CN201263238Y - Multi-lamp tube backlight device - Google Patents
Multi-lamp tube backlight device Download PDFInfo
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- CN201263238Y CN201263238Y CNU2008201259352U CN200820125935U CN201263238Y CN 201263238 Y CN201263238 Y CN 201263238Y CN U2008201259352 U CNU2008201259352 U CN U2008201259352U CN 200820125935 U CN200820125935 U CN 200820125935U CN 201263238 Y CN201263238 Y CN 201263238Y
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Abstract
The utility model provides a multi-lamp tube backlight device, which comprises a power supply, a first lamp tube, a second lamp tube, a transformer, a first sensing module, a second sensing module and a control module, wherein, the transformer comprises a first lateral coil, a second lateral coil and an auxiliary coil. The second lateral coil comprises a first sub-coil which is coupled with the first lamp tube and a second sub-coil which is coupled with the second lamp tube and the first sub-coil. The first sensing module which is used for sensing a first voltage and producing a first sensing signal is coupled between the first sub-coil and the second sub-coil, while the second sensing module is coupled with the auxiliary coil and is used for sensing a second voltage and producing a second sensing signal. And the control module selectively turns off the power supply according to the first sensing signal or the second sensing signal.
Description
Technical field
The utility model relates to many fluorescent tubes back lighting device, particularly relates to a kind of many fluorescent tubes back lighting device that improves circuit protection function that has.
Background technology
Because the image Display Technique is constantly progressive, the size of display panels also increases thereupon constantly.In order to provide display panels required high-quality light source, (ColdCathode Fluorescent Lamp, many fluorescent tubes back lighting device CCFL) is used to the light source as liquid crystal display to comprise a plurality of cold cathode fluorescent lamp.
In many fluorescent tubes back lighting device, balancing transformer is used to keep each lamp tube current all about equally, can have quite stable and brightness uniformly to guarantee the light source that offers display panels.In order to reduce the quantity of the balancing transformer in many fluorescent tubes back lighting device, there has been the many fluorescent tubes back lighting device that to control the electric current of two fluorescent tubes (pushes away two) or four fluorescent tubes (pushes away four) by a balancing transformer simultaneously at present, to simplify the structure of balancing circuitry, significantly reduce product cost.
In actual applications; no matter be one to push away two or one and push away many fluorescent tubes back lighting device of four; when arbitrary fluorescent tube wherein is short-circuited or during the phenomenon that opens circuit, must there be a protection mechanism can detect the short circuit of fluorescent tube or opens circuit and close the power supply of this many fluorescent tubes back lighting device in real time.For example, one pushes away many fluorescent tubes back lighting device of two can adopt tapped protective circuit, mainly comprises a plurality of resistance or electric capacity, is connected to the contact that backguy comes out to form in the middle of the coil of self-balancing transformer.
Yet; if when only adopting tapped protective circuit to protect many fluorescent tubes back lighting device; its greatest problem that may face is; when two fluorescent tubes corresponding to this balancing transformer all open circuit simultaneously; tapped protective circuit can't correctly detect opening circuit of fluorescent tube, thereby can't reach the purpose of this many fluorescent tubes back lighting device of protection.
Therefore, the utility model provides a kind of many fluorescent tubes back lighting device that improves circuit protection function that has, to address the above problem.
The utility model content
The utility model proposes a kind of many fluorescent tubes back lighting device that improves circuit protection function that has.According to a specific embodiment of the present utility model is a kind of pair of fluorescent tube back lighting device.This pair fluorescent tube back lighting device comprises power supply, first fluorescent tube, second fluorescent tube, transformer, first sensing module, second sensing module and control module.
This transformer comprises first lateral coil, second lateral coil and ancillary coil.Wherein first lateral coil is coupled to this power supply.Second lateral coil comprises first subcoil and second subcoil, and wherein first subcoil is coupled to first fluorescent tube, and second subcoil is coupled to second fluorescent tube and first subcoil.
In this embodiment, first sensing module is coupled between first subcoil and second subcoil, produces first sensing signal in order to sensing first voltage and according to first voltage; Second sensing module is coupled to ancillary coil, produces second sensing signal in order to sensing second voltage and according to second voltage.Then be coupled to power supply, first sensing module and second sensing module as for control module.The function of control module is according to first sensing signal or second sensing signal powered-down optionally.
According to another specific embodiment of the present utility model is a kind of four fluorescent tube back lighting devices.This four fluorescent tubes back lighting device comprises power supply, first fluorescent tube, second fluorescent tube, the 3rd fluorescent tube, the 4th fluorescent tube, transformer, first sensing module, second sensing module, the 3rd sensing module, the 4th sensing module and control module.
This transformer comprises first lateral coil, second lateral coil, first ancillary coil and second ancillary coil.Wherein first lateral coil is coupled to this power supply; This second lateral coil comprises first subcoil, second subcoil, the 3rd subcoil and the 4th subcoil, and wherein first subcoil is coupled to first fluorescent tube; Second subcoil is coupled to second fluorescent tube and first subcoil; The 3rd subcoil is coupled to the 3rd fluorescent tube; The 4th subcoil is coupled to the 4th fluorescent tube and the 3rd subcoil.
In this embodiment, first sensing module is coupled between first subcoil and second subcoil, produces first sensing signal in order to sensing first voltage and according to first voltage; Second sensing module is coupled to first ancillary coil, produces second sensing signal in order to sensing second voltage and according to second voltage; The 3rd sensing module is coupled between the 3rd subcoil and the 4th subcoil, produces the 3rd sensing signal in order to the sensing tertiary voltage and according to tertiary voltage; The 4th sensing module is coupled to second ancillary coil, produces the 4th sensing signal in order to sensing the 4th voltage and according to the 4th voltage.
Then be coupled to power supply, first sensing module, second sensing module, the 3rd sensing module and the 4th sensing module as for control module.The function of control module is according to first sensing signal, second sensing signal, the 3rd sensing signal or the 4th sensing signal powered-down optionally.
Compared to prior art; can provide according to many fluorescent tubes back lighting device of the present utility model and to improve circuit protection function; no matter this many fluorescent tubes back lighting device belongs to one and pushes away one or one and push away many forms; as long as wherein arbitrary fluorescent tube or a plurality of fluorescent tube are short-circuited or when opening circuit, this many fluorescent tubes back lighting device all can detect the power supply that obtains and close this many fluorescent tubes back lighting device in real time with this many fluorescent tubes back lighting device of protection.By this, can improve the shortcoming of the many fluorescent tubes back lighting device that adopts tapped protective circuit traditionally according to many fluorescent tubes back lighting device of the present utility model, so that more perfect circuit protection function to be provided.
Can be further understood by following utility model detailed description and accompanying drawing about advantage of the present utility model and spirit.
Description of drawings
Fig. 1 shows the schematic diagram according to many fluorescent tubes back lighting device of first specific embodiment of the present utility model.
Fig. 2 A shows the schematic diagram according to many fluorescent tubes back lighting device of second specific embodiment of the present utility model.
Fig. 2 B shows the schematic diagram of the transformer shown in Fig. 2 A when reality winds the line.
Fig. 3 shows the schematic diagram according to many fluorescent tubes back lighting device of the 3rd specific embodiment of the present utility model.
Fig. 4 shows the schematic diagram according to many fluorescent tubes back lighting device of the 4th specific embodiment of the present utility model.
The reference numeral explanation
1,4: two fluorescent tube back lighting devices 2,5: four fluorescent tube back lighting devices
11,21,41,51: the first fluorescent tubes 12,22,42,52: the second fluorescent tubes
23,53: the three fluorescent tubes 10,20,40,50: power supply
24,54: the four fluorescent tubes 13,25,43,55: transformer
45: sensing module 14,26,57: the first sensing modules
15,27,59: the second sensing modules 16,30,46,60: control module
133,433: ancillary coil 253,553: the first ancillary coils
17,31,47,61: full-bridge/half-bridge circuit 254,554: the second ancillary coils
2523,5523: the three subcoils 2524,5524: the four subcoils
131,251,431,28: the three sensing modules of 551: the first lateral coils
132,252,432,29: the four sensing modules of 552: the second lateral coils
256: the second magnetic cores of 255: the first magnetic cores
1321,2521,4321,5521: the first subcoils
1322,2522,4322,5522: the second subcoils
257: drum stand
Embodiment
The utility model provides a kind of many fluorescent tubes back lighting device that improves circuit protection function that has.According to first specific embodiment of the present utility model is a kind of pair of fluorescent tube back lighting device.Please refer to Fig. 1, Fig. 1 shows the schematic diagram of this pair fluorescent tube back lighting device.As shown in Figure 1, two fluorescent tube back lighting devices 1 comprise power supply 10, first fluorescent tube 11, second fluorescent tube 12, transformer 13, first sensing module 14, second sensing module 15, control module 16 and full-bridge/half-bridge circuit 17.As shown in Figure 1, transformer 13 is corresponding to a balancing transformer of first fluorescent tube 11 and second fluorescent tube 12, so two fluorescent tube back lighting device 1 belongs to a many fluorescent tubes back lighting device that pushes away two forms.In actual applications, the also available U type fluorescent tube of first fluorescent tube 11 and second fluorescent tube 12 replaces.Next, each element that is comprised at two fluorescent tube back lighting devices 1 respectively and the function that possesses thereof are inquired into.
At first, the transformer 13 at two fluorescent tube back lighting devices 1 is introduced.As shown in Figure 1, transformer 13 comprises first lateral coil (main coil) 131, second lateral coil (inferior coil) 132 and ancillary coil 133.Wherein first lateral coil 131 is coupled to power supply 10 by full-bridge/half-bridge circuit 17.In actual applications, when power supply 10 produced an input current, this input current will be through first lateral coil 131 of full-bridge/half-bridge circuit 17 inflow transformers 13.Then, second lateral coil 132 will produce an induced current according to this input current.This induced current will flow into first fluorescent tube 11 and second fluorescent tube 12 respectively to drive first fluorescent tube 11 and second fluorescent tube 12 makes it luminous.
In this embodiment, second lateral coil 132 comprises first subcoil 1321 and second subcoil 1322 that is coupled to each other, and wherein first subcoil 1321 also is coupled to first fluorescent tube 11 and second subcoil 1322 is coupled to second fluorescent tube 12.In fact, ancillary coil 133 is an induction coil, and its main function is by first subcoil 1321 of responding to second lateral coil (inferior coil) 132 and second subcoil 1322 to produce an induced voltage.
In this embodiment, first sensing module 14 is coupled between first subcoil 1321 and second subcoil 1322, produces first sensing signal in order to the sensing first voltage V1 and according to the first voltage V1; Second sensing module 15 is coupled to ancillary coil 133, produces second sensing signal in order to the sensing second voltage V2 and according to the second voltage V2.
Be coupled to power supply 10, first sensing module 14 and second sensing module 15 as for 16 of control modules.When control module 16 when first sensing module 14 and second sensing module 15 receive first sensing signal or second sensing signal, control module 16 will be according to first sensing signal or second sensing signal powered-down 10 optionally.Next, put up with that detailed operating mechanism is introduced between first sensing module 14, second sensing module 15 and the control module 16.
At first, elder generation is introduced with regard to the actual operation situation of first sensing module 14.In this embodiment, because first sensing module 14 is coupled to the low-pressure end of first subcoil 1321 and the low-pressure end of second subcoil 1322, and first subcoil 1321 of second lateral coil 132 is opposite with the phase place of the voltage of second subcoil 1322, therefore, when two fluorescent tube back lighting device 1 normal operation, the first voltage V1 that first sensing module 14 is sensed will be through the voltage after having repealed by implication.That is to say that under normal circumstances, the first voltage V1 that first sensing module 14 is sensed should be considerably little even levels off to zero.
