CN202713490U - Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television - Google Patents
Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television Download PDFInfo
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- CN202713490U CN202713490U CN 201220352283 CN201220352283U CN202713490U CN 202713490 U CN202713490 U CN 202713490U CN 201220352283 CN201220352283 CN 201220352283 CN 201220352283 U CN201220352283 U CN 201220352283U CN 202713490 U CN202713490 U CN 202713490U
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Abstract
The utility model discloses a short-circuit protective circuit at the power supply end of a liquid crystal display television control chip, which at least comprises a PFC (Power Factor Correction) conversion circuit control chip, a short-circuit protective circuit and an LLC (Logic Link Control) resonance circuit switch circuit, wherein the PFC conversion circuit control chip is used for detecting a PFC output voltage and outputting a high level to the LLC resonance circuit switch circuit according to the detection result; the short-circuit protective circuit is used for inducing the short-circuit state at a high-level end and cutting off the current of the LLC resonance circuit switch circuit, so that the LLC resonance circuit switch circuit is closed; and the LLC resonance circuit switch circuit is used for receiving the high level output by the PFC conversion circuit control chip and opening an LLC resonance circuit, so that the LLC resonance circuit works. According to the utility model, a fault short-circuit end is connected with a control end in the power supply design, so that opening of a triode is avoided, and further, devices are prevented from damage, in this way, short-circuit protection is carried out; in the event of carrying out short-circuit protection, the triode has completely no current flow thereon, which therefore guarantees that circuit devices can be prevented from burnout to the most extent.
Description
Technical field
The utility model relates to a kind of LCD TV, relates in particular to a kind of LCD TV control chip feeder ear short-circuit protection circuit and LCD TV.
Background technology
In the Power Management Design of large-screen liquid crystal display television, introduce power factor correction (PFC) translation circuit with the non-sinusoidal current of the serious distortion avoiding causing because of rectification circuit, can improve power factor on the one hand, the output loading end obtains more power.On the other hand, avoid harmonic current that electrical network is worked the mischief.Adopt LLC resonant transformation technology, the former limit of LLC converter device metal-oxide-semiconductor no-voltage (ZVS) is open-minded, and output diode ZCS turn-offs, and does not have reverse-recovery problems, and switching loss is little.Therefore also be fit to be applied to high frequency, high power density design.
In the course of the work, whether under-voltage locking pin (RDY) by PFC translation circuit control chip detects the PFC output voltage greater than 89% of predetermined value, and then controls power supply pin (VCC) voltage of the control chip of LLC resonant circuit by the output high-low level.
But power supply pin (VCC) shorted to earth when the control chip of LLC resonant circuit can burn out triode, cause the LLC resonant circuit can't start operation, the power panel fault, even get rid of VCC_LLC shorted to earth phenomenon of the failure, power panel also can't work.
The solution that exists at present still still might be burnt out triode because large electric current flow through for a long time for the electric current in the short-circuit loop limits, and causes the power panel fault.Therefore the current limliting scheme can not thoroughly solve the short-circuit protection problem.
The utility model content
For the problems referred to above; the purpose of this utility model is to provide a kind of LCD TV control chip feeder ear short-circuit protection circuit, and the failed shorted end is linked to each other with control end, has avoided the open-minded of triode or metal-oxide-semiconductor; avoid causing device failure, accomplished short-circuit protection.
For achieving the above object, a kind of LCD TV control chip feeder ear short-circuit protection circuit described in the utility model comprises PFC translation circuit control chip, short-circuit protection circuit and LLC resonant circuit switching circuit, wherein at least;
PFC translation circuit control chip detects the size of PFC output voltage, and according to testing result control output high level to LLC resonant circuit switching circuit;
Short-circuit protection circuit, the short-circuit condition of induction high level end, and LLC resonant circuit switching circuit carried out current chopping, it is closed;
LLC resonant circuit switching circuit receives the high level that PFC translation circuit control chip is exported, and opens the LLC resonant circuit, makes its work.
Preferably, described short-circuit protection circuit comprises three divider resistances and a triode at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first triode; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first triode, and ground connection; The emitter of the first triode is connected on the LLC resonant circuit switching circuit.
Preferably, described LLC resonant circuit switching circuit comprises a triode at least, and this triode is the second triode, wherein;
The base stage of the second triode is connected with the emitter of the first triode, and the collector of the second triode is connected with the high level end, and the emitter of the second triode is connected with feeder ear.
Preferably, described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second triode, and the other end is connected with feeder ear.
Preferably, described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first triode, and the other end is connected with the base stage of the second triode.
