CN204993097U - Turn over and swash formula alternately load regulation switching power supply and TV - Google Patents
Turn over and swash formula alternately load regulation switching power supply and TV Download PDFInfo
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- CN204993097U CN204993097U CN201520612455.9U CN201520612455U CN204993097U CN 204993097 U CN204993097 U CN 204993097U CN 201520612455 U CN201520612455 U CN 201520612455U CN 204993097 U CN204993097 U CN 204993097U
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- 238000005070 sampling Methods 0.000 claims abstract description 29
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- 238000004804 winding Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 description 8
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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 turn over and swash formula alternately load regulation switching power supply and TV, including EMI filtering rectifier module, turn over and swash topological module, first rectifying and wave -filtering output module, second rectifying and wave -filtering output module, the feedback module and the sampling module that steps down, alternating voltage is after EMI filtering rectifier module carries out EMI filtering and rectification processing, by turn over swashing the processing of stepping up of topological module, carry out the first voltage of rectifying and wave -filtering output through first rectifying and wave -filtering output module, carry out rectifying and wave -filtering output second voltage through second rectifying and wave -filtering output module simultaneously, feedback module gives the sharp topological module of turning over with first voltage and the 2nd voltage feedback, the first rectifying and wave -filtering output module's of step -down sampling module sampling first voltage, when first voltage is greater than presupposition voltage, handle the output voltage who makes first rectifying and wave -filtering output module reduces through stepping down, thereby protect the filter capacitance among the first rectifying and wave -filtering output module not damaged, the low power dissipation of sampling module and step down, the stand -by power consumption that makes the TV is low.
Description
Technical field
The utility model relates to switching power circuit technical field, particularly a kind of inverse-excitation type cross load regulation Switching Power Supply and TV.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintains a kind of power supply of regulated output voltage.Along with development and the innovation of power electronic technology, switch power technology is also constantly being innovated.At present, Switching Power Supply to be widely used nearly all electronic equipment with small-sized, light weight and high efficiency feature, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.
LED television power supply generally uses the flyback topologies switching power circuit of doubleway output, as shown in Figure 1, generally export using+12V as principal voltage, + 130V exports as auxiliary voltage, this requires that the scope of+12V is more accurate, and+130V inputs as the boosting of backlight voltage, BOOST boosting (boost boosting is the boosting of a kind of switch DC) constant current is also had as backlight drive because of general after+130V, therefore the voltage range that this road of right+130V exports requires little, as long as be no more than the withstand voltage of filter capacitor C1.
In order to meet above requirement, common practices is :+12V is as primary feedback, its feedback current is larger, and+130V is as auxiliary feedback, its feedback current is smaller, i.e. I1[(+12V-2.5V)/R1] much larger than I2[(+130V-2.5V)/(R2+R3)], wherein, the resistance that the resistance that the resistance that the conducting voltage that 2.5V is controlled source of stable pressure, R1 are the first resistance, R2 are the second resistance, R3 are the 3rd resistance.
Aforesaid way, if when+12V and+130V all have a fixed load ,+12V can accomplish more stable.But when+130V load is zero, namely TV backlight is not opened, and during+12V heavier loads, the voltage of+130V can rise very high because cross load adjusts problem, has the risk exceeding filter capacitor C1 withstand voltage, there is very large reliability hidden danger.
In order to solve the problem, the way alleviated at present is that this increases dummy load on the way at+130V, as the 4th resistance R4 and the 5th resistance R5, but can increase stand-by power consumption like this, and cost of idleness.For 130V, the 4th resistance R4 and the 5th resistance R5 is the resistance of 100k/2W, the stand-by power consumption consumed
.Known, when this mode TV backlight is not opened, add stand-by power consumption, be unfavorable for energy-conservation.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide inverse-excitation type cross load regulation Switching Power Supply and TV, reaches by increasing feedback quantity the object that reduction output voltage protects the filter capacitor on high voltage step-up branch road.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of inverse-excitation type cross load regulation Switching Power Supply, comprises EMI filter rectification module, flyback topologies module, the first rectifying and wave-filtering output module, the second rectifying and wave-filtering output module and feedback module, alternating voltage carries out after EMI filtering and rectification process through EMI filter rectification module, boosted by flyback topologies module and process, carry out rectifying and wave-filtering through the first rectifying and wave-filtering output module and export the first voltage, carrying out rectifying and wave-filtering through the second rectifying and wave-filtering output module exports the second voltage simultaneously, described flyback topologies module is given by described first voltage and the second Voltage Feedback by described feedback module, described inverse-excitation type cross load regulation Switching Power Supply also comprises for the first voltage of sampling, the step-down sampling module of step-down process is carried out when described first voltage is greater than predeterminated voltage, described step-down sampling module connects the first rectifying and wave-filtering output module and feedback module.
