CN201174815Y - System for driving discharge lamp - Google Patents
System for driving discharge lamp Download PDFInfo
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- CN201174815Y CN201174815Y CNU2008200922362U CN200820092236U CN201174815Y CN 201174815 Y CN201174815 Y CN 201174815Y CN U2008200922362 U CNU2008200922362 U CN U2008200922362U CN 200820092236 U CN200820092236 U CN 200820092236U CN 201174815 Y CN201174815 Y CN 201174815Y
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Abstract
The utility model relates to a drive system of a discharge lamp, which is used for driving a lighting tube module comprising a plurality of the lighting tubes, wherein the lighting tubes are divided into two sets and arranged; the drive system of the discharge lamp comprises an inverting circuit, an interface, a dispersion unit, a balance unit and an abnormal detection circuit, wherein the inverting circuit is used for providing power signals for the lighting tubes in the lighting tube module; and the interface is used for transmitting the power signals. The dispersion unit is used for receiving the power signals provided by the inverting circuit via the interface and dispersing the power signals to the lighting tubes. The balance unit is used for balancing current signals in the power signals which are provided for the lighting tubes. The abnormal detection circuit detects the power signals which are not dispersed by the dispersion unit, thereby detecting the state of at least one lighting tube. The drive system of the discharge lamp can accurately detect the abnormity of at least one lighting tube.
Description
Technical field
The utility model relates to a kind of discharge lamp drive system, especially is about a kind of LCD (Liquid Crystal Display, LCD) discharge lamp drive system of backlight module (Backlight module) of being used for.
Background technology
(Liquid Crystal Display, LCD) (Cold Cathode Fluorescent Lamp is CCFL) as the light source of (Backlight) backlight system with discharge lamp (Discharge Lamp), particularly cold-cathode fluorescence lamp for panel in liquid crystal display.Typically, cold-cathode fluorescence lamp is driven by converter circuit (Inverter Circuit), and it can supply AC signal to fluorescent tube.
In relatively large display panels, two or more cold-cathode fluorescence lamps need be set so that enough brightness to be provided.So converter circuit has many group outputs usually, drive fluorescent tube to supply enough AC signal.Yet, because of converter circuit has many group outputs, when one group of output abnormality wherein, as: no-output or short circuit, the fluorescent tube cisco unity malfunction that it is corresponding, thus make the display panels brightness irregularities.
Simultaneously, unusually also might occur on fluorescent tube or other element, influence the entire backlight system.For example: fluorescent tube damages and makes its impedance become big, stops electric current to flow through.Moreover, the impedance meeting of fluorescent tube changes along with the change in its life-span, influences its operate as normal and illumination effect.That is, some fluorescent tube will wear out in the back light system use, and illumination effect is variation gradually.Because back light system usually adopts a plurality of fluorescent tubes, certain fluorescent tube be difficult for being found for the influence of back light system characteristic electron (as: voltage and electric current) unusually, thereby cause the abnormal condition of lamp tube detecting relatively more difficult.
Usually, detect the method that certain abnormal condition of lamp tube adopts and be: in the converter output detecting total current value of fluorescent tube of flowing through, thereby it is unusual to have judged whether that fluorescent tube takes place; Or be, respond to its electric current and/or magnitude of voltage, whether take place unusually by the described fluorescent tube of detecting voltage of flowing through each lamp tube current and/or be added on each fluorescent tube at the low-pressure end of fluorescent tube.Yet the former takes place when unusual at a fluorescent tube, because that the fluorescent tube total current value of flowing through changes is very little, is difficult for detecting, causes the entire circuit misoperation; The latter makes the detecting circuit comparatively complicated.
The utility model content
In view of this, a kind of discharge lamp drive system need be provided, the unusual of at least one fluorescent tube can be detected.
A kind of discharge lamp drive system is used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, and wherein, described fluorescent tube is divided into two groups of settings, and described discharge lamp drive system comprises inverter circuit, interface, dispersal unit, balancing unit and abnormal detection circuit.Wherein, inverter circuit is used for providing the fluorescent tube of power supply signal to fluorescent tube module.Described interface is used to transmit power supply signal.Described dispersal unit is used for receiving the power supply signal that inverter circuit provided by described interface, and is dispersed to described fluorescent tube.Described balancing unit is used for the current signal that balance offers the power supply signal of fluorescent tube.Described abnormal detection circuit is by detecting the power supply signal do not disperseed by described dispersal unit, thereby detects the state of at least one fluorescent tube.
