CN101578005B - Lamp driving circuit - Google Patents
Lamp driving circuit Download PDFInfo
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- CN101578005B CN101578005B CN200910134473XA CN200910134473A CN101578005B CN 101578005 B CN101578005 B CN 101578005B CN 200910134473X A CN200910134473X A CN 200910134473XA CN 200910134473 A CN200910134473 A CN 200910134473A CN 101578005 B CN101578005 B CN 101578005B
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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
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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
- H05B41/02—Details
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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
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
Abstract
The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer. The lamp driving circuit in accordance with the present invention includes a rectification unit; a PFC unit; a switching unit; an insulation transformer unit which includes a transformer to secure safe insulation by including an input terminal and aground terminal of one primary side and all output terminals of first and second secondary sides each of which includes two output terminals at sides facing each other and a resonant capacitor, and o utputs a plurality of driving voltages which have the same amplitude and drive a plurality of lamps respectively by receiving the square wave voltages outputted from the switching unit; and an insulation feedback unit for sensing any one of the plurality of driving voltages and transmitting the driving voltage to the switching unit positioned at the primary side of the transformer, wherein the insulation feedback unit insulates the primary side of the transformer from the secondary side of the transformer.
Description
The cross reference of related application
The application requires on April 18th, 2008 and was submitted to the right of priority of 10-2008-0036046 and the 10-2009-0000261 korean patent application of Korea S Department of Intellectual Property on January 5th, 2009.
Technical field
The present invention relates to lamp drive circuit, relate more specifically to a kind of can be by driving via transformer that a plurality of lamps are simplified and by being formed on the lamp drive circuit of raising the efficiency and reduce cost on the single plate, wherein, the lead-out terminal of the input terminal of the primary side of transformer and primary side faces with each other to satisfy safe insulation.
Background technology
Along with the development of display technique, trend in recent years is that LCD (liquid crystal display) is widely used in TV and monitor gradually.When to LCD and CRT (cathode-ray tube (CRT)) when monitor compares, LCD has advantages of that the thin and flicker of longitudinal cross-section reduces.
Such LCD comprises the backlight module that is used to provide light source and need not autoluminescence, and backlight module has the fluorescent light with high voltage drive.
Simultaneously, inverter is used for driving the fluorescent light of backlight module, and wherein, inverter needs high voltage transformer, and this transformer offers electric current on the lamp that consists of the LCD panel by utilizing low pulse input voltage to produce high AC output voltage.
At this moment, because traditional transformer provides single lamp driving voltage by single transformer, therefore need a plurality of transformers to come a plurality of EEFL of parallel drive (external electrode fluorescent lamp) or a plurality of CCFL (cold-cathode fluorescence lamp).
In addition, along with LCD TV and monitor market are ripe day by day, price reduces and the therefore parts price continuous decrease relevant with backlight module.
Therefore, because the price pressure of parts relevant with backlight module has continued to make the effort of reduction part count and cost, and as the part of this effort, carry out energetically can driving by a transformer exploitation campaign of the product of many lamps.
By the exploitation of this product, developed in recent years a kind of new transformer, take by come to export a plurality of driving voltages as driving separately a plurality of lamps with a transformer.At this moment, a plurality of driving voltages from many output transformer outputs have different amplitudes.
In the situation that the amplitude of not all driving voltage all equates, the brightness of a plurality of lamps is different, thereby the reliability of backlight module reduces.Therefore, comprise coil with balance drive voltage at the output stage place of this transformer, wherein, by coil is included in each lamp one by one, coil can utilize adjacent lamp to reach current balance type.
Yet because such lamp driving method can not guarantee safe insulation, 24Vdc converting unit or man-to-man transformer are added to prime guaranteeing safe insulation, thereby have reduced efficient and improved cost.
Summary of the invention
Invention the present invention is to overcome the problems referred to above, and therefore the object of the present invention is to provide a kind ofly can be formed on lamp drive circuit on the single plate by drive a plurality of lamps via transformer, wherein transformer by comprising the primary side that faces with each other input terminal and the lead-out terminal of primary side guarantee safe insulation.
