CN201994046U - Driving circuit and liquid crystal television - Google Patents
Driving circuit and liquid crystal television Download PDFInfo
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- CN201994046U CN201994046U CN2011201142228U CN201120114222U CN201994046U CN 201994046 U CN201994046 U CN 201994046U CN 2011201142228 U CN2011201142228 U CN 2011201142228U CN 201120114222 U CN201120114222 U CN 201120114222U CN 201994046 U CN201994046 U CN 201994046U
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Abstract
The embodiment of the utility model provides a driving circuit and a liquid crystal television, which relate to the technical field of electronics and solve the technical problem of higher cost because many electronic devices are used in the existing driving circuit. The driving circuit comprises an electric energy input end, a first power consumption module, a second power consumption module and an energy storage module, wherein the voltage input end of the first power consumption module is connected with the electric energy input end, the voltage output end of the first power consumption module and the voltage input end of the second power consumption module are connected with the first ground, the voltage output end of the second power consumption module is connected with the second ground, the first ground and the second ground are not mutually connected, both ends of the energy storage module are respectively connected with the electric energy output end and the voltage output end of the second power consumption module. The liquid crystal television comprises a case, a main board and the driving circuit provided by the embodiment of the utility model, the main board is positioned in the case, and the case is connected with the ground. The driving circuit is used for driving power consumption devices such as light emitting diode (LED) lamp strips and the like.
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 utility model, 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, solve existing driving circuit and existed the use electronic devices and components many, caused cost to compare technical problems of high.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
The driving circuit that the utility model embodiment provides comprises electric energy input end, first power consumption module, second power consumption module and energy-storage module, wherein:
The voltage input end of described first power consumption module links to each other with described electric energy input end;
Connect first ground between the voltage input end of the voltage output end of described first power consumption module and described second power consumption module;
The voltage output end of described second power consumption module connects second ground, and described first ground does not link to each other mutually with described second ground;
The two ends of described energy-storage module link to each other with the voltage output end of the described electric energy input end and second power consumption module respectively;
Described energy-storage module is used to store the part electric energy by described electric energy input end input, and inputs to described first power consumption module, described second power consumption module successively, is described first power consumption module, the power supply of described second power consumption module.
Further, described energy-storage module is an electric capacity or two above capacitances in series or is formed in parallel;
And/or the power consumption of described first power consumption module and described second power consumption module is identical;
And/or described first power consumption module and described second power consumption module are a LED or are the LED lamp bar that two above LED serial or parallel connections form;
And/or described first ground is the earth.
Further, this driving circuit also comprises voltage transformation module, rectification module, control module and current sample module, wherein:
Described voltage transformation module is used for inputing to described rectification module from the external power source received current and after being converted into the operating voltage of described first power consumption module and described second power consumption module;
Described rectification module, being used for the alternating current rectification is from described electric energy input end output after the DC current
Described control module is used for crossing by described current sample module acquisition stream the electric current of described first power consumption module and described second power consumption module, and controls described voltage transformation module according to the size of the described electric current of gathering and whether carry out voltage transitions work.
Further, described voltage transformation module is the boost booster circuit;
And/or described current sample module is a resistance, and described resistance is connected between the voltage output end and described first ground of described first power consumption module, and perhaps, described resistance is connected between the voltage output end and described second ground of described second power consumption module.
And/or described rectification module is a diode.
Further, 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, and the other end of described inductance links to each other with the drain electrode of described metal-oxide-semiconductor and described electric energy input end;
The negative pole of described first electric capacity and the source electrode of described metal-oxide-semiconductor all link to each other with described second ground;
The gate pole of described metal-oxide-semiconductor links to each other with described control module;
Described control module is used for the emission of the gate pole of described metal-oxide-semiconductor in order to control the whether drive signal of conducting of described metal-oxide-semiconductor.
Further, described control module is the LED chip for driving, and described control module comprises and drive pin, power pin, feedback pin and ground pin, wherein:
Described current sample module is connected between the voltage output end and described second ground of described second power consumption module, described feedback pin is connected between the voltage input end of described current sample module and described second power consumption module, described driving pin links to each other with the gate pole of described metal-oxide-semiconductor, and described ground pin links to each other with described second ground; Perhaps, described current sample module is connected between the voltage output end and described first ground of described first power consumption module, described ground pin links to each other with described first ground, described feedback pin is connected between the voltage output end of described current sample module and described first power consumption module, also be connected with isolation module between the gate pole of described driving pin and described metal-oxide-semiconductor, described isolation module is used for the gate pole of the described metal-oxide-semiconductor of input after the safe voltage that voltage transitions with described drive signal is 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, be used for crossing the electric current of described first power consumption module and described second power consumption module, and be used to control the whether drive signal of conducting of described metal-oxide-semiconductor by described driving pin output according to the size of the described electric current of gathering by described feedback pin acquisition stream.
Further, described isolation module is photo-coupler or transformer.
Further, described isolation module comprises transformer, NPN triode, PNP triode, second electric capacity, first resistance, first diode and constant voltage input end, wherein:
Described driving pin links to each other with the base stage of described NPN triode and the base stage of described PNP triode respectively;
The collector of described NPN triode links to each other with described constant voltage input end by described first resistance, and its emitter links to each other with the emitter of described PNP triode and the current input terminal of described transformer respectively;
The collector of described PNP triode links to each other with the current output terminal and described first ground of described transformer respectively;
A wherein end of described second electric capacity links to each other with a wherein end of the secondary coil of described transformer, and the other end of described second electric capacity links to each other with the gate pole of described metal-oxide-semiconductor;
The other end of the secondary coil of described transformer links to each other with the source electrode of described metal-oxide-semiconductor, and should link to each other with the positive pole of described first diode by end, and the negative pole of described first diode is connected between the gate pole of described second electric capacity and described metal-oxide-semiconductor.
Further, this driving circuit also comprises transformer, and described transformer comprises primary coil and secondary coil, and the secondary coil of described transformer comprises first winding, second winding and the tertiary winding; Wherein:
A wherein end of described first winding links to each other with the positive pole of second diode, and the described first external voltage input end is the negative pole of described second diode;
A wherein end of described second winding links to each other with the positive pole of the 3rd diode, and the described second external voltage input end is the negative pole of described the 3rd diode;
A wherein end of the described tertiary winding links to each other with the positive pole of the 4th diode, and the negative pole of described the 4th diode links to each other with the mainboard of described first ground and liquid crystal TV set respectively, and is the main board power supply of described liquid crystal TV set;
Whether the mainboard of described liquid crystal TV set is used to control described control module and works, and also is used to control the dutycycle of the described drive signal that described control module sends.
This liquid crystal TV set comprises shell, is positioned at the mainboard of shell and the driving circuit that above-mentioned the utility model embodiment is provided, and described shell links to each other with the earth.
Compared with prior art, the utility model embodiment provides and can produce following at least technique effect in above-mentioned arbitrary technical scheme:
Because the driving circuit that the utility model embodiment is provided, the voltage input end of first power consumption module links to each other with the electric energy input end; Connect first ground between the voltage input end of the voltage output end of first power consumption module and second power consumption module; The voltage output end of second power consumption module connects second ground; The two ends of energy-storage module link to each other with the voltage output end of the electric energy input end and second power consumption module respectively, and energy-storage module can be stored the part electric energy by the input of electric energy input end, and input to first power consumption module successively, second power consumption module, it is first power consumption module, the power supply of second power consumption module, this shows, first power consumption module and second power consumption module have constituted series circuit, the process that electric current flows through this series circuit is: first power consumption module → first ground → second power consumption module → second ground → energy-storage module, in the series circuit everywhere electric current be consistent, be the comparison equilibrium so flow through the electric current of first power consumption module and second power consumption module;
