CN202008814U - Driving circuit and liquid crystal television - Google Patents
Driving circuit and liquid crystal television Download PDFInfo
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- CN202008814U CN202008814U CN2011201178817U CN201120117881U CN202008814U CN 202008814 U CN202008814 U CN 202008814U CN 2011201178817 U CN2011201178817 U CN 2011201178817U CN 201120117881 U CN201120117881 U CN 201120117881U CN 202008814 U CN202008814 U CN 202008814U
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Abstract
The utility model provides a driving circuit and a liquid crystal television, relating to the electronic technical field. The technical problem in the prior art that the higher cost of a finished product due to the use of more electronic components. The driving circuit comprises a voltage converting module, a current sampling module, a voltage sharing module and a control module, wherein the voltage converting module is used for obtaining current from an external power supply, converting the current into a working voltage which is suitable for a first power consuming module and a second power consuming module connecting in parallel mutually and then outputting the working voltage to the first power consuming module and the second power consuming module; the current sampling module is used for inducing the size of the current passing through the first power consuming module and the second power consuming module; the voltage sharing module is used for sharing the voltage on one of the first power consuming module and the second power consuming module, through which the bigger current passes; and the control module is used for controlling the voltage output by the voltage converting module according to the size of the current induced by the current sampling module. The crystal liquid television comprises the driving circuit disclosed by the utility model. The driving circuit is used for supplying power to the power consumption modules.
Description
Technical field
The utility model relates to electronic technology field, the liquid crystal TV set that is specifically related to a kind of driving circuit and is provided with this driving circuit.
Background technology
Along with the develop rapidly of electronic technology, the popularity rate of liquid crystal TV set is more and more higher, and driving circuit is the power supply that is used to its backlight power supply in the electronic equipments such as liquid crystal TV set, LCD computer.
As shown in Figure 1, backlight in the liquid crystal TV set is mainly LED lamp bar, existing liquid crystal TV set generally includes two LED lamp bars, driving circuit for the power supply of LED lamp bar, comprise two driving circuit branches, each driving circuit branches into the power supply of LED lamp bar, and each driving circuit branch includes boost booster circuit, diode, electric energy input end, LED chip for driving and sampling resistor, wherein:
The boost booster circuit, being used for from the external power source received current and with its rising is to input to diode after the operating voltage of a LED lamp bar;
Diode, being used for the alternating current rectification is the positive pole that exports LED lamp bar after the DC current from the electric energy input end to;
The LED chip for driving, be used for crossing the electric current of LED lamp bar by the sampling resistor acquisition stream, and control the boost booster circuit according to the size of the electric current of gathering and whether carry out voltage rising work, when the electric current that flows through LED lamp bar hour, then control the boost booster circuit and carry out boost operations, otherwise, when the electric current that flows through LED lamp bar is big, then controls the boost booster circuit and stop boost operations.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In the prior art, the liquid crystal TV set that is provided with two LED lamp bars for inside needs two driving circuit branches, each driving circuit branch is provided with and comprises boost booster circuit, diode, electric energy input end, LED chip for driving and sampling resistor, the use electronic devices and components are many, cause cost than higher.
The utility model content
The utility model embodiment provides a kind of driving circuit on the one hand, a kind of liquid crystal TV set that is provided with this driving circuit also is provided on the other hand, solved prior art exist to use electronic devices and components many, cause cost of products to compare technical problems of high.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
This driving circuit comprises voltage transformation module, current sample module, division module and control module, wherein:
Described voltage transformation module, be used for from external power source obtain electric current and be converted into first power consumption module that meets mutual parallel connection and the operating voltage of second power consumption module after, export described first power consumption module and described second power consumption module respectively to;
Described current sample module is used for the size of current that induced flow is crossed described first power consumption module and described second power consumption module;
Described division module, both flow through voltage on bigger one of the electric current to be used for sharing described first power consumption module and described second power consumption module;
Described control module is used for the size of current responded to according to described current sample module, controls the size of described voltage transformation module output voltage.
