CN105633936A - Surge protection circuit and backlight drive circuit - Google Patents
Surge protection circuit and backlight drive circuit Download PDFInfo
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- CN105633936A CN105633936A CN201610069161.5A CN201610069161A CN105633936A CN 105633936 A CN105633936 A CN 105633936A CN 201610069161 A CN201610069161 A CN 201610069161A CN 105633936 A CN105633936 A CN 105633936A
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- diode
- transformator
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- signal output
- surge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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Abstract
The invention provides a surge protection circuit and a backlight drive circuit, which are connected with a signal output circuit and a transformer, wherein the surge protection circuit comprises a first diode; an anode of the first diode is connected with a first signal output end of the signal output circuit and a first input end of the transformer respectively; a cathode of the first diode is connected with a second input end of the transformer; the first input end of the transformer, the first diode and the second input end of the transformer form a discharge loop; and a surge voltage at the first input end of the transformer can be discharged through the discharge loop, so that the signal output circuit can be effectively and reliably protected.
Description
Technical field
The present invention relates to circuit engineering, particularly relate to a kind of surge protection circuit and backlight drive circuit.
Background technology
Along with developing rapidly of science and technology, the audio-visual equipment for life & amusement also constantly updates, and therefore, people are also just more and more higher to the requirement of the safety and reliability of electronic equipment.
In conventional electronic devices, signal output apparatus can directly be connected with transformator, when electronic device works is in thunder and lightning district occurred frequently, when thunderbolt occurs, the surge voltage produced can act on transformator, thus flowing to the signal output apparatus being directly connected to transformator, signal output apparatus is damaged, thus causing that electronic equipment is destroyed.
In prior art; personal experience printed circuit board (PrintedCircuitBoard in the electronic device would generally be relied on; referred to as: PCB) configuration of typesetting and cabling are arranged enterprising line pipe control; the path of restriction thunderbolt or momentary surges voltage, realizes the function of protection electronic equipment.
But, adopt said method cannot realize the destruction effectively avoiding surge voltage that electronic equipment is caused.
Summary of the invention
The embodiment of the present invention provides a kind of surge protection circuit and backlight drive circuit, with the problem overcoming the destruction that cannot effectively avoid surge voltage that electronic equipment is caused in prior art.
Embodiment of the present invention first aspect provides a kind of surge protection circuit, connects signal output apparatus and transformator, and described surge protection circuit includes: the first diode; The anode of described first diode is connected with the first signal output part of described signal output apparatus and the first input end of described transformator respectively, and the negative electrode of described first diode is connected with the second input of described transformator.
The surge protection circuit provided in the present invention, connects signal output apparatus and transformator, and this surge protection circuit includes: the first diode; Wherein, the anode of the first diode is connected with the first signal output part of signal output apparatus and the first input end of transformator respectively; the negative electrode of the first diode is connected with the second input of transformator; wherein; second input of the first input end of transformator, the first diode and transformator constitutes bleed-off circuit; make to occur the surge voltage at the first input end of transformator can be released by this bleed-off circuit; thus protecting signal output apparatus effectively, reliably, and then effectively protect electronic equipment.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 show the Circuits System schematic diagram in traditional TV;
The Circuits System that Fig. 2 show in traditional TV realize schematic diagram;
Fig. 3 show the structural representation of novel Circuits System provided by the invention;
Fig. 4 show the structural representation one of the surge protection circuit that the embodiment of the present invention provides;
Fig. 5 show the structural representation two of the surge protection circuit that the embodiment of the present invention provides;
Fig. 6 show the structural representation three of the surge protection circuit that the embodiment of the present invention provides;
Fig. 7 show the structural representation four of the surge protection circuit that the embodiment of the present invention provides;
Fig. 8 show the structural representation five of the surge protection circuit that the embodiment of the present invention provides;
Fig. 9 show the structural representation six of the surge protection circuit that the embodiment of the present invention provides;
Figure 10 show the embodiment of the present invention provide TV in Circuits System realize schematic diagram.
Detailed description of the invention
Along with the competition in fierce market makes the reliability of tv product, safety increasingly by the attention of all big enterprises, how improving the reliability of electronic product, safety is also the direction that each large manufacturer makes great efforts development.
Along with the developing of overseas market, the especially market of some thunder and lightning districts occurred frequently, intrinsic rate occurred frequently thunderbolt characteristic, the reliability of product, safety are constituted certain threat. Need the circuit in existing electronic equipment is improved, with the requirement of satisfied thunderbolt.
The present invention, for electronic equipment for TV, illustrates, it is notable that present disclosure can be applied to any electronic equipment, is not limited with TV.
Fig. 1 show the Circuits System schematic diagram in traditional TV, as shown in Figure 1, the Circuits System of traditional TV includes control chip, driving transformer, prime power circuit, isolating transformer, voltage follower circuit and feedback circuit, wherein, control chip sends control signal, the control signal that control chip is sent by driving transformer is transferred to prime power circuit, the control signal received is carried out DC/DC conversion by prime power circuit and isolating transformer one piece, and then the output of the voltage after DC/DC conversion will be carried out to equipment needed thereby by voltage follower circuit, and feedback circuit therein is for providing negative feedback control signal for whole circuit.
In traditional Circuits System in TV, the unspecial circuit preventing surge voltage, personal experience can only be relied on to arrange enterprising line pipe control at the configuration of PCB typesetting and cabling, the path of restriction surge voltage, realize defencive function. But, owing to everyone experience is different, different circuits there are differences again, causes the ability difference to some extent of different Circuits System anti-surge voltage. Cannot realize controlling accurately the effect of surge voltage, and there is certain potential safety hazard.
It should be noted that; the surge voltage mentioned in the present invention refers to due to extraneous or internal cause; the moment too high voltages beyond normal working voltage produced in Circuits System; thought for the explanation present invention clearly; the embodiment of the present invention illustrates for the surge voltage produced of being struck by lightning; but in actual applications, the surge protection circuit in the present invention can stop the damage to circuit of surge voltage that any mode produces.
Concrete, what Fig. 2 showed the Circuits System of conventional electronic devices realizes schematic diagram, as in figure 2 it is shown, in traditional Circuits System, N1 is control chip, T1 is driving transformer, and V1, V2 are power MOS, T2, T3 is isolating transformer. When normal circuit operation, the N1 output drive signal in Fig. 2, to T1, amplifies, through T1, the power circuit that rear drive V1, V2, T2, T3 are constituted, and then exports required voltage via T2, T3. When thunderbolt produces surge voltage, this surge voltage can be added on N1 pin by T1, it is easy to causes that N1 damages.
For the problems referred to above; the invention provides a kind of novel Circuits System; Fig. 3 show the structural representation of novel Circuits System provided by the invention; as shown in Figure 3; in this novel circuit system; add a surge protection circuit; to arrange path of specifically releasing; when thunderbolt produces surge voltage; this surge protection circuit can guide surge voltage to walk according to specific bleed-off circuit; avoid protecting device (control chip etc.), thus promoting resistance surge voltage ability.
In Circuits System shown in Fig. 3, whole surge protection circuit periphery discrete component is little, also improves the reliability of whole circuit while improve resistance surge voltage ability.
With specifically embodiment, the technical scheme of the surge protection circuit in above-mentioned Fig. 3 is described in detail below. These specific embodiments can be combined with each other below, is likely to repeat no more in certain embodiments for same or analogous concept or process.
Fig. 4 show the structural representation one of the surge protection circuit that the embodiment of the present invention provides, and as shown in Figure 4, the surge protection circuit 13 of the present embodiment connects signal output apparatus 11 and transformator 12, and this surge protection circuit 13 may include that the first diode 131;
The anode of above-mentioned first diode 131 is connected with the first signal output part 111 of above-mentioned signal output apparatus 11 and the first input end 121 of above-mentioned transformator 12 respectively, and the negative electrode of above-mentioned first diode 131 is connected with the second input 122 of above-mentioned transformator 12.
By above-mentioned connected mode, it is possible to make first input end 121, first diode 131 of transformator 12 and the second input 122 of transformator 12 constitute bleed-off circuit.
When there is thunderbolt, assume that the surge voltage produced acts on the first input end 121 of transformator 12, surge voltage can be directly inputted into the first signal output part 111 of signal output apparatus 11 by the first input end 121 of transformator 12 in the prior art, so that the first signal output part 111 of signal output apparatus 11 damages. And in the present invention; surge voltage can be directly inputted into the anode of the first diode 131 by the first input end 121 of transformator 12; then the second input 122 to above-mentioned transformator 12 is inputted by the negative electrode of the first diode 131; this bleed-off circuit formed is short circuit the first signal output part 111 of signal output apparatus 11 effectively; make surge voltage can pass through this bleed-off circuit; thus avoiding surge voltage input to the first signal output part 111 of signal output apparatus 11, effectively protect signal output apparatus 11.
The surge protection circuit that the present embodiment provides, connects signal output apparatus and transformator, and this surge protection circuit includes: the first diode; Wherein, the anode of the first diode is connected with the first signal output part of signal output apparatus and the first input end of transformator respectively; the negative electrode of the first diode is connected with the second input of transformator; wherein; second input of the first input end of transformator, the first diode and transformator constitutes bleed-off circuit; make to occur the surge voltage at the first input end of transformator can be released by this bleed-off circuit, thus protecting signal output apparatus effectively, reliably.
Further; on the basis of surge protection circuit shown in Fig. 4; in order to further improve the reliability of surge protection circuit 13; as shown in Figure 5; above-mentioned surge protection circuit also includes: the second diode 132 and electric capacity 135; the negative electrode of above-mentioned first diode 131 is connected with the second input 122 of above-mentioned transformator 12, particularly as follows:
The negative electrode of above-mentioned first diode 131 is connected with the first end of above-mentioned electric capacity 135, and the second end of above-mentioned electric capacity 135 is connected with the anode of above-mentioned second diode 132, and the negative electrode of above-mentioned second diode 132 is connected with the second input 122 of above-mentioned transformator 12. Add the effect of electric capacity
By above-mentioned connected mode, it is possible to make first input end 121, first diode 131 of transformator 12, diode the 135, second diode 132, transformator 12 the second input 122 constitute loop.
When there is thunderbolt, it is assumed that the surge voltage of generation acts on the first input end 121 of transformator 12. the whole process released is: surge voltage is directly inputted into the anode of the first diode 131 by the first input end 121 of transformator 12, then the first end to electric capacity 135 is inputted by the negative electrode of the first diode 131, and then the anode of the second diode 132 is entered by the second end of electric capacity 135, last the second input 122 being inputted extremely above-mentioned transformator 12 by the negative electrode of the second diode 132, effective short circuit the first signal output part 111 of signal output apparatus 11 in this bleed-off circuit formed, make surge voltage can pass through this bleed-off circuit to be released, thus avoiding the surge voltage input the first signal output part 111 to signal output apparatus 11, effectively protect signal output apparatus 11.
By adding two diodes in surge protection circuit, even if after the first diode 131 damages, the second all right normal operation of diode 132, thus improve the reliability of whole surge protection circuit 13.
Further; on the basis of surge protection circuit shown in Fig. 5; in order to further improve the reliability of surge protection circuit 13; namely; in order to avoid the voltage of the signal of signal output apparatus 11 output can be released by surge protection circuit, as shown in Figure 6, above-mentioned signal output apparatus 11 also includes the voltage output end 113 providing clamp voltage for described surge protection circuit 13; now, the negative electrode of above-mentioned first diode 131 is also connected with voltage output end 113.
Such as: in the surge protection circuit shown in Fig. 6, the output voltage assuming the voltage output end 113 of signal output apparatus 11 is 12V, then clamp voltage is 12V, when whole Circuits System normal operation, the voltage of the signal of signal output apparatus 11 output is less than 12V, therefore when whole Circuits System normal operation, the voltage of the first diode 131 anode is lower than the voltage of the first diode 131 negative electrode, thus causing that the first diode 131 is in cut-off state, now the signal of the first signal output part 112 output of signal output apparatus 11 can be directly entered the first input end 121 of transformator, and the surge protection circuit that the signal of the first signal output part 112 output of signal output apparatus 11 will not pass through in the present invention is released, and when producing surge voltage, instantaneous high pressure generally it is due to surge voltage, namely it is above the voltage of voltage output end 113, now the voltage of the first diode 131 anode is higher than the voltage of the first diode 131 negative electrode, thus the first diode 131 turns on, namely the surge protection circuit that the surge voltage produced can be passed through in the present invention released.
Circuit as shown in Figure 6; when whole Circuits System normal operation; the voltage of voltage output end 113 output will not act on the first diode 131 and the 3rd diode 133 in the surge protection circuit in the present invention; simultaneously; owing to electric capacity 135 can play logical friendship every straight effect; so the voltage of voltage output end 113 output is without being applied to the 4th diode 134 and the second diode 132; and then the voltage of voltage output end 113 output will not be applied to transformator, thus the surge protection circuit in the present invention is without influence on the normal operation of whole Circuits System.
In actual applications; general signal output circuit 11 has two signal output parts; and transformator 12 has 2 inputs; it is thus desirable to two signal output parts of signal output apparatus 11 are all protected; now, on the basis of the protection circuit shown in Fig. 6, as shown in Figure 7; above-mentioned protection circuit also includes: the 3rd diode 133 and the 4th diode 134
The anode 133 of above-mentioned 3rd diode and the second input 122 of above-mentioned transformator 12 connect, and the negative electrode of above-mentioned 3rd diode 133 is connected with the first end of above-mentioned electric capacity 135 and above-mentioned voltage output end 113 respectively; Second end of above-mentioned electric capacity 135 is connected with the anode of above-mentioned 4th diode 134, and the above-mentioned negative electrode of the 4th diode 134 is connected with the first input end 121 of transformator 12; The secondary signal outfan 112 of above-mentioned signal output apparatus 11 is connected with the second input 122 of above-mentioned transformator 12.
By above-mentioned circuit, except make first input end 121, first diode 131 of transformator 12, electric capacity the 135, second diode 132, transformator 12 the second input 122 constitute bleed-off circuit except, it is also possible to make transformator 12 the second input the 122, the 3rd diode 133, between electric capacity the 135, the 4th diode 134 and the first input end 121 of transformator 12 constitute bleed-off circuit.
When there is thunderbolt, if the surge voltage produced acts on the first input end 121 of transformator 12, then implementation is identical with the mode of above-described embodiment, repeats no more herein.
If and the surge voltage produced acts on the second input 122 of transformator 12, surge voltage can be directly inputted into the anode of the 3rd diode 133 by the second input 122 of transformator 12, then the first end to electric capacity 135 is inputted by the negative electrode of the 3rd diode 133, and then by the anode of the second end output of electric capacity 135 to the 4th diode 134, the last first input end 121 being inputted extremely above-mentioned transformator 12 by the negative electrode of the 4th diode 134, this bleed-off circuit formed is the short circuit secondary signal outfan 112 of signal output apparatus 11 effectively, and surge voltage can be released by this bleed-off circuit, thus avoiding the surge voltage input secondary signal outfan 112 to signal output apparatus 11, effectively protect signal output apparatus 11.
In the present embodiment, it is possible to two signal output parts of signal output apparatus 11 are protected simultaneously, improves reliability.
Electric current in order to avoid flowing in diode involved in each embodiment above-mentioned is excessive; therefore current-limiting resistance also can be set; to reduce the electric current flowing into diode; on the basis of Fig. 7; as shown in Figure 8: above-mentioned surge protection circuit 13 can also include the first resistance 136, the anode of above-mentioned first diode 131 is connected with the first input end 121 of above-mentioned transformator 12 by above-mentioned first resistance 136.
Further, on the basis of Fig. 8, as it is shown in figure 9, above-mentioned surge protection circuit 13 can also include: the second resistance 137, the anode of above-mentioned 3rd diode 133 is connected with the second input 122 of above-mentioned transformator 12 by above-mentioned second resistance 137.
It should be noted that the signal output apparatus in Fig. 4 to Fig. 9 can be the control chip in Fig. 1 and Fig. 2. And the diode in Fig. 4 to Fig. 9 can also be the device that field effect transistor or audion etc. have unilateral conduction.
The embodiment of the present invention also provides for a kind of backlight drive circuit, including, power supply circuits and the luminescence component being connected with power supply circuits outfan, also including: signal output apparatus, transformator and surge protection circuit as above-mentioned in Fig. 4 to Fig. 8 any embodiment, above-mentioned signal output apparatus is connected with above-mentioned transformator by above-mentioned surge protection circuit; The other end of above-mentioned transformator is connected with the control end of above-mentioned power supply circuits.
Further, Figure 10 show the embodiment of the present invention provide TV in Circuits System realize schematic diagram, on the basis realizing schematic diagram of the Circuits System in the traditional TV shown in Fig. 2, add VD3, VD4, VD5, VD6 and R7, wherein VD3, VD4, VD5, VD6 constitute specific bleed-off circuit, guide the surge voltage that thunderbolt produces. R7 then can play the effect of current limliting, increases the reliability of circuit further. When there is thunderbolt; if the surge voltage produced is malleation, it is assumed that surge voltage can be begun through R7 through VD3 to C1 by 4 feet of T1, then arrives 1 foot of T1 via the negative terminal of C1 to VD6, C2; thus forming a loop, 7 feet of protection N1 will not be subject to the impact of high pressure and damage. If the surge voltage produced is negative pressure; assume surge voltage can by 1 foot of T1 C2 through VD4 to C1; then arrive 4 feet of T1 via the negative terminal of C1 to VD5, R7, thus forming a loop, 5 feet of protection N1 will not be subject to the impact of surge voltage and damage. In order to ensure the normal operation of circuit, the resistance of R7 now can be defined to 10 ohms.
In this circuit, N1 can use functionally similar any control chip to substitute. VD3, VD4, VD5, VD6 can use any type of diode or functionally similar device to substitute.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a surge protection circuit, connects signal output apparatus and transformator, it is characterised in that
Described surge protection circuit includes: the first diode;
The anode of described first diode is connected with the first signal output part of described signal output apparatus and the first input end of described transformator respectively, and the negative electrode of described first diode is connected with the second input of described transformator.
2. circuit according to claim 1, it is characterised in that described surge protection circuit also includes: the second diode and electric capacity,
The negative electrode of described first diode is connected with the second input of described transformator, particularly as follows:
The negative electrode of described first diode is connected with the first end of described electric capacity, and the second end of described electric capacity is connected with the anode of described second diode, and the negative electrode of described second diode is connected with the second input of described transformator.
3. circuit according to claim 2, it is characterised in that described signal output apparatus also includes the voltage output end providing clamp voltage for described surge protection circuit,
The negative electrode of described first diode is also connected with described voltage output end.
4. circuit according to claim 3, it is characterised in that described circuit also includes: the 3rd diode and the 4th diode,
The anode of described 3rd diode and the second input of described transformator connect, and the negative electrode of described 3rd diode is connected with the first end of described electric capacity and described voltage output end respectively;
Second end of described electric capacity is connected with the anode of described 4th diode, and the negative electrode of described 4th diode is connected with the first input end of transformator;
The secondary signal outfan of described signal output apparatus is connected with the second input of described transformator.
5. circuit according to claim 4, it is characterised in that described circuit also includes the first resistance,
The anode of described first diode is connected with the first input end of described transformator by described first resistance.
6. circuit according to claim 5, it is characterised in that described circuit also includes the second resistance,
The anode of described 3rd diode is connected with the second input of described transformator by described second resistance.
7. a backlight drive circuit, including, power supply circuits and the luminescence component being connected with power supply circuits outfan, it is characterised in that also include: signal output apparatus, transformator and the surge protection circuit as described in any one of claim 1-6,
Described signal output apparatus is connected with described transformator by described surge protection circuit;
The other end of described transformator is connected with the control end of described power supply circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610069161.5A CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610069161.5A CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
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| Publication Number | Publication Date |
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| CN105633936A true CN105633936A (en) | 2016-06-01 |
| CN105633936B CN105633936B (en) | 2018-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610069161.5A Expired - Fee Related CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099880A (en) * | 2016-07-21 | 2016-11-09 | 中国海洋石油总公司 | A kind of leadage circuit, release chip and NMR logging instrument |
| WO2018010183A1 (en) * | 2016-07-15 | 2018-01-18 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
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| CN2494575Y (en) * | 2001-01-22 | 2002-06-05 | 四川石油管理局川东钻探公司 | AC circuit clutter removing device for electric driller |
| US20050243496A1 (en) * | 2002-10-08 | 2005-11-03 | Fultec Pty. Ltd. | Protection devices and methods for preventing the flow of undesirable differential mode transients |
| CN101630838A (en) * | 2009-08-25 | 2010-01-20 | 杭州华三通信技术有限公司 | Difference mode surge protection circuit of net interface and realizing method thereof |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
| CN103050096A (en) * | 2013-01-21 | 2013-04-17 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2494575Y (en) * | 2001-01-22 | 2002-06-05 | 四川石油管理局川东钻探公司 | AC circuit clutter removing device for electric driller |
| US20050243496A1 (en) * | 2002-10-08 | 2005-11-03 | Fultec Pty. Ltd. | Protection devices and methods for preventing the flow of undesirable differential mode transients |
| CN101630838A (en) * | 2009-08-25 | 2010-01-20 | 杭州华三通信技术有限公司 | Difference mode surge protection circuit of net interface and realizing method thereof |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018010183A1 (en) * | 2016-07-15 | 2018-01-18 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
| CN106099880A (en) * | 2016-07-21 | 2016-11-09 | 中国海洋石油总公司 | A kind of leadage circuit, release chip and NMR logging instrument |
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| CN105633936B (en) | 2018-07-13 |
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