CN103051195B - Power supply circuits and LCD TV - Google Patents
Power supply circuits and LCD TV Download PDFInfo
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- CN103051195B CN103051195B CN201310006621.6A CN201310006621A CN103051195B CN 103051195 B CN103051195 B CN 103051195B CN 201310006621 A CN201310006621 A CN 201310006621A CN 103051195 B CN103051195 B CN 103051195B
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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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
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Abstract
The invention provides a kind of power supply circuits, comprise: resonant control circuit, isolated drive circuit, the first output circuit and the second output circuit, wherein, resonant control circuit receives from the first direct current of outside and the drive singal from isolated drive circuit, exports the second direct current according to drive singal and the first direct current respectively to the first output circuit and the second output circuit; Isolated drive circuit is connected to resonant control circuit, for resonant control circuit output drive signal.Present invention also offers a kind of LCD TV.According to technical scheme of the present invention, utilize secondary circuit to control primary resonant circuit, realize the driving of big power LED backlight source, and control to incorporate main board power supply by double loop feedback.
Description
Technical field
The present invention relates to Display Technique field, in particular to power supply circuits and the LCD TV with these power supply circuits.
Background technology
LED as the backlight of LCD TV, in large-sized LCD TV has the even more lamp bars of two-way at least.Power drives mode is that a road booster circuit drives a paths of LEDs lamp bar, realizes each street lamp bar electric current equal by the electric current sampling every street lamp bar, to meet television image display requirement.Multi-path lamp strip is generally low pressure 24V input, and adopt this kind of mode generally to need comparatively multi-chip and peripheral component, cost is higher.Therefore, increase the quantity of every street lamp bar LED, reducing lamp bar quantity, is the trend of current LED liquid crystal television backlight.
Current, 42 cun, 46 cun LED liquid crystal television have two-way or more Multi-path lamp strip, and the construction for electricity of employing and type of drive are as shown in FIG. 1A and 1B.
Figure 1A is Power supply part, and by PFC power supply 106, half-bridge resonance control chip 102, LLC resonance controls and energy transfer circuit 104 is formed, and the voltage being produced 12V and 100V by switch transformer T1 is exported, in order to give secondary power.This Power supply part needs half-bridge resonance control chip 102 and peripheral circuit thereof, and device is more.
Figure 1B is driving circuit section, controls with driving chip 110, only show the two-way that driving chip 110 controls in Figure 1B, four street lamp bars or the Multi-path lamp strip identical lamp number of same drive control circuit.Every street lamp bar all uses Boost circuit 108 to carry out the topological mode of boosting, this Boost circuit 108 needs boost metal-oxide-semiconductor (V3 or V5) and a light modulation metal-oxide-semiconductor (V4 or V6), and the output of every road all needs electrochemical capacitor (C5 or C6) normally to work to meet LED.Therefore, this driving circuit section needs special driving chip to coordinate Boost topology peripheral circuit, and device is more.
Therefore, need a kind of power supply circuits of simplification, reduce the setting of components and parts, and then reduce production cost.
Summary of the invention
Consider above-mentioned background technology, goal of the invention of the present invention is to provide a kind of power supply circuits, can simplify circuit framework, reduces production cost.
In view of this, according to an aspect of the present invention, provide a kind of power supply circuits, comprise: resonant control circuit, isolated drive circuit, the first output circuit and the second output circuit, wherein, described resonant control circuit receives from the first direct current of outside and the drive singal from described isolated drive circuit, exports the second direct current according to described drive singal and described first direct current respectively to described first output circuit and described second output circuit; Described isolated drive circuit is connected to described resonant control circuit, for exporting described drive singal to described resonant control circuit.
Owing to utilizing the elementary LLC resonant control circuit of secondary circuit drived control, then the first output circuit is passed through directly to the first load supplying, and pass through the drive circuit of double loop design integration the second load (being driven by the second output circuit), add marginal BOOST driving chip by original former limit LLC driving chip and replace with the load of an isolated drive circuit control LLC Direct driver first, simplify original Circuits System, reduce production cost.
