KR20110010392A - Device for driving lamp - Google Patents

Device for driving lamp Download PDF

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Publication number
KR20110010392A
KR20110010392A KR1020090067937A KR20090067937A KR20110010392A KR 20110010392 A KR20110010392 A KR 20110010392A KR 1020090067937 A KR1020090067937 A KR 1020090067937A KR 20090067937 A KR20090067937 A KR 20090067937A KR 20110010392 A KR20110010392 A KR 20110010392A
Authority
KR
South Korea
Prior art keywords
lamp
current
electrically connected
unit
transformer
Prior art date
Application number
KR1020090067937A
Other languages
Korean (ko)
Inventor
조익현
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020090067937A priority Critical patent/KR20110010392A/en
Publication of KR20110010392A publication Critical patent/KR20110010392A/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

An embodiment of the present invention relates to a lamp driving device.

Lamp driving apparatus according to an embodiment of the present invention is electrically connected to the power supply and the lamp unit is operated by receiving the power supplied from the power supply, the lamp unit is electrically connected to the lamp unit and controls the lamp current supplied to the lamp unit It includes a lamp current balancer for maintaining the current balance and a lamp current sensing unit for sensing the lamp current.

Transformer, external electrode fluorescent lamp, balance

Description

Lamp drive unit {DEVICE FOR DRIVING LAMP}

Embodiments relate to a lamp driving apparatus.

In general, since the liquid crystal display does not emit light by itself, a separate light source called a backlight is required, and such a backlight includes a light emitting diode (LED) and a cold cathode fluorescent lamp (CCFL). External Electrode Fluorescent Lamps (EEFLs) are used.

In this case, a cold cathode fluorescent lamp (CCFL) in parallel driving has a problem in that all lamps do not flow uniform current due to the negative resistance of the lamps.

An object of the present invention is to provide a lamp driving device that can reduce the current deviation of the lamp current supplied to the lamp unit.

The lamp driving apparatus according to the embodiment is a lamp unit electrically connected to the power supply unit and operated by receiving power supplied from the power supply unit, and a lamp current balanced by controlling a lamp current electrically connected to the lamp unit and supplied to the lamp unit. Lamp current balance unit for maintaining the lamp current sensing unit for sensing the lamp current.

The lamp driving apparatus according to the embodiments has the effect of efficiently reducing the current deviation of the lamp current by disposing a lamp current balancer including a transformer of a different phase.

In addition, the lamp driving apparatus according to the embodiments has the effect that the lamp unit and the lamp current sensing unit is electrically connected in series to easily detect the lamp current for each lamp.

In addition, the lamp driving apparatus according to the embodiment is electrically connected in series with the lamp current balance unit and the lamp unit and the lamp current sensing unit including a transformer of a different phase, so that errors can be easily detected even in the event of a failure, thereby providing reliability of the product. There is an effect to improve.

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

1 is for explaining a lamp driving apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the lamp driving apparatus 100 according to the exemplary embodiment includes a lamp unit 120, a lamp current balancer 130, and a lamp current sensing unit 140.

The lamp unit 120 is electrically connected to the power supply unit 110 and operates by receiving power provided from the power supply unit 110. The lamp unit 120 may include first lamps Lamp1 to fourth lamps Lamp4. The lamp unit 120 receives power from the power supply unit 110 to turn on or turn off. In this case, the lamp unit 120 may be configured as an external electrode fluorescent lamp (EEFL) or a cold cathode fluorescent lamp (CCFL). The power supply unit 110 is configured to include a first power supply (V1) and a second power supply (V2). The first power supply unit V1 and the second power supply unit V2 may supply substantially the same power.

The lamp current balance unit 130 is electrically connected to the lamp unit 120 and controls the lamp current supplied to the lamp unit 120 to maintain the balance of the lamp current. The lamp current balancer 130 may include first transformer T1 to third transformer T3. At this time, the lamp current balancer 130 detects and controls the first to fourth lamp currents supplied to the first to fourth lamps Lamp1 to Lamp4, respectively. It is such that substantially the same lamp current is supplied to the four lamps Lamp4.

