KR20140100387A - LED illumination device for protecting switching circuit using current control - Google Patents

Abstract

An objective of the present invention is to protect a switch circuit unit by measuring a temperature of the switch circuit unit through a temperature sensor, and controlling a current flowing in the switch circuit unit when the temperature of the switch circuit unit becomes higher than a preset temperature. To this end, provided is an LED lighting apparatus for protecting the switching circuit unit through a current control, which includes a power source unit to supply an input voltage; a rectifying circuit unit to receive the input voltage from the power source unit and to output rectified power; an LED unit having a plurality of serially connected LED channels and a resistor connected to a last end of the LED channels; a current sensing resistor; the switch circuit unit having a plurality of switches, in which an nth switch is connected to a rear end of an nth LED channel to control an operation of the LED channel, and the nth switch is controlled by a sum of a current of the nth switch and a current of an n+1th switch flowing through the current sensing resistor; and a current control unit having the temperature sensor to measure a temperature of the switch circuit unit and to control the current flowing through the switch circuit unit according to the temperature of the switch circuit unit.

Description

[0001] The present invention relates to an LED illumination device for protecting a switch circuit by current control.

The present invention relates to an LED (Light Emitting Diode) lighting apparatus, in which a switch for operating an LED by an input voltage is automatically switched, a temperature of a switching circuit unit is measured through a temperature sensor, To a lighting apparatus that controls the current of the switching circuit unit to protect the switching circuit unit.

In recent years, LED diodes (hereinafter referred to as LEDs) have been widely used in lighting devices due to their low power, high efficiency and long service life.

To use the LED as a light source, a switching circuit that operates the LED according to the input voltage is needed.

The conventional switching circuit includes a voltage sensing circuit or a period sensing circuit, and controls a switch corresponding to the LED by sensing a voltage level or a voltage input period according to an input voltage. However, since such a conventional switching circuit includes a voltage sensing circuit or a period sensing circuit, there arises a problem that the size of the entire circuit increases. Therefore, the area that can further include the LED is reduced.

In addition, the switching circuit is composed of FETs. Such FETs are susceptible to the invention because they are sensitive components. Here, when the input voltage is inputted at a rated voltage or more, there is a problem that a lot of heat is generated in the switching circuit. That is, when the input voltage is inputted at a rated voltage or higher, a high amperage current flows to the switching circuit, which causes a problem that a large amount of heat is generated in the switching circuit.

U.S. Patent No. 6,989,807 discloses a feature in which LEDs can be driven at a voltage varying in real time by adjusting a plurality of switches connected in parallel to a plurality of LED groups serially connected at an AC input voltage varying in voltage in real time , US Patent No. 6,989,807 also includes a voltage sensing circuit for sensing the input voltage. When the rated voltage is 100% or more, an excessive amount of heat is generated in the switching circuit, The efficiency is lowered, and the possibility of malfunction of the circuit due to the high heat generated in the switching circuit is increased.

In order to solve the conventional problems of the present invention, it is desirable to measure the temperature of the switch circuit portion by providing a temperature sensor and to protect the switch circuit portion by controlling the current flowing through the switch circuit portion when the temperature of the switch circuit portion exceeds the set temperature to be.

It is a further object of the present invention to provide a switch circuit unit comprising FETs by connecting a resistor for heat dissipation to an LED unit to which a plurality of LEDs are connected, The purpose is to reduce the generated heat and protect the switch circuit part.

It is still another object of the present invention to provide a sensing resistor to automatically switch according to a voltage generated in a sensing resistor.