In described inverse-excitation type cross load regulation Switching Power Supply, described step-down sampling module comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, triode and the first controlled source of stable pressure, one end of described first resistance connects one end of the 5th resistance, one end of 7th resistance and the output of the first rectifying and wave-filtering output module, the other end of described first resistance is successively by the second resistance, 3rd resistance connects the reference edge of the first controlled source of stable pressure and one end of the 4th resistance, the other end of described 4th resistance and the plus earth of the first controlled source of stable pressure, the negative electrode of described first controlled source of stable pressure is by the base stage of the 6th resistance connecting triode and the other end of the 5th resistance, the collector electrode of triode connects feedback module, the emitter of triode connects the other end of the 7th resistance.
In described inverse-excitation type cross load regulation Switching Power Supply, described step-down sampling module also comprises the first electric capacity, and one end of described first electric capacity connects the reference edge of controlled source of stable pressure, the other end ground connection of the first electric capacity.
In described inverse-excitation type cross load regulation Switching Power Supply, described flyback topologies module comprises flyback transformer, first rectifying and wave-filtering output module comprises diode and the second electric capacity, the positive pole of described diode connects the Same Name of Ends of the first secondary winding of flyback transformer, described diode cathode is the output of the first rectifying and wave-filtering output module, the one end connecting feedback module and the 7th resistance, one end of the 5th resistance and one end of the first resistance, also by the second capacity earth; The different name end of the first secondary winding of described flyback transformer connects the Same Name of Ends of the second subprime winding of flyback transformer.
In described inverse-excitation type cross load regulation Switching Power Supply, described feedback module comprises the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd electric capacity, optocoupler and the second controlled source of stable pressure, one end of described 9th resistance connects the output of one end of the 5th resistance, one end of the 7th resistance and the first rectifying and wave-filtering output module, and the other end of described 9th resistance is by the collector electrode of the tenth resistance connecting triode; One end of described 8th resistance is connected the output of the second rectifying and wave-filtering output module, is also connected the 1st end of optocoupler by the 11 resistance, the other end of described 8th resistance connect the second controlled source of stable pressure reference pole, also successively by the 3rd electric capacity to be connected with the 12 resistance the negative electrode of the second controlled source of stable pressure and optocoupler the 2nd end, also by the 13 grounding through resistance, the plus earth of described second controlled source of stable pressure, 4th end of described optocoupler connects flyback topologies module, the 3rd end ground connection of optocoupler.
In described inverse-excitation type cross load regulation Switching Power Supply, described first voltage is more than 130V, and the second voltage is 12V.
In described inverse-excitation type cross load regulation Switching Power Supply, the resistance of described first resistance is 1 megohm, the resistance of the second resistance is 1 megohm, the resistance of the 3rd resistance is 1 megohm, the resistance of the 4th resistance is 43 kilohms.
A kind of TV, comprises inverse-excitation type cross load regulation Switching Power Supply as above.
Compared to prior art, the inverse-excitation type cross load regulation Switching Power Supply that the utility model provides and TV, comprise EMI filter rectification module, flyback topologies module, first rectifying and wave-filtering output module, second rectifying and wave-filtering output module, feedback module and step-down sampling module, described alternating voltage carries out after EMI filtering and rectification process through EMI filter rectification module, boosted by flyback topologies module and process, carry out rectifying and wave-filtering through the first rectifying and wave-filtering output module and export the first voltage, carrying out rectifying and wave-filtering through the second rectifying and wave-filtering output module exports the second voltage simultaneously, described first voltage and the second Voltage Feedback are given described flyback topologies module by described feedback module, described step-down sampling module is sampled the first voltage of the first rectifying and wave-filtering output module, when the first voltage is greater than predeterminated voltage, carrying out step-down process by increase feedback quantity makes the output voltage of the first rectifying and wave-filtering output module reduce, thus protect the filter capacitor in the first rectifying and wave-filtering output module not damaged, and step-down sampling module is low in energy consumption, make the stand-by power consumption of TV low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the flyback topologies Switching Power Supply of the doubleway output of prior art.