According to a further aspect in the invention, provide a kind of LCD TV, comprise the power supply circuits as described in technique scheme.This LCD TV has the technique effect identical with above-mentioned power supply circuits, can integrate main board power supply and backlight driver.
Accompanying drawing explanation
Figure 1A shows the schematic diagram of the power supply circuits part of power supply circuits in correlation technique;
Figure 1B shows the schematic diagram of the driving circuit section of power supply circuits in correlation technique;
Fig. 2 shows the block diagram of power supply circuits according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of power supply circuits according to an embodiment of the invention;
Fig. 4 shows the schematic diagram of commutation circuit according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of commutation circuit according to an embodiment of the invention;
Fig. 6 shows the work wave schematic diagram of two control loops of LED backlight under no-load condition according to an embodiment of the invention;
Fig. 7 shows the work wave schematic diagram of LED backlight two control loops under operating conditions according to an embodiment of the invention;
Fig. 8 to Figure 10 shows the oscillogram of each parameter under non-dimmable state according to an embodiment of the invention;
Figure 11 to Figure 13 shows the oscillogram of each parameter under dimming state according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 2 shows the block diagram of power supply circuits according to an embodiment of the invention.
As shown in Figure 2, power supply circuits 200 comprise according to an embodiment of the invention: resonant control circuit 204, isolated drive circuit 206, first output circuit 208 and the second output circuit 210, wherein, resonant control circuit 204 receives from outside first direct current of (current rectifying and wave filtering circuit in such as Fig. 2) and the drive singal from isolated drive circuit 206, exports the second direct current according to drive singal and described first direct current respectively to the first output circuit 208 and the second output circuit 210; Isolated drive circuit 206 is connected to resonant control circuit 204, for exporting described drive singal to resonant control circuit 204.
Owing to utilizing the elementary LLC resonant control circuit of secondary circuit drived control, then the first output circuit is passed through directly to the first load supplying, and pass through the double loop design integration power supply circuits of the second load, add marginal BOOST driving chip by original former limit LLC driving chip and replace with the load of an isolated drive circuit control LLC Direct driver first, simplify original Circuits System, reduce production cost.
Then with reference to figure 3, Fig. 3 shows the schematic diagram of detailed power supply circuits, as we know from the figure, resonant control circuit 204 roughly can comprise the first field-effect transistor Q1, second field-effect transistor Q2, first transformer T2, resonant capacitance Cr, first rectification unit 2042 and the second rectification unit 2044, wherein, the grid of the first field-effect transistor Q1 and the second field-effect transistor Q2 is all connected to the output of isolated drive circuit 206, the drain electrode of the first field-effect transistor Q1 is connected to outside output, in the present embodiment, the direct current that this outside exports is the direct current through power factor correction that current rectifying and wave filtering circuit exports.
The drain electrode of the second field-effect transistor Q2 is connected to the source electrode of the first field-effect transistor Q1, the source ground of the second field-effect transistor Q2; One end of the former limit winding of the first transformer T2 is connected to the node between the source electrode of the first field-effect transistor Q1 and the drain electrode of the second field-effect transistor Q2, the vice-side winding of the first transformer T2 comprises the first coil and the second coil, first coil is connected to the first output circuit 208, second coil by the first rectification unit 2042 and is connected to the second output circuit 210 by the second rectification unit 2044; One end of resonant capacitance Cr and the source electrode common ground of the second field-effect transistor Q2, the other end of resonant capacitance Cr is connected to the other end of the former limit winding of the first transformer T2, by controlling the alternate conduction of the first field-effect transistor Q1 and the second field-effect transistor Q2, make the magnetizing inductance of resonant capacitance Cr and the first transformer T2, resonant inductance produces resonance, energy is delivered to by transformer secondary.
The electric current that secondary limit induces enters the first output circuit 208 by the first rectification unit 2042; and enter the second output circuit 210 by the second rectification unit 2044; like this; induced energy can be made full use of; be discharged in load; and what obtain is all malleation, is convenient to the detection of electric current and the protection of circuit.
Isolated drive circuit 206 roughly comprises the second transformer T1 and controller IC 1, wherein, the former limit winding switching of the second transformer T1 is to controller IC 1, the vice-side winding of the second transformer T1 comprises tertiary coil and the 4th coil, one end of tertiary coil and one end of the 4th coil are connected to the grid of the first field-effect transistor Q1 and the second field-effect transistor Q2 respectively, and the other end of tertiary coil and the other end of the 4th coil are connected to the source electrode of the first field-effect transistor Q1 and the second field-effect transistor Q2 respectively; Controller IC 1 is to the former limit winding output drive signal of the second transformer T1, and the second transformer T1 adjusts the driving signal frequency of the first field-effect transistor Q1 and the second field-effect transistor Q2 according to drive singal.
As can be seen here, the present invention utilizes secondary circuit to control primary resonant circuit directly to the second load supplying, add marginal BOOST driving chip by original former limit LLC driving chip and replace with controller by the load of transformer coupled control LLC Direct driver second, drive circuit is carried out simplified design, decreases production cost; Meanwhile, owing to only having one-level LLC circuit (resonant control circuit 204), the conversion efficiency of whole circuit is greatly improved.
As seen from Figure 3, resonant control circuit 204 also comprises balancing capacitance Cb, be connected between second coil of the first transformer T2 and the second rectification unit 2044, when the second output circuit 210 exports at least two-way second direct current to the second load, make the equal and opposite in direction of this at least two-way second direct current.
In the schematic diagram shown in Fig. 3, the second output circuit 210 outputs two-way second direct current, and at this, those skilled in the art should be understood that and can also export more multichannel second direct current or road second direct current.
Again as shown in Figure 2, in order to further stable power-supplying voltage, these power supply circuits can also comprise: the first detecting unit 214 and the second detecting unit 212, first detecting unit 214 is connected to the first output circuit 208, detect the first output circuit 208 the first voltage and by the first voltage transmission to controller IC 1, second detecting unit 212 is connected to the negative terminal of the load of the second output circuit 210, detects the second voltage of negative terminal also by described second voltage transmission extremely described controller IC 1; Described controller IC 1 exports the drive singal of the second transformer T1 to according to described first voltage and described second voltage-regulation.In the embodiment shown in fig. 3, the first detecting unit 214 comprises resistance RVL, and the second detecting unit 212 comprises resistance Rsense.
As shown in Figure 4, owing to incorporating two kinds of load supplyings, therefore there is double control loop (LED current control loop and voltage control loop), in order to coordinate this double control loop, the commutation circuit in controller IC 1 is utilized to carry out the work of cooperation control double control loop, its leading role of voltage signal of the second output circuit 210 that namely IFB signal gathers, finally determines the frequency that controls and output drive signal on this basis according to two loops, realizes the normal operation of two loads.
Commutation circuit receives the first voltage that the first detecting unit 214 detects and the second voltage that the second detecting unit 212 detects, when the second voltage is less than threshold voltage, commutation circuit compares the first voltage and reference voltage output drive signal; When the second voltage is more than or equal to threshold voltage, compare the size of the first voltage and the second voltage, according to comparative result output drive signal.
Concrete, as shown in Figure 5, commutation circuit 500 in controller IC 1 comprises the 3rd field-effect transistor 502 and comparator 504, wherein, the grid of the 3rd field-effect transistor 502 receives the second voltage, the drain electrode of the 3rd field-effect transistor 502 is connected to the voltage sampling inverting input of comparator 504, and the source electrode of the 3rd field-effect transistor 502 is connected to the voltage sampling in-phase input end of comparator 504; The voltage sampling in-phase input end of comparator 504 is connected to the 3rd field-effect transistor 502 and reference signal source, and the voltage sampling inverting input of comparator 504 receives described first voltage, and the output of comparator 504 is connected to the second transformer T1.
According to LCD TV of the present invention, comprise the power supply circuits in any embodiment described above.The first output circuit 208 in power supply circuits can be connected to the mainboard of LCD TV, is main board power supply, and the second output circuit 210 in power supply circuits can be connected to the LED backlight of LCD TV, for LED backlight is powered.This LCD TV has the technique effect identical with above-mentioned power supply circuits, can integrate main board power supply and backlight driver.
Below with reference to Fig. 6 to Figure 13, double loop control effects of the present invention is described.In figure 6, LED backlight occurs unloaded, and namely do not work, in the figure 7, LED backlight is normally shinny.4 is the work wave of LED backlight, and 2 is the ideal operation waveform (desirable supply power voltage is 12V) of mainboard, and 3 is the real work waveform of mainboard.Comparison diagram 6 and Fig. 7, can find when LED backlight is unloaded, the electrifying condition of adjustable mainboard.In Fig. 8 to Figure 10,6 is the current waveform of LED backlight, and 5 is the voltage waveform of mainboard, and comparison diagram 8, Fig. 9 and Figure 10 can find, LED backlight is under non-dimmable state, and the voltage of mainboard is substantially constant.In Figure 11 to Figure 13,7 is the current waveform of LED backlight, 8 is the voltage waveform of mainboard, Figure 11 to Figure 13 respectively illustrates and regulates the current waveform of LED backlight (duty ratio is adjusted to 10% from 90%) successively, but not there is significant change in the voltage waveform of mainboard, therefore LED backlight is under dimming state, and the voltage of mainboard is substantially constant.To sum up, the constant voltage that can realize mainboard according to power supply circuits of the present invention is powered and the constant current-supplying of LED backlight.
Should be understood that above-mentioned power supply circuits also can be applicable to other electronic equipments, such as refrigerator, air-conditioning and computing equipment.
More than be described with reference to the accompanying drawings according to technical scheme of the present invention, secondary circuit is utilized to control the driving of elementary LLC circuit realiration big power LED backlight source, and control to incorporate main board power supply by double loop feedback, achieve main board power supply and backlight drive simultaneously.
Then power directly to lamp bar owing to utilizing the elementary LLC resonant circuit of secondary circuit drived control, and pass through double loop design integration main board power supply, original former limit LLC driving chip is added marginal BOOST driving chip and replace with a controller chip by transformer coupled control LLC Direct driver LED lamp bar, and pass through double loop design integration main board power supply, because this simplify original Circuits System, thus reduce cost.Meanwhile, owing to only having one-level LLC circuit, greatly improve the conversion efficiency of whole circuit, reduce electromagnetic interference (EMI, ElectroMagnetic Interference).
In the present invention, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.Term " multiple " refers to two or more, unless otherwise clear and definite restriction.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. power supply circuits, is characterized in that, comprising: resonant control circuit, isolated drive circuit, the first output circuit and the second output circuit, wherein,
Described resonant control circuit receives from the first direct current of outside and the drive singal from described isolated drive circuit, exports the second direct current according to described drive singal and described first direct current respectively to described first output circuit and described second output circuit;
Described isolated drive circuit is connected to described resonant control circuit, for exporting described drive singal to described resonant control circuit;
Described resonant control circuit comprises the first field-effect transistor, the second field-effect transistor, the first transformer, resonant capacitance, the first rectification unit and the second rectification unit, wherein,
The grid of described first field-effect transistor and described second field-effect transistor is all connected to the output of described isolated drive circuit, the drain electrode of described first field-effect transistor is connected to the output of described outside, the drain electrode of described second field-effect transistor is connected to the source electrode of described first field-effect transistor, the source ground of described second field-effect transistor;
One end of the former limit winding of described first transformer is connected to the node between the source electrode of described first field-effect transistor and the drain electrode of described second field-effect transistor, the vice-side winding of described first transformer comprises the first coil and the second coil, described first coil is connected to described first output circuit by the first rectification unit, and described second coil is connected to described second output circuit by the second rectification unit;
One end of described resonant capacitance and the source electrode common ground of described second field-effect transistor, the other end of described resonant capacitance is connected to the other end of the former limit winding of described first transformer, by controlling the alternate conduction of described first field-effect transistor and described second field-effect transistor, making the magnetizing inductance of described resonant capacitance and described first transformer, resonant inductance produces resonance;
Described isolated drive circuit comprises the second transformer and controller, wherein,
The former limit winding switching of described second transformer is to described controller, the vice-side winding of described second transformer comprises tertiary coil and the 4th coil, one end of described tertiary coil and one end of described 4th coil are connected to the grid of described first field-effect transistor and described second field-effect transistor respectively, and the other end of described tertiary coil and the other end of described 4th coil are connected to the source electrode of described first field-effect transistor and described second field-effect transistor respectively;
Described controller exports described drive singal to the former limit winding of described second transformer, and described second transformer adjusts the frequency of the driving instruction of described first field-effect transistor and described second field-effect transistor according to described drive singal;
Described power supply circuits, also comprise: the first detecting unit and the second detecting unit, described first detecting unit is connected to described first output circuit, detect the first voltage of described first output circuit also by described first voltage transmission extremely described controller, described second detecting unit is connected to the negative terminal of the load of described second output circuit, detects the second voltage of described negative terminal also by described second voltage transmission extremely described controller;
Described controller exports the drive singal of described second transformer to according to described first voltage and described second voltage-regulation;
Described controller comprises commutation circuit, receive described first voltage and described second voltage, when described second voltage is less than threshold voltage, more described first voltage of described commutation circuit and reference voltage export described drive singal, when described second voltage is more than or equal to described threshold voltage, export described drive singal according to described first voltage and described second voltage.
2. power supply circuits according to claim 1, is characterized in that, described first detecting unit and the second detecting unit include resistance.
3. power supply circuits according to claim 1, it is characterized in that, described commutation circuit comprises the 3rd field-effect transistor and comparator, wherein, the grid of described 3rd field-effect transistor receives described second voltage, the drain electrode of described 3rd field-effect transistor is connected to the voltage sampling inverting input of described comparator, and the source electrode of described 3rd field-effect transistor is connected to the voltage sampling in-phase input end of described comparator;
The voltage sampling in-phase input end of described comparator is connected to described 3rd field-effect transistor and reference signal source, and the voltage sampling inverting input of described comparator receives described first voltage, and the output of described comparator is connected to described second transformer.
4. power supply circuits according to any one of claim 1 to 3, it is characterized in that, described resonant control circuit also comprises balancing capacitance, be connected between the second coil of described first transformer and described second rectification unit, when described second output circuit exports that at least two-way second direct current is to load, the equal and opposite in direction of at least two-way second direct current described in making.
5. a LCD TV, is characterized in that, comprises the power supply circuits according to any one of Claims 1-4.
6. LCD TV according to claim 5, it is characterized in that, the first output circuit in described power supply circuits is connected to the mainboard of described LCD TV, for described main board power supply, the second output circuit in described power supply circuits is connected to the LED backlight of described LCD TV, for described LED backlight is powered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310006621.6A CN103051195B (en) | 2012-11-19 | 2013-01-09 | Power supply circuits and LCD TV |
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| CN201210479993 | 2012-11-19 | ||
| CN201210479993.6 | 2012-11-19 | ||
| CN2012104799936 | 2012-11-19 | ||
| CN201310006621.6A CN103051195B (en) | 2012-11-19 | 2013-01-09 | Power supply circuits and LCD TV |
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| CN103051195B true CN103051195B (en) | 2015-08-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490634B (en) * | 2013-09-22 | 2016-02-10 | 青岛海信电器股份有限公司 | Power supply circuits and LCD TV |
| CN103560673B (en) * | 2013-11-15 | 2017-03-22 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| AU2014347815A1 (en) * | 2014-08-19 | 2016-03-10 | Abbeydorney Holdings Ltd. | Driving circuit, lighting device and method of reducing power dissipation |
| CN107086026B (en) * | 2017-04-28 | 2019-11-08 | 康佳集团股份有限公司 | A kind of constant-current circuit and television set driving LED backlight |
| CN109935214B (en) * | 2019-04-24 | 2023-10-20 | 合肥惠科金扬科技有限公司 | Backlight driving circuit and backlight driving device |
| WO2022056781A1 (en) * | 2020-09-17 | 2022-03-24 | 广州视源电子科技股份有限公司 | Dimming apparatus and electronic device |
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| CN201984790U (en) * | 2011-04-20 | 2011-09-21 | 青岛海信电器股份有限公司 | Drive circuit and LCD TV |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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