CN104935843A - LED (Light-Emitting Diode) television two-in-one power supply circuit and LED television - Google Patents
LED (Light-Emitting Diode) television two-in-one power supply circuit and LED television Download PDFInfo
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- CN104935843A CN104935843A CN201510332014.8A CN201510332014A CN104935843A CN 104935843 A CN104935843 A CN 104935843A CN 201510332014 A CN201510332014 A CN 201510332014A CN 104935843 A CN104935843 A CN 104935843A
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Abstract
The invention discloses an LED (Light-Emitting Diode) television two-in-one power supply circuit and an LED television. The LED television two-in-one power supply circuit comprises a rectifying and filtering module, a PFC (Positive Feedback Circuit) module, a reverse excitation circuit module, an LLC (Logical Link Control) half-bridge resonant module, a constant-current module, a feedback module and an LLC control module. Alternating current is partitioned into two paths after being rectified and filtered and corrected by the PFC module; one path is used for supplying power to a motherboard core through the reverse excitation circuit module; and the other path is used for supplying power to an LED light bar through the LLC half-bridge resonant module. Power is supplied separately with two paths since voltages needed by the LED light bar and the motherboard core are different, so that the power supply efficiency is increased, and the element cost is lowered. The LLC control module is fed back to the primary stage of an LLC transformer of the LLC half-bridge resonant module, so that the resonant groove state is monitored in real time, and complete protection is realized. Moreover, the transformer does not need to be driven, so that the quantity of safety devices is small.
Description
Technical field
The present invention relates to Switching Power Supply and LED drive circuit field, particularly a kind of LED television two-in-one electric source circuit and LED television.
Background technology
Existing typical high power TV power supply, its main board power supply and backlight drive, export the stable voltage of two-way by a LLC circuit: 12V is to mainboard and liquid-crystalline glasses, 24V or other voltage are as the input voltage of LED constant current backlight drive part, and LED constant current drives the electric current needed for Boost circuit voltage increase and current constant to LED lamp bar.
Concrete grammar as shown in Figure 1, through over commutation filtering and PFC circuit after alternating current input, export two-way voltage through LLC half-bridge resonance, a road 12V directly supplies power to mainboard core section, and another one intermediate voltage is powered and to be used to LED lamp bar after Boost boosting and constant current.This conventional method, because backlight drive part is through one-level Boost boosting, loss is serious, and whole efficiency is low, and because of device more, cost is high.
Thus prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of LED television two-in-one electric source circuit and LED television, efficiently solve that LED television power circuit efficiency is low, cost is high, cannot protect the problem of the device on former limit.
In order to achieve the above object, this invention takes following technical scheme:
A kind of LED television two-in-one electric source circuit, comprises rectification filtering module, PFC module, circuit of reversed excitation module, LLC half-bridge resonance module, constant flow module, feedback module and LLC control module;
Alternating current is carried out rectification and filtering by described rectification filtering module, exports to PFC module; Described PFC module carries out power factor correction to the direct current after rectifying and wave-filtering, and exports to LLC half-bridge resonance module and circuit of reversed excitation module; Described LLC half-bridge resonance module is powered to LED lamp bar; Described constant flow module the sampling electric current of LED lamp bar, the parameter according to this Current adjustment feedback module, make LLC control module feed back to the elementary of the LLC transformer of LLC half-bridge resonance module, make the current constant of LED lamp bar; The voltage of described circuit of reversed excitation module stable output is powered to mainboard movement.
In described LED television two-in-one electric source circuit, LLC half-bridge resonance module comprises:
LLC metal-oxide-semiconductor unit, for the output signal according to LLC control module, the break-make of control LLC transformer;
LLC transformer, for step-down also for LED lamp bar is powered;
First rectification filtering unit, carries out rectifying and wave-filtering for the voltage inputted LLC transformer, and exports to described LED lamp bar;
Described LLC control module connects described LLC transformer by described LLC metal-oxide-semiconductor unit, and described LLC transformer connects described LED lamp bar by described first rectification filtering unit.
In described LED television two-in-one electric source circuit, described LLC metal-oxide-semiconductor unit comprises the first metal-oxide-semiconductor and the second metal-oxide-semiconductor; The drain electrode of described first metal-oxide-semiconductor connects one end of the output of PFC module and the armature winding of described LLC transformer, the source electrode of described first metal-oxide-semiconductor connects the other end of the armature winding of described LLC transformer and the drain electrode of the second metal-oxide-semiconductor, and the grid level of described first metal-oxide-semiconductor connects described LLC control module; The grid of described second metal-oxide-semiconductor connects described LLC control module, the source ground of described second metal-oxide-semiconductor.
