CN203482459U - Improved LED driving power supply with self-regulation PFC voltage - Google Patents
Improved LED driving power supply with self-regulation PFC voltage Download PDFInfo
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- CN203482459U CN203482459U CN201320557337.3U CN201320557337U CN203482459U CN 203482459 U CN203482459 U CN 203482459U CN 201320557337 U CN201320557337 U CN 201320557337U CN 203482459 U CN203482459 U CN 203482459U
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- circuit
- pfc
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- llc
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model relates to an improved LED driving power supply with self-regulation PFC voltage. The improved LED driving power supply comprises an input circuit, a PFC circuit and an LLC circuit which are connected in sequence, wherein the PFC circuit is connected to a PFC control circuit, the PFC control circuit is connected to a PFC bus sampling circuit, the PFC bus sampling circuit is connected with the LLC circuit, and an input sampling circuit is connected with the PFC control circuit and the input circuit. The improved LED driving power supply provided by the utility model has the advantages that the LLC circuit always operates near the resonant frequency, the efficiency of a half load and other load circumstances is improved, and an efficiency curve moves up integrally. Meanwhile, the improvement in efficiency means reduction in loss, thereby being capable of reducing half-load temperature rise, and improving the reliability of the power supply.
Description
Technical field
The utility model relates to the self-regulating LED driving power of a kind of improved PFC voltage.
Background technology
It is current that energy crisis and climate warming show especially, and people are for energy conversion efficiency and utilize usefulness pay attention to day by day.In many energy standards, efficiency index is also from early stage full load efficiency, to efficiency curve requirement now etc.LED driving power whole efficiency has also proposed higher requirement.How current LED driving power has adopted the topological structure of PFC+LLC, after commercial power rectification, by pfc circuit, is converted into the fixedly direct current of 400V of bus, resupplies the LLC circuit of rear class.LLC is in input fixedly under the condition of 400V, and for meeting gamut output, the frequency-tuning range of LLC is very large by change.And LLC circuit characteristic determines, in the time of near resonance frequency, efficiency could maximize.The method of the fixedly PFC busbar voltage 400V that industry generally adopts at present, full load efficiency is maximum, but under semi-load and other loading conditions, efficiency is all lower, easily increases power supply internal temperature rise, and reliability also decreases.
Summary of the invention
The purpose of this utility model is to provide a kind of self-regulating LED driving power of improved PFC voltage that can improve LLC efficiency under wide output area.
For reaching goal of the invention the technical solution adopted in the utility model, be:
The self-regulating LED driving power of a kind of improved PFC voltage, comprise the input circuit, pfc circuit, the LLC circuit that connect successively, on described pfc circuit, be connected with PFC control circuit, on described PFC control circuit, be connected with PFC bus sample circuit, described PFC bus sample circuit is connected with LLC circuit, it is characterized in that: between described PFC control circuit and input circuit, be connected with input sampling circuit;
Described input circuit is for exporting to pfc circuit by input voltage;
Described pfc circuit is used for receiving the input voltage of input circuit output and the feedback voltage of PFC control circuit output, and the busbar voltage after proofreading and correct is exported to LLC circuit;
Described LLC circuit, for receiving the busbar voltage of pfc circuit output, is exported output voltage to LED load after conversion, and provides the required constant current of LED load to control simultaneously;
Described PFC control circuit is for receiving the sampled signal of PFC bus sample circuit and input sampling circuit, by the bus voltage signal of exporting corresponding adjustment pfc circuit output after two sampled signal integrated treatments to pfc circuit;
Described PFC bus sample circuit is used for the equivalent voltage of the output voltage of LLC circuit or output voltage to sample, and this sampled signal is exported to PFC control circuit;
Described input sampling circuit is used for the input voltage of input circuit to sample, and this sampled signal is exported to PFC control circuit.
Further, on described PFC bus sample circuit, be connected with auxiliary winding circuit, described auxiliary winding circuit is integrated on the main transformer of LLC circuit.