First power consumption module, second power consumption module of mutual parallel connection and the driving circuit that is provided for above-mentioned the utility model embodiment of described first power consumption module and the power supply of described second power consumption module are provided this liquid crystal TV set.
Compared with prior art, the utility model embodiment provides and can produce following at least technique effect in above-mentioned arbitrary technical scheme:
Because in the driving circuit that the utility model embodiment is provided, the current sample module can induced flow be crossed the size of current of first power consumption module and second power consumption module (for example two LED lamp bars), division module can be shared first power consumption module and second power consumption module and flow through voltage on bigger one of the electric current among both, and the size of current that control module can be responded to according to the current sample module, the size of control voltage transformation module output voltage, so when the current sample module is sensed when flowing through first power consumption module and both electric currents of second power consumption module all less than its required working current, control module can be controlled the bigger voltage of voltage transformation module output, when the voltage of voltage transformation module output increased, the electric current that flows through first power consumption module and second power consumption module must also can increase;
Simultaneously, when the current sample module is sensed first power consumption module and second power consumption module and an electric current that flows through is only arranged less than its required working current among both, when control module control voltage transformation module is exported bigger voltage, because can sharing first power consumption module and second power consumption module, division module flows through voltage on bigger one of the electric current among both, so first power consumption module and second power consumption module flow through voltage on bigger one of the electric current among both and can not increase or increase very little, so the electric current that first power consumption module and second power consumption module flow through among both on bigger one of the electric current yet can not increase or increase seldom, and first power consumption module and second power consumption module flow through electric current among both and go up voltage less than one of its required working current and can increase or increase obviously, and then first power consumption module and second power consumption module flow through electric current among both and also can increase or increase obviously less than the electric current on one of its required working current;
By above-mentioned analysis as can be seen: voltage transformation module is only exported one road voltage and can be guaranteed simultaneously that just first power consumption module and second power consumption module flow through the electric current that meets its working current value in the driving circuit that present embodiment provided, and then can guarantee first power consumption module and second power consumption module operate as normal simultaneously, and to guarantee that voltage transformation module only exports one road voltage and only need to use a control module and a voltage transformation module to realize, when first power consumption module and second power consumption module are two LED lamp bars, only use a driving circuit branch can realize driving to two LED lamp bars, compared with prior art, the driving circuit that present embodiment provided can be saved a control module (for example LED chip for driving) and a voltage transformation module (for example boost booster circuit) at least, and then a control module and the employed electronic devices and components of voltage transformation module have also been saved, so the electronic devices and components that use still less, simultaneously owing to can realize the cost of the electronic devices and components of division module function usually, cost far below a control module and the employed electronic devices and components of voltage transformation module, so the cost of products of the driving circuit that present embodiment provided also can be lower, exist the use electronic devices and components many so solved prior art, cause cost of products to compare technical problems of high;
In addition, because employed electronic devices and components of driving circuit that present embodiment provided are fewer, so also have ease of connection, advantage easy to maintenance.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is to be the inner structure synoptic diagram of the driving circuit of the LED lamp bar power supply in the liquid crystal TV set in the prior art;
The synoptic diagram of the annexation between a kind of embodiment of the driving circuit that Fig. 2 provides for the utility model embodiment and first power consumption module, second power consumption module;
The synoptic diagram of the annexation between the preferred implementation of the driving circuit that Fig. 3 is provided for the utility model embodiment and first power consumption module, second power consumption module.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not paying creative work belongs to the scope that the utility model is protected.
The utility model embodiment provides a kind of and has used that electronic devices and components are fewer, cost of products is lower, ease of connection, driving circuit and a kind of liquid crystal TV set that is provided with this driving circuit easy to maintenance.