The circuit diagram of the inverse-excitation type cross load regulation Switching Power Supply that Fig. 2 provides for the utility model.
Embodiment
The utility model provides inverse-excitation type cross load regulation Switching Power Supply and TV, for making the purpose of this utility model, technical scheme and effect clearly, clearly, further describes the utility model referring to the accompanying drawing embodiment that develops simultaneously.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.
Refer to Fig. 2, the inverse-excitation type cross load regulation Switching Power Supply that the utility model provides comprises EMI filter rectification module 10, flyback topologies module 20, first rectifying and wave-filtering output module 30, second rectifying and wave-filtering output module 40, feedback module 50 and step-down sampling module 60.Described EMI filter rectification module 10 connects flyback topologies module 20, flyback topologies module 20 connects the input of the first rectifying and wave-filtering output module 30 and the input of the second rectifying and wave-filtering output module 40, the output of described first rectifying and wave-filtering output module 30 is connected feedback module 50 with the output of the second rectifying and wave-filtering output module 40, and described step-down sampling module 60 connects the first rectifying and wave-filtering output module 30 and feedback module 50.
Described first rectifying and wave-filtering output module 30 is auxiliary output branch road, and its output voltage is more than+130V, and namely the first voltage is more than+130V.Second rectifying and wave-filtering output module 40 is main output branch road, and its output voltage is+12V, and namely the first voltage is+12V.Alternating voltage carries out after EMI filtering and rectification process through EMI filter rectification module 10, to be boosted process by flyback topologies module 20, carry out rectifying and wave-filtering through the first rectifying and wave-filtering output module 30 and export the first voltage, carrying out rectifying and wave-filtering through the second rectifying and wave-filtering output module 40 exports the second voltage simultaneously, described first voltage and the second Voltage Feedback are given described flyback topologies module 20 by described feedback module 50, described step-down sampling module 60 is for the first voltage of sampling, increase feedback quantity when described first voltage is greater than predeterminated voltage and carry out step-down process, the output voltage of the first rectifying and wave-filtering output module 30 is reduced, thus the electronic device (as filter capacitor) in protection the first rectifying and wave-filtering output module 30, and step-down sampling module 60 is low in energy consumption.
Please continue to refer to Fig. 2, described step-down sampling module 60 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, triode Q1 and the first controlled source of stable pressure N1.One end of described first resistance R1 connects one end of the 5th resistance R5, one end of 7th resistance R7 and the output of the first rectifying and wave-filtering output module 30, the other end of described first resistance R1 is successively by the second resistance R2, 3rd resistance R3 connects the reference edge of the first controlled source of stable pressure N1 and one end of the 4th resistance R4, the other end of described 4th resistance R4 and the plus earth of the first controlled source of stable pressure N1, the negative electrode of described first controlled source of stable pressure N1 is by the base stage of the 6th resistance R6 connecting triode Q1 and the other end of the 5th resistance R5, the collector electrode of triode Q1 connects feedback module 50, the emitter of triode Q1 connects the other end of the 7th resistance R7.
Described first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 are sampling resistor, and the resistance of described first resistance R1 is 1 megohm, the resistance of the second resistance R2 is 1 megohm, the resistance of the 3rd resistance R3 is 1 megohm, the resistance of the 4th resistance R4 is 43 kilohms.Described first controlled source of stable pressure N1 is for detecting sampled voltage; when the output voltage of the first rectifying and wave-filtering output module 30 is greater than predeterminated voltage (as 200V); first controlled source of stable pressure N1 conducting; the base stage of this triode Q1 becomes low level and conducting; make the 7th resistance R7 in parallel with the auxiliary feedback fraction of feedback module 50; thus add feedback quantity, make the output voltage step-down of the first rectifying and wave-filtering output module 30, thus protect the electronic device of the first rectifying and wave-filtering output module 30.
Further, described step-down sampling module 60 also comprises the first electric capacity C1, and one end of described first electric capacity C1 connects the reference edge of controlled source of stable pressure, the other end ground connection of the first electric capacity C1, this first electric capacity C1 is filter capacitor, stablizes for making the reference pole tension of the first controlled source of stable pressure N1.