Or described PFC bus sample circuit is connected with the output of described LLC circuit by buffer circuit.
Further, described LLC circuit is half-bridge LLC circuit or full-bridge LLC circuit.
Further, the rectifying part of described auxiliary winding circuit is full-wave rectification or full-bridge rectification.
Further, described pfc circuit is analog circuit or digital circuit.
Technical conceive of the present utility model is: at LLC under constant current mode, when load variations, utilize former limit to assist winding coupled secondary output voltage, the input voltage vin of simultaneously sampling, by a series of sample circuits and sampling control circuit, final voltage signal is fed back to PFC control chip, reach according to the object of output voltage V out and the next corresponding adjustment of input voltage vin PFC busbar voltage Vbus.By this self-regulation means, at full output voltage range, make the operating frequency of LLC all the time at resonance frequency annex, the efficiency while having improved gamut load output reaches the object of improving temperature rise simultaneously.
The beneficial effects of the utility model are: LLC circuit always works near resonance frequency, have improved the efficiency of semi-load and other loading conditions, and efficiency curve moves on the whole.Meanwhile, the raising of efficiency, means the minimizing of loss, can reduce temperature rise semi-load, improves power supply reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment mono-.
Fig. 2 is the structural representation of the utility model embodiment bis-.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternatives, improvement project and the equivalents that within the scope of claims, may comprise.
Embodiment mono-
With reference to Fig. 1, the self-regulating LED driving power of a kind of improved PFC voltage, comprise the input circuit 1, pfc circuit 2, the LLC circuit 3 that connect successively, on described pfc circuit 2, be connected with PFC control circuit 6, the PFC bus sample circuit 5 being connected with on described PFC control circuit 6, described PFC bus sample circuit 5 is connected with LLC circuit 3, between described PFC control circuit 6 and input circuit 1, is connected with input sampling circuit 7;
Described input circuit 1 is for exporting to input voltage pfc circuit 2;
Described pfc circuit 2 is for receiving the input voltage of input circuit 1 output and the feedback voltage of PFC control circuit 6 outputs, and the busbar voltage Vbus after proofreading and correct is exported to LLC circuit 3;
Described LLC circuit 3, for receiving the busbar voltage Vbus of pfc circuit 2 outputs, is exported output voltage V out to LED load after conversion, and provides the required constant current of LED load to control simultaneously;
Described PFC control circuit 6 is for receiving the sampled signal of PFC bus sample circuit 5 and input sampling circuit 7, by the bus voltage signal of exporting corresponding adjustment pfc circuit 2 outputs after two sampled signal integrated treatments to pfc circuit 2;
Described PFC bus sample circuit 5 is for the equivalent voltage of the output voltage of LLC circuit 3 or output voltage is sampled, and this sampled signal is exported to PFC control circuit 6;
Described input sampling circuit 7 is for the input voltage of input circuit 1 is sampled, and this sampled signal is exported to PFC control circuit 6.
On described PFC bus sample circuit 5, be connected with auxiliary winding circuit 4, described auxiliary winding circuit 4 is integrated on the main transformer of LLC circuit 3.
Described LLC circuit 3 is half-bridge LLC circuit or full-bridge LLC circuit.
The rectifying part of described auxiliary winding circuit 4 is full-wave rectification or full-bridge rectification.
Described pfc circuit 2 is analog circuit or digital circuit.
Technical conceive of the present utility model is: at LLC under constant current mode, when load variations, utilize former limit to assist winding coupled secondary output voltage, the input voltage vin of simultaneously sampling, by a series of sample circuits and sampling control circuit, final voltage signal is fed back to PFC control chip, reach according to the object of output voltage V out and the next corresponding adjustment of input voltage vin PFC busbar voltage Vbus.By this self-regulation means, at full output voltage range, make the operating frequency of LLC all the time at resonance frequency annex, the efficiency while having improved gamut load output reaches the object of improving temperature rise simultaneously.