It is still another object of the present invention to provide a switch circuit unit without configuring a voltage sensing circuit or a periodic sensing circuit for sensing an input voltage so that an LED can be additionally formed in a limited area.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a power supply unit for supplying an input voltage; a rectifying circuit unit for receiving a rectified input power from the power supply unit and outputting rectified rectified power; And the nth switch is connected to the rear end of the nth LED channel to control the operation of the LED channel, and the nth switch controls the operation of the LED channel, A switch circuit part for controlling the nth switch by a sum of a current of an nth switch flowing in a current sensing resistor and a current of an (n + 1) th switch; And a temperature sensor to measure a temperature of the switch circuit unit and to control a current flowing in the switch circuit unit according to a temperature of the switch circuit unit; And an LED lighting device which protects the switch circuit portion through current control including the light emitting diode.

Here, the switch circuit portion includes a switch connected to the resistor portion, so that the resistor portion distributes and reduces heat generated in the switch circuit portion.

Here, the LED channel may include one or more LEDs.

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

Here, the saturation current of the (n + 1) th switch is set higher than the saturation current of the nth switch.

Here, the voltage of the current sensing resistor is changed by the sum of the currents flowing in the neighboring nth and n + 1th switches, and the input voltage is greater than or equal to the forward voltage Vf of the n + 1th LED channel And when the saturation current flows to the (n + 1) th switch, the nth switch is turned off.

Here, the malfunctioning temperature is set in the current control unit, and when the current control unit measures the temperature of the switch circuit unit, the current control unit controls the switches to prevent the current from flowing to the switch circuit unit . ≪ / RTI >

The present invention has an effect of protecting the switch circuit portion by controlling the current flowing through the switch circuit portion when the temperature of the switch circuit portion is out of the normal operation range by monitoring the temperature of the switch circuit portion by providing a temperature sensor.

Further, by constituting the resistor stage which distributes the heat of the switch circuit portion, it is possible to prevent excessive heat generation of the switch circuit portion even when a rated voltage or higher is inputted, thereby normally maintaining the operation of the switch circuit portion constituted by the IC.

Further, there is an effect that the forward voltage of the LED channel is redistributed to reduce the power consumed in the switch circuit portion, thereby increasing the efficiency.

Further, there is an effect that the switch for driving the LED can be automatically controlled according to the input voltage.

FIG. 1 is a diagram illustrating a structure of an LED lighting device for protecting a switch circuit portion through current control according to an embodiment of the present invention. Referring to FIG.
2 is a diagram illustrating a current flowing through an LED channel according to an input voltage according to an exemplary embodiment of the present invention.
FIG. 3 is a diagram illustrating control of the temperature of the switch control unit by controlling the current of the switch circuit unit according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. First and second or the above terms are used only for the purpose of distinguishing one element from another. Also, the singular expressions may include plural expressions unless the context clearly dictates otherwise.

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

FIG. 1 is a diagram illustrating a structure of an LED lighting device for protecting a switch circuit portion through current control according to an embodiment of the present invention. Referring to FIG.

The LED lighting apparatus for protecting the switch circuit unit through the current control of the present invention includes a power supply unit 10, a rectifier circuit unit 20, an LED unit 30, a switch circuit unit 40, a current sensing resistor 50 and a current control unit 60 ).

The power supply unit 10 supplies an input voltage.

The rectifying circuit section 20 receives the input voltage of the AC from the power supply section 10 and outputs rectified rectified power.

The LED unit 30 includes n LED channels connected in series and a resistor unit 35 is connected to the last end of the last LED channel 34. [

For convenience of explanation, it is assumed that n = 4.

In FIG. 1, the LED unit 30 includes four LED channels 31, 32, 33, and 34. The resistor unit 35 is connected to the next stage of the last LED channel 34 of the LED channel connected in series with each other.

The switch circuit unit 40 includes five switches for operating the LED channel according to the input power source. Here, the first to fourth switches control the operation of the LED channel in accordance with the input power, and the fifth switch operates the resistor unit 35.