As shown in Figures 2 and 3, the driving circuit that the utility model embodiment is provided comprises voltage transformation module 1, current sample module 2, division module 3 and control module 4, wherein:
Because in the driving circuit that the utility model embodiment is provided, current sample module 2 can induced flow be crossed the size of current of first power consumption module 11 and second power consumption module 12, division module 3 can be shared first power consumption module 11 and second power consumption module 12 and flow through voltage on bigger one of the electric current among both, and the size of current that control module 4 can be responded to according to current sample module 2, the size of control voltage transformation module 1 output voltage, so when current sample module 2 is sensed when flowing through first power consumption module 11 and both electric currents of second power consumption module 12 all less than its required working current, control module 4 can be controlled the bigger voltage of voltage transformation module 1 output, when the voltage of voltage transformation module 1 output increased, the electric current that flows through first power consumption module 11 and second power consumption module 12 must also can increase;
Simultaneously, when current sample module 2 is sensed first power consumption module 11 and second power consumption module 12 and an electric current that flows through is only arranged less than its required working current among both, when control module 4 control voltage transformation modules 1 are exported bigger voltage, because can sharing first power consumption module 11 and second power consumption module 12, division module 3 flows through voltage on bigger one of the electric current among both, so first power consumption module 11 and second power consumption module 12 flow through voltage on bigger one of the electric current among both and can not increase or increase very little, so the electric current that first power consumption module 11 and second power consumption module 12 flow through among both on bigger one of the electric current yet can not increase or increase seldom, and first power consumption module 11 and second power consumption module 12 flow through electric current among both and go up voltage less than one of its required working current and can increase or increase obviously, and then first power consumption module 11 and second power consumption module 12 flow through electric current among both and also can increase or increase obviously less than the electric current on one of its required working current;
By above-mentioned analysis as can be seen: voltage transformation module 1 is only exported one road voltage and can be guaranteed simultaneously that just first power consumption module 11 and second power consumption module 12 flow through the electric current that meets its working current value in the driving circuit that present embodiment provided, and then can guarantee first power consumption module 11 and second power consumption module 12 operate as normal simultaneously, and to guarantee that voltage transformation module 1 only exports one road voltage and only need to use a control module 4 and a voltage transformation module 1 to realize, when first power consumption module 11 and second power consumption module 12 are two LED lamp bars, only use a driving circuit branch can realize driving to two LED lamp bars, compared with prior art, the driving circuit that present embodiment provided can be saved a control module 4 (for example LED chip for driving) and a voltage transformation module 1 (for example boost booster circuit) at least, and then a control module 4 and voltage transformation module 1 employed electronic devices and components have also been saved, so the electronic devices and components that use still less, simultaneously owing to can realize the cost of the electronic devices and components of division module 3 functions usually, cost far below a control module 4 and voltage transformation module 1 employed electronic devices and components, so the cost of products of the driving circuit that present embodiment provided also can be lower, exist the use electronic devices and components many so solved prior art, cause cost of products to compare technical problems of high;
In addition, because employed electronic devices and components of driving circuit that present embodiment provided are fewer, so also have ease of connection, advantage easy to maintenance.
As shown in Figures 2 and 3, external power source 10 can be transformer T1 as shown in Figure 3 in the present embodiment, certainly, also can for other can output current generating, electric supply installation or electrical storage device.
First power consumption module 11 and second power consumption module 12 are LED lamp bar in the present embodiment;
And/or voltage transformation module 1 is the boost booster circuit;
And/or control module 4 is the LED chip for driving;
And/or the power consumption of first power consumption module 11 and second power consumption module 12 is identical.
LED lamp bar can be a LED lamp, also can or be in series for two LED lamps parallel connections.
The boost booster circuit can adopt the method for the dutycycle of its interior metal-oxide-semiconductor Q4 of control to control the height of the voltage of its output, when dutycycle is big, the voltage of boost booster circuit output raises, otherwise, when dutycycle is big, the voltage of boost booster circuit output reduces, and that the boost booster circuit has is simple in structure, control simple advantage.Certainly, also can use other circuit outside the boost booster circuit or electronic devices and components (for example transformer) etc. in the present embodiment.
