CN111800004A - Expandable non-isolated single-tube high step-up ratio direct current converter - Google Patents
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- CN111800004A CN111800004A CN202010671080.9A CN202010671080A CN111800004A CN 111800004 A CN111800004 A CN 111800004A CN 202010671080 A CN202010671080 A CN 202010671080A CN 111800004 A CN111800004 A CN 111800004A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention discloses an extensible non-isolated single-tube high step-up ratio direct current converter. When the switch tube is switched on, the three inductors are charged, wherein the first inductor and the second inductor are charged in parallel, and the third inductor is charged by the reverse series connection of the two capacitors. After the switch tube is turned off, the three inductors are discharged simultaneously, wherein the first inductor and the second inductor are connected in series to discharge, and the third inductor is separately discharged to the capacitor. Through the charging and discharging of the three inductors, the basic structure of the invention can achieve a Boost ratio higher than the square of the Boost ratio of the Boost direct-current converter. In addition, by adding the expansion module consisting of one inductor and three diodes, the effect of charging in parallel and discharging in series of the three inductors can be realized, so that the boosting ratio is further improved. By analogy, to achieve the required higher boost ratio, a plurality of the expansion modules may be added.
Description
Technical Field
The invention belongs to the technical field of power electronics, is mainly applied to a distributed photovoltaic power generation system, and relates to an extensible non-isolated single-tube high step-up ratio direct-current converter.
Background
With the worldwide shortage of energy and the increasing severity of environmental damage, the distributed photovoltaic power generation has drawn great attention of the whole society with the characteristics of abundant resources, cleanness, environmental protection and the like. The output voltage of the photovoltaic module is generally low, usually between 20V and 50V, and the voltage of the photovoltaic module needs to be raised by a direct current converter before being connected to an inverter load or a direct current load. In a typical distributed power generation system, the dc bus voltage is usually over 380V, which is much higher than the output voltage of the photovoltaic module, so that the dc converter is required to have a high step-up ratio. As early as 2009, quadratic DC converters (j.leyva-Ramos, m.g.ortiz-Lopez, l.h.diaz-salvierna and j.a.morales-salvana, "Switching regulator using a square converter Boost ratio," in IET Power Electronics, vol.2, No.5, pp.605-613, sept.2009.) were proposed by related scholars. However, this converter cannot achieve further improvement of the step-up ratio, and cannot achieve further expansion of the structure. Therefore, when the output voltage of the photovoltaic module has a certain drop under the influence of conditions such as illumination and temperature, the converter may not satisfy the required voltage boosting ratio.
Disclosure of Invention
Aiming at the problem that the voltage of a photovoltaic module needs to be raised to a higher direct current bus voltage in a distributed photovoltaic power generation system, the invention provides an extensible non-isolated single-tube high-step-up ratio direct current converter, which can further improve the step-up ratio of the non-isolated direct current converter, wherein the converter only comprises a switching tube, the step-up ratio of a basic structure is larger than the square of the step-up ratio of the traditional Boost direct current converter, the requirement of higher step-up ratio can be met, and in addition, the step-up ratio can be further effectively improved by adding one or more extension modules;
to achieve the purpose, the invention provides a scalable non-isolated single-tube high step-up ratio direct current converter, which comprises a basic structure and an expansion module, wherein the basic structure comprises an input source, a switch tube, three inductors, six diodes, an intermediate capacitor, an output capacitor and a load,
the input source VinAnd the emitting electrode of the switching tube Q and the output capacitor CoNegative electrode and load RoAre simultaneously connected, and an input source VinThe positive electrode of the first inductor is a node a and is simultaneously connected to the first inductor L1And a first diode D10And a second diode D2And a second inductance L2And a first diode D10Respectively with the first inductor L1And a second inductance L2Is connected to one terminal of, and a second diode D2Respectively with the first inductor L1And a second inductance L2Is connected to the other end of the first diode D2The anode of (a) is also connected with the node a; first inductance L1And a second inductance L2A cross-over diode D is connected in series between12Across diode D12Are respectively connected to the first diode D10And a second diode D2A cathode of (a); first diode D10Anode and second inductor L2Between adjacent to the first diode D10One side of the cathode is a node c near the second inductor L2One side of is node b2(ii) a Node c is connected to output diode DoAnd a summing diode DtAnode of (2), output diode DoThe cathode is divided into two paths, one path is connected to the intermediate capacitor CpNegative electrode of (2), intermediate capacitor CpIs connected to the intermediate diode DpThen connected to the output capacitor CoPositive electrode and load RoAnd the other path is connected to the intermediate inductor LpRear and middle diodes DpAre connected to the anode of a diode DtCathode and intermediate diode DpThe anode of the switching tube Q is simultaneously connected with the collector of the switching tube Q;
