CN206564540U - A kind of quasi- Z source converters of type switching capacity altogether - Google Patents
A kind of quasi- Z source converters of type switching capacity altogether Download PDFInfo
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- CN206564540U CN206564540U CN201720047506.7U CN201720047506U CN206564540U CN 206564540 U CN206564540 U CN 206564540U CN 201720047506 U CN201720047506 U CN 201720047506U CN 206564540 U CN206564540 U CN 206564540U
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Abstract
The utility model provides a kind of quasi- Z source converters of type switching capacity altogether, mainly include input dc power potential source, by the first inductance, the first electric capacity, first diode, the quasi- Z source networks that second inductance and the second electric capacity are constituted, by the 3rd electric capacity, the 3rd diode, the switched capacitor network that 4th electric capacity and the 4th diode are constituted, switching tube, the second diode, the 5th electric capacity and load resistance.Whole circuit structure is simple, a switching tube is only used, source current is continuous, input and output common ground, the single-stage buck characteristic and switching capacity for combining quasi- Z source impedance networks charge the characteristic of discharged in series parallel, higher output voltage gain is made it have, and inrush current is not present for circuit and switching tube opens the dash current of moment.
Description
Technical field
The utility model is related to converters technical field, and in particular to a kind of quasi- Z sources of type switching capacity altogether
Converter.
Background technology
In recent years, due to a large amount of exploitation and consumption of traditional fossil energy, in order to realize sustainable development, the world
Each state is all in the new regenerative resource of Devoting Major Efforts To Developing, solar energy, wind energy, fuel cell etc..Wherein photovoltaic is sent out
Electricity has become implements one of most commonly used mode generated electricity using solar energy now.But it is due to photovoltaic array battery
Output voltage grade it is relatively low, it is impossible to meet some existing electrical equipments and grid-connected requirement, therefore photovoltaic array battery is defeated
Going out after voltage has to pass through the DC/DC converter boosts of high-gain to use.The most frequently used traditional Boost, by
In the operative duty cycles of switching tube when requiring that output voltage gain is very high, can be made close to 1, so that excessive switch can be caused
Loss, reduces the whole efficiency of system.And the Z sources DC-DC converter proposed in recent years, although it is real using Z source impedance networks
Showed boosting, the space but its voltage gain still has greatly improved, in addition it also exist input and output not altogether, switching voltage
The problems such as stress is high.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and there is provided a kind of quasi- Z of type switching capacity altogether
Source converter, concrete technical scheme is as follows.
A kind of quasi- Z source converters of type switching capacity altogether, it includes input dc power potential source, by the first inductance, the first electricity
Hold, the first diode, the second inductance, the quasi- Z source impedance networks that the second electric capacity is constituted, by the 3rd electric capacity, the 3rd diode, the 4th
Electric capacity, the switched capacitor network that the 4th diode is constituted, switching tube, the second diode, the 5th electric capacity and load resistance.
The specific connected mode of the utility model circuit is：One end of the input dc power potential source and the one of the first inductance
End connection；The other end of first inductance is connected with the negative pole of the first electric capacity and the anode of the first diode respectively；Described
The negative electrode of one diode is connected with the positive pole of the second electric capacity and one end of the second inductance respectively；The other end of second inductance point
Negative pole not with the drain electrode of the positive pole, switching tube of the first electric capacity, the anode of the second diode and the 3rd electric capacity is connected；Described second
The negative electrode of diode is connected with the anode, the negative pole of the 4th electric capacity and the positive pole of the 5th electric capacity of the 3rd diode respectively；Described
The negative electrode of three diodes is connected with the positive pole of the 3rd electric capacity and the anode of the 4th diode respectively；The negative electrode of 4th diode
It is connected respectively with the positive pole of the 4th electric capacity and one end of load resistance；The other end of the load resistance respectively with the 5th electric capacity
Negative pole, the source electrode of switching tube, the negative pole connection of the negative pole of the second electric capacity and input dc power potential source.
The converter stable state export when voltage gain G be：
Wherein VoRepresent the output voltage of converter load-side, ViFor input dc power potential source, D is
Dutycycle.
The utility model has the following advantages that compared with prior art：It is simple in construction without extra power switch pipe, control
System is convenient；And compared to traditional switching capacity Boost (its output voltage gain is G=2/ (1-D)) and the boosting of Z sources
Converter (its corresponding output voltage gain is G=1/ (1-2D)), in the case of identical input voltage and dutycycle, tool
It is G=2/ (1-2D) to have higher output voltage gain.And source current is continuous, between input and output altogether, switch stress
Relatively low, in the absence of circuit start dash current etc., therefore the utility model circuit has and is widely applied very much prospect.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of quasi- Z source converters of the switching capacity of type altogether in embodiment.
Fig. 2 a are equivalent circuit diagram of the circuit shown in Fig. 1 in operation mode 1 (switching tube conducting).
Fig. 2 b are equivalent circuit diagram of the circuit shown in Fig. 1 in operation mode 2 (switching tube shut-off).
Fig. 3 a are that converter described in the utility model example is converted with switching capacity Boost and traditional quasi- Z sources
The output voltage gain contrast curve of device.
Fig. 3 b are with ViCircuit correlated variables in the utility model example provided exemplified by=15V, dutycycle D=0.3
Simulation result figure.
Embodiment
With reference to embodiments and accompanying drawing is described in further detail explanation to the utility model, it is but of the present utility model
Embodiment not limited to this.If being art technology it is noted that having the process or parameter of not special detailed description below
Personnel can refer to prior art understand or realize.
The Basic Topological of this example and each main element are as shown in Figure 1.In order to easy to verify, it is being not particularly illustrated
In the case of device in circuit structure be accordingly to be regarded as ideal component.A kind of quasi- Z source converters of type switching capacity altogether, it includes defeated
Enter direct voltage source Vi, by the first inductance L1, the first electric capacity C1, the first diode D1, the second inductance L2, the second electric capacity C2Constitute
Quasi- Z source impedance networks, by the 3rd electric capacity C3, the 3rd diode D3, the 4th electric capacity C4, the 4th diode D4The switching capacity of composition
Network, switching tube S, the second diode D2, the 5th electric capacity C5With load resistance RL；
Configuration switch pipe S drive signal is V in this exampleGS, the first inductance L1Electric current is iL1, the second inductance L2Electric current is
For iL2, the first electric capacity C1Voltage is VC1, the second electric capacity C2Voltage is VC2, the 3rd electric capacity C3Voltage is VC3, the 4th electric capacity C4Voltage
For VC4, the 5th electric capacity C5Voltage be VC5.Straight-through dutycycle when configuration switch pipe is turned on is D, and the configuration switch cycle is Ts。
As shown in Figure 2 a and 2 b, solid line represents the part for having electric current to flow through in converter in figure, and dotted line represents converter
In there is no the part that electric current flows through, this altogether the quasi- Z source converters of type switching capacity in a switch periods (0, Ts) interior not same order
2 operation modes of section, are described as follows respectively：
Operation mode 1 (0<t<DTs)：As shown in Figure 2 a, switching tube S is open-minded, the first diode D1, the second diode D2With
4th diode D4Reversely cut-off, the 3rd diode D3Forward conduction.Then now input dc power potential source ViWith the first electric capacity C1It is logical
Switching tube S be crossed together to the first inductance L1Charging, the second electric capacity C2The second inductance L is given by switching tube S2Charging, the 5th electric capacity C5
Pass through the 3rd diode D3The 3rd electric capacity C is given with switching tube S3Charging, while the 5th electric capacity C5With the 4th electric capacity C4Series connection together to
Load resistance RLPower supply.
Under this operation mode, associated electrical parameters relational expression is：
VL1_on=Vi+VC1 (1)
VL2_on=VC2, VC5=VC3 (2)
Vo=VC4+VC5 (3)
Wherein, VL1-on,VL2-onThe first inductance L during switching tube S conductings is represented respectively1, the second inductance L2The voltage at two ends,
VoRepresent the output voltage of converter load-side.
(the DT of operation mode 2s<t<Ts)：As shown in Figure 2 b, switching tube S is turned off, then the first diode D1, the second diode D2
With the 4th diode D4Conducting, the 3rd diode D3Shut-off.Then now input dc power potential source ViWith the first inductance L1Pass through first
Diode D1To the second electric capacity C2Charging, the second inductance L2Pass through the first diode D1To the first electric capacity C1Charging, input dc power
Potential source ViWith the first inductance L1, the second inductance L2Connect to the 5th electric capacity C5Charging, the 3rd electric capacity C3To the 4th electric capacity C4Charging.Together
When, input dc power potential source ViWith the first inductance L1, the second inductance L2With the 3rd electric capacity C3Series connection is together to load resistance RLPower supply.
Under this operation mode, associated electrical parameters relational expression is：
VL1_off=Vi-VC2 (4)
VL2_off=-VC1 (5)
VC5=Vi-VL1_off-VL2_off (6)
VC3=VC4(7)
Vo=VC3-VL1_off-VL2_off+Vi (8)
Wherein, VL1-off,VL2-offThe first inductance L during switching tube S shut-offs is represented respectively1, the second inductance L2The voltage at two ends.
Analyzed more than, to the first inductance L1, the second inductance L2Exist respectively with voltage-second balance principle, i.e. inductive drop
Average value in one switch periods is zero, and simultaneous formula (1), (2), (4), (5) can be obtained
D(Vi+VC1)+(1-D)(Vi-VC2)=0 (9)
DVC2+(1-D)(-VC1)=0 (10)
The expression formula of capacitance voltage and output voltage point when then simultaneous formula (6), (7), (8), (9) and (10) can try to achieve stable state
It is not：
Voltage gain G when then a kind of quasi- Z source converters stable state of switching capacity of type altogether described in the utility model is exported
For：
It is accurate for the output voltage gain curve and switching capacity Boost and tradition of this example circuit as shown in Figure 3 a
The voltage gain curve ratio of Z source converters is relatively schemed.As seen from the figure, the utility model circuit is no more than 0.5 situation in dutycycle D
Under, output voltage gain G can just reach very big, hence it is evident that higher than the voltage gain of other two kinds of converters, and the utility model
The dutycycle D of circuit is not over 0.5.
Shown in Fig. 3 b, with ViExemplified by=15V, dutycycle D=0.3, correlated variables in the utility model circuit is given
Simulation result.During D=0.3, corresponding output voltage gain G=5, capacitance voltage VC1=11.25V, VC2=26.25V, VC3=
VC4=VC5=37.5V, output voltage Vo=75V.In addition, giving inductive current (i in Fig. 3 bL1、iL2) waveform and open
Close pipe S drive signal VGSWaveform.
In summary, the utility model proposes one kind quasi- Z source converters of type switching capacity altogether, without extra power
Switching tube, it is simple in construction, it is easy to control.Compared to switching capacity Boost and traditional quasi- Z source converters, identical
Input voltage and dutycycle in the case of, with higher output voltage gain, and source current is continuous, input and output
Between altogether, circuit start moment be not present inrush current, therefore the utility model circuit have be widely applied very much before
Scape.
Above-described embodiment is the utility model preferably embodiment, but embodiment of the present utility model is not by described
The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, are included within protection domain of the present utility model.
Claims (5)
1. a kind of quasi- Z source converters of type switching capacity altogether, it is characterised in that including input dc power potential source（V i）, by the first electricity
Sense（L 1）, the first electric capacity（C 1）, the first diode（D 1）, the second inductance（L 2）, the second electric capacity（C 2）The quasi- Z source impedances net constituted
Network, by the 3rd electric capacity（C 3）, the 3rd diode（D 3）, the 4th electric capacity（C4）, the 4th diode（D4）The switching capacity net of composition
Network, switching tube（S）, the second diode（D 2）, the 5th electric capacity（C 5）And load resistance（R L ）；The input dc power potential source（V i）
One end and the first inductance（L1）One end connection；First inductance（L1）The other end respectively with the first electric capacity（C1）It is negative
Pole and the first diode（D1）Anode connection；First diode（D1）Negative electrode respectively with the second electric capacity（C2）Positive pole
With the second inductance（L2）One end connection；Second inductance（L2）The other end respectively with the first electric capacity（C1）Positive pole, switch
Pipe（S）Drain electrode, the second diode（D2）Anode and the 3rd electric capacity（C3）Negative pole connection；Second diode（D2）'s
Negative electrode respectively with the 3rd diode（D3）Anode, the 4th electric capacity（C4）Negative pole and the 5th electric capacity（C5）Positive pole connection；It is described
3rd diode（D3）Negative electrode respectively with the 3rd electric capacity（C3）Positive pole and the 4th diode（D4）Anode connection；Described
Four diodes（D4）Negative electrode respectively with the 4th electric capacity（C4）Positive pole and load resistance（R L ）One end connection；The load electricity
Resistance（R L ）The other end respectively with the 5th electric capacity（C5）Negative pole, switching tube（S）Source electrode, the second electric capacity（C2）Negative pole and defeated
Enter direct voltage source（Vi）Negative pole connection.
2. a kind of quasi- Z source converters of type switching capacity altogether according to claim 1, it is characterised in that when switching tube is opened
It is logical, the first diode, the second diode and the cut-off of the 4th diode reverse, the conducting of the 3rd diode forward.
3. then now input dc power potential source and the first electric capacity give the first induction charging together by switching tube, the second electric capacity passes through
Switching tube gives the second induction charging, and the 5th electric capacity is charged by the 3rd diode and switching tube to the 3rd electric capacity, while the 5th electricity
Hold and the series connection of the 4th electric capacity is powered to load resistance together；When switching tube shut-off, then the first diode, the second diode and the 4th
Diode current flow, the shut-off of the 3rd diode.
4. then now input dc power potential source and the first inductance are charged by the first diode to the second electric capacity, the second inductance passes through
First diode charges to the first electric capacity, and input dc power potential source is connected with the first inductance, the second inductance to charge to the 5th electric capacity,
3rd electric capacity charges to the 4th electric capacity.
5. simultaneously, input dc power potential source is powered together with the series connection of the first inductance, the second inductance and the 3rd electric capacity to load resistance.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787692A (en) * | 2017-01-16 | 2017-05-31 | 华南理工大学 | A kind of quasi- Z source converters of type switching capacity altogether |
| CN108429451A (en) * | 2018-03-13 | 2018-08-21 | 东南大学 | A kind of photovoltaic system cascade connection type is booted DC-DC converter more |
-
2017
- 2017-01-16 CN CN201720047506.7U patent/CN206564540U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787692A (en) * | 2017-01-16 | 2017-05-31 | 华南理工大学 | A kind of quasi- Z source converters of type switching capacity altogether |
| CN108429451A (en) * | 2018-03-13 | 2018-08-21 | 东南大学 | A kind of photovoltaic system cascade connection type is booted DC-DC converter more |
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Effective date of registration: 20190815 Address after: 523320 Xianglong Road, Huangzhou, New District, Shilong Town, Dongguan City, Guangdong Province Patentee after: Fuhua Electronic Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: South China University of Technology |