CN203289702U - A backlight power supply circuit, a power supply apparatus, and a television set - Google Patents
A backlight power supply circuit, a power supply apparatus, and a television set Download PDFInfo
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- CN203289702U CN203289702U CN2013202683028U CN201320268302U CN203289702U CN 203289702 U CN203289702 U CN 203289702U CN 2013202683028 U CN2013202683028 U CN 2013202683028U CN 201320268302 U CN201320268302 U CN 201320268302U CN 203289702 U CN203289702 U CN 203289702U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a backlight power supply circuit, a power supply apparatus, and a television set, wherein the backlight power supply circuit is respectively connected to a mainboard and a backlight lamp bar, and the backlight power supply circuit is connected to a PFC power supply circuit of the power supply apparatus. The backlight power supply circuit comprises a resonance transformation module, a control module, a voltage protection module, and a current feedback module, wherein the control module controls the working of the resonance transformation module according to power switch signals of the mainboard, so that the backlight lamp bar is driven through the resonance transformation module. The backlight power supply circuit provided by the utility model transforms a PFC supply voltage output by the PCF power supply circuit through the resonance transformation module, and then the transformed PFC supply voltage is supplied to the backlight lamp bar to carry out power supply. The power supply carried on the backlight lamp bar is realized through the just one-grade transformation of the resonance transformation module. The energy efficiency of the backlight power supply circuit is effectively raised. The energy efficiency of the power supply apparatus is improved. The structure of the circuit is simplified. The power supply costs of the backlight lamp bar are reduced, so that the energy efficiency of the television set is improved, and the power consumption and costs of the television set are reduced.
Description
Technical field
The utility model relates to TV technology, relates in particular to a kind of backlight power supply circuit, supply unit and television set.
Background technology
At present, large-sized LED(Light Emitting Diode, light-emitting diode) television set is when work, and the power consumption of screen accounts for 70% of LED television set Overall Power Consumption at least.And present TV set power framework is all alternating current enter television set after, from PFC(Power Factor Correction, Active PFC) the PFC supply power voltage of power supply circuits output, first pass through the AC-DC power conversion, power to backlight lamp bar through the DC-DC power conversion and after boosting again, make the energy efficiency of backlight lamp bar reach 80%.But in above-mentioned TV set power framework, alternating current is through after the PFC power supply circuits, to pass through the AC-DC power conversion, this Two Stages of DC-DC power conversion could be powered to backlight lamp bar, and AC-DC Power Management Design and DC-DC Power Management Design more complicated, cost is also higher, and after AC-DC power conversion and DC-DC power conversion, the energy efficiency of power pack backlight is not very high, neither be clearly to the improvement of the raising of the energy efficiency of television set and low power capabilities.
The utility model content
Main purpose of the present utility model is to propose a kind of backlight power supply circuit, supply unit and television set, is intended to improve the energy efficiency of backlight power supply circuit in supply unit, and then improves the energy efficiency of television set, reduces power consumption and the cost of television set.
In order to achieve the above object, the utility model proposes a kind of backlight power supply circuit, this backlight power supply circuit is connected with backlight lamp bar with mainboard respectively, and with the PFC power supply circuits in supply unit, be connected, described backlight lamp bar comprises at least one lamp string, this backlight power supply circuit comprises be used to the resonant transformation module that drives described backlight lamp bar, and comprises the control module of controlling the work of described resonant transformation module for the power switch signal according to described mainboard; Wherein,
The detection input of described control module is connected with the power switch signal output of described mainboard, and the output of described control module is connected with the control end of described resonant transformation module; The input of described resonant transformation module is connected with the supply power voltage output of described PFC power supply circuits, and the output of described resonant transformation module is connected with the positive pole of described backlight lamp bar.
Preferably, described backlight power supply circuit also comprises for detection of and feeds back the voltage protection module of the voltage of described backlight lamp bar; The input of described voltage protection module is connected with the positive pole of described backlight lamp bar, and the output of described voltage protection module is connected with the voltage protection input of described control module.
Preferably, described backlight lamp bar comprises the first lamp string and the second lamp string, and described voltage protection module comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first diode and the second diode; Wherein,
The anode of described the first diode is connected with the positive pole of described the first lamp string via described the first resistance, and via described the second grounding through resistance, the negative electrode of described the first diode is connected with the voltage protection input of described control module via described the 5th resistance; The anode of described the second diode is connected with the positive pole of described the second lamp string via described the 3rd resistance, and via described the 4th grounding through resistance, the negative electrode of described the second diode is connected with the voltage protection input of described control module via described the 5th resistance.
Preferably, described backlight power supply circuit also comprises for the current feedback module of adjusting and feed back the electric current of described backlight lamp bar; The input of described current feedback module is connected with the negative pole of described backlight lamp bar, and the output of described current feedback module is connected with the current feedback input of described control module.
Preferably, described current feedback module comprises the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance; The first common port after described the 6th resistance, described the 7th resistance and the 8th resistance of being connected are parallel with one another is connected with the negative pole of described backlight lamp bar, and be connected the second common end grounding after described the 6th resistance, described the 7th resistance and described the 8th resistance are parallel with one another with the current feedback input of described control module via described the 9th resistance.