Preferably, described short-circuit protection circuit comprises three divider resistances and a metal-oxide-semiconductor at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first metal-oxide-semiconductor; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first metal-oxide-semiconductor, and ground connection; The emitter of the first metal-oxide-semiconductor is connected on the LLC resonant circuit switching circuit.
Preferably, described LLC resonant circuit switching circuit comprises a metal-oxide-semiconductor at least, and this metal-oxide-semiconductor is the second metal-oxide-semiconductor, wherein;
The base stage of the second metal-oxide-semiconductor is connected with the emitter of the first metal-oxide-semiconductor, and the collector of the second metal-oxide-semiconductor is connected with the high level end, and the emitter of the second metal-oxide-semiconductor is connected with feeder ear.
Preferably, described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second metal-oxide-semiconductor, and the other end is connected with feeder ear.
Preferably, described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first metal-oxide-semiconductor, and the other end is connected with the base stage of the second metal-oxide-semiconductor.
A kind of LCD TV; at least comprise control chip feeder ear short-circuit protection circuit, LLC resonant circuit and power panel; it is characterized in that, described control chip feeder ear short-circuit protection circuit is the described LCD TV control chip of arbitrary claim feeder ear short-circuit protection circuit among the claims 1-9.
The beneficial effects of the utility model are:
The utility model links to each other the failed shorted end in Power Management Design with control end, avoided the open-minded of triode, thereby avoids causing device failure, carries out thus short-circuit protection.When short-circuit protection, there is not current flowing on the triode fully, therefore can guarantee to greatest extent that circuit devcie can not burn out.The utility model can recover normal work after short trouble is discharged.
Description of drawings
Fig. 1 is the not schematic diagram of short-circuit protection of prior art;
Fig. 2 is the described LCD TV control chip of the utility model embodiment feeder ear short-circuit protection circuit schematic diagram.
Embodiment
Below in conjunction with Figure of description the utility model is further described.
Be the not schematic diagram of short-circuit protection of prior art such as Fig. 1, at work, if short circuit phenomenon occurs, can cause the damage of internal part.
When normal operation, pfc circuit output voltage V CC_PFC reach scheduled voltage 89% the time, PFC control chip under-voltage locking (RDY) pin will be set to high level.At this moment, reach the cut-in voltage Vth of triode V102, the V102 conducting exports high level VCC_LCC for the power supply pin (VCC) of the control chip of LLC resonant circuit, and the LLC resonant circuit is started working.
But when the VCC_LCC shorted to earth, PFC control chip under-voltage locking (RDY) pin still is high level, and triode V102 base voltage is still greater than cut-in voltage Vth, and V102 is conducting still.This moment, collector and emitter two ends pressure reduction was large, and impedance is little, forms large electric current, can make rapidly heating and damaging of V102.
Even the fault of VCC_LCC shorted to earth is got rid of, also because damaging, V102 can't export VCC-LLC voltage, so can't start the LLC resonant circuit, final not output also is that power panel can't work.
In order to solve above-mentioned short circuit problem, the described a kind of LCD TV control chip feeder ear short-circuit protection circuit of the utility model embodiment comprises PFC translation circuit control chip, short-circuit protection circuit and LLC resonant circuit switching circuit, wherein at least;
PFC translation circuit control chip detects the size of PFC output voltage, and according to testing result control output high level to LLC resonant circuit switching circuit;
Short-circuit protection circuit, the short-circuit condition of induction high level end, and LLC resonant circuit switching circuit carried out current chopping, it is closed;
LLC resonant circuit switching circuit receives the high level that PFC translation circuit control chip is exported, and opens the LLC resonant circuit, makes its work.
The below describes short-circuit protection circuit with specific embodiment:
As shown in Figure 2, described short-circuit protection circuit comprises three divider resistances and a triode at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first triode; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first triode, and ground connection; The emitter of the first triode is connected on the LLC resonant circuit switching circuit.
Described LLC resonant circuit switching circuit comprises a triode at least, and this triode is the second triode, wherein;
The base stage of the second triode is connected with the emitter of the first triode, and the collector of the second triode is connected with the high level end, and the emitter of the second triode is connected with feeder ear.
Described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second triode, and the other end is connected with feeder ear.
Described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first triode, and the other end is connected with the base stage of the second triode.
Short-circuit protection process of the present utility model is:
This circuit normal operation can be divided into start working moment and two states of stable state.