In order to reach this purpose, according to an aspect of the present invention, provide a kind of lamp drive circuit, this lamp drive circuit comprises: rectification unit is used for input voltage is carried out rectification; PFC (power factor correction) unit is dc voltage for the power factor of the voltage after the rectification of raising rectification unit and with the voltage transitions after the rectification; Switch unit is used for switching the dc voltage of PFC unit so that dc voltage is converted to square-wave voltage; The insulating transformer unit, it comprises transformer and resonant capacitor, and export a plurality of driving voltages that have same magnitude and be used for driving respectively a plurality of lamps by receiving from the square-wave voltage of switch unit output, wherein, this transformer comprises the input terminal of a primary side and all lead-out terminals of ground terminal and the first primary side and second subprime side, the first primary side and second subprime side respectively comprise two lead-out terminals, and transformer input terminal and all lead-out terminals of ground terminal and the first primary side and second subprime side by making primary side are positioned at the both sides that face with each other and guarantee safe insulation; And the insulation feedback unit, the switch unit that is used for responding to any driving voltage of a plurality of driving voltages and this driving voltage is sent to the primary side that is positioned at transformer, wherein, the insulation feedback unit makes the primary side of transformer and the primary side insulation of transformer.
In order to reach this purpose, according to another aspect of the present invention, provide a kind of lamp drive circuit, this lamp driving voltage comprises: rectification unit is used for input voltage is carried out rectification; PFC (power factor correction) unit is dc voltage for the power factor of the voltage after the rectification of raising rectification unit and with the voltage transitions after the rectification; Switch unit is used for switching the dc voltage of PFC unit so that dc voltage is converted to square-wave voltage; The insulating transformer unit, it comprises a plurality of transformers and at least one resonant capacitor, and export a plurality of driving voltages that have same magnitude and drive respectively a plurality of lamps by receiving from the square-wave voltage of switch unit output, a plurality of transformers comprise the input terminal of a primary side and all lead-out terminals of ground terminal and the first primary side and second subprime side, the first primary side and second subprime side respectively comprise two lead-out terminals, and a plurality of transformers input terminal and all lead-out terminals of ground terminal and the first primary side and second subprime side by making a primary side are positioned at the both sides that face with each other and guarantee safe insulation; And the insulation feedback unit, the switch unit that is used for responding to any driving voltage of a plurality of driving voltages and this driving voltage is sent to the primary side that is positioned at transformer, wherein, the insulation feedback unit makes the primary side of transformer and the primary side insulation of transformer.
According to the present invention, switch unit comprises: switch control unit is used for exporting the first switching signal and the second switching signal have predetermined amplitude with output square-wave voltage by receiving via the induction driving voltage of insulation feedback unit; The first switching device shifter is controlled as and switches on and off by receiving the first switching signal; And second switching device shifter, be controlled as and switch on and off by receiving the second switching signal.
According to the present invention, switch unit is formed semibridge system or full-bridge type.
According to the present invention, each in a plurality of transformers of insulating transformer unit includes: the armature winding unit, by the coil winding of primary side and be provided with input terminal and ground terminal; First level winding element at one side place of armature winding unit is wound with the coil of the first primary side and is provided with two lead-out terminals; And the second subprime winding element at the opposite side place of armature winding unit, be wound with the coil of second subprime side and be provided with two lead-out terminals.
According to the present invention, coil twines with same first level winding element of number winding and second subprime winding element.
According to the present invention, the coil of primary side begins at the input terminal place to twine and finishes to twine at the ground terminal place, and wherein input terminal and ground terminal are arranged on the same side of transformer.
According to the present invention, the coil of the first primary side and second subprime side any place in lead-out terminal begins to twine and finishes to twine at another lead-out terminal place, and wherein two lead-out terminals are arranged on the side in the face of input terminal and the ground terminal of primary side.
According to the present invention, in the insulating transformer unit, a resonant capacitor is connected in series to the primary side of a plurality of transformers, the wherein primary side of a plurality of transformers connection that is one another in series.
According to the present invention, in the insulating transformer unit, this resonant capacitor is connected to each primary side of a plurality of transformers, and the primary side that wherein is connected to a plurality of transformers of resonant capacitor is connected in parallel.
According to the present invention, in the insulating transformer unit, a resonant capacitor is connected in series to the primary side of a plurality of transformers, and wherein the primary side of a plurality of transformers is connected in parallel with each other.
