CN216599417U - Cascaded switch capacitor coupling inductor high-gain DC-DC converter - Google Patents
Cascaded switch capacitor coupling inductor high-gain DC-DC converter Download PDFInfo
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Abstract
The utility model belongs to the technical field of DC-DC conversion equipment, and relates to a cascade switch capacitor coupling inductor high-gain DC-DC converter, which utilizes an improved novel coupling inductor unit, avoids the occurrence of limit duty ratio by adjusting the turn ratio of a coupling inductor winding, realizes the ideal purpose of obtaining high boost gain under the condition of small duty ratio, reduces the voltage stress of a circuit by utilizing the designed coupling inductor winding, reduces electromagnetic interference, increases the reliability of the circuit structure, has reasonable integral design, safe use, simple operation, larger application potential, fewer used devices and low design cost, reduces the loss of devices, and improves the working efficiency of the circuit.
Description
Technical Field
The utility model belongs to the technical field of DC-DC conversion equipment, and relates to a cascade switch capacitor coupling inductor high-gain DC-DC converter.
Background
Currently, the global energy crisis and environmental crisis are becoming more serious, which greatly promotes the development of clean energy and green energy. Green energy technologies such as fuel cells, photovoltaic power sources and wind power generation all have excellent development prospects, but relatively high voltage is needed during grid connection, so that a conversion circuit is needed to have high efficiency and boost gain. Such as: the photovoltaic power supply is a clean energy system which is developed rapidly at present, but the output voltage of a single photovoltaic panel is very low, and a plurality of photovoltaic panels must be output jointly in a series-parallel connection mode, but the failure rate of the whole power supply system is increased, the size of the whole power supply system is overlarge, and the efficiency is low.
Therefore, it is an urgent need to solve the problem of how to obtain a stable high output voltage by using an independent module. Document "H Ardi, a Ajami, and M sabahi. a novel high step-up DC-DC converter with continuous input current integrating converter for regenerative currents application [ J ]. ieee transactions on industrial electronics,2018,65(2): 1306-1315" proposes a coupled inductive converter with continuous input current, but this converter is a hard switch with very high switching losses, and the adoption of soft switching technology is an effective method to overcome switching losses and to improve the efficiency of the power converter; the document "M Forouzesh, Y Shen, K Yari, Y P Siwakoti, and F Blaabjerg. high-efficiency high step-up DC-DC converter with dual coupled inductors for grid-connected photovoltaic systems [ J ]. IEEEtransformed on power electronics,2018,33(7):5967- > 5982" proposes a soft switching converter with a snubber capacitor active clamp circuit, which, although excellent in performance, comprises four switching tubes, complicating the structure and increasing the cost; the document "S W Lee and H L Do. high step-up coupled-inductor cathode DC-DC converter with a low loss passive transformer, 7753-. Quasi-impedance source (QZS) networks provide continuous input current and common input and output, and are therefore widely used, and the documents "M Haji-Esmaeili, E Babaei, and M sabahi.high step-up quadrature-Z source DC-DC converter [ J ]. ieee transactions on power electronics,2018,33 (12): 10563-.
In the current research, many types of DC-DC boost converter circuits have appeared, which are simple in structure and easy to control, but still cannot achieve a high and desirable boost gain. With the development of research, some topologies that unit modules such as a switching inductor and a coupling inductor are introduced to realize high boost gain appear, but problems such as high circuit voltage stress and low boost efficiency occur due to leakage inductance. In addition, the multi-stage circuit can be cascaded, and higher voltage gain is obtained under the condition of smaller through duty ratio, but the number of components in the circuit is increased, the complexity of the circuit is improved, the design cost is increased, and the working efficiency is reduced. Therefore, finding a DC-DC conversion circuit that can obtain a higher boost gain at a lower through duty ratio, and has a simple structure and high operating efficiency has become a research hotspot in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a cascaded switch capacitor coupling inductor high-gain DC-DC converter, which can obtain higher voltage gain under the condition of small duty ratio, has higher degree of freedom in voltage gain adjustment, and has the advantages of fewer used devices in the circuit structure, high working efficiency and low failure rate. Meanwhile, the clamping structure can absorb the leakage inductance energy of the transformer and clamp the voltage peak generated on the switching tube S.
