CN101534057A - A double-isolation boosting and step-down multi-input direct current convertor - Google Patents
A double-isolation boosting and step-down multi-input direct current convertor Download PDFInfo
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Abstract
The invention relates to a double-isolation boosting and step-down multi-input direct current convertor. The circuit structure thereof is formed by connecting multiple high frequency inverter circuits which are isolated from one another and have input LC filters with a shared output rectifying filter circuit through a multi-input single-output high frequency energy storage transformer. Each output end of the high frequency energy storage transformer is connected with the output end of each high frequency inverter circuit one by one. The output end of the high frequency energy storage transformer is connected with the input end of the output rectifying filter circuit. The invention has the input direct current electric sources in the same place or different places, double isolations among the high frequency inverter circuits and between the input and the output, and strong voltage matching capacity. Multiple input electric sources supply power according to different time, and the circuit topology is the simplest. The high frequency energy storage transformer and an output loop are shared. The power density is high, the conversion efficiency is high, the reliability is high in the load short circuit and the cost is low. The invention provides a key technique for low- and small-power distributed power supply system associatively supplying power by multiple reproducible energy sources.
Description
Technical field
Double-isolation boosting and step-down multi-input direct current convertor involved in the present invention belongs to the Technics of Power Electronic Conversion technology.
Background technology
DC converter is the applied power semiconductor device, and a kind of direct current energy is transformed into the static converting means of another kind of direct current energy, uses for DC load.The converter of high frequency electrical isolation is arranged between output DC load and input DC power, be called isolated DC transducer.The high frequency electrical isolation element has mainly played following effect in converter: 1) realized the electrical isolation between converter output and the input, improved the security reliability and the Electro Magnetic Compatibility of converter operation; 2) realized coupling between converter output voltage and the input voltage, realized promptly that the output voltage of converter can be higher than, be equal to or less than the technique effect of input voltage that its range of application has obtained widening greatly; 3) when the operating frequency of high frequency transformer or high frequency storage transformer when 20kHz is above, its volume, weight greatly reduce, audio noise has been eliminated.Therefore, be the secondary transformation of electrical energy occasion of main dc power supply with DC generator, storage battery, solar cell and fuel cell etc., isolated DC transducer has important use and is worth.
Regenerative resources (being also referred to as green energy resource) such as solar energy, wind energy, tidal energy and geothermal energy have cleanliness without any pollution, cheapness, advantage such as reliable, abundant, thereby are with a wide range of applications.Because fossil energy (the non-renewable energy) growing tensions such as oil, coal and natural gas, environmental pollution are serious, cause the production of global warming and nuclear energy can produce reasons such as nuke rubbish and contaminated environment again, the development and utilization of regenerative resource more and more is subject to people's attention.Renewable energy power generation mainly contains types such as photovoltaic, wind-force, fuel cell, waterpower, underground heat, all exist the supply of electric power instability, discontinuous, with defectives such as weather conditions variations, therefore need to adopt various energy resources to unite the distributed power supply system of power supply.
Traditional regenerative resource distributed power supply system, as shown in Figure 1.This system normally adopts a plurality of single input DC converter that the direct current of renewable energy power generation equipment such as solar cell, fuel cell, wind-driven generator output is transformed into the needed common DC bus voltage U of load converter
Dc, and then by the load converter that links to each other with dc bus with U
DcBe transformed into needed direct current of load or alternating voltage, select the type of load converter according to the character of load.In order to make the renewable energy power generation part can co-ordination, various energy resources must carry out respectively being connected on the public dc bus behind the transformation of electrical energy, therefore need a plurality of single input DC converter and in addition in parallel, thereby have defectives such as circuit structure complexity, cost height at output.