C1 in the present embodiment is the bus capacitor of pfc circuit 2, simultaneously also as the input capacitance of LLC circuit 3.In concrete circuit application, can be that an electric capacity is used separately, can be also that a plurality of Capacitance parallel connections are used; Metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, resonant inductance Lr, transformer T, resonant capacitance Cr form half-bridge LLC circuit, play voltage transformation; Auxiliary winding circuit 4 is integrated on main transformer, plays the object of coupling output voltage; PFC bus sample circuit 5 is connected to the auxiliary winding place of former avris, through auxiliary winding rectification, processes post-sampling boost voltage Vo1.The different winding rectifiers that are same transformers due to Vo1 and Vout obtain, so, and PFC bus sample circuit indirect detection output voltage V out.
While only introducing the sampled signal of PFC bus sample circuit 5 on PFC control circuit 6, when LLC circuit determines after resonant parameter and transformer turn ratio N.According to formula N=Vbus/Vout, PFC busbar voltage Vbus is with output voltage V out linear change.But actual conditions are, when specified input range, are the indexs such as assurance pfc circuit THD, PF, and PFC busbar voltage can not change according to formula N=Vbus/Vout completely, and it has individual bound voltage range, Vbus_min≤Vbus≤Vbus_max.PFC busbar voltage Vbus now and the adjusting relation of output voltage V out are as follows: 1. when (Vbus_min/N)≤Vout≤(Vbus_max/N), and Vbus=N*Vout; 2. when Vout < (Vbus_min/N), Vbus=Vbus_min; 3. when Vout > (Vbus_max/N), Vbus=Vbus_max.Generally, Vbus_min gets 350V, and Vbus_max gets 420V.Certainly, physical circuit is specifically applied, and the present invention does not limit the value of Vbus_min, Vbus_max.Under constant current mode, when output impedance reduces, output voltage V out reduces, and former limit coupled voltages Vo1 reduces, and the sampled signal of PFC bus sample circuit regulates through PFC control circuit, makes corresponding the reducing of PFC busbar voltage Vbus.In like manner, when output impedance increases, output voltage V out increases, and former limit coupled voltages Vo1 increases, and the sampled signal of PFC bus sample circuit regulates through PFC control circuit, through PFC control circuit, regulates, and makes the corresponding increase of PFC busbar voltage Vbus.
Due to PFC busbar voltage there is lower limit Vbus_min in Vbus, and while causing output voltage V out to be less than certain value, PFC busbar voltage Vbus can not continue to decline.Output voltage V out is less, and the operating frequency of LLC circuit is got over off-resonance frequency, and efficiency is lower.The adjustable range relative narrower of output voltage V out under LLC optimum Working, for improving the adjustable range of the output voltage V out under LLC optimum Working, the present embodiment has also increased input sampling circuit 2, and input sampling circuit 2 detects the input voltage vin of input circuit 1.The sampled signal of the sampled signal of input sampling circuit 2 and PFC bus sample circuit 5 is sent into PFC control circuit 6 simultaneously, through the integrated treatment of PFC control circuit 6, controls pfc circuit 2 again.
When input voltage vin is less than Vin_min, Vbus is below Vbus_min for PFC busbar voltage, and pfc circuit still can work.Input voltage vin is less, and PFC busbar voltage Vbus can be less, means that output voltage V out can be less.
Now the adjusting relation of PFC busbar voltage Vbus and output voltage V out is as follows: 1. when input voltage vin >=Vin_min, the adjusting relation of PFC busbar voltage Vbus and output voltage V out during as above-mentioned the sampled signal of introducing PFC bus sample circuit as described in; 2. when input voltage vin < Vin_min, Vbus can be less than Vbus_min, analogy when the adjusting relation of PFC busbar voltage Vbus and output voltage V out can be with reference to above-mentioned the sampled signal of introducing PFC bus sample circuit, also can do other accommodations.
Embodiment bis-
With reference to Fig. 2, the present embodiment is that with the difference of embodiment mono-described PFC bus sample circuit 5 is connected with the output of described LLC circuit 3 by buffer circuit 8.The PFC bus sample circuit 5 of the present embodiment is directly sampled to the output voltage V out of LLC circuit 3.Remaining 26S Proteasome Structure and Function is all identical with embodiment mono-.
