CN115765447A - Double-coupling inductor series type direct current boost converter and control method - Google Patents
Double-coupling inductor series type direct current boost converter and control method Download PDFInfo
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- CN115765447A CN115765447A CN202211394966.9A CN202211394966A CN115765447A CN 115765447 A CN115765447 A CN 115765447A CN 202211394966 A CN202211394966 A CN 202211394966A CN 115765447 A CN115765447 A CN 115765447A
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Abstract
The invention provides a double-coupling inductor series type direct current boost converter and a control method. Belongs to the technical field of power electronic converters. The double-coupling inductor series-connection type direct current boost converter comprises a direct current voltage source, two same coupling inductor units and a direct current converter output unit. The output unit of the direct current converter consists of an output diode, an output capacitor and a load. The double-coupling inductor series-connection type direct current boost converter greatly improves the voltage gain.
Description
Technical Field
The invention belongs to the technical field of power electronic converters, and particularly relates to a double-coupling inductor series type direct current boost converter and a control method.
Background
The boost converter is widely applied to a pre-stage converter of a distributed power system to realize a boost function. The traditional Boost converter circuit topology is a Boost circuit, theoretically, the voltage gain of the Boost circuit increases along with the increase of the duty ratio, however, the actual gain of the Boost circuit is not always increased along with the increase of the duty ratio in consideration of the parasitic equivalent series impedance in the actual circuit, so that the Boost capability of the Boost converter circuit is very limited, and the Boost converter circuit topology is not suitable for the high-voltage-gain direct-current power conversion occasion.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a double-coupling inductor series type direct current boost converter and a control method.
The invention is realized by the following technical scheme, the invention provides a double-coupling inductance series type direct current boost converter, which specifically comprises: DC voltage source V in Diode D 3 Coupled inductor winding N 1 Coupled inductor winding N 3 Coupled inductor winding N 4 Coupled inductor winding N 2 Diode D 1 Diode D 2 Power switch S, output diode D o An output capacitor C o And a resistance R;
DC voltage source V in Anode and diode D 3 Positive pole and coupled inductor winding N 1 Is connected with the anode of the diode D 3 Cathode of (2), coupling inductance winding N 3 Positive pole and coupled inductor winding N 4 Is connected with the cathode of the inductor winding N 1 Cathode of (2), coupling inductance winding N 2 Anode and diode D 1 The positive electrodes of the two electrodes are connected; coupled inductor winding N 2 Cathode and diode D 2 Is connected to the anode of a diode D 2 Cathode and coupling inductor winding N 4 The positive electrodes of the two electrodes are connected; diode D 1 Cathode of (2), coupling inductance winding N 3 Cathode of power switch S, drain of power switch S and output diode D o The positive electrodes of the two electrodes are connected; output diode D o Cathode and output capacitor C o Is connected with one end of a resistor R, and an output capacitor C o Cathode of (3), the other end of the resistor R, the source of the power switch S, a direct voltage source V in Are connected to each other.
The invention provides a control method of a double-coupling inductance series type direct current boost converter, and a control signal V of the double-coupling inductance series type direct current boost converter gs Controlling the on-off of the power switch S(ii) a The whole control process is divided into 4 switching modes, namely a switching mode 1, a switching mode 2, a switching mode 3 and a switching mode 4.
Further, the switching mode 1 corresponds to the time period [ t 1 ,t 2 ]At this stage, the power switch tube S is turned on and the DC voltage V is applied in Through diode D 1 For coupling inductance winding N 1 Charging; at the same time, the DC voltage V in Through diode D 3 For coupling inductance winding N 3 Charging, due to the magnetic induction principle, by coupling with an inductive winding N 4 So that the diode D 2 Reverse bias cut-off; output diode D o Reverse bias, output capacitance C o And independently supplying power to the load resistor R, and ending the mode 1.
Further, switching mode 2, corresponding to time period [ t ] 2 ,t 3 ]At this stage, the power switch tube S is turned off and the DC voltage V is applied in Parasitic capacitance for power switch and two coupled inductor windings N 1 、N 3 Charging, modality 2 ends.
Further, the switching mode 3 corresponds to the time period [ t 3 ,t 4 ]The power switch tube S is kept off, and the diode D 1 And D 3 Reverse bias cut-off, DC voltage V in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power when two coupled inductor windings are in current i N1 、i N3 When the minimum is reached, modality 3 ends.
Further, the switching mode 4 corresponds to the time period [ t 4 ,t 5 ]Or [ t 0 ,t 1 ]When the power switch tube S is on, the DC voltage V in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power; meanwhile, the parasitic capacitance of the power switch S discharges, and when the energy release is completed, the mode 4 ends.
