CN106210575A - The drive circuit system of LCD TV and LCD TV - Google Patents
The drive circuit system of LCD TV and LCD TV Download PDFInfo
- Publication number
- CN106210575A CN106210575A CN201610516995.6A CN201610516995A CN106210575A CN 106210575 A CN106210575 A CN 106210575A CN 201610516995 A CN201610516995 A CN 201610516995A CN 106210575 A CN106210575 A CN 106210575A
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- circuit
- lamp bar
- led
- led lamp
- differential mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
Abstract
The present invention provides drive circuit system and the LCD TV of a kind of LCD TV.The drive circuit system of this LCD TV includes: electric source filter circuit, bridge-type LED rectification circuit, PFC pfc circuit, LED circuit and light modulation and constant-current control circuit；Wherein, bridge-type LED rectification circuit includes: the first LED lamp bar unit, the second LED lamp bar unit, the 3rd LED lamp bar unit and the 4th LED lamp bar unit；Electric source filter circuit is connected with mains supply and bridge-type LED rectification circuit；Pfc circuit is connected with constant-current control circuit with bridge-type LED rectification circuit, LED circuit and light modulation；Light adjusting circuit is connected with the LED lamp bar in control chip, LED circuit and current sampling circuit, being also connected with control chip of current sampling circuit.Circuit of the present invention is simple, and cost is relatively low.
Description
Technical field
The present invention relates to television circuit technical field, particularly relate to drive circuit system and the liquid crystal electricity of a kind of LCD TV
Depending on.
Background technology
Along with development and the further investigation of light emitting diode (Light Emitting Diode is called for short LED) technology,
LED has become as a kind of main flow as the backlight of LCD TV, and owing to the liquid crystal panel of LCD TV itself is the most luminous, needs
Normal show image, therefore, one of backlight key part and component becoming LCD TV is come by the light source that backlight provides.
Backlight drive circuit in backlight, drives two-way even more multi-way LED lamp bar luminous, and every paths of LEDs lamp bar includes multiple series connection
LED, thus for liquid crystal panel provide backlight.The type of drive of backlight drive circuit is that a road booster circuit drives a road
LED lamp bar, realizes each street lamp bar electric current by the electric current of the every street lamp bar of sampling equal, to meet TV image display requirement.
Fig. 1 is the structural representation of the drive circuit system of existing LCD TV.In prior art, LED liquid crystal television
Circuits System use construction for electricity and power drives mode as shown in Figure 1.Power supply power pack, by electric source filter circuit,
Bridge rectifier, PFC (Power Factor Correction is called for short PFC) circuit, primary control and power supply
(Volt Current Condenser is called for short VCC) generative circuit, half-bridge resonance control chip circuit, LLC resonance control and energy
Amount transfer circuit constitutes (LLC represents inductance (L), inductance (L), the abbreviation of electric capacity (C)), and LLC resonance controls and energy transmission electricity
The voltage that road produces 12V and 100V by switch transformer exports, in order to power to secondary power circuit and driving circuit section.
Driving circuit section, including LED drive circuit, Boost circuit, light adjusting circuit and current sampling circuit, only shows in Fig. 1
The two street lamp bars that one drive circuit controls, the driving control mode of Multi-path lamp strip is complete with the driving control mode of two street lamp bars
Exactly the same.The topological mode that every street lamp bar all uses Boost to boost, needs a Boost circuit, light adjusting circuit and electric current
Sample circuit normally works to meet LED.Therefore, foregoing circuit system device is more, relatively costly.
Summary of the invention
The present invention provides drive circuit system and the LCD TV of a kind of LCD TV, to overcome TV in prior art
Drive circuit system device is more, relatively costly problem.
