charging the level-limited pulse current through a circuit protection unit and discharging a current of a DC component when the voltage exceeds a threshold voltage; And
Pulsation component removal step of outputting a direct current by removing the pulsation component in the level limited pulse flow in accordance with the current of the discharged DC component
Power supply method for an LED lamp comprising a.
11. The method of claim 10,
The pulsation component removal step,
When the field effect transistor FET receives the discharge current of the discharged DC component to the gate terminal G, the field effect transistor FET conducts and removes the pulsation component from the level limited pulse flow applied to the drain terminal D, thereby applying the direct current to the source terminal S. Power supply method for LED lamps to output).
11. The method of claim 10,
The pulsation component removal step,
When the pulsation component removal integrated circuit IC receives the discharge current of the discharged DC component to the gate terminal G, the pulsation component is removed to remove the pulsation component from the level limited pulse flow applied to the drain terminal D. The power supply method for LED lighting which outputs to terminal S.
In the LED (Light Emitting Diode) lighting device,
Rectifier for rectifying the applied AC power to output a pulse flow;
A constant current unit for limiting current to a constant level in the pulse flow from the rectifier;
A charging and discharging unit configured to charge the pulse current through the circuit protection unit from the constant current unit and to discharge the current of the DC component when the voltage exceeds the threshold voltage;
A pulsation component removal unit for outputting a direct current by removing the pulsation component from the pulse flow from the constant current unit according to the discharge current of the direct current component from the charge / discharge unit;
The circuit protection unit for protecting a circuit; And
Light emitting diode unit emitting light according to the direct current from the pulsating component removing unit
LED lighting device comprising a.
14. The method of claim 13,
The pulsation component removal unit,
When the discharge current of the DC component charged in the charging and discharging unit is applied to the gate terminal G, the conduction is conducted to remove the pulsation component from the pulse flow applied from the constant current unit to the drain terminal D, thereby outputting the direct current to the source terminal S. LED lighting device, which is a field effect transistor (FET).
15. The method of claim 14,
The circuit protection unit may include a first resistor connected between the drain terminal D and the gate terminal G of the field effect transistor FET; And a second resistor connected between the gate terminal G and the source terminal S of the field effect transistor FET,
The charging and discharging unit charges the pulsed current passing through the constant current unit through the first resistor and charges the current, and when the charged power becomes higher than or equal to a threshold voltage, a current of a DC component is applied to the gate terminal G of the field effect transistor FET. A capacitor for discharging,
The second resistor prevents a current discharged from the capacitor from flowing to the gate terminal G and the source terminal S of the field effect transistor FET, thereby preventing the current from being discharged from the capacitor to the gate terminal G of the field effect transistor FET. LED lighting device to flow only).
14. The method of claim 13,
The pulsation component removal unit,
When the discharge current of the DC component charged in the charging and discharging unit is applied to the gate terminal G, the conduction is conducted to remove the pulsation component from the pulse flow applied from the constant current unit to the drain terminal D, thereby outputting the direct current to the source terminal S. LED lighting device which is an integrated circuit (IC) for pulsating component removal.
17. The method of claim 16,
The circuit protection unit may include: a first resistor connected between the drain terminal D and the gate terminal G of the pulsation component removing integrated circuit IC; And a second resistor connected between the gate terminal G and the source terminal S of the pulsation component removing integrated circuit IC.
The charging and discharging unit receives and charges a pulse current passing through the constant current unit through the first resistor, and when the charged power becomes higher than or equal to a threshold voltage, a DC component to the gate terminal G of the pulsation component removing integrated circuit IC. It includes a capacitor for discharging the current of
The second resistor prevents current discharged from the capacitor from flowing to the gate terminal G and the source terminal S of the pulsation component removal integrated circuit IC, thereby preventing the pulsation component removal integrated circuit IC. LED lighting device to flow only to the gate terminal (G).
14. The method of claim 13,
The LED illuminating device in which the said LED illuminating device was modularized and the several LED illuminating module was arranged in parallel.

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