In described LED television two-in-one electric source circuit, described constant flow module comprises constant current constant voltage control chip, the first resistance, the second resistance and the 3rd resistance; One end of described first resistance be described constant flow module voltage input end, connect the output of the first rectification filtering unit and the positive pole of LED lamp bar, the other end of described first resistance connects the VSENSE end of constant current constant voltage control chip, also by the second grounding through resistance; One end of described 3rd resistance is the ISENSE end of the current input terminal of described constant flow module, the negative pole connecting LED lamp bar and constant current constant voltage control chip, the other end ground connection of described 3rd resistance; The VCC end of described constant current constant voltage control chip connects the output of described circuit of reversed excitation module, and the FB end of described constant current constant voltage control chip connects the input of described feedback module, and the GND end of described constant current constant voltage control chip and Ictrl hold ground connection.
In described LED television two-in-one electric source circuit, described feedback module comprises the first optocoupler, the 4th resistance and the 5th resistance; One end of described 4th resistance be described feedback module input, connect the FB end of described constant current constant voltage control chip, the other end of described 4th resistance connects the second end of described first optocoupler, and the first end of described first optocoupler connects the output of described circuit of reversed excitation module; 3rd end ground connection of described first optocoupler, the 4th end of described first optocoupler connects one end of the 5th resistance, and the other end of described 5th resistance is the output of described feedback module, the first input end connecting described LLC control module.
In described LED television two-in-one electric source circuit, described power circuit also comprises light-adjusting module, and described light-adjusting module, according to pwm signal, is controlled the output of described LLC half-bridge resonance module, realizes the light modulation to LED lamp bar by described LLC control module.
In described LED television two-in-one electric source circuit, described LLC control module comprises LLC control chip, the first diode and the first electric capacity; The VCC end of described LLC control chip connects externally fed end; The positive pole of described first diode connects the VCC end of externally fed end and described LLC control chip, the negative pole of described first diode connects the Vboot end of described LLC control chip and one end of the first electric capacity, and the other end of described first electric capacity connects the Mup end of described LLC control chip and the grid of the first metal-oxide-semiconductor; The HB of described LLC control chip holds the source electrode of connection first metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor and the other end of LLC primary winding; The Mlow end of described LLC control chip connects the grid of described second metal-oxide-semiconductor; The RT end of described LLC control chip is the first input end of LLC control module, the other end of connection the 5th resistance; The second input that the BO end of described LLC control chip is LLC control module, connect described light-adjusting module, the GND of described LLC control chip holds ground connection.
In described LED television two-in-one electric source circuit, described light-adjusting module comprises the 6th resistance, the 7th resistance, the 8th resistance, the second diode, the second optocoupler and the first triode: one end of described 6th resistance is connected the output of described circuit of reversed excitation module, the other end of described 6th resistance connects the first end of the second optocoupler, second end of described second optocoupler connects the collector electrode of the first triode, the grounded emitter of described first triode; 3rd end ground connection of described second optocoupler, the 4th end of described second optocoupler connects the BO end of described LLC control chip; The input of the just very described light-adjusting module of described second diode, connect PWM dim signal providing end, the negative pole of described second diode by the 7th resistance connect the first triode base stage, also by the 8th grounding through resistance.
In described LED television two-in-one electric source circuit, described circuit of reversed excitation module comprises:
Switching tube unit, for controlling the break-make of flyback transformer;
Flyback transformer, for the voltage of voltage transitions needed for described mainboard movement PFC module exported;
Second rectification filtering unit, carries out rectifying and wave-filtering for the voltage inputted flyback transformer, and exports to described mainboard movement;
Feedback unit, for gathering the voltage of described mainboard movement, and exports to flyback controller;
Flyback controller, for the voltage fed back according to feedback unit, the voltage stabilizing being realized circuit of reversed excitation module by the break-make of control switch pipe unit is exported;
Described PFC module connects one end of described flyback transformer armature winding, the other end of described flyback transformer armature winding connects the output of described switching tube unit, and the secondary winding of described flyback transformer connects described feedback unit, also connects described mainboard movement by described second rectification filtering unit; Described feedback unit connects the input of described switching tube unit by described flyback controller.