Description of drawings
The embodiment that carries out in conjunction with the drawings describes in detail, and these of total design of the present invention and/or other aspects and advantage will become apparent and be easier to understand, in the accompanying drawings:
Fig. 1 is the block diagram that illustrates according to lamp drive circuit of the present invention;
Fig. 2 is the circuit diagram that illustrates according to lamp drive circuit of the present invention;
Fig. 3 is the planimetric map that illustrates according to the transformer of lamp drive circuit of the present invention;
Fig. 4 is the circuit diagram that the lamp drive circuit of modified embodiment according to the present invention is shown;
Fig. 5 is the view that illustrates according to a plurality of transformers of lamp drive circuit of the present invention, and the primary side of transformer is connected in series; And
Fig. 6 is the view that illustrates according to a plurality of transformers of lamp drive circuit of the present invention, and the primary side of transformer is connected in parallel.
Embodiment
By the detailed description of carrying out with reference to the accompanying drawing that the preferred embodiment of the present invention is shown, will understand about according to the configuration of lamp drive circuit of the present invention and the flesh and blood of effect.
Hereinafter, lamp drive circuit according to the present invention is described in detail with reference to relevant drawings.
Fig. 1 is the block diagram that illustrates according to lamp drive circuit of the present invention, and Fig. 2 is the circuit diagram that illustrates according to lamp drive circuit of the present invention, and Fig. 3 is the planimetric map that illustrates according to the transformer of lamp drive circuit of the present invention.
At first, as shown in Figure 1, in order to drive four lamp L1～L4 with same brightness, lamp drive circuit according to the present invention comprises: rectification unit 110, PFC (power factor correction) unit 120, switch unit 130, insulating transformer unit 140 and insulation feedback unit 150.
As shown in Figure 2, rectification unit 110 comprises a plurality of diodes and receives input voltage vin so that electromagnetic wave is carried out rectification.At this moment, diode has half-bridge structure or full bridge structure.
Be the dc voltage with predetermined amplitude for the current power factor that improves the voltage after rectification unit 110 rectifications and with the voltage transitions after the rectification, PFC unit 120 comprises: inductor L, PWM (width modulation) switching device shifter M1, commutation diode D and smmothing capacitor C.
The end of the inductor L of PFC unit 120 is connected to rectification unit 110, and its other end is connected to the drain electrode of PWM switching device shifter M1 and the end of diode D.In addition, the drain electrode of PWM switching device shifter M1 is connected to the common node of inductor L and diode D and source ground and PWM switching device shifter M1 are controlled as on/off by receiving pwm control signal P via grid.
And, control by PWM switching device shifter M1 and come capacitor C is charged by the voltage that the negative electrode that an end is connected to diode D transmits other end ground connection.
So the PFC unit 120 of structure is the dc voltage with predetermined amplitude by utilizing pwm control signal P to control the voltage transitions that PWM switching device shifter M1 will apply via inductor L.
Namely, in the situation of amplitude less than the amplitude of predetermined voltage of dc voltage, can improve by the lasting cycle that the lasting cycle (duty width on period) of the work pulsewidth that improves pwm control signal P is improved PWM switching device shifter M1 the amplitude of dc voltage.
In addition, in the situation of amplitude greater than the amplitude of predetermined voltage of dc voltage, can reduce by the lasting cycle that the lasting cycle of the work pulsewidth that reduces pwm control signal P is reduced PWM switching device shifter M1 the amplitude of dc voltage.
Drain electrode is connected to the contact point of the capacitor C of PFC unit 120 and diode D and source electrode is connected to the first switching device shifter M2 of the drain electrode of the second switching device shifter M3 and switches on and off by receiving via grid to be controlled as from the first switching signal S1 of switch control unit 131 outputs.
In addition, drain electrode is connected to the source electrode of the first switching device shifter M2 and the second switching device shifter M3 of source ground switches on and off by receiving via grid to be controlled as from the second switching signal S2 of switch control unit 131 outputs.
And, by receive the feedback via the driving voltage of insulating transformer unit 140 outputs via insulation feedback unit 150, switch control unit 131 output the first switching signal S2 and the second switching signal S2 have the square-wave voltage of predetermined amplitude all the time with output for control the first switching device shifter M2 and the second switching device shifter M3.
Alternately switch on and off the first switching device shifter M2 and the second switching device shifter M3 by the first switching signal S1 and the second switching signal S2 from switch control unit 131 outputs, so the switch unit 130 of structure will be output as square-wave voltage via the dc voltage of PFC unit 120 outputs.
For example, connecting by the high level of the first switching signal S1 in the situation of the first switching device shifter M2, low level by the second switching signal S2 disconnects the second switching device shifter M3, so that the dc voltage of 120 outputs is sent to insulating transformer unit 140 via the first switching device shifter M2 from the PFC unit.
In addition, connecting by the high level of the second switching signal S2 in the situation of the second switching device shifter M3, low level by the first switching signal disconnects the first switching device shifter M2, is provided to insulating transformer unit 140 so that dc voltage not to be provided so that interrupt the dc voltage of 120 outputs from the PFC unit.
In addition, have the dc voltage of high voltage (such as 380V) as the sine voltage (such as 1.8KVa or 1.1KVa) of safe insulation because switch unit 130 can directly be exported via blocked operation, therefore do not need to comprise the extra DC-DC converter for reducing traditional dc voltage of 380V.
Therefore, can simplify Circnit Layout and realize miniaturization according to lamp drive circuit of the present invention.
Insulating transformer unit 140 will be converted to via the square-wave voltage that switch unit 130 provides a plurality of driving voltages and export them to drive a plurality of lamps.
At this moment, as shown in Figure 1 insulating transformer unit 140 four driving voltages of output with the situation that drives four lamp L1～L4 under, the insulating transformer unit comprises a transformer T1 and is connected to the resonant capacitor of the primary side of transformer T1, and in order to drive a plurality of lamps, the insulating transformer unit comprises n/4 transformer T1～T (n/4) and at least one resonant capacitor as shown in Figure 2.
At first, hereinafter with reference to Fig. 3 the situation that the insulating transformer unit comprises a transformer T1 is described.
Transformer T1 has a primary side Np and two primary side (the first primary side Ns1 and second subprime side Ns2).At this moment, the primary side Np of transformer T1 has input terminal 145a and ground terminal 145b, and is wound with primary coil 142 round the armature winding unit 141 of the central portion office that is arranged on transformer T1.
Particularly, the primary coil 142 of transformer T1 begins at input terminal 145a place to twine and finishes to twine at ground terminal 145b place.And, the input terminal 145a side that be arranged in transformer T1 parallel with ground terminal 145b.
In addition, the first primary side Ns2 of transformer T1 is positioned as first level winding element 143a round a side place that is arranged on armature winding unit 141, and comprises two lead-out terminal 146a and 146b.
At this moment, the the first secondary coil 144a that centers on first level winding element 143a winding begins at a lead-out terminal 146a place to twine and finishes to twine at another lead-out terminal 146b place, and wherein lead-out terminal 146a and 146b are formed on the input terminal 145a that faces primary coil 142 of transformer T1 and the opposite side place of ground terminal 145b.
As mentioned above, with the lead-out terminal 146a of the first secondary coil 144a with 146b does not form and the same side of the input terminal 145a of primary coil 142 and ground terminal 145b and that side of being formed in the face of them is because the first primary side Ns1 of transformer T1 has high voltage with the reason that guarantees the safe insulation between primary side and the primary side.
In other words, under the lead-out terminal 146a of the first secondary coil 144a and among the 146b any are formed on situation with input terminal 145a the same side, via the driving voltage of lead-out terminal output should again be sent in the face of the side of input terminal 145a guaranteeing insulation distance, thereby driving voltage is transmitted to lamp.
At this moment, in order to prevent producing mistake in first level winding element 143a when high voltage flows and therefore the lead-out terminal of input terminal side ends owing to high pressure, preferably lead-out terminal 146a and 146b both are formed on the insulation that is used for transformer T1 in the face of that side of input terminal 145a and ground terminal 145b.
In addition, the second subprime side Ns2 of transformer T1 orientates as round being arranged on respect to armature winding unit 141 and faces the second subprime winding element 143b of the side of first level winding element 143a, and comprises two lead-out terminal 146c and 146d.
At this moment, second subprime winding element 143b is constructed to be similar to level winding element 143a first time, wherein lead-out terminal 146c and 146d also be arranged in the face of that side of input terminal 145a and ground terminal 145b to realize insulation.
Particularly, be arranged on the driving voltage that output has same amplitude according to the transformer T1 of lamp drive circuit of the present invention, this is to twine with identical winding number with 144b because be arranged on respect to the first and second secondary winding unit 143a of the both sides of armature winding unit 141 and the first and second secondary coil 144a of 143b.
Therefore, in the situation that a plurality of driving voltages of output, can be via being exported the driving voltage that all the time have predetermined amplitude with 144b with the first and second secondary winding unit 143a and the 143b that identical winding number twines by the first and second secondary coil 144a, and do not comprise for the extra balancing unit of the driving voltage with different amplitudes being carried out balance, thereby reduce the size of circuit.
In addition, because the transformer T1 according to insulating transformer of the present invention unit 140 can be via four driving voltages of a transformer T1 output, therefore in the situation that drive four lamp L1～L4, can only drive whole four lamp L1～L4 via a transformer T1, thereby reduce volume.
And, as shown in Figure 2, in the situation that drive four or more lamp L1～Ln, can by resonant capacitor Cr1 is connected to these transformers each primary side and the primary side Np of a plurality of transformer T1～T (n/4) is connected to respectively the resonant capacitor Cr1 that is connected in parallel with each other such as above-mentioned structure, drive lamp L1～Ln with same brightness.
In addition, Fig. 5 is the view that illustrates according to a plurality of transformers of lamp drive circuit of the present invention, and the primary side of these transformers is connected in series.With reference to Fig. 5, can by a resonant capacitor Cr1 being connected in series to the primary side of a plurality of transformer T1～T (n/4) of connecting of being one another in series, drive a plurality of lamp L1～Ln with same brightness.In the situation that a plurality of transformer T1～T (n/4) link to each other with resonant capacitor Cr1, equate owing to flowing to the electric current of the primary side of whole transformers, the deviation that being used for of therefore transmitting drives the secondary side current of a plurality of lamp L1～Ln reduces.
In addition, Fig. 6 is the view that illustrates according to a plurality of transformers of lamp drive circuit of the present invention, and the primary side of these transformers is connected in parallel.With reference to Fig. 6, can by a resonant capacitor Cr1 being connected to the primary side of a plurality of transformer T1～T (n/4) that are connected in parallel with each other, drive a plurality of lamp L1～Ln with same brightness.
Particularly, drive the inverter boards of lamp drive circuit of a plurality of driving voltages of a plurality of lamp L1～Ln and the prior art that the balance plate that is provided with balancing unit increases processing technology than be useful on output by independent processing sets up, the present invention can be by shortening processing technology and time for being constructed to by exporting the driving voltage with same magnitude with the single plate that is provided with lamp drive circuit.
Simultaneously, as lamp drive circuit shown in Figure 4 of the modified embodiment according to the present invention be shown, in the situation that drive " U " shape lamp rather than straight line lamp, the end of the first lamp L1 is connected to the high voltage terminal N1 of the first primary side Ns1 of transformer T1, and its other end is connected to the low voltage terminal N2 of the first primary side Ns1.
In addition, the end of the second lamp L2 is connected to the high voltage terminal N3 of the second subprime side Ns2 of transformer T1, and its other end is connected to the low voltage terminal N4 of second subprime side Ns2.
Therefore, owing to can drive two " U " shape lamps by a transformer T1, so than the situation that drives " U " shape lamp by a traditional transformer, transformer number and circuit volume can reduce.
Then the induction of insulation feedback unit 150 sends it to the switch unit 130 of the primary side that is positioned at transformer via in a plurality of driving voltages of transformer output any.At this moment, insulation feedback unit 150 can play a part to make the primary side of transformer and the primary side insulation of transformer.
More specifically, any that insulation feedback unit 150 is responded in a plurality of driving voltages of exporting via transformer, then it is fed back to the switch control unit 131 of switch unit 130, and switch control unit 131 outputs are used for the first and second switching signal S1 of control the first and second switching device shifter M2 and M3 and S2 has predetermined amplitude all the time with output square-wave voltage.
As mentioned above, realize the transformer of the current balance type of driving voltage by the lead-out terminal that uses input terminal by comprising primary side in the both sides that face with each other and primary side, can realize miniaturization according to lamp drive circuit of the present invention.
In addition, realized the transformer of current balance type by use, the present invention can be used for driving in the processing of single plate the lamp drive circuit of a plurality of lamps, thereby reduces cost and raise the efficiency.
As described, although illustrated and described the preferred embodiments of the present invention, but it will be appreciated by those skilled in the art that in the situation of the principle that does not deviate from total inventive concept and spirit and can replace, change and change, limit scope of the present invention with claims and equivalent thereof.
