CN102751893A - Inverter circuit - Google Patents
Inverter circuit Download PDFInfo
- Publication number
- CN102751893A CN102751893A CN2012102208151A CN201210220815A CN102751893A CN 102751893 A CN102751893 A CN 102751893A CN 2012102208151 A CN2012102208151 A CN 2012102208151A CN 201210220815 A CN201210220815 A CN 201210220815A CN 102751893 A CN102751893 A CN 102751893A
- Authority
- CN
- China
- Prior art keywords
- inductance
- links
- switching tube
- output
- inverter circuit
- 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.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention relates to an inverter circuit and an inversion method thereof. The inverter circuit comprises a charging capacitor, a first switch tube, a first inductor, a second inductor, a second switch tube, a third switch tube and a filter capacitor, wherein the first inductor and the second inductor are tightly coupled with each other; the first switch tube is connected between the positive terminal of the first charge capacitor and the input terminal of the first inductor; the input terminal of the second inductor is connected with the output terminal of the first inductor, and the output terminal of the second inductor is connected with the negative terminal of the charge capacitor; one terminal of a series branch between the second switch tube and the third switch tube are connected with the input terminal of the first inductor, and the other terminal of the series branch is connected with the output terminal of the second inductor; and one terminal of the filter capacitor is connected with the output terminal of the first inductor, and the other terminal of the filter capacitor is connected with a connection point between the second switch tube and the third switch tube. The inverter circuit provided by the invention adopts the inductors which are tightly coupled with each other, so that an output voltage can be higher or lower than an input voltage by only regulating duty ratio D.
Description
Technical field
The present invention relates to inverter circuit.
Background technology
Existing tri-level inversion topology has following shortcoming: 1. control is complicated, needs the PWM ripple to remove to control four switching tubes.2. the sine wave of output is slower than the sine wave reaction of the topological output of two level inverse conversions.The rate of descent of electric current is relevant with the voltage of inductance in the inductance, i.e. U=L*di/dt.The continuous current circuit of two level inverse conversions topology is to carry out afterflow through the loop that includes filter capacitor and charging capacitor, and the inductance voltage is the voltage that the instant voltage of filter capacitor adds the charging capacitor two ends, and current changing rate di/dt is bigger.And the continuous current circuit of tri-level inversion topology is only through filter capacitor, the obstructed electric capacity that overcharges, so the inductance voltage is the instant voltage of filter capacitor, current changing rate di/dt is than topological little of two level inverse conversions, and reaction is slowly.3. its voltage of also requiring to import will be higher than the voltage of output, could guarantee the waveform of output.
Summary of the invention
Main purpose of the present invention provides a kind of inverter circuit that has the advantage of two level inverse conversion topological sum tri-level inversions topology simultaneously.
A kind of inverter circuit, comprise charging capacitor, first switching tube, first inductance, with closely-coupled second inductance of said first inductance, second switch pipe and the 3rd switching tube and filter capacitor; Said first switching tube is connected between the input of the first charging capacitor anode and first inductance; The input of said second inductance links to each other with the output of first inductance, and its output links to each other with the charging capacitor negative terminal; One end of the series arm of said second switch Guan Yudi three switching tubes links to each other with the input of said first inductance, and its other end links to each other with the output of said second inductance; One end of said filter capacitor links to each other with the output of said first inductance, and its other end links to each other with the tie point of said second switch pipe and the 3rd switching tube.
Said second switch Guan Yudi three switching tubes are unidirectional actuating switch, and second switch Guan Yudi three switching tubes are connected in series, and the negative terminal of second switch pipe links to each other with the input of said first inductance, and the anode of the 3rd switching tube links to each other with the output of said second inductance.
Said second switch Guan Yudi three switching tubes are thyristor SCR.
Said second switch pipe also can be the 2nd IGBT and second diode that is in series, and the collector electrode of said the 2nd IGBT links to each other with filter capacitor second end, and emitter links to each other with the anode of second diode, and the negative electrode of second diode links to each other with the first inductance input; Said the 3rd switching tube is the 3rd IGBT and the 3rd diode that is in series, and the collector electrode of said the 3rd IGBT links to each other with the negative electrode of the 3rd diode, and emitter links to each other with filter capacitor second end, and the anode of said the 3rd diode links to each other with second inductance output end.
An improvement as circuit of the present invention: said first inductance is identical with the characteristic of second inductance.
Said first switching tube is an IGBT, and its collector electrode links to each other with the charging capacitor anode, and its emitter links to each other with the input of first inductance.
As another improvement of the present invention: also comprise the 4th switching tube between the output that is connected on the charging capacitor negative terminal and second inductance in the circuit.
Said the 4th switching tube is the 4th IGBT, and its collector electrode links to each other with the output of second inductance, and its emitter links to each other with the charging capacitor negative terminal.
Circuit of the present invention has adopted closely-coupled inductance, and as long as like this through regulating duty ratio D, the voltage that just can make output promptly can be than the input voltage height, also can be lower than input voltage.Therefore only need lower Vbus voltage, just can obtain the output voltage that we hope.The circuit reaction is fast, and distortion is few.Because Vbus voltage is lower, make the device that the Vbus side is relevant: the requirement of withstand voltage of electric capacity and switching tube can reduce, and can use withstand voltage lower general-purpose device, is particularly suitable for the higher converter of output voltage, has practiced thrift cost.
Description of drawings
Fig. 1 is a kind of inverter circuit schematic diagram of the present invention.
Fig. 2 is the circuit theory diagrams of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done to set forth further.
As shown in Figure 1, circuit of the present invention comprise charging capacitor C1, the first switching tube S1, the first inductance L 1-1, with the 3rd switching tube S3 and the filter capacitor C of the closely-coupled second inductance L 1-2 of the said first inductance L 1-1, the second switch pipe S2 of unidirectional conducting, unidirectional conducting; The said first switching tube S1 is connected between the input of the charging capacitor C1 anode and the first inductance L 1-1; The input of the said second inductance L 1-2 links to each other with the output of the first inductance L 1-1, and its output links to each other with charging capacitor C1 negative terminal; Said second switch pipe S2 and the 3rd switching tube S3 are connected in series, and the negative terminal of second switch pipe S2 links to each other with the input of the said first inductance L 1-1, and the anode of the 3rd switching tube S3 links to each other with the output of the said second inductance L 1-2; The end of said filter capacitor C links to each other with the output of the said first inductance L 1-1, and its other end links to each other with the tie point of said second switch pipe S2 and the 3rd switching tube S3.
In the circuit of the present invention, the said first inductance L 1-1 is identical with the characteristic of the second inductance L 1-2.
Its circuit working principle is following:
When producing sinusoidal wave positive half cycle: the first switching tube S1 is closed; Second switch pipe S2 and the 3rd switching tube S3 break off; Voltage between Vbus+ and the Vbus-is added on the first inductance L 1-1 and the second inductance L 1-2; Energy on the charging capacitor C1 is gone up transfer to the filtering first inductance L 1-1 and the second inductance L 1-2, and inductive current rises gradually, inductive energy storage.The recruitment of said inductive current is:
Vin*D*T/2L1，
Wherein D is Ton/T, i.e. the duty ratio of switch conduction, and L1 is the inductance value of first inductance, T is the cycle.After a period of time, break off the first switching tube S1, while closed second switch pipe S2 (the 3rd switching tube S3 keeps breaking off), the energy storage on first inductance is to filter capacitor C charging, and inductive current descends, and the reduction of inductive current is:
Vout*(1-D)*T/L1，
Wherein Vout is the voltage on the inductance.Because the first inductance L 1-1 and the second inductance L 1-2 are closely-coupled inductance,, the energy of the second inductance L 1-2 upward charges to filter capacitor C so can transferring to the first inductance L 1-1.Therefore the voltage on the filter capacitor C rises gradually.During stable state, the recruitment of inductive current equals its reduction, that is:
Vin*D*T/2L1＝Vout*(1-D)*T/L1，
We can draw thus:
Vout＝Vin*D/(2*(1-D))。
In like manner; When producing sinusoidal wave negative half period, the first switching tube S1 is closed, and second switch pipe S2 and the 3rd switching tube S3 break off; Voltage between Vbus+ and the Vbus-is added on the first inductance L 1-1 and the second inductance L 1-2; Energy on the charging capacitor C1 shifts on first inductance and second inductance, and inductive current rises gradually, inductive energy storage.After a period of time, break off the first switching tube S1, simultaneously closed the 3rd switching tube S3 (second switch pipe S2 keeps breaking off), the energy storage on the second inductance L 1-2 is to filter capacitor C charging, and inductive current descends.Because the first inductance L 1-1 and the second inductance L 1-2 are closely-coupled inductance,, the energy of the first inductance L 1-1 upward carries out reverse charging to filter capacitor C so transferring to the second inductance L 1-2.Therefore the negative direction voltage on the filter capacitor C rises gradually.During stable state, can draw equally according to above-mentioned inference method:
Vout＝Vin*D/(2*(1-D))。
Can be drawn by following formula: through changing the make-and-break time of switch, the value of promptly regulating duty ratio D just can make that magnitude of voltage changes on the filter capacitor, the size of change output voltage.This just means that output voltage both can be higher than input voltage, also can be lower than input voltage.So only need lower Vbus voltage, just can obtain the output voltage that we hope.Because Uc is the integration of Ic, just can obtain the sinewave output voltage waveform that we hope on the electric capacity simultaneously.This current control mode reaction is fast, and the voltage wave shape distortion of output is little.
In one embodiment, as shown in Figure 2, the first switching tube S1 is an IGBT, and its collector electrode links to each other with charging capacitor C1 anode, and its emitter links to each other with the input of the first inductance L 1-1; Also comprise the diode of inverse parallel on a said IGBT.Second switch pipe S2 and the 3rd switching tube S3 are thyristor SCR.Other connection of this circuit is identical with Fig. 1.
In the circuit working process, when inductive energy storage discharged to filter capacitor, because close-coupled, the energy of energy first inductance of second inductance can shift mutually.
Like this, do the afterflow branch road with SCR, low frequency switches, and the first switching tube S1 is PWM and regulates.Its operation principle is identical with Fig. 1 circuit.
Circuit of the present invention has adopted closely-coupled inductance, and as long as like this through regulating duty ratio D, the voltage that just can make output promptly can be than the input voltage height, also can be lower than input voltage.Therefore only need lower Vbus voltage, just can obtain the output voltage that we hope.The circuit reaction is fast, and distortion is few.
Because Vbus voltage is lower, make the device that the Vbus side is relevant: the requirement of withstand voltage of electric capacity and switching tube can reduce, and can use withstand voltage lower general-purpose device, is particularly suitable for the higher converter of output voltage, has practiced thrift cost.
In improvement circuit of the present invention, increased by the 4th switching tube, the voltage stress of first switching tube and the 4th switching tube has been reduced half the, corresponding loss can reduce, and the efficient of inversion is improved; Make the inductive energy storage loop and the loop that releases energy definitely separate simultaneously, realized isolation.
In the control, first switching tube was only opened once in each half period, had simplified control circuit, had reduced switching loss simultaneously.Second switch pipe and the 3rd switching tube only in half cycle switch once reduced switching loss.As long as change second switch pipe and the 3rd switching tube into unidirectional switch, just can let second switch pipe and the 3rd switching tube in the control by the switch mode operation of low frequency, i.e. just half cycle second switch pipe conducting always, the conducting always of negative half period the 3rd switching tube.Because its folk prescription, can obtain the waveform of needs equally to current flowing.The switching loss of second switch pipe and the 3rd switching tube can reduce like this.
The Vbus side DC charging electrochemical capacitor because the current in middle wire of output is not flowed through so the ripple current on the electrochemical capacitor is less, can be saved the number of electric capacity.The present invention can also utilize three same circuit to form three-phase inverters, and each is single-phase all to have above effect.
The present invention can be used on the small-sized UPS, is that a kind of cost is low, the scheme that performance is good.Owing to be to utilize inductance to carry out energy storage, working method is the pattern of current source, can realize the function of parallel connection more simply, and have the function of Short Circuit withstand.As long as the inductive current during to energy storage is controlled, carry out between a plurality of inverter circuits just can realizing the direct parallel connection of inverter circuit synchronously.Bigger application prospect is arranged.
Claims (8)
1. an inverter circuit comprises charging capacitor, first switching tube, first inductance and filter capacitor, it is characterized in that: also comprise second inductance, second switch pipe and the 3rd switching tube with said first inductance coupling high; Said first switching tube is connected between the input of the charging capacitor anode and first inductance; The input of said second inductance links to each other with the output of first inductance, and its output links to each other with the charging capacitor negative terminal; One end of the series arm of said second switch Guan Yudi three switching tubes links to each other with the input of said first inductance, and its other end links to each other with the output of said second inductance; One end of said filter capacitor links to each other with the output of said first inductance, and its other end links to each other with the tie point of said second switch pipe and the 3rd switching tube.
2. inverter circuit according to claim 1; It is characterized in that: said second switch Guan Yudi three switching tubes are unidirectional actuating switch; Second switch Guan Yudi three switching tubes are connected in series; The negative terminal of second switch pipe links to each other with the input of said first inductance, and the anode of the 3rd switching tube links to each other with the output of said second inductance.
3. inverter circuit according to claim 2 is characterized in that: said second switch Guan Yudi three switching tubes are thyristor SCR.
4. inverter circuit according to claim 2; It is characterized in that: said second switch pipe is the 2nd IGBT and second diode that is in series; Said the 3rd switching tube is the 3rd IGBT and the 3rd diode that is in series; The negative electrode of said second diode links to each other with the first inductance input, and anode links to each other with the emitter of said the 2nd IGBT; The anode of said the 3rd diode links to each other with second inductance output end, and negative electrode links to each other with the collector electrode of said the 3rd IGBT, and the collector electrode of said the 2nd IGBT links to each other with the emitter of said the 3rd IGBT.
5. inverter circuit according to claim 1 is characterized in that: said first inductance is identical with the characteristic of second inductance.
6. inverter circuit according to claim 1 is characterized in that: said first switching tube is an IGBT, and its collector electrode links to each other with the charging capacitor anode, and its emitter links to each other with the input of first inductance.
7. inverter circuit according to claim 1 is characterized in that: also comprise the 4th switching tube between the output that is connected on the charging capacitor negative terminal and second inductance.
8. inverter circuit according to claim 7 is characterized in that: said the 4th switching tube is the 4th IGBT, and its collector electrode links to each other with the output of second inductance, and its emitter links to each other with the charging capacitor negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102208151A CN102751893A (en) | 2012-06-29 | 2012-06-29 | Inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102208151A CN102751893A (en) | 2012-06-29 | 2012-06-29 | Inverter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102751893A true CN102751893A (en) | 2012-10-24 |
Family
ID=47031838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102208151A Pending CN102751893A (en) | 2012-06-29 | 2012-06-29 | Inverter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102751893A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665117A (en) * | 2004-12-08 | 2005-09-07 | 力博特公司 | Inverter circuit and inverting method thereof |
| US20100118575A1 (en) * | 2007-02-16 | 2010-05-13 | Stefan Reschenauer | Power Inverter |
| US20110075455A1 (en) * | 2009-09-25 | 2011-03-31 | James Sigamani | DC-AC Inverters |
-
2012
- 2012-06-29 CN CN2012102208151A patent/CN102751893A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665117A (en) * | 2004-12-08 | 2005-09-07 | 力博特公司 | Inverter circuit and inverting method thereof |
| US20100118575A1 (en) * | 2007-02-16 | 2010-05-13 | Stefan Reschenauer | Power Inverter |
| US20110075455A1 (en) * | 2009-09-25 | 2011-03-31 | James Sigamani | DC-AC Inverters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101295925B (en) | DC/DC converting system | |
| CN106301042B (en) | A kind of seven electrical level inverters | |
| CN102510215B (en) | Three-level bidirectional direct-current converter and pulse width control method thereof | |
| CN102158072B (en) | Power inverter of parallel-connected electric bridge type impedance network | |
| CN102158071B (en) | Series-connected bridge-type impedance network power converter | |
| CN103391001B (en) | For the high-gain DC/DC converter of MPPT link of photovoltaic inverter | |
| CN105281361B (en) | A kind of five-level double step-down combining inverter | |
| CN103427657A (en) | High-voltage DC-DC conversion device | |
| CN107134937A (en) | A kind of three level multiple-pulses output transformerless inverter circuit | |
| CN101951145B (en) | Three-level Buck conversion control method of X-shaped symmetrical H bridge and implementation device thereof | |
| CN104104252A (en) | Single-stage buck-boost dual-Boost inverter and control method thereof | |
| CN103441676A (en) | Modularized device for conversion between high-voltage direct current and direct current | |
| CN206865369U (en) | Three level multiple-pulses export transformerless inverter circuit | |
| CN107332456B (en) | A kind of three-phase passive flexible switch inverter circuit | |
| CN103414338A (en) | Bi-directional DCDC transformation circuit and bi-directional DCDC transformation device | |
| CN102710133A (en) | Seven-level circuit, a grid-connected inverter and modulation method and device of seven-level circuit | |
| CN102684534A (en) | High-capacity superconducting energy storage transducer provided with H-bridge current transformer | |
| CN102185491B (en) | Serial and parallel connection electrical bridge type impedance network power converter | |
| CN102427312A (en) | Single-phase inverter | |
| CN203590033U (en) | High gain DC/DC converter applied in photovoltaic inverter MPPT link | |
| CN104811075A (en) | Control method for combined converter | |
| CN102790532A (en) | Universal switch power supply | |
| CN102710162A (en) | Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter | |
| CN103107698A (en) | Multi-level active network boost converter | |
| CN100456616C (en) | Inverter circuit and inverting method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121024 |