CN115642799B - High-gain coupling inductance Z-source direct-current boost converter and control method - Google Patents
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Abstract
The invention provides a high-gain coupling inductance Z-source direct-current boost converter and a control method. Belongs to the technical field of power electronic converters. The high-gain coupling inductance Z-source direct-current boost converter comprises a direct-current voltage source, two identical coupling inductance boost units and an X-source structure. Each coupling inductance boosting unit comprises a coupling inductance, a diode and a capacitor, and the X source structure consists of two crossed capacitors. The high-gain coupling inductance Z-source direct-current boost converter greatly improves voltage gain.
Description
Technical Field
The invention belongs to the technical field of power electronic converters, and particularly relates to a high-gain coupling inductance Z-source direct-current boost converter and a control method.
Background
The boost converter is widely applied to a front-stage converter of a distributed power system to realize the boost function. The traditional Boost converter circuit topology is a Boost circuit, in theory, the voltage gain of the Boost circuit increases along with the increase of the duty ratio, however, in consideration of the parasitic equivalent series impedance in the actual circuit, the actual gain of the Boost circuit does not always become larger along with the increase of the duty ratio, so that the Boost capability of the Boost circuit is very limited, and the Boost circuit is not suitable for the occasion of high-gain direct current power conversion.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-gain coupling inductance Z-source direct-current boost converter and a control method.
The invention is realized by the following technical scheme, and provides a high-gain coupling inductance Z-source direct current boost converter, which comprises the following components in detail: diode D in Capacitance C 1 Capacitance C 3 Diode D 1 Coupled inductor winding N 2 Coupled inductor winding N 1 Output diode D o Capacitance C 2 Power switch SW, output capacitance C o Resistor R, capacitor C 4 Diode D 2 Coupled inductor winding N 4 And a coupling inductance winding N 3 ；
Positive electrode and diode D of direct-current voltage source in The positive electrode of diode D is connected with in Cathode and capacitor C of (2) 1 Positive electrode, capacitor C 3 Cathode and diode D of (D) 1 Is connected with the positive electrode of the battery; capacitor C 3 Positive pole of (a) and coupling inductance winding N 2 Is connected with the positive electrode of the battery; diode D 1 Is coupled to the cathode of the inductor winding N 1 Is connected with the positive electrode of the battery; coupling inductance winding N 1 Is coupled to the cathode of the inductor winding N 2 Cathode, output diode D o Positive electrode of (C) and capacitor (C) 2 Is connected with the positive electrode of the power switch SW; output diode D o Cathode and output capacitance C of (2) o The positive electrode of the resistor R is connected with one end of the resistor R; output capacitor C o The other end of the resistor R, the source of the power switch SW, the capacitor C 1 Capacitance C 4 Cathode, diode D of (2) 2 Is connected with the positive electrode of the battery; capacitor C 4 Positive pole of (a) and coupled inductance winding N 4 The positive electrode of diode D is connected with 2 Cathode of (a) and coupled inductor winding N 3 Is connected with the positive electrode of the battery; coupling inductance winding N 3 Is coupled to the cathode of the inductor winding N 4 Cathode of DC voltage source, and capacitor C 2 Is connected to the cathode of the battery.
The invention provides a control method of a high-gain coupling inductance Z-source direct-current boost converter, which comprises the following steps of gs Controlling the on-off of the power switch SW; 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 a time period [ t ] 1 ,t 2 ]At this stage, the power switch tube SW is turned on, the capacitor C 1 Through diode D 1 To the coupled inductor winding N 1 Charging, coupling inductance winding N due to magnetic induction principle 1 And N 2 Through diode D 2 Give electric capacity C 3 Charging; at the same time, capacitor C 2 Through diode D 2 To the coupled inductor winding N 3 Charging, coupling inductance winding N due to magnetic induction principle 3 And N 4 Through diode D 2 Give electric capacity C 4 Charging; output diode D o And input diode D in Reverse bias, output capacitance C o For the load resistor RImmediately, power is supplied, and modality 1 ends.
Further, the switching mode 2 corresponds to a time period [ t ] 2 ,t 3 ]At this stage, the power switch tube SW is turned off, and the capacitor C 1 And capacitor C 2 Parasitic capacitance and two coupling inductance windings N for power switch 1 、N 2 、N 3 、N 4 Charging, modality 2 ends.
Further, the switching mode 3 corresponds to a time period [ t ] 3 ,t 4 ]The power switch tube SW is kept off, and the diode D 1 And D 2 Turn-off, DC voltage V in Capacitance C 3 And C 4 Two coupled inductor windings N 2 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o Supplying power when two coupled inductor winding currents i N1 、i N3 When it is minimized, modality 3 ends.
Further, the switching mode 4 corresponds to a time period [ t ] 4 ,t 5 ]Or [ t ] 0 ,t 1 ]The power switch tube SW is turned on, and the direct current voltage V in Capacitance C 1 And C 2 Two coupled inductor windings N 3 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o At the same time as the power is supplied, the parasitic capacitance of the power switch SW discharges, and when the energy release is completed, the mode 4 ends.
Further, the gain expression obtainable according to the above-described modal control is:
wherein D is the on-duty ratio of the power switch tube SW, the working range is (0, 1), 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 block diagram of a high gain coupled inductor Z-source DC boost converter;
FIG. 2 is a main waveform diagram of a high gain coupled inductor Z-source DC boost converter;
FIG. 3 is a diagram of an equivalent circuit for each mode; wherein (a) is an equivalent circuit diagram of a switching mode 1 of the high-gain coupling inductance Z-source direct-current boost converter; (b) An equivalent circuit diagram of a switching mode 2 of the high-gain coupling inductance Z-source direct-current boost converter; (c) An equivalent circuit diagram of a switching mode 3 of the high-gain coupling inductance Z-source direct-current boost converter; (d) An equivalent circuit diagram of a switching mode 4 of the high-gain coupling inductance Z-source direct-current boost converter;
FIG. 4 shows the voltage V in =50v, output voltage V o Experimental waveform at=300V.
The reference numerals in the figures illustrate: v (V) in Is a direct-current voltage source, SW is a power switch tube, D in For input diode D 1 Is a first voltage-multiplying diode D 2 Is a second voltage-multiplying diode, C 1 For the first X source capacitance, C 2 For the second X source capacitance, C 3 C is the first voltage-multiplying capacitor 4 Is the second voltage-multiplying capacitor D o For the output diode, C o Is output capacitance, R is load resistance, N 1 、N 2 To couple two windings of the inductance, N 3 、N 4 Two windings of another coupling inductance, the turns ratio of the two coupling inductances being n respectively 1 ＝N 2 :N 1 And n 2 ＝N 4 :N 3 。
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a high-gain coupling inductance Z-source direct-current boost converter, and belongs to the technical field of power electronic converters. The high-gain coupling inductance Z-source direct-current boost converter comprises a direct-current voltage source, two identical coupling inductance boost units and an X-source structure. Each coupling inductance boosting unit comprises a coupling inductance, a diode and a capacitor, and the X source structure consists of two crossed capacitors. The high-gain coupling inductance Z-source direct-current boost converter greatly improves voltage gain.
Referring to fig. 1, the present invention specifically proposes a high-gain coupled inductor Z-source dc boost converter, the converter specifically comprising: diode D in Capacitance C 1 Capacitance C 3 Diode D 1 Coupled inductor winding N 2 Coupled inductor winding N 1 Output diode D o Capacitance C 2 Power switch SW, output capacitance C o Resistor R, capacitor C 4 Diode D 2 Coupled inductor winding N 4 And a coupling inductance winding N 3 ；
Positive electrode and diode D of direct-current voltage source in The positive electrode of diode D is connected with in Cathode and capacitor C of (2) 1 Positive electrode, capacitor C 3 Cathode and diode D of (D) 1 Is connected with the positive electrode of the battery; capacitor C 3 Positive pole of (a) and coupling inductance winding N 2 Is connected with the positive electrode of the battery; diode D 1 Is coupled to the cathode of the inductor winding N 1 Is connected with the positive electrode of the battery; coupling inductance winding N 1 Is coupled to the cathode of the inductor winding N 2 Cathode, output diode D o Positive electrode of (C) and capacitor (C) 2 Is connected with the positive electrode of the power switch SW; output diode D o Cathode and output capacitance C of (2) o The positive electrode of the resistor R is connected with one end of the resistor R; output capacitor C o The other end of the resistor R, the source of the power switch SW, the capacitor C 1 Capacitance C 4 Cathode, diode D of (2) 2 Is connected with the positive electrode of the battery; capacitor C 4 Positive pole of (a) and coupled inductance winding N 4 The positive electrode of diode D is connected with 2 Cathode of (a) and coupled inductor winding N 3 Is connected with the positive electrode of the battery; coupling inductance winding N 3 Is coupled to the cathode of the inductor winding N 4 Cathode of a direct voltage sourceCapacitor C 2 Is connected to the cathode of the battery.
The working principle and working process of the invention are as follows:
the invention provides a control method of a high-gain coupling inductance Z-source direct-current boost converter, which comprises the following steps of gs Controlling the on-off of the power switch SW; 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 inductances N1 、i N2 、i N3 、i N4 Diode D 1 Voltage V of (2) D1 Diode D 2 Voltage V of (2) D2 Output diode D o Voltage V of (2) Do Voltage V of power switch SW SW The waveform of (2) is shown in figure 2. The specific 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), at this stage, the power switch SW is turned off, and the capacitor C 1 And capacitor C 2 Parasitic capacitance and two coupling inductance windings N for power switch 1 、N 2 、N 3 、N 4 Charging, modality 2 ends.
Switching mode 3, corresponding to time period [ t ] in FIG. 2 3 ,t 4 ]As shown in fig. 3 (c), the equivalent circuit is that the power switch tube SW is kept off, and the diode D 1 And D 2 Turn-off, DC voltage V in Capacitance C 3 And C 4 Two coupled inductor windings N 2 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o Supplying power when two coupled inductor winding currents i N1 、i N3 When it is minimized, modality 3 ends.
The switching mode 4 corresponds to the time period [ t ] in FIG. 2 4 ,t 5 ]Or [ t ] 0 ,t 1 ]As shown in FIG. 3 (d), the equivalent circuit is that the power switch SW is turned on, and the DC voltage V in Capacitance C 1 And C 2 Two coupled inductor windings N 3 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o At the same time as the power is supplied, the parasitic capacitance of the power switch SW discharges, and when the energy release is completed, the mode 4 ends.
The gain expression obtained according to the above-described mode control is:
wherein D is the on-duty ratio of the power switch tube SW, the working range is (0, 1), 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 through 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 ＝300V，n 1 ＝n 2 =1.5, d=0.1, load r=300Ω. FIG. 4 (a) shows an output capacitor voltage of about 300V and a capacitor C 1 、C 2 Voltage of about 150V and capacitance C 3 、C 4 The voltage is about 75V. FIG. 4 (b) shows the output diode voltage peak value of about 300V and diode D 1 、D 2 Peak voltageThe value is about 84V and the peak power switch SW voltage is about 300V. FIG. 4 (c) shows a coupled inductor winding N 1 Current and coupled inductor winding N 2 A current. As can be seen from the figure, the high-gain coupled inductor Z-source dc boost converter has a higher output gain.
The high-gain coupling inductance Z-source direct current boost converter and the control method provided by the invention are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (3)
1. A high gain coupled inductor Z source dc boost converter, the converter comprising: diode D in Capacitance C 1 Capacitance C 3 Diode D 1 Coupled inductor winding N 2 Coupled inductor winding N 1 Output diode D o Capacitance C 2 Power switch SW, output capacitance C o Load resistor R, capacitor C 4 Diode D 2 Coupled inductor winding N 4 And a coupling inductance winding N 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the inductance winding N is coupled 1 And a coupling inductance winding N 2 For the two windings of the first coupling inductance, the coupling inductance winding N 3 And a coupling inductance winding N 4 Two windings that are a second coupling inductance;
positive electrode and diode D of direct-current voltage source in The positive electrode of diode D is connected with in Cathode and capacitor C of (2) 1 Positive electrode, capacitor C 3 Cathode and diode D of (D) 1 Is connected with the positive electrode of the battery; capacitor C 3 Positive pole of (a) and coupling inductance winding N 2 Is connected with the positive electrode of the battery; diode D 1 Is coupled to the cathode of the inductor winding N 1 Is connected with the positive electrode of the battery; coupling inductance winding N 1 Cathode, coupled inductor windingN 2 Cathode, output diode D o Positive electrode of (C) and capacitor (C) 2 Is connected with the positive electrode of the power switch SW; output diode D o Cathode and output capacitance C of (2) o The positive electrode of the load resistor R is connected with one end of the load resistor R; output capacitor C o The cathode of the load resistor R, the source of the power switch SW, the capacitor C 1 Cathode, capacitor C of (2) 4 Cathode, diode D of (2) 2 Is connected with the positive electrode of the battery; capacitor C 4 Positive pole of (a) and coupled inductance winding N 4 The positive electrode of diode D is connected with 2 Cathode of (a) and coupled inductor winding N 3 Is connected with the positive electrode of the battery; coupling inductance winding N 3 Is coupled to the cathode of the inductor winding N 4 Cathode of DC voltage source, and capacitor C 2 Is connected to the cathode of the battery.
2. The control method of the high-gain coupled inductor Z-source direct current boost converter according to claim 1, wherein the high-gain coupled inductor Z-source direct current boost converter signal V gs Controlling the on-off of the power switch SW; 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;
switching mode 1, corresponding to time period [ t ] 1 ,t 2 ]At this stage, the power switch SW is turned on, the capacitor C 1 Through diode D 1 To the coupled inductor winding N 1 Charging, coupling inductance winding N due to magnetic induction principle 1 And N 2 Through diode D 1 Give electric capacity C 3 Charging; at the same time, capacitor C 2 Through diode D 2 To the coupled inductor winding N 3 Charging, coupling inductance winding N due to magnetic induction principle 3 And N 4 Through diode D 2 Give electric capacity C 4 Charging; output diode D o And input diode D in Reverse bias, output capacitance C o The load resistor R is independently powered, and the switching mode 1 is ended;
switching mode 2, corresponding to time period [ t ] 2 ,t 3 ]At this stage, the power switch SW is turned offCapacitance C 1 And capacitor C 2 Parasitic capacitance and coupling inductance windings N for power switch SW 1 、N 2 、N 3 、N 4 Charging, and ending the switching mode 2;
switching mode 3, corresponding to time period [ t ] 3 ,t 4 ]The power switch SW is kept off, the diode D 1 And D 2 Turn-off, DC voltage source V in Capacitance C 3 And C 4 Two coupled inductor windings N 2 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o When power is supplied to two coupled inductance windings N 2 、N 4 Is the current i of (2) N2 、i N4 When the switching mode is reduced to the lowest, the switching mode 3 is ended;
switching mode 4, corresponding to time period [ t ] 4 ,t 5 ]Or [ t ] 0 ,t 1 ]The power switch SW is turned on, the DC voltage source V in Capacitance C 1 And C 2 Two coupled inductor windings N 2 And N 4 Through the output diode D o And input diode D in For load resistor R and output capacitor C o At the same time as the power is supplied, the parasitic capacitance of the power switch SW discharges, and when the energy release is completed, the switching mode 4 ends.
3. The method of claim 2, wherein the gain expression obtainable according to the mode control is:
wherein D is the on duty ratio of the power switch SW, the working range is (0, 1), 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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| CN105827110A (en) * | 2016-05-30 | 2016-08-03 | 安徽工业大学 | Three-winding coupled inductor voltage-doubling type single switch tube boost direct-current converter |
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| US7161331B2 (en) * | 2005-04-11 | 2007-01-09 | Yuan Ze University | Boost converter utilizing bi-directional magnetic energy transfer of coupling inductor |
| US8634217B2 (en) * | 2010-09-30 | 2014-01-21 | Intersil Americas Inc. | System and method for converting an AC input voltage to a regulated DC output voltage using a Z-type converter with rectified switches |
| JP2014050143A (en) * | 2012-08-29 | 2014-03-17 | Toyo Electric Mfg Co Ltd | Z-source inverter |
| CN104734547B (en) * | 2015-03-19 | 2017-08-04 | 南京航空航天大学 | A kind of boosting unit Z-source inverter |
| CN105490529A (en) * | 2015-12-27 | 2016-04-13 | 华南理工大学 | Hybrid Z-source converter |
| CN110768552A (en) * | 2019-11-08 | 2020-02-07 | 东北电力大学 | Double-coil coupling inductance type impedance source inverter for inhibiting DC link voltage peak |
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| CN105827110A (en) * | 2016-05-30 | 2016-08-03 | 安徽工业大学 | Three-winding coupled inductor voltage-doubling type single switch tube boost direct-current converter |
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