The advantage that the LED chip for driving has stable performance, is convenient to connect.When control module 4 is the LED chip for driving, the driving circuit that utilizes the utility model embodiment to be provided is be provided existing driving circuit is transformed.Certainly, control module 4 also can be the chip with data-handling capacity outside the LED chip for driving in the present embodiment.
Because the difference of manufacture craft and design, first power consumption module 11 and both power consumptions of second power consumption module 12 can not be in full accord, so first power consumption module 11 and second power consumption module 12 must have an electric current that flows through at first less than its required working current among both, so only respond to first power consumption module 11 and second power consumption module 12 among both during at first less than its required working current, control module 4 can be the earliest the too low problem of discovery electric current, not only help improving the reaction velocity of driving circuit, and since feed back to control module 4 a current value only arranged, so 4 data volumes to be processed of control module are also fewer.
Amplifying unit 23 is used for the current value of less current amplified and is converted to input control module 4 behind the magnitude of voltage;
After amplifying unit 23 amplifies the less current value, because the current value ratio of the electric current after amplifying is bigger, so easier to be sensed.Common control chip all has the function of test voltage size, so when amplifying unit 23 will be converted to behind the magnitude of voltage input control module 4,4 chips that can select of control module wider.
After the electric current that flows through the electric current of first power consumption module 11 and flow through second power consumption module 12 is exaggerated, the current value that flows through first power consumption module 11 is bigger with the missionary society of the current value that flows through second power consumption module 12, being convenient to the current sample module 2 current value less current of sampling out is that sampling unit 21 is when sampling, the current value of being gathered can be bigger, like this, during contrast unit 22 contrast current values big or small, be difficult for makeing mistakes.
That resistance has is with low cost, connect simple advantage.When current flowing resistance, can share part voltage with first power consumption module 11, division module 3 on the resistance.
The 3rd resistance R 3 one ends link to each other with the first constant voltage input end Vcc1, and the other end of the 3rd resistance R 3 links to each other with the anode of the first diode VD1 and the anode of the second diode VD2 respectively;
The negative electrode of the first diode VD1 is connected between the current output terminal and first resistance R 1 of first power consumption module 11;
The negative electrode of the second diode VD2 is connected between the current output terminal and second resistance R 2 of second power consumption module 12;
And/or amplifying unit 23 comprises the 4th resistance R 4 of the first triode Q1 and ground connection, wherein:
The base stage of the first triode Q1 links to each other with the anode of the first constant voltage input end Vcc1, the first diode VD1 and the anode of the second diode VD2 respectively;
The emitter of the first triode Q1 links to each other with control module 4, the 4th resistance R 4 respectively;
The collector of the first triode Q1 is connected between the first constant voltage input end Vcc1 and the 3rd resistance R 3.
The first diode VD1 and the second diode VD2 form an OR circuit, the anode of the first diode VD1 and the second diode VD2 all links to each other with the first constant voltage input end Vcc1, so its anode voltage is consistent, when which voltage ratio in the negative electrode of the negative electrode of the first diode VD1 and the second diode VD2 is low, any bar circuit turn-on, for example: when the voltage of the negative electrode of the first diode VD1 is the voltage 1V of the 0.5V negative electrode that is lower than the second diode VD2, the first diode VD1 conducting.Because the voltage of the negative electrode of the first diode VD1 depends on the voltage on first resistance R 1, and the voltage on first resistance R 1 is directly proportional with the electric current that flows through on it, so the electric current that flows through first resistance R 1 hour, the voltage on first resistance R 1 is lower, the first diode VD1 conducting.Because the forward voltage drop of diode is a definite value (for example 0.2V) normally, during the first diode VD1 conducting, the anode voltage of the first diode VD1 is 0.7V, like this, the voltage of the anode by gathering the first diode VD1 and the second diode VD2, the electric current that just can collect the electric current that flows through first resistance R 1, first power consumption module 11 and flow through second resistance R 2, second power consumption module 12 current value less current among both.