Referring to FIG. 1, the second LED channel 32 and the first switch 41 are connected to the next end of the first LED channel 31. The third LED channel 33 and the second switch 42 are connected to the next stage of the second LED channel 32. [ And the fourth LED channel 34 and the third switch 43 are connected to the next stage of the third LED channel 33. [ The resistor unit 35 and the fifth switch 44 are connected to the next stage of the fourth LED channel 34. [ The fifth switch 45 is connected to the next stage of the resistor 35. [

Here, each of the switches is composed of a FET (Field Effect Transistor). In particular, it is composed of an NMOS FET.

The current sensing resistor 50 may be constituted by a variable resistor.

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

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

Initially, the operating voltage is input so that the respective switches can operate on the gates of all the switches 41, 42, 43, 44, and 45 (i.e., the current flows).

When the operation voltage of the first switch 41 is Vgs1, the operation voltage of the second switch 42 is Vgs2, the operation voltage of the third switch 43 is Vgs3, the operation voltage of the fourth switch 44 is Vgs4, The operation voltage of the fifth switch 45 is Vgs5.

Here, the following condition is satisfied: Vgs1 <Vgs2 <Vgs3 <Vgs4 <Vgs5.

Each of Vgs1, Vgs2, Vgs3, Vgs4, and Vgs5 is connected to the current sensing resistor 50 and is affected by the voltage applied to the current sensing resistor 50. [

The switch of the switch circuit 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.

In the present invention, when a current flows in both neighboring switches, a voltage is generated in the current sensing resistor due to the sum of the currents flowing in the two neighboring switches, and the operating voltage Which means that the switch with the lower operating voltage is turned off first.

The switch of the switch circuit 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.

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

Table 1 shows the saturation current value according to the switch (FET) and the voltage across the current sensing resistance when the saturation current flows through the switch.

Here, Id denotes saturation current of the corresponding switch. Means a saturated voltage when a switch operates and current flows. Vrs refers to the voltage across the current sensing resistor.

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

It is also assumed that the forward voltage Vf of each LED channel is 50V.

In this case, when the input voltage rises to reach about 50 V, the first LED channel 31 operates and the current I1 flows slowly through the first switch 41. When the input voltage exceeds 50 V, the saturation current of 20 mA flows in the first switch 41 and the voltage applied to the current sensing resistor 50 becomes 0.2V.

When the input voltage rises to reach 100 V, the second LED channel 32 operates and the current I2 flows slowly through the second switch 42. At this time, in the current sensing resistor 50, the current flows by the sum of the current flowing in the first switch 41 and the current I2 flowing in 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, the voltage Vgs1 input to the gate of the first switch 41 becomes relatively low, so that the first switch 41 is switched from the on state to the off state. When the input voltage gradually increases and the current I2 flowing in the second switch 42 gradually increases, the voltage applied to the current sensing resistor 50 gradually increases and the voltage value of Vgs1 is relatively low So that the first switch 41 is turned off.

When the input voltage becomes 100 V or more, the second switch 42 has a saturation current of 40 mA and the first switch 41 is completely turned off.

When the input voltage rises to reach about 150 V, the third LED channel 33 operates and the current I3 gradually flows through the third switch 43. At this time, in the current sensing resistor 50, a current flows as much as the sum of the current flowing in the second switch 42 and the current I3 flowing in 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, the voltage Vgs2 input to the gate of the second switch 42 becomes relatively low, so that the second switch 42 is switched from the on state to the off state. And when the voltage value of the current sensing resistor 50 gradually increases and the voltage value of Vgs2 becomes relatively low, the second switch 42 is turned off.

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

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

When the input voltage rises to reach 200 V, the fourth LED channel 34 operates and the currents I3 and I4 flow slowly through the third switch 43 and the fourth switch 44. [ At this time, the current flows through the current sensing resistor 50 by the sum of the current flowing through the third switch 43 and the current flowing through the fourth switch 44 and the fifth switch 45. Likewise, when the input voltage becomes 200 V or more, the fourth switch 44 is supplied with a saturation current of 80 mA and the third switch 43 is completely turned off.

