KR20110010396A - Apparatus for protecting arc discharge of inverter - Google Patents

Abstract

PURPOSE: An inverter arc discharge protection device is provided to prevent the malfunction of an inverter by rapidly discharging an arc voltage when the arc is discharged. CONSTITUTION: A current sensing part(106) converts an AC current, which is supplied from an inverter transformer, into a DC current. The current sensing part is electrically connected to one end of an inverter IC. A voltage sensing part(108) converts an AC voltage, which is supplied from the inverter transformer, into a DC voltage. The voltage sensing part is electrically connected to the other end of the inverter IC. A connector(110) for a back light supplies an AC current or an AC voltage to the back light. An arc discharge protection part(112) stops the operation of the inverter IC when the arc discharge is generated from the connector for a back light.

Description

Apparatus for protecting arc discharge of inverter

Embodiments relate to an inverter arc discharge protection device.

In general, since a liquid crystal display (hereinafter referred to as "LCD") is a light receiving device that does not emit light by itself, a liquid crystal display panel is formed by using a backlight attached to the rear side of the liquid crystal display panel. Illuminated.

In the liquid crystal display, an inverter is used to drive the backlight.

However, the conventional liquid crystal display device has a problem in that a malfunction of the inverter occurs due to arc discharge when the output of the high voltage inverter and the connector supplied to the backlight are incompletely contacted with each other.

Inverter arc discharge protection device according to the embodiment can sensitively sense the amount of change in the voltage when the arc discharge occurs, and can prevent the malfunction of the inverter while the arc voltage to ground discharge quickly.

Inverter arc discharge protection device according to the embodiment outputs the inverter IC, the inverter transformer, the alternating current supplied from the output end and the other end of the inverter transformer as a DC current of an appropriate level and electrically connected to one end of the inverter IC The current sensing unit for sensing the appropriate level of DC current output through the current sensing of the output, and the AC voltage supplied from one end and the other end of the output side of the inverter transformer to the appropriate level of DC voltage and electrically connected to the other end of the inverter IC Among the AC current or AC voltage supplied from the output side of the inverter transformer electrically connected to the inverter transformer, the current sensing unit and the voltage sensing unit for sensing the DC voltage of the appropriate level output through the voltage sensing of the inverter IC Supply at least one to the backlight Back light connecting connector connected to the lock backlight and the voltage sensing unit, and electrically connected to the voltage sensing unit to receive the appropriate level of DC voltage output from the voltage sensing unit when an arc discharge is generated from the backlight connecting connector. And an arc discharge protection unit for supplying a shut-down signal to the other end of the inverter IC after outputting to ground discharge to stop the operation of the inverter IC.

Inverter arc discharge protection device according to the embodiment has the effect of sensitively sensing the amount of change in the voltage when the arc discharge occurs, and can prevent the malfunction of the inverter while quickly discharge the arc voltage to ground.

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

<Examples>

1 is a circuit diagram showing an inverter arc discharge protection device according to an embodiment of the present invention.

Referring to FIG. 1, an inverter arc discharge protection device 100 according to an embodiment of the present invention may include an inverter IC 102, an inverter transformer 104, a current sensing unit 106, a voltage sensing unit 108, and a backlight. Connection connector 110, arc discharge protection unit 112, and the like.

The current sensing unit 106 outputs an alternating current supplied from one end of the output transformer 104 and the other end of the inverter transformer 104 as a DC current of an appropriate level, and is electrically connected to one end of the inverter IC 102 so that It is provided to sense an appropriate level of DC current output through current sensing.

At this time, the current sensing unit 106 is at least one resistor (R1, R2, R3, R4, R5, R6, R7, R8, R9), at least one current sensing rectification diode (D1, D2), at least one other Resistors (R10, R11, R12, R13, R14, R15, R16, R17, R18), at least one current sensing rectifier diode (D3, D4), at least one current sensing resistor (R19, R20, R21) ), The current sensing terminal 106a, and the like.