Claims (6)
1. the self-regulating LED driving power of improved PFC voltage, comprise the input circuit, pfc circuit, the LLC circuit that connect successively, on described pfc circuit, be connected with PFC control circuit, the PFC bus sample circuit being connected with on described PFC control circuit, described PFC bus sample circuit is connected with LLC circuit, it is characterized in that: between described PFC control circuit and input circuit, be connected with input sampling circuit;
Described input circuit is for exporting to pfc circuit by input voltage;
Described pfc circuit is used for receiving the input voltage of input circuit output and the feedback voltage of PFC control circuit output, and the busbar voltage after proofreading and correct is exported to LLC circuit;
Described LLC circuit, for receiving the busbar voltage of pfc circuit output, is exported output voltage to LED load after conversion, and provides the required constant current of LED load to control simultaneously;
Described PFC control circuit is for receiving the sampled signal of PFC bus sample circuit and input sampling circuit, by the bus voltage signal of exporting corresponding adjustment pfc circuit output after two sampled signal integrated treatments to pfc circuit;
Described PFC bus sample circuit is used for the equivalent voltage of the output voltage of LLC circuit or output voltage to sample, and this sampled signal is exported to PFC control circuit;
Described input sampling circuit is used for the input voltage of input circuit to sample, and this sampled signal is exported to PFC control circuit.
2. the self-regulating LED driving power of a kind of improved PFC voltage according to claim 1, is characterized in that: on described PFC bus sample circuit, be connected with auxiliary winding circuit, described auxiliary winding circuit is integrated on the main transformer of LLC circuit.
3. the self-regulating LED driving power of a kind of improved PFC voltage according to claim 1, is characterized in that: described PFC bus sample circuit is connected with the output of described LLC circuit by buffer circuit.
4. the self-regulating LED driving power of a kind of improved PFC voltage according to claim 2, is characterized in that: the rectifying part of described auxiliary winding circuit is full-wave rectification or full-bridge rectification.
5. according to the self-regulating LED driving power of a kind of improved PFC voltage one of claim 1～4 Suo Shu, it is characterized in that: described LLC circuit is half-bridge LLC circuit or full-bridge LLC circuit.
6. the self-regulating LED driving power of a kind of improved PFC voltage according to claim 5, is characterized in that described pfc circuit is analog circuit or digital circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557337.3U CN203482459U (en) | 2013-09-09 | 2013-09-09 | Improved LED driving power supply with self-regulation PFC voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557337.3U CN203482459U (en) | 2013-09-09 | 2013-09-09 | Improved LED driving power supply with self-regulation PFC voltage |
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| CN203482459U true CN203482459U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320557337.3U Expired - Lifetime CN203482459U (en) | 2013-09-09 | 2013-09-09 | Improved LED driving power supply with self-regulation PFC voltage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006975A (en) * | 2015-08-07 | 2015-10-28 | 西南交通大学 | Frequency converting control method of LLC resonant converter and apparatus thereof |
| CN105992425A (en) * | 2015-01-29 | 2016-10-05 | 赛尔富电子有限公司 | LED drive circuit and current output control method of LED driver |
| CN109121252A (en) * | 2018-09-25 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of LED drive power |
-
2013
- 2013-09-09 CN CN201320557337.3U patent/CN203482459U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992425A (en) * | 2015-01-29 | 2016-10-05 | 赛尔富电子有限公司 | LED drive circuit and current output control method of LED driver |
| CN105992425B (en) * | 2015-01-29 | 2018-07-17 | 赛尔富电子有限公司 | A kind of electric current output control method of LED drive circuit and LED driver |
| CN105006975A (en) * | 2015-08-07 | 2015-10-28 | 西南交通大学 | Frequency converting control method of LLC resonant converter and apparatus thereof |
| CN109121252A (en) * | 2018-09-25 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of LED drive power |
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