CN214900688U - Inverter circuit based on Buck-Boost converter - Google Patents
Inverter circuit based on Buck-Boost converter Download PDFInfo
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- CN214900688U CN214900688U CN202121136146.0U CN202121136146U CN214900688U CN 214900688 U CN214900688 U CN 214900688U CN 202121136146 U CN202121136146 U CN 202121136146U CN 214900688 U CN214900688 U CN 214900688U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model belongs to the technical field of the photovoltaic power generation technique and specifically relates to indicate an inverter circuit based on Buck-Boost converter, it includes input power Udc, switch tube Q1, switch tube Q2, switch tube Q3, switch tube Q4, switch tube Q5, diode VD1, diode VD2, diode VD3, electric capacity C1, impedance Z, inductance L1 and inductance Ldc, the positive pole of power Udc is connected with switch tube Q5's source electrode, and switch tube Q5's drain electrode is connected with switch tube Q3's drain electrode, inductance Ldc's one end and diode VD 1's negative pole respectively, and switch tube Q3's source electrode is connected with diode VD 3's negative pole, and inductance Ldc's the other end is connected with switch tube Q4's source electrode and diode VD 2's positive pole respectively. The utility model discloses a nonlinear pulse width modulation makes to be linear relation between output voltage and the sinusoidal modulation ripples, is applicable to the occasion of wide range voltage input.
Description
Technical Field
The utility model belongs to the technical field of the photovoltaic power generation technique and specifically relates to indicate an inverter circuit based on Buck-Boost converter.
Background
In a photovoltaic power generation system, the output voltage of a solar panel is not constant, but is affected by environmental factors such as weather and illumination, and the output voltage fluctuates within a certain range. At present, most medium and small power photovoltaic inverters adopt a voltage type full-bridge inversion topology, and only voltage reduction inversion can be realized, so that a large-capacitance bus capacitor is required to be used for voltage stabilization, filtering and decoupling; the cost is high, and certain limitation exists in the application. The traditional buck-boost inverter carries out buck-boost and isolation by a transformer, but the power density of the system is reduced due to the existence of the transformer. Meanwhile, the multi-level inverter has multiple energy conversion levels and low efficiency; compared with an isolated inverter and a multi-stage inverter, the single-stage non-isolated inverter has obvious advantages in the aspects of volume, cost, efficiency and the like.
The voltage source bridge inverter is derived from a Buck circuit, which is also the root cause of the Buck inverter. In a basic chopper circuit, a Buck-Boost topology has a voltage boosting and reducing function and is a single-stage topology. The utility model provides an inverter circuit based on Buck-Boost converter adopts nonlinear pulse width modulation, makes to be linear relation between output voltage and the sinusoidal modulation ripples, is applicable to the occasion of wide range voltage input.
Disclosure of Invention
The utility model discloses problem to prior art provides an inverter circuit based on Buck-Boost converter, adopts nonlinear pulse width modulation, makes to be linear relation between output voltage and the sinusoidal modulation ripples, is applicable to the occasion of wide range voltage input.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides an inverter circuit based on Buck-Boost converter, including input power Udc, switch tube Q1, switch tube Q2, switch tube Q3, switch tube Q4, switch tube Q5, diode VD1, diode VD2, diode VD3, electric capacity C1, impedance Z, inductance L1 and inductance Ldc;
the positive electrode of the power supply Udc is connected with the source electrode of a switching tube Q5, the drain electrode of the switching tube Q5 is respectively connected with the drain electrode of a switching tube Q3, one end of an inductor Ldc and the cathode of a diode VD1, the source electrode of the switching tube Q3 is connected with the cathode of a diode VD3, the anode of a diode VD3 and the drain electrode of a switching tube Q4 are both connected with the negative electrode of an input power Udc, the other end of the inductor Ldc is respectively connected with the source electrode of the switching tube Q4 and the anode of a diode VD2, the cathode of the diode VD2 is connected with the source electrode of a switching tube Q2, the drain electrode of the switching tube Q2 is connected with the source electrode of a switching tube Q1, the drain electrode of the switching tube Q1 is connected with the anode of the diode VD1, and the two ends of a capacitor C1 are respectively connected with the source electrode of the switching tube Q1 and the negative electrode of the input power supply Udc; one end of the inductor L1 is connected to the source of the switching tube Q1, the other end of the inductor L1 is connected to one end of the impedance Z, and the other end of the impedance Z is connected to the negative electrode of the input power source Udc.
The switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4 and the switching tube Q5 all adopt power MOS tubes with the model number of IPB60R190P 6.
Wherein the diode VD1, the diode VD2 and the diode VD3 all adopt a silicon carbide Schottky diode C4D 02120E.
The utility model has the advantages that:
the utility model discloses a nonlinear pulse width modulation makes to be linear relation between output voltage and the sinusoidal modulation ripples, is applicable to the occasion of wide range voltage input.
Drawings
Fig. 1 is a circuit diagram of an inverter circuit based on a Buck-Boost converter of the present invention.
Fig. 2 is a waveform diagram of the modulation method of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, an inverter circuit based on a Buck-Boost converter includes an input power source Udc, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a switching tube Q5, a diode VD1, a diode VD2, a diode VD3, a capacitor C1, an impedance Z, an inductor L1 and an inductor Ldc;
the positive electrode of the power supply Udc is connected with the source electrode of a switching tube Q5, the drain electrode of the switching tube Q5 is respectively connected with the drain electrode of a switching tube Q3, one end of an inductor Ldc and the cathode of a diode VD1, the source electrode of the switching tube Q3 is connected with the cathode of a diode VD3, the anode of a diode VD3 and the drain electrode of a switching tube Q4 are both connected with the negative electrode of an input power Udc, the other end of the inductor Ldc is respectively connected with the source electrode of the switching tube Q4 and the anode of a diode VD2, the cathode of the diode VD2 is connected with the source electrode of a switching tube Q2, the drain electrode of the switching tube Q2 is connected with the source electrode of a switching tube Q1, the drain electrode of the switching tube Q1 is connected with the anode of the diode VD1, and the two ends of a capacitor C1 are respectively connected with the source electrode of the switching tube Q1 and the negative electrode of the input power supply Udc; one end of the inductor L1 is connected to the source of the switching tube Q1, the other end of the inductor L1 is connected to one end of the impedance Z, and the other end of the impedance Z is connected to the negative electrode of the input power source Udc.
Specifically, the Buck-Boost converter-based inverter circuit of the embodiment has four working states, and when the output of the inverter is in a positive half cycle, the inverter circuit works in a first state or a second state; when the output of the inverter is in the negative half cycle, it operates in state three or state four.
The working state I is as follows: the switching tubes Q4 and Q5 are conducted to form a current loop of the photovoltaic direct current input Udc-Q5-Ldc-Q4-Udc. At this time, the inductor Ldc is charged and the current iLThe linear rise is performed, and the capacitor C1, the inductor L1 and the load form an output loop.
And a second working state: the switching tubes Q2 and Q3 are conducted, the energy stored in the inductor Ldc supplies power to the load, and the power supply current loop is a node n-VD2-Q2-L1-Z-VD 3-Q3-m-Ldc-n.
And a third working state: the switching tubes Q4 and Q5 are conducted to form a current loop of the input Udc-Q5-Ldc-Q4-Udc. When the state 2 is finished, the direction of the output voltage changes, and the capacitor C1 discharges reversely, and forms a loop with the inductor L1 and the load, so as to maintain the stability of the output.
And the working state is four: the switching tubes Q1 and Q4 are conducted to form a loop of a node n-Q4-L1-Q1-VD 1-m-Ldc-n, and the inductor Ldc supplies power to a load.
In this embodiment, nonlinear pulse width modulation is adopted, so that a linear relationship is formed between the output voltage and the sinusoidal modulation wave, and the method is suitable for occasions with wide-range voltage input.
Referring to fig. 2, a modulation mode of the inverter circuit designed in the present embodiment is shown. Due to the adoption of the Buck-Boost topology, the Buck-Boost topology has the Buck-Boost capability. Let the switching period be T, the duty ratio be D, and the output voltage be uoThe peak value of the output voltage is UMThe gain of the inverter is M, then
According to the area equivalent principle, neglecting high frequency harmonic wave, the actual modulation wave is the absolute value of sine wave, then
d(t)＝|m sin(ωt)|
By adopting SPWM strategy, the system gain is
When the modulation ratio m is 0.5, the gain is 1; when m is greater than 0.5, the voltage is boosted and inverted; when m is less than 0.5, the inversion is pressure reduction. As can be seen from fig. 2, the switching tube Q4 and the switching tube Q5 do not have complete complementary operations at high frequency, so that no additional dead space is required. When the inverter operates at a unit power factor, a superimposed current signal does not need to be added, because when the polarity of the output voltage is changed, the voltage and the current simultaneously pass through zero, the short-circuit protection of the inverter is realized, and the output waveform basically cannot be distorted.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.
Claims (3)
1. The utility model provides an inverter circuit based on Buck-Boost converter which characterized in that: the power supply comprises an input power supply Udc, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a switching tube Q5, a diode VD1, a diode VD2, a diode VD3, a capacitor C1, an impedance Z, an inductor L1 and an inductor Ldc;
the positive electrode of the power supply Udc is connected with the source electrode of a switching tube Q5, the drain electrode of the switching tube Q5 is respectively connected with the drain electrode of a switching tube Q3, one end of an inductor Ldc and the cathode of a diode VD1, the source electrode of the switching tube Q3 is connected with the cathode of a diode VD3, the anode of a diode VD3 and the drain electrode of a switching tube Q4 are both connected with the negative electrode of an input power Udc, the other end of the inductor Ldc is respectively connected with the source electrode of the switching tube Q4 and the anode of a diode VD2, the cathode of the diode VD2 is connected with the source electrode of a switching tube Q2, the drain electrode of the switching tube Q2 is connected with the source electrode of a switching tube Q1, the drain electrode of the switching tube Q1 is connected with the anode of the diode VD1, and the two ends of a capacitor C1 are respectively connected with the source electrode of the switching tube Q1 and the negative electrode of the input power supply Udc; one end of the inductor L1 is connected to the source of the switching tube Q1, the other end of the inductor L1 is connected to one end of the impedance Z, and the other end of the impedance Z is connected to the negative electrode of the input power source Udc.
2. The Buck-Boost converter based inverter circuit according to claim 1, wherein: the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4 and the switching tube Q5 all adopt power MOS tubes with the model number of IPB60R190P 6.
3. The Buck-Boost converter based inverter circuit according to claim 1, wherein: the diode VD1, the diode VD2 and the diode VD3 all adopt a silicon carbide Schottky diode C4D 02120E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121136146.0U CN214900688U (en) | 2021-05-25 | 2021-05-25 | Inverter circuit based on Buck-Boost converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121136146.0U CN214900688U (en) | 2021-05-25 | 2021-05-25 | Inverter circuit based on Buck-Boost converter |
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| CN214900688U true CN214900688U (en) | 2021-11-26 |
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| CN202121136146.0U Active CN214900688U (en) | 2021-05-25 | 2021-05-25 | Inverter circuit based on Buck-Boost converter |
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2021
- 2021-05-25 CN CN202121136146.0U patent/CN214900688U/en active Active
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