CN101534056B - Output adjustable structure-changeable direct current switch power supply - Google Patents
Output adjustable structure-changeable direct current switch power supply Download PDFInfo
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- CN101534056B CN101534056B CN2009101036300A CN200910103630A CN101534056B CN 101534056 B CN101534056 B CN 101534056B CN 2009101036300 A CN2009101036300 A CN 2009101036300A CN 200910103630 A CN200910103630 A CN 200910103630A CN 101534056 B CN101534056 B CN 101534056B
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Abstract
An output adjustable changeable structural direct current switch power supply comprises a full-bridge dc converter, a high frequency transformer, two single-phase diode rectifier bridges, a low frequency switch power switching tube, and two bypass diodes. The low frequency switch power switching tube and the bypass diodes are respectively connected between positive and negative output ends of thesingle-phase diode rectifier bridges and switch power supply to change output way agilely by control of low frequency switch power switching tube, which may be parallel operation and wound operation,being a structural changeable dc switch power supply. The invention is especially applicable for the switch power supply application field with output in wide scale adjustment. Compared with wide scale adjustment technology in prior art, adjusting scale of output voltage and current is greater and voltage and current stress of the diode rectifier bridge is reduced, which simplifies design of the high frequency transformer, improves efficiency and reduces cost.
Description
Technical field
The invention belongs to the direct-current switch power supply technical field, particularly a kind of adjustable direct-current switch power supply of wide region of exporting.
Background technology
Direct-current switch power supply is widely used in various electronic equipments; and,, require power supply that the output adjustable range of broad is arranged as the research and development and the breadboard testing power supply of electronic equipment in some special applications; the precision of voltage regulation, certain power output and perfect defencive function preferably.This class power supply is the required power factor correcting often, direct voltage is about 400V after the employing PFC technology, and output voltage changes to several hectovolts at tens volts, back level converter should have boost function, buck functionality is arranged again, can also realize simultaneously isolating and bigger power output, and have the restriction of permanent power requirement, make the design of switch power supply system and realization face great challenge.In the research of wide region direct-current switch power supply there be the main method that adopts at present: the compound modulation of modulating frequency and width combination, the mode of change transformer voltage ratio is improved the mode that circuit structure is widened adjustable range, adopts the mode of misphase control etc.And in the existing method, adopt the method for frequency conversion or resonance need change frequency, increased transformer and Filter Design difficulty; Utilize switch to switch the method that changes transformer voltage ratio, just increased the adjustable range of voltage, and be not suitable for the occasion of big voltage or big electric current; The control method of misphase can realize seamlessly transitting of voltage-regulation, but adjustable range is limited.
Change transformer voltage ratio by increasing the power switched switching tube, the circuit that increases the voltage-regulation scope is applied in the front end converter of distributed power supply system, but its range of regulation is limited, it is adjustable in a big way and have a requirement of permanent power control to satisfy output, and the research of the direct-current switch power supply that the output voltage electric current is all changed in relative broad range does not still have report and research.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide that a kind of circuit structure is simple, flexibility is high, cost is relatively low, and can realize output voltage continuously adjustable direct-current switch power supply in relative broad range with permanent power requirement.
The invention provides technical scheme is a kind of adjustable changeable structural direct current switch power supply of wide region of exporting, and this direct-current switch power supply comprises the high frequency transformer of a full-bridge direct current converter, two windings of the winding secondary in former limit, two single-phase diode rectifier bridges, a low frequency power switched switching tube and two bypass diodes.The former limit of high frequency transformer is connected on the full-bridge direct current converter, two windings of this high frequency transformer secondary are connected with each single-phase diode rectifier bridge respectively separately, are connecting and comprise a low frequency power switched switching tube, two bypass diodes, an output inductor and a filter capacitor that is connected in parallel on this direct-current switch power supply output between two single-phase diode rectifier bridges and between the output.Wherein: the cathode output end of first single-phase diode rectifier bridge links to each other with output inductor, the cathode output end of second single-phase diode rectifier bridge links to each other with the negative pole of filter capacitor, and the cathode output end of this single-phase diode rectifier bridge links to each other with the cathode output end of first single-phase diode rectifier bridge by low frequency power switched switching tube; The negative electrode of a bypass diode and anode are connected to cathode output end and the node place between this low frequency power switched switching tube input and the node place of filter capacitor negative pole of first single-phase diode rectifier bridge; The negative electrode of another bypass diode and anode are connected to the cathode output end of the cathode output end of first single-phase diode rectifier bridge and the node place between the output inductor and second single-phase diode rectifier bridge and the node place between this low frequency power switched switching tube output.