When circuit is started working moment, without VCC_LCC voltage, this moment the pfc circuit output voltage be increased to predetermined value 89% the time, PFC control chip RDY pin is high level, its electric current is about 2mA, by the suitable resistance of R202 is set, 10K Ω for example then will reach the cut-in voltage Vth of triode V202, the V202 conducting, the collector electrode of V202 had electric current and flow through this moment, by the suitable resistance of R204 is set, obtained the base voltage of V201, can satisfy the base voltage of V201 fully less than emitter voltage, thereby reach the cut-in voltage Vth of V201, V201 is open-minded, output high level VCC_LCC.
When entering steady operation, voltage VCC_LCC is through larger resistance R 201, R202, R203 dividing potential drop, so electric current is very little, also is that the V202 base current is very little, and V202 and V201 are in conducting state, output high level VCC_LCC, the normal operation of LLC resonant circuit.
It is a key point that VCC_LCC links to each other with the RDY pin through larger resistance, therefore when the VCC_LCC shorted to earth, triode V202 base voltage is pulled low to 0, be lower than the turning-on voltage Vth of V202, V202 turn-offs, and then its collector electrode no current also is that the base stage no current of triode V201 flows through, V201 is in cut-off state can conducting, can not burn out therefore there is electric current not flow through.This moment, the LLC resonant circuit was not worked no-output.
After the fault of VCC_LCC shorted to earth was got rid of, circuit can recover again normal operation.
In addition, triode can be changed to metal-oxide-semiconductor, can be effective equally.
Described short-circuit protection circuit comprises three divider resistances and a metal-oxide-semiconductor at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first metal-oxide-semiconductor; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first metal-oxide-semiconductor, and ground connection; The emitter of the first metal-oxide-semiconductor is connected on the LLC resonant circuit switching circuit.
Described LLC resonant circuit switching circuit comprises a metal-oxide-semiconductor at least, and this metal-oxide-semiconductor is the second metal-oxide-semiconductor, wherein;
The base stage of the second metal-oxide-semiconductor is connected with the emitter of the first metal-oxide-semiconductor, and the collector of the second metal-oxide-semiconductor is connected with the high level end, and the emitter of the second metal-oxide-semiconductor is connected with feeder ear.
Described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second metal-oxide-semiconductor, and the other end is connected with feeder ear.
Described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first metal-oxide-semiconductor, and the other end is connected with the base stage of the second metal-oxide-semiconductor.
Short-circuit protection process of the present utility model is:
This circuit normal operation can be divided into start working moment and two states of stable state.
When circuit is started working moment, without VCC_LCC voltage, this moment the pfc circuit output voltage be increased to predetermined value 89% the time, PFC control chip RDY pin is high level, its electric current is about 2mA, by the suitable resistance of R202 is set, 10K Ω for example then will reach the cut-in voltage Vth of metal-oxide-semiconductor V202, the V202 conducting, the collector electrode of V202 had electric current and flow through this moment, by the suitable resistance of R204 is set, obtained the base voltage of V201, can satisfy the base voltage of V201 fully less than emitter voltage, thereby reach the cut-in voltage Vth of V201, V201 is open-minded, output high level VCC_LCC.
When entering steady operation, voltage VCC_LCC is through larger resistance R 201, R202, R203 dividing potential drop, so electric current is very little, also is that the V202 base current is very little, and V202 and V201 are in conducting state, output high level VCC_LCC, the normal operation of LLC resonant circuit.
It is a key point that VCC_LCC links to each other with the RDY pin through larger resistance, therefore when the VCC_LCC shorted to earth, metal-oxide-semiconductor V202 base voltage is pulled low to 0, be lower than the turning-on voltage Vth of V202, V202 turn-offs, and then its collector electrode no current also is that the base stage no current of metal-oxide-semiconductor V201 flows through, V201 is in cut-off state can conducting, can not burn out therefore there is electric current not flow through.This moment, the LLC resonant circuit was not worked no-output.
After the fault of VCC_LCC shorted to earth was got rid of, circuit can recover again normal operation.
A kind of LCD TV; at least comprise control chip feeder ear short-circuit protection circuit, LLC resonant circuit and power panel; it is characterized in that, described control chip feeder ear short-circuit protection circuit is the described LCD TV control chip of arbitrary claim feeder ear short-circuit protection circuit among the claims 1-9.
Above; it only is preferred embodiment of the present utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claim was defined.
Claims (10)
1. a LCD TV control chip feeder ear short-circuit protection circuit is characterized in that, comprises at least PFC translation circuit control chip, short-circuit protection circuit and LLC resonant circuit switching circuit, wherein;
PFC translation circuit control chip detects the size of PFC output voltage, and according to testing result control output high level to LLC resonant circuit switching circuit;
Short-circuit protection circuit, the short-circuit condition of induction high level end, and LLC resonant circuit switching circuit carried out current chopping, it is closed;
LLC resonant circuit switching circuit receives the high level that PFC translation circuit control chip is exported, and opens the LLC resonant circuit, makes its work.
2. LCD TV control chip feeder ear short-circuit protection circuit according to claim 1 is characterized in that, described short-circuit protection circuit comprises three divider resistances and a triode at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first triode; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first triode, and ground connection; The emitter of the first triode is connected on the LLC resonant circuit switching circuit.
3. LCD TV control chip feeder ear short-circuit protection circuit according to claim 2 is characterized in that, described LLC resonant circuit switching circuit comprises a triode at least, and this triode is the second triode, wherein;
The base stage of the second triode is connected with the emitter of the first triode, and the collector of the second triode is connected with the high level end, and the emitter of the second triode is connected with feeder ear.
4. LCD TV control chip feeder ear short-circuit protection circuit according to claim 3; it is characterized in that; described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second triode, and the other end is connected with feeder ear.
5. LCD TV control chip feeder ear short-circuit protection circuit according to claim 2; it is characterized in that; described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first triode, and the other end is connected with the base stage of the second triode.
6. LCD TV control chip feeder ear short-circuit protection circuit according to claim 1 is characterized in that, described short-circuit protection circuit comprises three divider resistances and a metal-oxide-semiconductor at least, wherein;
Described high level end is connected with the first divider resistance, and is connected on the RDY pin of described PFC translation circuit control chip; The input of described the second divider resistance is connected to the input of the first divider resistance, and the output of the second divider resistance is connected on the base stage of the first metal-oxide-semiconductor; The input of the 3rd divider resistance is connected to the output of the second divider resistance, and the output of the 3rd divider resistance is connected on the collector of the first metal-oxide-semiconductor, and ground connection; The emitter of the first metal-oxide-semiconductor is connected on the LLC resonant circuit switching circuit.
7. LCD TV control chip feeder ear short-circuit protection circuit according to claim 6 is characterized in that, described LLC resonant circuit switching circuit comprises a metal-oxide-semiconductor at least, and this metal-oxide-semiconductor is the second metal-oxide-semiconductor, wherein;
The base stage of the second metal-oxide-semiconductor is connected with the emitter of the first metal-oxide-semiconductor, and the collector of the second metal-oxide-semiconductor is connected with the high level end, and the emitter of the second metal-oxide-semiconductor is connected with feeder ear.
8. LCD TV control chip feeder ear short-circuit protection circuit according to claim 7; it is characterized in that; described LLC resonant circuit switching circuit also comprises the 4th divider resistance, and an end of described the 4th divider resistance is connected with the emitter of the second metal-oxide-semiconductor, and the other end is connected with feeder ear.
9. LCD TV control chip feeder ear short-circuit protection circuit according to claim 6; it is characterized in that; described short-circuit protection circuit also comprises the 5th divider resistance, and an end of described the 5th divider resistance is connected with the emitter of the first metal-oxide-semiconductor, and the other end is connected with the base stage of the second metal-oxide-semiconductor.
10. LCD TV; at least comprise control chip feeder ear short-circuit protection circuit, LLC resonant circuit and power panel; it is characterized in that, described control chip feeder ear short-circuit protection circuit is the described LCD TV control chip of arbitrary claim feeder ear short-circuit protection circuit among the claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352283 CN202713490U (en) | 2012-07-19 | 2012-07-19 | Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352283 CN202713490U (en) | 2012-07-19 | 2012-07-19 | Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television |
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| Publication Number | Publication Date |
|---|---|
| CN202713490U true CN202713490U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220352283 Expired - Lifetime CN202713490U (en) | 2012-07-19 | 2012-07-19 | Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television |
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| CN (1) | CN202713490U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701337A (en) * | 2014-01-16 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Power supply system |
| US10026372B2 (en) | 2014-08-15 | 2018-07-17 | Boe Technology Group Co., Ltd. | Alternating current-direct current converter, power supply board and display apparatus |
-
2012
- 2012-07-19 CN CN 201220352283 patent/CN202713490U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701337A (en) * | 2014-01-16 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Power supply system |
| CN103701337B (en) * | 2014-01-16 | 2016-04-13 | 青岛歌尔声学科技有限公司 | A kind of power-supply system |
| US10026372B2 (en) | 2014-08-15 | 2018-07-17 | Boe Technology Group Co., Ltd. | Alternating current-direct current converter, power supply board and display apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266555 no.218, qianwangang Road, Qingdao Economic and Technological Development Zone, Shandong Province Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
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| CX01 | Expiry of patent term |