CN201994045U - Driving circuit and liquid crystal television - Google Patents
Driving circuit and liquid crystal television Download PDFInfo
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- CN201994045U CN201994045U CN201120106004XU CN201120106004U CN201994045U CN 201994045 U CN201994045 U CN 201994045U CN 201120106004X U CN201120106004X U CN 201120106004XU CN 201120106004 U CN201120106004 U CN 201120106004U CN 201994045 U CN201994045 U CN 201994045U
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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 that the cost of electronic equipment for installing the driving circuit is high in the prior art. The driving circuit comprises a voltage input end, a coupling module and a rectifying module, wherein the coupling module is connected with the voltage input end, the rectifying module is connected with the coupling module, the coupling module is used for receiving current conforming to the total work voltage of two power consumption modules from the voltage input end and converting the current into the current conforming to the work voltage of one power consumption module, and the rectifying module is used for respectively inputting the current conforming to the work voltage of one power consumption module to the two serially connected power consumption modules for supplying electricity for the power consumption modules. The liquid crystal television comprises the two power consumption modules and the driving circuit of the embodiment of the utility model. The driving circuit is used for supplying electricity for the power consumption modules, and each power consumption module is a path of light emitting diode (LED) lamp strips or is formed by connecting more than two paths of LED lamp strips in series. The driving circuit and the liquid crystal television are used for reducing the cost of the driving circuit.
Description
Technical field
The present invention 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 is the driving circuit of LED lamp bar power supply, comprises external power source input end U, boost module 40, control module N, rectification module 20, filtration module Co, current sampling module 5 and light-adjusting module 7, wherein:
Filtration module Co is used to store the electric current of boost module 40 inputs, and discharges gradually and input to LED lamp bar;
Light-adjusting module 7 is used to receive dim signal and the enabling signal that the external circuitry plate is imported, and with its input control module N;
Control module N, enter duty after being used to receive enabling signal, and after entering duty, cross the size of the electric current of LED lamp bar, and be adjusted into and the corresponding electric current of dim signal according to the electric current that inputs to rectification module 20 of dim signal with boost module 40 by current sampling module 5 induced flows.
Type of drive used in the prior art is a boost module 40 corresponding paths of LEDs lamp bars that drive, promptly to need a boost module 40, rectification module 20, a filtration module Co and driving circuit that a current sampling module 5 constituted be its power supply to a street lamp bar, when adopting this mode, if when needing to drive two paths of LED lamp bar, then need two boost modules 40, two rectification modules 20, two filtration module Co and driving circuit that two current sampling module 5 constituted to be its power supply, and control module N also need a plurality of chips to constitute.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In the prior art, only be provided with the electronic equipment of two street lamp bars for inside, when adopting existing driving circuit to be used to the two street lamp bars power supply of its inside, need to use two as shown in Figure 1 boost module 40 could realize, the electron device that boost module 40 is adopted is relatively more expensive usually, causes being provided with the electronic equipment cost of this driving circuit than higher.
Summary of the invention
The embodiment of the invention provides a kind of driving circuit on the one hand, and a kind of liquid crystal TV set that is provided with this driving circuit also is provided on the other hand, has solved prior art and has existed the electronic equipment cost that driving circuit is set to compare technical problems of high.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The driving circuit that the embodiment of the invention provided, voltage input end, the coupling module that links to each other with described voltage input end and the rectification module that links to each other with described coupling module, wherein:
Described coupling module is used for receiving the electric current that meets the total operating voltage of two power consumption module from described voltage input end, and is converted into the electric current that meets a described power consumption module operating voltage;
Described rectification module, being used for meeting the electric current of a described power consumption module operating voltage, input to respectively two described power consumption module that are cascaded is described power consumption module power supply.
Further, described coupling module is at least one electric capacity or be two above capacitances in series or be formed in parallel;
And/or the power of two described power consumption module is identical;
And/or each described power consumption module is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar;
And/or described rectification module comprises rectification unit and energy-storage units, wherein:
Described rectification unit, the electric current that is used for meeting a described power consumption module operating voltage inputs to described energy-storage units;
Described energy-storage units is used to receive and store the electric current of described rectification unit input, and inputs to two described power consumption module respectively.
Further, described coupling module is a polarity free capacitor; And/or described rectification unit comprises first diode and second diode, and described energy-storage units comprises first electric capacity and second electric capacity, and two described power consumption module comprise first power consumption module and second power consumption module, wherein:
The positive pole of described first diode links to each other with described coupling module, and its negative pole links to each other with the current input terminal of described first power consumption module, and the current output terminal of this described power consumption module in road links to each other with the current input terminal and the ground of described second power consumption module respectively;
The negative pole of described second diode links to each other with described coupling module, and its positive pole links to each other with the current output terminal of described second power consumption module;
The current input terminal that the two poles of the earth of described first electric capacity are connected in described first power consumption module with and current output terminal between;
The current input terminal that the two poles of the earth of described second electric capacity are connected in described second power consumption module with and current output terminal between and between the current output terminal.
Further, described coupling module, described first electric capacity and/or described second electric capacity are polypropylene capactive.
Further, this driving circuit also comprises voltage transformation module, control module and current sampling module, wherein:
Described voltage transformation module links to each other with described control module, described coupling module respectively, and described current sampling module links to each other with the current output terminal of described control module and described first power consumption module respectively;
Described voltage transformation module, be used for from the current output terminal received current of extraneous power supply and be translated into the electric current that meets the total operating voltage of two described power consumption module after the described coupling module of input;
Described control module is used for responding to by described current sampling module the current value of the current output terminal of described first power consumption module, and the electric current that described voltage transformation module is exported is described power consumption module working current.
Further, described voltage transformation module is the Boost booster circuit; And/or described control module is a control chip; And/or described current sampling module comprises first triode, first resistance and second resistance, wherein:
Described first resistance is connected between the current output terminal and ground of described first power consumption module;
The base stage of described first triode is connected between the current output terminal and first resistance of described first power consumption module by described second resistance;
The grounded emitter of described first triode, and its collector links to each other with described control module;
Described control module is used for responding to by the collector of described first triode current value and/or the magnitude of voltage of the current output terminal of described first power consumption module.
Further, this driving circuit also comprises the protection module that links to each other with described control module, wherein:
Described protection module is used for when described power consumption module open circuit, overcurrent or short circuit, described control module is sent the fault-signal of high-low level form;
Described control module also is used for after receiving described fault-signal, controls described voltage transformation module and quits work.
Further, described voltage transformation module comprises boost inductance, metal-oxide-semiconductor and the 4th resistance, and described protection module comprises NPN triode, PNP triode, storage capacitor, the 5th resistance, the 6th resistance and voltage stabilizing diode, wherein:
The current input terminal of described boost inductance links to each other with the current output terminal of described extraneous power supply, and the current output terminal of described boost inductance links to each other with the drain electrode and the described voltage input end of described metal-oxide-semiconductor respectively;
The source electrode of described metal-oxide-semiconductor is by described the 4th resistance eutral grounding, and the gate pole of described metal-oxide-semiconductor links to each other with described control module;
The anode of described voltage stabilizing diode links to each other with described voltage input end, and the negative electrode of described voltage stabilizing diode is by described storage capacitor ground connection;
Described storage capacitor and described the 5th resistance of connecting and the 6th resistance parallel connection;
The negative electrode of described voltage stabilizing diode is connected between described the 5th resistance and described the 6th resistance;
The anode of described voltage stabilizing diode links to each other with the base stage of the source electrode of described metal-oxide-semiconductor, described control module, described NPN triode, the emitter of described PNP triode respectively;
The grounded emitter of described NPN triode, its collector links to each other with the base stage of described PNP triode;
The collector of described PNP triode links to each other with described control module, and its emitter links to each other with constant voltage source, and described fault-signal is the voltage signal of described constant voltage source output.
Further, described control module comprises control module and the feedback pin that links to each other with described control module, starts pin, protects pin, drives pin and power pin, wherein:
Described feedback pin links to each other with the collector of described first triode;
Described startup pin links to each other with enabling signal input end, the dim signal input end of the external circuit board respectively;
Described protection pin links to each other with the anode of the source electrode of described metal-oxide-semiconductor, described voltage stabilizing diode, the emitter of described PNP triode respectively;
Described driving pin links to each other with the gate pole of described metal-oxide-semiconductor;
Described power pin links to each other with described extraneous source current output terminal, is used for obtaining electric current from described extraneous power supply;
Described control module is used for the enabling signal that received according to described enabling signal input end, starts or stops work by sending the mode of the control signal of high-low level form to control described voltage transformation module to described driving tube human hair combing waste;
Described control module, be used for the dim signal that received according to described dim signal input end, by changing the mode of dutycycle of described driving tube human hair combing waste being sent the control signal of high-low level form, control the frequency that described voltage transformation module starts or stops work;
Described control module is used for receiving after the described fault-signal by described protection pin, controls described voltage transformation module and quits work.
The liquid crystal TV set that the embodiment of the invention provided, comprise two power consumption module and the described driving circuit of the invention described above embodiment, described driving circuit is used to described power consumption module power supply, and each described power consumption module is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar.
Compared with prior art, the embodiment of the invention provides and can produce following at least technique effect in above-mentioned arbitrary technical scheme:
Because in the liquid crystal TV set that the embodiment of the invention provided, coupling module can receive the electric current meet the total operating voltage of two power consumption module from voltage input end, and be converted into the electric current that meets a power consumption module (a for example paths of LEDs lamp bar) operating voltage, and rectification module can will meet the electric current of a power consumption module operating voltage, inputing to two power consumption module that are cascaded respectively is the power consumption module power supply, so only needing to connect a boost module, voltage input end just can be used to two power consumption module (for example two paths of LED lamp bar) power supply, thereby two-way is the technique effect that the driving circuit of LED lamp bar power supply just can reach in the realization prior art, compared with prior art, embodiment of the invention driving circuit has been saved a boost module, and owing to saved a boost module, so with supporting other peripheral circuits of boost module also can be more simple;
Simultaneously, the cost of electronic devices and components that can be used to constitute coupling module that the embodiment of the invention adopts and rectification module usually is far below the cost of the electronic devices and components that constitute a boost module, can exist the electronic equipment cost that driving circuit is set to compare technical problems of high so solved prior art for the cost of the driving circuit of two paths of LED lamp bar power supply cost so the embodiment of the invention provides far below existing driving circuit for the power supply of two paths of LED lamp bar.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention 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 some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The driving circuit that provided in the prior art and the synoptic diagram of the annexation between the LED lamp bar are provided Fig. 1;
A kind of embodiment of the driving circuit that Fig. 2 provides for the embodiment of the invention and the synoptic diagram of the annexation between the power consumption module;
The another kind of embodiment of the driving circuit that Fig. 3 provides for the embodiment of the invention and the synoptic diagram of the annexation between the power consumption module;
Fig. 4 is the concrete enforcement circuit of the driving circuit that the preferred embodiments of the present invention provided and the synoptic diagram of the annexation between the power consumption module;
Fig. 5 is the synoptic diagram of the annexation between control module and the constant voltage input end in the driving circuit shown in Figure 4.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not paying creative work belongs to the scope of protection of the invention.
The embodiment of the invention provides a kind of driving circuit and a kind of liquid crystal TV set that is provided with this driving circuit that components and parts are few, cost is lower that use.
As Fig. 2, Fig. 3 and shown in Figure 4, the driving circuit that the embodiment of the invention provided comprises voltage input end Uin, the coupling module 1 that links to each other with voltage input end Uin and the rectification module 2 that links to each other with coupling module 1, wherein:
Because in the liquid crystal TV set that the embodiment of the invention provided, coupling module 1 can receive the electric current meet the total operating voltage of two power consumption module 3 from voltage input end Uin, and be converted into the electric current that meets a power consumption module 3 (a for example paths of LEDs lamp bar) operating voltage, and rectification module 2 can will meet the electric current of power consumption module 3 operating voltage, input to two power consumption module 3 that are cascaded respectively and be power consumption module 3 power supplies, so only needing to connect a boost module, voltage input end Uin just can be used to two power consumption module 3 (for example two paths of LED lamp bar) power supply, thereby two-way is the technique effect that the driving circuit of LED lamp bar power supply just can reach in the realization prior art, compared with prior art, embodiment of the invention driving circuit has been saved a boost module, and owing to saved a boost module, so with supporting other peripheral circuits of boost module also can be more simple;
Simultaneously, the cost of electronic devices and components that can be used to constitute coupling module 1 that the embodiment of the invention adopts and rectification module 2 usually is far below the cost of the electronic devices and components that constitute a boost module, can exist the electronic equipment cost that driving circuit is set to compare technical problems of high so solved prior art for the cost of the driving circuit of two paths of LED lamp bar power supply cost so the embodiment of the invention provides far below existing driving circuit for the power supply of two paths of LED lamp bar.
As shown in Figure 3, in the present embodiment coupling module 1 at least one electric capacity or be two above capacitances in series or be formed in parallel;
And/or each power consumption module 3 is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar;
And/or rectification module 2 comprises rectification unit VD and energy-storage units C, wherein:
Rectification unit VD, the electric current that is used for meeting power consumption module 3 operating voltage inputs to energy-storage units C;
Energy-storage units C is used to receive and store the electric current of rectification unit VD input, and inputs to two power consumption module 3 respectively.
Electric capacity is electronic devices and components with low cost, no matter be the coupling module 1 that an electric capacity constitutes, or a plurality of capacitances in series or the coupling module 1 that is formed in parallel all can play storaging current, and output voltage values is half electric current of input voltage value, to guarantee that a power consumption module 3 can operate as normal.
Energy-storage units C can guarantee that power consumption module 3 has more constant and lasting power supply supply, thereby makes power consumption module 3 can keep more constant, stable duty.
The positive pole of the first diode VD1 links to each other with coupling module 1, and its negative pole links to each other with the current input terminal of first power consumption module 31, and the current output terminal of this road power consumption module 3 links to each other with the current input terminal and the ground of second power consumption module 32 respectively;
The negative pole of the second diode VD2 links to each other with coupling module 1, and its positive pole links to each other with the current output terminal of second power consumption module 32;
The current input terminal that the two poles of the earth of first capacitor C 1 are connected in first power consumption module 31 with and current output terminal between;
The current input terminal that the two poles of the earth of second capacitor C 2 are connected in second power consumption module 32 with and current output terminal between and between the current output terminal.
When polarity free capacitor is connected with other electronic devices and components, need not to consider the problem of electric capacity closure, attended operation is more convenient.Diode is a kind of technology maturation, with low cost, and the electronic devices and components that connect easily, and it is low that the rectification unit VD that is made of diode has a cost, the advantage of dependable performance.
In the said structure, first power consumption module 31 and second power consumption module 32 have formed a closed-loop path with coupling module 1, so first power consumption module 31 and second power consumption module 32 have formed the electrical connection of mutual series connection.First capacitor C 1 can guarantee that first power consumption module 31 has more constant and lasting power supply supply, and second capacitor C 2 can guarantee that second power consumption module 32 has more constant and lasting power supply supply.
Polypropylene capactive be with metal forming as electrode, with itself and polypropylene film from two ends overlapping after, be wound into the capacitor of structure cylindraceous, have nonpolarityly, insulation impedance is very high, the frequency characteristic excellence, frequency response broadness and dielectric loss are very little.Certainly, coupling module 1, first capacitor C 1 and/or second capacitor C 2 also can be other electric capacity outside the polypropylene capactive in the present embodiment.
Driving circuit in the present embodiment also comprises voltage transformation module 4, control module N and current sampling module 5, wherein:
Voltage transformation module 4 links to each other with control module N, coupling module 1 respectively, and current sampling module 5 links to each other with the current output terminal of the control module N and first power consumption module 31 respectively;
Voltage transformation module 4, be used for from the current output terminal received current of extraneous power supply and be translated into the electric current that meets the total operating voltage of two power consumption module 3 after input coupling module 1;
Control module N be used for the current value by the current output terminal of current sampling module 5 inductions first power consumption module 31, and the electric current that voltage transformation module 4 is exported is power consumption module 3 working currents.
When from the voltage ratio of the electric current that current output terminal received of extraneous power supply when low, voltage transformation module 4 need be increased to the voltage of electric current and meet the total operating voltage of two power consumption module 3, play boost module identical functions in the prior art, otherwise, then when from the voltage ratio of the current output terminal received current of extraneous power supply when higher, voltage transformation module 4 need be low to moderate the voltage drop of electric current and meets the total operating voltage of two power consumption module 3.
Control module N is by the current value of the current output terminal of current sampling module 5 inductions first power consumption module 31, and judge according to the current value of being responded to whether the electric current of voltage transformation module 4 output meets the working current of power consumption module 3, if do not meet, then need in real time voltage transformation module 4 to be adjusted, adjust the size of the current value of its output by the mode of adjusting voltage transformation module 4 output voltages.
As shown in Figure 4, voltage transformation module 4 is the Boost booster circuit in the present embodiment; And/or control module N is the NCP family chip; And/or current sampling module 5 comprises the first triode V1, first resistance R 1 and second resistance R 2, wherein:
The base stage of the first triode V1 is connected between the current output terminal and first resistance R 1 of first power consumption module 31 by second resistance R 2;
The grounded emitter of the first triode V1, and its collector links to each other with control module N;
Control module N is used for responding to by the collector of the first triode V1 current value and/or the magnitude of voltage of the current output terminal of first power consumption module 31.
By metal-oxide-semiconductor V in the control Boost booster circuit is the height that conducting or the mode of ending can be controlled the magnitude of voltage of Boost booster circuit output voltage, during metal-oxide-semiconductor V conducting, output again after the Boost booster circuit boosts to the electric current of importing, when metal-oxide-semiconductor V ended, booster circuit quit work.
It is low that the NCP family chip has a cost, the advantage of stable performance, and certainly, control module N also can use other chips outside the NCP family chip in the present embodiment.
Control module N is preferably the current value of responding to the current output terminal of first power consumption module 31 by the collector of the first triode V1 in the present embodiment, at this moment, the resistance of pre-set first resistance R 1, when the current value of the current output terminal of first power consumption module 31 increases to when being enough to the conducting first triode V1, control module N adjusts voltage transformation module 4 in real time, turn down the current value of the electric current that flows through first power consumption module 31 by the mode of turning down voltage transformation module 4 output voltages, when the current value ratio of the current output terminal of first power consumption module 31 less, during not enough the so that first triode V1 conducting, control module N adjusts voltage transformation module 4 in real time, heightens the current value of the electric current that flows through first power consumption module 31 by the mode of heightening voltage transformation module 4 output voltages.
As shown in Figure 3 and Figure 4, driving circuit in the present embodiment also comprises the protection module 6 that links to each other with control module N, wherein:
Control module N also is used for after receiving fault-signal, and control voltage transformation module 4 quits work.
When voltage transformation module 4 quits work, just can stop will being not enough to the voltage transitions of driving power consumption module 3 work be meet power consumption module 3 work voltage (for example: boost operations), thereby avoid voltage transformation module 4 to proceed boost operations, finally to the electric current of power consumption module 3 or other electronic devices and components input high voltage and cause power consumption module 3 or other electronic devices and components to burn.
As shown in Figure 4; voltage transformation module 4 comprises boost inductance L, metal-oxide-semiconductor V and the 4th resistance R 4 in the present embodiment; protection module 6 comprises NPN triode V2, PNP triode V3, storage capacitor C4, the 5th resistance R 5, the 6th resistance R 6 and voltage stabilizing diode Vz, wherein:
The current input terminal of boost inductance L links to each other with the current output terminal of extraneous power supply, and the current output terminal of boost inductance L links to each other with drain electrode and the voltage input end Uin of metal-oxide-semiconductor V respectively;
The source electrode of metal-oxide-semiconductor V is by the 4th resistance R 4 ground connection, and the gate pole of metal-oxide-semiconductor V links to each other with control module;
The anode of voltage stabilizing diode Vz links to each other with voltage input end Uin, and the negative electrode of voltage stabilizing diode Vz is by storage capacitor C4 ground connection;
Storage capacitor C4 and the 5th resistance R 5 of connecting and 6 parallel connections of the 6th resistance R;
The negative electrode of voltage stabilizing diode Vz is connected between the 5th resistance R 5 and the 6th resistance R 6;
The anode of voltage stabilizing diode Vz links to each other with the source electrode of metal-oxide-semiconductor V, the base stage of control module N, NPN triode V2, the emitter of PNP triode V3 respectively;
The grounded emitter of NPN triode V2, its collector links to each other with the base stage of PNP triode V3;
The collector of PNP triode V3 links to each other with control module N, and its emitter links to each other with constant voltage source Vin, and fault-signal is the voltage signal of constant voltage source Vin output.
Boost inductance L has the effect of savings electric current and boosted voltage, when metal-oxide-semiconductor V ends, boost inductance L puts aside electric current, during metal-oxide-semiconductor V conducting, the electric current that boost inductance L output voltage is higher, so can by control metal-oxide-semiconductor V by and the ratio of time of conducting be whether dutycycle control boost module carries out boost operations.
When power consumption module 3 open circuits, loss does not appear in the output voltage of voltage transformation module 4, the voltage of voltage transformation module 4 outputs continues to increase, at this moment, the electric current of the output of storage capacitor C4 storage voltage modular converter 4, and export to gradually on the bleeder circuit that the 5th resistance R 5 and the 6th resistance R 6 constituted, when the voltage on the 6th resistance R 6 reaches the forward voltage of certain voltage stabilizing diode Vz, voltage stabilizing diode Vz conducting, then, NPN triode V2 and PNP triode V3 conducting successively, after the PNP triode V3 conducting, the fault-signal of the high level signal form of constant voltage source Vin output inputs to control module N, and after control module N received the electric current of constant voltage source Vin output, control voltage transformation module 4 quit work.
When power consumption module 3 exists overcurrent or short circuit, the 4th resistance R 4 that links to each other with the metal-oxide-semiconductor V source electrode voltage rise height that powers on, the anode of the voltage stabilizing diode Vz voltage rise height that powers on, at this moment, NPN triode V2 and PNP triode V3 conducting successively, after the PNP triode V3 conducting, the fault-signal of the high level signal form of constant voltage source Vin output inputs to control module N, after control module N received the electric current of constant voltage source Vin output, control voltage transformation module 4 quit work.
As shown in Figure 4, control module N comprises control module N0 and links to each other with control module N0 in the present embodiment feedback pin FB, startup pin BO, protection pin CS, driving pin Drv and driving pin Vcc, wherein:
Feedback pin FB links to each other with the collector of the first triode V1;
Starting pin BO links to each other with enabling signal input end, the dim signal input end of the external circuit board respectively;
Protection pin CS links to each other with the source electrode of metal-oxide-semiconductor V, the anode of voltage stabilizing diode Vz, the emitter of PNP triode V3 respectively;
Driving pin Drv links to each other with the gate pole of metal-oxide-semiconductor V;
Drive pin Vcc and link to each other, be used for obtaining electric current from extraneous power supply with extraneous source current output terminal;
Control module N0 is used for the enabling signal that received according to the enabling signal input end, by controlling voltage transformation module 4 and start or stop work driving mode that pin Drv sends the control signal of high-low level form;
Control module N0 is used for the dim signal that received according to the dim signal input end, and by changing driving the mode of dutycycle that pin Drv sends the control signal of high-low level form, control voltage transformation module 4 starts or stops the frequency of work;
Control module N0 is used for receiving after the fault-signal by protection pin CS, and control voltage transformation module 4 quits work.
The effect of feedback pin FB is the current value and/or the magnitude of voltage of the current output terminal of reflection first power consumption module 31 in real time, start the enabling signal that pin BO is used to receive the external circuit board (for example mainboard of televisor) output, and with its Input Control Element N0, thereby driving control unit N0 enters duty; When the external circuit board was the mainboard of televisor, the adjustment backlight signal that dim signal can send for the mainboard of televisor was a pwm signal, and the enable signal backlight that enabling signal can be sent for the mainboard of televisor is the SW signal.
As shown in Figure 5, also be connected with constant voltage input end Vdd between feedback pin FB and the control module N0 in the present embodiment by divider resistance R0, constant voltage input end Vdd output voltage is a constant voltage, when with the first triode V1 conducting that feedback pin FB links to each other, the electric current that flows through feedback pin FB and divider resistance R0 increases, voltage on the divider resistance R0 reduces, otherwise, when the first triode V1 that links to each other with feedback pin FB ends, the electric current that flows through feedback pin FB and divider resistance R0 reduces, voltage on the divider resistance R0 gos up, control module N0 is by detecting the mode of the magnitude of voltage on feedback pin FB pin and the divider resistance R0, just can induced flow crosses the current value of the electric current of first power consumption module 31.
Control module N0 is by the mode of change to the dutycycle of the control signal of driving pin Drv transmission high-low level form, when control voltage transformation module 4 starts or stops the frequency of work, the value of the dutycycle of the control signal of high-low level form is big more, then voltage transformation module 4 starts and keeps the time of duty long more, voltage transformation module 4 starts and keeps the time of duty long more, the current value of the electric current of output is high more, so the power of power consumption module 3 also can be big more, when if power consumption module 3 is LED lamp bar, the current value of the electric current of input LED lamp bar is high more, then the brightness of the light launched of LED lamp bar is also high more, this shows that the frequency that control module N0 starts or stops work by control voltage transformation module 4 can be controlled the power consumption of power consumption module 3.
Control module N can use a chip that comprises above a plurality of pins separately in the present embodiment, also can be preferably an independent chip that comprises above a plurality of pins for chip and the common circuit that constitutes of other electronic devices and components.
The course of work of the circuit that more describes the preferred embodiment of the present invention in detail and provided below in conjunction with Fig. 3 and Fig. 4.
To control metal-oxide-semiconductor V be conducting to control module N or end by the mode that the gate pole of metal-oxide-semiconductor V is sent high level or low level signal, and then whether control voltage transformation module 4 carries out boost operations, and control time and the frequency that voltage transformation module 4 carries out boost operations by the mode of regulating the level signal dutycycle, when metal-oxide-semiconductor V conducting, the inductance L storage of electrical energy, voltage transformation module 4 output voltages reduce, otherwise, when metal-oxide-semiconductor V ends, the inductance L voltage rise height that powers on, this moment, voltage transformation module 4 output voltages raise, and also can raise so voltage transformation module 4 exports voltage input end Uin voltage to;
By voltage input end Uin input and the electric current that flows through coupling capacitance 1 is to exchange pulsating current (current waveform is similar to sawtooth wave).When metal-oxide-semiconductor ended, voltage input end Uin was by 1 charging of 1 pair first capacitor C of coupling module, and first capacitor C 1 is kept first power consumption module 31 and continued to light; During the metal-oxide-semiconductor conducting, by 2 chargings of 1 pair second capacitor C of coupling module, second capacitor C 2 is kept second power consumption module 32 and is continued to light.
The path that the interchange pulsating current flows through in first power consumption module 31 and second power consumption module, 32 formation series circuits is: voltage input end Uin → coupling module 1 → the second diode VD2 → first capacitor C 1 and first power consumption module, 31 → ground → second capacitor C 2 and second power consumption module, 32 → the first diode VD1 → coupling modules, 1 → metal-oxide-semiconductor V → ground.This shows that at this moment, first power consumption module 31 and second power consumption module 32 have constituted series circuit.
If when flowing through first power consumption module 31 and second power consumption module, 32 current imbalances, for example, flow through first power consumption module, 31 electric currents and be higher than second power consumption module 32, then can on coupling module 1, accumulate a voltage error in certain cycle, in the next cycle, can realize that electric current equates.Because voltage is certain on the coupling module 1.If accumulated a voltage error, constant in order to keep on the coupling module 1 voltage, can adjust charge and discharge process in the following cycle again, realize that finally electric current equates.
Because control module N can respond to the current value of the current output terminal of first power consumption module 31 by the collector of the first triode V1, and control the height of the magnitude of voltage of its output voltage by the mode of metal-oxide-semiconductor V dutycycle in the control Boost booster circuit, and then the size of the electric current of first power consumption module 31 and second power consumption module 32 is flow through in control, simultaneously, being LED lamp bar with first power consumption module 31 and second power consumption module 32 is example, when the conducting of LED lamp bar, its forward voltage drop Vf is certain, voltage U=Vf*n on the LED lamp bar (n is that the lamp bar uses LED quantity) then, so the electric current that flows through first power consumption module 31 and second power consumption module 32 of only controlling well in the embodiment of the invention gets final product, and does not have the problem of control loaded voltage on LED lamp bar.
The liquid crystal TV set that the embodiment of the invention provided, comprise as Fig. 2 or two power consumption module 3 shown in Figure 3 and the invention described above embodiment provided as Fig. 2, Fig. 3 or driving circuit shown in Figure 4, driving circuit is used to power consumption module 3 power supplies, and each power consumption module 3 is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar.
Because the identical technical characterictic of driving circuit that is provided with the invention described above embodiment is provided the liquid crystal TV set that the embodiment of the invention provided,, no longer repeat to set forth so also can produce identical technique effect, the identical technical matters of solution herein.
Liquid crystal TV set is preferably 32-37 cun side-light type liquid crystal TV set in the present embodiment, and the side-light type liquid crystal TV set has the suitable employing technical scheme that the embodiment of the invention provided of two lamp bars usually.Certainly, the technical scheme that the embodiment of the invention provided also can be applied on other televisors outside the side-light type liquid crystal TV set of 32-37 cun or on the electronic equipment of similar televisor.
Certainly, also can be other electronic devices and components outside the LED lamp bar as Fig. 2 or power consumption module shown in Figure 33 in the present embodiment.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation 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 domain of claim.
Claims (10)
1. a driving circuit is characterized in that, comprises voltage input end, the coupling module that links to each other with described voltage input end and the rectification module that links to each other with described coupling module, wherein:
Described coupling module is used for receiving the electric current that meets the total operating voltage of two power consumption module from described voltage input end, and is converted into the electric current that meets a described power consumption module operating voltage;
Described rectification module, being used for meeting the electric current of a described power consumption module operating voltage, input to respectively two described power consumption module that are cascaded is described power consumption module power supply.
2. driving circuit according to claim 1 is characterized in that, described coupling module is at least one electric capacity or be two above capacitances in series or be formed in parallel;
And/or the power of two described power consumption module is identical;
And/or each described power consumption module is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar;
And/or described rectification module comprises rectification unit and energy-storage units, wherein:
Described rectification unit, the electric current that is used for meeting a described power consumption module operating voltage inputs to described energy-storage units;
Described energy-storage units is used to receive and store the electric current of described rectification unit input, and inputs to two described power consumption module respectively.
3. driving circuit according to claim 2 is characterized in that, described coupling module is a polarity free capacitor; And/or described rectification unit comprises first diode and second diode, and described energy-storage units comprises first electric capacity and second electric capacity, and two described power consumption module comprise first power consumption module and second power consumption module, wherein:
The positive pole of described first diode links to each other with described coupling module, and its negative pole links to each other with the current input terminal of described first power consumption module, and the current output terminal of this described power consumption module in road links to each other with the current input terminal and the ground of described second power consumption module respectively;
The negative pole of described second diode links to each other with described coupling module, and its positive pole links to each other with the current output terminal of described second power consumption module;
The current input terminal that the two poles of the earth of described first electric capacity are connected in described first power consumption module with and current output terminal between;
The current input terminal that the two poles of the earth of described second electric capacity are connected in described second power consumption module with and current output terminal between and between the current output terminal.
4. driving circuit according to claim 3 is characterized in that, described coupling module, described first electric capacity and/or described second electric capacity are polypropylene capactive.
5. driving circuit according to claim 1 is characterized in that, this driving circuit also comprises voltage transformation module, control module and current sampling module, wherein:
Described voltage transformation module links to each other with described control module, described coupling module respectively, and described current sampling module links to each other with the current output terminal of described control module and described first power consumption module respectively;
Described voltage transformation module, be used for from the current output terminal received current of extraneous power supply and be translated into the electric current that meets the total operating voltage of two described power consumption module after the described coupling module of input;
Described control module is used for responding to by described current sampling module the current value of the current output terminal of described first power consumption module, and the electric current that described voltage transformation module is exported is described power consumption module working current.
6. driving circuit according to claim 5 is characterized in that, described voltage transformation module is the Boost booster circuit; And/or described control module is a control chip; And/or described current sampling module comprises first triode, first resistance and second resistance, wherein:
Described first resistance is connected between the current output terminal and ground of described first power consumption module;
The base stage of described first triode is connected between the current output terminal and first resistance of described first power consumption module by described second resistance;
The grounded emitter of described first triode, and its collector links to each other with described control module;
Described control module is used for responding to by the collector of described first triode current value and/or the magnitude of voltage of the current output terminal of described first power consumption module.
7. driving circuit according to claim 5 is characterized in that, this driving circuit also comprises the protection module that links to each other with described control module, wherein:
Described protection module is used for when described power consumption module open circuit, overcurrent or short circuit, described control module is sent the fault-signal of high-low level form;
Described control module also is used for after receiving described fault-signal, controls described voltage transformation module and quits work.
8. driving circuit according to claim 7; it is characterized in that; described voltage transformation module comprises boost inductance, metal-oxide-semiconductor and the 4th resistance, and described protection module comprises NPN triode, PNP triode, storage capacitor, the 5th resistance, the 6th resistance and voltage stabilizing diode, wherein:
The current input terminal of described boost inductance links to each other with the current output terminal of described extraneous power supply, and the current output terminal of described boost inductance links to each other with the drain electrode and the described voltage input end of described metal-oxide-semiconductor respectively;
The source electrode of described metal-oxide-semiconductor is by described the 4th resistance eutral grounding, and the gate pole of described metal-oxide-semiconductor links to each other with described control module;
The anode of described voltage stabilizing diode links to each other with described voltage input end, and the negative electrode of described voltage stabilizing diode is by described storage capacitor ground connection;
Described storage capacitor and described the 5th resistance of connecting and the 6th resistance parallel connection;
The negative electrode of described voltage stabilizing diode is connected between described the 5th resistance and described the 6th resistance;
The anode of described voltage stabilizing diode links to each other with the base stage of the source electrode of described metal-oxide-semiconductor, described control module, described NPN triode, the emitter of described PNP triode respectively;
The grounded emitter of described NPN triode, its collector links to each other with the base stage of described PNP triode;
The collector of described PNP triode links to each other with described control module, and its emitter links to each other with constant voltage source, and described fault-signal is the voltage signal of described constant voltage source output.
9. driving circuit according to claim 7 is characterized in that, described control module comprises control module and the feedback pin that links to each other with described control module, starts pin, protects pin, drives pin and power pin, wherein:
Described feedback pin links to each other with the collector of described first triode;
Described startup pin links to each other with enabling signal input end, the dim signal input end of the external circuit board respectively;
Described protection pin links to each other with the anode of the source electrode of described metal-oxide-semiconductor, described voltage stabilizing diode, the emitter of described PNP triode respectively;
Described driving pin links to each other with the gate pole of described metal-oxide-semiconductor;
Described power pin links to each other with described extraneous source current output terminal, is used for obtaining electric current from described extraneous power supply;
Described control module is used for the enabling signal that received according to described enabling signal input end, starts or stops work by sending the mode of the control signal of high-low level form to control described voltage transformation module to described driving tube human hair combing waste;
Described control module, be used for the dim signal that received according to described dim signal input end, by changing the mode of dutycycle of described driving tube human hair combing waste being sent the control signal of high-low level form, control the frequency that described voltage transformation module starts or stops work;
Described control module is used for receiving after the described fault-signal by described protection pin, controls described voltage transformation module and quits work.
10. liquid crystal TV set, it is characterized in that, comprise two power consumption module and aforesaid right requirement 1 to 9 arbitrary described driving circuit, described driving circuit is used to described power consumption module power supply, and each described power consumption module is that a paths of LEDs lamp bar or two-way were in series with last LED lamp bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120106004XU CN201994045U (en) | 2011-04-12 | 2011-04-12 | Driving circuit and liquid crystal television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120106004XU CN201994045U (en) | 2011-04-12 | 2011-04-12 | Driving circuit and liquid crystal television |
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| CN201994045U true CN201994045U (en) | 2011-09-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740535A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal display (LCD) television |
| CN103068096A (en) * | 2011-10-21 | 2013-04-24 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp |
-
2011
- 2011-04-12 CN CN201120106004XU patent/CN201994045U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740535A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal display (LCD) television |
| WO2012139403A1 (en) * | 2011-04-12 | 2012-10-18 | 青岛海信信芯科技有限公司 | Led backlight source drive circuit, led backlight source and liquid crystal display device |
| US9182629B2 (en) | 2011-04-12 | 2015-11-10 | Hisense Hiview Tech Co., Ltd. | LED backlight source drive circuit, LED backlight source and liquid crystal display device |
| CN103068096A (en) * | 2011-10-21 | 2013-04-24 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp |
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