At this time, the phase of the first transformer T1 is opposite to the phase of the second transformer T2, and the phase of the second transformer T2 is the same phase as that of the third transformer T3. . As described above, since the phase of the first transformer T1 has a phase opposite to that of the second transformer T2 and that of the third transformer T3, the first lamps Lamp1 to fourth lamps ( It is possible to easily reduce the current deviation of the lamp current supplied to Lamp4).

The lamp current sensing unit 140 senses a lamp current. The lamp current sensing unit 140 may include a first sensing resistor R1 and a fourth sensing resistor R4. The lamp current sensing unit 140 is a resistor for sensing the lamp current and converts the lamp current into a voltage to control the lamp current.

The connection relationship between the lamp unit 120, the lamp current balance unit 130, and the lamp current sensing unit 140 described above is as follows.

One end of the first power supply unit V1 is electrically connected to one end of the second lamp Lamp2, and the other end of the first power supply unit V1 is electrically connected to one end of the third lamp Lamp3. One end of the first vehicle-side of the first transformer T1 is electrically connected to the other end of the second lamp Lamp2, and one end of the second vehicle-side of the first transformer T1 is electrically connected to the other end of the third lamp Lamp3. Is connected.

One end of the second power supply V2 is electrically connected to one end of the first lamp Lamp1, and the other end of the second power supply V2 is electrically connected to one end of the fourth lamp Lamp4. One end of the first vehicle-side of the second transformer T2 is electrically connected to the other end of the first lamp Lamp1, and the second vehicle-side end of the second transformer T2 is the first of the first transformer T1. It is electrically connected to the other end of the vehicle. The first end of the second transformer T2 is electrically connected to one end of the first sensing resistor R1, and the second end of the second transformer T2 is one end of the second sensing resistor R2. Is electrically connected to the

The first primary end of the third transformer T3 is electrically connected to the second secondary end of the first transformer T1, and the second primary end of the third transformer T3 is the fourth lamp Lamp4. Is electrically connected to the other end of the The first end of the third transformer T3 is electrically connected to one end of the third sensing resistor R3, and the second end of the third transformer T3 is one end of the fourth sensing resistor R4. Is electrically connected to the

In addition, the other end of the first sensing resistor R1, the other end of the second sensing resistor R2, the other end of the third sensing resistor R3, and the other end of the fourth sensing resistor R4 are electrically connected to the reference voltage source GND. Connected.

The driving operation of the lamp unit 120, the lamp current balance unit 130, and the lamp current sensing unit 140 electrically connected as described above are as follows.

When power is supplied through the first power supply V1, the second lamp 3 is turned on and the second lamp current and the third lamp current are supplied to the second lamp Lamp2 and the third lamp Lamp3. The first transformer T1 electrically connected to the second lamp Lamp2 and the third lamp Lamp3 includes a second lamp current supplied to the second lamp Lamp2 and a third lamp supplied to the third lamp Lamp3. By detecting and controlling the lamp current, the current deviation between the second lamp current supplied to the second lamp Lamp2 and the third lamp current supplied to the third lamp Lamp3 is reduced.

At this time, the first transformer T1 is supplied to the second lamp current supplied to the second lamp Lamp2 and the third lamp Lamp3 which are supplied to the second lamp Lamp2 in the reverse phase since the first and second vehicle sides have a reverse phase. After receiving the respective third lamp current is to reduce the current deviation between the second lamp current and the third lamp current, and outputs the lamp current with reduced current deviation. That is, the average lamp current of the second lamp current supplied to the second lamp Lamp2 and the third lamp current supplied to the third lamp Lamp3 is output.

At the same time, when power is supplied through the second power supply unit V2, the first lamp 4 is turned on and the first lamp current and the fourth lamp current are supplied. The second transformer T2 electrically connected to the first lamp Lamp1 and the first transformer T1 may include a first lamp current, a second lamp current, and a third lamp current supplied to the first lamp Lamp1. By detecting and controlling the average lamp current, the current deviation of the average lamp current of the first lamp current and the second lamp current and the third lamp current is reduced.

In addition, the third lamp T3 electrically connected to the fourth lamp Lamp4 and the first transformer T1 may include a fourth lamp current, a second lamp current, and a third lamp supplied to the fourth lamp Lamp4. By detecting and controlling the average lamp current of the current, the current deviation of the average lamp current of the fourth lamp current and the second lamp current and the third lamp current is reduced.

As described above, in a state where the current deviation between the second lamp current and the third lamp current is reduced, the current deviation between the average lamp current of the second lamp current and the third lamp current and the first lamp current is reduced, and at the same time, the second lamp current is reduced. And a current balance between the first lamp current and the fourth lamp current by reducing the current deviation between the average lamp current and the fourth lamp current of the third lamp current. Therefore, the lamp current with reduced current deviation is supplied to the first and fourth lamps Lamp1 to Lamp4.

The first lamps Lamp1 to Lamp4 described above are electrically connected to the lamp current sensing unit 140 in series. That is, the first sensing resistor R1 is electrically connected in series with the first lamp Lamp1, the second sensing resistor R2 is electrically connected in series with the second lamp Lamp2, and the third sensing resistor R3 ) Is electrically connected in series with the third lamp (Lamp3), and the fourth sensing resistor (R4) is electrically connected in series with the fourth lamp (Lamp4).

As such, by being electrically connected in series, the first lamp current supplied to the first lamp Lamp1 may be checked through the first sensing resistor R1, and the second lamp L2 may be checked through the second sensing resistor R2. The second lamp current supplied to the third lamp current may be checked through the third sensing resistor R3, and the third lamp current supplied to the third lamp Lamp3 may be checked, and the fourth lamp current may be checked through the fourth sensing resistor R4. The fourth lamp current supplied to the lamp Lamp4 can be confirmed. Accordingly, even if a defect occurs in the lamp unit 120, the error is easily detected.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the configuration and operation as such is shown and described.

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

Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

1 illustrates a lamp driving apparatus according to a first embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

100: lamp driving device 110: power supply

120: lamp unit 130: lamp current balance unit

140: lamp current sensing unit

Claims (5)

A lamp unit electrically connected to a power supply unit and operated by receiving power provided from the power supply unit; A lamp current balance unit electrically connected to the lamp unit and controlling a lamp current supplied to the lamp unit to maintain the balance of the lamp current; And A lamp current sensing unit configured to sense the lamp current; Lamp driving device comprising a. According to claim 1, The lamp current balancer includes a first transformer to a third transformer. The method according to claim 1 or 2, The lamp unit includes first to fourth lamps The second lamp and the third lamp are electrically connected to the first transformer, the first lamp is electrically connected to the second transformer, and the fourth lamp is electrically connected to the third transformer. Lamp drive connected. The method of claim 3, The lamp current sensing unit includes a first sensing resistor to a fourth sensing resistor, The first sensing resistor is electrically connected in series with the first lamp, the second sensing resistor is electrically connected in series with the second lamp, and the third sensing resistor is electrically connected in series with the third lamp. And the fourth sensing resistor is electrically connected in series with the fourth lamp. The method of claim 2, The phase of the first transformer is a phase opposite to the phase of the second transformer, the phase of the second transformer is the same phase as the phase of the third transformer.
KR1020090067937A 2009-07-24 2009-07-24 Device for driving lamp KR20110010392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090067937A KR20110010392A (en) 2009-07-24 2009-07-24 Device for driving lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090067937A KR20110010392A (en) 2009-07-24 2009-07-24 Device for driving lamp

Publications (1)

Publication Number Publication Date
KR20110010392A true KR20110010392A (en) 2011-02-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090067937A KR20110010392A (en) 2009-07-24 2009-07-24 Device for driving lamp

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160126214A (en) 2015-04-23 2016-11-02 주식회사 솔루엠 Led driver
KR101684153B1 (en) * 2015-07-27 2016-12-07 강원대학교산학협력단 Hybrid system for balancing current difference of multiple LED string

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160126214A (en) 2015-04-23 2016-11-02 주식회사 솔루엠 Led driver
KR101684153B1 (en) * 2015-07-27 2016-12-07 강원대학교산학협력단 Hybrid system for balancing current difference of multiple LED string

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