In order to achieve the above object, the cascaded switch capacitor coupled inductor high-gain DC-DC converter of the present invention includes a DC power supply, three coupling windings, a power switch tube, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a load, wherein the three coupling windings are composed of a first winding, a second winding, and a third winding, and the power switch tube, the first capacitor, the second capacitor, and the second diode form a clamping structure; the homonymous end of the first winding is connected with the anode of a direct-current power supply and the anode of a first diode respectively, the synonym end of the first winding is connected with the drain electrode of a power switch tube and the cathode of a first capacitor respectively, the homonymous end of the second winding is connected with the cathode of the first diode, the anode of a second diode and the anode of the first capacitor respectively, the synonym end of the second winding is connected with the cathode of a third capacitor, the homonymous end of the third winding is connected with the cathode of a third diode, the anode of a fourth diode and the anode of the third capacitor respectively, and the synonym end of the third winding is connected with the cathode of a fourth capacitor; the drain electrode of the power switch tube is connected with the cathode of the first capacitor, the source electrode of the power switch tube is respectively connected with the cathode of the direct current power supply and the cathode of the second capacitor, the negative electrode of the fifth capacitor, the sixth capacitor and the load are connected, the positive electrode of the first capacitor is respectively connected with the negative electrode of the first diode and the positive electrode of the second diode, the positive electrode of the second capacitor is respectively connected with the negative electrode of the second diode and the positive electrode of the third diode, the negative electrode of the second capacitor is grounded with the negative electrode of the voltage source, the positive electrode of the second diode is connected with the negative electrode of the first diode, the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is respectively connected with the positive electrode of the fifth capacitor and the positive electrode of the fifth diode, the negative electrode of the fifth diode is connected with the positive electrode of the sixth diode, and the negative electrode of the sixth diode is respectively connected with the positive electrode of the sixth capacitor and the load.
Further, the turn ratio of the first winding, the second winding and the third winding is 1: n1:n2。
Furthermore, the second diode is conducted with the power switch tube in a complementary mode, and the clamping structure can effectively clamp voltage spikes generated on the power switch tube.
The utility model switches the working state of the circuit by controlling the on-off of the switching tube, thereby controlling whether the direct current power supply provides energy required by the circuit work for the coupling inductance module, realizing the change of the input and output voltage gain by changing the duty ratio and the turn ratio of the coupling winding, realizing the control of the boosting multiple of the output voltage of the direct current power supply by changing the turn ratio of the corresponding coupling winding.
Compared with the existing DC-DC boost converter circuit topological structure, the utility model avoids the occurrence of limit duty ratio by utilizing the improved novel coupling inductance unit and adjusting the turn ratio of the coupling inductance winding, realizes the ideal purpose of obtaining high boost gain under the condition of small duty ratio, reduces the voltage stress of the circuit by utilizing the designed connection mode of the coupling inductance winding, reduces the electromagnetic interference, increases the reliability of the circuit structure, has reasonable integral design, safe use, simple operation, larger application potential, fewer used devices and low design cost, reduces the device loss, improves the working efficiency of the circuit, and basically achieves the ideal effect of the design requirement.
Description of the drawings:
fig. 1 is a schematic diagram of the main circuit structure of the present invention.
Fig. 2 is a schematic diagram of the on-state operation of the power switch tube according to the present invention.
Fig. 3 is a schematic diagram of the off state of the power switch tube according to the present invention.
The specific implementation mode is as follows:
the utility model is further described with reference to the following figures and examples.
Example (b):
the cascaded switch capacitor coupling inductor high-gain DC-DC converter structure shown in FIG. 1 comprises a DC power supply VgThree coupling windings, power switch tube S and first diode D1A second diode D2A third diode D3A fourth diode D4A fifth diode D5A sixth diode DoA first capacitor C1A second capacitor C2A third capacitor C3A fourth capacitor C4A fifth capacitor C5A sixth capacitor CoAnd a load RlWherein the three-coupled winding is composed of a first winding N1A second winding N2And a third winding N3Comprises a power switch tube S and a first capacitor C1A second capacitor C2And a second diode D2Forming a clamping structure; first winding N1Are respectively connected with a DC power supply VgAnd a first diode D1Is connected to the anode of the first winding N1The different name end of the first capacitor is respectively connected with the drain electrode of the power switch tube S and the first capacitor C1Is connected to the negative pole of the second winding N2The same name terminal of (1) is respectively connected with the first diode D1Cathode of (2), second diode D2And a first capacitor C1Is connected to the positive pole of the second winding N2The different name terminal and the third capacitor C3Of the third winding N3Are connected with a third diode D3Cathode of (2), fourth diode D4Anode and third capacitor C3Is connected to the positive pole of the third winding N3End of synonym and fourth capacitor C4Is negativeConnecting the poles; drain electrode of power switch tube S and first capacitor C1Is connected with the negative electrode of the power switch tube S, and the source electrodes of the power switch tube S are respectively connected with the direct current power supply VgNegative electrode of (1), second capacitor C2Negative electrode of (1), fifth capacitor C5Negative electrode of (1), sixth capacitor CoAnd a load RlConnected by a first capacitor C1Respectively with a first diode D1And a second diode D2Is connected to the anode of a second capacitor C2Respectively with a second diode D2And a third diode D3Is connected to the anode of a second capacitor C2Negative pole of (2) and voltage source VgIs connected to the negative pole of the second diode D2And the first diode D1Is connected to the cathode of a second diode D2Cathode of and a third diode D3Is connected to the anode of a third diode D3And a fourth diode D4Is connected to the anode of a fourth diode D4Respectively with a fifth capacitor C5And a fifth diode D5Is connected to the anode of a fifth diode D5Cathode of and a sixth diode DoIs connected to the anode of a sixth diode DoRespectively with a sixth capacitor CoPositive electrode and load RlAnd (4) connecting.