However, when a voltage higher than the rated voltage is input (for example, about 250 V), the fourth switch 44 is turned off and the fifth switch 45 is operated only for the same reason.

Assuming that the LED is connected to the resistor 35 instead of the resistor as in the conventional case, when an input voltage higher than the rated voltage is inputted, an excessive current flows to the switch 45, and a lot of heat is generated . That is, excessive current is generated in the switch for operating the last LED channel. Therefore, excessive heat generated in this way has a considerably bad influence on the switch circuit portion 40 composed of the IC parts, resulting in a failure of the component and a reduction in efficiency due to the generated heat.

Therefore, when the resistor 35 is connected to the last end of the LED 30 as in the present invention and the voltage is divided by the resistor 35, The heat generated by the fifth switch 45 is prevented from being excessively generated. Thus, in the present invention, even when the input voltage is inputted at a rated voltage or higher, excessive heat is not generated in the switch circuit portion 40, and the stability of the switch circuit portion 40 constituted by the IC can be maintained.

The current control unit 60 includes a temperature sensor.

The current control unit 60 uses the temperature sensor to measure the temperature of the switch circuit unit 40 and controls the current flowing to the switch circuit unit 40 in accordance with the measured temperature of the switch circuit unit 40. [

In addition, the current control unit 60 includes a storage device such as a memory, so that a normal operation temperature range in which the switch circuit unit 40 can operate normally may be set.

The current control unit 60 measures the temperature of the switch circuit unit 40 using a temperature sensor and when the measured temperature of the switch circuit unit 40 is out of the normal operating temperature range, 41, 42, 43, 44, 45) to control the current flowing through the switch circuit section 40.

For example, if the normal operating temperature range set in the current control unit 60 is 0 to 80 degrees Celsius and the measured temperature of the switch circuit unit 40 is 85 degrees Celsius, the measured temperature of the switch circuit unit 40 is The current controller 60 turns off a switch (that is, a switch through which current flows) of the switches 41, 42, 43, 44, and 45 of the switch circuit unit 40, State so that current does not flow through the switch circuit section 40. [

2 is a diagram illustrating a current flowing through an LED channel according to an input voltage according to an exemplary embodiment of the present invention.

As described above with reference to FIG. 2, each of the LED channels 31, 32, 33, and 34 is supplied with a saturated current when more than the forward voltage Vf is input according to the input voltage.

The section a in FIG. 2 is a section in which an input voltage for operating the first LED channel 31 is input. Therefore, the current I1 flows through the first LED channel 31 and the first switch 41 in the section where the input voltage is a.

and the period b is a period during which the input voltage for operating the second LED channel 32 is input. Accordingly, the current I2 flows through the second LED channel 32 and the second switch 42 during the period when the input voltage is b.

and the period c is a period during which the input voltage for operating the third LED channel 33 is input. Accordingly, the current I3 flows through the third LED 33 and the third switch 43 during the period when the input voltage is c.

The d period is a period during which the input voltage for operating the fourth LED channel 34 is input. Accordingly, in the section where the input voltage is d, the current of I4 flows through the fourth LED 34 and the fourth switch 44. [

2, the first switch is operated to operate the first LED channel, the second switch operates to operate the first LED channel and the second LED channel, and the third switch operates the third switch, The first LED channel, the second LED channel, and the third LED channel operate. In the d period, the fourth switch operates to operate the first LED channel, the second LED channel, the third LED channel, and the fourth LED channel.

Here, I4 is a current flowing to the switch control unit 40 when the input voltage is inputted near 100% of the rated voltage. That is, the current flowing through the fourth switch 44.

Here, if a voltage higher than the rated voltage (that is, a voltage equal to or higher than 100% of the rated voltage) is input, the current I5 flows through the fifth switch 45.

In FIG. 2, when the input voltage is inputted within 100% of the rated voltage, the current flowing in the LED unit 30 and the switch control unit 40 changes stepwise according to the input voltage as shown in FIG.