The base stage of the base stage of the second triode Q2 and the 3rd triode Q3 links to each other with the second constant voltage input end Vcc2 respectively;
The collector of the second triode Q2 links to each other with the current output terminal of first power consumption module 11;
The collector of the 3rd triode Q3 links to each other with the current output terminal of second power consumption module 12;
The emitter of the second triode Q2 links to each other with the negative electrode of first resistance R 1, the first diode VD1 respectively;
The emitter of the second triode Q2 links to each other with the negative electrode of second resistance R 2, the second diode VD2 respectively.
When first power consumption module 11 and second power consumption module 12 are LED lamp bar, during the conducting of LED lamp bar, voltage on it is a constant value, so only need to control well the electric current that flows through first power consumption module 11 and second power consumption module 12, the working current that makes its electric current meet first power consumption module 11 and second power consumption module 12 gets final product.When the size of current that flows through first power consumption module 11 and second power consumption module 12 not simultaneously, the electric current of supposing to flow through first power consumption module 11 is little, at this moment, the first diode VD1, the first triode Q1 conducting successively, voltage on the 4th resistance R 4 increases, control module 4 just can improve the dutycycle of metal-oxide-semiconductor Q4 in the voltage transformation module 1, and then the mode of the dutycycle by improving metal-oxide-semiconductor Q4 is controlled the higher voltage of voltage transformation module 1 output voltage values and is given first power consumption module 11 and second power consumption module 12, at this moment, additional voltage can load on the second triode Q2 before inputing to second power consumption module, 12 ratios, can't load on second power consumption module 12, so flowing through the electric current of second power consumption module 12 still can not change, and only have the electric current that flows through on first power consumption module 11 to increase, when flowing through electric current on first power consumption module 11 and meet its working current, control module 4 just can not change the dutycycle of metal-oxide-semiconductor Q4 in the voltage transformation module 1 again, when the electric current that flows through first power consumption module 11 and electric current one of them among both of flowing through second power consumption module 12 were lower than its working current once more, control module 4 was controlled the output voltage of voltage transformation module 1 once more by the mode of adjusting the dutycycle of metal-oxide-semiconductor Q4 in the voltage transformation module 1.
A wherein end of inductance L links to each other with the positive pole of the first external voltage input end and first capacitor C 1 respectively;
The wherein other end of inductance L links to each other with the current input terminal of the drain electrode of metal-oxide-semiconductor Q4 and first power consumption module 11, the current input terminal of second power consumption module 12;
The source grounding of the negative pole of first capacitor C 1 and metal-oxide-semiconductor Q4;
Driving pin Dri links to each other with the gate pole of metal-oxide-semiconductor Q4;
Power pin VCC links to each other with the second external voltage input end, is used for obtaining for the required electric energy of control module 4 work from the second external voltage input end;
The first external voltage input end links to each other with the secondary coil of transformer in the present embodiment, and it can obtain electric current from the secondary coil of transformer.When the dutycycle of metal-oxide-semiconductor Q4 increased, the output voltage of inductance L increased, otherwise the output voltage of inductance L reduces, so the mode of the dutycycle that control module 4 can be by the change drive signal is controlled the size of voltage transformation module 1 output voltage.
Certainly, voltage transformation module 1 also can adopt other electronic devices and components outside the above electronic devices and components to constitute in the present embodiment, and for example metal-oxide-semiconductor Q4 also can use other semiconductor devices to replace.
Because the common voltage fluctuation of exporting of control chip is less, the degree of accuracy of magnitude of voltage is higher, keeps more stable duty so can guarantee the second triode Q2 and the 3rd triode Q3 in the division module 3.In addition, because the LED chip for driving itself all has constant voltage output pin VREF usually,, help reducing cost of products so this design can also make full use of the LED chip for driving.
As shown in Figures 2 and 3, first power consumption module 11, second power consumption module 12 of mutual parallel connection and the driving circuit that is provided for above-mentioned the utility model embodiment of described first power consumption module 11 and 12 power supplies of described second power consumption module are provided the liquid crystal TV set that the utility model embodiment is provided.