A kind of LED television, comprises LED television two-in-one electric source circuit as above.
Compared to prior art, LED television two-in-one electric source circuit provided by the invention and LED television, alternating current, after rectifying and wave-filtering and PFC module correct, is divided into two-way, one tunnel powers to mainboard movement through circuit of reversed excitation module, and LLC half-bridge resonance module of separately leading up to is powered to LED lamp bar.Because LED lamp bar is different with mainboard movement required voltage, adopt two-way separately power supply, improve power supplying efficiency, reduce former device cost.LLC control module is fed back to the elementary of the LLC transformer of LLC half-bridge resonance module, Real-Time Monitoring resonant slots state, protects complete.And the present invention is without the need to driving transformer, and the number of safety device is few.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of existing LED television power circuit.
Fig. 2 is the structured flowchart of LED television two-in-one electric source circuit provided by the invention.
Fig. 3 is in LED television two-in-one electric source circuit provided by the invention, the circuit diagram of rectification filtering module and PFC module.
Fig. 4 is in LED television two-in-one electric source circuit provided by the invention, the circuit diagram of LLC half-bridge resonance module, constant flow module, feedback module and LLC control module.
Fig. 5 is in LED television two-in-one electric source circuit provided by the invention, the circuit diagram of circuit of reversed excitation module.
Embodiment
The invention provides a kind of LED television two-in-one electric source circuit and LED television.For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 2, LED television two-in-one electric source circuit provided by the invention, comprise rectification filtering module 10, PFC module 20, circuit of reversed excitation module 80, LLC half-bridge resonance module 30, constant flow module 50, feedback module 60 and LLC control module 70.
Alternating current is carried out rectification and filtering by described rectification filtering module 10, exports to PFC module 20; Direct current after described PFC module 20 pairs of rectifying and wave-filterings carries out power factor correction, and exports to LLC half-bridge resonance module 30 and circuit of reversed excitation module 80; Described LLC half-bridge resonance module 30 powers to LED lamp bar 40; Described constant flow module 50 is sampled the electric current of LED lamp bar 40, the parameter according to this Current adjustment feedback module 60, makes LLC control module 70 feed back to the elementary of the LLC transformer of LLC half-bridge resonance module 30, makes the current constant of LED lamp bar 40; The voltage of described circuit of reversed excitation module 80 stable output is powered to mainboard movement 90.
In other words, described rectification filtering module 10, for carrying out rectification and filtering to the alternating current of input television set.
Described PFC module 20, for carrying out power factor correction to the signal of telecommunication after rectifying and wave-filtering, to improve the power supplying efficiency of power circuit.
Described LLC half-bridge resonance module 30, exports the voltage close with LED lamp bar 40 voltage for LLC resonance.
Described constant flow module 50, for the voltage and current of LED lamp bar 40 of sampling, regulates the parameter of feedback module 60 according to this voltage and current.
Described feedback module 60, for the adjustment according to constant flow module 50, exports high/low level signal to described LLC control module 70.
Described LLC control module 70, for the low and high level signal exported according to feedback module 60, by the break-make of the LLC primary winding of control LLC half-bridge resonance module 30, makes LLC half-bridge resonance module 30 export constant electric current and powers to LED lamp bar 40.
Described circuit of reversed excitation module 80, the 12.2V voltage for stable output is powered to mainboard movement 90.
Owing to adopting LLC half-bridge resonance module 30 to power to LED lamp bar 40, circuit of reversed excitation module 80 powers to mainboard movement 90, makes the power supply of LED lamp bar 40 and mainboard movement 90 separately.LLC half-bridge resonance module 30 can regulate separately for LED lamp bar 40 required voltage (24V or other) electric current; Circuit of reversed excitation module 80 also can be carried out power supply according to the demand of mainboard movement 90 (12.2V) and be regulated, and improves power supplying efficiency, reduces former device cost.And LLC control module 70 is fed back to the elementary of the LLC transformer of LLC half-bridge resonance module 30 by the present invention, and Real-Time Monitoring resonant slots state, protects complete.And the present invention is without the need to driving transformer, and the number of safety device is few.
Further, described LLC half-bridge resonance module 30 comprises: LLC metal-oxide-semiconductor unit 310, LLC transformer 320 and the first rectification filtering unit 330.
Described LLC metal-oxide-semiconductor unit 310, for the output signal according to LLC control module 70, the break-make of control LLC transformer 320.That is, the low and high level signal of described LLC control module 70 specifically for exporting according to feedback module 60, controls the break-make of described LLC transformer 320 armature winding by LLC metal-oxide-semiconductor unit 310.
Described LLC transformer 320, also power for LED lamp bar 40 for step-down, the voltage specifically for PFC module 20 being exported is reduced to the voltage needed for LED lamp bar 40.
Described first rectification filtering unit 330, carries out rectifying and wave-filtering for the voltage inputted LLC transformer 320, and exports to described LED lamp bar 40.
Described LLC control module 70 connects described LLC transformer 320 by described LLC metal-oxide-semiconductor unit 310, and described LLC transformer 320 connects described LED lamp bar 40 by described first rectification filtering unit 330.
Figure 3 shows that the physical circuit figure of rectification filtering module 10 and PFC module 20, it is conventional design, and the present invention does not describe in detail.
Refer to Fig. 4, described LLC metal-oxide-semiconductor unit 310 comprises the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2; The drain electrode of described first metal-oxide-semiconductor Q1 connects one end of the output of PFC module 20 and the armature winding of described LLC transformer 320, the source electrode of described first metal-oxide-semiconductor Q1 connects the other end of the armature winding of described LLC transformer 320 and the drain electrode of the second metal-oxide-semiconductor Q2, and the grid level of described first metal-oxide-semiconductor Q1 connects described LLC control module 70; The grid of described second metal-oxide-semiconductor Q2 connects described LLC control module 70, the source ground of described second metal-oxide-semiconductor Q2.Described first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 is NMOS tube, plays on-off action.Described LLC transformer 320 comprises armature winding L1, one end of described armature winding L1 connects the output V_PFC of PFC module, the other end of described armature winding L1 connects the source electrode of the first metal-oxide-semiconductor Q1 and the drain electrode of the second metal-oxide-semiconductor Q2, therefore the grid that only need control the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 can realize controlling the break-make of LLC transformer 320.
Described constant flow module 50 comprises constant current constant voltage control chip U1, the first resistance R1, the second resistance R2 and the 3rd resistance R3; One end of described first resistance R1 be described constant flow module 50 voltage input end, connect the output of the first rectification filtering unit 330 and the positive pole of LED lamp bar 40, the other end of described first resistance R1 connects the VSENSE end of constant current constant voltage control chip U1, also by the second resistance R2 ground connection; One end of described 3rd resistance R3 is the ISENSE end of the current input terminal of described constant flow module 50, the negative pole connecting LED lamp bar 40 and constant current constant voltage control chip U1, the other end ground connection of described 3rd resistance R3; The VCC end of described constant current constant voltage control chip U1 connects the output of described circuit of reversed excitation module 80, and the FB end of described constant current constant voltage control chip U1 connects the input of described feedback module 60, and the GND end of described constant current constant voltage control chip U1 and Ictrl hold ground connection.Wherein, the model of described constant current constant voltage control chip U1 is N758.
Described feedback module 60 comprises the first optocoupler U2, the 4th resistance R4 and the 5th resistance R5; One end of described 4th resistance R4 be described feedback module 60 input, connect the FB end of described constant current constant voltage control chip U1, the other end of described 4th resistance R4 connects second end 2 of described first optocoupler U2, and the first end 1 of described first optocoupler U2 connects the output of described circuit of reversed excitation module 80; 3rd end 3 ground connection of described first optocoupler U2, the 4th end 4 of described first optocoupler U2 connects one end of the 5th resistance R5, and the other end of described 5th resistance R5 is the output of described feedback module 60, the first input end connecting described LLC control module 70.
Described power circuit also comprises light-adjusting module 100, and described light-adjusting module 100, according to pwm signal, is controlled the output of described LLC half-bridge resonance module 30, realizes the light modulation to LED lamp bar 40 by described LLC control module 70.
Described LLC control module 70 comprises LLC control chip U3, the first diode D1 and the first electric capacity C1; The VCC end of described LLC control chip U3 connects externally fed end VCC; The positive pole of described first diode D1 connects the VCC end of externally fed end VCC and described LLC control chip U3, the negative pole of described first diode D1 connects the Vboot end of described LLC control chip U3 and one end of the first electric capacity C1, and the other end of described first electric capacity C1 connects the Mup end of described LLC control chip U3 and the grid of the first metal-oxide-semiconductor Q1; The HB of described LLC control chip U3 holds the source electrode of connection first metal-oxide-semiconductor Q1, the drain electrode of the second metal-oxide-semiconductor Q2 and the other end of LLC primary winding; The Mlow end of described LLC control chip U3 connects the grid of described second metal-oxide-semiconductor Q2; The RT end of described LLC control chip U3 is the first input end of LLC control module 70, the other end of connection the 5th resistance R5; The second input that the BO end of described LLC control chip U3 is LLC control module 70, connect described light-adjusting module 100, the GND of described LLC control chip U3 holds ground connection.
The electric current of the LED lamp bar 40 that described constant current constant voltage control chip U1 samples according to the voltage of the LED lamp bar 40 of VSENSE end sampling and ISENSE end, the level height that corresponding change feedback end FB holds, thus by the break-make of the first optocoupler U2, the ground state of the RT end of control LLC control chip U3, and then the Mup changing LLC control chip U3 holds, Mlow holds and the output of HB end, thus realize controlling the break-make of LLC transformer 320 armature winding L1.
Described light-adjusting module 100 comprises the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the second diode D2, the second optocoupler U4 and the first triode Q3: one end of described 6th resistance R6 is connected the output of described circuit of reversed excitation module 80, the other end of described 6th resistance R6 connects the first end 1 ' of the second optocoupler U4, second end 2 ' of described second optocoupler U4 connects the collector electrode of the first triode Q3, the grounded emitter of described first triode Q3; The 3rd end 3 ' ground connection of described second optocoupler U4, the 4th end 4 ' of described second optocoupler U4 connects the BO end of described LLC control chip U3; The input of the just very described light-adjusting module 100 of described second diode D2, connect PWM dim signal providing end BL_PWM, the negative pole of described second diode D2 by the 7th resistance R7 connect the first triode Q3 base stage, also by the 8th resistance R8 ground connection.Described first triode Q3 is NPN type triode.By the pwm signal that PWM dim signal providing end BL_PWM provides, the break-make of the second optocoupler U4 can be controlled, and then the ground state of the BO end of control LLC control chip U3, the output realizing holding the Mup of LLC control chip U3, Mlow holds and HB holds controls, and realizes light modulation.LED television two-in-one electric source circuit provided by the invention, only need increase the operating state that an optocoupler controls front end LLC, structure is simple, and it is convenient to control, and saves components and parts cost.
Described LLC control module 70 also comprises the second electric capacity C2, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11 and the 12 resistance R12; One end of described 9th resistance R9 connects one end of the output of PFC module 20 and the armature winding of LLC transformer, and the other end of described 9th resistance R9 connects one end of the tenth resistance R10, the 4th end 4 ' of the second optocoupler U4 is held with the BO of LLC control chip U3; The other end ground connection of described tenth resistance R10; The RT of described LLC control chip U3 is held by the 11 resistance R11 ground connection, the one end also being connected the second electric capacity C2 by described 12 resistance R12, the other end ground connection of described second electric capacity C2.
Please continue to refer to Fig. 4, LED television two-in-one electric source circuit provided by the invention, comprises two LED lamp bar 40 and the corresponding LED lamp bar 40 of two rectification filtering units, 330, rectification filtering unit 330.Therefore described LLC transformer comprises two secondary winding, a corresponding rectification filtering unit 330 of secondary winding.Described constant flow module 50 all samples (in figure, circuit diagram only illustrates that it is connected with a LED lamp bar 40) to two LED lamp bar 40.
See also Fig. 5, the output V_12 of described circuit of reversed excitation module 80 connects described mainboard movement 90, and certainly, described circuit of reversed excitation module 80 is also powered for described light-adjusting module 100, constant flow module 50 and feedback module 60.
Described circuit of reversed excitation module 80 comprises: switching tube unit 810, flyback transformer 820, second rectification filtering unit 830, feedback unit 840, flyback controller 850.
Described switching tube unit 810, for controlling the break-make of flyback transformer 820.
Described flyback transformer 820, for the voltage of voltage transitions needed for described mainboard movement 90 PFC module 20 exported, is specially the direct current being converted to 12.2V and exports to described mainboard movement 90.
Described second rectification filtering unit 830, carries out rectifying and wave-filtering for the voltage inputted flyback transformer 820, and exports to described mainboard movement 90.
Described feedback unit 840, for gathering the voltage of described mainboard movement 90, and exports to flyback controller 850.
Described flyback controller 850, for the voltage fed back according to feedback unit 840, the voltage stabilizing being realized circuit of reversed excitation module by the break-make of control switch pipe unit 810 is exported.
Described PFC module 20 connects one end of described flyback transformer 820 armature winding, the other end of described flyback transformer 820 armature winding connects the output of described switching tube unit 810, and the secondary winding of described flyback transformer 820 connects described feedback unit 840, also connects described mainboard movement 90 by described second rectification filtering unit 830; Described feedback unit 840 connects the input of described switching tube unit 810 by described flyback controller 850.
In sum, LED television two-in-one electric source circuit provided by the invention, after alternating current input after over commutation filtering PFC, be split up into two independently power modules, one of them is LLC half-bridge resonance module, and LLC resonance exports the voltage close with LED lamp bar voltage, through simple constant flow module (CCCV pattern) or the CCCV constant flow module that carried by amplifier, by changing the parameter of feedback circuit, elementary to LLC through opto-coupled feedback, thus reach the object of constant current.Another one power module is simple circuit of reversed excitation, and the 12V of direct stable output supplies mainboard movement and uses.
LED television two-in-one electric source circuit provided by the invention has merged the advantage of traditional circuit and secondary LLC constant-current circuit, specifically has the following advantages:
1, the mainboard movement that drives of 12V and backlight (LED lamp bar) are split up into two power modules and power, and power supplying efficiency is high, and cost is low;
2, LLC controller is placed on elementary, and Real-Time Monitoring resonant slots state, protects complete;
3, without driving transformer, the number of safety device is few.
Based on the LED television two-in-one electric source circuit that a upper embodiment provides, the present invention also provides a kind of LED television, comprises LED television two-in-one electric source circuit as above.Because the power work principle of described LED television, the technical characteristic of power supply elaborate in a upper embodiment, do not repeat them here.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a LED television two-in-one electric source circuit, is characterized in that, comprises rectification filtering module, PFC module, circuit of reversed excitation module, LLC half-bridge resonance module, constant flow module, feedback module and LLC control module;
Alternating current is carried out rectification and filtering by described rectification filtering module, exports to PFC module; Described PFC module carries out power factor correction to the direct current after rectifying and wave-filtering, and exports to LLC half-bridge resonance module and circuit of reversed excitation module; Described LLC half-bridge resonance module is powered to LED lamp bar; Described constant flow module the sampling electric current of LED lamp bar, the parameter according to this Current adjustment feedback module, make LLC control module feed back to the elementary of the LLC transformer of LLC half-bridge resonance module, make the current constant of LED lamp bar; The voltage of described circuit of reversed excitation module stable output is powered to mainboard movement.
2. LED television two-in-one electric source circuit according to claim 1, is characterized in that, LLC half-bridge resonance module comprises:
LLC metal-oxide-semiconductor unit, for the output signal according to LLC control module, the break-make of control LLC transformer;
LLC transformer, for step-down also for LED lamp bar is powered;
First rectification filtering unit, carries out rectifying and wave-filtering for the voltage inputted LLC transformer, and exports to described LED lamp bar;
Described LLC control module connects described LLC transformer by described LLC metal-oxide-semiconductor unit, and described LLC transformer connects described LED lamp bar by described first rectification filtering unit.
3. LED television two-in-one electric source circuit according to claim 2, is characterized in that, described LLC metal-oxide-semiconductor unit comprises the first metal-oxide-semiconductor and the second metal-oxide-semiconductor; The drain electrode of described first metal-oxide-semiconductor connects one end of the output of PFC module and the armature winding of described LLC transformer, the source electrode of described first metal-oxide-semiconductor connects the other end of the armature winding of described LLC transformer and the drain electrode of the second metal-oxide-semiconductor, and the grid level of described first metal-oxide-semiconductor connects described LLC control module; The grid of described second metal-oxide-semiconductor connects described LLC control module, the source ground of described second metal-oxide-semiconductor.
4. LED television two-in-one electric source circuit according to claim 3, is characterized in that, described constant flow module comprises constant current constant voltage control chip, the first resistance, the second resistance and the 3rd resistance; One end of described first resistance be described constant flow module voltage input end, connect the output of the first rectification filtering unit and the positive pole of LED lamp bar, the other end of described first resistance connects the VSENSE end of constant current constant voltage control chip, also by the second grounding through resistance; One end of described 3rd resistance is the ISENSE end of the current input terminal of described constant flow module, the negative pole connecting LED lamp bar and constant current constant voltage control chip, the other end ground connection of described 3rd resistance; The VCC end of described constant current constant voltage control chip connects the output of described circuit of reversed excitation module, and the FB end of described constant current constant voltage control chip connects the input of described feedback module, and the GND end of described constant current constant voltage control chip and Ictrl hold ground connection.
5. LED television two-in-one electric source circuit according to claim 4, is characterized in that, described feedback module comprises the first optocoupler, the 4th resistance and the 5th resistance; One end of described 4th resistance be described feedback module input, connect the FB end of described constant current constant voltage control chip, the other end of described 4th resistance connects the second end of described first optocoupler, and the first end of described first optocoupler connects the output of described circuit of reversed excitation module; 3rd end ground connection of described first optocoupler, the 4th end of described first optocoupler connects one end of the 5th resistance, and the other end of described 5th resistance is the output of described feedback module, the first input end connecting described LLC control module.
6. LED television two-in-one electric source circuit according to claim 5, it is characterized in that, described power circuit also comprises light-adjusting module, and described light-adjusting module is according to pwm signal, controlled the output of described LLC half-bridge resonance module by described LLC control module, realize the light modulation to LED lamp bar.
7. LED television two-in-one electric source circuit according to claim 6, is characterized in that, described LLC control module comprises LLC control chip, the first diode and the first electric capacity; The VCC end of described LLC control chip connects externally fed end; The positive pole of described first diode connects the VCC end of externally fed end and described LLC control chip, the negative pole of described first diode connects the Vboot end of described LLC control chip and one end of the first electric capacity, and the other end of described first electric capacity connects the Mup end of described LLC control chip and the grid of the first metal-oxide-semiconductor; The HB of described LLC control chip holds the source electrode of connection first metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor and the other end of LLC primary winding; The Mlow end of described LLC control chip connects the grid of described second metal-oxide-semiconductor; The RT end of described LLC control chip is the first input end of LLC control module, the other end of connection the 5th resistance; The second input that the BO end of described LLC control chip is LLC control module, connect described light-adjusting module, the GND of described LLC control chip holds ground connection.
8. LED television two-in-one electric source circuit according to claim 7, it is characterized in that, described light-adjusting module comprises the 6th resistance, the 7th resistance, the 8th resistance, the second diode, the second optocoupler and the first triode: one end of described 6th resistance is connected the output of described circuit of reversed excitation module, the other end of described 6th resistance connects the first end of the second optocoupler, second end of described second optocoupler connects the collector electrode of the first triode, the grounded emitter of described first triode; 3rd end ground connection of described second optocoupler, the 4th end of described second optocoupler connects the BO end of described LLC control chip; The input of the just very described light-adjusting module of described second diode, connect PWM dim signal providing end, the negative pole of described second diode by the 7th resistance connect the first triode base stage, also by the 8th grounding through resistance.
9. LED television two-in-one electric source circuit according to claim 8, is characterized in that, described circuit of reversed excitation module comprises:
Switching tube unit, for controlling the break-make of flyback transformer;
Flyback transformer, for the voltage of voltage transitions needed for described mainboard movement PFC module exported;
Second rectification filtering unit, carries out rectifying and wave-filtering for the voltage inputted flyback transformer, and exports to described mainboard movement;
Feedback unit, for gathering the voltage of described mainboard movement, and exports to flyback controller;
Flyback controller, for the voltage fed back according to feedback unit, the voltage stabilizing being realized circuit of reversed excitation module by the break-make of control switch pipe unit is exported;
Described PFC module connects one end of described flyback transformer armature winding, the other end of described flyback transformer armature winding connects the output of described switching tube unit, and the secondary winding of described flyback transformer connects described feedback unit, also connects described mainboard movement by described second rectification filtering unit; Described feedback unit connects the input of described switching tube unit by described flyback controller.
10. a LED television, is characterized in that, comprises the LED television two-in-one electric source circuit as described in claim 1-9 any one.
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| CN201510332014.8A CN104935843B (en) | 2015-06-16 | 2015-06-16 | A kind of LED television two-in-one electric source circuit and LED television |
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