Yet when unusual (for example first fluorescent tube, 11 short circuits) take place for first fluorescent tube 11 or second fluorescent tube 12, the voltage of the low-pressure end of first subcoil 1321 will not exist, so can't offset each other with the voltage of the low-pressure end of second subcoil 1322.Therefore, the first voltage V1 that this moment, first sensing module 14 was sensed will calibration reason condition get off highly.
In this embodiment, when first sensing module 14 sensed the first voltage V1, first sensing module 14 will judge that whether the difference DELTA V1 of the first voltage V1 and a default value Vr1 is greater than threshold value Δ Vt1.In fact, this default value Vr1 can be when two fluorescent tube back lighting device 1 normal operation, the reference voltage level that first sensing module 14 is sensed.In actual applications, suppose that on behalf of first sensing module 14, Δ Vt1 is set as zero, then judge whether the first voltage V1 is higher than default value Vr1.Next, putting up with first sensing module, 14 issuable two kinds of judged results inquires into.
If the judged result of first sensing module 14 is that Δ V1 is greater than Δ Vt1, represent the one of first fluorescent tube 11 and second fluorescent tube 12 may take place unusually, for example first fluorescent tube 11 is short-circuited or opens circuit, or second fluorescent tube, the 12 careless phenomenons that come off from a lighting tube connector.Therefore, with this understanding, when control module 16 when first sensing module 14 receives first sensing signal, control module 16 immediately powered-down 10 to protect two fluorescent tube back lighting devices 1.
On the other hand, if the judged result of first sensing module 14 be Δ V1 less than Δ Vt1, then may be one of following two kinds of situations: first kind of situation be the situation that first fluorescent tube 11 and second fluorescent tube 12 all are in normal operation; Second kind of situation then is the situation that first fluorescent tube 11 and second fluorescent tube 12 open circuit simultaneously.Suppose that first fluorescent tube 11 and second fluorescent tube 12 open circuit simultaneously; the first voltage V1 that first sensing module 14 is sensed may be suitable with default value Vr; then Δ V1 just may be less than threshold value Δ Vt1; therefore; when control module 16 when first sensing module 14 receives first sensing signal; control module 16 can't powered-down 10, thereby the situation that causes judging by accident takes place, and has lost defencive function originally.
Then, the actual operation situation of putting up with second sensing module 15 is introduced.In this embodiment, two fluorescent tube back lighting devices 1 comprise the ancillary coil 133 and second sensing module 15 that is coupled to each other, and its purpose promptly is to wish and can takes place with the situation of avoiding above-mentioned erroneous judgement by the help of the ancillary coil 133 and second sensing module 15.
In fact, first subcoil 1321 of ancillary coil 133 induction second lateral coils (inferior coil) 132 and second subcoil 1322 are with the generation induced voltage, and the second voltage V2 that second sensing module 15 is sensed is this induced voltage.When second sensing module 15 senses the second voltage V2, the difference DELTA V2 that second sensing module 15 will be judged the second voltage V2 and default value Vr2 whether greater than threshold value Δ Vt2 to produce second sensing signal.In actual applications, suppose that on behalf of second sensing module 15, Δ Vt2 is set as zero, then judge whether the second voltage V2 is higher than default value Vr2.Next, will inquire at 15 issuable two kinds of judged results of second sensing module.
If on behalf of two fluorescent tube back lighting devices 1, the difference DELTA V2 of the second voltage V2 and default value Vr2 less than threshold value Δ Vt2, be under the situation of normal operation.At this moment, the induced voltage that ancillary coil 133 is sensed is approximately close with default value Vr2, so second sensing module 15 is also approximately close with default value Vr2 from the second voltage V2 that ancillary coil 133 is sensed.In fact, the second voltage V2 that this moment, second sensing module 15 was sensed can be used for being used as default value Vr2.
On the other hand, if the difference DELTA V2 of the second voltage V2 and default value Vr2 is greater than threshold value Δ Vt2, represent the induced voltage of ancillary coil 133 to uprise, that is represent that first subcoil 1321 of second lateral coil (inferior coil) 132 and/or second subcoil 1322 may be under the non-loaded state, the situation that for example situation that opens circuit of first fluorescent tube 11 or second fluorescent tube 12, or first fluorescent tube 11 and second fluorescent tube 12 open circuit simultaneously.At this moment, when control module 16 when second sensing module 15 receives second sensing signal, control module 16 will be according to the second sensing signal powered-down 10 to protect two fluorescent tube back lighting devices 1.
In sum; in two fluorescent tube back lighting devices 1 of this embodiment; no matter be that first fluorescent tube 11 or second fluorescent tube 12 are short-circuited or open circuit; or first fluorescent tube 11 and second fluorescent tube 12 are short-circuited simultaneously or open circuit, and two fluorescent tube back lighting devices 1 all can detect the also real-time powered-down 10 of these unusual situations to reach the effect of the two fluorescent tube back lighting devices 1 of protection by first sensing module 14 or second sensing module 15.
According to second specific embodiment of the present utility model is a kind of four fluorescent tube back lighting devices.Please refer to Fig. 2 A, Fig. 2 A shows the schematic diagram of this four fluorescent tubes back lighting device.Shown in Fig. 2 A, four fluorescent tube back lighting devices 2 comprise power supply 20, first fluorescent tube 21, second fluorescent tube 22, the 3rd fluorescent tube 23, the 4th fluorescent tube 24, transformer 25, first sensing module 26, second sensing module 27, the 3rd sensing module 28, the 4th sensing module 29, control module 30 and full-bridge/half-bridge circuit 31.By Fig. 2 A as can be known, four fluorescent tube back lighting devices 2 belong to a many fluorescent tubes back lighting device that pushes away four forms.In fact, first fluorescent tube 21 and second fluorescent tube 22 can be replaced by a U type fluorescent tube, and the 3rd fluorescent tube 23 and the 4th fluorescent tube 24 are also together.