Preferably, described control module comprises operating voltage input, main control chip, the first transformer, the 3rd diode and the 4th diode; Wherein,
the energization pins of described main control chip is connected with described operating voltage input, the enable pin of described main control chip is connected with the power switch signal output of described mainboard, the signal ground pin of described main control chip and the equal ground connection of power supply ground pin, the current feedback input pin of described main control chip is via described the 9th resistance and described the 6th resistance, described the 7th resistance be connected first common port of the 8th resistance after parallel with one another and connect, the voltage protection input pin of described main control chip via described the 5th resistance respectively with the negative electrode of described the first diode be connected the negative electrode of the second diode and be connected, the first driver output pin of described main control chip, the second driver output pin respectively with the first pin of described the first transformer, crus secunda is corresponding to be connected, the 6th pin of described the first transformer all is connected with described resonant transformation module via described the 4th diode and the 5th pin via described the 3rd diode, the 4th pin, the tripod ground connection of described the first transformer.
Preferably, described control module also comprises voltage stabilizing didoe, the first triode, the second triode, the 3rd triode, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the first electric capacity, the second electric capacity; Wherein,
One end of described the 11 resistance is connected with the enable pin of described main control chip, and is connected the other end ground connection of described the 11 resistance with the power switch signal output of described mainboard via described the tenth resistance; Described the first electric capacity is in parallel with described the 11 resistance; The plus earth of described voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the base stage of described the first triode, and via described the 12 resistance, with described operating voltage input, is connected; The collector electrode of described the first triode is connected with described operating voltage input via described the 13 resistance, and the emitter of described the first triode is connected with the energization pins of described main control chip, and via described the second capacity earth; Described the 14 resistance is connected between the first pin of the first driver output pin of described main control chip and described the first transformer, and described the 15 resistance is connected between the crus secunda of the second driver output pin of described main control chip and described the first transformer; One end of described the 16 resistance is connected with the negative electrode of described the 3rd diode, the other end of described the 16 resistance is connected with the emitter of described the second triode, and be connected with the 5th pin of described the first transformer via described the 17 resistance, the other end of described the 16 resistance also is connected to described resonant transformation module; The base stage of described the second triode is connected with the 6th pin of described the first transformer via described the 18 resistance, and its collector electrode is connected with the 5th pin of described the first transformer; One end of described the 19 resistance is connected with the negative electrode of described the 4th diode, the other end of described the 19 resistance is connected with the emitter of described the 3rd triode, and be connected with the tripod of described the first transformer via described the 20 resistance, the other end of described the 19 resistance also is connected to described resonant transformation module; The base stage of described the 3rd triode is connected with the 6th pin of described the first transformer via described the 21 resistance, and its collector electrode is connected with the tripod of described the first transformer.
Preferably, described resonant transformation module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the second transformer, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 5th diode, the 6th diode, the 7th diode and the 8th diode; Wherein,
The grid of described the first metal-oxide-semiconductor and described the 16 resistance be connected the common port of the 17 resistance and be connected, the drain electrode of described the first metal-oxide-semiconductor is connected with the supply power voltage output of described PFC power supply circuits, the source electrode of described the first metal-oxide-semiconductor respectively with the drain electrode of the 5th pin of described the first transformer, described the second metal-oxide-semiconductor be connected the primary input terminal of the second transformer and be connected; The grid of described the second metal-oxide-semiconductor and described the 19 resistance be connected the common port of the 20 resistance and be connected, the source electrode of described the second metal-oxide-semiconductor is connected with the tripod of described the first transformer, and via the 3rd electric capacity, with the primary output terminal of described the second transformer, is connected; The anode of described the 5th diode is connected with secondary first output of described the second transformer via described the 4th electric capacity, and the negative electrode of described the 5th diode is connected with the positive pole of described the first lamp string, and via described the 5th capacity earth; The negative electrode of described the 6th diode is connected with secondary first output of described the second transformer, the plus earth of described the 6th diode; The anode of described the 7th diode is connected with secondary second output of described the second transformer, and the negative electrode of described the 7th diode is connected with the positive pole of described the second lamp string, and via described the 6th capacity earth; The negative electrode of described the 8th diode is connected with secondary second output of described the second transformer, the plus earth of described the 8th diode.
The utility model also proposes a kind of supply unit, this supply unit is connected with backlight lamp bar with mainboard respectively, comprise AC power, PFC power supply circuits, movement power supply circuits and standby power supply circuits, described backlight lamp bar comprises at least one lamp bar string, and this supply unit also comprises the backlight power supply circuit; This backlight power supply circuit respectively with described mainboard be connected backlight lamp bar and be connected, and with described PFC power supply circuits, be connected, described PFC power supply circuits respectively with described AC power be connected the movement power supply circuits and be connected, described movement power supply circuits are connected with described mainboard, and described standby power supply circuits are connected between described movement power supply circuits and described mainboard; This backlight power supply circuit comprises be used to the resonant transformation module that drives described backlight lamp bar, and comprises the control module of controlling the work of described resonant transformation module for the power switch signal according to described mainboard; Wherein,
The detection input of described control module is connected with the power switch signal output of described mainboard, and the output of described control module is connected with the control end of described resonant transformation module; The input of described resonant transformation module is connected with the supply power voltage output of described PFC power supply circuits, and the output of described resonant transformation module is connected with the positive pole of described backlight lamp bar.