At least one resistor (R1, R2, R3, R4, R5, R6, R7, R8, R9) may be provided such that one end is electrically connected to one end of the output side of the inverter transformer 104 and the other end is grounded.

In this case, the at least one resistor (R1, R2, R3, R4, R5, R6, R7, R8, R9) is the first, second, third resistor (R1, R2, R3) and the fourth, fifth, sixth connected in series with each other Resistors R4, R5, R6 and seventh, eighth, and ninth resistors R7, R8, and R9, and may include first, second, and third resistors R1, R2, R3, and fourth, fifth, and sixth resistors. The resistors R4, R5, and R6 and the seventh, eighth, and ninth resistors R7, R8, and R9 may be connected in parallel with each other.

At least one current sensing rectifier diode (D1, D2) is electrically connected to at least one resistor (R1, R2, R3, R4, R5, R6, R7, R8, R9) and at least one resistor (R1, R2). , R3, R4, R5, R6, R7, R8, R9) can be provided to rectify the alternating current supplied.

In this case, the at least one current sensing rectifying diode D1 and D2 may include a first rectifying diode D1 and a second rectifying diode D2 connected in series with each other.

At least one other resistor R10, R11, R12, R13, R14, R15, R16, R17, R18 may be provided so that one end is electrically connected to the other end of the output side of the inverter transformer 104 and the other end is grounded. .

In this case, at least one of the resistors R10, R11, R12, R13, R14, R15, R16, R17, and R18 is connected to the tenth, eleventh and twelfth resistors R10, R11, and R12 and the thirteenth, fourteenth, 15 resistors (R13, R14, R15) and 16, 17, 18 resistors (R16, R17, R18), and may include the tenth, eleventh and twelfth resistors (R10, R11, R12) and the thirteenth, fourteenth, The fifteen resistors R13, R14, and R15 and the sixteenth, seventeenth, and eighteenth resistors R16, R17, and R18 may be connected in parallel with each other.

The at least one current sensing rectifier diode (D3, D4) is electrically connected to at least one other resistor (R10, R11, R12, R13, R14, R15, R16, R17, R18) to at least one other resistor ( R10, R11, R12, R13, R14, R15, R16, R17, R18 may be provided to rectify the alternating current supplied through.

In this case, the at least one current sensing rectifying diode D3 and D4 may include a third rectifying diode D3 and a second rectifying diode D4 connected in series with each other.

At least one current sensing resistor (R19, R20, R21) is electrically connected to an output terminal of at least one current sensing rectifying diode (D1, D2) and at least one current sensing rectifying diode (D3, D4). And the other end may be provided to be grounded.

In this case, the at least one current sensing resistor (R19, R20, R21) may include the 19, 20, 21 resistor (R19, R20, R21) connected in series with each other.

The current sensing terminal 106a may be provided to be electrically connected to at least one current sensing resistor R19, R20, and R21 and the current sensing pin ISEN of the inverter IC 102.

The current sensing unit 106 may output an alternating current output from the transformer 104 as a direct current having an appropriate level to sense an amount of change in the current.

The voltage sensing unit 108 outputs an AC voltage supplied from one end of the output side of the inverter transformer 104 and the other end to a DC voltage of an appropriate level, and is electrically connected to the other end of the inverter IC 102 so as to be connected to the other end of the inverter IC 102. It can be provided to sense the appropriate level of the DC voltage output through the voltage sensing.

In this case, the voltage sensing unit 108 includes at least one capacitor C1, C2, C3, at least one rectifying diode D5, D6, at least one capacitor C4, C5, C6, or at least another capacitor. One or more voltage sensing rectifier diodes D7 and D8, at least one voltage sensing resistor R22, at least one voltage sensing capacitor C7, and a voltage sensing terminal 108a may be included.

At least one capacitor C1, C2, C3 may be provided such that one end is electrically connected to one end of the output side of the inverter transformer 104 and the other end is grounded.