Simultaneously, though the voltage that loads between the voltage output end of the electric energy input end and second power consumption module is first power consumption module, the operating voltage absolute value sum of second power consumption module, but owing to connect first ground between the voltage input end of the voltage output end of first power consumption module and second power consumption module, and the current potential on ground is 0, so loading on the voltage that the voltage between first ground that is connect between the voltage input end of the voltage output end of first power consumption module and first power consumption module and second power consumption module promptly loads on first power consumption module is not first power consumption module, the operating voltage absolute value sum of second power consumption module, but it is relevant with the resistance of the electric current that flows through first power consumption module and first power consumption module, if the electric current that flows through first power consumption module is no more than the working current of first power consumption module, the voltage that loads on so on first power consumption module can be above the operating voltage of first power consumption module yet, in like manner, loading on the voltage output end of first power consumption module and first ground that voltage input end connect of second power consumption module and the voltage that the voltage between second power consumption module promptly loads on second power consumption module is not first power consumption module yet, the operating voltage absolute value sum of second power consumption module, but it is relevant with the resistance of the electric current that flows through first power consumption module and first power consumption module, if the electric current that flows through first power consumption module is no more than the working current of first power consumption module, the voltage that loads on so on first power consumption module can be above the operating voltage of first power consumption module yet, for example: when first power consumption module and second power consumption module are the identical LED lamp bar of power consumption, load on voltage on first power consumption module and be 1/2 of voltage between the voltage output end that loads on the electric energy input end and second power consumption module, the voltage that loads on second power consumption module only is-1/2 of the voltage between the voltage output end that loads on the electric energy input end and second power consumption module, this shows, when the electric current by the input of electric energy input end meets first power consumption module, during the working current of second power consumption module, first power consumption module, the voltage that second power consumption module is born also can be in first power consumption module, within the scope of the second power consumption module operating voltage, first power consumption module, second power consumption module can't be burnt, so when first power consumption module, when second power consumption module is LED lamp bar, a set electric energy input end of the utility model embodiment only needs to connect a power supply (for example boost booster circuit), can realize the function that the existing driving circuit that is LED lamp bar is powered can be realized;
Compared with prior art, because a set electric energy input end only needs to connect a power supply (for example boost booster circuit) among the utility model embodiment, just can be two LED lamp bar power supplies simultaneously, and then the electronic devices and components of the required employing of power supply (for example boost booster circuit) have been saved, electronic devices and components are few more, cost also can be low more, exists the use electronic devices and components many so solved existing driving circuit, causes cost to compare technical problems of high.
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 in-built synoptic diagram of the driving circuit that a kind of embodiment that Fig. 2 is provided for the utility model embodiment 1 provides;
The dividing potential drop synoptic diagram of Fig. 3 first power consumption module and second power consumption module when being connected with first ground between first power consumption module in the driving circuit shown in Figure 2 and second power consumption module and when not being connected with first ground;
The in-built synoptic diagram of the driving circuit that Fig. 4 provides for another embodiment of the utility model embodiment 1;
The synoptic diagram of the concrete enforcement circuit of the driving circuit that Fig. 5 provides for the utility model embodiment 1 shown in Figure 4;
The synoptic diagram of the concrete enforcement circuit of the driving circuit that Fig. 6 is provided for the utility model embodiment 2;
Fig. 7 is the synoptic diagram of the concrete enforcement circuit of isolation module among Fig. 6.
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 electronic devices and components driving circuit fewer, with low cost and a kind of liquid crystal TV set that is provided with this driving circuit of using.
Embodiment 1:
As shown in Figures 2 and 3, the driving circuit that the utility model embodiment is provided comprises driving circuit, comprises electric energy input end Uin, first power consumption module 1, second power consumption module 2 and energy-storage module 3, wherein:
The voltage input end of first power consumption module 1 links to each other with electric energy input end Uin;
Meet the first ground GND1 between the voltage input end of the voltage output end of first power consumption module 1 and second power consumption module 2;
The voltage output end of second power consumption module 2 meets the second ground GND2, and the first ground GND1 does not link to each other mutually with the second ground GND2;
The two ends of energy-storage module 3 link to each other with the voltage output end of the electric energy input end Uin and second power consumption module 2 respectively;
Energy-storage module 3 is used to store the part electric energy by electric energy input end Uin input, and inputs to first power consumption module 1, second power consumption module 2 successively, is first power consumption module 1,2 power supplies of second power consumption module.