In this embodiment, the turn ratio between the windings of the coupling inductor is n1＝N2:N1,n2＝N3:N1By changing the turns ratio of the coupled windings, a more flexible high voltage conversion capability can be achieved.
In this embodiment, the cascaded switch capacitor coupling inductor high-gain DC-DC converter has two working states in the continuous working mode:
(1) the operation state in the through state is shown in FIG. 2, the power switch tube S and the first diode D1A third diode D3A fifth diode D5Conducting, sixth diode DoA second diode D2A fourth diode D4Reverse cut-off when the DC power supply VgThe first winding N is formed by a power switch tube S1Supply of energy, N1The current linearly increases and passes through the first diode D1Is a first capacitor C1Charging, second capacitor C2And a second winding N2Are together a third capacitor C3And a first capacitor C1Charging, fifth capacitor C5And a third winding N3Together being a fourth capacitance C4A third capacitor C3And a first capacitor C1Charging, sixth capacitor CoIs a load RlProviding energy;
(2) the working state in the off state is shown in fig. 3, the power switch tube S is completely turned off, and the sixth diode DoA second diode D2And a fourth diode D4Conducting the first diode D1A third diode D3A fifth diode D5Reverse cut-off when the DC power supply VgA first winding N1And a first capacitor C1Through a second diode D2Is a second capacitance C2Charging, DC power supply VgFirst winding N1A first capacitor C1And a third capacitance C3Through a fourth diode D4Is a fifth capacitance C5Charging, DC power supply VgA first winding N1A first capacitor C1A third capacitor C3And a fourth capacitance C4By outputting a sixth diode DoTo a sixth capacitor CoAnd a load RlAnd supplying energy, and finishing the state when a conducting signal of the power switch tube S arrives.
The present embodiment utilizes the first and second windings L of the coupling inductorN1、LN2The inductance volt-second balance rule obtains an expression of the output voltage:
wherein B is the power of the converterVoltage gain, D is duty ratio, and n is turn ratio; when the design requires that the output voltage is converted into more than 10 times of the input voltage, if the expression V of the Boost gain of the traditional Boost circuit is usedo＝VgAnd (1-D) calculating that when the 10-time boosting gain required by the design is achieved, the required duty ratio D must reach 0.9, and as is known, the switching tube of the circuit is in a limit state, so that the working efficiency of the whole circuit is easily affected, the probability of damage of devices is increased, and the boosting conversion efficiency of the whole circuit is finally affected. In the present embodiment, if the design requires that the circuit structure can obtain 10 times of boost gain, when the through duty ratio is 0.1, the number of turns of the coupling winding only needs to satisfy n1＝2、n2The output requirement can be achieved as long as 1.1. Therefore, when the design requirement obtains a high boost multiple, the occurrence of the condition of the limit duty ratio is avoided, the switching loss of the device is reduced, the probability of the device damage is reduced, and the safety and the reliability of the converter topology are further improved, so that the working efficiency of the circuit is integrally improved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (1)
1. A cascade switch capacitor coupling inductor high-gain DC-DC converter is characterized by comprising a direct-current power supply, three coupling windings, a power switch tube, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a load, wherein the three coupling windings comprise a first winding, a second winding and a third winding, and the power switch tube, the first capacitor, the second capacitor and the second diode form a clamping structure; the homonymous end of the first winding is connected with the anode of a direct-current power supply and the anode of a first diode respectively, the synonym end of the first winding is connected with the drain electrode of a power switch tube and the cathode of a first capacitor respectively, the homonymous end of the second winding is connected with the cathode of the first diode, the anode of a second diode and the anode of the first capacitor respectively, the synonym end of the second winding is connected with the cathode of a third capacitor, the homonymous end of the third winding is connected with the cathode of a third diode, the anode of a fourth diode and the anode of the third capacitor respectively, and the synonym end of the third winding is connected with the cathode of a fourth capacitor; the drain electrode of the power switch tube is connected with the cathode of the first capacitor, the source electrode of the power switch tube is respectively connected with the cathode of the direct current power supply and the cathode of the second capacitor, the negative electrode of the fifth capacitor, the sixth capacitor and the load are connected, the positive electrode of the first capacitor is respectively connected with the negative electrode of the first diode and the positive electrode of the second diode, the positive electrode of the second capacitor is respectively connected with the negative electrode of the second diode and the positive electrode of the third diode, the negative electrode of the second capacitor is grounded with the negative electrode of the voltage source, the positive electrode of the second diode is connected with the negative electrode of the first diode, the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is respectively connected with the positive electrode of the fifth capacitor and the positive electrode of the fifth diode, the negative electrode of the fifth diode is connected with the positive electrode of the sixth diode, and the negative electrode of the sixth diode is respectively connected with the positive electrode of the sixth capacitor and the load.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116317540A (en) * | 2023-03-08 | 2023-06-23 | 广东工业大学 | High gain ratio direct current converter based on multistage switch capacitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116317540A (en) * | 2023-03-08 | 2023-06-23 | 广东工业大学 | High gain ratio direct current converter based on multistage switch capacitor |
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