First aspect, the present invention provides the drive circuit system of a kind of LCD TV, including:
Electric source filter circuit, bridge-type LED rectification circuit, PFC pfc circuit, LED circuit and light modulation are with permanent
Flow control circuit；
Wherein, described electric source filter circuit includes the first outfan and the second outfan；
Described bridge rectifier LED circuit includes: the first LED lamp bar unit, the second LED lamp bar unit, the 3rd LED lamp bar list
Unit and the 4th LED lamp bar unit；One end of described first LED lamp bar unit and one end of described 4th LED lamp bar unit are
One junction point is connected in series, and one end of described second LED lamp bar unit and one end of described 3rd LED lamp bar unit are second even
Contact is connected in series；The other end of described first LED lamp bar unit and the other end of described second LED lamp bar unit are the 3rd even
Contact connects；The other end of described 3rd LED lamp bar unit and the other end of described 4th LED lamp bar unit are at the 4th junction point
Connect；Described LED lamp bar unit includes at least one LED lamp bar；Described LED lamp bar includes the LED that at least two is connected；Institute
State first junction point first input end as described bridge-type LED rectification circuit；Described second junction point is as described bridge-type LED
Second input of rectification circuit；Described 3rd junction point is as the outfan of described bridge-type LED rectification circuit；Described 4th even
Contact is connected to reference to ground；
Described light modulation includes with constant-current control circuit: control chip, light adjusting circuit and current sampling circuit；
Described LED circuit includes at least one described LED lamp bar；
The input of described electric source filter circuit is connected to mains supply, and the first outfan of described electric source filter circuit is even
Being connected to the first input end of described bridge-type LED rectification circuit, the second outfan of described electric source filter circuit is connected to described bridge
Second input of formula LED rectification circuit；
The outfan of described bridge-type LED rectification circuit is connected to the input of described pfc circuit；
First outfan of described pfc circuit is connected with described control chip, the second outfan of described pfc circuit and institute
The first end stating the described LED lamp bar in LED circuit connects；
First end of described light adjusting circuit is connected with described control chip, the second end of described light adjusting circuit and described LED
Second end of the described LED lamp bar in circuit connects；
One end of described current sampling circuit respectively with described control chip and the three-terminal link of described light adjusting circuit；
The other end of described current sampling circuit is connected to described with reference to ground.
Second aspect, the present invention provides a kind of LCD TV, including:
Drive circuit system as according to any one of first aspect, and liquid crystal panel.
The drive circuit system of LCD TV of the present invention and LCD TV, wherein, the drive circuit system bag of LCD TV
Include: electric source filter circuit, bridge-type LED rectification circuit, PFC pfc circuit, LED circuit and light modulation and current constant control
Circuit；Wherein, bridge rectifier LED circuit includes: the first LED lamp bar unit, the second LED lamp bar unit, the 3rd LED lamp bar unit
With the 4th LED lamp bar unit；Electric source filter circuit is connected with mains supply and bridge rectifier LED circuit；Pfc circuit and bridge-type
LED rectification circuit, LED circuit and light modulation are connected with constant-current control circuit；In light adjusting circuit and control chip, LED circuit
LED lamp bar and current sampling circuit connect, and being also connected with control chip of current sampling circuit, compare existing drive circuit
System, circuit structure is simple, and device is less, and cost is relatively low.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is this
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the drive circuit system of existing LCD TV；
Fig. 2 is the structural representation of drive circuit system one embodiment of LCD TV of the present invention；
Fig. 3 is the structural representation one of present invention driver circuit system one embodiment；
Fig. 4 is the structural representation two of present invention driver circuit system one embodiment；
Fig. 5 is the structural representation of present invention driver circuit another embodiment of system；
Fig. 6 is the structural representation of present invention driver circuit another embodiment of system；
Fig. 7 A is the structural representation one of present invention driver circuit another embodiment of system；
Fig. 7 B is the structural representation two of present invention driver circuit another embodiment of system；
Fig. 8 is the structural representation of the another embodiment of present invention driver circuit system；
Fig. 9 is the structural representation of the another embodiment of present invention driver circuit system.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
The drive circuit system of the embodiment of the present invention, for TV be: alternating current regards.This TV all of work electricity
Press the exchange (AC) without Switching Power Supply to change to direct current (DC), take from the civil power input of exchange completely, carry out relevant exhausted
On the basis of the security protection of edge and leakage current etc., farthest simplify the usage amount of the drive circuit system device of TV, fall
The reliability of system is improved while the cost of low system.