Claims (15)
1. lamp drive circuit comprises:
Rectification unit is used for input voltage is carried out rectification;
The PFC unit has: inductor is connected to described rectification unit; The PWM switching device shifter is connected to described inductor; Diode is connected to described inductor and described PWM switching device shifter; And capacitor, being connected to described diode, described PFC unit is dc voltage for the power factor that improves the voltage after described rectification unit rectification and with the described voltage transitions after the rectification;
Switch unit forms semibridge system or full-bridge type, is used for switching the described dc voltage of described PFC unit so that described dc voltage is converted to square-wave voltage;
The insulating transformer unit, it comprises transformer and resonant capacitor, and export a plurality of driving voltages that are used for driving respectively a plurality of lamps that comprise same magnitude by receiving from the described square-wave voltage of described switch unit output, wherein, described transformer comprises the input terminal of a primary side and all lead-out terminals of ground terminal and the first primary side and second subprime side, described the first primary side and described second subprime side respectively comprise two lead-out terminals, and described transformer input terminal and all lead-out terminals of ground terminal and described the first primary side and described second subprime side by making described primary side are positioned at the both sides that face with each other and guarantee safe insulation; And
The insulation feedback unit, the described switch unit that is used for responding to any driving voltage of described a plurality of driving voltages and this driving voltage is sent to the described primary side that is positioned at described transformer,
Wherein, described insulation feedback unit makes the described primary side of described transformer and the described primary side insulation of described transformer.
2. lamp drive circuit according to claim 1, wherein, described switch unit comprises:
Switch control unit is used for exporting the first switching signal and the second switching signal by receiving the driving voltage of sensing via described insulation feedback unit, has the described square-wave voltage of predetermined amplitude with output;
The first switching device shifter is controlled as and switches on and off by receiving described the first switching signal; And
The second switching device shifter is controlled as and switches on and off by receiving described the second switching signal.
3. lamp drive circuit according to claim 1, wherein, the described transformer of described insulating transformer unit comprises:
The armature winding unit is wound with the coil of described primary side and is provided with described input terminal and described ground terminal;
First level winding element is wound with the coil of described the first primary side and is provided with described two lead-out terminals at a side place of described armature winding unit; And
The second subprime winding element is wound with the coil of described second subprime side at the opposite side place of described armature winding unit and is provided with described two lead-out terminals.
4. lamp drive circuit according to claim 3, wherein, described coil twines around described first level winding element and described second subprime winding element with similar number.
5. lamp drive circuit according to claim 3, wherein, the coil of described primary side begins at described input terminal place to twine and finishes to twine at described ground terminal place, and wherein said input terminal and described ground terminal are arranged on the same side of described transformer.
6. lamp drive circuit according to claim 3, wherein, the coil of the coil of described the first primary side and described second subprime side any place in described lead-out terminal begins to twine and finishes to twine at another place, and wherein said two lead-out terminals are arranged in the face of the described input terminal of described primary side and that side of described ground terminal.
7. lamp drive circuit comprises:
Rectification unit is used for input voltage is carried out rectification;
The PFC unit has: inductor is connected to described rectification unit; The PWM switching device shifter is connected to described inductor; Diode is connected to described inductor and described PWM switching device shifter; And capacitor, being connected to described diode, described PFC unit is dc voltage for the power factor that improves the voltage after described rectification unit rectification and with the described voltage transitions after the rectification;
Switch unit forms semibridge system or full-bridge type, is used for switching the described dc voltage of described PFC unit so that described dc voltage is converted to square-wave voltage;
The insulating transformer unit, it comprises a plurality of transformers and at least one resonant capacitor, and export a plurality of driving voltages that are used for driving respectively a plurality of lamps that comprise same magnitude by receiving from the square-wave voltage of described switch unit output, wherein, a plurality of described transformers comprise the input terminal of a primary side and all lead-out terminals of ground terminal and the first primary side and second subprime side, described the first primary side and described second subprime side respectively comprise two lead-out terminals, and a plurality of described transformers input terminal and all lead-out terminals of ground terminal and described the first primary side and described second subprime side by making a primary side are positioned at the both sides that face with each other and guarantee safe insulation; And
The insulation feedback unit, the described switch unit that is used for responding to any driving voltage of described a plurality of driving voltages and this driving voltage is sent to the described primary side that is positioned at described transformer,
Wherein, described insulation feedback unit makes the described primary side of described transformer and the described primary side insulation of described transformer.
8. lamp drive circuit according to claim 7, wherein, described switch unit comprises:
Switch control unit is used for exporting the first switching signal and the second switching signal by receiving the driving voltage of sensing via described insulation feedback unit, has the described square-wave voltage of predetermined amplitude with output;
The first switching device shifter is controlled as and switches on and off by receiving described the first switching signal; And
The second switching device shifter is controlled as and switches on and off by receiving described the second switching signal.
9. lamp drive circuit according to claim 7, wherein, each described transformer of described insulating transformer unit includes:
The armature winding unit is wound with the coil of described primary side and is provided with described input terminal and described ground terminal;
First level winding element, the side in described armature winding unit are wound with the coil of described the first primary side and are provided with two described lead-out terminals; And
Second subprime winding element, the opposite side in described armature winding unit are wound with the coil of described second subprime side and are provided with two described lead-out terminals.
10. lamp drive circuit according to claim 9, wherein, described coil twines around described first level winding element and described second subprime winding element with similar number.
11. lamp drive circuit according to claim 9, wherein, the coil of described primary side begins at described input terminal place to twine and finishes to twine at described ground terminal place, and wherein said input terminal and described ground terminal are arranged on the same side of described transformer.
12. lamp drive circuit according to claim 9, wherein, the coil of the coil of described the first primary side and described second subprime side any place in described lead-out terminal begins to twine and finishes to twine at another place, and wherein two described lead-out terminals are arranged in the face of the described input terminal of described primary side and that side of described ground terminal.
13. lamp drive circuit according to claim 7, wherein, in described insulating transformer unit, resonant capacitor is connected in series with the primary side of a plurality of described transformers that are connected of being one another in series.
14. lamp drive circuit according to claim 7, wherein, in described insulating transformer unit, described resonant capacitor is connected to the primary side of each described transformer, and wherein the described primary side that is connected to described resonant capacitor of a plurality of described transformers is connected in parallel.
15. lamp drive circuit according to claim 7, wherein, in described insulating transformer unit, a described resonant capacitor is connected in series with the primary side of a plurality of described transformers that are connected in parallel with each other.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080036046 | 2008-04-18 | ||
| KR1020080036046A KR100864905B1 (en) | 2008-04-18 | 2008-04-18 | Driving circuit of lamps |
| KR10-2008-0036046 | 2008-04-18 | ||
| KR1020090000261 | 2009-01-05 | ||
| KR1020090000261A KR20100081008A (en) | 2009-01-05 | 2009-01-05 | Driving circuit of lamps |
| KR10-2009-0000261 | 2009-01-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101578005A CN101578005A (en) | 2009-11-11 |
| CN101578005B true CN101578005B (en) | 2013-01-23 |
Family
ID=40177455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910134473XA Expired - Fee Related CN101578005B (en) | 2008-04-18 | 2009-04-17 | Lamp driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100864905B1 (en) |
| CN (1) | CN101578005B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116392A (en) * | 2011-11-16 | 2013-05-22 | 天津三星电子有限公司 | Multi-displayer centralized power supply system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1971380A (en) * | 2005-11-24 | 2007-05-30 | 三星电机株式会社 | Backlight assembly |
| CN101065994A (en) * | 2004-11-29 | 2007-10-31 | 皇家飞利浦电子股份有限公司 | Method and a driver circuit for LED operation |
| CN101080128A (en) * | 2006-05-26 | 2007-11-28 | 昂宝电子（上海）有限公司 | Cycle framework driving system and method of multi-tube CCFL and/or EEFL |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002134293A (en) * | 2000-10-30 | 2002-05-10 | Matsushita Electric Ind Co Ltd | Back light equipment |
| KR100840933B1 (en) * | 2002-01-31 | 2008-06-24 | 삼성전자주식회사 | Apparatus for driving lamp and liquid crystal display with the same |
-
2008
- 2008-04-18 KR KR1020080036046A patent/KR100864905B1/en not_active IP Right Cessation
-
2009
- 2009-04-17 CN CN200910134473XA patent/CN101578005B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101065994A (en) * | 2004-11-29 | 2007-10-31 | 皇家飞利浦电子股份有限公司 | Method and a driver circuit for LED operation |
| CN1971380A (en) * | 2005-11-24 | 2007-05-30 | 三星电机株式会社 | Backlight assembly |
| CN101080128A (en) * | 2006-05-26 | 2007-11-28 | 昂宝电子（上海）有限公司 | Cycle framework driving system and method of multi-tube CCFL and/or EEFL |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101578005A (en) | 2009-11-11 |
| KR100864905B1 (en) | 2008-10-22 |
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