CN102750913B - Driving circuit and liquid crystal television - Google Patents
Driving circuit and liquid crystal television Download PDFInfo
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- CN102750913B CN102750913B CN201110096857.4A CN201110096857A CN102750913B CN 102750913 B CN102750913 B CN 102750913B CN 201110096857 A CN201110096857 A CN 201110096857A CN 102750913 B CN102750913 B CN 102750913B
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Abstract
The embodiment of the invention provides a driving circuit and a liquid crystal television, and relates to the technical field of electronics, and the driving circuit is used for solving the technical problems that the existing driving circuit uses more electronic components which result in a high cost. 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; a first ground is connected between the voltage output end of the first power consumption module and the voltage input end of the second power consumption module; the voltage output end of the second power consumption module is connected with a second ground, and the first ground is not connected with the second ground; and two ends of the energy storage module are respectively connected with the electric energy input end and the voltage output end of the second power consumption module. The liquid crystal television comprises a shell, a mainboard which is positioned in the shell, and the driving circuit which is provided by the embodiment of the invention, wherein the shell is connected with the ground. The driving circuit is used for driving power consumption devices such as light-emitting diode (LED) light bars.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of drive circuit and be provided with the liquid crystal TV set of this drive 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 drive circuit is the power supply for powering for its backlight in the electronic equipment such as liquid crystal TV set, LCD computer.
As shown in Figure 1, backlight in liquid crystal TV set is mainly LED lamp bar, existing liquid crystal TV set generally includes two LED lamp bar, for the drive circuit that LED lamp bar is powered, comprise Liang Ge drive circuit branch, each drive circuit branches into a LED lamp bar and powers, and each drive circuit branch includes boost booster circuit, diode, electrical energy inputs, LED drive chip and sampling resistor, wherein:
Boost booster circuit, for from external power source received current and raised be a LED lamp bar operating voltage after input to diode;
Diode, for by alternating current rectification being the positive pole exporting LED lamp bar after direct current from electrical energy inputs to;
LED drive chip, for being flow through the electric current of LED lamp bar by sampling resistor collection, and whether carry out voltage rising work according to the size control boost booster circuit of the electric current gathered, when the electric current flowing through LED lamp bar is less, then control boost booster circuit carries out boost operations, otherwise when the electric current flowing through LED lamp bar is larger, then control boost booster circuit stops boost operations.
Realizing in process of the present invention, the present inventor finds that in prior art, at least there are the following problems:
In prior art, liquid crystal TV set inside being provided with to two LED lamp bar needs Liang Ge drive circuit branch, each drive circuit branch is provided with and comprises boost booster circuit, diode, electrical energy inputs, LED drive chip and sampling resistor, use electronic devices and components are many, cause cost compare high.
Summary of the invention
The embodiment of the present invention provides a kind of drive circuit on the one hand, additionally provides a kind of liquid crystal TV set being provided with this drive circuit on the other hand, solves existing drive circuit and there are use electronic devices and components often, cause the technical problem that cost compare is high.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The drive circuit that the embodiment of the present invention provides, comprises electrical energy inputs, the first power consumption module, the second power consumption module and energy-storage module, wherein:
The voltage input end of described first power consumption module is connected with described electrical energy inputs;
Indirect first ground of the voltage output end of described first power consumption module and the voltage input end of described second power consumption module;
The voltage output end of described second power consumption module connects the second ground, and described first ground is not connected mutually with described second ground;
The two ends of described energy-storage module are connected with the voltage output end of described electrical energy inputs and the second power consumption module respectively;
Described energy-storage module, for storing the part electric energy inputted by described electrical energy inputs, and inputs to described first power consumption module, described second power consumption module successively, for described first power consumption module, described second power consumption module are powered.
Further, described energy-storage module is an electric capacity or two or more 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 two or more LED strip connection or the LED lamp bar that is formed in parallel;
And/or described first ground is the earth.
Further, this drive circuit, also comprises voltage transformation module, rectification module, control module and current sample module, wherein:
Described voltage transformation module, for inputing to described rectification module from external power source received current after being converted into the operating voltage of described first power consumption module and described second power consumption module;
Described rectification module, for being export alternating current rectification from described electrical energy inputs after direct current
Described control module, for being flow through the electric current of described first power consumption module and described second power consumption module by described current sample module acquires, and is controlled described voltage transformation module according to the size of described electric current gathered and whether carries out voltage conversion operation.
Further, described voltage transformation module is boost booster circuit;
And/or described current sample module is resistance, between the voltage output end that described resistance is connected to described first power consumption module and described first ground, or described resistance is connected between the voltage output end of described second power consumption module and described second ground.
And/or described rectification module is diode.
Further, described voltage transformation module comprises inductance, the first electric capacity and metal-oxide-semiconductor, wherein:
Wherein one end of described inductance is connected with the positive pole of the first external voltage input and described first electric capacity respectively, and the other end of described inductance is connected with the drain electrode of described metal-oxide-semiconductor and described electrical energy inputs;
The negative pole of described first electric capacity and the source electrode of described metal-oxide-semiconductor are all connected with described second ground;
The gate pole of described metal-oxide-semiconductor is connected with described control module;
Described control module, for launching the drive singal in order to control the whether conducting of described metal-oxide-semiconductor to the gate pole of described metal-oxide-semiconductor.
Further, described control module is LED drive chip, and described control module comprises driving pin, power pin, feedback pin and ground pin, wherein:
Described current sample model calling is 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 is connected with the gate pole of described metal-oxide-semiconductor, and described ground pin is connected with described second ground; Or, described current sample model calling is between the voltage output end and described first ground of described first power consumption module, described ground pin is connected 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 described driving pin and the gate pole of described metal-oxide-semiconductor, it is the gate pole inputting described metal-oxide-semiconductor after the safe voltage of described metal-oxide-semiconductor that described isolation module is used for the voltage transitions of described drive singal;
Described power pin is connected with the second external voltage input, for obtaining for the electric energy needed for described control module work from described second external voltage input;
Described control module, for being flow through the electric current of described first power consumption module and described second power consumption module by described feedback pin collection, and export drive singal for controlling the whether conducting of described metal-oxide-semiconductor according to the size of the described electric current gathered by described driving pin.
Further, described isolation module is optical coupler or transformer.
Further, described isolation module comprises transformer, NPN triode, PNP triode, the second electric capacity, the first resistance, the first diode and constant voltage input, wherein:
Described driving pin is connected with the base stage of described NPN triode and the base stage of described PNP triode respectively;
The collector electrode of described NPN triode is connected with described constant voltage input by described first resistance, and its emitter is connected with the emitter of described PNP triode and the current input terminal of described transformer respectively;
The collector electrode of described PNP triode is connected with the current output terminal of described transformer and described first ground respectively;
Wherein one end of described second electric capacity is connected with wherein one end of the secondary coil of described transformer, and the other end of described second electric capacity is connected with the gate pole of described metal-oxide-semiconductor;
The other end of the secondary coil of described transformer is connected with the source electrode of described metal-oxide-semiconductor, and this end is connected with the positive pole of described first diode, and the negative pole of described first diode is connected between described second electric capacity and the gate pole of described metal-oxide-semiconductor.
Further, this drive circuit, also comprises transformer, and described transformer comprises primary coil and secondary coil, and the secondary coil of described transformer comprises the first winding, the second winding and the tertiary winding; Wherein:
Wherein one end of described first winding is connected with the positive pole of the second diode, and described first external voltage input is the negative pole of described second diode;
Wherein one end of described second winding is connected with the positive pole of the 3rd diode, and described second external voltage input is the negative pole of described 3rd diode;
Wherein one end of the described tertiary winding is connected with the positive pole of the 4th diode, and the negative pole of described 4th diode is connected 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, work for controlling described control module, also for controlling the duty ratio of the described drive singal that described control module sends.
This liquid crystal TV set, comprise shell, be positioned at the drive circuit that the mainboard of shell and the invention described above embodiment provide, described shell is connected with the earth.
Compared with prior art, the embodiment of the present invention provide in above-mentioned arbitrary technical scheme and can produce at least following technique effect:
Due to the drive circuit that the embodiment of the present invention provides, the voltage input end of the first power consumption module is connected with electrical energy inputs, indirect first ground of the voltage output end of the first power consumption module and the voltage input end of the second power consumption module, the voltage output end of the second power consumption module connects the second ground, the two ends of energy-storage module are connected with the voltage output end of electrical energy inputs and the second power consumption module respectively, and energy-storage module can store the part electric energy inputted by electrical energy inputs, and input to the first power consumption module successively, second power consumption module, it is the first power consumption module, second power consumption module is powered, as can be seen here, first power consumption module and the second power consumption module constitute series circuit, the process that electric current flows through this series circuit is: first power consumption module → the first ground → the second power consumption module → the second ground → energy-storage module, in series circuit, electric current is consistent everywhere, so it is more balanced for flowing through the first power consumption module with the electric current of the second power consumption module,
Simultaneously, although the voltage between the voltage output end loading on electrical energy inputs and the second power consumption module is the first power consumption module, the operating voltage absolute value sum of the second power consumption module, but due to indirect first ground of the voltage output end of the first power consumption module and the voltage input end of the second power consumption module, and the current potential on ground is 0, so the voltage voltage namely loaded in the first power consumption module loaded between the first ground of connecing between the voltage output end of the first power consumption module and the first power consumption module and the voltage input end of the second power consumption module is not the first power consumption module, the operating voltage absolute value sum of the second power consumption module, but it is relevant to the resistance of the electric current and the first power consumption module that flow through the first power consumption module, if the electric current flowing through the first power consumption module is no more than the operating current of the first power consumption module, the voltage so loaded in the first power consumption module also can not more than the operating voltage of the first power consumption module, in like manner, namely voltage between the first ground that the voltage input end of the voltage output end and the second power consumption module that load on the first power consumption module connects and the second power consumption module load on voltage in the second power consumption module also not the first power consumption module, the operating voltage absolute value sum of the second power consumption module, but it is relevant to the resistance of the electric current and the first power consumption module that flow through the first power consumption module, if the electric current flowing through the first power consumption module is no more than the operating current of the first power consumption module, the voltage so loaded in the first power consumption module also can not more than the operating voltage of the first power consumption module, such as: when the first power consumption module and the second power consumption module are the identical LED lamp bar of power consumption, the voltage loaded in the first power consumption module be load on electrical energy inputs and the second power consumption module voltage output end between voltage 1/2, the voltage loaded in the second power consumption module is only-1/2 of the voltage between the voltage output end loading on electrical energy inputs and the second power consumption module, as can be seen here, when the electric current inputted by electrical energy inputs meets the first power consumption module, during the operating current of the second power consumption module, first power consumption module, the voltage that second power consumption module is born also can in the 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 the first power consumption module, when second power consumption module is LED lamp bar, an electrical energy inputs set by the embodiment of the present invention only needs connection power supply (such as boost booster circuit), the function achieved by existing drive circuit of powering for LED lamp bar can be realized,
Compared with prior art, because an electrical energy inputs set in the embodiment of the present invention only needs connection power supply (such as boost booster circuit), just can be that two LED lamp bar are powered simultaneously, and then save the required electronic devices and components adopted of power supply (such as boost booster circuit), electronic devices and components are fewer, cost also can be lower, so solve existing drive circuit to there are use electronic devices and components often, cause the technical problem that cost compare is high.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the internal structure schematic diagram of the drive circuit of powering for the LED lamp bar in liquid crystal TV set in prior art;
The in-built schematic diagram of the drive circuit that a kind of execution mode that Fig. 2 provides for the embodiment of the present invention 1 provides;
Fig. 3 is the dividing potential drop schematic diagram of the first power consumption module and the second power consumption module when being connected with the first ground between the first power consumption module with the second power consumption module in drive circuit shown in Fig. 2 and when not being connected with the first ground;
The in-built schematic diagram of the drive circuit that another execution mode that Fig. 4 is the embodiment of the present invention 1 provides;
The schematic diagram of the concrete implementing circuit of the drive circuit that Fig. 5 provides for the embodiment of the present invention 1 shown in Fig. 4;
The schematic diagram of the concrete implementing circuit of the drive circuit that Fig. 6 provides for the embodiment of the present invention 2;
Fig. 7 is the schematic diagram of the concrete implementing circuit of isolation module in Fig. 6.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not paying creative work, all belongs to the scope of protection of the invention.
Embodiments provide a kind of use electronic devices and components fewer, with low cost drive circuit and a kind of liquid crystal TV set being provided with this drive circuit.
Embodiment 1:
As shown in Figures 2 and 3, the drive circuit that the embodiment of the present invention provides, comprises drive circuit, comprises electrical energy inputs Uin, the first power consumption module 1, second power consumption module 2 and energy-storage module 3, wherein:
The voltage input end of the first power consumption module 1 is connected with electrical energy inputs Uin;
The indirect first ground GND1 of the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2;
The voltage output end of the second power consumption module 2 meets the second ground GND2, and the first ground GND1 is not connected mutually with the second ground GND2;
The two ends of energy-storage module 3 are connected with the voltage output end of electrical energy inputs Uin and the second power consumption module 2 respectively;
Energy-storage module 3, for storing the part electric energy inputted by electrical energy inputs Uin, and inputs to the first power consumption module 1, second power consumption module 2 successively, is that the first power consumption module 1, second power consumption module 2 is powered.
Due to the drive circuit that the embodiment of the present invention provides, the voltage input end of the first power consumption module 1 is connected with electrical energy inputs Uin, the indirect first ground GND1 of the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2, the voltage output end of the second power consumption module 2 meets the second ground GND2, the two ends of energy-storage module 3 are connected with the voltage output end of electrical energy inputs Uin and the second power consumption module 2 respectively, and energy-storage module 3 can store the part electric energy inputted by electrical energy inputs Uin, and input to the first power consumption module 1 successively, second power consumption module 2, it is the first power consumption module 1, second power consumption module 2 is powered, as can be seen here, first power consumption module 1 and the second power consumption module 2 constitute series circuit, the process that electric current flows through this series circuit is: first GND1 → the second power consumption module 2 → the second ground, power consumption module 1 → the first ground GND2 → energy-storage module 3, in series circuit, electric current is consistent everywhere, so it is more balanced for flowing through the first power consumption module 1 with the electric current of the second power consumption module 2,
Simultaneously, although the voltage between the voltage output end loading on electrical energy inputs Uin and the second power consumption module 2 is the first power consumption module 1, the operating voltage absolute value sum of the second power consumption module 2, but due to the indirect first ground GND1 of the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2, and the current potential on ground is 0, so the voltage voltage namely loaded in the first power consumption module 1 loaded between the first ground GND1 of connecing between the first power consumption module 1 and the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2 is not the first power consumption module 1, the operating voltage absolute value sum of the second power consumption module 2, but it is relevant to the resistance of the electric current and the first power consumption module 1 that flow through the first power consumption module 1, if the electric current flowing through the first power consumption module 1 is no more than the operating current of the first power consumption module 1, the voltage so loaded in the first power consumption module 1 also can not more than the operating voltage of the first power consumption module 1, in like manner, namely voltage between the first ground GND1 that the voltage input end of the voltage output end and the second power consumption module 2 that load on the first power consumption module 1 connects and the second power consumption module 2 load on voltage in the second power consumption module 2 also not the first power consumption module 1, the operating voltage absolute value sum of the second power consumption module 2, but it is relevant to the resistance of the electric current and the first power consumption module 1 that flow through the first power consumption module 1, if the electric current flowing through the first power consumption module 1 is no more than the operating current of the first power consumption module 1, the voltage so loaded in the first power consumption module 1 also can not more than the operating voltage of the first power consumption module 1, such as: when the first power consumption module 1 and the second power consumption module 2 are the identical LED lamp bar of power consumption, the voltage loaded in the first power consumption module 1 be load on electrical energy inputs Uin and the second power consumption module 2 voltage output end between voltage 1/2, the voltage loaded in the second power consumption module 2 is only-1/2 of the voltage between the voltage output end loading on electrical energy inputs Uin and the second power consumption module 2, as can be seen here, when the electric current inputted by electrical energy inputs Uin meets the first power consumption module 1, during the operating current of the second power consumption module 2, first power consumption module 1, the voltage that second power consumption module 2 is born also can in the first power consumption module 1, within the scope of the second power consumption module 2 operating voltage, first power consumption module 1, second power consumption module 2 can't be burnt, so when the first power consumption module 1, when second power consumption module 2 is LED lamp bar, an electrical energy inputs Uin set by the embodiment of the present invention only needs connection power supply (such as boost booster circuit), the function achieved by existing drive circuit of powering for LED lamp bar can be realized,
Compared with prior art, because an electrical energy inputs Uin set in the embodiment of the present invention only needs connection power supply (such as boost booster circuit), just can be that two LED lamp bar are powered simultaneously, and then save the required electronic devices and components adopted of power supply (such as boost booster circuit), electronic devices and components are fewer, cost also can be lower, so solve existing drive circuit to there are use electronic devices and components often, cause the technical problem that cost compare is high.
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 the second power consumption module 2 can be shorted and cannot normally work.
As shown in Figure 4 and Figure 5, in the present embodiment, energy-storage module 3 is an electric capacity or two or more capacitances in series or is formed in parallel;
And/or the power consumption of the first power consumption module 1 and the second power consumption module 2 is identical;
And/or the first power consumption module 1 and the second power consumption module 2 are a LED or are two or more LED strip connection or the LED lamp bar that is formed in parallel;
And/or the first ground GND1 is the earth.
Electric capacity has connection electric energy storage device simple, with low cost, is conducive to the cost reducing the drive circuit that the embodiment of the present invention provides.
As shown in Figure 3, the power consumption of the first power consumption module 1 and the second power consumption module 2 is identical, and when being LED lamp bar, if the first power consumption module 1 and the second power consumption module 2 are connected, and time unearthed between the first power consumption module 1 and the second power consumption module 2, voltage between the voltage output end of electrical energy inputs Uin to the second power consumption module 2 is 300V, and as the indirect first ground GND1 of the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2, the voltage loaded in the first power consumption module 1 be load on electrical energy inputs Uin and the second power consumption module 2 voltage output end between voltage 1/2, i.e. 150V, the voltage loaded in the second power consumption module 2 is only-1/2 i.e.-150V of voltage between the voltage output end loading on electrical energy inputs Uin and the second power consumption module 2, equal during the magnitude of voltage born due to two power consumption module, the size ratio of the voltage inputted by electrical energy inputs Uin is easier to control, power consumption module is not easily burnt because the voltage carried is excessive.
Certainly, in the present embodiment, the first power consumption module 1 and the second power consumption module 2 also can be other electronics power consuming devices outside LED lamp bar.
Because the periphery of the present embodiment first power consumption module 1 and the second power consumption module 2 also needs to connect other electronic devices and components, and many electronic devices and components (such as chip) need a reference voltage and can normally work, and the reference voltage of different electronic devices and components is also inconsistent, so when the first ground GND1 connect between the voltage output end of the first power consumption module 1 and the voltage input end of the second power consumption module 2 is different from the second ground GND2 that the voltage output end of the second power consumption module 2 connects, two kinds of reference voltages can be at least provided, and then the electronic devices and components of the periphery being connected to the first power consumption module 1 and the second power consumption module 2 can be avoided to interact.
First ground GND1 is preferably greatly.When first ground GND1 is preferably greatly, if when short circuit appears in the first power consumption module 1, electric current can flow directly into the earth, can not impact other electronic devices and components, so the fail safe of the circuit strengthened.
As shown in Figure 4 and Figure 5, drive circuit in the present embodiment, also comprises voltage transformation module 4, rectification module 5, control module 6 and current sample module 7, wherein:
Voltage transformation module 4, for inputing to rectification module 5 from external power source received current after being converted into the operating voltage of the first power consumption module 1 and the second power consumption module 2;
Rectification module 5, for being export alternating current rectification from electrical energy inputs Uin after direct current
Whether control module 6, for being flow through the electric current of the first power consumption module 1 and the second power consumption module 2 by current sample module 7 collection, and carry out voltage conversion operation according to the size control voltage modular converter 4 of the electric current gathered.
Low voltage transition can be both high voltage by voltage transformation module 4, also high voltage can be converted to low-voltage, specifically how change the height of the voltage depending on the electric current that external power source exports.
The direct current that rectification module 5 exports, can ensure that LED lamp bar continues, stablize and light.
When the electric current flowing through the first power consumption module 1 and the second power consumption module 2 that control module 6 is gathered by current sample module 7 smaller or larger time, then can control voltage transformation module 4 and carry out voltage conversion operation, the voltage that voltage transformation module 4 is exported increases or reduces, like this, just its size of current exported can be adjusted by the mode of adjustment voltage transformation module 4 output voltage.
As shown in Figure 4 and Figure 5, in the present embodiment, voltage transformation module 4 is boost booster circuit;
And/or current sample module 7 is resistance, between the voltage output end that resistance is connected to the first power consumption module 1 and the first ground GND1, or resistance is connected between the voltage output end of the second power consumption module 2 and the second ground GND2.
And/or rectification module 5 is diode.
Boost booster circuit is not only with low cost, and is convenient to control.Diode has with low cost, that attended operation is fairly simple advantage.
When current sample module 7 is resistance, and resistance value one timing, there is electric current through resistance, ohmically voltage is also certain, like this, by detecting the voltage in current sample module 7, the situation of the electric current flowing through the first power consumption module 1 and the second power consumption module 2 can just be detected.
In the present embodiment, voltage transformation module 4 comprises inductance L, the first electric capacity C1 and metal-oxide-semiconductor Q, wherein:
Wherein one end of inductance L is connected with the positive pole of the first external voltage input and the first electric capacity C1 respectively, and the other end of inductance L is connected with the drain electrode of metal-oxide-semiconductor Q and electrical energy inputs Uin;
The negative pole of the first electric capacity C1 and the source electrode of metal-oxide-semiconductor Q are all connected with the second ground GND2;
The gate pole of metal-oxide-semiconductor Q is connected with control module 6;
Control module 6, for launching the drive singal in order to control metal-oxide-semiconductor Q whether conducting to the gate pole of metal-oxide-semiconductor Q.
When metal-oxide-semiconductor Q ends, inductance L storaging current, the voltage of input electrical energy inputs Uin raises, otherwise during metal-oxide-semiconductor Q conducting, inductance L release current, the voltage of input electrical energy inputs Uin reduces.
First electric capacity C1 can play the effect of storaging current and filtering, ensures that the current ratio inputing to inductance L comparatively continues, stablizes.
In the present embodiment, control module 6 is LED drive chip, and control module 6 comprises driving pin Dri, power pin Vcc, feedback pin Cs and ground pin GND, wherein:
Current sample module 7 is connected between the voltage output end of the second power consumption module 2 and the second ground GND2;
Feedback pin Cs is connected between current sample module 7 and the voltage input end of the second power consumption module 2;
Pin Dri is driven to be connected with the gate pole of metal-oxide-semiconductor Q;
Ground pin GND is connected with the second ground GND2;
Power pin Vcc is connected with the second external voltage input, for the required electric energy that works from the second external voltage input acquisition confession control module 6;
Control module 6, flows through the electric current of the first power consumption module 1 and the second power consumption module 2 for being gathered by feedback pin Cs, and exports drive singal for controlling metal-oxide-semiconductor Q whether conducting according to the size of the electric current gathered by driving pin Dri.
Because the source electrode of metal-oxide-semiconductor Q is connected with the second ground GND2, the ground pin GND of control module 6 is also connected with the second ground GND2, so now the reference voltage of metal-oxide-semiconductor Q and the reference voltage of control module 6 are consistent, control module 6 safe voltage that usually can not exceed metal-oxide-semiconductor Q for the drive singal controlling metal-oxide-semiconductor Q whether conducting by driving pin Dri to export, so metal-oxide-semiconductor Q can not be burnt out, and then ensure that the reliability of the present embodiment drive circuit.
Drive 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 the first winding, the second winding and the tertiary winding, wherein:
Wherein one end of first winding is connected with the positive pole of the second diode VD2, and the first external voltage input is the negative pole of the second diode VD2;
Wherein one end of second winding is connected with the positive pole of the 3rd diode VD3, and the second external voltage input is the negative pole of the 3rd diode VD3;
Wherein one end of the tertiary winding is connected with the positive pole of the 4th diode VD4, and the negative pole of the 4th diode VD4 is connected 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, work, also for controlling the duty ratio of the drive singal that control module 6 sends for controlling control module 6.
Three power digital circuits that three windings are respectively different are powered, and can not interact each other.
Mainboard due to liquid crystal TV set usually can control control module 6 by the mode sending enable signal and SW signal and enters operating state or quit work; control the duty ratio of control module 6 from the drive singal driving pin Dri to send by the mode sending dim signal and pwm signal, and then regulate the brightness of LED lamp bar by the mode of adjustment drive singal duty ratio.
Embodiment 2:
As shown in Fig. 4, Fig. 6 and Fig. 7, the present embodiment is substantially the same manner as Example 1, and its difference is: between the voltage output end that in the present embodiment, current sample module 7 is connected to the first power consumption module 1 and the first ground GND1;
Ground pin GND is connected with the first ground GND1;
Feedback pin Cs is connected between current sample module 7 and the voltage output end of the first power consumption module 1;
Drive between pin Dri and the gate pole of metal-oxide-semiconductor Q and be also connected with isolation module T2;
Isolation module T2, for by the voltage transitions of drive singal be metal-oxide-semiconductor Q safe voltage after input the gate pole of metal-oxide-semiconductor Q.
Because the ground pin GND of control module in the present embodiment 6 is connected with the first ground GND1, and the collector electrode of metal-oxide-semiconductor Q is connected with the second ground GND2, the ground connect due to control module 6 is different from the ground that metal-oxide-semiconductor Q connects, so its reference voltage is not identical yet, so very easily occur that the thing causing metal-oxide-semiconductor Q to burn because of the drive singal overtension of control module 6 output occurs, so increase isolation module T2 in the present embodiment, it by isolation module T2 is the gate pole inputting metal-oxide-semiconductor Q after the safe voltage of metal-oxide-semiconductor Q by the voltage transitions of drive singal, thus avoid drive singal overtension and metal-oxide-semiconductor Q is burnt.
In the present embodiment, isolation module T2 is optical coupler or transformer.Optical coupler or transformer all can play the effect of voltage of transformation, thus reduce the voltage of the drive singal that control module 6 exports, and prevent metal-oxide-semiconductor Q from burning.Coupler or transformer have and connect easily, and the advantage of with low cost, dependable performance, is suitable for being applied in the embodiment of the present invention.
As shown in Figure 6 and Figure 7, in the present embodiment, isolation module T2 comprises transformer T20, NPN triode V1, PNP triode V2, the second electric capacity, the first resistance R1, the first diode VD1 and constant voltage input V0, wherein:
Pin Dri is driven to be connected with the base stage of NPN triode V1 and the base stage of PNP triode V2 respectively;
The collector electrode of NPN triode V1 is connected with constant voltage input V0 by the first resistance R1, and its emitter is connected with the emitter of PNP triode V2 and the current input terminal of transformer T20 primary coil respectively;
The collector electrode of PNP triode V2 is connected with the current output terminal of transformer T20 primary coil and the first ground GND1 respectively;
Wherein one end of second electric capacity is connected with wherein one end of the secondary coil of transformer T20, and the other end of the second electric capacity is connected with the gate pole of metal-oxide-semiconductor Q;
The other end of the secondary coil of transformer T20 is connected with the source electrode of metal-oxide-semiconductor Q, and this end is connected with the positive pole of the first diode VD1, and the negative pole of the first diode VD1 is connected between the gate pole of the second electric capacity and metal-oxide-semiconductor Q.
NPN triode V1 plays the effect of Current amplifier, can amplify the electric current of drive singal, thus strengthens the driving force of drive singal, and the conducting of metal-oxide-semiconductor Q and the speed of cut-off are accelerated.PNP triode V2 can drive singal input positive current before, the negative current of the remnants in transformer T20 primary coil is accessed the first ground GND1, thus avoids residual negative current on the impact of metal-oxide-semiconductor Q, the conducting of metal-oxide-semiconductor Q and the speed of cut-off are accelerated.
The secondary coil of transformer T20, the second electric capacity and the first diode VD1 can form a loop, the negative current that transformer T20 is exported also can flow into the second electric capacity, thus negative current is released, avoid negative current on the impact of circuit, when making the secondary coil of transformer T20 export positive current, can act on fast on metal-oxide-semiconductor Q.
As shown in Figure 3, the liquid crystal TV set that the embodiment of the present invention provides, comprise shell 9, be positioned at the drive circuit that the mainboard of shell 9 and the invention described above embodiment provide, shell 9 is connected with the earth.
The liquid crystal TV set provided due to the embodiment of the present invention has the technical characteristic identical with the drive circuit that the invention described above embodiment provides, so also can produce identical technique effect, solve identical technical problem, no longer repeats to set forth herein.
Shell 9 is connected with the earth, can electronic devices and components generation overvoltage in shell 9 or short circuit time, play the effect of protection.Electronic devices and components in the present embodiment housing 9 can be connected with the earth by the screw be fixed on the screw hole 8 of shell 9.
Certainly, the drive circuit that in the present embodiment, the invention described above embodiment provides also can be applied on other electronic equipments outside liquid crystal TV set, and the first power consumption module 1 and the second power consumption module 2 also can be other power consuming devices outside LED lamp bar as shown in Figure 2.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a drive circuit, is characterized in that, comprises electrical energy inputs, the first power consumption module, the second power consumption module and energy-storage module, wherein:
Described drive circuit is applied to liquid crystal TV set, and described first power consumption module, the second power consumption module are the LED lamp bar in described liquid crystal TV set;
The voltage input end of described first power consumption module is connected with described electrical energy inputs;
Indirect first ground of the voltage output end of described first power consumption module and the voltage input end of described second power consumption module;
The voltage output end of described second power consumption module connects the second ground, and described first ground is not connected mutually with described second ground;
The two ends of described energy-storage module are connected with the voltage output end of described electrical energy inputs and the second power consumption module respectively;
Described energy-storage module, for storing the part electric energy inputted by described electrical energy inputs, and inputs to described first power consumption module, described second power consumption module successively, for described first power consumption module, described second power consumption module are powered.
2. drive circuit according to claim 1, is characterized in that, described energy-storage module is an electric capacity or two or more 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 two or more LED strip connection or the LED lamp bar that is formed in parallel;
And/or described first ground is the earth.
3. drive circuit according to claim 2, is characterized in that, this drive circuit, also comprises voltage transformation module, rectification module, control module and current sample module, wherein:
Described voltage transformation module, for inputing to described rectification module from external power source received current after being converted into the operating voltage of described first power consumption module and described second power consumption module;
Described rectification module, for being export alternating current rectification from described electrical energy inputs after direct current;
Described control module, for being flow through the electric current of described first power consumption module and described second power consumption module by described current sample module acquires, and is controlled described voltage transformation module according to the size of described electric current gathered and whether carries out voltage conversion operation.
4. drive circuit according to claim 3, is characterized in that, described voltage transformation module is boost booster circuit;
And/or described current sample module is resistance, between the voltage output end that described resistance is connected to described first power consumption module and described first ground, or described resistance is connected between the voltage output end of described second power consumption module and described second ground;
And/or described rectification module is diode.
5. drive circuit according to claim 4, is characterized in that, described voltage transformation module comprises inductance, the first electric capacity and metal-oxide-semiconductor, wherein:
Wherein one end of described inductance is connected with the positive pole of the first external voltage input and described first electric capacity respectively, and the other end of described inductance is connected with the drain electrode of described metal-oxide-semiconductor and described electrical energy inputs;
The negative pole of described first electric capacity and the source electrode of described metal-oxide-semiconductor are all connected with described second ground;
The gate pole of described metal-oxide-semiconductor is connected with described control module;
Described control module, for launching the drive singal in order to control the whether conducting of described metal-oxide-semiconductor to the gate pole of described metal-oxide-semiconductor.
6. drive circuit according to claim 5, is characterized in that, described control module is LED drive chip, and described control module comprises driving pin, power pin, feedback pin and ground pin, wherein:
Described current sample model calling is 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 is connected with the gate pole of described metal-oxide-semiconductor, and described ground pin is connected with described second ground; Or, described current sample model calling is between the voltage output end and described first ground of described first power consumption module, described ground pin is connected 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 described driving pin and the gate pole of described metal-oxide-semiconductor, it is the gate pole inputting described metal-oxide-semiconductor after the safe voltage of described metal-oxide-semiconductor that described isolation module is used for the voltage transitions of described drive singal;
Described power pin is connected with the second external voltage input, for obtaining for the electric energy needed for described control module work from described second external voltage input;
Described control module, for being flow through the electric current of described first power consumption module and described second power consumption module by described feedback pin collection, and export drive singal for controlling the whether conducting of described metal-oxide-semiconductor according to the size of the described electric current gathered by described driving pin.
7. drive circuit according to claim 6, is characterized in that, described isolation module is optical coupler or transformer.
8. drive circuit according to claim 6, is characterized in that, described isolation module comprises transformer, NPN triode, PNP triode, the second electric capacity, the first resistance, the first diode and constant voltage input, wherein:
Described driving pin is connected with the base stage of described NPN triode and the base stage of described PNP triode respectively;
The collector electrode of described NPN triode is connected with described constant voltage input by described first resistance, and its emitter is connected with the emitter of described PNP triode and the current input terminal of described transformer respectively;
The collector electrode of described PNP triode is connected with the current output terminal of described transformer and described first ground respectively;
Wherein one end of described second electric capacity is connected with wherein one end of the secondary coil of described transformer, and the other end of described second electric capacity is connected with the gate pole of described metal-oxide-semiconductor;
The other end of the secondary coil of described transformer is connected with the source electrode of described metal-oxide-semiconductor, and this end is connected with the positive pole of described first diode, and the negative pole of described first diode is connected between described second electric capacity and the gate pole of described metal-oxide-semiconductor.
9. drive circuit according to claim 6, is characterized in that, this drive circuit, also comprises transformer, and described transformer comprises primary coil and secondary coil, and the secondary coil of described transformer comprises the first winding, the second winding and the tertiary winding; Wherein:
Wherein one end of described first winding is connected with the positive pole of the second diode, and described first external voltage input is the negative pole of described second diode;
Wherein one end of described second winding is connected with the positive pole of the 3rd diode, and described second external voltage input is the negative pole of described 3rd diode;
Wherein one end of the described tertiary winding is connected with the positive pole of the 4th diode, and the negative pole of described 4th diode is connected 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, work for controlling described control module, also for controlling the duty ratio of the described drive singal that described control module sends.
10. a liquid crystal TV set, is characterized in that, comprise shell, be positioned at the mainboard of shell and the arbitrary described drive circuit of claim 1 to 9, described shell is connected with the earth.
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| CN201110096857.4A CN102750913B (en) | 2011-04-18 | 2011-04-18 | Driving circuit and liquid crystal television |
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| CN201110096857.4A CN102750913B (en) | 2011-04-18 | 2011-04-18 | Driving circuit and liquid crystal television |
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| CN102750913B true CN102750913B (en) | 2015-04-29 |
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| KR102617195B1 (en) * | 2016-05-09 | 2023-12-27 | 삼성디스플레이 주식회사 | Display device |
| CN106097986A (en) * | 2016-08-23 | 2016-11-09 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit |
| WO2023109168A1 (en) * | 2021-12-14 | 2023-06-22 | 海信视像科技股份有限公司 | Display device and display control method |
Citations (3)
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|---|---|---|---|---|
| CN101325045A (en) * | 2007-06-12 | 2008-12-17 | 精工爱普生株式会社 | Semiconductor integrated circuit, power source system interface, and electronic apparatus |
| CN101605416A (en) * | 2008-06-13 | 2009-12-16 | 登丰微电子股份有限公司 | LED driving circuit and controller thereof |
| CN101944331A (en) * | 2010-09-15 | 2011-01-12 | 深圳创维－Rgb电子有限公司 | TV set and backlight control circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100361369C (en) * | 2004-06-22 | 2008-01-09 | 宁波兰尔达通信设备有限公司 | An intelligent charging circuit |
| TW200944702A (en) * | 2008-02-06 | 2009-11-01 | Microsemi Corp | Single LED string lighting |
| CN201994046U (en) * | 2011-04-18 | 2011-09-28 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325045A (en) * | 2007-06-12 | 2008-12-17 | 精工爱普生株式会社 | Semiconductor integrated circuit, power source system interface, and electronic apparatus |
| CN101605416A (en) * | 2008-06-13 | 2009-12-16 | 登丰微电子股份有限公司 | LED driving circuit and controller thereof |
| CN101944331A (en) * | 2010-09-15 | 2011-01-12 | 深圳创维－Rgb电子有限公司 | TV set and backlight control circuit thereof |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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