Because the identical technical characterictic of driving circuit that is provided with above-mentioned the utility model embodiment is provided the liquid crystal TV set that the utility model embodiment is provided, so also can produce identical technique effect, solve identical technical matters, no longer repeat to set forth herein.
Certainly, the driving circuit that provided of above-mentioned the utility model embodiment also can be applied on other electronic equipments outside the liquid crystal TV set.
The above; it only is embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; 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 domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (10)
1. a driving circuit is characterized in that, comprises voltage transformation module, current sample module, division module and control module, wherein:
Described voltage transformation module, be used for from external power source obtain electric current and be converted into first power consumption module that meets mutual parallel connection and the operating voltage of second power consumption module after, export described first power consumption module and described second power consumption module respectively to;
Described current sample module is used for the size of current that induced flow is crossed described first power consumption module and described second power consumption module;
Described division module, both flow through voltage on bigger one of the electric current to be used for sharing described first power consumption module and described second power consumption module;
Described control module is used for the size of current responded to according to described current sample module, controls the size of described voltage transformation module output voltage.
2. driving circuit according to claim 1 is characterized in that, described first power consumption module and second power consumption module are LED lamp bar;
And/or described voltage transformation module is the boost booster circuit;
And/or described control module is the LED chip for driving;
And/or the power consumption of described first power consumption module and second power consumption module is identical.
3. driving circuit according to claim 1, it is characterized in that, described current sample module, be used for the electric current current value less current that induced flow is crossed the electric current of described first power consumption module and flow through described second power consumption module, and described current value less current is fed back to described control module;
Described control module is used for the size according to described current value less current, controls the size of described voltage transformation module output voltage.
4. driving circuit according to claim 3, it is characterized in that, described division module inputs to described current sample module after the electric current that also is used for flowing through the electric current of described first power consumption module and to flow through described second power consumption module all is amplified to prearranged multiple.
5. driving circuit according to claim 3 is characterized in that, described current sample module comprises sampling unit, contrast unit and amplifying unit, wherein:
Described sampling unit is used for the electric current that sample streams is crossed described first power consumption module and described second power consumption module;
Described contrast unit is used to contrast electric current that flows through described first power consumption module and the size that flows through the electric current of described second power consumption module, and the current value less current is imported described amplifying unit;
Described amplifying unit is used for the current value of less current amplified and is converted to the described control module of input behind the magnitude of voltage;
Described control module, be used for when the magnitude of voltage of described amplifying unit input surpasses predefined magnitude of voltage, the control voltage transformation module stops to carry out boost operations,, control described voltage transformation module and carry out boost operations during at the magnitude of voltage of described amplifying unit input less than predefined magnitude of voltage.
6. driving circuit according to claim 5, it is characterized in that described sampling unit comprises current output terminal and first resistance between the ground and current output terminal that is connected in described second power consumption module and second resistance between the ground that is connected in described first power consumption module;
And/or described contrast unit comprises the first constant voltage input end, the 3rd resistance, first diode and second diode, wherein:
Described the 3rd resistance one end links to each other with the described first constant voltage input end, and the other end of described the 3rd resistance links to each other with the anode of described first diode and the anode of described second diode respectively;
The negative electrode of described first diode is connected between the current output terminal and described first resistance of described first power consumption module;
The negative electrode of described second diode is connected between the current output terminal and described second resistance of described second power consumption module;
And/or described amplifying unit comprises the 4th resistance of first triode and ground connection, wherein:
The base stage of described first triode links to each other with the anode of the described first constant voltage input end, described first diode and the anode of described second diode respectively;
The emitter of described first triode links to each other with described control module, described the 4th resistance respectively;
The collector of described first triode is connected between described first constant voltage input end and described the 3rd resistance.
7. driving circuit according to claim 6 is characterized in that, described division module comprises the second constant voltage input end, second triode and the 3rd triode, wherein:
The base stage of the base stage of described second triode and described the 3rd triode links to each other with the described second constant voltage input end respectively;
The collector of described second triode links to each other with the current output terminal of described first power consumption module;
The collector of described the 3rd triode links to each other with the current output terminal of described second power consumption module;
The emitter of described second triode links to each other with the negative electrode of described first resistance, described first diode respectively;
The emitter of described second triode links to each other with the negative electrode of described second resistance, described second diode respectively.
8. driving circuit according to claim 7 is characterized in that described voltage transformation module comprises inductance, first electric capacity and metal-oxide-semiconductor, wherein:
A wherein end of described inductance links to each other with the positive pole of the first external voltage input end and described first electric capacity respectively;
The wherein other end of described inductance links to each other with the current input terminal of the drain electrode of described metal-oxide-semiconductor and described first power consumption module, the current input terminal of described second power consumption module;
The negative pole of described first electric capacity and the source grounding of described metal-oxide-semiconductor;
Described control module also comprises driving pin, power pin and feedback pin, wherein:
Described driving pin links to each other with the gate pole of described metal-oxide-semiconductor;
Described power pin links to each other with the second external voltage input end, is used for obtaining for the required electric energy of described control module work from the described second external voltage input end;
Described control module is used for responding to the described the 4th ohmically voltage by described feedback pin, and according to the size of the described voltage of sensing, and is used to control the whether drive signal of conducting of described metal-oxide-semiconductor by described driving pin output.
9. driving circuit according to claim 8 is characterized in that, described control module is the control chip that is provided with the constant voltage output pin, and the described second constant voltage input end is the described constant voltage output pin of described control chip.
10. a liquid crystal TV set is characterized in that, comprises first power consumption module, second power consumption module of mutual parallel connection and is the arbitrary described driving circuit of claim 1 to 9 of described first power consumption module and the power supply of described second power consumption module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201178817U CN202008814U (en) | 2011-04-20 | 2011-04-20 | Driving circuit and liquid crystal television |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201178817U CN202008814U (en) | 2011-04-20 | 2011-04-20 | Driving circuit and liquid crystal television |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103560673A (en) * | 2013-11-15 | 2014-02-05 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| CN103680414A (en) * | 2012-09-13 | 2014-03-26 | 上海江森自控汽车电子有限公司 | LCD backlight constant current drive circuit |
| CN105390108A (en) * | 2015-12-08 | 2016-03-09 | 深圳市华星光电技术有限公司 | Driving circuit |
| CN106910475A (en) * | 2017-04-28 | 2017-06-30 | 四川长虹电器股份有限公司 | New type liquid crystal television carries on the back lamp drive circuit |
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2011
- 2011-04-20 CN CN2011201178817U patent/CN202008814U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103680414A (en) * | 2012-09-13 | 2014-03-26 | 上海江森自控汽车电子有限公司 | LCD backlight constant current drive circuit |
| CN103680414B (en) * | 2012-09-13 | 2016-01-06 | 上海伟世通汽车电子系统有限公司 | A kind of LCD backlight constant current drive circuit |
| CN103560673A (en) * | 2013-11-15 | 2014-02-05 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| CN105390108A (en) * | 2015-12-08 | 2016-03-09 | 深圳市华星光电技术有限公司 | Driving circuit |
| US9842554B2 (en) | 2015-12-08 | 2017-12-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Driving circuit |
| CN105390108B (en) * | 2015-12-08 | 2018-01-23 | 深圳市华星光电技术有限公司 | Drive circuit |
| CN106910475A (en) * | 2017-04-28 | 2017-06-30 | 四川长虹电器股份有限公司 | New type liquid crystal television carries on the back lamp drive circuit |
| CN106910475B (en) * | 2017-04-28 | 2019-06-14 | 四川长虹电器股份有限公司 | New type liquid crystal television back light driving circuit |
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Granted publication date: 20111012 |