At first, the transformer 25 of putting up with four fluorescent tube back lighting devices 2 is introduced.In this embodiment, transformer 25 comprises first lateral coil 251, second lateral coil 252, first ancillary coil 253 and second ancillary coil 254.Wherein first lateral coil 251 is coupled to power supply 20.
Shown in Fig. 2 A, second lateral coil 252 comprises first subcoil 2521, second subcoil 2522, the 3rd subcoil 2523 and the 4th subcoil 2524, and wherein first subcoil 2521 is coupled to first fluorescent tube 21; Second subcoil 2522 is coupled to second fluorescent tube 22 and first subcoil 2521; The 3rd subcoil 2523 is coupled to the 3rd fluorescent tube 23; The 4th subcoil 2524 is coupled to the 4th fluorescent tube 24 and the 3rd subcoil 2523.
Next, please refer to Fig. 2 B, Fig. 2 B shows the schematic diagram of transformer 25 when reality winds the line among Fig. 2 A.Shown in Fig. 2 B, first magnetic core 255 and second magnetic core 256 are the magnetic core of E font, and first magnetic core 255 and second magnetic core 256 are arranged with the relative mode shown in Fig. 2 B, and then setting is thereon for drum stand 257.By Fig. 2 B as can be known, be positioned at drum stand 257 Centromedian coils and be first lateral coil 251 (main coil), first subcoil 2521, second subcoil 2522, the 3rd subcoil 2523 and the 4th subcoil 2524 of second lateral coil 252 (inferior coil) on drum stand 257 around the position then lay respectively at the left and right sides of first lateral coil 251.
As for first ancillary coil 253 and second ancillary coil 254, because first ancillary coil 253 is corresponding to first subcoil 2521 and second subcoil 2522, thus first ancillary coil 253 on the drum stand 257 around the position between first subcoil 2521 and second subcoil 2522; In like manner because second ancillary coil 254 is corresponding to the 3rd subcoil 2523 and the 4th subcoil 2524, so second ancillary coil 254 on the drum stand 257 around the position between the 3rd subcoil 2523 and the 4th subcoil 2524.
Then, putting up with each sensing module that four fluorescent tube back lighting devices 2 are comprised is introduced.Shown in Fig. 2 A, first sensing module 26 is coupled between first subcoil 2521 and second subcoil 2522; Second sensing module 27 is coupled to first ancillary coil 253; The 3rd sensing module 28 is coupled between the 3rd subcoil 2523 and the 4th subcoil 2524; The 4th sensing module 29 is coupled to second ancillary coil 254.
In this embodiment, first sensing module 26 produces first sensing signal in order to the sensing first voltage V1 and according to the first voltage V1; Second sensing module 27 produces second sensing signal in order to the sensing second voltage V2 and according to the second voltage V2; The 3rd sensing module 28 produces the 3rd sensing signal in order to sensing tertiary voltage V3 and according to tertiary voltage V3; The 4th sensing module 29 produces the 4th sensing signal in order to sensing the 4th voltage V4 and according to the 4th voltage V4.
Next, the control module 30 of putting up with four fluorescent tube back lighting devices 2 is introduced.Shown in Fig. 2 A, control module 30 is coupled to power supply 20, first sensing module 26, second sensing module 27, the 3rd sensing module 28 and the 4th sensing module 29.In this embodiment, the function of control module 30 is according to from the first received sensing signal of each sensing module, second sensing signal, the 3rd sensing signal or the 4th sensing signal powered-down 20 optionally.
In actual applications, because first sensing module 26 is coupled to the low-pressure end of first subcoil 2521 and the low-pressure end of second subcoil 2522, and first subcoil 2521 is opposite with the phase place of the voltage of second subcoil 2522, therefore, when 2 normal operations of four fluorescent tube back lighting devices, first sensing module 26 is sensed will be the first voltage V1 after having repealed by implication, so the time the first voltage V1 should be considerably little even level off to zero.
Yet when unusual (for example first fluorescent tube, 21 short circuits) took place for first fluorescent tube 21 or second fluorescent tube 22, the voltage of the low-pressure end of first subcoil 2521 did not exist, so can't offset each other with the voltage of the low-pressure end of second subcoil 2522.At this moment, the first voltage V1 that sensed of first sensing module 26 will more above-mentioned normal condition come highly.
When first sensing module 26 sensed the first voltage V1, first sensing module 26 will judge that whether the difference DELTA V1 of the first voltage V1 and a default value Vr1 is greater than threshold value Δ Vt1.In fact, this default value Vr1 can be when 2 normal operations of four fluorescent tube back lighting devices, the reference voltage level that first sensing module 26 is sensed.Next, will inquire into regard to first sensing module, 26 issuable two kinds of judged results respectively.
If the judged result of first sensing module 26 is that Δ V1 is greater than threshold value Δ Vt1, represent the one of first fluorescent tube 21 and second fluorescent tube 22 may take place unusually, for example second fluorescent tube 22 opens circuit or short circuit, or first fluorescent tube 21 is from the phenomenon of four fluorescent tube back lighting devices, 2 disengagings.Therefore, with this understanding, when control module 30 when first sensing module 26 receives first sensing signal, control module 30 will powered-down 20 to reach the effect of protection four fluorescent tube back lighting devices 2.
On the other hand, if the judged result of first sensing module 26 be Δ V1 less than threshold value Δ Vt1, then may be one of following two kinds of situations: first kind of situation be that first fluorescent tube 21 and second fluorescent tube 22 are all kept normal operation; Second kind of situation then is that first fluorescent tube 21 and second fluorescent tube 22 open circuit simultaneously.Because when first fluorescent tube 21 and second fluorescent tube 22 open circuit simultaneously; the first voltage V1 that first sensing module 26 is sensed may be suitable with default value Vr; that is Δ V1 may be less than threshold value Δ Vt1; so the time control module 30 can't powered-down 20; thereby cause the situation judged by accident to take place, lost the function of protecting four fluorescent tube back lighting devices 2 originally.