FIG. 3 is a diagram illustrating control of the temperature of the switch control unit by controlling the current of the switch circuit unit according to an embodiment of the present invention.

The dotted line of the semicircle at the lower end of FIG. 3 represents the input voltage, and the solid line of the stepped line represents the current of the switch circuit 40 according to the input voltage.

As described above with reference to FIG. 2, since the LED channel to be operated varies according to the interval of the input voltage, the switch for operating the LED channel also changes.

The current flows to the switch circuit section 40 except for the voltage section in which the input voltage can not operate the first LED channel, so that the temperature of the switch circuit section 40 increases with the input voltage.

However, when the temperature of the switch circuit unit 40 continuously increases and the temperature exceeds a certain instant, the switch circuit unit 40 may be damaged due to heat generation or may malfunction.

Therefore, in the present invention, the temperature of the switch circuit unit 40 is measured. When the temperature of the switch circuit unit 40 is above the normal operating temperature, the current flowing through the switch circuit unit 40 is cut off to lower the temperature of the switch circuit unit 40.

A method of lowering the temperature by interrupting the current of the switch circuit portion 40 according to the temperature of the switch circuit portion 40 will be described with reference to FIG.

First, it is assumed that the range of the normal operating temperature of the switch circuit portion is within T2, and it is assumed that the malfunctioning temperature causing the malfunction of the switch circuit portion or causing the malfunction is T1. It is assumed that the malfunctioning temperature T1 is set in the current control unit 60. [

When the input voltage is inputted to the LED unit 30 and the current starts to flow in the switch circuit unit 40, the temperature of the switch circuit unit 40 rises as shown in Fig.

When the temperature of the switch circuit unit 40 rises to reach the normal operating temperature T2 or higher and reaches the malfunctioning temperature T1, the current control unit 60 controls the switch of the current flowing through the switch control unit 40 to cut off the current. Then, when the temperature of the switch control unit 40 drops to be lower than the normal operation temperature T2, the current control unit 60 controls the switch according to the input voltage to operate the LED channel corresponding to the input voltage . Thereafter, when the temperature of the switch circuit portion 40 rises and reaches the normal operation temperature T2 or higher to reach the malfunctioning temperature T1, the current control portion 60 controls the switch of the current flowing through the switch control portion 40 to shut off the current And the temperature of the switch control unit 40 drops to T2 below the normal operating temperature, the current control unit 60 operates the LED channel corresponding to the input voltage again.

The operation of the current control unit 60 will be described with reference to FIG. 3 as follows.

The current control unit 60 controls the third switch 43 through which the I3 current flows to interrupt the I3 current at the point 1 where the input voltage is input and the temperature of the switch control unit 40 rises and reaches the malfunctioning temperature T1. The current control unit 60 controls the first switch 41 corresponding to the input voltage at this time to turn on the I1 current at the point 2 where the temperature of the switch control unit 40 falls and reaches the normal operating temperature T1 .

Thereafter, at the point 3 where the temperature of the switch control unit 40 rises and reaches the malfunctioning temperature T1, the current control unit 60 controls the first switch 41 to block the current I1 from flowing. The current control unit 60 controls the third switch 43 corresponding to the input voltage at this time to reach the normal operating temperature T1 at which the temperature of the switch control unit 40 is lowered to flow the I3 current .

Thereafter, the current controller 60 controls the fourth switch 44 at the point 5 where the temperature of the switch controller 40 reaches the malfunctioning temperature T1 and blocks the current I4 from flowing. The current control unit 60 controls the switch corresponding to the input voltage at the point 6 to reach the normal operating temperature T1, the temperature of the switch control unit 40 being lowered to allow the current to flow.

In addition, the present invention can have the following characteristics in terms of power consumption.