A kind of discharge lamp drive system, be used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, described fluorescent tube module has a plurality of outputs, and described output is divided at least two efferents, described discharge lamp drive system comprises abnormal detection circuit, be used to detect one or more outputs of described fluorescent tube module, it comprises the magnetic element circuit, is used for producing induced signal according to the flux change that described efferent produces thereon.
A kind of discharge lamp drive system is used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, and described fluorescent tube is divided at least two groups, and described discharge lamp drive system comprises inverter circuit and abnormal detection circuit.Wherein, described inverter circuit is used to provide a plurality of drive signals to described fluorescent tube.Described abnormity detecting circuit is used for by relatively offering the segment drive signal of described light tube group, thereby detects the state of at least one fluorescent tube.
Discharge lamp drive system described in the utility model by the variation of the drive signal magnetic flux that produces on abnormal detection circuit in the comparison power supply signal, thereby detects the unusual of at least one fluorescent tube.
Description of drawings
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the functional block diagram of discharge lamp drive system in the utility model one execution mode.
Fig. 2 is the functional block diagram of discharge lamp drive system in another execution mode of the utility model.
Fig. 3 is the physical circuit figure of the utility model Fig. 1 backlight module.
Fig. 4 is another physical circuit figure of the utility model Fig. 1 backlight module.
Fig. 5 is the functional block diagram of the utility model abnormal detection circuit.
Fig. 6 A is a physical circuit figure of the utility model abnormity detecting circuit.
Fig. 6 B is another physical circuit figure of the utility model abnormity detecting circuit.
Fig. 6 C is another physical circuit figure of the utility model abnormity detecting circuit.
Fig. 6 D is another physical circuit figure of the utility model abnormity detecting circuit.
Fig. 7 is another physical circuit figure of the utility model Fig. 1.
Fig. 8 is another physical circuit figure of the utility model Fig. 1 backlight module.
Fig. 9 is another physical circuit figure of the utility model Fig. 1 backlight module.
Figure 10 is the physical circuit figure of fluorescent tube module and abnormity detecting circuit in the utility model one execution mode.
Figure 11 is the physical circuit figure of fluorescent tube module and abnormity detecting circuit in another execution mode of the utility model.
Figure 12 is the physical circuit figure of fluorescent tube module and abnormity detecting circuit in another execution mode of the utility model.
Figure 13 is the physical circuit figure of fluorescent tube module and abnormity detecting circuit in another execution mode of the utility model.
Figure 14 is the physical circuit figure of fluorescent tube module and abnormity detecting circuit in another execution mode of the utility model.
Figure 15 is the balancing circuitry plate of the utility model one execution mode.
Figure 16 A-16B is the profile of the balancing circuitry plate of the utility model one execution mode.
Figure 17 is the profile of the balancing circuitry figure of another execution mode of the utility model.
Figure 18 is the configuration relation of the utility model balancing circuitry plate and abnormity detecting circuit.
Figure 19 A-19D is the schematic diagram of each layer of balancing unit in the utility model one execution mode.
Figure 20 A-20D is the schematic diagram of balancing unit in another execution mode of the utility model.
Embodiment
Fig. 1 is applied to display unit in the utility model one execution mode, for example: LCD (LiquidCrystal Display, LCD) functional block diagram of middle backlight module 100.Power-supply unit 11 provides power supply signal (for example: AC signal) to fluorescent tube module 15 by interface 12, dispersal unit (splitter) 13 and balancing unit 14.Wherein, fluorescent tube module 15 comprises a plurality of fluorescent tube L, and described fluorescent tube is the fluorescent tube of cold-cathode fluorescence lamp (CCFL) or other type.Power-supply unit 11 comprises inverter circuit 111, protective circuit 112 and abnormal detection circuit 113.In the present embodiment, inverter circuit 111 is used to produce the power supply signal that can drive fluorescent tube module 15.Abnormal detection circuit 113 passes through the power supply signal of detecting inverter circuit 111 outputs, and then detects the state of at least one fluorescent tube L, and exports protective circuit 112 to.Therefore, protective circuit 112 can be protected whole backlight module 100 according to the state of the fluorescent tube L that it receives, for example: stop inverter circuit 111 work etc.
In the present embodiment, abnormal detection circuit 113 is detected the state of described fluorescent tube L by detecting described power supply signal, and described power supply signal is produced by at least one transformer in the inverter circuit 11.Described dispersal unit 13 is made up of more than the electronic component of input conductor, high-voltage line, a plurality of circuit or any output.Inverter circuit 11 produces two drive signals (polarity is identical or polarity is opposite) and is used to drive described light tube group S1, S2, and, described drive signal by path 121 and 122 and dispersal unit 13 export fluorescent tube module 15 to.For example, inverter circuit 11 produces two drive signals that polarity is identical, that is, in synchronization t (t is for changing in the real number scope), described drive signal amplitude, phase place are all synchronous.Simultaneously, described drive signal can also be selected opposed polarity, and for example: inverter circuit 11 is in moment t, produces two phase place differences, drive signal that amplitude is identical.It should be noted that two identical or opposite drive signals of polarity can be identical or different at the amplitude of synchronization t.In other execution mode of the utility model, the number that inverter circuit 11 produces drive signal is not limited to two.
In the present embodiment, described opposite polarity two drive signals drive light tube group S1, the S2 in the described fluorescent tube module 15 respectively.Unusual when one of them fluorescent tube L generation, its impedance promptly can change, and the signal that then drives described group of fluorescent tube also changes.Abnormal detection circuit 113 is by comparing with another drive signal, and the variation of the unusual caused drive signal of fluorescent tube takes place in detecting, thereby the output abnormality signal is to protective circuit 112.What note is, each quantity of organizing fluorescent tube can be identical, also can be different.In the execution mode of the present utility model, the fluorescent tube in the fluorescent tube module 15 is divided at least two groups.
Annexation between the configuration of backlight module 100 and dispersal unit 13, balancing unit 14 and the fluorescent tube module 15 also can change, consult the functional block diagram that Figure 2 shows that backlight module 100 in another execution mode of the utility model, itself and Fig. 1 are roughly the same, and difference is: balancing unit 14 is connected to the low-pressure end of fluorescent tube module 15.
Figure 3 shows that the physical circuit figure of backlight module 100 among the utility model Fig. 1.Wherein, inverter circuit 111 comprises at least one transformer, and in the present embodiment, the quantity of described transformer is two, and it is respectively to having inferior utmost point winding W1, W2.Described transformer is by odd number and even number fluorescent tube in its high-voltage output end aa and the corresponding driving of the cc output drive signal fluorescent tube module 15.Because each winding has two ends, wherein, an end is the output high-voltage signal for the other end, and then described end is called high-pressure side; Otherwise, be called low-pressure end.In the present embodiment, abnormal detection circuit 113 comprises voltage sensing circuit 113a and current detection circuit 113c.Wherein, current detection circuit 113c receives and detects the drive signal of being exported from transformer time utmost point winding W1, W2 low-voltage output bb and dd, and described drive signal polarity is opposite, and is right, in other execution mode of the utility model, not limited thereto.Whether current detection circuit 113c detects the similarities and differences of its drive signal that receives, take place unusually thereby detect fluorescent tube.Voltage sensing circuit 113a detects abnormal voltage and exports protective circuit 112 to, in case receive described electric voltage exception signal, protective circuit 112 can be protected inverter circuit 111.Similarly, current detection circuit 113c detects the unusual of electric current and exports protective circuit 112 to, receives described current anomaly signal, and protective circuit 112 is also protected inverter circuit 111.
In the present embodiment, dispersal unit 13a and balancing unit 14a are dispersal unit 13 and balancing unit 14 among Fig. 1.Wherein, dispersal unit 13a and balancing unit 14a all are integrated on the balancing circuitry plate 16.
Figure 4 shows that another physical circuit figure of backlight module 100 among the utility model Fig. 1.Wherein, current detection circuit 113c receives and detects the drive signal of being exported from transformer time utmost point winding W1, W2 high-voltage output end aa and cc.In the present embodiment, described opposite from transformer time utmost point winding W1, W2 high-voltage output end aa, right, not limited thereto with the drive signal polarity that cc is exported.The similarities and differences that current detection circuit 113c detects its drive signal that receives can detect the unusual of fluorescent tube.
Figure 5 shows that the functional block diagram of the utility model current detection circuit 113c.Described current detection circuit 30 comprises magnetic element circuit 300 and signal deteching circuit 310.Described magnetic element circuit 300 links to each other with input ee, ff and output gg, hh.When certain fluorescent tube takes place when unusual, at least one drive signal changes, and the magnetic flux of magnetic element circuit 300 also can change, and based on the variation of described magnetic flux, magnetic element circuit 300 can produce induced signals.Correspondingly, 310 of signal deteching circuits can produce abnormal signal and export protective circuit 112 to according to described induced signal.
Fig. 6 A is the physical circuit figure of the utility model Fig. 5.Wherein, described magnetic element circuit 300 comprises at least two drive signal windings and an induction winding, and each winding can have a coil, perhaps has a plurality of coils of mutual polyphone.In the present embodiment, described drive signal winding number is two, is respectively the first magnetic element winding 302, the second magnetic element winding 304, and described induction winding is the 3rd magnetic element winding 306.Wherein, winding 302,304 and 306 is coupled on the magnetic core, or other.Described drive signal winding correspondence respectively is connected between described drive signal and the described light tube group, in the present embodiment, the described first magnetic element winding 302 is connected between input ee and the output gg, and the described second magnetic element winding 304 is connected between input ff and the output hh.If in magnetic element circuit 300, in case detect transformable magnetic flux, 306 of described the 3rd magnetic element windings can produce described induced signal.Wherein, described induced signal is for being current signal.
The setting of the coiling ratio of the first magnetic element winding 302 and the second magnetic element winding 304 is with following principle: when all fluorescent tube L are under the normal operating conditions, the magnetic flux that the first magnetic element winding 302 and the second magnetic element winding 304 are produced on the 3rd magnetic element winding 306 can be cancelled out each other.
In the present embodiment, the coiling ratio of the first magnetic element winding 302 and the second magnetic element winding 304 is inversely proportional to for the amplitude that exports the drive signal of light tube group S1 and light tube group S2 in synchronization t (t is a variable value) to.Change speech, the coiling ratio of the first magnetic element winding 302 and the second magnetic element winding 304 roughly with the total impedance of light tube group S1 and the proportional setting of total impedance of light tube group S2.Especially, the coiling ratio of the first magnetic element winding 302 and the second magnetic element winding 304 is for being inversely proportional to current value that offers light tube group S1 and the current value that offers light tube group S2.For example, be I1 if offer the total current of light tube group S1, the total current that offers light tube group S2 is I2, so, the coiling ratio between the first magnetic element winding 302 and the second magnetic element winding 304 is for being I2: I1.Because the number of turn of the 3rd magnetic element winding 306 can influence the intensity of described unusual induced signal, thereby the selection of its number of turn is can make the described output abnormality of abnormal detection circuit 30 sensings and can misoperation not to be as the criterion.
In the present embodiment, signal deteching circuit 310 is used for the described induced signal of sensing, and it comprises rectification circuit 312 and resistance R 1.Described rectification circuit 312 comprises four access point a, b, c and d, wherein, access point a, c separately, access point b, d are separately.Access point b and access point d are connected to the two ends of the 3rd magnetic element winding 306 respectively.One end of resistance R 1 connects access point a, and the other end connects access point c and ground connection, and the two ends of resistance R 1 are connected to protective circuit 230.Rectification circuit 312 comprises four diode D1, D2, D3 and D4.The negative electrode of diode D1 connects access point a, and anode connects access point b.The negative electrode of diode D2 connects access point b, and anode connects access point c.The anode of diode D3 connects access point c, and negative electrode connects access point d.The anode of diode D4 connects access point d, and negative electrode connects access point a.In other execution mode of the utility model, rectification circuit 312 also can be made up of other switch element.In the present embodiment, described abnormal signal is a voltage signal, is the voltage at resistance R 1 two ends.
When all fluorescent tube L operate as normal, its two groups of drive signals are cancelled each other in the magnetic flux that magnetic element circuit 300 produces, and the 3rd magnetic element winding 306 does not have signal to produce, and signal deteching circuit 310 does not have abnormal signal output, and promptly resistance R 1 both end voltage is 0.
When at least one fluorescent tube L takes place when unusual, its two groups of drive signals can not cancelled each other in the magnetic flux that magnetic element circuit 300 produces, the magnetic flux of magnetic element circuit 300 changes, the 3rd magnetic element winding 306 sensor current signals, the diode D1 of rectification circuit 312 and diode D3 conducting, or diode D2 and diode D4 conducting, resistance R 1 two ends have voltage to produce, and promptly signal deteching circuit 310 produces abnormal signal.Protective circuit 112 can be taked the corresponding protection measure according to the voltage signal at circuit R1 two ends, as stops the work of entire circuit.
With reference to figure 6B and 6C, other execution mode of rectification circuit 312 shown in circuit 310a and the 310b.With reference to figure 6D, circuit 30a is depicted as the current detection circuit 30 of another execution mode, but the identical signal of its receiving polarity.
Figure 7 shows that the physical circuit figure of backlight module 100 among the utility model Fig. 3.Current detection circuit 113d is the physical circuit figure of the current detection circuit 113c among the utility model Fig. 3.Transformer secondary output winding low-voltage output bb links to each other with the winding W3 of current detection circuit 113d by input ee.Transformer secondary output winding low-voltage output dd links to each other with the winding W4 of current detection circuit 113d by input ff.Winding W3, W4, W5 are coupled in magnetic core, or other.The magnetic flux of winding W5 that will make unusually of any fluorescent tube L changes, and current detection circuit 113d promptly can produce abnormal signal to protective circuit 112.
Figure 8 shows that another physical circuit figure of backlight module 100 among the utility model Fig. 3.Current detection circuit 113e is another physical circuit figure of the current detection circuit 113c among the utility model Fig. 3.Transformer secondary output winding low-voltage output bb links to each other with the input of amplifier A1 among the current detection circuit 113e.Transformer secondary output winding low-voltage output dd links to each other with inverter IN1, and described inverter IN1 links to each other with the input of amplifier A2 among the current detection circuit 113e.Differential amplifier C1 links to each other with the output of amplifier A1, A2, is used for the signal of comparison amplifier A1, A2 output.When the difference of vibration of amplifier A1, A2 output signal during greater than a default value, differential amplifier C1 produces induced signal to protective circuit 112.
Consult Fig. 9, current detection circuit 113c also can link to each other with primary winding in the inverter circuit 111.Inverter circuit 111 comprises transformer T1 and T2, is used for driving respectively the different light tube group of fluorescent tube module 15.The input ee of current detection circuit 113c and the corresponding respectively end that is connected to transformer T1 and the elementary winding of T2 of ff.What note is that the input ee of current detection circuit 113c can link to each other with the low-pressure end or the high-pressure side of described primary winding with ff.Current detection circuit 113c detects abnormal current, and exports protective circuit 112 to.When receiving described abnormal current, 112 pairs of inverter circuits 11 of protective circuit are protected.
Equally, current detection circuit 113c also can detect the output of fluorescent tube module 15 among the utility model Fig. 3.With reference to Figure 10, node OUT_1 and OUT_2 are the output of fluorescent tube module 15.In the present embodiment, fluorescent tube module 15 passes through the node OUT_1 signal opposite with the OUT_2 output polarity to current detection circuit 113c.So, the signal that the also exportable polarity of fluorescent tube module 15 is identical is to abnormity detecting circuit 113c.With reference to Figure 11, node OUT_1 and OUT_2 are the output of fluorescent tube module 15.Fluorescent tube module 15 passes through the node OUT_1 signal identical with the OUT_2 output polarity to abnormity detecting circuit 113c.
Each node OUT_1 can be connected one or more fluorescent tube with OUT_2, shown in Figure 12 to 14.Wherein, the winding ratio of the first magnetic winding 302, the second magnetic winding 304 is inversely proportional to for the fluorescent tube output quantity that links to each other with node OUT_1, the fluorescent tube output quantity that node OUT_2 links to each other.
In the utility model, current detection circuit also can be obtained signal from other element of backlight module, and with reference to Figure 18, current detection circuit 113c obtains signal from balancing circuitry plate 16a.The input of each current detection circuit 113c can connect the output of one or more balancing circuitry plate 16a.The output of each balancing circuitry plate 16a is electrical connected with the balancing component on it or magnetic links to each other.
In addition, in the present embodiment, balancing circuitry plate 16a can prevent that the arcing phenomenon from taking place.Balancing unit among the balancing circuitry plate 16a can have following execution mode: capacitive balance framework, inductance balance framework, Jin balance framework or other.Wherein, the capacitive balance framework is for adopting electric capacity as balancing component; The inductance balance framework is for adopting inductance as balancing component; Jin balance framework is for adopting transformer as balancing component.In the capacitive balance circuit, capacity cell can be installed in the PCB surface, described class component be surface adhesion components (SurfaceMount Device, SMD); Or be to install by PCB, described class component is the Dip element.In the present embodiment, dispersal unit and balancing unit are integrated in printed circuit board (PCB), except in order to connect the connector of fluorescent tube L or interface 12, need not SMD element or Dip element with the protection backlight module on it.The SMD element is a circuit element, and for example: electric capacity, chip, the electrode of described circuit element (perhaps pin) is not to penetrate circuit board for being welded on the surface of circuit board.The Dip element also is formed at circuit board (for example PCB), and its electrode (perhaps pin) penetrates circuit board and welds.In the present embodiment, balancing unit 14 comprises a plurality of embedded capacitances that are formed in the sandwich construction, and described sandwich construction comprises a plurality of by conductive layer that dielectric was separated out.
With reference to Figure 15, in the present embodiment, balancing unit 16b comprises the multilayer circuit board with a plurality of electric capacity.Two electrodes of each electric capacity are formed at PCB 16b respectively, and by appointing through hole E1, E2...En to connect corresponding fluorescent tube.
With reference to figure 16A-16B, in the present embodiment, PCB 16b comprises four layers of LR_1～LR_4, forms conducting element on it.LR_1～LR_4 layer is insulated medium DLR_1～DLR_3 and separates.
Among Figure 16 B, each electric capacity comprises two metal levels, and its correspondence forms at second, third conductive layer LR_2, the LR_3 of PCB 16b, is used for temporary transient stored electrons.Among Figure 16 B, vertical two adjacent metal levels are two electrodes of electric capacity (for example C1).Wherein, an electrode links to each other with a through hole (for example E1), and another electrode links to each other with a high-voltage line, and described high-voltage line is for connecting to come out from inverter circuit 111.The structure of each layer of the utility model PCB 16b shown in Figure 19 A-19D difference.
Among the PCB16b of Figure 19 A-19D, each through hole 191-198 is for being extended to the lower surface of LR_4 layer by LR_2, LR_3 layer by the upper space of LR_1 layer.The LR_1 of each through hole～LR_4 layer is by being filled by electric conducting material.In the utility model, interface 12 mesohigh lines 121 and 122 are connecting through hole 197 and 198 respectively.Each through hole 191-196 links to each other with a fluorescent tube in the fluorescent tube module 15.When high-voltage line 121 was opposite with 122 signal polarities that transmit, any two the adjacent through holes that link to each other with through hole 197,198 also provided opposite polarity signal to fluorescent tube.
Among Figure 19 A, the LR_1 of the superiors of PCB 16b does not carry any SMD or Dip element except connector.
Among Figure 19 B, the second layer LR_2 of PCB 16b comprises a plurality of metal level P11, P12, P13, P14, P15 and P16, and described metal level is a printed foil.As can be seen from Figure, described metal level includes two zones, and links to each other by narrow lead.Metal level P11, P13, P15 correspondence link to each other with through hole 191,193,195, and simultaneously, metal level P12, P14, P16 all link to each other with through hole 198.
Among Figure 19 C, the 3rd layer of LR_3 of PCB 16b comprises a plurality of metal level P21, P22, P23, P24, P25 and P26.Described metal level is for being Copper Foil.Metal level P21, P23, P25 all link to each other with through hole 197, and simultaneously, metal level P22, P24, P26 correspondence link to each other with through hole 192,194,196.
Among Figure 19 D, PCB 16b bottom LR_4 does not also carry any SMD or Dip element.
The electrode of the different electric capacity that link to each other with identical high-voltage line may be positioned at different layers, and Figure 20 A-20D is depicted as another execution mode of PCB 16b.