an extension module is added on the foundation structure, and the extension module consists of an inductor Ln，n>2 and three diodes are respectively DnDiode D(n-1)nAnd a diode D(n-1)0Composition of, the diode DnIs connected to a node a in the base structure, while the cathode is simultaneously connected to the inductorLnAnd a diode D(n-1)nIs connected to the cathode of a diode D(n-1)nAnd a diode D(n-1)0Reverse series, series point b(n-1)Is a diode D(n-1)nWhen n is 3, the series point is the node b in the basic structure2Diode D(n-1)0The cathode and the inductor LnIs connected to another end of the diode D(n-1)0One side of the cathode is a node c, which is also a node c in the basic structure, close to the inductor LnOne side of is node bn。
As a further improvement of the present invention, in the basic structure, when the switching tube Q is turned on, the three inductors are charged simultaneously, wherein the first inductor L1And a second inductance L2Charged in parallel, and the intermediate inductance LpThen by the intermediate capacitor CpAnd an output capacitor CoTwo capacitors are reversely connected in series to charge the capacitor, and after the switching tube Q is turned off, the first inductor L1A second inductor L2And an intermediate inductance LpThe three inductors are discharged simultaneously, wherein the first inductor L1And a second inductance L2Discharge in series, and intermediate inductance LpThen discharge to the intermediate capacitor C alonepThe Boost ratio of the basic structure is larger than the square of the Boost ratio of the traditional Boost direct current converter.
As a further improvement of the invention, one or more expansion modules are added on the basic structure according to the requirement, and the inductance L in the added expansion modulesnAnd a first inductance L in the base structure1And a second inductance L2And an operation mode that a plurality of inductors are charged in parallel and discharged in series is further formed, so that the boosting ratio of the direct current converter is further improved.
The invention discloses an extensible non-isolated single-tube high step-up ratio direct-current converter. When the switch tube is switched on, the three inductors are charged, wherein the first inductor and the second inductor are charged in parallel, and the third inductor is charged by the reverse series connection of the two capacitors. After the switch tube is turned off, the three inductors are discharged simultaneously, wherein the first inductor and the second inductor are connected in series to discharge, and the third inductor is separately discharged to the capacitor. Through the charging and discharging of the three inductors, the basic structure of the invention can achieve a Boost ratio higher than the square of the Boost ratio of the Boost direct-current converter. In addition, by adding the expansion module consisting of one inductor and three diodes, the effect of charging in parallel and discharging in series of the three inductors can be realized, so that the boosting ratio is further improved. By analogy, to achieve the required higher boost ratio, a plurality of the expansion modules may be added. The invention only contains one switching tube, and the Boost ratio of the basic structure is larger than the square of the Boost ratio of the traditional Boost direct-current converter, and in addition, the Boost ratio can be further effectively improved by adding one or more expansion modules.
Drawings
FIG. 1 is an expanded schematic diagram of the main circuit of the present invention;
FIG. 2 is a typical waveform of the present invention operating in current continuous mode;
FIG. 3 is a current flow diagram for the base structure of the present invention with a partial switching tube on;
fig. 4 is a current flow diagram for the switching tube of the basic structure of the invention when it is turned off.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
the invention provides an extensible non-isolated single-tube high Boost ratio direct current converter, which can further improve the Boost ratio of the non-isolated direct current converter, the converter only comprises a switching tube, the Boost ratio of a basic structure is larger than the square of the Boost ratio of the traditional Boost direct current converter, the requirement of the high Boost ratio can be met, and in addition, the Boost ratio can be further effectively improved by adding one or more extension modules.
Example 1: referring to fig. 1, the direct current converter is an expandable non-isolated single-tube high step-up ratio direct current converter, and in fig. 1, a main circuit with a lower left corner and a rectangular frame with an upper right corner are numbered n (n is n)>2) Standard expansion module of (2), wherein the principal of the lower left cornerThe circuit comprises a base structure with a solid line part and an extension module with a dotted line part numbered 3. According to actual needs, the nodes a and b can be arranged according to the actual needs(n-1)、bnAnd c, continuing to expand the position corresponding to the n standard module.
The basic structure of the solid line part in fig. 1 comprises an input source, a switching tube, three inductors, six diodes, an intermediate capacitor, an output capacitor and a load. Input source VinAnd the emitting electrode of the switching tube Q and the output capacitor CoNegative electrode and load RoAre connected at the same time, and the positive pole is the node a and is connected at the same time to the first inductor L1And a first diode D10And a second diode D2And a second inductance L2And a first diode D10Respectively with the first inductor L1And a second inductance L2Is connected to one terminal of, and a second diode D2Respectively with the first inductor L1And a second inductance L2Is connected to the other end of the first diode D2The anode of (a) is also connected with the node a; first and second inductors (L)1、L2) A cross-over diode D is connected in series between12The anode and the cathode of which are respectively connected to a first diode D10And a second diode D2A cathode of (a); first diode D10Anode and second inductor L2Between adjacent to the first diode D10One side of the cathode is a node c near the second inductor L2One side of is node b2(ii) a Node c is connected to output diode DoAnd a summing diode DtAnode of (2), output diode DoThe cathode is divided into two paths, one path is connected to the intermediate capacitor CpNegative electrode of (2), intermediate capacitor CpIs connected to the intermediate diode DpThen connected to the output capacitor CoPositive electrode and load RoAnd the other path is connected to the intermediate inductor LpRear and middle diodes DpAre connected to the anode of a diode DtCathode and intermediate diode DpAnd an anode ofThe collectors of the switching tubes Q are connected simultaneously.
The dashed line in FIG. 1 is the extension module numbered 3, which contains the inductor L3And a diode D3、D23、D20. Wherein the diode D3Is connected to node a of the solid basic structure, while the cathode is simultaneously connected to the inductor L3And a diode D23Is connected to the cathode of a diode D23And D20Reverse series connection, point b of series connection of both2Is a diode D23The series point being node b in the basic structure2. Diode D20The cathode and the inductor L3Is connected to another end of the diode D20One side of the cathode is a node c, which is also a node c in the basic structure and is close to the inductor L3One side of is node b3。
Example 2: taking the basic structure of the solid line part in embodiment 1 as an example, the corresponding key waveforms are shown in fig. 2. It can be seen that when the infrastructure of the present invention operates in the current continuous mode, there are two modes of operation in each switching cycle, and the following is a detailed description of the two modes of operation:
mode 1 (t)0～t1): at t0The switching tube Q is turned on at any moment, the three inductors are charged simultaneously, and the charging loop is as shown in fig. 3. Wherein the inductance L1And L2Working in parallel, input voltage VinThe parallel branch is charged at the same time, so that the inductance L in this mode1And L2The current of (2) rises linearly as shown in fig. 2. And the intermediate inductance LpThen via the output capacitor CoCharging it and also the intermediate capacitor CpTherefore, the middle inductance L in this modepCurrent and intermediate capacitance CpIs also rising and the output capacitance CoThe voltage of (2) is decreased as shown in fig. 2.
Mode 2 (t)1～t2): at t1The switching tube Q is turned off at any moment, the three inductors discharge at the same time, and the discharge loop is shown in fig. 4. It can be seen that the inductance L1And L2Operating in series, via a diode DoAnd an intermediate capacitor CpTo the output capacitor CoDischarge, so that the inductance L in this mode1And L2Current synchronous linear decrease and output capacitance CoThe voltage of (2) rises. And the intermediate inductance LpThen through the intermediate diode DpTo the intermediate capacitance CpDischarge, so that the intermediate inductance L in this modepThe current of (2) is also decreased. Due to the inductance L1And L2Is greater than the intermediate inductance LpI.e. intermediate capacitance Co1Is greater than its charging current, so that the intermediate capacitor CpAs shown in fig. 2.