Because the driving circuit that the utility model embodiment is provided, the voltage input end of first power consumption module 1 links to each other with electric energy input end Uin; Meet the first ground GND1 between the voltage input end of the voltage output end of first power consumption module 1 and second power consumption module 2; The voltage output end of second power consumption module 2 meets the second ground GND2; The two ends of energy-storage module 3 link to each other with the voltage output end of the electric energy input end Uin and second power consumption module 2 respectively, and energy-storage module 3 can be stored the part electric energy by electric energy input end Uin input, and input to first power consumption module 1 successively, second power consumption module 2, it is first power consumption module 1,2 power supplies of second power consumption module, this shows, first power consumption module 1 and second power consumption module 2 have constituted series circuit, the process that electric current flows through this series circuit is: first power consumption module, 1 → the first ground GND1 → second power consumption module, 2 → the second ground GND2 → energy-storage modules 3, in the series circuit everywhere electric current be consistent, are comparison equilibriums so flow through the electric current of first power consumption module 1 and second power consumption module 2;
Simultaneously, though the voltage that loads between the voltage output end of the electric energy input end Uin and second power consumption module 2 is first power consumption module 1, the operating voltage absolute value sum of second power consumption module 2, but owing to meet the first ground GND1 between the voltage input end of the voltage output end of first power consumption module 1 and second power consumption module 2, and the current potential on ground is 0, so loading on the voltage that the voltage between the first ground GND1 that is connect between the voltage input end of the voltage output end of first power consumption module 1 and first power consumption module 1 and second power consumption module 2 promptly loads on first power consumption module 1 is not first power consumption module 1, the operating voltage absolute value sum of second power consumption module 2, but it is relevant with the resistance of the electric current that flows through first power consumption module 1 and first power consumption module 1, if the electric current that flows through first power consumption module 1 is no more than the working current of first power consumption module 1, the voltage that loads on so on first power consumption module 1 can be above the operating voltage of first power consumption module 1 yet, in like manner, loading on the voltage output end of first power consumption module 1 and the first ground GND1 that voltage input end connect of second power consumption module 2 and the voltage that the voltage between second power consumption module 2 promptly loads on second power consumption module 2 is not first power consumption module 1 yet, the operating voltage absolute value sum of second power consumption module 2, but it is relevant with the resistance of the electric current that flows through first power consumption module 1 and first power consumption module 1, if the electric current that flows through first power consumption module 1 is no more than the working current of first power consumption module 1, the voltage that loads on so on first power consumption module 1 can be above the operating voltage of first power consumption module 1 yet, for example: when first power consumption module 1 and second power consumption module 2 are the identical LED lamp bar of power consumption, load on voltage on first power consumption module 1 and be 1/2 of voltage between the voltage output end that loads on the electric energy input end Uin and second power consumption module 2, the voltage that loads on second power consumption module 2 only is-1/2 of the voltage between the voltage output end that loads on the electric energy input end Uin and second power consumption module 2, this shows, when the electric current by electric energy input end Uin input meets first power consumption module 1, during the working current of second power consumption module 2, first power consumption module 1, the voltage that second power consumption module 2 is born also can be in first power consumption module 1, within the scope of second power consumption module, 2 operating voltage, first power consumption module 1, second power consumption module 2 can't be burnt, so when first power consumption module 1, when second power consumption module 2 is LED lamp bar, a set electric energy input end Uin of the utility model embodiment only needs to connect a power supply (for example boost booster circuit), can realize the function that the existing driving circuit that is LED lamp bar is powered can be realized;
Compared with prior art, because a set electric energy input end Uin only needs to connect a power supply (for example boost booster circuit) among the utility model embodiment, just can be two LED lamp bar power supplies simultaneously, and then the electronic devices and components of the required employing of power supply (for example boost booster circuit) have been saved, electronic devices and components are few more, cost also can be low more, exists the use electronic devices and components many so solved existing driving circuit, causes cost to compare technical problems of high.
The first ground GND1 is not connected in reason mutually mutually with the second ground GND2 and is: if the first ground GND1 is connected with the second ground GND2, then second power consumption module 2 is understood by short circuit and can't operate as normal.
As shown in Figure 4 and Figure 5, energy-storage module 3 is an electric capacity or two above capacitances in series or is formed in parallel in the present embodiment;
And/or the power consumption of first power consumption module 1 and second power consumption module 2 is identical;
And/or first power consumption module 1 and second power consumption module 2 are a LED or are the LED lamp bar that two above LED serial or parallel connections form;
And/or the first ground GND1 is a earth.
Electric capacity has and connects electric energy storage device simple, with low cost, helps reducing the cost of the driving circuit that the utility model embodiment provided.