Fig. 2 is the structural representation of drive circuit system one embodiment of LCD TV of the present invention.As in figure 2 it is shown, this reality
Execute the drive circuit system of the LCD TV of example, including:
Electric source filter circuit, bridge-type LED rectification circuit, PFC pfc circuit, LED circuit and light modulation are with permanent
Flow control circuit；
Wherein, described electric source filter circuit includes the first outfan and the second outfan；
Described bridge rectifier LED circuit includes: first LED lamp bar unit the 1, second LED lamp bar unit the 2, the 3rd LED lamp bar
Unit 3 and the 4th LED lamp bar unit 4；One end of first LED lamp bar unit 1 and one end of the 4th LED lamp bar unit 4 are first
Junction point a1 is connected in series, and one end of the second LED lamp bar unit 2 and one end of the 3rd LED lamp bar unit 3 are at the second junction point a2
It is connected in series；The other end of described first LED lamp bar unit 1 and the other end of described second LED lamp bar unit 2 connect the 3rd
Point a3 connects；The other end of described 3rd LED lamp bar unit 3 and the other end of described 4th LED lamp bar unit 4 connect the 4th
Point a4 connects；Described LED lamp bar unit includes at least one LED lamp bar；Described LED lamp bar includes what at least two was connected
LED；Described first junction point is as the first input end of described bridge-type LED rectification circuit；Described second junction point is as described
Second input of bridge-type LED rectification circuit；Described 3rd junction point is as the outfan of described bridge-type LED rectification circuit；Institute
State the 4th junction point to be connected to reference to ground；
Described light modulation includes with constant-current control circuit: control chip, light adjusting circuit and current sampling circuit；
Described LED circuit includes at least one described LED lamp bar；
The input of described electric source filter circuit is connected to mains supply, and the first outfan of described electric source filter circuit is even
Being connected to the first input end of described bridge-type LED rectification circuit, the second outfan of described electric source filter circuit is connected to described bridge
Second input of formula LED rectification circuit；The outfan of described bridge-type LED rectification circuit is connected to the input of described pfc circuit
End；
First outfan of described pfc circuit is connected with described control chip, the second outfan of described pfc circuit and institute
The first end stating the described LED lamp bar in LED circuit connects；
First end of described light adjusting circuit is connected with described control chip, the second end of described light adjusting circuit and described LED
Second end of the described LED lamp bar in circuit connects；
One end of described current sampling circuit respectively with described control chip and the three-terminal link of described light adjusting circuit；
The other end of described current sampling circuit is connected to described with reference to ground.
Concrete, the drive circuit system of the embodiment of the present invention, specifically include that mains supply, electric source filter circuit, bridge-type
LED rectification circuit, pfc circuit, LED circuit and light modulation and a few part of constant-current control circuit.
Mains supply refers to the mains supply of exchange, and the line voltage according to country variant or area is different, can input
Different supply voltages, and decide the pressure drop of the LED lamp bar that should design in this drive circuit system, and then determine that this system is adopted
LED number.Such as, domestic line voltage is that 220V, LED are as selected the LED of 6V pressure drop every, then in drive circuit system
The maximum LED number that can connect is M=220V/6V, and round numbers can select M=36.
Electric source filter circuit is for filtering the common mode disturbances in the line voltage that mains supply exports and differential mode interference, simultaneously
Short-circuit protection and carrying out surge protection can be carried out.
Bridge-type LED rectification circuit is the Key Circuit part of the embodiment of the present invention, and this partial circuit includes four pressure drop phases
Same LED lamp bar unit, the first LED lamp bar unit 1 is connected with the 4th LED lamp bar unit 4, at its first junction point connected
(i.e. the first of electric source filter circuit exports in one end of supply voltage output after connecting the filtering of mains supply input power filter circuit
End)；Second LED lamp bar unit 2 is connected with the 3rd LED lamp bar unit 3, connects mains supply at its second junction point connected
The other end (i.e. the second outfan of electric source filter circuit) of supply voltage output after the filtering of input power filter circuit；First lamp
The 3rd junction point that the negative electrode of article unit 1 and the negative electrode of the second lamp article unit 2 are connected is as the output of bridge-type LED rectification circuit
End, is then connected to the pfc circuit of rear end；The 4th company that the anode of the 4th lamp article unit 4 and the anode of the 3rd lamp article unit 3 are connected
Contact, is connected to the reference ground of drive circuit system；This reference ground is thermally.This partial circuit had both played drive circuit system
Rectification function, has again the function of the luminescence unit participating in drive circuit system.By rectification and luminescence are effectively integrated one
Rise, the quantity of system device can be greatly reduced, while reducing system cost, improve the reliability of system.
Wherein, above-mentioned first LED lamp bar unit, the second LED lamp bar unit, the 3rd LED lamp bar unit and the 4th LED lamp bar
Unit the most at least includes a lamp bar, or, including multiple lamp bars in parallel.
Pfc circuit plays the function of PFC, coordinates light modulation and constant-current control circuit effectively to buffer tune simultaneously
Current energy too much in photoreduction process, reduces electric current shake during system light modulation, makes the work of whole drive circuit system more stable.
LED circuit is made up of single channel or multi-way LED lamp bar, and this part can carry out lamp according to actual product brightness demand
The adjustment of bar quantity, but need to coordinate control by control chip, a street lamp bar can only be had to light, to avoid bridge-type every time
The too high risk causing product brightness irregularities of electric current in LED circuit.And a number of LED is by input city on each cluster of lamps, ornamental bar
The impact of piezoelectric voltage.
Light modulation includes with constant-current control circuit: control chip, light adjusting circuit and current sampling circuit.This control chip is can
For the control chip of alternating current source, this control chip is received the control instruction of machine product and is controlled by light adjusting circuit
The conducting of LED circuit reaches the purpose of light modulation with the ratio of turn-off time.This chip can take to electric current with output reference voltage simultaneously
On sample circuit, and adjust the energy storage of pfc circuit in real time by being connected to the pin of pfc circuit and release energy, thus play control
System output, to the effect of LED lamp bar energy, reaches the purpose of constant-current driving LED lamp bar.
Fig. 3 is the structural representation one of present invention driver circuit system one embodiment, and Fig. 4 is present invention driver circuit system
The structural representation two of one embodiment.
The specific works process of drive circuit system is as follows, and only includes as a example by a LED lamp bar by LED circuit below
Illustrate:
In LED circuit, connection one cluster of lamps, ornamental bar and line voltage are as a example by domestic 220V 60Hz inputs, connected lamp string
For lamp bar 5, the pressure drop of every LEDs lamp bead is 6V.
First, the voltage that mains supply inputs becomes the simple alternating current of the cleanest 60Hz after electric source filter circuit
Voltage is input to bridge-type LED rectification circuit.
Then, within the time cycle of an ac commercial power voltage, when exchanging forward voltage input, the circuit worked
Part, as it is shown on figure 3, the electric current the first LED lamp bar unit 1 from bridge-type LED rectification circuit flows into, passes sequentially through pfc circuit,
Lamp bar 5, light adjusting circuit, current sampling circuit, then flow through the 3rd LED lamp bar unit 3 through reference, it is finally returned to exchange city
Another input of electricity, forms current loop.In this work process, electric current flows only through the first LED lamp bar unit 1, lamp article 5 and
The lamp bar of three LED lamp bar unit 3, only this three part is luminous, and the second LED lamp bar unit 2 and the 4th LED lamp bar unit 4 are because adding
It is the most luminous that the voltage carried is that backward voltage ends.Light adjusting circuit conducting in this path, the most whole loop is luminous；Light adjusting circuit closes
Disconnected, the most whole loop disconnects, the most luminous；In actual applications, the purpose of LED light modulation can be realized by adjusting light modulating frequency.
Within the time cycle of an ac commercial power voltage, when exchanging backward voltage input, the circuit part worked
As shown in Figure 4, the electric current the second LED lamp bar unit 2 from bridge-type LED rectification circuit flows into, and passes sequentially through pfc circuit, lamp bar
5, light adjusting circuit, current sampling circuit, then flow through the 4th LED lamp bar unit 4 through reference, it is finally returned to electric main
Another input, forms current loop.In this work process, electric current flows only through the second LED lamp bar unit 2, lamp article 5 and the 4th
The lamp bar of LED lamp bar unit 4, only this three part is luminous, and the first LED lamp bar unit 1 and the 3rd LED lamp bar unit 3 are because loading
Voltage to be that backward voltage ends the most luminous.Light adjusting circuit conducting in this path, the most whole loop is luminous；Light adjusting circuit closes
Disconnected, the most whole loop disconnects, the most luminous；In actual applications, the purpose of LED light modulation can be realized by adjusting light modulating frequency.
Wherein, in drive circuit system work process, lamp bar 5 is the most luminous, only has in bridge-type LED rectification circuit every time
Two lamp bar unit are luminous.Each lamp bar controls light adjusting circuit and electric current by light modulation with constant-current control circuit in luminescence process
Sample circuit reaches the purpose of light modulation and constant current, coordinates light modulation by controlling the energy storage of pfc circuit with releasing energy, it is achieved steady
Fixed brightness and dimming effect.
Further, owing in bridge-type LED rectification circuit in each electric main cycle, only two lamp bar unit are lighted,
And be connected in whole current loop with lamp bar 5, it is therefore desirable to the reasonably lamp bead of configured light bar 5 and bridge-type LED rectification circuit
In the lamp bead quantity of every cluster of lamps, ornamental bar unit, principle is: in each loop, total number of lamp bead is equal to M=220V/6V (taking 36), bridge
A number of the every cluster of lamps, ornamental bar unit in formula LED rectification circuit is equal, and reversely ends the Voltage Series summation that can bear more than city
Electricity maximum 311V, residue lamp bead is put in lamp bar 5 series connection.
The embodiment of the present invention utilize bridge-type LED rectification circuit directly drive LED lamp bar to save the primary side switch of complexity
The circuit framework of power supply chip and primary side driving chip is brand-new relative to existing circuit framework.
Comparison diagram 1 is visible, and the drive circuit system of the embodiment of the present invention is compared original conventional Circuits System and saved half
Bridge resonance control chip, LLC resonance control and energy transfer circuit, secondary power circuit, LED drive circuit and Boost boosting
Circuit, and simplify primary control and VCC generative circuit, save the transformator of VCC generative circuit.From the angle of system, electricity
The simplification on road brings the raising of system reliability.
The drive circuit system that the present embodiment provides, including: electric source filter circuit, bridge-type LED rectification circuit, power factor
Correction pfc circuit, LED circuit and light modulation and constant-current control circuit；Wherein, bridge rectifier LED circuit includes: the first LED
Article unit, the second LED lamp bar unit, the 3rd LED lamp bar unit and the 4th LED lamp bar unit；Electric source filter circuit and civil power electricity
Source and bridge rectifier LED circuit connect；Pfc circuit and bridge-type LED rectification circuit, LED circuit and light modulation and current constant control electricity
Road connects；Light adjusting circuit is connected with the LED lamp bar in control chip, LED circuit and current sampling circuit, current sampling circuit
Be also connected with control chip, compare existing drive circuit system, circuit structure is simple, and device is less, and cost is relatively low.
Fig. 5 is the structural representation of present invention driver circuit another embodiment of system.On the basis of above-described embodiment, this
In embodiment, as it is shown in figure 5, described bridge-type LED rectification circuit, also include:
First shunt capacitance C1, the second shunt capacitance C2 and storage capacitor C3；
Wherein, the first end of described first shunt capacitance C1 is connected to described first junction point a1；Described first bypass electricity
The second end holding C1 is respectively connecting at described 4th junction point a4 and first end of described storage capacitor C3；
First end of described second shunt capacitance C2 is connected to described second junction point a2；Described second shunt capacitance C2
Second end is connected to the input of described pfc circuit；
First end of described storage capacitor C3 is connected to described with reference to ground, and second end of described storage capacitor C3 is connected to institute
State the input of pfc circuit.
Concrete, the first shunt capacitance C1, the second shunt capacitance C2 play filter action in circuit, and storage capacitor C3 exists
Circuit plays the energy hunting in the DC current after absorbing rectification.
On the basis of above-described embodiment, alternatively, as a kind of enforceable mode, described light adjusting circuit includes at least
One dimming unit, described current sampling circuit includes at least one current sampling unit；Described dimming unit and described electric current
The quantity of sampling unit is equal with the described LED lamp bar quantity in described LED circuit.
Fig. 6 is the structural representation of present invention driver circuit another embodiment of system.Fig. 7 A is present invention driver circuit system
The structural representation one of another embodiment of uniting.Fig. 7 B is the structural representation two of present invention driver circuit another embodiment of system.
Wherein, in actual applications, alternatively, as shown in Figure 6, described dimming unit, including:
Switch metal-oxide-semiconductor；Described current sampling unit, including: sample resistance；
Wherein, the grid G of described switch metal-oxide-semiconductor is connected with described control chip, the drain D of described switch metal-oxide-semiconductor and institute
The second end stating the described LED lamp bar in LED circuit connects；
First end of described sample resistance source S with described control chip and described switch metal-oxide-semiconductor respectively is connected；Institute
The second end stating sample resistance is connected to described with reference to ground.
Specifically, the specific works process of drive circuit system is as follows, and only includes two LED with LED circuit below
Illustrate as a example by lamp bar:
First, the voltage that mains supply inputs becomes the simple alternating current of the cleanest 60Hz after electric source filter circuit
Voltage is input to bridge-type LED rectification circuit.
Then, within the time cycle of an ac commercial power voltage, when exchanging forward voltage input, the circuit worked
As shown in Figure 7 A, the electric current the first LED lamp bar unit 1 from bridge-type LED rectification circuit flows into part, by pfc circuit, then divides
Not Tong Guo lamp bar 5, lamp bar 6, the switch metal-oxide-semiconductor of dimming unit, the sample resistance of current sampling unit, then through with reference to flow through
3rd LED lamp bar unit 3, is finally returned to another input of electric main, forms current loop.In this work process, electricity
Stream flows only through the lamp bar of the first LED lamp bar unit 1, lamp article 5, lamp article 6 and the 3rd LED lamp bar unit 3, only this three part and sends out
Light, the second LED lamp bar unit 2 and the 4th LED lamp bar unit 4 end the most luminous because the voltage loaded is backward voltage.This leads to
In road, the switch metal-oxide-semiconductor of one of them dimming unit is opened, and the most whole loop is luminous；The switch metal-oxide-semiconductor of two dimming unit closes
Closing, the most whole loop disconnects, the most luminous；In actual applications, the purpose of LED light modulation can be realized by adjusting light modulating frequency.
Within the time cycle of an ac commercial power voltage, when exchanging backward voltage input, the circuit part worked
As shown in Figure 7 B, the electric current the second LED lamp bar unit 2 from bridge-type LED rectification circuit flows into, and by pfc circuit, then leads to respectively
Cross lamp bar 5, lamp bar 6, the switch metal-oxide-semiconductor of dimming unit, the sample resistance of current sampling unit, then flow through the 4th through reference
LED lamp bar unit 4, is finally returned to another input of electric main, forms current loop.In this work process, electric current is only
The lamp bar flowing through the second LED lamp bar unit 2, lamp article 5, lamp article 6 and the 4th LED lamp bar unit 4, only this three part is luminous, the
One LED lamp bar unit 1 and the 3rd LED lamp bar unit 3 end the most luminous because the voltage loaded is backward voltage.In this path its
In the switch metal-oxide-semiconductor of a dimming unit open, the most whole loop is luminous；The switch metal-oxide-semiconductor of two dimming unit is closed, the most whole
Individual loop disconnects, the most luminous；In actual applications, the purpose of LED light modulation can be realized by adjusting light modulating frequency.
Wherein, in Circuits System work process, lamp bar 5 and lamp bar 6 are the most luminous, in bridge-type LED rectification circuit every time
Only two cluster of lamps, ornamental bars are luminous.Each luminescence process controls switch metal-oxide-semiconductor and sample resistance by light modulation with constant-current control circuit
Resistance reach light modulation and the purpose of constant current, coordinate light modulation by controlling the energy storage of pfc circuit with releasing energy, it is achieved stable
Brightness and dimming effect.
Further, owing in bridge-type LED rectification circuit in each electric main cycle, only two cluster of lamps, ornamental bars are lighted, and with
Lamp bar 5 and lamp bar 6 are connected in whole current loop, it is therefore desirable to rational configured light bar 5 and the lamp bead of lamp bar 6 and bridge-type
The lamp bead quantity of every cluster of lamps, ornamental bar in LED circuit, principle is: in each loop, total number of lamp bead is equal to M=220V/6V (taking 36)
, a number of the every cluster of lamps, ornamental bar in bridge-type LED rectification circuit is equal, and reversely ends the Voltage Series summation that can bear more than city
Electricity maximum 311V, residue lamp bead is put in lamp bar 5 and lamp bar 6 series connection.
Fig. 8 is the structural representation of the another embodiment of present invention driver circuit system.On the basis of above-described embodiment, can
Selection of land, as a kind of enforceable mode, as shown in Figure 8, described electric source filter circuit, including:
First common mode inductance L1, the second common mode inductance L2, the first differential mode capacitor C4, the second differential mode capacitor C5 and first are poor
Mould resistance R1, the second differential mode resistance R2 and the 3rd differential mode resistance R3；
Wherein, first end of described first common mode inductance L1 is connected on the first power line of described mains supply, described
Second end of the first common mode inductance L1 is connected on the second source line of described mains supply；The of described first common mode inductance L1
First end of three-terminal link extremely described first differential mode resistance R1；4th end of described first common mode inductance L1 is connected to the described 3rd
First end of differential mode resistance R3；
Second end of described first differential mode resistance R1 is connected with first end of described second differential mode resistance R2, described second poor
Second end of mould resistance R2 is connected with second end of described 3rd differential mode resistance R3；
First end of described first differential mode capacitor C4 is connected on the first power line of described mains supply, described first poor
Second end of mould electric capacity C4 is connected on the second source line of described mains supply；
First end of described second differential mode capacitor C5 is connected to first end of described first differential mode resistance R1；Described second poor
Second end of mould electric capacity C5 is connected to first end of described 3rd differential mode resistance R3；
First end of described second common mode inductance L2 is connected to first end of described first differential mode resistance R1, and described second altogether
Second end of mould inductance L2 is connected to first end of described 3rd differential mode resistance R3；3rd end of described second common mode inductance L2 is even
It is connected to the first input end of described bridge-type LED rectification circuit；4th end of described second common mode inductance L2 is connected to described bridge-type
Second input of LED rectification circuit.
Concrete, electric source filter circuit is used for common mode disturbances and the differential mode interference filtering in the voltage of mains supply output,
Including: the first common mode inductance L1, the second common mode inductance L2, the first differential mode capacitor C4, the second differential mode capacitor C5 and the first differential mode
Resistance R1, the second differential mode resistance R2 and the 3rd differential mode resistance R3.When utility grid has differential mode interference, can be poor by first
Mould electric capacity C4, the second differential mode capacitor C5 and the first differential mode resistance R1, the second differential mode resistance R2 and the 3rd differential mode resistance R3 let out
Put elimination.When utility grid has common mode disturbances, can be released by the first common mode inductance L1, the second common mode inductance L2
Eliminate.
Fig. 9 is the structural representation of the another embodiment of present invention driver circuit system.On the basis of above-described embodiment, can
Selection of land, as a kind of enforceable mode, as it is shown in figure 9, described electric source filter circuit, also includes:
Critesistor RT1, varistor RV1 and electric fuse F；
Wherein, first end of described critesistor RT1 is connected on the first power line of described mains supply, described temperature-sensitive
Second end of resistance RT1 is connected to first end of described first common mode inductance L1；
First end of described varistor RV1 is connected to first end of described critesistor RT1, described varistor RV1
The second end be respectively connecting to one end and second end of described first common mode inductance L1 of described electric fuse F；
The other end of described electric fuse F is connected on the second source line of described mains supply.
Concrete, electric source filter circuit is done except the common mode disturbances in the voltage for filtering mains supply output and differential mode
Disturb, short-circuit protection and carrying out surge protection can also be carried out simultaneously, cross stream event when utility grid has surge voltage or Circuits System
During barrier, critesistor RT1, varistor RV1 and electric fuse F will play corresponding fuse protection effect.
In above-mentioned detailed description of the invention, with the technical scheme of embodiment as shown in Figure 2, it realizes principle and technique effect class
Seemingly, here is omitted.
In LCD TV one embodiment of the present invention, the LCD TV of the present embodiment, may include that
The drive circuit system of the LCD TV as described in above-mentioned Fig. 2-Fig. 9 any embodiment, and liquid crystal panel.
It should be noted that for LCD TV embodiment, implement owing to it essentially corresponds to drive circuit system
Example, so the part that relevant part sees drive circuit system embodiment illustrates.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (7)
1. the drive circuit system of a LCD TV, it is characterised in that including:
Electric source filter circuit, bridge-type LED rectification circuit, PFC pfc circuit, LED circuit and light modulation and constant current control
Circuit processed；
Wherein, described electric source filter circuit includes the first outfan and the second outfan；
Described bridge-type LED rectification circuit includes: the first LED lamp bar unit, the second LED lamp bar unit, the 3rd LED lamp bar unit and
4th LED lamp bar unit；One end of described first LED lamp bar unit and one end of described 4th LED lamp bar unit are first even
Contact is connected in series, and one end of described second LED lamp bar unit and one end of described 3rd LED lamp bar unit are at the second junction point
It is connected in series；The other end of described first LED lamp bar unit and the other end of described second LED lamp bar unit are at the 3rd junction point
Connect；The other end of described 3rd LED lamp bar unit and the other end of described 4th LED lamp bar unit are at the 4th junction point even
Connect；Described LED lamp bar unit includes at least one LED lamp bar；Described LED lamp bar includes the LED that at least two is connected；Described
First junction point is as the first input end of described bridge-type LED rectification circuit；Described second junction point is whole as described bridge-type LED
Second input of current circuit；Described 3rd junction point is as the outfan of described bridge-type LED rectification circuit；Described 4th connects
Point is connected to reference to ground；
Described light modulation includes with constant-current control circuit: control chip, light adjusting circuit and current sampling circuit；
Described LED circuit includes at least one described LED lamp bar；
The input of described electric source filter circuit is connected to mains supply, and the first outfan of described electric source filter circuit is connected to
The first input end of described bridge-type LED rectification circuit, the second outfan of described electric source filter circuit is connected to described bridge-type LED
Second input of rectification circuit；
The outfan of described bridge-type LED rectification circuit is connected to the input of described pfc circuit；
First outfan of described pfc circuit is connected with described control chip, and the second outfan of described pfc circuit is with described
First end of the described LED lamp bar in LED circuit connects；
First end of described light adjusting circuit is connected with described control chip, the second end of described light adjusting circuit and described LED circuit
In described LED lamp bar second end connect；
One end of described current sampling circuit respectively with described control chip and the three-terminal link of described light adjusting circuit；Described
The other end of current sampling circuit is connected to described with reference to ground.
Drive circuit system the most according to claim 1, it is characterised in that described bridge-type LED rectification circuit, also includes:
First shunt capacitance, the second shunt capacitance and storage capacitor；
Wherein, the first end of described first shunt capacitance is connected to described first junction point；The second of described first shunt capacitance
End is respectively connecting at described 4th junction point and the first end of described storage capacitor；
First end of described second shunt capacitance is connected to described second junction point；Second end of described second shunt capacitance connects
Input to described pfc circuit；
First end of described storage capacitor is connected to described with reference to ground, and the second end of described storage capacitor is connected to described PFC electricity
The input on road.
Drive circuit system the most according to claim 1 and 2, it is characterised in that described light adjusting circuit includes at least one
Dimming unit, described current sampling circuit includes at least one current sampling unit；Described dimming unit and described current sampling
The quantity of unit is equal with the described LED lamp bar quantity in described LED circuit.
Drive circuit system the most according to claim 3, it is characterised in that described dimming unit, including:
Switch metal-oxide-semiconductor；Described current sampling unit, including: sample resistance；
Wherein, the grid of described switch metal-oxide-semiconductor is connected with described control chip, the drain electrode of described switch metal-oxide-semiconductor and described LED electricity
Second end of the described LED lamp bar in road connects；
First end of described sample resistance source electrode with described control chip and described switch metal-oxide-semiconductor respectively is connected；Described take
Second end of sample resistance is connected to described with reference to ground.
Drive circuit system the most according to claim 1 and 2, it is characterised in that described electric source filter circuit, including:
First common mode inductance, the second common mode inductance, the first differential mode capacitor, the second differential mode capacitor and the first differential mode resistance, second
Differential mode resistance and the 3rd differential mode resistance；
Wherein, the first end of described first common mode inductance is connected on the first power line of described mains supply, and described first altogether
Second end of mould inductance is connected on the second source line of described mains supply；The three-terminal link of described first common mode inductance is extremely
First end of described first differential mode resistance；4th end of described first common mode inductance is connected to the first of described 3rd differential mode resistance
End；
Second end of described first differential mode resistance is connected with the first end of described second differential mode resistance, described second differential mode resistance
Second end is connected with the second end of described 3rd differential mode resistance；
First end of described first differential mode capacitor is connected on the first power line of described mains supply, described first differential mode capacitor
The second end be connected on the second source line of described mains supply；
First end of described second differential mode capacitor is connected to the first end of described first differential mode resistance；Described second differential mode capacitor
Second end is connected to the first end of described 3rd differential mode resistance；
First end of described second common mode inductance is connected to the first end of described first differential mode resistance, described second common mode inductance
Second end is connected to the first end of described 3rd differential mode resistance；The three-terminal link of described second common mode inductance is to described bridge-type
The first input end of LED rectification circuit；4th end of described second common mode inductance is connected to the of described bridge-type LED rectification circuit
Two inputs.
Drive circuit system the most according to claim 5, it is characterised in that described electric source filter circuit, also includes:
Critesistor, varistor and electric fuse；
Wherein, the first end of described critesistor is connected on the first power line of described mains supply, described critesistor
Second end is connected to the first end of described first common mode inductance；
First end of described varistor is connected to the first end of described critesistor, and the second end of described varistor connects respectively
It is connected to one end and second end of described first common mode inductance of described electric fuse；
The other end of described electric fuse is connected on the second source line of described mains supply.
7. a LCD TV, it is characterised in that including:
Drive circuit system as described in any one of claim 1-6, and liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516995.6A CN106210575B (en) | 2016-07-01 | 2016-07-01 | The drive circuit system and LCD TV of LCD TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516995.6A CN106210575B (en) | 2016-07-01 | 2016-07-01 | The drive circuit system and LCD TV of LCD TV |
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| Publication Number | Publication Date |
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| CN106210575A true CN106210575A (en) | 2016-12-07 |
| CN106210575B CN106210575B (en) | 2019-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610516995.6A Active CN106210575B (en) | 2016-07-01 | 2016-07-01 | The drive circuit system and LCD TV of LCD TV |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021088253A1 (en) * | 2019-11-04 | 2021-05-14 | 海信视像科技股份有限公司 | Display device |
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| CN102045928A (en) * | 2010-12-18 | 2011-05-04 | 惠州大景照明控制有限公司 | LED (light-emitting diode) lamp power supply capable of dimming |
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| CN106210575B (en) | 2019-09-17 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co., Ltd Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |