CN210273869U - Inverter, preceding stage circuit thereof and electric appliance - Google Patents
Inverter, preceding stage circuit thereof and electric appliance Download PDFInfo
- Publication number
- CN210273869U CN210273869U CN201921682719.2U CN201921682719U CN210273869U CN 210273869 U CN210273869 U CN 210273869U CN 201921682719 U CN201921682719 U CN 201921682719U CN 210273869 U CN210273869 U CN 210273869U
- Authority
- CN
- China
- Prior art keywords
- diode
- inductor
- inverter
- positive electrode
- negative electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides an inverter and preceding stage circuit and electrical apparatus thereof relates to the electronic circuit field. The inverter with the single-stage structure can realize the regulation of voltage through the pre-stage circuit with a set structure. In addition, the inverter can realize the boosting of any multiple by reasonably setting the direct connection occupation ratio information of the inverter bridge. In addition, through the arrangement of the preceding stage circuit structure and the energy storage element thereof, the upper bridge arm and the lower bridge arm of the inverter can be directly communicated without inserting dead time, the output waveform is improved, and the output voltage quality is improved.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and in particular, to an inverter, a preceding stage circuit thereof, and an electric appliance.
Background
An inverter is a device that converts direct current into alternating current. In one of the voltage-type inverters, if the voltage-type inverter is applied to an occasion with a large variation of an input voltage range, a DC/DC (direct current to direct current) converter needs to be added to a previous stage, and a multistage structure causes a reduction in transmission efficiency of a system and an increase in cost.
In addition, the voltage-type inverter does not allow the upper and lower arms to be simultaneously conducted, otherwise, short circuit occurs, and the inverter is damaged, so that dead time needs to be added to the switching signals of the upper and lower arms (namely, the upper and lower arms are simultaneously turned off), but the addition of the dead time can cause distortion of an output waveform.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one of the above problems of the voltage-type inverter, the present disclosure enables the single-stage inverter to regulate the voltage by a pre-stage circuit of a set structure. In addition, the inverter can realize the boosting of any multiple by reasonably setting the direct connection occupation ratio information of the inverter bridge. In addition, through the arrangement of the preceding stage circuit structure and the energy storage element thereof, the upper bridge arm and the lower bridge arm of the inverter can be directly communicated without inserting dead time, the output waveform is improved, and the output voltage quality is improved.
According to an aspect of the present disclosure, there is provided an inverter including: a preceding stage circuit and an inverter bridge;
the preceding stage circuit includes: the circuit comprises a switching tube, a first inductor, a second inductor, an energy storage capacitor, a first diode, a second diode, a third diode, a fourth diode and a fifth diode;
the positive electrode of the first diode is connected with the first end of the first inductor, the negative electrode of the first diode is connected with the first end of the second inductor, the positive electrode of the second diode is connected with the second end of the first inductor, the negative electrode of the second diode is connected with the second end of the second inductor, the positive electrode of the third diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the negative electrode of the first diode, the positive electrode of the switching tube is connected with the negative electrode of the second diode and the positive electrode of the fourth diode, the negative electrode of the switching tube is connected with the positive electrode of the fifth diode, two ends of the energy storage capacitor are respectively connected with the negative electrode of the fourth diode and the negative electrode of the switching tube, the positive electrode of the first diode is connected with the positive electrode of the direct-current input power supply, the negative electrode of the fifth diode is connected with the positive electrode of the direct-current input power supply, and the negative electrodes of the.
In some embodiments, when the inverter bridge operates in a through state, the inverter bridge is short-circuited, the switching tube, the first diode and the second diode are turned on, the third diode, the fourth diode and the fifth diode are turned off, the first inductor and the second inductor are connected in parallel and store energy, and the energy storage capacitor and the direct-current input power supply release energy to the first inductor and the second inductor.
In some embodiments, when the inverter bridge operates in the non-pass-through state, the inverter bridge is equivalent to a voltage source, the switching tube, the first diode and the second diode are turned off, the third diode, the fourth diode and the fifth diode are turned on, the first inductor and the second inductor are connected in series, the first inductor, the second inductor and the direct current input power supply release energy to the energy storage capacitor and the inverter bridge, and the energy storage capacitor stores the energy.
In some embodiments, the two ends of the inverter bridge are respectively connected with the positive pole and the negative pole of the direct current bus.
In some embodiments, the switching tube is an active device.
In some embodiments, the inverter bridge is a three-phase inverter bridge.
In some embodiments, the boost factor of the output voltage across the inverter bridge relative to the dc input voltage is:
wherein B represents the output voltage V at two ends of the inverter bridgepNWith respect to the DC input voltage VinD represents duty ratio information of a time that the inverter bridge is in the through state within one switching period, D is configured to be greater than 0 and less than 1/3 such that B is greater than 1.
According to an aspect of the present disclosure, there is provided a front stage circuit including:
the circuit comprises a switching tube, a first inductor, a second inductor, an energy storage capacitor, a first diode, a second diode, a third diode, a fourth diode and a fifth diode;
the positive electrode of the first diode is connected with the first end of the first inductor, the negative electrode of the first diode is connected with the first end of the second inductor, the positive electrode of the second diode is connected with the second end of the first inductor, the negative electrode of the second diode is connected with the second end of the second inductor, the positive electrode of the third diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the negative electrode of the first diode, the positive electrode of the switching tube is connected with the negative electrode of the second diode and the positive electrode of the fourth diode, the negative electrode of the switching tube is connected with the positive electrode of the fifth diode, two ends of the energy storage capacitor are respectively connected with the negative electrode of the fourth diode and the negative electrode of the switching tube, the positive electrode of the first diode is connected with the positive electrode of the direct-current input power supply, and the negative electrode of the fifth diode is.
In some embodiments, in the first operating state, the switching tube, the first diode and the second diode are turned on, the third diode, the fourth diode and the fifth diode are turned off, the first inductor and the second inductor are connected in parallel and store energy, and the energy storage capacitor and the dc input power supply release energy to the first inductor and the second inductor.
In some embodiments, in the second operating state, the switching tube, the first diode and the second diode are turned off, the third diode, the fourth diode and the fifth diode are turned on, the first inductor and the second inductor are connected in series, the first inductor, the second inductor and the dc input power supply release energy to the energy storage capacitor and the inverter bridge, and the energy storage capacitor stores energy.
According to an aspect of the present disclosure, an electrical appliance is provided, comprising: the inverter of any of the preceding embodiments, or the pre-stage circuit of any of the preceding embodiments.
Drawings
The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description, which proceeds with reference to the accompanying drawings,
it is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 is a schematic diagram of a boost system implemented based on an inverter in some embodiments of the present disclosure.
Fig. 2 is a schematic diagram of a boosting system implemented based on an inverter according to other embodiments of the present disclosure.
Fig. 3 is a schematic diagram illustrating operation of an inverter in a pass-through state in some embodiments of the present disclosure.
Fig. 4 is a schematic diagram illustrating operation of an inverter in a non-pass state in some embodiments of the present disclosure.
Fig. 5 is a flow diagram of an inverter-based boost control method in some embodiments of the present disclosure.
Fig. 6 is a schematic diagram of an inverter-based boost control apparatus in some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
Fig. 1 is a schematic diagram of a boost system implemented based on an inverter in some embodiments of the present disclosure.
Fig. 2 is a schematic diagram of a boosting system implemented based on an inverter according to other embodiments of the present disclosure.
As shown in fig. 1 and 2, the booster system of the embodiment includes: the front-stage circuit 11 and the inverter bridge 12 may further include a dc input power supply 13 and a load (e.g., a motor load) 14. The front-stage circuit 11 and the inverter bridge 12 constitute an inverter.
As shown in fig. 1 and 2, the inverter bridge 12 may be composed of, for example, an upper and a lower bridge arm, in which a three-phase inverter bridge is exemplarily shown, wherein S1、S3、S5Are all upper bridge arms, S2、S4、S6Are all lower bridge arms.
As shown in fig. 2, the front-stage circuit 11 includes: switch tube S0A first inductor L1A second inductor L2And an energy storage capacitor C1A first diode D1A second diode D2A third diode D3A fourth diode DaAnd a fifth diode Db。
First diode D1Is connected with the first inductor L1A first terminal of (1), a first diode D1Negative pole of the first inductor L is connected with the second inductor L2A first terminal of a second diode D2Is connected with the first inductor L1A second terminal of the second diode D2Negative pole of the first inductor L is connected with the second inductor L2A second terminal of (D), a third diode D3Is connected with a second diode D2Anode of (2), third diode D3Is connected with a first diode D1Negative electrode of (2), switching tube S0Is connected with a second diode D2Negative pole of (2) and a fourth diode DaPositive electrode of (2), switching tube S0Negative pole of the first diode D is connected with the fifth diode DbPositive electrode of (2), energy storage capacitor C1Are respectively connected with a fourth diode DaNegative electrode of (2) and switching tube S0Negative electrode of (1), first diode D1Is connected to the positive pole of the dc input power supply 13, and a fifth diode DbIs connected to the positive pole of the direct current input power supply 13, and a fourth diode DaAnd the negative electrode of the dc input power supply 13 is connected to both ends of the inverter bridge, respectively.
In some embodiments, the switch tube S0Is an active device. Examples of the switching tube include an NPN Transistor, an IGBT (Insulated Gate Bipolar Transistor), and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).
In some embodiments, as shown in fig. 3, when the inverter operates in the through state, i.e., when the inverter bridge 12 operates in the through state (i.e., the upper and lower legs are both conducting), the inverter bridge 12 is short-circuited because the upper and lower legs are both conducting, and the front stage circuit is in the first operating state,switch tube S0A first diode D1And a second diode D2Conducting, the third diode D3A fourth diode DaAnd a fifth diode DbCut-off, first inductance L1And a second inductance L2Parallel connected energy storage capacitor C1And a DC input power supply 13 to the first inductor L1And a second inductance L2Release energy, first inductance L1And a second inductance L2Energy is stored.
In some embodiments, as shown in fig. 4, when the inverter operates in the non-through state, that is, when the inverter bridge 12 operates in the non-through state (i.e., one of the upper arm and the lower arm is turned on and the other is turned off), the inverter bridge 12 is equivalent to a voltage source, and when the front-stage circuit is in the second operating state, the switching tube S is in the second operating state0A first diode D1And a second diode D2Off, the third diode D3A fourth diode DaAnd a fifth diode DbConducting the first inductor L1And a second inductance L2In series, a first inductance L1A second inductor L2And a DC input power supply 13 to an energy storage capacitor C1The inverter bridge 12 releases energy and the energy storage capacitor C1Energy is stored.
In FIGS. 3-4, VinIndicates the voltage of the DC input power supply 13 (DC input voltage for short), VPNRepresenting the output voltage at two ends of the inverter bridge, if the two ends of the inverter bridge are respectively connected with the anode and the cathode of the DC bus, VPNAlso indicates the DC bus voltage, VC1And iCRepresenting an energy storage capacitor C1Voltage and current of VL1And iL1Represents the first inductance L1Voltage and current of VL2And iL2Represents the second inductance L2Voltage and current.
And setting the time of the inverter bridge in the through state within one switching period T as T1, and setting the through duty ratio D as T1/T.
From the volt-second equilibrium principle, and in conjunction with FIGS. 3-4, it can be derived that:
thus, there were obtained:
the capacitor has small voltage, and is favorable for improving the reliability of the device.
From Kirchhoff's Voltage Law (KVL), in conjunction with fig. 3-4, it can be derived that:
VPN＝VC1+Vin
the above formula yields:
wherein B represents the output voltage V at two ends of the inverter bridgePNWith respect to the DC input voltage VinD represents the duty ratio information of the time the inverter bridge is in the through state during one switching cycle. In boost applications, when D is configured to be greater than 0 and less than 1/3, B is greater than 1, i.e., any multiple of boost can theoretically be achieved. For example, when D is 1/4, B is 3, achieving a 3-fold boost.
In some embodiments, an appliance includes: the inverter of any of the foregoing embodiments, or the preceding stage circuit for an inverter of any of the foregoing embodiments. The electric appliance is, for example, an air conditioner, etc., but is not limited to the illustrated example.
Fig. 5 is a flow diagram of an inverter-based boost control method in some embodiments of the present disclosure. The method may be performed by a boost control device, for example.
As shown in fig. 5, the boost control method of the embodiment includes, in each switching cycle:
step S51, a first control signal and a conduction control signal are sent to an inverter bridge and a switch tube in the inverter respectively, the first control signal controls the inverter bridge to work in a direct-connection state, the conduction control signal controls the switch tube to conduct, so that a first diode and a second diode are conducted, a third diode, a fourth diode and a fifth diode are cut off, a first inductor and a second inductor are connected in parallel and store energy, and an energy storage capacitor and a direct current input power supply release energy to the first inductor and the second inductor.
And step S52, a second control signal and a cut-off control signal are sent to the inverter bridge and the switching tube respectively, the second control signal controls the inverter bridge to work in a non-direct-connection state, the cut-off control signal controls the switching tube to be cut off, so that the first diode and the second diode are cut off, the third diode, the fourth diode and the fifth diode are conducted, the first inductor and the second inductor are connected in series, the first inductor, the second inductor and the direct current input power supply release energy to the energy storage capacitor and the inverter bridge, and the energy storage capacitor stores the energy.
In some embodiments, the transmission timings of the first control signal and the second control signal are determined according to the duty ratio information of the time when the inverter bridge is in the through state in one switching period. For example, if the through duty ratio D of the inverter bridge is configured to 1/4, the first control signal and the on control signal are transmitted at the beginning of one switching cycle, and the second control signal and the off control signal are transmitted at 1/4 of one switching cycle.
In a boost application, the duty ratio information is configured to be greater than 0 and less than 1/3 such that the boost factor is greater than 1, thereby achieving an arbitrary multiple of boost.
Fig. 6 is a schematic diagram of an inverter-based boost control apparatus in some embodiments of the present disclosure.
As shown in fig. 6, the boost control device of the embodiment includes:
a memory 61; and
a processor 62 coupled to the memory, the processor 62 configured to execute the boost control method of any of the previous embodiments based on instructions stored in the memory 61.
The memory 61 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
The embodiment of the disclosure enables the inverter with a single-stage structure to realize voltage regulation through a pre-stage circuit with a set structure. In addition, the inverter can realize the boosting of any multiple by reasonably setting the direct connection occupation ratio information of the inverter bridge. In addition, through the arrangement of the preceding stage circuit structure and the energy storage element thereof, the upper bridge arm and the lower bridge arm of the inverter can be directly communicated without inserting dead time, the output waveform is improved, and the output voltage quality is improved.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (9)
1. An inverter, comprising: a preceding stage circuit and an inverter bridge;
the preceding stage circuit includes: the circuit comprises a switching tube, a first inductor, a second inductor, an energy storage capacitor, a first diode, a second diode, a third diode, a fourth diode and a fifth diode;
the positive electrode of the first diode is connected with the first end of the first inductor, the negative electrode of the first diode is connected with the first end of the second inductor, the positive electrode of the second diode is connected with the second end of the first inductor, the negative electrode of the second diode is connected with the second end of the second inductor, the positive electrode of the third diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the negative electrode of the first diode, the positive electrode of the switching tube is connected with the negative electrode of the second diode and the positive electrode of the fourth diode, the negative electrode of the switching tube is connected with the positive electrode of the fifth diode, two ends of the energy storage capacitor are respectively connected with the negative electrode of the fourth diode and the negative electrode of the switching tube, the positive electrode of the first diode is connected with the positive electrode of the direct-current input power supply, the negative electrode of the fifth diode is connected with the positive electrode of the direct-current input power supply, and the negative electrodes of the.
2. The inverter of claim 1,
when the inverter bridge works in a direct-connection state, the inverter bridge is in a short circuit, the switch tube, the first diode and the second diode are conducted, the third diode, the fourth diode and the fifth diode are cut off, the first inductor and the second inductor are connected in parallel and store energy, and the energy storage capacitor and the direct-current input power supply release energy to the first inductor and the second inductor.
3. The inverter of claim 1,
when the inverter bridge works in a non-direct-through state, the inverter bridge is equivalent to a voltage source, the switch tube, the first diode and the second diode are cut off, the third diode, the fourth diode and the fifth diode are conducted, the first inductor and the second inductor are connected in series, the first inductor, the second inductor and the direct current input power supply release energy to the energy storage capacitor and the inverter bridge, and the energy storage capacitor stores the energy.
4. The inverter according to claim 1, wherein the inverter bridge has two ends connected to the positive and negative poles of the dc bus, respectively.
5. The inverter according to any one of claims 1 to 4,
the switch tube is an active device;
or, the inverter bridge is a three-phase inverter bridge.
6. The inverter according to any one of claims 1 to 4,
the boost factor of the output voltage at two ends of the inverter bridge relative to the direct-current input voltage is as follows:
wherein B represents the output voltage V at two ends of the inverter bridgePNWith respect to the DC input voltage VinD represents duty ratio information of a time that the inverter bridge is in the through state within one switching period, D is configured to be greater than 0 and less than 1/3 such that B is greater than 1.
7. A front-end circuit, comprising:
the circuit comprises a switching tube, a first inductor, a second inductor, an energy storage capacitor, a first diode, a second diode, a third diode, a fourth diode and a fifth diode;
the positive electrode of the first diode is connected with the first end of the first inductor, the negative electrode of the first diode is connected with the first end of the second inductor, the positive electrode of the second diode is connected with the second end of the first inductor, the negative electrode of the second diode is connected with the second end of the second inductor, the positive electrode of the third diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the negative electrode of the first diode, the positive electrode of the switching tube is connected with the negative electrode of the second diode and the positive electrode of the fourth diode, the negative electrode of the switching tube is connected with the positive electrode of the fifth diode, two ends of the energy storage capacitor are respectively connected with the negative electrode of the fourth diode and the negative electrode of the switching tube, the positive electrode of the first diode is connected with the positive electrode of the direct-current input power supply, and the negative electrode of the fifth diode is.
8. The previous stage circuit of claim 7, wherein,
in a first working state, the switch tube, the first diode and the second diode are conducted, the third diode, the fourth diode and the fifth diode are cut off, the first inductor and the second inductor are connected in parallel and store energy, and the energy storage capacitor and the direct-current input power supply release energy to the first inductor and the second inductor;
or in a second working state, the switching tube, the first diode and the second diode are cut off, the third diode, the fourth diode and the fifth diode are conducted, the first inductor and the second inductor are connected in series, the first inductor, the second inductor and the direct current input power supply release energy to the energy storage capacitor, and the energy storage capacitor stores the energy.
9. An electrical appliance, comprising: the inverter of any one of claims 1 to 6, or the pre-stage circuit of any one of claims 7 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921682719.2U CN210273869U (en) | 2019-10-08 | 2019-10-08 | Inverter, preceding stage circuit thereof and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921682719.2U CN210273869U (en) | 2019-10-08 | 2019-10-08 | Inverter, preceding stage circuit thereof and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210273869U true CN210273869U (en) | 2020-04-07 |
Family
ID=70020086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921682719.2U Active CN210273869U (en) | 2019-10-08 | 2019-10-08 | Inverter, preceding stage circuit thereof and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210273869U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111355397A (en) * | 2020-04-17 | 2020-06-30 | 南通大学 | Single-phase high-gain photovoltaic grid-connected inverter with continuous input current and control method |
-
2019
- 2019-10-08 CN CN201921682719.2U patent/CN210273869U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111355397A (en) * | 2020-04-17 | 2020-06-30 | 南通大学 | Single-phase high-gain photovoltaic grid-connected inverter with continuous input current and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212969479U (en) | Heric inverter circuit and Heric inverter | |
| US20120019230A1 (en) | Dc/dc converter circuit and method for controlling a dc/dc converter circuit | |
| CN103259442B (en) | A kind of High-gain current type inverter | |
| CN103095134A (en) | Active network boost converter | |
| EP2698911A1 (en) | Power electronic circuit | |
| CN103391001A (en) | High-gain DCDC converter for MPPT link of photovoltaic inverter | |
| EP3324707B1 (en) | Isolated single-ended primary inductor converter with voltage clamp circuit | |
| CN210273869U (en) | Inverter, preceding stage circuit thereof and electric appliance | |
| US11165359B2 (en) | Power conversion system configured to perform power conversion between direct current and three-phase alternating current | |
| CN214544101U (en) | Bootstrap driving circuit, voltage conversion circuit and energy storage equipment | |
| EP2662966A1 (en) | Three-level inverter | |
| CN104052271A (en) | Z-source high-gain direct current boost converter | |
| CN106972751B (en) | Double-tube Z-source direct-current voltage converter | |
| CN217087507U (en) | Switching power supply circuit capable of restraining surge current and switching power supply | |
| CN110601581A (en) | Intelligent power module, electric control device and air conditioner | |
| CN212909346U (en) | Boost power conversion circuit | |
| CN114665735A (en) | ANPC three-level inverter topology circuit, control method and control device | |
| CN107248816A (en) | A kind of new converter circuit based on traditional Buck Boost topologys | |
| CN109861573B (en) | Low switching loss power inverter | |
| CN109713896B (en) | High-gain boost converter with inverse square characteristic and control method thereof | |
| CN110518823A (en) | Inverter and its boost control method and control device and front stage circuits and electric appliance | |
| CN109245584B (en) | High-energy-efficiency dual-input inverter suitable for distributed photovoltaic grid-connected system | |
| CN209001832U (en) | The BOOST booster circuit of resisting radiation interference | |
| CN113659822B (en) | Method for reducing loss of soft switching power converter based on saturated inductance | |
| CN216312975U (en) | Preceding stage circuit, boost error-proofing inverter and electric appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |