CN209948959U - Isolated Z-source direct-current converter with multiple windings supplying power simultaneously - Google Patents

Isolated Z-source direct-current converter with multiple windings supplying power simultaneously Download PDF

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CN209948959U
CN209948959U CN201920768086.0U CN201920768086U CN209948959U CN 209948959 U CN209948959 U CN 209948959U CN 201920768086 U CN201920768086 U CN 201920768086U CN 209948959 U CN209948959 U CN 209948959U
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diode
electrically connected
capacitor
frequency transformer
converter
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Inventor
李春杰
李洪美
王贵峰
夏正龙
闫俊荣
柴艳莉
李飞
刘战
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Jiangsu Normal University
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Jiangsu Normal University
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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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The utility model discloses an isolated form Z source direct current converter of many windings power supply simultaneously, including high frequency transformer, output rectifier circuit and a N parallel circuit, a N parallel circuit is parallelly connected each other, parallel circuit includes the power, Z source network and voltage type H bridge dc-to-ac converter, the parallelly connected Z source network of power and voltage type H bridge dc-to-ac converter, the input of the output electric connection voltage type H bridge dc-to-ac converter of Z source network, the primary winding of the output electric connection integrated form high frequency transformer of voltage type H bridge dc-to-ac converter, the input of the secondary winding electric connection output rectifier circuit of integrated form high frequency transformer. The utility model discloses a mode that Z source network, voltage type H bridge dc-to-ac converter, high frequency transformer and output rectifier circuit combined together has constituted isolated form voltage type Z source direct current converter. When multiple input sources supply power simultaneously, the converter can realize the functions of boosting and reducing voltage due to the addition of the Z source network, and has the characteristic of electrical isolation.

Description

Isolated Z-source direct-current converter with multiple windings supplying power simultaneously
Technical Field
The utility model relates to a converter technical field especially relates to an isolated form Z source direct current converter of many windings power supply simultaneously.
Background
The distributed new energy is used as an efficient energy supply system for comprehensive utilization of energy, and is rapidly developed in the national large policy environment of power grid reformation promotion and energy conservation and emission reduction. The single energy power supply system usually has the defects of unstable power supply, change along with climatic conditions and the like, and a multi-energy combined power supply system is required to be adopted for improving the stability of the power supply system and realizing the full utilization of energy. Compared with a single-input DC/DC converter, the multi-input DC/DC converter has the advantages of high efficiency, simple topological structure, capability of allowing a plurality of power supplies to work simultaneously, low cost, simplicity in control and the like, and is popular in micro-grid power supply systems.
Several configurations of multiple input converters are also currently available. Fig. 1 shows a multiple-input time-sharing Buck converter, and the circuit topology is a time-sharing Buck converter structure, i.e., only one input source can be operated at any time, and the other input source is idle. The two switch tubes of the circuit can not be conducted at the same time. Fig. 2 is a multiple input BOOST converter. The converter adopts a current type inverter, which has a boosting function, but has limited boosting capability and no voltage reduction capability, and the multi-input converter can simultaneously work in a time-sharing manner.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: to there being the unstable, problem along with the climatic condition change of power supply in current single energy power supply system, the utility model provides an isolated form Z source direct current converter of many windings power supply simultaneously.
The technical scheme is as follows: for realizing the purpose of the utility model, the utility model adopts the technical proposal that:
an isolated Z-source direct current converter with multiple windings supplying power simultaneously comprises a high-frequency transformer, an output rectifying circuit and N parallel circuits, wherein N is more than or equal to 2 and is an integer, the N parallel circuits are mutually connected in parallel, the output ends of the N parallel circuits are electrically connected with a primary winding of the integrated high-frequency transformer, and a secondary winding of the integrated high-frequency transformer is electrically connected with the input end of the output rectifying circuit;
the parallel circuit comprises a power supply (U)i) Z source network and voltage type H bridge inverter, said power supply (U)i) A Z source network and a voltage type H bridge inverter are connected in parallel, the output end of the Z source network is electrically connected with the input end of the voltage type H bridge inverter, the output end of the voltage type H bridge inverter is electrically connected with the primary winding of the integrated high-frequency transformer, and the power supply (U)i) And power is supplied to the Z source network, the voltage type H bridge inverter, the high-frequency transformer and the output rectifying circuit.
Further, the Z-source network comprises a first inductance (L)n1) A second inductor (L)n2) A fifth diode (D)n5) A first capacitor (C)n1) And a second capacitance (C)n2) Said first inductance (L)n1) Is electrically connected with a power supply (U)i) The anode and the output end of the first capacitor are electrically connected with a second capacitor (C)n2) Said second capacitor (C)n2) And power supply (U)i) The negative electrodes of the voltage-type H-bridge inverters are electrically connected with the input end of the voltage-type H-bridge inverter;
the second capacitance (C)n2) Parallel fifth diode (D)n5) And a second inductance (L)n2) Said fifth diode (D)n5) Is electrically connected with the second capacitor (C)n2) And a first inductance (L)n1) The output end and the cathode are electrically connected with the second inductor (L)n2) And a first capacitor (C)n1) Input terminal ofThe second inductor (L)n2) The output terminal of the first capacitor is electrically connected with the second capacitor (C)n2) And the input of a voltage-type H-bridge inverter, said first capacitor (C)n1) The output end of the power supply is electrically connected with a power supply (U)i) And the input terminal of the voltage type H-bridge inverter.
Further, the voltage type H-bridge inverter includes a first diode (D)n1) A second diode (D)n2) A third diode (D)n3) A fourth diode (D)n4) A first switch (S)n1) A second switch (S)n2) And a third switch (S)n3) And a fourth switch (S)n4) The first diode (D)n1) Parallel first switch (S)n1) Said second diode (D)n2) Parallel second switch (S)n2) Said third diode (D)n3) Parallel third switch (S)n3) Said fourth diode (D)n4) Parallel fourth switch (S)n4)；
The first diode (D)n1) The cathode is electrically connected with the second capacitor (C)n2) Output terminal of (1), second inductance (L)n2) And a second diode (D)n2) The first diode (D)n1) The anode of the first diode is electrically connected with the primary winding of the integrated high-frequency transformer and the third diode (D)n3) The third diode (D)n3) Is electrically connected with the first capacitor (C)n1) Output terminal, power supply (U)i) Negative electrode of (D), fourth diode (D)n4) The second diode (D)n2) The anode of the first diode is electrically connected with the primary winding of the integrated high-frequency transformer and the fourth diode (D)n4) The cathode of (1).
Further, the integrated high-frequency transformer comprises a secondary winding, a magnetic core and N primary windings, wherein N is more than or equal to 2 and is an integer, and the N primary windings and the N secondary windings are wound on the same magnetic core.
Further, the number of primary windings of the integrated high-frequency transformer is the same as that of the parallel circuits.
Further, the output rectifying circuit comprisesSixth diode (D)6) A seventh diode (D)7) An eighth diode (D)8) A ninth diode (D)9) Filter capacitor (C)f) And resistance (R)L) The resistance (R)L) Parallel filter capacitor (C)f) And a sixth diode (D)6) And a seventh diode (D)7) An eighth diode (D)8) And a ninth diode (D)9) Said sixth diode (D)6) Is electrically connected with the eighth diode (D)8) The cathode and the anode of the first diode are electrically connected with the seventh diode (D)7) And a secondary winding of the integrated high-frequency transformer, the seventh diode (D)7) Is electrically connected with the ninth diode (D)9) The ninth diode (D)9) Is electrically connected with the eighth diode (D)8) And a secondary winding of the integrated high-frequency transformer.
Has the advantages that: compared with the prior art, the technical scheme of the utility model following beneficial technological effect has:
(1) the utility model discloses utilize the unique advantage of Z source network, adopt the mode that Z source network, voltage type H bridge dc-to-ac converter, high frequency transformer and output rectifier circuit combine together to constitute isolated voltage type Z source direct current converter, when multichannel input source need carry out the power supply simultaneously, because the joining of Z source network, can make the converter realize step-up and step-down function, have the characteristics of electrical isolation;
(2) the utility model discloses a high frequency transformer magnetic flux superposition method carries out voltage superposition with a plurality of single input direct current converters at the output, can realize the function that the multichannel input source supplies power simultaneously;
(3) the voltage type H-bridge converter of the utility model can realize soft switching, and reduce the switching loss;
(4) the utility model discloses a converter has become direct signal into an effective state to when having avoided direct damage switch tube, still improved the reliability of converter.
Drawings
FIG. 1 is a circuit diagram of a multiple input time sharing Buck converter;
fig. 2 is a circuit diagram of a multiple input Boost converter;
fig. 3 is a circuit diagram of an isolated Z-source dc converter with multiple windings supplying power simultaneously according to the present invention;
FIG. 4(a) is an equivalent circuit diagram for the through zero vector state;
FIG. 4(b) is an equivalent circuit diagram in the active state;
fig. 5 is a control signal diagram of an isolated Z-source dc converter with multiple windings supplying power simultaneously.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Accordingly, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1
Referring to fig. 3, this example provides an isolated Z-source dc converter with multiple windings supplying power simultaneously, which includes a high-frequency transformer, an output rectification circuit, and N parallel circuits, where N is greater than or equal to 2 and N is an integer, and in this embodiment, the size of N is selected to be 3.
In the present embodiment, specifically, three parallel circuits are connected in parallel with each other, while each parallel circuit includes the power source UiZ source network and voltage type H bridge inverter at eachIn a parallel circuit, a power supply UiThe Z source network and the voltage type H bridge inverter are connected in parallel, the output end of the voltage type H bridge inverter is electrically connected with the primary winding of the integrated high-frequency transformer, the secondary winding of the integrated high-frequency transformer is electrically connected with the input end of the output rectifying circuit, and therefore the power supply UiFor supplying power to the Z source network, the voltage type H bridge inverter, the high frequency transformer and the output rectifying circuit, i.e. the converter is operated integrally by the power supply UiPower is supplied to maintain basic operation.
The Z source network in the parallel circuit comprises a first inductor Ln1A second inductor Ln2A fifth diode Dn5A first capacitor Cn1And a second capacitor Cn2. Wherein the power supply UiThe positive electrode is electrically connected with the first inductor Ln1Input terminal of, power supply UiThe negative electrode of the first capacitor is electrically connected with the first capacitor Cn1And the input end of the voltage type H-bridge inverter, and a first inductor Ln1Through a second capacitor Cn2And is also electrically connected with the input end of the voltage type H-bridge inverter. In particular, the first inductance Ln1The output end of the first capacitor is electrically connected with the second capacitor Cn2Of the second capacitor Cn2The output end of the voltage-type H-bridge inverter is electrically connected with the input end of the voltage-type H-bridge inverter. While a second capacitor Cn2Connected in parallel with a fifth diode Dn5And a second inductance Ln2Wherein the fifth diode Dn5The anode is electrically connected with the second capacitor Cn2Of a fifth diode Dn5The cathode is electrically connected with the second inductor Ln2To the input terminal of (1).
In the present embodiment, the fifth diode Dn5And a second inductance Ln2Through the first capacitor Cn1Electric connection power UiOf the fifth diode D, in particularn5The anode is electrically connected with the second capacitor Cn2And the first inductor Ln1An output terminal of the fifth diode Dn5The cathode is electrically connected with the second inductor Ln2And a first capacitor Cn1And a first capacitor Cn1The output end of the power supply is electrically connected with a power supply UiAnd the input of the H-bridge inverter.
The voltage-type H-bridge inverter in parallel circuit comprises a first diode Dn1A second diode Dn2A third diode Dn3A fourth diode Dn4A first switch Sn1A second switch Sn2And a third switch Sn3And a fourth switch Sn4. Wherein the first diode Dn1Parallel first switch Sn1A second diode Dn2Parallel second switch Sn2A third diode Dn3Parallel third switch Sn3Fourth diode Dn4Parallel fourth switch Sn4。
In particular, the first diode Dn1The cathode is electrically connected with the second capacitor Cn2Output terminal of, second inductance Ln2Output terminal of the first diode Dn2And a first switch Sn1The first diode Dn1The anode is electrically connected with the first switch Sn1Primary winding of the integrated high-frequency transformer and a third diode Dn3The cathode of (1).
Third diode Dn3The anode is electrically connected with the first capacitor Cn1Output terminal and power supply UiNegative pole of (2), third switch Sn3Output terminal of, fourth diode Dn4While the third diode Dn3The cathode is electrically connected with the third switch Sn3To the input terminal of (1).
Fourth diode Dn4The cathode is electrically connected with the fourth switch Sn4Input end of the first diode, primary winding of the integrated high-frequency transformer and the second diode Dn2While the fourth diode Dn4The anode is electrically connected with the fourth switch Sn4To the output terminal of (a).
Second diode Dn2The cathode is electrically connected with the second switch Sn2The input end and the anode are electrically connected with a second switch Sn2To the output terminal of (a).
The integrated high-frequency transformer comprises N primary windings, a secondary winding and a magnetic core, wherein N is more than or equal to 2 and is an integer, and the number N of the primary windings is the same as that of the parallel circuits, in the embodiment, the number of the parallel circuits is 3, so that the number of the primary windings is also 3. That is, three primary windings and one secondary winding are wound on the same core.
The output rectifying circuit comprises a sixth diode D6The seventh diode D7An eighth diode D8A ninth diode D9Filter capacitor CfAnd a resistance RLWherein the sixth diode D6A seventh diode D connected in series7Eighth diode D8A ninth diode D connected in series9And a sixth diode D6And a seventh diode D7The series circuit formed by connecting the eighth diode D in parallel8And a ninth diode D9The filter capacitor C is connected in parallel with the series circuitfAnd a resistance RLThat is, the filter capacitor CfParallel resistor RL。
In the present embodiment, specifically, the sixth diode D6The cathode of the diode is electrically connected with the eighth diode D8Cathode and filter capacitor CfInput terminal of (1), resistor RLInput terminal of, a sixth diode D6Anode of the first diode is electrically connected with the seventh diode D7And a secondary winding of the integrated high-frequency transformer.
Seventh diode D7Anode of the first diode is electrically connected with the ninth diode D9Anode and filter capacitor CfOutput terminal of (1), resistor RLThe ninth diode D9The cathode of the diode is electrically connected with the eighth diode D8And a secondary winding of the integrated high-frequency transformer.
Fig. 4 is an equivalent circuit diagram of an operating mode of the isolated Z-source dc converter with multiple windings supplying power simultaneously according to the embodiment. The working states of the isolated Z-source dc converter in this embodiment are divided into two types, namely a direct zero vector state and an effective state. Fig. 4(a) is an equivalent circuit diagram in the through zero vector state, and in the through zero vector state, the diode in the Z source network is in an off state. Fig. 4(b) is an equivalent circuit diagram in an active state, that is, energy is transmitted to the load side in the circuit, and the diode in the Z source network is in a conducting state.
Fig. 5 is a control signal diagram of the isolated Z-source dc converter with multiple windings supplying power simultaneously according to the embodiment. In three parallel circuits, a first diode D is connected to the voltage-type H-bridge inverter in each parallel circuitn1And a third diode Dn3The control signals in the series circuit are identical, and a second diode D is arranged on the voltage type H-bridge invertern2And a fourth diode Dn4In the formed series circuit, pulse waves can be emitted by changing a phase shift angle theta in the circuit, so that the output voltage can be controlled by changing the phase shift angle.
The above-mentioned embodiment is to the technical solution and effective fruit of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, all of which are in any modification, supplement, equivalent replacement, etc. made within the principle scope of the present invention, should be included in the protection scope of the present invention.

Claims (6)

1. An isolated Z-source direct current converter with multiple windings supplying power simultaneously is characterized by comprising a high-frequency transformer, an output rectifying circuit and N parallel circuits, wherein N is more than or equal to 2 and is an integer, the N parallel circuits are mutually connected in parallel, the output ends of the N parallel circuits are electrically connected with a primary winding of the integrated high-frequency transformer, and a secondary winding of the integrated high-frequency transformer is electrically connected with the input end of the output rectifying circuit;
the parallel circuit comprises a power supply (U)i) Z source network and voltage type H bridge inverter, said power supply (U)i) A Z source network and a voltage type H bridge inverter are connected in parallel, the output end of the Z source network is electrically connected with the input end of the voltage type H bridge inverter, the output end of the voltage type H bridge inverter is electrically connected with the primary winding of the integrated high-frequency transformer, and the power supply (U)i) Is a Z source network, a voltage type H bridge inverter, a high frequency transformer and an output rectifierThe circuit supplies power.
2. Isolated form Z-source DC converter with simultaneous supply of multiple windings according to claim 1, characterized in that the Z-source network comprises a first inductance (L)n1) A second inductor (L)n2) A fifth diode (D)n5) A first capacitor (C)n1) And a second capacitance (C)n2) Said first inductance (L)n1) Is electrically connected with a power supply (U)i) The anode and the output end of the first capacitor are electrically connected with a second capacitor (C)n2) Said second capacitor (C)n2) And power supply (U)i) The negative electrodes of the voltage-type H-bridge inverters are electrically connected with the input end of the voltage-type H-bridge inverter;
the second capacitance (C)n2) Parallel fifth diode (D)n5) And a second inductance (L)n2) Said fifth diode (D)n5) Is electrically connected with the second capacitor (C)n2) And a first inductance (L)n1) The output end and the cathode are electrically connected with the second inductor (L)n2) And a first capacitor (C)n1) Said second inductance (L)n2) The output terminal of the first capacitor is electrically connected with the second capacitor (C)n2) And the input of a voltage-type H-bridge inverter, said first capacitor (C)n1) The output end of the power supply is electrically connected with a power supply (U)i) And the input terminal of the voltage type H-bridge inverter.
3. A multi-winding simultaneous supply isolated Z-source dc converter according to claim 2, characterized in that said voltage-type H-bridge inverter comprises a first diode (D)n1) A second diode (D)n2) A third diode (D)n3) A fourth diode (D)n4) A first switch (S)n1) A second switch (S)n2) And a third switch (S)n3) And a fourth switch (S)n4) The first diode (D)n1) Parallel first switch (S)n1) Said second diode (D)n2) Parallel second switch (S)n2) Said third diode (D)n3) Parallel third switch (S)n3) What is, what isThe fourth diode (D)n4) Parallel fourth switch (S)n4)；
The first diode (D)n1) The cathode is electrically connected with the second capacitor (C)n2) Output terminal of (1), second inductance (L)n2) And a second diode (D)n2) The first diode (D)n1) The anode of the first diode is electrically connected with the primary winding of the integrated high-frequency transformer and the third diode (D)n3) The third diode (D)n3) Is electrically connected with the first capacitor (C)n1) Output terminal, power supply (U)i) Negative electrode of (D), fourth diode (D)n4) The second diode (D)n2) The anode of the first diode is electrically connected with the primary winding of the integrated high-frequency transformer and the fourth diode (D)n4) The cathode of (1).
4. The isolated Z-source DC converter with multiple windings for supplying power simultaneously as claimed in claim 1, 2 or 3, wherein said integrated high frequency transformer includes a secondary winding, a magnetic core and N primary windings, where N is greater than or equal to 2 and N is an integer, and said N primary windings and said secondary windings are wound on the same magnetic core.
5. The isolated Z-source DC converter with multiple windings supplying power simultaneously as claimed in claim 4, wherein the number of primary windings of the integrated high frequency transformer is the same as the number of parallel circuits.
6. A multi-winding simultaneous supply isolated Z-source DC converter according to claim 4, characterized in that said output rectifying circuit comprises a sixth diode (D)6) A seventh diode (D)7) An eighth diode (D)8) A ninth diode (D)9) Filter capacitor (C)f) And resistance (R)L) The resistance (R)L) Parallel filter capacitor (C)f) And a sixth diode (D)6) And a seventh diode (D)7) An eighth diode (D)8) And a ninth diode (D)9) Said sixth diode (D)6) Is electrically connected with the eighth diode (D)8) The cathode and the anode of the first diode are electrically connected with the seventh diode (D)7) And a secondary winding of the integrated high-frequency transformer, the seventh diode (D)7) Is electrically connected with the ninth diode (D)9) The ninth diode (D)9) Is electrically connected with the eighth diode (D)8) And a secondary winding of the integrated high-frequency transformer.
CN201920768086.0U 2019-05-27 2019-05-27 Isolated Z-source direct-current converter with multiple windings supplying power simultaneously Expired - Fee Related CN209948959U (en)

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