As shown in Figure 3, the power consumption of first power consumption module 1 and second power consumption module 2 is identical, and when being LED lamp bar, if first power consumption module 1 and 2 series connection of second power consumption module, and between first power consumption module 1 and second power consumption module 2 when unearthed, voltage between the voltage output end of electric energy input end Uin to the second power consumption module 2 is 300V, and when meeting the first ground GND1 between the voltage input end of the voltage output end of first power consumption module 1 and second power consumption module 2, load on voltage on first power consumption module 1 and be 1/2 of voltage between the voltage output end that loads on the electric energy input end Uin and second power consumption module 2, be 150V, the voltage that loads on second power consumption module 2 only for-1/2 of the voltage between the voltage output end that loads on the electric energy input end Uin and second power consumption module 2 is-150V, owing to equate during the magnitude of voltage that two power consumption module are born, size ratio by the voltage of electric energy input end Uin input is easier to control, and power consumption module is difficult for burning because the voltage that is carried is excessive.
Certainly, first power consumption module 1 and second power consumption module 2 also can be other electronics power consumption devices outside the LED lamp bar in the present embodiment.
Because the periphery of present embodiment first power consumption module 1 and second power consumption module 2 also needs to connect other electronic devices and components, and many electronic devices and components (for example chip) need a reference voltage can operate as normal, and the reference voltage of different electronic devices and components is also inconsistent, so the first ground GND1 that is connect between the voltage input end of the voltage output end of first power consumption module 1 and second power consumption module 2 and the second ground GND2 that voltage output end connect of second power consumption module 2 are not simultaneously, can provide two kinds of reference voltages at least, and then the electronic devices and components that can avoid being connected in the periphery of first power consumption module 1 and second power consumption module 2 can not interact.
The first ground GND1 is preferably the earth.When the first ground GND1 was preferably the earth, when short circuit occurring as if first power consumption module 1, electric current can flow directly into the earth, can not impact other electronic devices and components, so the security of the circuit that strengthens.
As shown in Figure 4 and Figure 5, driving circuit in the present embodiment also comprises voltage transformation module 4, rectification module 5, control module 6 and current sample module 7, wherein:
The direct current of rectification module 5 outputs can guarantee that LED lamp bar continues, stable lighting.
When the current ratio that flows through first power consumption module 1 and second power consumption module 2 of being gathered by current sample module 7 when control module 6 is less or bigger, then may command voltage transformation module 4 carries out voltage transitions work, make the voltage of voltage transformation module 4 outputs increase or reduce, like this, just, can adjust the size of current that it is exported by the mode of adjusting voltage transformation module 4 output voltages.
As shown in Figure 4 and Figure 5, voltage transformation module 4 is the boost booster circuit in the present embodiment;
And/or current sample module 7 is a resistance, and resistance is connected between the voltage output end and the first ground GND1 of first power consumption module 1, and perhaps, resistance is connected between the voltage output end and the second ground GND2 of second power consumption module 2.
And/or rectification module 5 is a diode.
The boost booster circuit is not only with low cost, and is convenient to control.The advantage that diode has is with low cost, attended operation is fairly simple.
When current sample module 7 is a resistance, and resistance value one regularly, when electric current is arranged through resistance, ohmically voltage also is certain, like this, by detecting the voltage on the current sample module 7, just can detect the situation of the electric current that flows through first power consumption module 1 and second power consumption module 2.
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, and the other end of inductance L links to each other with drain electrode and the electric energy input end Uin of metal-oxide-semiconductor Q;
The source electrode of the negative pole of first capacitor C 1 and metal-oxide-semiconductor Q all links to each other with the second ground GND2;
The gate pole of metal-oxide-semiconductor Q links to each other with control module 6;
When metal-oxide-semiconductor Q ends, the inductance L storaging current, the voltage of input electric energy input end Uin raises, otherwise, during metal-oxide-semiconductor Q conducting, the inductance L release current, the voltage of input electric energy input end Uin reduces.
Feedback pin Cs is connected between the voltage input end of the current sample module 7 and second power consumption module 2;
Driving pin Dri links to each other with the gate pole of metal-oxide-semiconductor Q;
Ground pin GND links to each other with the second ground GND2;
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 6 work from the second external voltage input end;
Because the source electrode of metal-oxide-semiconductor Q links to each other with the second ground GND2, the ground pin GND of control module 6 also links to each other with the second ground GND2, so the reference voltage of metal-oxide-semiconductor Q and the reference voltage of control module 6 are consistent at this moment, control module 6 by being used to of driving that pin Dri exported control metal-oxide-semiconductor Q whether the drive signal of conducting can not surpass the safe voltage of metal-oxide-semiconductor Q usually, so can not burn out metal-oxide-semiconductor Q, and then guarantee the reliability of present embodiment driving circuit.
Driving circuit in the present embodiment also comprises transformer T20, and transformer T20 comprises primary coil and secondary coil, and the secondary coil of transformer T20 comprises first winding, second winding and the tertiary winding, wherein:
A wherein end of first winding links to each other with the positive pole of the second diode VD2, and the first external voltage input end is the negative pole of the second diode VD2;
A wherein end of second winding links to each other with the positive pole of the 3rd diode VD3, and the second external voltage input end is the negative pole of the 3rd diode VD3;
A wherein end of the tertiary winding links to each other with the positive pole of the 4th diode VD4, and the negative pole of the 4th diode VD4 links to each other with the mainboard of the first ground GND1 and liquid crystal TV set respectively, and is the main board power supply of liquid crystal TV set;
Whether the mainboard of liquid crystal TV set is used to control control module 6 and works, and also is used to control the dutycycle of the drive signal that control module 6 sends.
Three windings are respectively three different power digital circuit power supplies, can not interact each other.
Because the mainboard of liquid crystal TV set can be that the mode of SW signal is controlled control module 6 and entered duty or quit work by sending enable signal usually; by sending dim signal is that the mode of pwm signal is controlled the dutycycle of control module 6 from the drive signal that drives pin Dri and send, and then regulates the brightness of LED lamp bar by the mode of adjusting the drive signal dutycycle.
Embodiment 2:
As Fig. 4, Fig. 6 and shown in Figure 7, present embodiment is substantially the same manner as Example 1, and its difference is: current sample module 7 is connected between the voltage output end and the first ground GND1 of first power consumption module 1 in the present embodiment;
Ground pin GND links to each other with the first ground GND1;
Feedback pin Cs is connected between the voltage output end of the current sample module 7 and first power consumption module 1;
Also be connected with isolation module T2 between the gate pole of driving pin Dri and metal-oxide-semiconductor Q;
Isolation module T2 is used for voltage transitions with drive signal and is the gate pole of input metal-oxide-semiconductor Q after the safe voltage of metal-oxide-semiconductor Q.
Because the ground pin GND of control module 6 links to each other with the first ground GND1 in the present embodiment, and the collector of metal-oxide-semiconductor Q links to each other with the second ground GND2, because the ground that control module 6 is connect is different with the ground that metal-oxide-semiconductor Q is connect, so its reference voltage is also inequality, so the thing that very easily occurs causing metal-oxide-semiconductor Q to burn because of the drive signal overtension of control module 6 outputs takes place, so increase isolation module T2 in the present embodiment, be the gate pole of input metal-oxide-semiconductor Q after the safe voltage of metal-oxide-semiconductor Q by isolation module T2, thereby avoid the drive signal overtension and metal-oxide-semiconductor Q is burnt the voltage transitions of drive signal.
Isolation module T2 is photo-coupler or transformer in the present embodiment.Photo-coupler or transformer all can play the effect of voltage of transformation, thereby reduce the voltage of the drive signal of control module 6 outputs, prevent that metal-oxide-semiconductor Q from burning.Coupling mechanism or transformer have ease of connection, the advantage of with low cost, dependable performance, suitable being applied among the utility model embodiment.
As shown in Figure 6 and Figure 7, isolation module T2 comprises transformer T20, NPN triode V1, PNP triode V2, second electric capacity, first resistance R 1, the first diode VD1 and constant voltage input end V0 in the present embodiment, wherein:
Driving pin Dri links to each other with the base stage of NPN triode V1 and the base stage of PNP triode V2 respectively;
The collector of NPN triode V1 links to each other with constant voltage input end V0 by first resistance R 1, and its emitter links to each other with the emitter of PNP triode V2 and the current input terminal of transformer T20 primary coil respectively;
The collector of PNP triode V2 links to each other with the current output terminal and the first ground GND1 of transformer T20 primary coil respectively;
A wherein end of second electric capacity links to each other with a wherein end of the secondary coil of transformer T20, and the other end of second electric capacity links to each other with the gate pole of metal-oxide-semiconductor Q;
The other end of the secondary coil of transformer T20 links to each other with the source electrode of metal-oxide-semiconductor Q, and should link to each other with the positive pole of the first diode VD1 by end, and the negative pole of the first diode VD1 is connected between the gate pole of second electric capacity and metal-oxide-semiconductor Q.
NPN triode V1 plays the effect that electric current amplifies, and can amplify the electric current of drive signal, thereby strengthens the driving force of drive signal, makes the conducting of metal-oxide-semiconductor Q and speeding up of ending.PNP triode V2 can drive signal before the input positive current, the negative current of the remnants in the transformer T20 primary coil is inserted the first ground GND1, thereby avoid the influence of remaining negative current to metal-oxide-semiconductor Q, makes the conducting of metal-oxide-semiconductor Q and speeding up of ending.
The secondary coil of transformer T20, second electric capacity and the first diode VD1 can constitute a loop, make the negative current of transformer T20 output also can flow into second electric capacity, thereby negative current is released, avoid the influence of negative current to circuit, when making the secondary coil output positive current of transformer T20, can act on fast on the metal-oxide-semiconductor Q.
As shown in Figure 3, the liquid crystal TV set that the utility model embodiment is provided comprises shell 9, is positioned at the mainboard of shell 9 and the driving circuit that above-mentioned the utility model embodiment is provided, and shell 9 links to each other with the earth.
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 above-mentioned the utility model embodiment is provided in the present embodiment also can be applied on other electronic equipments outside the liquid crystal TV set, and first power consumption module 1 and second power consumption module 2 also can be other power consumption devices outside the LED lamp bar as shown in Figure 2.
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 electric energy input end, first power consumption module, second power consumption module and energy-storage module, wherein:
The voltage input end of described first power consumption module links to each other with described electric energy input end;
Connect first ground between the voltage input end of the voltage output end of described first power consumption module and described second power consumption module;
The voltage output end of described second power consumption module connects second ground, and described first ground does not link to each other mutually with described second ground;
The two ends of described energy-storage module link to each other with the voltage output end of the described electric energy input end and second power consumption module respectively;
Described energy-storage module is used to store the part electric energy by described electric energy input end input, and inputs to described first power consumption module, described second power consumption module successively, is described first power consumption module, the power supply of described second power consumption module.
2. driving circuit according to claim 1 is characterized in that, described energy-storage module is an electric capacity or two above capacitances in series or is formed in parallel;
And/or the power consumption of described first power consumption module and described second power consumption module is identical;
And/or described first power consumption module and described second power consumption module are a LED or are the LED lamp bar that two above LED serial or parallel connections form;
And/or described first ground is the earth.
3. driving circuit according to claim 2 is characterized in that, this driving circuit also comprises voltage transformation module, rectification module, control module and current sample module, wherein:
Described voltage transformation module is used for inputing to described rectification module from the external power source received current and after being converted into the operating voltage of described first power consumption module and described second power consumption module;
Described rectification module, being used for the alternating current rectification is from described electric energy input end output after the DC current
Described control module is used for crossing by described current sample module acquisition stream the electric current of described first power consumption module and described second power consumption module, and controls described voltage transformation module according to the size of the described electric current of gathering and whether carry out voltage transitions work.
4. driving circuit according to claim 3 is characterized in that, described voltage transformation module is the boost booster circuit;
And/or described current sample module is a resistance, and described resistance is connected between the voltage output end and described first ground of described first power consumption module, and perhaps, described resistance is connected between the voltage output end and described second ground of described second power consumption module.
And/or described rectification module is a diode.
5. driving circuit according to claim 4 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, and the other end of described inductance links to each other with the drain electrode of described metal-oxide-semiconductor and described electric energy input end;
The negative pole of described first electric capacity and the source electrode of described metal-oxide-semiconductor all link to each other with described second ground;
The gate pole of described metal-oxide-semiconductor links to each other with described control module;
Described control module is used for the emission of the gate pole of described metal-oxide-semiconductor in order to control the whether drive signal of conducting of described metal-oxide-semiconductor.
6. driving circuit according to claim 5 is characterized in that, described control module is the LED chip for driving, and described control module comprises and drive pin, power pin, feedback pin and ground pin, wherein:
Described current sample module is connected between the voltage output end and described second ground of described second power consumption module, described feedback pin is connected between the voltage input end of described current sample module and described second power consumption module, described driving pin links to each other with the gate pole of described metal-oxide-semiconductor, and described ground pin links to each other with described second ground; Perhaps, described current sample module is connected between the voltage output end and described first ground of described first power consumption module, described ground pin links to each other with described first ground, described feedback pin is connected between the voltage output end of described current sample module and described first power consumption module, also be connected with isolation module between the gate pole of described driving pin and described metal-oxide-semiconductor, described isolation module is used for the gate pole of the described metal-oxide-semiconductor of input after the safe voltage that voltage transitions with described drive signal is 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, be used for crossing the electric current of described first power consumption module and described second power consumption module, and be used to control the whether drive signal of conducting of described metal-oxide-semiconductor by described driving pin output according to the size of the described electric current of gathering by described feedback pin acquisition stream.
7. driving circuit according to claim 6 is characterized in that, described isolation module is photo-coupler or transformer.
8. driving circuit according to claim 6 is characterized in that, described isolation module comprises transformer, NPN triode, PNP triode, second electric capacity, first resistance, first diode and constant voltage input end, wherein:
Described driving pin links to each other with the base stage of described NPN triode and the base stage of described PNP triode respectively;
The collector of described NPN triode links to each other with described constant voltage input end by described first resistance, and its emitter links to each other with the emitter of described PNP triode and the current input terminal of described transformer respectively;
The collector of described PNP triode links to each other with the current output terminal and described first ground of described transformer respectively;
A wherein end of described second electric capacity links to each other with a wherein end of the secondary coil of described transformer, and the other end of described second electric capacity links to each other with the gate pole of described metal-oxide-semiconductor;
The other end of the secondary coil of described transformer links to each other with the source electrode of described metal-oxide-semiconductor, and should link to each other with the positive pole of described first diode by end, and the negative pole of described first diode is connected between the gate pole of described second electric capacity and described metal-oxide-semiconductor.
9. driving circuit according to claim 6 is characterized in that, this driving circuit also comprises transformer, and described transformer comprises primary coil and secondary coil, and the secondary coil of described transformer comprises first winding, second winding and the tertiary winding; Wherein:
A wherein end of described first winding links to each other with the positive pole of second diode, and the described first external voltage input end is the negative pole of described second diode;
A wherein end of described second winding links to each other with the positive pole of the 3rd diode, and the described second external voltage input end is the negative pole of described the 3rd diode;
A wherein end of the described tertiary winding links to each other with the positive pole of the 4th diode, and the negative pole of described the 4th diode links to each other with the mainboard of described first ground and liquid crystal TV set respectively, and is the main board power supply of described liquid crystal TV set;
Whether the mainboard of described liquid crystal TV set is used to control described control module and works, and also is used to control the dutycycle of the described drive signal that described control module sends.
10. a liquid crystal TV set is characterized in that, comprises shell, is positioned at the mainboard and the arbitrary described driving circuit of claim 1 to 9 of shell, and described shell links to each other with the earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201142228U CN201994046U (en) | 2011-04-18 | 2011-04-18 | Driving circuit and liquid crystal television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201142228U CN201994046U (en) | 2011-04-18 | 2011-04-18 | Driving circuit and liquid crystal television |
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| Publication Number | Publication Date |
|---|---|
| CN201994046U true CN201994046U (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201142228U Expired - Lifetime CN201994046U (en) | 2011-04-18 | 2011-04-18 | Driving circuit and liquid crystal television |
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| Country | Link |
|---|---|
| CN (1) | CN201994046U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750913A (en) * | 2011-04-18 | 2012-10-24 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| WO2013159476A1 (en) * | 2012-04-26 | 2013-10-31 | 青岛海信信芯科技有限公司 | Multichannel led backlight source drive circuit, and liquid crystal display device using same |
| 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 |
| WO2018148998A1 (en) * | 2017-02-14 | 2018-08-23 | 深圳市华星光电技术有限公司 | Circuit and liquid crystal display device for reducing power consumption of power supply |
-
2011
- 2011-04-18 CN CN2011201142228U patent/CN201994046U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750913A (en) * | 2011-04-18 | 2012-10-24 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| WO2013159476A1 (en) * | 2012-04-26 | 2013-10-31 | 青岛海信信芯科技有限公司 | Multichannel led backlight source drive circuit, and liquid crystal display device using same |
| WO2018148998A1 (en) * | 2017-02-14 | 2018-08-23 | 深圳市华星光电技术有限公司 | Circuit and liquid crystal display device for reducing power consumption of power supply |
| 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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