Further, the gain expression obtainable by the mode control is:
wherein D is the conduction duty ratio of the power switch tube S, the working range is (0, 1), and the turn ratio of the two coupling inductors is n 1 ＝N 2 :N 1 And n 2 ＝N 4 :N 3 。
Drawings
FIG. 1 is a circuit diagram of a dual-coupled inductor series DC boost converter;
FIG. 2 is a schematic diagram of the main waveforms of a dual coupled inductor series DC boost converter;
FIG. 3 is an equivalent circuit diagram for each mode; wherein (a) is an equivalent circuit diagram of a switch mode 1 of a double-coupling inductance series type direct current boost converter; (b) An equivalent circuit diagram of a switch mode 2 of a double-coupling inductance series type direct current boost converter is shown; (c) An equivalent circuit diagram of a switch mode 3 of a double-coupling inductance series type direct current boost converter is shown; (d) An equivalent circuit diagram of a switch mode 4 of a double-coupling inductance series type direct current boost converter is shown;
FIG. 4 shows the input voltage V in =50V, output voltage V o Experimental waveform diagram at 250V.
The reference numbers in the figures illustrate: v in Is a DC voltage source, S is a power switch tube, D 1 Is a first diode, D 2 Is a second diode, D 3 Is a third diode, D o To output a diode, C o For the output capacitance, R is the load resistance, N 1 、N 2 For coupling two windings of an inductor, N 3 、N 4 Two windings of another coupled inductor with turn ratio of n 1 ＝N 2 :N 1 And n 2 ＝N 4 :N 3 。
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a double-coupling inductor series type direct current boost converter, and belongs to the technical field of power electronic converters. The double-coupling inductor series type direct current boost converter comprises a direct current voltage source, two same coupling inductor units and a direct current converter output unit. The output unit of the direct current converter consists of an output diode, an output capacitor and a load resistor. The double-coupling inductor series-connection type direct current boost converter greatly improves the voltage gain.
With reference to fig. 1, the present invention specifically provides a dual-coupled inductor series dc boost converter, which specifically includes: DC voltage source V in Diode D 3 Coupled inductor winding N 1 Coupled inductor winding N 3 Coupled inductor winding N 4 Coupled inductor winding N 2 Diode D 1 Diode D 2 Power switch S, output diode D o An output capacitor C o And a resistance R;
DC voltage source V in Anode and diode D 3 Positive pole and coupled inductor winding N 1 Is connected with the anode of the diode D 3 Cathode of (2), coupling inductance winding N 3 Positive pole of (2) and coupled inductor winding N 4 Is connected with the cathode of the inductor winding N 1 Cathode of (2), coupling inductance winding N 2 Anode and diode D 1 The positive electrodes of the two electrodes are connected; coupled inductor winding N 2 Cathode and diode D 2 Is connected to the anode of a diode D 2 Cathode and coupling inductor winding N 4 The positive electrodes of the two electrodes are connected; diode D 1 Cathode of (2), coupling inductance winding N 3 Cathode of power switch S, drain of power switch S and output diode D o The positive electrodes of the two electrodes are connected; output diode D o Cathode and output capacitor C o Is connected with one end of a resistor R, and outputs a capacitor C o Cathode and resistorThe other end of R, the source of the power switch S, and a DC voltage source V in Is connected to the cathode.
The working principle and the working process of the invention are as follows:
the invention provides a control method of a double-coupling inductance series type direct current boost converter, and a control signal V of the double-coupling inductance series type direct current boost converter gs Controlling the on-off of the power switch S; the whole control process is divided into 4 switching modes, namely a switching mode 1, a switching mode 2, a switching mode 3 and a switching mode 4. Winding current i of two coupled inductors N1 、i N2 、i N3 、i N4 Diode D 1 Voltage V of D1 Diode D 2 Voltage V of D2 Diode D 3 Voltage V of D3 Output diode D o Voltage V of Do Voltage V of power switch S S The waveform of (2) is shown in fig. 2, and the whole control process is described as follows:
Switching mode 2, corresponding to time period t in FIG. 2 2 ,t 3 ]The equivalent circuit is shown in FIG. 3 (b), and at this stage, the power switch tube S is turned off and the DC voltage V is applied in Parasitic capacitance for power switch and two coupled inductor windings N 1 、N 3 Charging, modality 2 ends.
Switching mode 3, corresponding to time period t in FIG. 2 3 ,t 4 ]In the equivalent circuit shown in FIG. 3 (c), the power switch tube S is kept off and the diode D 1 And D 3 Reverse bias, cut off, straightCurrent voltage V in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power when two coupled inductor windings are in current i N1 、i N3 When the minimum is reached, mode 3 ends.
Switching mode 4, corresponding to time period t in FIG. 2 4 ,t 5 ]Or [ t 0 ,t 1 ]The equivalent circuit is shown in FIG. 3 (d), the power switch tube S is turned on, and the DC voltage V is in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power; meanwhile, the parasitic capacitance of the power switch S discharges, and when the energy release is completed, the mode 4 ends.