The utility model further also proposes a kind of television set, this television set comprises mainboard and backlight lamp bar, described backlight lamp bar comprises at least one lamp bar string, this television set also comprises supply unit, this supply unit respectively with described mainboard be connected backlight lamp bar and be connected, this supply unit comprises AC power, PFC power supply circuits, movement power supply circuits and standby power supply circuits and backlight power supply circuit; This backlight power supply circuit respectively with described mainboard be connected backlight lamp bar and be connected, and with described PFC power supply circuits, be connected, described PFC power supply circuits respectively with described AC power be connected the movement power supply circuits and be connected, described movement power supply circuits are connected with described mainboard, and described standby power supply circuits are connected between described movement power supply circuits and described mainboard; This backlight power supply circuit comprises be used to the resonant transformation module that drives described backlight lamp bar, and comprises the control module of controlling the work of described resonant transformation module for the power switch signal according to described mainboard; Wherein,
The detection input of described control module is connected with the power switch signal output of described mainboard, and the output of described control module is connected with the control end of described resonant transformation module; The input of described resonant transformation module is connected with the supply power voltage output of described PFC power supply circuits, and the output of described resonant transformation module is connected with the positive pole of described backlight lamp bar.
The backlight power supply circuit that the utility model proposes, detect the power switch signal that sends from mainboard by control module, when this power switch signal is high level, control module work, and control resonant transformation module normal operation, the resonant transformation module is carried out conversion to the PFC supply power voltage of PFC power supply circuits output in supply unit, and the output constant current driving voltage powers to backlight lamp bar, with constant current, drives backlight lamp bar; When this power switch signal was low level, control module was not worked, thus the resonant transformation module do not work, cut off the output of constant current driving voltage, no longer to backlight lamp bar, power.Backlight power supply circuit of the present utility model, undertaken powering to backlight lamp bar after conversion by the PFC supply power voltage of resonant transformation module to the output of PFC power supply circuits, only need this one-level conversion through the resonant transformation module just can power to backlight lamp bar, effectively improve the energy efficiency of backlight power supply circuit, improve the energy efficiency of supply unit, also simplify circuit structure, reduce the power supply cost of backlight lamp bar, and then the energy efficiency of raising television set, power consumption and the cost of reduction television set.
Description of drawings
Fig. 1 is the theory diagram of the utility model backlight power supply circuit preferred embodiment;
Fig. 2 is the electrical block diagram of the utility model backlight power supply circuit preferred embodiment;
Fig. 3 is the theory diagram of the utility model supply unit preferred embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage, in connection with embodiment, and be described further with reference to accompanying drawing.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of backlight power supply circuit.
With reference to Fig. 1, Fig. 1 is the theory diagram of the utility model backlight power supply circuit 120 preferred embodiments.
In the utility model embodiment, backlight power supply circuit 120 is connected and is connected with backlight lamp bar with mainboard 300 respectively, and with the PFC power supply circuits 110 in supply unit, be connected, backlight lamp bar 200 comprises at least one lamp string, this backlight power supply circuit 120 comprises resonant transformation module 121 and control module 122, resonant transformation module 121 is used for to backlight lamp bar 200 power supplies, and driving backlight lamp bar 200, the power switch signal ON/OFF that control module 122 is used for according to mainboard 300, control 121 work of resonant transformation module, by resonant transformation module 121, to drive backlight lamp bar 200.
Wherein, the detection input of control module 122 is connected with the power switch signal output of mainboard 300, and the output of control module 122 is connected with the control end of resonant transformation module 121; The input of resonant transformation module 121 is connected with the supply power voltage output of PFC power supply circuits 110, and the output of resonant transformation module 121 is connected with the positive pole of backlight lamp bar 200.
In the present embodiment, backlight power supply circuit 120 detects by control module 122 the power switch signal ON/OFF that sends from mainboard 300, when this power switch signal ON/OFF is high level, control module 122 work, and control resonant transformation module 121 normal operations, the PFC supply power voltage of 121 pairs of PFC power supply circuits of resonant transformation module, 110 outputs carries out conversion, and the output constant current driving voltage drives backlight lamp bar 200 to backlight lamp bar 200 power supplies with constant current; When this power switch signal ON/OFF was low level, control module 122 was not worked, thus resonant transformation module 121 do not work, cut off the output of constant current driving voltage, no longer give backlight lamp bar 200 power supplies.
With respect to prior art, backlight power supply circuit 120 of the present utility model is undertaken powering to backlight lamp bar 200 after conversion by the PFC supply power voltage of 121 pairs of PFC power supply circuits of resonant transformation module, 110 outputs, only needing just can be to backlight lamp bar 200 power supply through 121 these one-level conversion of resonant transformation module, effectively improve the energy efficiency of backlight power supply circuit 120, improve the energy efficiency of supply unit, also simplify circuit structure, reduce the power supply cost of backlight lamp bar 200, and then the energy efficiency of raising television set, power consumption and the cost of reduction television set.
In above-described embodiment, backlight power supply circuit 120 also comprises voltage protection module 123, this voltage protection module 123 for detection of and feed back the voltage of backlight lamp bar 200; The input of voltage protection module 123 is connected with the positive pole of backlight lamp bar 200, and the output of voltage protection module 123 is connected with the voltage protection input of control module 122.
in the television set course of normal operation, voltage protection module 123 detects the voltage of each lamp string in backlight lamp bar 200, namely detect the constant current driving voltage of resonant transformation module 121 to each lamp string output, and the voltage detecting value is fed back to control module 122, control module 122 judges whether overvoltage of voltage in backlight lamp bar 200 according to this voltage detecting value, if the voltage in backlight lamp bar 200 does not surpass the threshold voltage that control module 122 sets, judge that the voltage in backlight lamp bar 200 is normal, control module 122 normal operations, and control resonant transformation module 121 normal output constant current driving voltages, to continue to drive backlight lamp bar 200, if the voltage in backlight lamp bar 200 surpasses the threshold voltage that control module 122 sets, judge the electric voltage over press in backlight lamp bar 200, control module 122 is not worked, thereby resonant transformation module 121 is not worked, cut off the output of constant current driving voltage, realize overvoltage protection.
Further, backlight power supply circuit 120 also comprises current feedback module 124, and this current feedback module 124 is used for adjusting and feeding back the electric current of backlight lamp bar 200; The input of current feedback module 124 is connected with the negative pole of backlight lamp bar 200, and the output of current feedback module 124 is connected with the current feedback input of control module 122.
In the television set course of normal operation, electric current in each lamp string of 124 pairs of backlight lamp bars 200 of current feedback module is taken a sample, and the current sampling value is fed back to control module 122, can adjust the electric current of backlight lamp bar 200 by current feedback module 124, to regulate the luminosity of backlight lamp bar 200.
See figures.1.and.2 in the lump, wherein Fig. 2 is the electrical block diagram of the utility model backlight power supply circuit 120 preferred embodiments.
In above-described embodiment, backlight lamp bar 200 comprises the first lamp string (not shown) and the second lamp string (not shown), the present embodiment only, is not limited to backlight lamp bar 200 and comprises the first lamp string, the second lamp string two street lamp strings as example describes take the first lamp string, the second lamp string two street lamp strings in backlight lamp bar 200.
Wherein, the anode of the first diode D1 is connected with the anodal LB1+ of the first lamp string via the first resistance R 1, and the anode of the first diode D1 is via the second resistance R 2 ground connection, and the negative electrode of the first diode D1 is connected with the voltage protection input of control module 122 via the 5th resistance R 5; The anode of the second diode D2 is connected with the anodal LB2+ of the second lamp string via the 3rd resistance R 3; and the anode of the second diode D2 is via the 4th resistance R 4 ground connection, and the negative electrode of the second diode D2 is connected with the voltage protection input of control module 122 via the 5th resistance R 5.
Particularly, current feedback module 124 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9; The 6th resistance R 6, the 7th resistance R 7 and the first common port after the 8th resistance R 8 is parallel with one another are connected with the negative pole LB-of backlight lamp bar 200, and be connected the second common end grounding after the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8 are parallel with one another with the current feedback input of control module 122 via the 9th resistance R 9.
In above-described embodiment, control module 122 comprises operating voltage input V_IN, main control chip U1, the first transformer T1, the 3rd diode D3 and the 4th diode D4.
wherein, the energization pins VCC of main control chip U1 is connected with operating voltage input V_IN, the enable pin STD of main control chip U1 is connected with the power switch signal output V_N/F of mainboard 300, the signal ground pin GND of main control chip U1 and the equal ground connection of power supply ground pin PGND, the current feedback input pin IS of main control chip U1 is via the 9th resistance R 9 and the 6th resistance R 6, the 7th resistance R 7 connects with the first common port after the 8th resistance R 8 is parallel with one another, the voltage protection input pin VS of main control chip U1 via the 5th resistance R 5 respectively with the negative electrode of the first diode D1 be connected the negative electrode of diode D2 and be connected, the first driver output pin N1 of main control chip U1 is connected with the first pin 1 of the first transformer T1, the second driver output pin N2 of main control chip U1 is connected with the crus secunda 2 of the first transformer T1, the 6th pin 6 of the first transformer T1 is connected with resonant transformation module 121 via the 3rd diode D3, the 4th pin 4 of the first transformer T1 is connected with resonant transformation module 121 via the 4th diode D4, the 5th pin 5 of the first transformer T1 is connected with resonant transformation module 121, tripod 3 ground connection of the first transformer T1.
Particularly, control module 122 also comprises voltage stabilizing didoe ZD1, the first triode Q1, the second triode Q2, the 3rd triode Q3, the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17, the 18 resistance R 18, the 19 resistance R 19, the 20 resistance R 20, the 21 resistance R 21, the first capacitor C 1, the second capacitor C 2.In the present embodiment, the first triode Q1 is NPN type triode, and the second triode Q2 and the 3rd triode Q3 are the positive-negative-positive triode.
Wherein, an end of the 11 resistance R 11 is connected with the enable pin STD of main control chip U1, and is connected the other end ground connection of the 11 resistance R 11 with the power switch signal output V_N/F of mainboard 300 via the tenth resistance R 10; The first capacitor C 1 is in parallel with the 11 resistance R 11; The plus earth of voltage stabilizing didoe ZD1, the negative electrode of voltage stabilizing didoe ZD1 is connected with the base stage of the first triode Q1, and via the 12 resistance R 12, with operating voltage input V_IN, is connected; The collector electrode of the first triode Q1 is connected with operating voltage input V_IN via the 13 resistance R 13, and the emitter of the first triode Q1 is connected with the energization pins VCC of main control chip U1, and via the second capacitor C 2 ground connection; The 14 resistance R 14 is connected between the first pin 1 of the first driver output pin N1 of main control chip U1 and the first transformer T1, and the 15 resistance R 15 is connected between the crus secunda 2 of the second driver output pin N2 of main control chip U1 and the first transformer T1; One end of the 16 resistance R 16 is connected with the negative electrode of the 3rd diode D3, the other end of the 16 resistance R 16 is connected with the emitter of the second triode Q2, and be connected with the 5th pin 5 of the first transformer T1 via the 17 resistance R 17, the other end of the 16 resistance R 16 also is connected to resonant transformation module 121; The base stage of the second triode Q2 is connected with the 6th pin 6 of the first transformer T1 via the 18 resistance R 18, and the collector electrode of the second triode Q2 is connected with the 5th pin 5 of the first transformer T1; One end of the 19 resistance R 19 is connected with the negative electrode of the 4th diode D4, the other end of the 19 resistance R 19 is connected with the emitter of the 3rd triode Q3, and be connected with the tripod 3 of the first transformer T1 via the 20 resistance R 20, the other end of the 19 resistance R 19 also is connected to resonant transformation module 121; The base stage of the 3rd triode Q3 is connected with the 6th pin 6 of the first transformer T1 via the 21 resistance R 21, and the collector electrode of the 3rd triode Q3 is connected with the tripod 3 of the first transformer T1.
In above-described embodiment, resonant transformation module 121 comprises the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the second transformer T2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 5th diode D5, the 6th diode D6, the 7th diode D7 and the 8th diode D8.In the present embodiment, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 are the NMOS pipe; The 3rd capacitor C 3 is the primary resonant electric capacity of the second transformer T2, and the 4th capacitor C 4 is the secondary resonance electric capacity of the second transformer T2, by the second transformer T2, the 3rd capacitor C 3 and the 4th capacitor C 4, forms a LLC controlled resonant converter.
Wherein, the grid of the first metal-oxide-semiconductor M1 is connected with the common port of the 17 resistance R 17 with the 16 resistance R 16, the drain electrode of the first metal-oxide-semiconductor M1 is connected with the supply power voltage output V_PFC of PFC power supply circuits 110, the source electrode of the first metal-oxide-semiconductor M1 respectively with the drain electrode of the 5th pin 5 of the first transformer T1, the second metal-oxide-semiconductor M2 be connected the primary input terminal a of transformer T2 and be connected; The grid of the second metal-oxide-semiconductor M2 is connected with the common port of the 20 resistance R 20 with the 19 resistance R 19, and the source electrode of the second metal-oxide-semiconductor M2 is connected with the tripod 3 of the first transformer T1, and via the 3rd capacitor C 3, with the primary output terminal b of the second transformer T2, is connected; The anode of the 5th diode D5 is connected with secondary the first output c of the second transformer T2 via the 4th capacitor C 4, and the negative electrode of the 5th diode D5 is connected with the anodal LB1+ of the first lamp string, and via the 5th capacitor C 5 ground connection; The negative electrode of the 6th diode D6 is connected with secondary the first output c of the second transformer T2, the plus earth of the 6th diode D6; The anode of the 7th diode D7 is connected with secondary the second output d of the second transformer T2, and the negative electrode of the 7th diode D7 is connected with the anodal LB2+ of the second lamp string, and via the 6th capacitor C 6 ground connection; The negative electrode of the 8th diode D8 is connected with secondary the second output d of the second transformer T2, the plus earth of the 8th diode D8.
What deserves to be explained is, the secondary winding that the second transformer T2 only is shown in Fig. 2 is connected to the anodal LB1+ of the first lamp string and the anodal LB2+ of the second lamp string, give the first lamp string and the second lamp statements based on collusion electricity, in backlight lamp bar 200, other lamp strings are all identical with the connected mode of the secondary winding of the second transformer T2, when in backlight lamp bar 200, lamp string quantity increases, only need the quantity of the secondary winding of increase the second transformer T2 to get final product, the present embodiment does not describe one by one.
As shown in Figure 2, the operation principle of the utility model backlight power supply circuit 120 specifically describes as follows:
When television boot-strap works, the mainboard 300 of television set sends the power switch signal ON/OFF of high level to control module 122, this power switch signal ON/OFF exports the enable pin STD of main control chip U1 to through the tenth resistance R 10, enable pin STD to main control chip U1 enables, simultaneously, export the energization pins VCC of main control chip U1 to from the 12V voltage of operating voltage input V_IN input after voltage stabilizing didoe ZD1 voltage stabilizing, U1 provides operating voltage for main control chip, and main control chip U1 starts work.In the utility model embodiment; main control chip U1 preferably adopts the BD9211F chip; but be not limited to the BD9211F chip; has other chip of equivalent function also all in scope of patent protection of the present utility model; the utility model embodiment is according to the characteristic of BD9211F chip; the enable pin STD of main control chip U1 is effective to high level, when namely power switch signal ON/OFF is high level, just the enable pin STD of main control chip U1 is enabled.
after main control chip U1 normal operation, from the first driver output pin N1 of main control chip U1 and the first pin 1 and the crus secunda 2 of the second driver output pin N2 voltage signal to the first transformer T1 that output phase is opposite respectively, if the voltage on the first pin 1 of the first transformer T1 is for just, voltage on the crus secunda 2 of the first transformer T1 is for negative, the voltage of the 6th pin 6 output of the first transformer T1 is for just, this positive voltage is added to the grid of the first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 conducting, the voltage of the 4th pin 4 outputs of the first transformer T1 is for negative, this negative voltage is added to the grid of the second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 still ends, if the voltage on the first pin 1 of the first transformer T1 is for negative, voltage on the crus secunda 2 of the first transformer T1 is for just, the voltage of the 6th pin 6 outputs of the first transformer T1 is for negative, this positive voltage is added to the grid of the first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 cut-off, the voltage of the 4th pin 4 output of the first transformer T1 is for just, and this positive voltage is added to the grid of the second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 conducting.
In the first metal-oxide-semiconductor M1 conducting, during the situation of the second metal-oxide-semiconductor M2 cut-off, PFC supply power voltage from the supply power voltage output V_PFC of PFC power supply circuits 110 output, export the primary input terminal a of the second transformer T2 through the first metal-oxide-semiconductor M1 to, and through the armature winding of the second transformer T2, give the 3rd capacitor C 3 chargings.After the LLC controlled resonant converter that is comprised of the second transformer T2, the 3rd capacitor C 3 and the 4th capacitor C 4 carries out resonant transformation to the PFC supply power voltage, secondary the first output c and secondary the second opposite induced voltage of output d output phase at the second transformer T2, be the induced voltage of secondary the first output c output with respect to the induced voltage of secondary the second output d output for just, the induced voltage of secondary the second output d output with respect to the induced voltage of secondary the first output c output for bearing.
in the first metal-oxide-semiconductor M1 cut-off, during the situation of the second metal-oxide-semiconductor M2 conducting, due to the first metal-oxide-semiconductor M1 cut-off, therefore cut off PFC power supply circuits 110 to the second transformer T2 output PFC supply power voltage, due to the second metal-oxide-semiconductor M2 conducting, the armature winding of the second transformer T2, the 3rd capacitor C 3 and the second metal-oxide-semiconductor M2 form loop, the 3rd capacitor C 3 discharges, the electric current that flows through the armature winding of the second transformer T2 flows to primary input terminal a from primary output terminal b, phase place at the induced voltage of the first output c and secondary the second output d output is exchanged, be the induced voltage of secondary the first output c output with respect to the induced voltage of secondary the second output d output for negative, the induced voltage of secondary the second output d output with respect to the induced voltage of secondary the first output c output for just.
In above-mentioned two situations, the induced voltage of secondary the first output c output of the second transformer T2 is after the rectifying and wave-filtering of the 5th diode D5, the 6th diode D6 and the 5th capacitor C 5 is processed, be converted to the output of constant current driving voltage, namely at the constant current driving voltage of the positive pole place of the 5th capacitor C 5 output, being output to the anodal LB1+ of the first lamp string, is the first lamp statements based on collusion electricity; The induced voltage of secondary the second output d output of the second transformer T2 is after the rectifying and wave-filtering of the 7th diode D7, the 8th diode D8 and the 6th capacitor C 6 is processed, be converted to the output of constant current driving voltage, namely at the constant current driving voltage of the positive pole place of the 6th capacitor C 6 output, being output to the anodal LB2+ of the second lamp string, is the second lamp statements based on collusion electricity.In like manner, in backlight lamp bar 200, the power supply the principle of other lamp strings is with reference to above-mentioned principle, and in the secondary winding of the second transformer T2, each secondary first output c or secondary the second output d correspondence are exported a road constant current driving voltage, the corresponding street lamp string that drives.
In voltage protection module 123; carry out dividing potential drop by the voltage in the first resistance R 1 and 2 pairs of the first lamp strings of the second resistance R; i.e. the voltage that detects in the first lamp strings by the first resistance R 1 and the second resistance R 2; when the threshold voltage that sets on the voltage protection input pin VS of the voltage on the second resistance R 2 greater than main control chip U1; voltage in main control chip U1 judgement the first lamp string is overvoltage condition; quit work; cut off the secondary output of the second transformer T2; and then cut off the output of constant current driving voltage, realize overvoltage protection.in like manner, carry out dividing potential drop by the voltage in the 3rd resistance R 3 and 4 pairs of the second lamp strings of the 4th resistance R, i.e. the voltage that detects in the second lamp strings by the 3rd resistance R 3 and the 4th resistance R 4, when the threshold voltage that sets on the voltage protection input pin VS of the voltage on the 4th resistance R 4 greater than main control chip U1, voltage in main control chip U1 judgement the second lamp string is overvoltage condition, quit work, cut off the secondary output of the second transformer T2, and then the output of cut-out constant current driving voltage, realize overvoltage protection, therefore by setting the first resistance R 1 and the second resistance R 2, the resistance of the 3rd resistance R 3 and the 4th resistance R 4 can be set overvoltage protection.
In current feedback module 124, take a sample by the electric current in the 6th resistance R 6, the 7th resistance R 7 and 8 pairs of backlight lamp bars 200 of the 8th resistance R, by regulating the resistance of the 6th resistance R 6 parallel with one another, the 7th resistance R 7 and the 8th resistance R 8, can adjust the size of current in backlight lamp bar 200, to be adjusted to required backlight illumination.
when TV standby or shutdown, mainboard 300 sends low level power switch signal ON/OFF to control module 122, this power switch signal ON/OFF exports the enable pin STD of main control chip U1 to through the tenth resistance R 10, the enabling of the enable pin STD of main control chip U1 closed, main control chip U1 does not work, the first pin 1 and the crus secunda 2 of the first driver output pin N1 of main control chip U1 and the second driver output pin N2 voltage signal to the first transformer T1 that no longer output phase is opposite, the 6th pin 6 of the first transformer T1 and the 4th pin 4 all do not have induced voltage output, thereby the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 all end, the PFC supply power voltage no longer exports the primary input terminal b of the second transformer T2 to, secondary the first output c of the second transformer T2 and secondary the second output d do not have induced voltage output, thereby do not have the constant current driving voltage to export to drive backlight lamp bar 200, backlight lamp bar 200 is not luminous.
Backlight power supply circuit 120 of the present utility model, the second transformer T2 in resonant transformation module 121, the 3rd capacitor C 3 and the 4th capacitor C 4 form a LLC controlled resonant converter, by the second transformer T2, the PFC supply power voltage of PFC power supply circuits 110 outputs are carried out powering to backlight lamp bar 200 after conversion.With respect to will just giving backlight lamp bar 200 power supplies after Two Stages in prior art, 120, backlight power supply circuit of the present utility model needs just can be to backlight lamp bar 200 power supplies through this one-level conversion of the second transformer T2 in resonant transformation module 121.Therefore, with respect to prior art, the utility model improves the energy efficiency of backlight power supply circuit 120 effectively, improve the energy efficiency of supply unit, also simplify circuit structure, reduce the power supply cost of backlight lamp bar 200, and then the energy efficiency of raising television set, power consumption and the cost of reduction television set.
The utility model also proposes a kind of supply unit.
Referring to figs. 1 through Fig. 3, wherein Fig. 3 is the theory diagram of the utility model supply unit 100 preferred embodiments.
In the present embodiment, supply unit 100 is connected and is connected with backlight lamp bar with mainboard 300 respectively, this backlight lamp bar 200 comprises at least one lamp bar string, supply unit 100 comprises AC power 130, PFC power supply circuits 110, movement power supply circuits 140 and standby power supply circuits 150, also comprises backlight power supply circuit 120; The circuit structure of this backlight power supply circuit 120, operation principle and the beneficial effect that brings, all with reference to above-described embodiment, repeat no more herein.
The utility model further also proposes a kind of television set, and this television set comprises mainboard 300, backlight lamp bar 200 and supply unit 100, and the structure of this supply unit 100, operation principle and the beneficial effect that brings, all with reference to above-described embodiment, repeat no more herein.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.
Claims (10)
1. backlight power supply circuit, be connected with backlight lamp bar with mainboard respectively, and with the PFC power supply circuits in supply unit, be connected, described backlight lamp bar comprises at least one lamp string, it is characterized in that, described backlight power supply circuit comprises be used to the resonant transformation module that drives described backlight lamp bar, and comprises the control module of controlling the work of described resonant transformation module for the power switch signal according to described mainboard; Wherein,
The detection input of described control module is connected with the power switch signal output of described mainboard, and the output of described control module is connected with the control end of described resonant transformation module; The input of described resonant transformation module is connected with the supply power voltage output of described PFC power supply circuits, and the output of described resonant transformation module is connected with the positive pole of described backlight lamp bar.
2. backlight power supply circuit as claimed in claim 1, is characterized in that, described backlight power supply circuit also comprises for detection of and feed back the voltage protection module of the voltage of described backlight lamp bar; The input of described voltage protection module is connected with the positive pole of described backlight lamp bar, and the output of described voltage protection module is connected with the voltage protection input of described control module.
3. backlight power supply circuit as claimed in claim 2, it is characterized in that, described backlight lamp bar comprises the first lamp string and the second lamp string, and described voltage protection module comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first diode and the second diode; Wherein,
The anode of described the first diode is connected with the positive pole of described the first lamp string via described the first resistance, and via described the second grounding through resistance, the negative electrode of described the first diode is connected with the voltage protection input of described control module via described the 5th resistance; The anode of described the second diode is connected with the positive pole of described the second lamp string via described the 3rd resistance, and via described the 4th grounding through resistance, the negative electrode of described the second diode is connected with the voltage protection input of described control module via described the 5th resistance.
4. backlight power supply circuit as claimed in claim 3, is characterized in that, described backlight power supply circuit also comprises for the current feedback module of adjusting and feed back the electric current of described backlight lamp bar; The input of described current feedback module is connected with the negative pole of described backlight lamp bar, and the output of described current feedback module is connected with the current feedback input of described control module.
5. backlight power supply circuit as claimed in claim 4, is characterized in that, described current feedback module comprises the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance; The first common port after described the 6th resistance, described the 7th resistance and the 8th resistance of being connected are parallel with one another is connected with the negative pole of described backlight lamp bar, and be connected the second common end grounding after described the 6th resistance, described the 7th resistance and described the 8th resistance are parallel with one another with the current feedback input of described control module via described the 9th resistance.
6. backlight power supply circuit as claimed in claim 5, is characterized in that, described control module comprises operating voltage input, main control chip, the first transformer, the 3rd diode and the 4th diode; Wherein,
the energization pins of described main control chip is connected with described operating voltage input, the enable pin of described main control chip is connected with the power switch signal output of described mainboard, the signal ground pin of described main control chip and the equal ground connection of power supply ground pin, the current feedback input pin of described main control chip is via described the 9th resistance and described the 6th resistance, described the 7th resistance be connected first common port of the 8th resistance after parallel with one another and connect, the voltage protection input pin of described main control chip via described the 5th resistance respectively with the negative electrode of described the first diode be connected the negative electrode of the second diode and be connected, the first driver output pin of described main control chip, the second driver output pin respectively with the first pin of described the first transformer, crus secunda is corresponding to be connected, the 6th pin of described the first transformer all is connected with described resonant transformation module via described the 4th diode and the 5th pin via described the 3rd diode, the 4th pin, the tripod ground connection of described the first transformer.
7. backlight power supply circuit as claimed in claim 6, it is characterized in that, described control module also comprises voltage stabilizing didoe, the first triode, the second triode, the 3rd triode, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the first electric capacity, the second electric capacity; Wherein,
One end of described the 11 resistance is connected with the enable pin of described main control chip, and is connected the other end ground connection of described the 11 resistance with the power switch signal output of described mainboard via described the tenth resistance; Described the first electric capacity is in parallel with described the 11 resistance; The plus earth of described voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the base stage of described the first triode, and via described the 12 resistance, with described operating voltage input, is connected; The collector electrode of described the first triode is connected with described operating voltage input via described the 13 resistance, and the emitter of described the first triode is connected with the energization pins of described main control chip, and via described the second capacity earth; Described the 14 resistance is connected between the first pin of the first driver output pin of described main control chip and described the first transformer, and described the 15 resistance is connected between the crus secunda of the second driver output pin of described main control chip and described the first transformer; One end of described the 16 resistance is connected with the negative electrode of described the 3rd diode, the other end of described the 16 resistance is connected with the emitter of described the second triode, and be connected with the 5th pin of described the first transformer via described the 17 resistance, the other end of described the 16 resistance also is connected to described resonant transformation module; The base stage of described the second triode is connected with the 6th pin of described the first transformer via described the 18 resistance, and its collector electrode is connected with the 5th pin of described the first transformer; One end of described the 19 resistance is connected with the negative electrode of described the 4th diode, the other end of described the 19 resistance is connected with the emitter of described the 3rd triode, and be connected with the tripod of described the first transformer via described the 20 resistance, the other end of described the 19 resistance also is connected to described resonant transformation module; The base stage of described the 3rd triode is connected with the 6th pin of described the first transformer via described the 21 resistance, and its collector electrode is connected with the tripod of described the first transformer.
8. backlight power supply circuit as claimed in claim 7, it is characterized in that, described resonant transformation module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the second transformer, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 5th diode, the 6th diode, the 7th diode and the 8th diode; Wherein,
The grid of described the first metal-oxide-semiconductor and described the 16 resistance be connected the common port of the 17 resistance and be connected, the drain electrode of described the first metal-oxide-semiconductor is connected with the supply power voltage output of described PFC power supply circuits, the source electrode of described the first metal-oxide-semiconductor respectively with the drain electrode of the 5th pin of described the first transformer, described the second metal-oxide-semiconductor be connected the primary input terminal of the second transformer and be connected; The grid of described the second metal-oxide-semiconductor and described the 19 resistance be connected the common port of the 20 resistance and be connected, the source electrode of described the second metal-oxide-semiconductor is connected with the tripod of described the first transformer, and via the 3rd electric capacity, with the primary output terminal of described the second transformer, is connected; The anode of described the 5th diode is connected with secondary first output of described the second transformer via described the 4th electric capacity, and the negative electrode of described the 5th diode is connected with the positive pole of described the first lamp string, and via described the 5th capacity earth; The negative electrode of described the 6th diode is connected with secondary first output of described the second transformer, the plus earth of described the 6th diode; The anode of described the 7th diode is connected with secondary second output of described the second transformer, and the negative electrode of described the 7th diode is connected with the positive pole of described the second lamp string, and via described the 6th capacity earth; The negative electrode of described the 8th diode is connected with secondary second output of described the second transformer, the plus earth of described the 8th diode.
9. supply unit, be connected with backlight lamp bar with mainboard respectively, comprise AC power, PFC power supply circuits, movement power supply circuits and standby power supply circuits, described backlight lamp bar comprises at least one lamp bar string, it is characterized in that, described supply unit also comprises the described backlight power supply circuit of any one in claim 1 to 8; Described backlight power supply circuit respectively with described mainboard be connected backlight lamp bar and be connected, and with described PFC power supply circuits, be connected, described PFC power supply circuits respectively with described AC power be connected the movement power supply circuits and be connected, described movement power supply circuits are connected with described mainboard, and described standby power supply circuits are connected between described movement power supply circuits and described mainboard.
10. a television set, comprise mainboard and backlight lamp bar, and described backlight lamp bar comprises at least one lamp bar string, it is characterized in that, described television set also comprises supply unit claimed in claim 9, described supply unit respectively with described mainboard be connected backlight lamp bar and be connected.
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