In the PCB16b of Figure 20 A-20D, each through hole 201-209 is for being extended to the lower surface of LR_4 layer by LR_2, LR_3 layer by the upper space of LR_1 layer.The LR_1 of each through hole～LR_4 layer is by being filled by electric conducting material.In the utility model, interface 12 mesohigh lines 121 and 122 are connecting through hole 207 and 208 respectively.Each through hole 201-206 links to each other with a fluorescent tube in the fluorescent tube module 15.When high-voltage line 121 was opposite with 122 signal polarities that transmit, any two the adjacent through holes that link to each other with through hole 207,208 also provided opposite polarity signal to fluorescent tube.
Among Figure 20 A, the LR_1 of the superiors of PCB 16b does not carry any SMD or Dip element.
Among Figure 20 B, the second layer LR_2 of PCB 16b comprises a plurality of metal level P11, P12, P13, P14, P15 and P16, and described metal level is a printed foil.Metal level P11, P13, P15, P16 correspondence link to each other with through hole 201,203,205,206, and simultaneously, metal level P12, P14 correspondence link to each other with through hole 208,209.
Among Figure 20 C, the 3rd layer of LR_3 of PCB 16b comprises a plurality of metal level P21, P22, P23, P24, P25 and P26.Described metal level is for being Copper Foil.Metal level P21, P23, P25 all link to each other with through hole 207, and simultaneously, metal level P22, P24 correspondence link to each other with through hole 202,204.Metal level P26 links to each other with through hole 209.
Among Figure 20 D, PCB 16b bottom LR_4 does not carry any SMD or Dip element.Lead among through hole 207,208,209 and Figure 20 A-20D is the dispersal unit 13 in the present embodiment.
It should be noted that balancing unit 14 is not limited in the PCB16b with four conductive layers of present embodiment.For example: the balancing unit 14 shown in Figure 17 comprises a plurality of C1, C2, C3...Cn.The electrode of described electric capacity is formed at LR_2～LR_5, and the electrode of two adjacent capacitor forms in different layers.
In sum, in the utility model multi-discharge lamp drive system, when at least one fluorescent tube takes place when unusual, the induced signal that the variation by drive signal winding magnetic flux that produces on the induction winding produces, can accurately detect described unusually.
Claims (22)
1. a discharge lamp drive system is used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, and wherein, described fluorescent tube is divided into two groups of settings at least, it is characterized in that: described discharge lamp drive system comprises:
Inverter circuit is used for providing the fluorescent tube of power supply signal to described fluorescent tube module;
Interface is used to transmit described power supply signal;
Dispersal unit is used for receiving the power supply signal that described inverter circuit provides by described interface, and is dispersed to described fluorescent tube;
Balancing unit comprises a plurality of electric capacity, is used for the current signal that balance offers the power supply signal of described fluorescent tube; And
Abnormal detection circuit by detecting the power supply signal do not disperseed by described dispersal unit, thereby detects the state of at least one fluorescent tube.
2. discharge lamp drive system as claimed in claim 1 is characterized in that: described power supply signal comprises the current signal that is produced by inverter circuit.
3. discharge lamp drive system as claimed in claim 1, it is characterized in that: described power supply signal comprises at least two drive signals, is used to drive described light tube group, wherein, described abnormal detection circuit detects the variation of drive signal that abnormal condition of lamp tube causes by more described drive signal.
4. discharge lamp drive system as claimed in claim 3 is characterized in that: described drive signal is opposite polarity signal.
5. discharge lamp drive system as claimed in claim 3 is characterized in that: abnormal detection circuit comprises the magnetic element circuit, is used for that the variation of the magnetic flux that produces thereon produces induced signal according to described drive signal, and described abnormal detection circuit comprises:
At least two drive signal windings, the described drive signal of its corresponding respectively reception; And
The induction winding is used for that the variation of the magnetic flux that produces thereon produces described induced signal according to described drive signal.
6. discharge lamp drive system as claimed in claim 5 is characterized in that: the described drive signal winding number of turns roughly is inversely proportional to the electric current of its corresponding light tube group of flowing through.
7. discharge lamp drive system as claimed in claim 3 is characterized in that: described abnormity detecting circuit more comprises differential amplifier, is used for producing induced signal according to the difference of the described drive signal amplitude of synchronization.
8. discharge lamp drive system as claimed in claim 1, it is characterized in that: described abnormity detecting circuit links to each other with Secondary winding of transformer in the described inverter circuit, wherein, described power supply signal is detected from the low-pressure end or the high-pressure side of described transformer secondary output winding.
9. discharge lamp drive system as claimed in claim 1, it is characterized in that: described abnormity detecting circuit links to each other with the elementary winding of transformer in the described inverter circuit, wherein, described power supply signal is detected from the low-pressure end or the high-pressure side of described primary winding.
10. discharge lamp drive system as claimed in claim 1 is characterized in that: the power supply signal of described power supply signal for transmitting by described interface, and described abnormity detecting circuit links to each other with described interface and is used to extract described power supply signal.
11. discharge lamp drive system as claimed in claim 1 is characterized in that: described electric capacity is the embedded capacitance that is formed in the sandwich construction, and wherein, described sandwich construction comprises a plurality of by conductive layer that dielectric was separated out.
12. discharge lamp drive system as claimed in claim 11 is characterized in that: each electric capacity comprises two metallic plates, and it lays respectively at two conductive layers in the described sandwich construction.
13. discharge lamp drive system as claimed in claim 11 is characterized in that: each electric capacity comprises two metallic plates as electrode, and the electrode of adjacent two electric capacity is formed at respectively in the different conductive layers of described sandwich construction.
14. a discharge lamp drive system is used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, described fluorescent tube module has a plurality of outputs, and described output is divided at least two efferents at least, and described discharge lamp drive system comprises:
Balancing unit comprises a plurality of electric capacity, and being used for balance provides each lamp tube current; And
Abnormal detection circuit is used to detect one or more outputs of described fluorescent tube module, and it comprises the magnetic element circuit, is used for producing an induced signal according to the flux change that described efferent produces thereon.
15. discharge lamp drive system as claimed in claim 14 is characterized in that: described magnetic element circuit comprises:
At least two drive signal windings, correspondence is connected in described efferent respectively;
The induction winding is used for producing described induced signal according to the flux change that described efferent produces thereon.
16. discharge lamp drive system as claimed in claim 15 is characterized in that: the winding ratio of described drive signal winding roughly is inversely proportional to the output quantity of described efferent.
17. discharge lamp drive system as claimed in claim 14 is characterized in that: described electric capacity is the embedded capacitance that is formed in the sandwich construction, and wherein, described sandwich construction comprises a plurality of by conductive layer that dielectric was separated out.
18. discharge lamp drive system as claimed in claim 17 is characterized in that: each electric capacity comprises two metallic plates, and it lays respectively at two conductive layers in the described sandwich construction.
19. a discharge lamp drive system is used to drive the fluorescent tube module that comprises a plurality of fluorescent tubes, described fluorescent tube is divided at least two groups, it is characterized in that: described discharge lamp drive system comprises:
Inverter circuit is used to provide a plurality of drive signals to described fluorescent tube;
Balancing unit comprises a plurality of electric capacity, links to each other with described inverter circuit, is used for the drive signal that balance offers described fluorescent tube; And
The abnormity detecting circuit links to each other with described inverter circuit, is used for by the rating unit drive signal, thereby detects the state of at least one fluorescent tube.
20. discharge lamp drive system as claimed in claim 19 is characterised in that: described abnormity detecting circuit comprises the magnetic element circuit, is used for producing unusual induced signal according to the flux change that described segment drive signal produces thereon.
21. discharge lamp drive system as claimed in claim 20 is characterized in that: described magnetic element circuit comprises:
At least two drive signal windings, the described segment drive signal of corresponding respectively reception;
The induction winding is used for producing described induced signal according to the flux change that described segment drive signal produces thereon.
22. discharge lamp drive system as claimed in claim 21 is characterized in that: the winding ratio of described drive signal winding roughly is inversely proportional to the amplitude of the described segment drive signal of synchronization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200922362U CN201174815Y (en) | 2008-02-01 | 2008-02-01 | System for driving discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200922362U CN201174815Y (en) | 2008-02-01 | 2008-02-01 | System for driving discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201174815Y true CN201174815Y (en) | 2008-12-31 |
Family
ID=40201946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200922362U Expired - Fee Related CN201174815Y (en) | 2008-02-01 | 2008-02-01 | System for driving discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201174815Y (en) |
-
2008
- 2008-02-01 CN CNU2008200922362U patent/CN201174815Y/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081231 Termination date: 20140201 |