Compared to existing technology, the present invention has following beneficial effect:
Compare with existing wide region direct-current switch power supply, this direct-current switch power supply that becomes structure is simple in structure, can realize the adjusting on a large scale of output voltage and electric current, and can series operation when output HIGH voltage, can parallel running when exporting big electric current, compound mode is flexible, has simplified Design of High Frequency Transformer.Simultaneously, the power switched switching tube of the direct-current switch power supply of this change structure and bypass diode all are operated under the low frequency state, its cost and switching loss are all smaller, and under compound mode flexibly, the voltage and current stress of high-frequency rectification diode is all smaller, improved the efficient of system, reduced the cost of system, made it in industry, to be widely used.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
The schematic diagram of Fig. 1---changeable structural direct current switch power supply of the present invention
Fig. 2---secondary increases the schematic diagram of the present invention in a loop
Fig. 3 a---rectifier bridge FBR1 output voltage waveforms during series operation
Fig. 3 b---rectifier bridge FBR2 output voltage waveforms during series operation
Fig. 3 c---the voltage waveform of AB point-to-point transmission in the schematic diagram of Fig. 1 during series operation
Fig. 4 a---the current waveform during parallel running on the bypass diode D11
Fig. 4 b---the current waveform during parallel running on the bypass diode D12
Fig. 4 c---the current waveform during parallel running on the output inductor L
Fig. 4 d---the output voltage waveforms of Fig. 1 schematic diagram during parallel running
Fig. 5 a---the drive signal of power switched switching tube S1 when output voltage is regulated
Fig. 5 b---the output voltage waveforms of Fig. 1 schematic diagram when output voltage is regulated
Embodiment
Referring to Fig. 1, a kind of adjustable changeable structural direct current switch power supply of wide region of exporting, this direct-current switch power supply comprises a full-bridge direct current converter (FBC), the high frequency transformer (T1) that constitutes by the winding in former limit and two windings of secondary, two single-phase diode rectifier bridge (FBR1, FBR2), a low frequency power switched switching tube (S1) and two bypass diodes (D11, D12); Former limit winding (np1) of high frequency transformer (T1) is connected on the full-bridge direct current converter (FBC), two winding (ns1 of high frequency transformer (T1) secondary, ns2), they separately respectively with each single-phase diode rectifier bridge (FBR1, FBR2) connect, at two single-phase diode rectifier bridge (FBR1, FBR2) connected respectively between the output comprise low frequency power switched switching tube (S1), two bypass diodes (D11, D12), an output inductor (L) and a filter capacitor (C) that is connected in parallel on this dc power output end; Wherein, the cathode output end of first single-phase diode rectifier bridge (FBR1) links to each other with output inductor (L), the cathode output end of second single-phase diode rectifier bridge (FBR2) links to each other with the negative pole of filter capacitor (C), and the cathode output end of this single-phase diode rectifier bridge (FBR2) links to each other with the cathode output end of first single-phase diode rectifier bridge (FBR1) by low frequency power switched switching tube (S1); The negative electrode of a bypass diode (D12) and anode are connected to cathode output end and the node place between this low frequency power switched switching tube (S1) input and the node place of filter capacitor (C) negative pole of first single-phase diode rectifier bridge (FBR1); Negative electrode of another bypass diode (D11) and anode are connected to cathode output end and the cathode output end of the node place between the output inductor (L) and second single-phase diode rectifier bridge (FBR2) and the node place between this low frequency power switched switching tube (S1) output of first single-phase diode rectifier bridge (FBR1).
Further, former limit winding (np1) of described high frequency transformer T1 can link to each other with full-bridge direct current converter, also can link to each other with the half-bridge DC converter, and just the full-bridge direct current converter FBC among Fig. 1 can change the half-bridge DC converter into.
Again further, for simplifying high frequency transformer magnetic core and Winding Design, described high frequency transformer can be made up of two transformers, each winding of its former secondary, its limit, Central Plains winding parallel connection, secondary winding (ns1) is corresponding to first high frequency transformer, and secondary winding (ns2) is corresponding to another high frequency transformer.
Further say, for the adjustable range that makes this direct-current switch power supply output voltage electric current bigger, secondary at described high frequency transformer has increased a winding (ns3), a single-phase diode rectifier bridge (FBR3), a low frequency power switched switching tube (S2) and two bypass diode (D21, D22) (with reference to figure 2) further increases the adjustable range of output.The cathode output end of the 3rd single-phase diode rectifier bridge (FBR3) links to each other with the negative pole of filter capacitor (C), and the cathode output end of this single-phase diode rectifier bridge (FBR3) links to each other with the cathode output end of second single-phase diode rectifier bridge (FBR2) by a low frequency power switched switching tube (S2); The negative electrode of bypass diode (D22) and anode are connected to cathode output end and the node place between this low frequency power switched switching tube (S2) input and the node place of filter capacitor (C) negative pole of second single-phase diode rectifier bridge (FBR2); Negative electrode of another bypass diode (D21) and anode are connected to cathode output end and the cathode output end of node place between the output inductor (L) and the 3rd single-phase diode rectifier bridge (FBR3) and the node place between this low frequency power switched switching tube (S2) output of first single-phase diode rectifier bridge (FBR1).If need bigger output adjustable range, can continue to increase the secondary winding number of high frequency transformer according to this connection.
Below in conjunction with above-mentioned embodiment its change structure and operation principle are further described.
Referring to Fig. 1, the present invention exports the adjustable changeable structural direct current switch power supply of wide region, sets the threshold value V of output voltage earlier
0L, when the output voltage of needs greater than preset threshold voltage V
0LThe time, power switched switching tube S1 conducting, two single-phase diode rectifier bridge FBR1 of secondary and FBR2 series connection output reduce to export the voltage stress of rectifier diode; When the output voltage of needs less than preset threshold voltage V
0LThe time, power switched switching tube S1 turn-offs, and two single-phase diode rectifier bridge FBR1 of secondary and FBR2 output in parallel reduce to export the current stress of rectifier diode; The output because output both can have been connected can in parallel be exported again, has been equivalent to change the no-load voltage ratio of transformer, has increased the adjustable range of output.Fig. 3 a, Fig. 3 b, Fig. 3 c are respectively among the present invention during power switched switching tube S1 conducting, when being two single-phase diode rectifier bridge FBR1 of secondary and FBR2 series connection output, output filter (the L of single-phase diode rectifier bridge FBR1, single-phase diode rectifier bridge FBR2 and changeable structural direct current switch power supply, C) before the voltage waveform of (AB point-to-point transmission among Fig. 1), the output voltage sum of two of secondary single-phase diode rectifier bridge FBR1 and FBR2 equals output voltage among the present invention as can be seen from Figure 3, and promptly FBR1 and FBR2 are series connection output.Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d are respectively when power switched switching tube S1 turn-offs among the present invention, when being two single-phase diode rectifier bridge FBR1 of secondary and FBR2 output in parallel, the current waveform on bypass diode D11, bypass diode D12 and the output inductor L and the output voltage waveforms of changeable structural direct current switch power supply, the electric current sum that flows through secondary two single-phase diode rectifier bridges FBR1 and FBR2 as can be seen from Figure 4 among the present invention equals to flow through the electric current of output inductor L, and promptly FBR1 and FBR2 are connection output in parallel.Fig. 5 a, Fig. 5 b are respectively the drive signal waveform of power switched switching tube S1 and the waveform of output voltage, as can be seen from Figure 5 when crossing over preset threshold voltage between the regulatory region of output voltage, output voltage of the present invention can change to another voltage setting value from a voltage setting value quickly, and can guarantee good output stability.
The operation principle of Fig. 2 and other distressed structures that the present invention relates to is identical with it, is not repeated.
The present invention only needs a low frequency power switched switching tube, increase the adjustable range of output, realized the flexible combination of output-parallel/series connection, reduced the electric current and voltage stress of output rectifier diode, simplify Design of High Frequency Transformer, reduced cost effectively.The principle that the selection of inductance, electric capacity, transformer and power switch pipe and existing direct-current switch power supply are selected among the present invention is similar, so concrete parameter does not disclose at this.
Claims (1)
1. export adjustable direct-current switch power supply for one kind, it is characterized in that, this direct-current switch power supply comprises DC converter (FBC), high frequency transformer (T1), at least two single-phase diode rectifier bridge (FBR1, FBR2), the first low frequency power switched switching tube (S1) and first, second bypass diode (the D11, D12): former limit winding (np1) of high frequency transformer (T1) is connected in the output of DC converter (FBC), two winding (ns1 of high frequency transformer (T1) secondary, ns2) respectively with each single-phase diode rectifier bridge (FBR1, FBR2) connect, at two single-phase diode rectifier bridge (FBR1, FBR2) connected the first low frequency power switched switching tube (S1) between the output respectively, first, second bypass diode (D11, D12), an output inductor (L) and a filter capacitor (C) that is connected in parallel on this direct-current switch power supply output; Wherein, the cathode output end of first single-phase diode rectifier bridge (FBR1) links to each other with output inductor (L), and the other end of output inductor (L) links to each other with the positive pole of filter capacitor (C); The cathode output end of second single-phase diode rectifier bridge (FBR2) links to each other with the negative pole of filter capacitor (C), and the cathode output end of this single-phase diode rectifier bridge (FBR2) links to each other with the cathode output end of first single-phase diode rectifier bridge (FBR1) by the first low frequency power switched switching tube (S1); The negative electrode of second bypass diode (D12) and anode are connected to the cathode output end of first single-phase diode rectifier bridge (FBR1) and the node place between first low frequency power switched switching tube (S1) input, the node place of filter capacitor (C) negative pole; The negative electrode of first bypass diode (D11) and anode are connected to cathode output end and the node place between the output inductor (L), the cathode output end of second single-phase diode rectifier bridge (FBR2) and the node place between first low frequency power switched switching tube (S1) output of first single-phase diode rectifier bridge (FBR1); Described DC converter (FBC) is a full-bridge direct current converter; A secondary increase winding (ns3), a single-phase diode rectifier bridge (FBR3), the second low frequency power switched switching tube (S2) and the 3rd, the 4th bypass diode of described high frequency transformer (T1) (D21, D22); Wherein, the cathode output end of the 3rd single-phase diode rectifier bridge (FBR3) replaces the cathode output end of second unilateral diode rectifier bridge (FBR2) to link to each other with the negative pole of filter capacitor (C), and the cathode output end of the 3rd single-phase diode rectifier bridge (FBR3) links to each other with the cathode output end of second single-phase diode rectifier bridge (FBR2) by the second low frequency power switched switching tube (S2): the negative electrode of the 4th bypass diode (D22) and anode are connected to the cathode output end of second single-phase diode rectifier bridge (FBR2) and the node place between second low frequency power switched switching tube (S2) input, the node place of filter capacitor (C) negative pole: the negative electrode of the 3rd bypass diode (D21) and anode are connected to the cathode output end of first single-phase diode rectifier bridge (FBR1) and the node place between the output inductor (L), node place between the cathode output end of the 3rd single-phase diode rectifier bridge (FBR3) and second low frequency power switched switching tube (S2) output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101036300A CN101534056B (en) | 2009-04-17 | 2009-04-17 | Output adjustable structure-changeable direct current switch power supply |
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| CN2009101036300A CN101534056B (en) | 2009-04-17 | 2009-04-17 | Output adjustable structure-changeable direct current switch power supply |
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| CN101534056B true CN101534056B (en) | 2011-03-23 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103248243A (en) * | 2013-05-20 | 2013-08-14 | 镇江天力变压器有限公司 | High-frequent dual-splitting rectifying transformer |
| CN105991044B (en) * | 2015-02-17 | 2022-01-21 | 南京航空航天大学 | Non-contact power supply secondary side rectifying circuit and method |
| CN105529933B (en) * | 2016-03-07 | 2019-03-05 | 深圳晶福源科技股份有限公司 | Dsp controller and three Level Full Bridge LLC converters and control method with it |
| CN106411109B (en) * | 2016-09-30 | 2019-07-26 | 许继电源有限公司 | A kind of high-low pressure switching circuit of LLC transformation output |
| CN110635696A (en) * | 2018-06-25 | 2019-12-31 | 台达电子工业股份有限公司 | Power supply switching circuit and switching method |
| CN111446872B (en) * | 2020-04-01 | 2021-08-31 | 石家庄通合电子科技股份有限公司 | Transformer transformation ratio adjustable wide-range constant power output switching circuit |
| CN112202332A (en) * | 2020-11-30 | 2021-01-08 | 深圳英飞源技术有限公司 | Full-bridge filter circuit, direct current converter and charging terminal |
| CN113271029A (en) * | 2021-05-28 | 2021-08-17 | 青岛大学 | DAB type single-stage bidirectional AC/DC converter with low voltage stress and wide output range |
| CN113890367A (en) * | 2021-08-25 | 2022-01-04 | 深圳航天科技创新研究院 | Reconfigurable resonance type wide-voltage-range power converter circuit |
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