Please continue to refer to Fig. 2, described flyback topologies module 20 comprises flyback transformer T1, first rectifying and wave-filtering output module 30 comprises diode D1 and the second electric capacity C2, the positive pole of described diode D1 connects the Same Name of Ends of first secondary winding of flyback transformer T1, described diode D1 negative pole be the first rectifying and wave-filtering output module 30 output, connect one end of feedback module 50 and one end of the 7th resistance R7, one end of the 5th resistance R5 and the first resistance R1, also by the second electric capacity C2 ground connection; The different name end of first secondary winding of described flyback transformer T1 connects the Same Name of Ends of the second subprime winding of flyback transformer T1.
Wherein, the primary sections of flyback transformer T1 is flyback portion, and secondary winding portion is self-excitation part.Described diode D1 is rectifier diode, and described second electric capacity C2 is filter capacitor, and described step-down sampling module 60 is mainly used in the output voltage by reducing the first rectifying and wave-filtering output module 30, prevents the second electric capacity C2 from damaging.
Please continue to refer to Fig. 2, described feedback module 50 comprises the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, the 3rd electric capacity C3, optocoupler U1 and the second controlled source of stable pressure N2.One end of described 9th resistance R9 connects the output of one end of the 5th resistance R5, one end of the 7th resistance R7 and the first rectifying and wave-filtering output module 30, and the other end of described 9th resistance R9 is by the collector electrode of the tenth resistance R10 connecting triode Q1; One end of described 8th resistance R8 is connected the output of the second rectifying and wave-filtering output module 40, is also connected the 1st end of optocoupler U1 by the 11 resistance R11, the other end of described 8th resistance R8 connect the second controlled source of stable pressure N2 reference pole, also successively by the 3rd electric capacity C3 to be connected with the 12 resistance R12 the negative electrode of the second controlled source of stable pressure N2 and optocoupler U1 the 2nd end, also by the 13 resistance R13 ground connection, the plus earth of described second controlled source of stable pressure N2,4th end of described optocoupler U1 connects the 3rd end ground connection of flyback topologies module 20, optocoupler U1.
Wherein, described 8th resistance R8 is primary feedback resistance, for the output voltage of main output branch road is fed back to flyback topologies module 20,9th resistance R9 and the tenth resistance R10 is auxiliary feedback resistance, for the output voltage of auxiliary output branch road is fed back to flyback topologies module 20, the model of described optocoupler U1 is PC817B, mainly plays buffer action.
The operation principle of composition graphs 2 to inverse-excitation type cross load regulation Switching Power Supply of the present utility model please be descend to be described in detail:
In Fig. 2, the heavy line through flyback transformer T1 and optocoupler U1 is flyback, self-excitation separator bar, and the left side of heavy line is flyback portion, and the right side of heavy line is self-excitation part.When the voltage rising of auxiliary output branch road exceeds 200V; first controlled source of stable pressure N1 conducting; make triode Q1 conducting; thus make the 7th resistance R7 in parallel with the 9th resistance R9 and the tenth resistance R10; thus increase feedback quantity, the output voltage of auxiliary output branch road is reduced, thus protects the first electric capacity C1; after adopting the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the stand-by power consumption of described consumption is:
, it is compared with the scheme of existing increase dummy load, and stand-by power consumption decreases 300.
The utility model is also corresponding provides a kind of TV, it comprises above-mentioned inverse-excitation type cross load regulation Switching Power Supply, because the circuit structure of this inverse-excitation type cross load regulation Switching Power Supply and operation principle have carried out corresponding description above, repeated no more herein.
In sum, the inverse-excitation type cross load regulation Switching Power Supply that the utility model provides and TV, comprise EMI filter rectification module, flyback topologies module, first rectifying and wave-filtering output module, second rectifying and wave-filtering output module, feedback module and step-down sampling module, described alternating voltage carries out after EMI filtering and rectification process through EMI filter rectification module, boosted by flyback topologies module and process, carry out rectifying and wave-filtering through the first rectifying and wave-filtering output module and export the first voltage, carrying out rectifying and wave-filtering through the second rectifying and wave-filtering output module exports the second voltage simultaneously, described first voltage and the second Voltage Feedback are given described flyback topologies module by described feedback module, described step-down sampling module is sampled the first voltage of the first rectifying and wave-filtering output module, when the first voltage is greater than predeterminated voltage, carrying out step-down process by increase feedback quantity makes the output voltage of the first rectifying and wave-filtering output module reduce, thus protect the filter capacitor in the first rectifying and wave-filtering output module not damaged, and step-down sampling module is low in energy consumption, make the stand-by power consumption of TV low.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (8)
1. an inverse-excitation type cross load regulation Switching Power Supply, comprises EMI filter rectification module, flyback topologies module, the first rectifying and wave-filtering output module, the second rectifying and wave-filtering output module and feedback module, alternating voltage carries out after EMI filtering and rectification process through EMI filter rectification module, boosted by flyback topologies module and process, carry out rectifying and wave-filtering through the first rectifying and wave-filtering output module and export the first voltage, carrying out rectifying and wave-filtering through the second rectifying and wave-filtering output module exports the second voltage simultaneously, described flyback topologies module is given by described first voltage and the second Voltage Feedback by described feedback module, it is characterized in that, described inverse-excitation type cross load regulation Switching Power Supply also comprises for the first voltage of sampling, the step-down sampling module of step-down process is carried out when described first voltage is greater than predeterminated voltage, described step-down sampling module connects the first rectifying and wave-filtering output module and feedback module.
2. inverse-excitation type cross load regulation Switching Power Supply according to claim 1, it is characterized in that, described step-down sampling module comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, triode and the first controlled source of stable pressure, one end of described first resistance connects one end of the 5th resistance, one end of 7th resistance and the output of the first rectifying and wave-filtering output module, the other end of described first resistance is successively by the second resistance, 3rd resistance connects the reference edge of the first controlled source of stable pressure and one end of the 4th resistance, the other end of described 4th resistance and the plus earth of the first controlled source of stable pressure, the negative electrode of described first controlled source of stable pressure is by the base stage of the 6th resistance connecting triode and the other end of the 5th resistance, the collector electrode of triode connects feedback module, the emitter of triode connects the other end of the 7th resistance.
3. inverse-excitation type cross load regulation Switching Power Supply according to claim 2, it is characterized in that, described step-down sampling module also comprises the first electric capacity, and one end of described first electric capacity connects the reference edge of controlled source of stable pressure, the other end ground connection of the first electric capacity.
4. inverse-excitation type cross load regulation Switching Power Supply according to claim 2, it is characterized in that, described flyback topologies module comprises flyback transformer, first rectifying and wave-filtering output module comprises diode and the second electric capacity, the positive pole of described diode connects the Same Name of Ends of the first secondary winding of flyback transformer, described diode cathode is the output of the first rectifying and wave-filtering output module, the one end connecting feedback module and the 7th resistance, one end of the 5th resistance and one end of the first resistance, also by the second capacity earth; The different name end of the first secondary winding of described flyback transformer connects the Same Name of Ends of the second subprime winding of flyback transformer.
5. inverse-excitation type cross load regulation Switching Power Supply according to claim 2, it is characterized in that, described feedback module comprises the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd electric capacity, optocoupler and the second controlled source of stable pressure, one end of described 9th resistance connects the output of one end of the 5th resistance, one end of the 7th resistance and the first rectifying and wave-filtering output module, and the other end of described 9th resistance is by the collector electrode of the tenth resistance connecting triode; One end of described 8th resistance is connected the output of the second rectifying and wave-filtering output module, is also connected the 1st end of optocoupler by the 11 resistance, the other end of described 8th resistance connect the second controlled source of stable pressure reference pole, also successively by the 3rd electric capacity to be connected with the 12 resistance the negative electrode of the second controlled source of stable pressure and optocoupler the 2nd end, also by the 13 grounding through resistance, the plus earth of described second controlled source of stable pressure, 4th end of described optocoupler connects flyback topologies module, the 3rd end ground connection of optocoupler.
6. inverse-excitation type cross load regulation Switching Power Supply according to claim 1, it is characterized in that, described first voltage is more than 130V, and the second voltage is 12V.
7. inverse-excitation type cross load regulation Switching Power Supply according to claim 2, it is characterized in that, the resistance of described first resistance is 1 megohm, the resistance of the second resistance is 1 megohm, the resistance of the 3rd resistance is 1 megohm, the resistance of the 4th resistance is 43 kilohms.
8. a TV, is characterized in that, comprises the inverse-excitation type cross load regulation Switching Power Supply as described in claim 1-7 any one.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703611A (en) * | 2016-03-11 | 2016-06-22 | 深圳市华星光电技术有限公司 | Voltage feedback circuit of flyback switching power supply and flyback switching power supply |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703611A (en) * | 2016-03-11 | 2016-06-22 | 深圳市华星光电技术有限公司 | Voltage feedback circuit of flyback switching power supply and flyback switching power supply |
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