KR102083895B1 - LED illumination device involving led-working groups - Google Patents

Abstract

An object of the present invention is to configure a plurality of LED operation unit to connect each LED operation unit in series or in parallel to operate the LED with optimum efficiency. To this end, a power supply unit for supplying input power; and a rectifier circuit unit for receiving the input power from the power supply unit to output the rectified rectified power; And at least one LED operation unit; The LED operating unit includes a plurality of LED (LED) channels connected in series and an LED unit having a resistor connected to the last end of the LED channel; and a current sensing resistor: and a plurality of switches, wherein n The switch of is connected to the rear end of the nth LED channel to control the operation of the LED channel, and the nth switch is connected by the sum of the current of the nth switch and the current of the n + 1th switch flowing through the current sensing resistor. Controlled switch circuit unit; Provided is an LED lighting device including one or more LED operating unit including a.

Description

LED illumination device involving led-working groups

The present invention relates to an LED (Light Emitting Diode) lighting device, the switch for operating the LED by the input voltage is automatically switched, including at least one LED operation unit to perform the optimal operation at both 100V and 220V, The present invention relates to an LED lighting device that solves a heat generation problem occurring in a switching IC generated when a voltage is input above a rated voltage.

Recently, LED diodes (hereinafter referred to as LEDs) have been widely used in lighting devices due to low power efficiency and long life.

In order to use an LED as a light source, a switching circuit for operating the LED according to an input voltage is required.

Conventional switching circuits include a voltage sensing circuit or a cycle sensing circuit to control a switch corresponding to the LED by sensing the magnitude of the voltage or the input period of the voltage according to the input voltage. However, since the conventional switching circuit includes a voltage sensing circuit or a periodic sensing circuit, a problem arises in that the size of the entire circuit becomes large. Therefore, the area that can further include the LED is less.

In addition, the switching circuit is composed of FETs, which are vulnerable to the invention because they are sensitive components. If the input voltage is input above the rated voltage there is a problem that a lot of heat is generated in the switching circuit. That is, when the input voltage is input above the rated voltage, a high ampere current flows through the switching circuit, causing a lot of heat generation in the switching circuit.

U.S. Patent No. US6989807 mentions a feature for driving an LED at a voltage that changes in real time by adjusting a plurality of switches connected in parallel to a plurality of LED groups connected in series at an AC input voltage whose voltage changes in real time. In addition, the US Patent US6989807 also includes a voltage sensing circuit for sensing the input voltage, the area to add the LED is small, when the rated voltage is input more than 100% generates a lot of heat generated in the switching circuit power consumption This increases the efficiency, and the high heat generated in the switching circuit increases the possibility of malfunction of the circuit.

In order to solve the conventional problems of the present invention, it is an object to configure a plurality of LED operation unit to connect each LED operation unit in series or parallel to operate the LED with optimum efficiency.

Still another object of the present invention is to provide a switching IC circuit composed of FETs by connecting a heat dissipation resistor to an LED portion to which a plurality of LEDs are connected to generate heat by dissipating heat in the resistor when a rated voltage or more is input. The goal is to protect the switching IC circuit by reducing the heat generated from the circuit.

Another object of the present invention is to put a sensing resistor to automatically switch according to the voltage generated in the sensing resistor.

Still another object of the present invention is to provide an LED in a limited area by configuring a switch circuit without configuring a voltage sensing circuit or a periodic sensing circuit for sensing an input voltage.

Other objects of the present invention will be readily understood through the following description of the embodiments.

According to an aspect of the invention, the power supply unit for supplying input power; and a rectifier circuit unit for receiving the input power from the power supply unit to output the rectified rectified power; And at least one LED operation unit; The LED operating unit includes a plurality of LED (LED) channels connected in series and an LED unit having a resistor connected to the last end of the LED channel; and a current sensing resistor: and a plurality of switches, wherein n The switch of is connected to the rear end of the nth LED channel to control the operation of the LED channel, and the nth switch is connected by the sum of the current of the nth switch and the current of the n + 1th switch flowing through the current sensing resistor. Controlled switch circuit unit; Provided is an LED lighting device including one or more LED operating unit including a.

Here, a plurality of LED operation unit and each of the LED operation unit is connected in series it can be characterized in that a brighter illumination than can be used than using one LED operation unit above a specific input voltage.

Here, the m LED operating unit and each LED operating unit is connected in parallel, it can be characterized in that it is always possible to use a light m times brighter than using one LED operating unit.

Here, the resistor unit may be connected to the last switch of the switch circuit unit, so that the resistor unit distributes and reduces heat generated from the switch circuit unit.

Here, the LED channel may be characterized by including one or more LEDs.

Here, the n-th LED channel may have a different forward voltage Vf to reduce power consumption generated by the n-th switch.

The saturation current of the n + 1 th switch may be set higher than the saturation current of the n th switch.

Here, the voltage applied to the current sensing resistor is changed by the sum of the currents flowing through the n th switch and the n + 1 th switch, and the input voltage is equal to or higher than the forward voltage Vf of the n + 1 th LED channel. In this case, when the saturation current flows through the n + 1 th switch, the n th switch may be turned off.

The present invention has the effect of maintaining the operation of the switch circuit portion composed of the IC by preventing the excessive heat generation of the switch circuit portion even when the rated voltage or more is input by configuring a resistor stage for distributing the heat generation of the switch circuit portion.

In addition, by redistributing the forward voltage of the LED channel, it is possible to reduce the power consumption generated in the switch circuit unit to increase the efficiency.

In addition, there is an effect that can automatically control the switch for driving the LED according to the input voltage.

In addition, there is an effect of providing an LED lighting device that emits brighter light at the same input voltage by connecting a plurality of LED operating unit in series or in parallel according to the size of the input voltage.

1 is a view showing the structure of an LED lighting apparatus including one LED operation unit according to an embodiment of the present invention.
2 is a diagram illustrating a structure in which the LED operating unit is connected in series according to an embodiment of the present invention.
3 is a view showing a structure in which the LED operating unit connected in parallel as an embodiment of the present invention.
4 is a view for explaining the operation of the LED operation unit according to the magnitude of the input voltage according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Nos. 1 and 2 or the terms are used only for the purpose of distinguishing one component from another. In addition, singular forms may include plural forms unless the context clearly indicates otherwise.

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

1 is a view showing the structure of an LED lighting apparatus including one LED operation unit according to an embodiment of the present invention.

The power supply unit 10 supplies input power. Since the power supply unit 10 uses an AC power source, the magnitude of the input voltage changes periodically over time.

The rectifier circuit unit 20 receives an AC input power from the power supply unit 10 and outputs the rectified rectified power.

The LED operation unit of the present invention includes the LED unit 30, the switch circuit unit 40, the current sensing resistor 50.

The LED unit 30 receives power from the rectifier circuit unit 20 to perform an operation. A plurality of (n) LED channels are connected in series and a resistance unit 35 is connected to the lower end of the last LED channel. have.

In the following description, it is assumed that n = 4 for convenience of explanation.

The switch circuit unit 40 includes a plurality of switches 41, 42, 43, 44, and 45, and the n th switch is connected to the rear end of the n th LED channel to control the operation of the LED channel, and the current sensing resistor The n th switch is controlled by the sum of the current of the n th switch and the current of the n + 1 th switch.

The current sensing resistor 50 is connected to each of the switches 41, 42, 43, 44, and 45 included in the switch circuit unit 40. Therefore, when current flows through the switch, the current flowing through the current sensing resistor 50 becomes the sum of the current flowing through the switch.

Referring to FIG. 1 as an example, the second LED channel 32 and the first switch 41 are connected to the next stage of the first LED channel 31. Next to the second LED channel 32, the third LED channel 33 and the second switch 42 are connected. Next to the third LED channel 33, the fourth LED channel 34 and the third switch 43 is connected. The resistor 35 and the switch 44 are connected to the fourth stage of the LED channel 34. The switch 5 of the resistor 35 is connected to the fifth switch 45.

Here, each switch is composed of a field effect transistor (FET). In particular, it consists of NMOS FET.

The current sensing resistor 50 is connected to each of the switches 41, 42, 43, 44, and 45 included in the switch circuit unit 40. Therefore, when current flows through the switch, the current flowing through the current sensing resistor 50 becomes the sum of the current flowing through the switch.

The current sensing resistor 50 may be configured as a variable resistor.

In the present invention, the LED channel is operated according to the size of the input power. The corresponding LED channel is operated according to the size of the rectified power input to the LED unit 30.

The operation of the switch unit 40 of the present invention is as follows.

Initially, all switches 41, 42, 43, 44, and 45 are set to a short state in which the on state is turned on.

Thereafter, the switch of the switch unit 40 is automatically controlled by the voltage value applied to the current sensing resistor 50 according to the magnitude of the rectified voltage input to the LED unit 30 to operate the LED channel.

The current sensing resistor 50 in the present invention is set to 10 ohms, for example.

Table 1 below shows the saturation current value of the switch (FET) and the voltage applied to the current sensing resistor 50 when the saturation current flows through the switch.

Here, Id means the saturation current of the switch. It means the saturation voltage when the switch is operated and current flows. Vrs means the voltage applied to the current sensing resistor 50.

Id (mA) Vrs FET 1 20 0.2 FET 2 40 0.4 FET 3 60 0.6 4 FET 80 0.8 FET 5 100 1.0

In addition, the forward voltage Vf of each LED channel is 50V.

In this case, when the input voltage rises to about 50V, the LED channel 31 is operated and the current I1 gradually flows through the switch 41. When the input voltage is 50V or more, the first switch 41 has a saturation current of 20 mA and the voltage applied to the current sensing resistor 50 becomes 0.2V.

When the input voltage rises to about 100V, LED channel 32 is activated and current I2 gradually flows through switch 42. At this time, in the current sensing resistor 50, the current flows by the sum of 20 mA which is the current flowing through the first switch 41 and the current I2 flowing through the second switch 42. Therefore, the voltage of the current sensing resistor 50 is gradually increased. When the voltage applied to the current sensing resistor 50 rises in this way, the voltage Vgs1 input to the gate of the first switch 41 is relatively lowered, so that the first switch 41 is switched from the on state to the off state. When the condition is entered, and the input voltage gradually increases and the current I2 flowing in the switch 2 increases gradually, the voltage applied to the current sensing resistor 50 gradually increases, so that the voltage value of Vgs1 is relatively low. The first switch 41 is turned off.

When the input voltage is more than 100V, switch 2 has a saturation current of 40 mA and switch 1 is completely off.

When the input voltage rises to about 150V, the LED channel 33 is operated and the current I3 gradually flows through the switch 43. At this time, in the current sensing resistor 50, the current flows by the sum of 40 mA, the current flowing through the second switch 42, and the current I3 flowing through the third switch 43. Therefore, the voltage applied to the current sensing resistor 50 is gradually increased. When the voltage applied to the current sensing resistor 50 rises in this way, the voltage Vgs2 input to the gate of the switch 2 is relatively low, so that the switch 2 is switched from the on state to the off state. When the condition is entered and the voltage value of the current sensing resistor 50 gradually increases and the voltage value of Vgs2 is relatively low, the second switch 42 is turned off.

When the input voltage is 150V or more, the third switch 43 flows a saturation current of 60 mA and the second switch 42 is completely turned off.

As described above, according to the input voltage, when the switch sequentially starts to flow current to the n + 1 switch, the n switch is turned off.

When the input voltage rises to about 200V, LED channel 34 is operated, and currents I3 and I4 gradually flow through switches 43 and 44. At this time, in the current sensing resistor 50, the current flows as much as the sum of the current flowing through the third switch 43 and 60 mA and the current flowing through the fourth switch 44 and the fifth switch 45. Similarly, when the input voltage is more than 200V, the switch 4 flows 80 mA of saturation current and the switch 3 43 is completely turned off.

However, when a voltage higher than the rated voltage is input (for example, a voltage of about 250V), switch 4 is turned off and only switch 45 operates for the same reason.

Herein, when an LED channel is connected to the resistor unit 35 instead of a resistor as in the related art, when an input voltage of more than the rated voltage is input, excessive current flows through the switch 45 so that a lot of heat is generated. do. That is, excessive current is generated in the switch that operates the last LED channel. Therefore, the excessive heat generated thus badly affects the switch circuit portion 40 composed of IC components, resulting in a decrease in efficiency due to failure of the components and generated heat.

Therefore, as in the present invention, when the resistance unit 35 is connected to the last end of the LED unit 30 and the voltage is distributed in the resistor unit 35, when the rated voltage or more is input, the switch No. 5 occurs at switch 45. By distributing the heat to the resistor unit 35, it blocks the excessive heat generated in the switch 45. By doing so, in the present invention, even when the input voltage is input above the rated voltage, excessive heat generated in the switch circuit unit 40 is partially distributed by the resistor unit 35 to generate heat, thereby causing excessive heat in the switch circuit unit 40 composed of the IC. It is possible to reduce the occurrence of this can maintain the stability of the switch circuit portion (40).

In addition, the present invention may have the following features in terms of power consumption.

From switch 1 to switch 4, when the input voltage rises, the voltage is canceled by forward voltage in LED channel n, and switch n is operated with the remaining voltage, and switch n is turned off when more voltage is input. As the n + 1 switch operates, the power (heat) consumed by each switch increases, but the overall power consumption is within a certain system specification range. However, the fifth switch 45, which is the last switch, when the rated voltage or more is input, excessive current flows, and the consumed power (heat) exceeds the range of the system standard. Therefore, when the rated voltage or more is input, the fifth switch 45 generates excessive heat.

According to the present invention, even when a rated voltage or more is input by providing the resistor unit 35, heat generated in the switch 45 may be canceled by generating heat in the resistor unit 35.

In addition, in the present invention, by redistributing the forward voltage Vf of each LED channel differently, the power consumed by each switch can be made almost the same. In other words, by increasing the forward voltage Vf of the n + 1th LED channel than the forward voltage Vf of the nth LED channel, the power consumed by the nth and n + 1th switches can be made almost equal. . By redistributing the forward voltage Vf of the LED channel in this way, even when the input voltage changes, the heat generated by the switch circuit unit 40 can be the same.

Here, the forward voltage Vf may be freely changed for each LED channel, but the sum of all forward voltages Vf is set to match the maximum value of the input voltage.

2 is a view showing a structure in which the LED operating unit connected in series as an embodiment of the present invention.

In the present invention can be configured by connecting the LED operation unit in series as shown in FIG.

2 shows an LED lighting device including two LED operation units 100 and 200 connected in series with each other.

Each LED operation unit 100 and 200 includes an LED unit 30, a switch circuit unit 40, and a current sensing resistor 50 as described above with reference to FIG. 1.

As shown in FIG. 2, when the LED operating units 100 and 200 are connected in series, the maximum voltage of the input voltage is referred to as Vmax, and the same forward voltage is applied to the LED units of the first LED operating unit 100 and the second LED operating unit 200. When using an LED having Vf, the first LED operation unit 100 performs a switching operation within a range of (1/2) * Vmax of the input voltage, and the second LED operation unit 200 performs the The switching operation is performed at a voltage of 1/2) * Vmax or more.

If the maximum value of the input voltage is 220V, when the input voltage is within 110V, the switching operation of the LED unit 30 and the switch circuit unit 40 of the first LED operation unit 100 is operated as described above with reference to FIG. To perform.

That is, when the input voltage is between 110V and 220V, all LED channels of the first LED operating unit 100 operate to emit light, and the switching of the LED unit 30 and the switch circuit unit 40 of the second LED operating unit 200 is performed. The operation performs the operation as described above in FIG.

If LEDs having different forward voltages Vf are used in the LED portions of the first LED operating portion 100 and the second LED operating portion 200, the input voltages of the respective LED operating portions 100 and 200 operate. The range of is dependent on the size of the forward voltage (Vf) each LED operating unit (100,200) has.

When the LED operation units 100 and 200 are connected in series, as shown in FIG. 2, when the input voltage is greater than or equal to a predetermined voltage, twice the brightness may be used than using one LED operation unit.

3 is a view showing a structure in which the LED operating unit connected in parallel as an embodiment of the present invention.

In the present invention, the LED operating unit can be configured by connecting in parallel as shown in FIG.

3 illustrates an LED lighting device including two LED operation units 300 and 400 connected in parallel to each other.

Each of the LED operation units 300 and 400 includes the LED unit 30, the switch circuit unit 40, and the current sensing resistor 50, as described above with reference to FIG. 1. The switching operation of the switch circuit unit 40 and the operation of the LED unit 30 are the same as described above with reference to FIG.

When the LED operating units 300 and 400 are connected in parallel as shown in FIG. 3, LEDs having the same forward voltage Vf are used for the LED units of the first LED operating unit 300 and the second LED operating unit 400. In this case, the first LED operating unit 300 and the second LED operating unit 400 independently perform the same operation at the same input voltage according to the magnitude of the input voltage (V).

That is, the switching operation of the LED unit 30 and the switch circuit unit 40 of the first LED operating unit 300 and the LED unit 30 and the switch circuit unit 40 of the second LED operating unit 400 within the same input voltage range. The switching operation of) performs the same operation as described above with reference to FIG. 1.

If LEDs having different forward voltages Vf are used in the LED portions of the first LED operating portion 300 and the second LED operating portion 400, the input voltages at which the respective LED operating portions 300 and 400 operate. The range of is dependent on the magnitude of the forward voltage (Vf) each LED operating unit (300, 400) has.

As shown in FIG. 3, when the LED operating units 300 and 400 are connected in parallel, the LED operating units 300 and 400 have twice the brightness as compared to using one LED operating unit in the same power supply.

4 is a view for explaining the operation of the LED operation unit according to the magnitude of the input voltage according to an embodiment of the present invention.

V1 is called the magnitude of the input voltage at which all the LED channels of the first LED operating part operate, and V2 is called the maximum value of the input voltage.

If the first LED operating unit 100 and the second LED operating unit 200 are connected in series as shown in FIG. 2, only the first LED operating unit 100 operates as described in FIG. 1 when the input voltage is within V1. Done. When the input voltage is greater than or equal to V1, all LED channels of the LED unit 30 of the first LED operating unit 100 operate (light emission), and the second LED operating unit 200 according to the magnitude of the input voltage. It operates as described in FIG.

Therefore, in the section A, only the first LED operating unit 100 performs the switching operation as described above in FIG. 1 so that the corresponding LED channel operates according to the magnitude of the input voltage. In the period B, all the LED channels of the first LED operating unit 100 perform an operation, and only the second LED operating unit 200 performs the switching operation as described above with reference to FIG. It will work.

3, when the first LED operating unit 300 and the second LED operating unit 400 is connected in parallel, the first LED operating unit 300 and the second LED operating unit 400 according to the magnitude of the input voltage The same operation as described in FIG. 1 is performed in the same input voltage.

The LED lighting device of the present invention configured as described above has the following advantages.

① It is possible to automatically switch the FET switch according to the input voltage without configuring the input voltage sensing circuit or the input cycle sensing circuit.

② The switch circuit can be easily configured, so extra LED channels can be added for the same area.

③ It can increase the efficiency of switch circuit part by adjusting forward voltage (Vf) for each LED channel and can freely combine LEDs.

④ If a plurality of LED operating units are connected in series, n times the brightness can be used in the section where the nth LED operating unit performs operation than when only one LED operating unit is used.

⑤ When m LEDs are connected in parallel, m times the brightness is always available regardless of the magnitude of input voltage than when only one LED is used.

Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

10: power supply unit 20: rectifier circuit unit
30: LED part 31, 32, 33, 34: LED channel
35 resistance unit 40 switch circuit unit
41, 42, 43, 44, 45: switch 50: current sense resistor
100, 300: first LED operating part
200, 400: second LED operating part

Claims (18)

delete delete delete delete delete delete delete delete delete delete It includes a first LED operation unit and a second LED operation unit connected in parallel to each other,
Each of the first LED operation unit and the second LED operation unit may include: an LED unit including a plurality of LED channels and one resistor element; And a switch circuit unit including a plurality of switches,
The n th switch of the plurality of switches is connected to a rear end of the n th LED channel of the plurality of LED channels, the other end of the plurality of switches is connected to a current sensing resistor, and the switching of the n th switch is the current sensing. It is controlled by the sum of the current of the n th switch and the current of the n + 1 th switch flowing through the resistance, characterized in that the resistance element is connected between the last LED channel of the plurality of LED channels and the last switch of the plurality of switches LED lighting device. The LED lighting apparatus of claim 11, wherein the plurality of LED channels of the first LED operating unit are connected to each other in series and operated with a rectified power rectified from the rectifying circuit unit by receiving input power from a power supply unit. A first LED operator and a second LED operator connected in series with each other,
Each of the first LED operation unit and the second LED operation unit may include: an LED unit including a plurality of LED channels and one resistor element; And a switch circuit unit including a plurality of switches,
The kth switch of the plurality of switches is connected to the rear end of the kth LED channel of the plurality of LED channels, the other end of the plurality of switches is connected to the current sensing resistor, the switching of the kth switch is the current sensing Controlled by the sum of the current of the kth switch and the current of the k + 1th switch flowing through the resistor, wherein the resistance element is connected between the last LED channel of the plurality of LED channels and the last switch of the plurality of switches,
And the other end of the current sensing resistor of the first LED operating unit is connected to a first LED channel of the plurality of LED channels of the second LED operating unit. delete 12. The LED lighting device of claim 11, wherein the switch comprises a FET. The LED lighting apparatus of claim 12, wherein a first LED channel of the plurality of LED channels of the first LED operating unit is connected to the rectifier circuit unit. The LED lighting apparatus of claim 11, wherein the current sensing resistor comprises a variable resistor. The LED lighting apparatus of claim 11, wherein the switch of the switch circuit unit is automatically operated by a current sensing resistor and a voltage flowing in the LED channel.

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