Therefore, for the situation that can avoid above-mentioned erroneous judgement takes place, in this embodiment, four fluorescent tube back lighting devices 2 have comprised second sensing module 27 that is coupled to first ancillary coil 253.In fact, first subcoil 2521 of first ancillary coil, 253 induction second lateral coils (inferior coil) 252 and second subcoil 2522 are with the generation induced voltage, and the second voltage V2 that second sensing module 27 is sensed is this induced voltage.When second sensing module 27 senses the second voltage V2, the difference DELTA V2 that second sensing module 27 will be judged the second voltage V2 and default value Vr2 whether greater than threshold value Δ Vt2 to produce second sensing signal.Next, will inquire at 27 issuable two kinds of judged results of second sensing module.
If the judged result of second sensing module 27 be Δ V2 less than Δ Vt2, represent four fluorescent tube back lighting devices 2 to be under the situation of normal operation.At this moment, the induced voltage that ancillary coil 253 is sensed is approximately close with default value Vr2, so second sensing module 27 is also approximately close with default value Vr2 from the second voltage V2 that ancillary coil 253 is sensed.In fact, the second voltage V2 that this moment, second sensing module 27 was sensed can be used for being used as default value Vr2.
On the other hand, if the judged result of second sensing module 27 is that Δ V2 is greater than Δ Vt2, represent the induced voltage of ancillary coil 253 to uprise, that is represent that first subcoil 2521 of second lateral coil (inferior coil) 252 and/or second subcoil 2522 may be under the non-loaded state, the situation that for example situation that opens circuit of first fluorescent tube 21 (or second fluorescent tube 22), or first fluorescent tube 21 and second fluorescent tube 22 open circuit simultaneously.At this moment, when control module 30 when second sensing module 27 receives second sensing signal, control module 30 will be according to the second sensing signal powered-down 20 to protect four fluorescent tube back lighting devices 2.
As for the 3rd sensing module 28 that is coupled between the 3rd subcoil 2523 and the 4th subcoil 2524, its actual operation situation is then similar to first sensing module 26.When the 3rd sensing module 28 senses tertiary voltage V3, the difference DELTA V3 that the 3rd sensing module 28 will be judged tertiary voltage V3 and default value Vr3 whether greater than threshold value Δ Vt3 to produce the 3rd sensing signal.In this embodiment, having only judged result when the 3rd sensing module 28 is Δ V3 during greater than Δ Vt3, control module 30 just can powered-down 20 to protect four fluorescent tube back lighting devices 2.
In addition, about being coupled to the 4th sensing module 29 of second ancillary coil 254, its actual operation situation is similar to second sensing module 27.When the 4th sensing module 29 senses the 4th voltage V4, the difference DELTA V4 that the 4th sensing module 29 is judged the 4th voltage V4 and default value Vr4 whether greater than threshold value Δ Vt4 to produce the 4th sensing signal.In this embodiment, having only judged result when the 4th sensing module 29 is Δ V4 during greater than Δ Vt4, control module 30 just can powered-down 20 to protect four fluorescent tube back lighting devices 2.
In sum; push away in the four fluorescent tube back lighting devices 2 of four forms at one of this embodiment; in case its fluorescent tube has abnormal conditions to take place; no matter be that arbitrary fluorescent tube (for example the 3rd fluorescent tube 23) is short-circuited or opens circuit; or first fluorescent tube 21 and second fluorescent tube 22 (or the 3rd fluorescent tube 23 and the 4th fluorescent tube 24) are short-circuited simultaneously or open circuit, and four fluorescent tube back lighting devices 2 all can detect the also real-time powered-down 20 of these abnormal conditions to protect four fluorescent tube back lighting devices 2 by each sensing module.
According to the 3rd specific embodiment of the present utility model is a kind of pair of fluorescent tube back lighting device.Please refer to Fig. 3, Fig. 3 shows the schematic diagram of this pair fluorescent tube back lighting device.As shown in Figure 3, two fluorescent tube back lighting devices 4 comprise power supply 40, first fluorescent tube 41, second fluorescent tube 42, transformer 43, sensing module 45, control module 46 and full-bridge/half-bridge circuit 47.As shown in Figure 3, two fluorescent tube back lighting devices 4 belong to a many fluorescent tubes back lighting device that pushes away two forms.In actual applications, the also available U type fluorescent tube of first fluorescent tube 41 and second fluorescent tube 42 replaces.
As shown in Figure 3, transformer 43 comprises first lateral coil (main coil) 431, second lateral coil (inferior coil) 432 and ancillary coil 433.Wherein first lateral coil 431 is coupled to power supply 40 by full-bridge/half-bridge circuit 47.Second lateral coil 432 comprises first subcoil 4321 and second subcoil 4322 that is coupled to each other, and wherein first subcoil 4321 is coupled to first fluorescent tube 41 and second subcoil 4322 is coupled to second fluorescent tube 42.In fact, ancillary coil 433 in order to first subcoil 4321 of responding to second lateral coil 432 and second subcoil 4322 to produce induced voltage.
In this embodiment, sensing module 45 is coupled to ancillary coil 433, and produces sensing signal in order to sensing voltage V and according to voltage V.In fact, when sensing module 45 senses voltage V, the difference DELTA V that sensing module 45 is judged voltage V and default value Vr whether greater than threshold value Δ Vt to produce sensing signal.If the judged result of sensing module 45 is that Δ V is greater than Δ Vt, represent the induced voltage of ancillary coil 433 to uprise, that is represent that first subcoil 4321 of second lateral coil 432 and/or second subcoil 4322 may be under the non-loaded state, for example first fluorescent tube 41 (or second fluorescent tube 42) opens circuit, or the situation that opens circuit simultaneously of first fluorescent tube 41 and second fluorescent tube 42.At this moment, control module 46 will the self-inductance measurement module 45 receive sensing signals and according to sensing signal powered-down 40 to protect two fluorescent tube back lighting devices 4.。
According to the 4th specific embodiment of the present utility model is a kind of four fluorescent tube back lighting devices.Please refer to Fig. 4, Fig. 4 shows the schematic diagram of this four fluorescent tubes back lighting device.As shown in Figure 4, four fluorescent tube back lighting devices 5 comprise power supply 50, first fluorescent tube 51, second fluorescent tube 52, the 3rd fluorescent tube 53, the 4th fluorescent tube 54, transformer 55, first sensing module 57, second sensing module 59, control module 60 and full-bridge/half-bridge circuit 61.As shown in Figure 4, four fluorescent tube back lighting devices 5 belong to a many fluorescent tubes back lighting device that pushes away four forms.In fact, first fluorescent tube 51 and second fluorescent tube 52 can be replaced by a U type fluorescent tube, and the 3rd fluorescent tube 53 and the 4th fluorescent tube 54 are also together.
In this embodiment, transformer 55 comprises first lateral coil 551, second lateral coil 552, first ancillary coil 553 and second ancillary coil 554.Wherein first lateral coil 551 is coupled to power supply 50.Shown in Fig. 2 A, second lateral coil 552 comprises first subcoil 5521, second subcoil 5522, the 3rd subcoil 5523 and the 4th subcoil 5524, and wherein first subcoil 5521 is coupled to first fluorescent tube 51; Second subcoil 5522 is coupled to second fluorescent tube 52 and first subcoil 5521; The 3rd subcoil 5523 is coupled to the 3rd fluorescent tube 53; The 4th subcoil 5524 is coupled to the 4th fluorescent tube 54 and the 3rd subcoil 5523.
In this embodiment, first sensing module 57 is coupled to first ancillary coil 553, and produces first sensing signal in order to the sensing first voltage V1 and according to the first voltage V1.In fact, when first sensing module 57 senses the first voltage V1, the difference DELTA V1 that first sensing module 57 will be judged the first voltage V1 and default value Vr1 whether greater than threshold value Δ Vt1 to produce sensing signal.If the judged result of first sensing module 57 is that Δ V1 is greater than Δ Vt1, represent first subcoil 5521 and/or second subcoil 5522 of second lateral coil 552 may be under the non-loaded state, for example first fluorescent tube 51 (or second fluorescent tube 52) opens circuit, or the situation that opens circuit simultaneously of first fluorescent tube 51 and second fluorescent tube 52.
Similarly, second sensing module 59 is coupled to second ancillary coil 554, and produces second sensing signal in order to the sensing second voltage V2 and according to the second voltage V2.In fact, when second sensing module 59 senses the second voltage V2, the difference DELTA V2 that second sensing module 59 will be judged the second voltage V2 and default value Vr2 whether greater than threshold value Δ Vt2 to produce sensing signal.If the judged result of second sensing module 59 is that Δ V2 is greater than Δ Vt2, represent the 3rd subcoil 5523 and/or the 4th subcoil 5524 of second lateral coil 552 may be under the non-loaded state, for example the 3rd fluorescent tube 53 (or the 4th fluorescent tube 54) opens circuit, or the situation that opens circuit simultaneously of the 3rd fluorescent tube 53 and the 4th fluorescent tube 54.
Be coupled to power supply 50, first sensing module 57 and second sensing module as for 60 of control modules and be coupled to power supply 50, first sensing module 57 and second sensing module 59 as for 60 of control modules.Control module 60 is in order to according to from received first sensing signal of each sensing module or second sensing signal powered-down 50 optionally.In fact, to have only judged result when first sensing module 57 be Δ V greater than the judged result of the Δ Vt or second sensing module 59 is Δ V2 during greater than Δ Vt2, control module 60 just can powered-down 50 to protect four fluorescent tube back lighting devices 5.
According to the 5th specific embodiment of the present utility model is a kind of pair of fluorescent tube back lighting device.Two fluorescent tube back lighting devices of this embodiment and two fluorescent tube back lighting devices of above-mentioned the 3rd specific embodiment are quite similar, do not repeat them here.Yet, Zui Da difference is between the two: the sensing module of the two fluorescent tube back lighting devices in the 3rd specific embodiment is coupled to ancillary coil, the sensing module of the two fluorescent tube back lighting devices among this embodiment then is to be coupled between first subcoil and second subcoil of second lateral coil, and produces sensing signal in order to sensing voltage V and according to voltage V.That is to say that the position of both sensing module sensing voltages is also inequality.Then, control module will be according to sensing signal powered-down optionally.
In this embodiment, when sensing module senses voltage V, the difference DELTA V that sensing module is judged voltage V and default value Vr whether greater than threshold value Δ Vt to produce sensing signal.In addition, first fluorescent tube and second fluorescent tube also can replace with U type fluorescent tube.
According to the 6th specific embodiment of the present utility model is a kind of four fluorescent tube back lighting devices.The four fluorescent tube back lighting devices of this embodiment and four fluorescent tube back lighting devices of above-mentioned the 4th specific embodiment are quite similar, do not repeat them here.Yet, Zui Da difference is between the two: first sensing module of four fluorescent tube back lighting devices in the 4th specific embodiment is coupled to first ancillary coil and second sensing module is coupled to second ancillary coil, and first sensing module of four fluorescent tube back lighting devices among this embodiment then is coupled between first subcoil of second lateral coil and second subcoil and second sensing module is coupled between the 3rd subcoil and the 4th subcoil of second lateral coil.That is to say that the position of both first sensing modules and the second sensing module sensing voltage is also inequality.
In this embodiment, first sensing module produces first sensing signal in order to the sensing first voltage V1 and according to the first voltage V1; Second sensing module then produces second sensing signal in order to the sensing second voltage V2 and according to the second voltage V2.Then, control module will be according to first sensing signal or second sensing signal powered-down optionally.
In fact, when first sensing module senses the first voltage V1, the difference DELTA V1 that first sensing module will be judged the first voltage V1 and default value Vr1 whether greater than threshold value Δ Vt1 to produce first sensing signal; When second sensing module senses the second voltage V2, the difference DELTA V2 that second sensing module is judged the second voltage V2 and default value Vr2 whether greater than threshold value Δ Vt2 to produce second sensing signal.In addition, in this embodiment, first fluorescent tube and second fluorescent tube can replace with U type fluorescent tube, and the 3rd fluorescent tube and the 4th fluorescent tube are also together.
Compared to prior art; can provide according to many fluorescent tubes back lighting device of the present utility model and to improve circuit protection function; no matter this many fluorescent tubes back lighting device belongs to one and pushes away one or one and push away many forms; as long as wherein arbitrary fluorescent tube or a plurality of fluorescent tube are short-circuited or when opening circuit, this many fluorescent tubes back lighting device all can detect and close the power supply of this many fluorescent tubes back lighting device in real time with this many fluorescent tubes back lighting device of protection.By this, can improve the shortcoming of the many fluorescent tubes back lighting device that adopts tapped protective circuit traditionally according to many fluorescent tubes back lighting device of the present utility model, so that more perfect circuit protection function to be provided.
By the above detailed description of preferred embodiments, hope can be known description feature of the present utility model and spirit more, and is not to come category of the present utility model is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category that is arranged in claim of the present utility model of various changes and tool equality.Therefore, the category of the claim that the utility model is applied for should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (27)
1. fluorescent tube back lighting device more than a kind is characterized in that, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply;
One second lateral coil comprises one first subcoil and one second subcoil, and wherein this first subcoil is coupled to this first fluorescent tube, and this second subcoil is coupled to this second fluorescent tube and this first subcoil; And
One ancillary coil;
One first sensing module is coupled between this first subcoil and this second subcoil, produces one first sensing signal in order to sensing one first voltage and according to this first voltage;
One second sensing module is coupled to this ancillary coil, produces one second sensing signal in order to sensing one second voltage and according to this second voltage; And
One control module is coupled to this power supply, this first sensing module and this second sensing module, and this control module is optionally closed this power supply according to this first sensing signal or this second sensing signal.
2. many fluorescent tubes back lighting device as claimed in claim 1, it is characterized in that, wherein when this first sensing module senses this first voltage, the difference that this first sensing module is judged this first voltage and a default value whether greater than a threshold value to produce this first sensing signal.
3. many fluorescent tubes back lighting device as claimed in claim 1, it is characterized in that, wherein when this second sensing module senses this second voltage, the difference that this second sensing module is judged this second voltage and a default value whether greater than a threshold value to produce this second sensing signal.
4. many fluorescent tubes back lighting device as claimed in claim 1 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
5. fluorescent tube back lighting device more than a kind is characterized in that, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One the 3rd fluorescent tube;
One the 4th fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply;
One second lateral coil, comprise one first subcoil, one second subcoil, one the 3rd subcoil and one the 4th subcoil, wherein this first subcoil is coupled to this first fluorescent tube, this second subcoil is coupled to this second fluorescent tube and this first subcoil, the 3rd subcoil is coupled to the 3rd fluorescent tube, and the 4th subcoil is coupled to the 4th fluorescent tube and the 3rd subcoil;
One first ancillary coil; And
One second ancillary coil;
One first sensing module is coupled between this first subcoil and this second subcoil, produces one first sensing signal in order to sensing one first voltage and according to this first voltage;
One second sensing module is coupled to this first ancillary coil, produces one second sensing signal in order to sensing one second voltage and according to this second voltage;
One the 3rd sensing module is coupled between the 3rd subcoil and the 4th subcoil, produces one the 3rd sensing signal in order to sensing one tertiary voltage and according to this tertiary voltage;
One the 4th sensing module is coupled to this second ancillary coil, produces one the 4th sensing signal in order to sensing 1 the 4th voltage and according to the 4th voltage; And
One control module is coupled to this power supply, this first sensing module, this second sensing module, the 3rd sensing module and the 4th sensing module, and this control module is optionally closed this power supply according to this first sensing signal, this second sensing signal, the 3rd sensing signal or the 4th sensing signal.
6. many fluorescent tubes back lighting device as claimed in claim 5, it is characterized in that, wherein when this first sensing module senses this first voltage, the difference that this first sensing module is judged this first voltage and a default value whether greater than a threshold value to produce this first sensing signal.
7. many fluorescent tubes back lighting device as claimed in claim 5, it is characterized in that, wherein when this second sensing module senses this second voltage, the difference that this second sensing module is judged this second voltage and a default value whether greater than a threshold value to produce this second sensing signal.
8. many fluorescent tubes back lighting device as claimed in claim 5, it is characterized in that, wherein when the 3rd sensing module senses this tertiary voltage, the difference that the 3rd sensing module is judged this tertiary voltage and a default value whether greater than a threshold value to produce the 3rd sensing signal.
9. many fluorescent tubes back lighting device as claimed in claim 5, it is characterized in that, wherein when the 4th sensing module senses the 4th voltage, the difference that the 4th sensing module is judged the 4th voltage and a default value whether greater than a threshold value to produce the 4th sensing signal.
10. many fluorescent tubes back lighting device as claimed in claim 5 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
11. many fluorescent tubes back lighting device as claimed in claim 5 is characterized in that, wherein the 3rd fluorescent tube and the 4th fluorescent tube can replace with a U type fluorescent tube.
12. the fluorescent tube back lighting device is characterized in that more than one kind, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply;
One second lateral coil comprises one first subcoil and one second subcoil, and wherein this first subcoil is coupled to this first fluorescent tube, and this second subcoil is coupled to this second fluorescent tube and this first subcoil; And
One ancillary coil;
One sensing module is coupled to this ancillary coil, produces a sensing signal in order to sensing one voltage and according to this voltage; And
One control module is coupled to this sensing module, and this control module receives this sensing signal and optionally closes this power supply according to this sensing signal.