In summary, in the present invention, there is only one switching tube, the basic structure can realize a high step-up ratio by parallel charging and serial discharging of two inductors and independent charging and discharging of the other inductor, and the step-up ratio is larger than the square of the step-up ratio of the conventional Boost dc converter. In addition, one or more standard expansion modules can be added to further improve the boost ratio.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (3)
1. The expandable non-isolated single-tube high step-up ratio direct current converter comprises a basic structure and an expansion module, and is characterized in that the basic structure comprises a base structure and a base structure; the basic structure comprises an input source, a switching tube, three inductors, six diodes, a middle capacitor, an output capacitor and a load,
the input source VinAnd the emitting electrode of the switching tube Q and the output capacitor CoNegative electrode and load RoAre simultaneously connected, and an input source VinThe positive electrode of the first inductor is a node a and is simultaneously connected to the first inductor L1And a first diode D10And a second diode D2And a second inductance L2And a first diode D10Respectively with the anode and cathode of the first electrodeFeeling L1And a second inductance L2Is connected to one terminal of, and a second diode D2Respectively with the first inductor L1And a second inductance L2Is connected to the other end of the first diode D2The anode of (a) is also connected with the node a; first inductance L1And a second inductance L2A cross-over diode D is connected in series between12Across diode D12Are respectively connected to the first diode D10And a second diode D2A cathode of (a); first diode D10Anode and second inductor L2Between adjacent to the first diode D10One side of the cathode is a node c near the second inductor L2One side of is node b2(ii) a Node c is connected to output diode DoAnd a summing diode DtAnode of (2), output diode DoThe cathode is divided into two paths, one path is connected to the intermediate capacitor CpNegative electrode of (2), intermediate capacitor CpIs connected to the intermediate diode DpThen connected to the output capacitor CoPositive electrode and load RoAnd the other path is connected to the intermediate inductor LpRear and middle diodes DpAre connected to the anode of a diode DtCathode and intermediate diode DpThe anode of the switching tube Q is simultaneously connected with the collector of the switching tube Q;
an extension module is added on the foundation structure, and the extension module consists of an inductor Ln，n>2 and three diodes are respectively DnDiode D(n-1)nAnd a diode D(n-1)0Composition of, the diode DnIs connected to a node a in the base structure, while the cathode is simultaneously connected to the inductor LnAnd a diode D(n-1)nIs connected to the cathode of a diode D(n-1)nAnd a diode D(n-1)0Reverse series, series point b(n-1)Is a diode D(n-1)nWhen n is 3, the series point is the node b in the basic structure2Diode D(n-1)0The cathode and the inductor LnIs connected to another end of the diode D(n-1)0One side of the cathode is a node c, which is also a node c in the basic structure, close to the inductor LnOne side of is node bn。
2. The scalable non-isolated single-tube high step-up ratio dc converter according to claim 1, wherein in the basic structure, when the switching tube Q is turned on, the three inductors are charged simultaneously, wherein the first inductor L is1And a second inductance L2Charged in parallel, and the intermediate inductance LpThen by the intermediate capacitor CpAnd an output capacitor CoTwo capacitors are reversely connected in series to charge the capacitor, and after the switching tube Q is turned off, the first inductor L1A second inductor L2And an intermediate inductance LpThe three inductors are discharged simultaneously, wherein the first inductor L1And a second inductance L2Discharge in series, and intermediate inductance LpThen discharge to the intermediate capacitor C alonepThe Boost ratio of the basic structure is larger than the square of the Boost ratio of the traditional Boost direct current converter.
3. The scalable non-isolated single-tube high step-up ratio direct current converter according to claim 1 or 2, wherein one or more expansion modules are added to the base structure as required, and inductors L in the added expansion modulesnAnd a first inductance L in the base structure1And a second inductance L2And an operation mode that a plurality of inductors are charged in parallel and discharged in series is further formed, so that the boosting ratio of the direct current converter is further improved.
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Cited By (1)
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| CN113691128A (en) * | 2021-08-29 | 2021-11-23 | 三峡大学 | Single-input high-reliability Boost DC-DC converter |
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