When the input voltage rises from the first switch to the fourth switch, the voltage is canceled by the forward voltage in the n-th LED channel and the n-th switch is operated with the remaining voltage. When the voltage higher than the forward voltage is inputted, (N + 1) switches are operated. Therefore, the power consumed by each switch increases, but the overall power consumption is within a predetermined system specification range. However, when the fifth switch 45, which is the last switch, receives a rated voltage or more, excessive current flows and the consumed power (heat) exceeds the specification range of the system. Therefore, when the rated voltage or more is inputted, the fifth switch 45 generates excessive heat.

In the present invention, even when a resistor unit 35 is provided and a rated voltage or more is inputted, the heat generated in the fifth switch 45 can be canceled by generating heat in the resistor unit 35.

Also, in the present invention, the forward voltage Vf of each LED channel is redistributed differently, so that power consumed by each switch can be made almost equal. That is, the forward voltage Vf of the (n + 1) -th LED channel is made higher than the forward voltage Vf of the nth LED channel, and the powers consumed by the nth and (n + 1) . By redistributing the forward voltage Vf of the LED channel in this way, even when the input voltage changes, the heat generated in the switch circuit 40 can be made equal.

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

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

① By connecting a temperature sensor, measure the temperature of the switch circuit section composed of IC and control the current flowing in the switch circuit section, so that the temperature of the switch circuit section is always protected against the malfunctioning temperature.

② Switching of FET switch can be performed automatically according to input voltage without configuring input voltage sensing circuit or input period sensing circuit.

③ Since the switch circuit can be easily configured, extra LED channels can be added for the same area.

(4) By rearranging the forward voltage Vf for each LED channel, it is possible to increase the efficiency of the switch circuit and to perform a combination of free LEDs.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: power supply unit 20: rectifying circuit unit
30: LED part 31, 32, 33, 34: LED channel
35: Resistor section 40: Switch circuit section
41, 42, 43, 44, 45: Switch 50: Current sensing resistance
60:

Claims (7)

A power supply unit for supplying an input voltage;
A rectifying circuit part for receiving an input voltage from the power supply part and outputting rectified rectified power;
An LED unit having a plurality of LED channels connected in series and a resistor unit connected to a last end of the LED channel;
Current sensing resistor;
And the nth switch is connected to the rear end of the nth LED channel to control the operation of the LED channel, and the current of the nth switch flowing in the current sensing resistor and the current of the n + 1th switch A switch circuit portion in which an nth switch is controlled by the sum of the nth switches; And
A current controller including a temperature sensor for measuring a temperature of the switch circuit and controlling a current flowing in the switch circuit according to a temperature of the switch circuit; Wherein the switch circuit portion is protected by a current control circuit including the switch circuit portion.
The method according to claim 1,
Wherein the switch circuit portion includes a switch connected to the resistor portion, and the resistor portion distributes and reduces heat generated in the switch circuit portion, thereby protecting the switch circuit portion through the current control.
The method according to claim 1,
Wherein the LED channel includes one or more LEDs to protect the switch circuit unit through current control.
The method according to claim 1,
Wherein the plurality of LED channels have different forward voltages (Vf) in order to reduce power consumption occurring in the switches.
The method according to claim 1,
and the saturation current of the (n + 1) th switch is set higher than the saturation current of the nth switch.
The method according to claim 1,
The voltage of the current sensing resistor is changed by the sum of currents flowing through the neighboring nth switch and the (n + 1) th switch,
And the nth switch is turned off when the input voltage is equal to or greater than the forward voltage Vf of the (n + 1) th LED channel and a saturation current flows through the (n + 1) th switch. An LED lighting device protecting the circuit part.
The method according to claim 1,
The malfunctioning temperature is set in the current control section and the current control section controls the switches when the temperature of the switch circuit section becomes the malfunctioning temperature or more as a result of measuring the temperature of the switch circuit section so that current does not flow in the switch circuit section And the protection circuit is protected by the current control.

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