The gain expression that can be derived from the above mode control is:
wherein D is the conduction duty ratio of the power switch tube S, the working range is (0, 1), and the turn ratio of the two coupling inductors is n 1 ＝N 2 :N 1 And n 2 ＝N 4 :N 3 。
The following data of specific experiments illustrate the beneficial effects of the structure of the invention:
as shown in fig. 4, the input voltage V in =50V, output voltage V o ＝250V，n 1 ＝n 2 =2,d =0.4, and the load resistance R =250 Ω. Fig. 4 (a) shows the output capacitor voltage of about 250V and the input voltage of 50V. FIG. 4 (b) shows a diode D with an output diode voltage peak of about 250V o The voltage peak is about 250V. FIG. 4 (c) shows a diode D 1 (D 3 ) Voltage peak of about 166V, diode D 1 The voltage peak is about 250V. FIG. 4 (d) shows a coupled inductor winding N 1 (N 3 ) Current and coupled inductor winding N 2 (N 4 ) The current is applied. As can be seen from the figure, the double-coupled inductor series type DC boost converterHas higher output gain.
The double-coupling inductor series-connected dc boost converter and the control method provided by the present invention are described in detail above, and specific examples are applied herein to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A double-coupled inductor series DC boost converter, characterized in that the converter specifically comprises: DC voltage source V in Diode D 3 Coupled inductor winding N 1 Coupled inductor winding N 3 Coupled inductor winding N 4 Coupled inductor winding N 2 Diode D 1 Diode D 2 Power switch S, output diode D o Output capacitor C o And a resistance R;
DC voltage source V in Anode and diode D 3 Positive pole and coupled inductor winding N 1 Is connected to the anode of a diode D 3 Coupled inductor winding N 3 Positive pole of (2) and coupled inductor winding N 4 Coupled with the inductive winding N 1 Cathode of (2), coupling inductance winding N 2 Anode and diode D 1 The positive electrodes of the two electrodes are connected; coupled inductor winding N 2 Cathode and diode D 2 Is connected to the anode of a diode D 2 Cathode and coupling inductor winding N 4 The positive electrodes of the two electrodes are connected; diode D 1 Coupled inductor winding N 3 Cathode of power switch S, drain of power switch S and output diode D o The positive electrodes of the two electrodes are connected; output diode D o Cathode and output capacitor C o Is connected with one end of a resistor R, and outputs a capacitor C o Cathode of (3), the other end of the resistor R, the source of the power switch S, a DC voltage source V in Of the cathode phaseAnd (4) connecting.
2. A method as claimed in claim 1, wherein the control signal V of the double coupled inductor series dc boost converter is gs Controlling the on-off of the power switch S; the whole control process is divided into 4 switching modes, namely a switching mode 1, a switching mode 2, a switching mode 3 and a switching mode 4.
3. Method according to claim 2, characterized in that switching mode 1, corresponds to a time period [ t [ t ] ] 1 ,t 2 ]At this stage, the power switch tube S is turned on and the DC voltage V is applied in Through diode D 1 For coupling inductance winding N 1 Charging; at the same time, the DC voltage V in Through diode D 3 For coupling inductance winding N 3 Charging, due to the principle of magnetic induction, by coupling with an inductive winding N 4 So that the diode D 2 Reverse bias cut-off; output diode D o Reverse bias, output capacitance C o And (4) independently supplying power to the load resistor R, and ending the mode 1.
4. A method according to claim 3, characterized by switching mode 2, corresponding to time period [ t [ ] 2 ,t 3 ]At this stage, the power switch tube S is turned off and the DC voltage V is applied in Parasitic capacitance for power switch and two coupling inductance windings N 1 、N 3 Charging, modality 2 ends.
5. Method according to claim 4, characterized in that switching mode 3, corresponding to the time period [ t [ t ] ] 3 ,t 4 ]The power switch tube S is kept off, and the diode D 1 And D 3 Reverse bias cut-off, DC voltage V in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power when two coupled inductor windings are in current i N1 、i N3 When minimized, modeAnd 3, ending.
6. Method according to claim 5, characterized in that switching mode 4, corresponds to a time period [ t [ t ] ] 4 ,t 5 ]Or [ t 0 ,t 1 ]Power switch tube S is on, DC voltage V in And two coupled inductor windings N 1 、N 2 、N 3 、N 4 Through an output diode D o To a load resistor R and an output capacitor C o Supplying power; meanwhile, the parasitic capacitance of the power switch S discharges, and when the energy release is completed, the mode 4 ends.
7. The method of claim 6, wherein the gain expression obtainable from the modal control is:
wherein D is the conduction duty ratio of the power switch tube S, the working range is (0, 1), and the turn ratio of the two coupling inductors is n 1 ＝N 2 :N 1 And n 2 ＝N 4 :N 3 。
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Cited By (1)
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| CN117335662A (en) * | 2023-09-07 | 2024-01-02 | 东北电力大学 | L-source direct-current boost converter based on gamma-type coupling inductance voltage doubling unit and control method thereof |
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