13. many fluorescent tubes back lighting device as claimed in claim 12 is characterized in that, wherein when this sensing module senses this voltage, the difference that this sensing module is judged this voltage and a default value whether greater than a threshold value to produce this sensing signal.
14. many fluorescent tubes back lighting device as claimed in claim 12 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
15. the fluorescent tube back lighting device is characterized in that more than one kind, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One the 3rd fluorescent tube;
One the 4th fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply;
One second lateral coil, comprise one first subcoil, one second subcoil, one the 3rd subcoil and one the 4th subcoil, wherein this first subcoil is coupled to this first fluorescent tube, this second subcoil is coupled to this second fluorescent tube and this first subcoil, the 3rd subcoil is coupled to the 3rd fluorescent tube, and the 4th subcoil is coupled to the 4th fluorescent tube and the 3rd subcoil;
One first ancillary coil; And
One second ancillary coil;
One first sensing module is coupled to this first ancillary coil, produces one first sensing signal in order to sensing one first voltage and according to this first voltage;
One second sensing module is coupled to this second ancillary coil, produces one second sensing signal in order to sensing one second voltage and according to this second voltage; And
One control module is coupled to this power supply, this first sensing module and this second sensing module, and this control module is optionally closed this power supply according to this first sensing signal or this second sensing signal.
16. many fluorescent tubes back lighting device as claimed in claim 15, it is characterized in that, wherein when this first sensing module senses this first voltage, the difference that this first sensing module is judged this first voltage and a default value whether greater than a threshold value to produce this first sensing signal.
17. many fluorescent tubes back lighting device as claimed in claim 15, it is characterized in that, wherein when this second sensing module senses this second voltage, the difference that this second sensing module is judged this second voltage and a default value whether greater than a threshold value to produce this second sensing signal.
18. back lighting device as claimed in claim 15 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
19. back lighting device as claimed in claim 15 is characterized in that, wherein the 3rd fluorescent tube and the 4th fluorescent tube can replace with a U type fluorescent tube.
20. the fluorescent tube back lighting device is characterized in that more than one kind, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply; And
One second lateral coil comprises one first subcoil and one second subcoil, and wherein this first subcoil is coupled to this first fluorescent tube, and this second subcoil is coupled to this second fluorescent tube and this first subcoil;
One sensing module is coupled between this first subcoil and this second subcoil, produces a sensing signal in order to sensing one voltage and according to this voltage; And
One control module is coupled to this sensing module, and this control module receives this sensing signal and optionally closes this power supply according to this sensing signal.
21. many fluorescent tubes back lighting device as claimed in claim 20 is characterized in that, wherein when this sensing module senses this voltage, the difference that this sensing module is judged this voltage and a default value whether greater than a threshold value to produce this sensing signal.
22. many fluorescent tubes back lighting device as claimed in claim 20 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
23. the fluorescent tube back lighting device is characterized in that more than one kind, comprises:
One power supply;
One first fluorescent tube;
One second fluorescent tube;
One the 3rd fluorescent tube;
One the 4th fluorescent tube;
One transformer comprises:
One first lateral coil is coupled to this power supply;
One second lateral coil, comprise one first subcoil, one second subcoil, one the 3rd subcoil and one the 4th subcoil, wherein this first subcoil is coupled to this first fluorescent tube, this second subcoil is coupled to this second fluorescent tube and this first subcoil, the 3rd subcoil is coupled to the 3rd fluorescent tube, and the 4th subcoil is coupled to the 4th fluorescent tube and the 3rd subcoil;
One first ancillary coil; And
One second ancillary coil;
One first sensing module is coupled between this first subcoil and this second subcoil, produces one first sensing signal in order to sensing one first voltage and according to this first voltage;
One second sensing module is coupled between the 3rd subcoil and the 4th subcoil, produces one second sensing signal in order to sensing one second voltage and according to this second voltage; And
One control module is coupled to this power supply, this first sensing module and this second sensing module, and this control module is optionally closed this power supply according to this first sensing signal or this second sensing signal.
24. many fluorescent tubes back lighting device as claimed in claim 23, it is characterized in that, wherein when this first sensing module senses this first voltage, the difference that this first sensing module is judged this first voltage and a default value whether greater than a threshold value to produce this first sensing signal.
25. many fluorescent tubes back lighting device as claimed in claim 23, it is characterized in that, wherein when this second sensing module senses this second voltage, the difference that this second sensing module is judged this second voltage and a default value whether greater than a threshold value to produce this second sensing signal.
26. back lighting device as claimed in claim 23 is characterized in that, wherein this first fluorescent tube and this second fluorescent tube can replace with a U type fluorescent tube.
27. back lighting device as claimed in claim 23 is characterized in that, wherein the 3rd fluorescent tube and the 4th fluorescent tube can replace with a U type fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201259352U CN201263238Y (en) | 2008-07-22 | 2008-07-22 | Multi-lamp tube backlight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201259352U CN201263238Y (en) | 2008-07-22 | 2008-07-22 | Multi-lamp tube backlight device |
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| Publication Number | Publication Date |
|---|---|
| CN201263238Y true CN201263238Y (en) | 2009-06-24 |
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| CNU2008201259352U Expired - Fee Related CN201263238Y (en) | 2008-07-22 | 2008-07-22 | Multi-lamp tube backlight device |
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| CN (1) | CN201263238Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9801258B2 (en) | 2014-03-19 | 2017-10-24 | Philips Lighting Holding B.V. | Multi-modal sensing |
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2008
- 2008-07-22 CN CNU2008201259352U patent/CN201263238Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9801258B2 (en) | 2014-03-19 | 2017-10-24 | Philips Lighting Holding B.V. | Multi-modal sensing |
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Granted publication date: 20090624 Termination date: 20120722 |