In order to simplify circuit structure, can replace a plurality of single input DC converter with a multi-input direct current converter, form novel regenerative resource distributed power supply system, as shown in Figure 2.Multi-input direct current converter allows the various energy resources input, and the character of input source, amplitude and characteristic can be identical, and is also can difference very big.This electric power system has that circuit structure is succinct, cost is low, in HF switch cycle a plurality of input sources can be simultaneously or timesharing powers to the load, can improve system stability and flexibility, can realize the advantages such as preferential utilization of the energy.
Therefore, seeking a class, to allow multiple regenerative resource to unite the multi-input direct current converter of power supply extremely urgent, for the simplified system circuit structure, reduce cost, allow a HF switch in the cycle a plurality of input sources simultaneously or the timesharing preferential utilization that powers to the load, improve the stability of system and flexibility, realization regenerative resource will have crucial meaning.
Summary of the invention
The present invention seeks to provide a kind of and do not have input DC power altogether or not altogether, between the high-frequency inverter circuit and two isolation between output and the input, the voltage matches ability is strong, a plurality of input power supply time sharing power supplies, circuit topology is the most succinct, shared high frequency storage transformer and output loop, the power density height, the conversion efficiency height, reliability height during load short circuits, be suitable for middle low power output, cost is low, the double-isolation boosting and step-down multi-input direct current convertor of advantages such as application prospect is extensive.
Double-isolation boosting and step-down multi-input direct current convertor of the present invention, be with a plurality of mutual isolation by the high frequency storage transformer of the single output of input more than, high-frequency inverter circuit and a shared output rectifier and filter of having input LC filter connect formation, each input of high frequency storage transformer and the corresponding one by one connection of the output of each high-frequency inverter circuit, the output of high frequency storage transformer and the input of output rectifier and filter link, described each have the high-frequency inverter circuit of input LC filter by input LC filter, high-frequency inverter cascade in regular turn constitutes, and described output rectifier and filter is by hf rectifier, the cascade in regular turn of output capacitance filter constitutes.
The present invention is with a plurality of single input DC converter circuit structure of output parallel connection in traditional regenerative resource distributed power supply system, be configured to the double-isolation boosting and step-down multi-input direct current convertor circuit structure, proposed double-isolation boosting and step-down multi-input direct current convertor new ideas, circuit structure and topological family.
Double-isolation boosting and step-down multi-input direct current convertor of the present invention, can with a plurality of altogether or not altogether, unsettled input direct voltage is transformed into a required voltage size, stable, high-quality output dc voltage does not have input DC power altogether or not altogether, between the high-frequency inverter circuit and two isolation between output and the input, the voltage matches ability is strong, many input power supply time sharing power supplies, circuit topology is the most succinct, shared high frequency storage transformer and output loop, the power density height, the conversion efficiency height, reliability height during load short circuits, cost is low, advantages such as application prospect is extensive.The combination property of double-isolation boosting and step-down multi-input direct current convertor will be more superior than a plurality of single input DC converter of traditional output parallel connection.
Description of drawings
Fig. 1, traditional regenerative resource distributed power supply system.
Fig. 2, novel regenerative resource distributed power supply system.
Fig. 3, the double-isolation boosting and step-down multi-input direct current convertor theory diagram.
Fig. 4, the double-isolation boosting and step-down multi-input direct current convertor circuit structure diagram.
Fig. 5, principle oscillogram during the double-isolation boosting and step-down multi-input direct current convertor time sharing power supply.
Fig. 6, double-isolation boosting and step-down multi-input direct current convertor circuit topology example one---two-tube reverse excitation circuit schematic diagram.
Fig. 7, double-isolation boosting and step-down multi-input direct current convertor circuit topology example two---the two-tube reverse excitation circuit schematic diagram of paralleling and interleaving.
Fig. 8, double-isolation boosting and step-down multi-input direct current convertor circuit topology example three---paralleling and interleaving single tube reverse excitation circuit schematic diagram.
Fig. 9, master-slave mode voltage, current instantaneous value FEEDBACK CONTROL block diagram during the double-isolation boosting and step-down multi-input direct current convertor time sharing power supply.
Figure 10, master-slave mode voltage, current instantaneous value feedback control principle oscillogram during the double-isolation boosting and step-down multi-input direct current convertor time sharing power supply.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
The double-isolation boosting and step-down multi-input direct current convertor circuit structure, be with a plurality of mutual isolation by the high frequency storage transformer of the single output of input more than, high-frequency inverter circuit and a shared output rectifier and filter of having input LC filter connect formation, each input of high frequency storage transformer and the corresponding one by one connection of the output of each high-frequency inverter circuit, the output of high frequency storage transformer and the input of output rectifier and filter link, described each have the high-frequency inverter circuit of input LC filter by input LC filter, high-frequency inverter cascade in regular turn constitutes, and described output rectifier and filter is by hf rectifier, the cascade in regular turn of output capacitance filter constitutes.
Principle waveform when double-isolation boosting and step-down multi-input direct current convertor theory diagram, circuit structure, time sharing power supply is respectively shown in Fig. 3,4,5.Because double-isolation boosting and step-down multi-input direct current convertor is a current type converter, its principle is equivalent to the stack of a plurality of buck-boost type list input DC converter at the input electric current, i.e. output voltage U
oWith input direct voltage (U
I1, U
I2..., U
In), the high frequency transformer turn ratio (N
2/ N
11, N
2/ N
12..., N
2/ N
1n), duty ratio (D
1, D
2..., D
n) between the pass be U
o=(D
1U
I1N
2/ N
11+ D
2U
I2N
2/ N
12+ ... + D
nU
InN
2/ N
1n)/(1-D
1-D
2-...-D
n).U
oAt suitable duty ratio (D
1, D
2..., D
n) and the high frequency storage transformer turn ratio (N
2/ N
11, N
2/ N
12..., N
2/ N
1n) time can greater than, be equal to or less than U
I1+ U
I2+ ... + U
InSo the high frequency transformer in this quasi-converter circuit structure has not only played security reliability and the Electro Magnetic Compatibility that improves the converter operation, the more important thing is the effect of having played matched output voltage and input voltage, realized that promptly the output voltage of converter is higher than, be equal to or less than input direct voltage sum U
I1+ U
I2+ ... + U
InTechnique effect, its range of application has obtained widening greatly.As 0.5＜D
1+ D
2+ ... + D
n＜1 or 0＜D
1+ D
2+ ... + D
n, there is U respectively at＜0.5 o'clock
oU
I1N
2/ N
11+ U
I2N
2/ N
12+ ... + U
InN
2/ N
1nOr U
o＜U
I1N
2/ N
11+ U
I2N
2/ N
12+ ... + U
InN
2/ N
1n, i.e. output dc voltage U
oBe higher or lower than input direct voltage (U
I1, U
I2..., U
In) and the high frequency transformer turn ratio (N
2/ N
11, N
2/ N
12..., N
2/ N
1n) the sum of products (U
I1N
2/ N
11+ U
I2N
2/ N
12+ ... + U
InN
2/ N
1n); Because the n of converter isolates individual having between the high-frequency inverter circuit of importing the LC filter mutually, isolation mutually between converter output DC load and the input power supply is so be called double-isolation boosting and step-down multi-input direct current convertor with this quasi-converter again.High-frequency inverter in this circuit structure is made of a plurality of two quadrant high frequency power switches that can bear bi-directional voltage stress, unidirectional current stress, and hf rectifier is made of one or more high-frequency rectification diodes.N input source of this circuit structure can only be powered to DC load in the cycle a HF switch in timesharing, and duty ratio can identical (D
1=D
2=...=D
n), also can different (D
1≠ D
2≠ ... ≠ D
n).
When power supply during to load transfer power, high-frequency inverter is modulated into the high frequency pulse dc current i with input direct voltage
Ni1, i
Ni2..., i
Nin, after high frequency storage transformer T electrical isolation, transmission and currents match, behind high-frequency rectification, capacitive filter, obtain high-quality direct voltage U
o, the high frequency pulse dc current i
N11, i
N12..., i
N1nThrough input LC filter L
I1-C
I1, L
I2-C
I2..., L
In-C
InThe back is at input DC power U
I1, U
I2..., U
InIn can obtain level and smooth input dc power stream I
I1, I
I2..., I
InA HF switch in the cycle, each high frequency pulse dc current i
N12, i
N12..., i
N1nInitial value and i
N11, i
N12..., i
N1 (n-1)Peak value satisfy the magnetic potential balance equation.
Double-isolation boosting and step-down multi-input direct current convertor of the present invention, because a shared high frequency storage transformer and an output rectifier and filter, a plurality of single input DC converter circuit structures in parallel with output in the traditional regenerative resource distributed power supply system exist important difference.Therefore, converter of the present invention is creative, have between the high-frequency inverter circuit and output and input between reliability height when pair isolation, conversion efficiency height (meaning that energy loss is little), power density height (mean volume, weight little), load short circuits, advantage such as cost is low, application prospect is extensive, build today energy-saving, conservation-minded society vigorously advocating, have more important value.
The double-isolation boosting and step-down multi-input direct current convertor circuit topology embodiment of family is shown in Fig. 6,7,8.Fig. 6 is two-tube reverse excitation circuit, and Fig. 7 is the two-tube reverse excitation circuit of paralleling and interleaving, and Fig. 8 is a paralleling and interleaving single tube reverse excitation circuit.Clamping diode circuit among Fig. 6,7 is to be used for suppressing the shutoff voltage spike that the former limit of high frequency storage transformer leakage inductance causes.From the high-frequency inverter side, the voltage stress of two-tube inverse-excitation type, the two-tube reverse excitation circuit high frequency power of paralleling and interleaving switch is input voltage value (U
I1, U
I2..., U
In), the voltage stress of paralleling and interleaving single tube reverse excitation circuit high frequency power switch is input voltage value and converts the output voltage values (U on former limit
I1+ U
0N
11/ N
2, U
I2+ U
0N
12/ N
2..., U
In+ U
0N
1n/ N
2).From the output hf rectifier, the voltage stress of high-frequency rectification diode is input voltage value and the output voltage values sum [max (U that secondary is arrived in maximum conversion
I1N
2/ N
11, U
I2N
2/ N
12..., U
InN
n/ N
1n)+U
0].Two-tube inverse-excitation type, the two-tube reverse excitation circuit of paralleling and interleaving are applicable to high pressure input conversion occasion, and paralleling and interleaving single tube reverse excitation circuit is applicable to low pressure input conversion occasion.The two-tube inverse-excitation type of paralleling and interleaving, paralleling and interleaving single tube reverse excitation circuit are applicable to middle Power Conversion occasion, and two-tube reverse excitation circuit is applicable to small-power conversion occasion.This circuit topology family be applicable to a plurality of altogether or not altogether, unsettled input direct voltage is transformed into a required voltage size, stable, high-quality output dc voltage, can be used to realize to have the multi-input direct current converter in the novel renewable energy middle low power distributed power supply system of premium properties and wide application prospect, as photovoltaic cell 40-60VDC/360VDC, 10kw Proton Exchange Membrane Fuel Cells 85-120V/360VDC, middle-size and small-size family wind power generation 24-36-48VDC/360VDC, multiple input sources such as large-scale wind generating 1000VDC/360VDC are powered to DC load.
Double-isolation boosting and step-down multi-input direct current convertor can be used to realize the various energy resources time sharing power supply, can adopt the 1st, 2 ..., n-1 road power output is fixed and the n road replenishes master-slave mode voltage, the current instantaneous value feedback control strategy of the required deficit power of load, its control block diagram and control principle waveform are respectively shown in Fig. 9,10.With converter 1,2 ..., n-1 input current feedback signal I
I1f, I
I2f..., I
I (n-1) fRespectively with reference current I
I1r, I
I2r..., I
I (n-1) rCompare, its error signal has obtained error current amplifying signal I behind proportional and integral controller
1e, I
2e..., I
(n-1) e, with the output voltage feedback signal U of converter
OfWith reference voltage U
rCompare, its error signal has obtained error voltage amplifying signal U behind proportional and integral controller
e, I
1c, I
2c..., I
(n-1) e, U
eRespectively with zigzag carrier wave u
cHand over and cut, obtained pwm signal u
Hf1, u
Hf2..., u
HfnAnd reverse signal u
Hf12, u
Hf22..., u
Hfn2u
Hf1Respectively with trailing edge two divided-frequency signal u
SyAnd reverse signal u
SyWith, behind drive circuit, obtain power switch S
12(S
13), S
11(S
14) drive signal; u
Hf2..., u
BfnRespectively with u
Hf1, u
Hf2..., u
Hfn-1Reverse signal with the back, more respectively with u
Sy, u
SyWith, behind drive circuit, obtain power switch S
22(S
23) and S
21(S
24), S
32(S
33) and S
31(S
34) ..., S
N2(S
N3) and S
N1(S
N4) drive signal.
Therefore, when input voltage or load variations, by regulating reference voltage U
rWith reference current I
I1r, I
I2r..., I
I (n-1) r, promptly regulated error voltage signal U
eWith error current signal I
1e, I
2e..., I
(n-1) eChange duty ratio D
1, D
2..., D
n, just can realize the stable of double-isolation boosting and step-down multi-input direct current convertor output voltage, input current (power output) and regulate.
For two-tube reverse excitation circuit shown in Figure 6, duty ratio (D
1, D
2..., D
n) be exactly the duty ratio of corresponding power switch, i.e. D
1=T
ON1/ T
s, D
2=T
ON2/ T
s..., D
n=T
ONn/ T
s(T
sBe the HF switch cycle), for the two-tube inverse-excitation type of paralleling and interleaving shown in Fig. 7,8, paralleling and interleaving single tube reverse excitation circuit, duty ratio (D
1, D
2..., D
n) be exactly the twice of corresponding power duty cycle of switching, i.e. D
1=T
ON1/ (T
s/ 2), D
2=T
ON2/ (T
s/ 2) ..., D
n=T
ONn/ (T
s/ 2).
Claims (2)
1. double-isolation boosting and step-down multi-input direct current convertor, it is characterized in that: this converter by the high frequency storage transformer of the single output of input more than with a plurality of mutual isolation, high-frequency inverter circuit and a shared output rectifier and filter of having input LC filter connect formation, each input of high frequency storage transformer and the corresponding one by one connection of the output of each high-frequency inverter circuit, the output of high frequency storage transformer and the input of output rectifier and filter link, described each have the high-frequency inverter circuit of input LC filter by input LC filter, high-frequency inverter cascade in regular turn constitutes, and described output rectifier and filter is by hf rectifier, the cascade in regular turn of output capacitance filter constitutes.
2. double-isolation boosting and step-down multi-input direct current convertor according to claim 1 is characterized in that: the circuit topology of described double-isolation boosting and step-down multi-input direct current convertor is two-tube inverse-excitation type, the two-tube inverse-excitation type of paralleling and interleaving, paralleling and interleaving single tube reverse excitation circuit.
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| CN108199603A (en) * | 2018-01-09 | 2018-06-22 | 青岛大学 | Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply |
| CN108199598A (en) * | 2018-01-09 | 2018-06-22 | 青岛大学 | Multiple coil time sharing power supply voltage-type single-stage multi input low frequency link inverter |
| CN111555349A (en) * | 2020-05-18 | 2020-08-18 | 盐城工学院 | Flyback converter applied to virtual series photovoltaic DPP system |
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