In this case, the at least one capacitor C1, C2, C3 may include a first capacitor C1, and the second capacitor C2 and the third capacitor C3 connected in parallel with the first capacitor C1 may be included. Can be included

At least one voltage sensing rectifier diode (D5, D6) is electrically connected to at least one capacitor (C1, C2, C3) to provide rectification of the AC voltage stored in the at least one capacitor (C1, C2, C3) Can be.

In this case, the at least one voltage sensing rectification diodes D5 and D6 may include a fifth rectifying diode D5 and a sixth rectifying diode D6 connected in series with each other.

At least one other capacitor C4, C5, C6 may be provided such that one end is electrically connected to the other end of the output side of the inverter transformer 104 and the other end is grounded.

In this case, the at least one other capacitor C4, C5, C6 may include a fourth capacitor C4, and the fifth capacitor C5 and the sixth capacitor C6 connected in parallel with the fourth capacitor C4. It can include.

The at least one rectifying diode D7, D8 for voltage sensing is electrically connected to at least one other capacitor C4, C5, C6 to rectify an AC voltage stored in the at least one other capacitor C4, C5, C6. It can be provided to make.

In this case, the at least one other voltage sensing rectifying diodes D7 and D8 may include a seventh rectifying diode D7 and an eighth rectifying diode D8 connected in series with each other.

At least one voltage sensing resistor (R22, R23) is electrically connected at one end to the output terminal of the at least one voltage sensing rectification diode (D5, D6) and at least another voltage sensing rectification diode (D7, D8) In other words, the other end may be provided to be grounded.

In this case, the at least one voltage sensing resistors R22 and R23 may include twenty-second and twenty-second resistors R22 and R23 connected in series.

The at least one voltage sensing capacitor C7 may be provided such that one end is electrically connected to the at least one voltage sensing resistor R22 and R23 in parallel with each other and the other end is grounded.

In this case, the at least one voltage sensing capacitor C7 may be connected in parallel with the twenty-third resistor R23.

The voltage sensing terminal 108a may be provided to be electrically connected to at least one voltage sensing resistor R22 and R23 and the voltage sensing pin VSEN of the inverter IC 102.

The voltage sensing unit 108 may output an AC voltage output from the transformer 104 to a DC voltage having an appropriate level to sense an amount of change in the voltage.

The backlight connection connector 110 is electrically connected to the inverter transformer 104, the current sensing unit 106, and the voltage sensing unit 108 so that at least one of an alternating current or an alternating voltage supplied from the output side of the inverter transformer 104 is provided. Are connected to the backlight (not shown) to supply the to the backlight (not shown).

In this case, the backlight connection connector 110 may include a first backlight connection connector 110a and a second backlight connection connector 110b.

The first backlight connection connector 110a may be electrically connected to one end of the output side of the inverter transformer 104, and the second backlight connection connector 110b may be electrically connected to the other end of the output side of the inverter transformer 104.

The arc discharge protection unit 112 is electrically connected to the voltage sensing unit 108, and when an arc discharge occurs from the backlight connection connector 110, the arc discharge protection unit 112 outputs a DC voltage having an appropriate level output from the voltage sensing unit 108. After receiving the supplied DC voltage of different level and discharging the arc voltage to ground, supplying a Shut-Down signal to one end of the inverter IC 102 to stop the operation of the inverter IC 102. do.

At this time, the arc discharge protection unit 112 is at least one arc discharge protection capacitor (C8), at least one other arc discharge protection capacitor (C9), at least one arc discharge protection resistor (R24, R25), at least one Rectifier diode (D9), ground discharge capacitor (C10), at least one arc discharge protection resistor (R26), at least one switching element (Q1), at least another arc discharge protection resistor (R27) , R28 and R29, at least one other arc discharge protection capacitor C11, and at least one other switching element Q2.

At least one arc discharge protection capacitor C8 may be electrically connected to the second capacitor C2.

In this case, the at least one arc discharge protection capacitor C8 may include an eighth capacitor C8.

At least one other arc discharge protection capacitor C9 may be electrically connected to the fourth capacitor C4 and may be electrically connected to at least one arc discharge protection capacitor C8.

In this case, at least one other arc discharge protection capacitor C9 may include a ninth capacitor C9.

At least one of the arc discharge protection resistors R24 and R25 may be provided such that one end is electrically connected to the at least one arc discharge protection capacitor C8 and the at least one other arc discharge protection capacitor C9 and the other end is grounded. have.

In this case, the at least one arc discharge protection resistor (R24, R25) may include the 24th, 25th resistor (R24, R25) connected in series with each other.

At least one arc discharge protection rectifier diode (D9) has one end of at least one arc discharge protection capacitor (C8) and at least one arc discharge protection capacitor (C9) and at least one arc discharge protection resistor (R24, R25). It may be provided to be electrically connected between and the other end to ground.

In this case, the at least one rectifying diode D9 for arc discharge protection may include a ninth rectifying diode D9.

The ground discharge capacitor C10 may be provided such that one end is connected in parallel with at least one of the arc discharge protection resistors R24 and R25 and the other end is grounded.

In this case, the ground discharge capacitor C10 may include a tenth capacitor C10.

At least one other arc discharge protection resistor R26 may be provided to be electrically connected to the ground discharge capacitor C10.

In this case, the at least one other arc discharge protection resistor R26 may include the 26th resistor R26.

At least one switching element Q1 may be provided such that one end is electrically connected between at least one other arc discharge protection resistor R26 and the ground discharge capacitor C10, and the other end is grounded to selectively turn on. have.

In this case, at least one switching element Q1 may include a first switching element Q1, and the first switching element Q1 may include a PNP type BJT.

At least another arc discharge protection resistor (R27, R28, R29) is electrically connected at one end to the reference voltage supply pin (VREF) of the inverter IC (102), the other end is at least one switching element (Q1) It can be provided to be electrically connected.

In this case, at least one of the arc discharge protection resistors R27, R28, and R29 may include the twenty-seventh, 28, and 29 resistors R27, R28, and R29 connected in series with each other.

At least another arc discharge protection capacitor C11 may be provided to be connected in parallel with at least another arc discharge protection resistor R27, R28, and R29.

In this case, the at least one arc discharge protection capacitor C11 may include the eleventh capacitor C11.

At least one other switching element Q2 has one end electrically connected to at least one other arc discharge protection resistor R26, and the other end is at least another arc discharge protection resistor R27, R28, R29 and at least another The other arc discharge protection capacitor C11 may be electrically connected and selectively turned on.

In this case, at least one other switching element Q2 may include a second switching element Q2, and the second switching element Q2 may include an NPN type BJT.

However, the present invention is not limited thereto, but at least one switching element Q1 and at least one other switching element Q2 may include at least one of a MOSFET and an IGBT in consideration of switching loss and high power transfer. There is a number.

The arc discharge protection unit 112 turns on the first switching element Q1 with the arc voltage stored in the ground discharge capacitor C10, and the reference voltage supply pin VREF and the 27th, 28 and 29 turn on the second switching element Q2 to a voltage supplied through the resistors R27, R28, and R29 and stored in the eleventh capacitor C11.

At this time, when the second switching element Q2 is turned on, the first switching element Q1 is turned on and ground-discharges the arc voltage stored in the ground discharge capacitor C10 while maintaining the latch state. The OV is supplied to the UVLS pin of the inverter IC 102 as a shut-down signal to stop the operation of the inverter IC 102.

As such, the inverter arc discharge protection device 100 according to an embodiment of the present invention sensitively senses a change in voltage through the voltage sensing unit 108 when an arc discharge occurs from the backlight connection connector 110. In addition, since the operation of the inverter IC 102 can be stopped while the arc voltage is ground-discharged quickly through the arc discharge protection unit 112, malfunctions can be prevented when the inverter is driven.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

1 is a circuit diagram showing an inverter arc discharge protection device according to an embodiment of the present invention.

Description of the main parts of the drawing

100: inverter arc discharge protection device 102: inverter IC

104: inverter transformer 106: current sensing unit

108: voltage sensing unit 110: connection connector for the backlight

112: arc discharge protection unit

Claims (30)

An inverter IC; An inverter transformer; Outputs an alternating current supplied from one end and the other end of the inverter transformer as an appropriate level of DC current, and is electrically connected to one end of the inverter IC to sense an appropriate level of DC current output through current sensing of the inverter IC. A current sensing unit; The AC voltage supplied from one end and the other end of the output of the inverter transformer is output as a DC voltage of an appropriate level, and is electrically connected to the other end of the inverter IC to sense an appropriate level of DC voltage output through voltage sensing of the inverter IC. A voltage sensing unit; A backlight connection connector electrically connected to the inverter transformer, the current sensing unit, and the voltage sensing unit and connected to the backlight to supply at least one of an alternating current or an alternating voltage supplied from an output side of the inverter transformer to the backlight; And It is electrically connected to the voltage sensing unit, and when an arc discharge occurs from the backlight connection connector, a DC voltage of an appropriate level output from the voltage sensing unit is supplied and output to a different level of DC voltage to ground the arc voltage. And an arc discharge protection unit for supplying a shut-down signal to the other end of the inverter IC to stop the operation of the inverter IC after discharging. The method of claim 1, The inverter IC includes a current sensing pin; The current sensing unit, At least one resistor whose one end is electrically connected to one end of an output side of the inverter transformer and whose other end is grounded; At least one current sensing rectifier diode electrically connected to the at least one resistor to rectify an alternating current supplied through the at least one resistor; At least one resistor having one end electrically connected to the other end of the output side of the inverter transformer and having the other end grounded; At least another current sensing rectifier diode electrically connected to the at least one other resistor to rectify an alternating current supplied through the at least one other resistor; At least one current sensing resistor, one end of which is electrically connected to an output terminal of the at least one current sensing rectifying diode and the at least one other current sensing rectifying diode, the other end of which is grounded; And And a current sensing terminal electrically connected to the at least one current sensing resistor and the current sensing pin. 3. The method of claim 2, The at least one resistor comprises first, second, third and fourth, fifth, and sixth resistors, and the seventh, eighth, and ninth resistors connected in series with each other; And the first, second, third resistors, the fourth, fifth, sixth resistors, and the seventh, eighth, and ninth resistors are connected in parallel to each other. 3. The method of claim 2, The at least one rectifying diode for current sensing includes a first rectifying diode and a second rectifying diode connected in series with each other. 3. The method of claim 2, The at least one other resistor includes tenth, eleven, and twelve resistors, thirteenth, fourteenth, and fifteenth resistors, and sixteenth, seventeenth, and eighteenth resistors connected in series with each other; And the tenth, eleventh, and twelfth resistors, the thirteenth, fourteenth, and fifteenth resistors, and the sixteenth, seventeenth, and eighteenth resistors, are connected in parallel to each other. 3. The method of claim 2, The at least one other current sensing rectifier diode includes a third rectifier diode and a fourth rectifier diode connected in series with each other. 3. The method of claim 2, The at least one current sensing resistor includes a nineteenth, twenty, twenty-first resistor connected in series with each other. The method of claim 1, The inverter IC includes a voltage sensing pin; The voltage sensing unit, At least one capacitor whose one end is electrically connected to one end of the output side of the inverter transformer and whose other end is grounded; At least one rectifying diode electrically connected to the at least one capacitor to rectify an alternating voltage stored in the at least one capacitor; At least one capacitor whose one end is electrically connected to the other end of the output side of the inverter transformer and whose other end is grounded; At least another voltage sensing rectifier diode electrically connected to the at least one other capacitor to rectify an alternating voltage stored in the at least one other capacitor; At least one voltage sensing resistor having one end electrically connected to an output terminal of the at least one voltage sensing rectifier diode and the at least one other voltage sensing rectifier diode, the other end of which is grounded; At least one voltage sensing capacitor having one end electrically connected in parallel with the at least one voltage sensing resistor and the other end grounded; And And a voltage sensing terminal electrically connected to the at least one voltage sensing resistor and the voltage sensing pin. The method of claim 8, The at least one capacitor comprises a first capacitor; Inverter arc discharge protection device comprising a second capacitor and a third capacitor connected in parallel with the first capacitor. The method of claim 8, The at least one rectifying diode for voltage sensing includes a fifth rectifying diode and a sixth rectifying diode connected in series with each other. The method of claim 8, The at least one other capacitor comprises a fourth capacitor; Inverter arc discharge protection device including a fifth capacitor and a sixth capacitor connected in parallel with the fourth capacitor. The method of claim 8, The at least one other rectifying diode for voltage sensing includes a seventh rectifying diode and an eighth rectifying diode connected in series with each other. The method of claim 8, The at least one voltage sensing resistor includes a twenty-second, twenty-third resistor connected in series with each other. The method of claim 13, And the at least one voltage sensing capacitor is connected in parallel with the twenty-third resistor. The method of claim 1, The backlight connection connector, A first backlight connection connector electrically connected to one end of an output side of the inverter transformer; And And a second backlight connection connector electrically connected to the output end of the inverter transformer. The method according to claim 9 or 11, The arc discharge protection unit, At least one arc discharge protection capacitor electrically connected to the second capacitor; At least one other arc discharge protection capacitor electrically connected to the fourth capacitor and electrically connected to the at least one arc discharge protection capacitor; At least one arc discharge protection resistor having one end electrically connected to the at least one arc discharge protection capacitor and the at least one other arc discharge protection capacitor and the other end of which is grounded; At least one arc discharge protection rectifier diode having one end electrically connected between the at least one arc discharge protection capacitor, the at least one arc discharge protection capacitor, and the at least one arc discharge protection resistor, and the other end of which is grounded; ; A ground discharge capacitor having one end connected in parallel with the at least one arc discharge protection resistor and the other end grounded; At least one other arc discharge protection resistor electrically connected to the ground discharge capacitor; At least one switching element having one end electrically connected between the at least one other arc discharge protection resistor and the ground discharge capacitor and the other end being grounded to selectively turn on; At least one other arc discharge protection resistor having one end electrically connected to a reference voltage supply pin of the inverter IC and the other end electrically connected to the at least one switching element; At least one arc discharge protection capacitor connected in parallel with the at least another arc discharge protection resistor; At least one end electrically connected to the at least one other arc discharge protection resistor and the other end electrically connected to the at least one other arc discharge protection resistor and the another arc discharge protection capacitor and selectively turned on Inverter arc discharge protection device including the other switching element. The method of claim 16, And the at least one arc discharge protection capacitor comprises an eighth capacitor. The method of claim 16, The at least one other arc discharge protection capacitor includes an ninth capacitor. The method of claim 16, The at least one rectifier diode for arc discharge protection includes an ninth rectifier diode. The method of claim 16, The at least one arc discharge protection resistor includes a twenty-fourth, twenty-fifth resistor in series with each other. The method of claim 16, Inverter arc discharge protection device wherein the ground discharge capacitor comprises a tenth capacitor. The method of claim 16, The at least one other arc discharge protection resistor comprises a twenty sixth resistor. The method of claim 16, And said at least one switching element comprises a first switching element. 24. The method of claim 23, The first switching device is an inverter arc discharge protection device comprising a PNP type BJT. The method of claim 16, The at least one other arc discharge protection resistor includes a 27, 28, 29 resistor in series with each other. The method of claim 16, The at least one other arc discharge protection capacitor includes an eleventh capacitor. The method of claim 16, And said at least one other switching element comprises a second switching element. 28. The method of claim 27, The second switching device is an inverter arc discharge protection device comprising an NPN type BJT. The method of claim 16, The arc discharge protection unit, Through the alternate turn-on operation of the at least one switching element and the at least one other switching element, the arc voltage is ground-discharged while maintaining a latch state, and the shut-down signal is applied to the UVLS pin of the inverter IC. Inverter arc discharge protection device for supplying OV to stop the operation of the inverter IC. The method of claim 16, The at least one switching element and the at least one other switching element, Inverter arc discharge protection device comprising at least one of a MOSFET and an IGBT.

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