CN106655738B - A kind of the quasi-single-stage inverter and its control method of no electrolytic capacitor - Google Patents
A kind of the quasi-single-stage inverter and its control method of no electrolytic capacitor Download PDFInfo
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- CN106655738B CN106655738B CN201510740317.3A CN201510740317A CN106655738B CN 106655738 B CN106655738 B CN 106655738B CN 201510740317 A CN201510740317 A CN 201510740317A CN 106655738 B CN106655738 B CN 106655738B
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Abstract
The invention discloses the quasi-single-stage inverters and its control method of a kind of no electrolytic capacitor.The main circuit topology of the quasi-single-stage inverter includes DC power supply, input filter capacitor, main switch, isolating transformer, rectification circuit, filter circuit, polarity reversion inverter bridge, load and active auxiliary circuit；Its control method are as follows: auxiliary induction current sampling data extracts low frequency component by low-pass filter, subtracter, P controller is recycled to obtain auxiliary induction current-modulation wave, finally by comparator, driving circuit, to control its reference value of auxiliary induction current tracking；Auxiliary capacitor voltage sample value and load voltage sampled value are by modulating wave computing module three modulating waves of acquisition, then by comparator, logic circuit, frequency dividing circuit and driving circuit, work as required to control inverter.AC load bring power ripple is introduced active auxiliary circuit by the present invention, so not needing big electrolytic capacitor in circuit to filter out low frequency power ripple.
Description
Technical field
The present invention relates to the quasi-single-stage inverters and its control method of a kind of no electrolytic capacitor, belong to new energy electric power transformation
Ripple Suppression technical field.
Background technique
In recent years, the mankind increasingly pay attention to natural environment, cleaning, efficient, sustainable development new energy power technology
It attracts wide attention, some inverter topologies and control program about generation of electricity by new energy has occurred.For this inversion
Device, the two frequency multiplication power pulsations contained in output AC power will necessarily feedback transmission to direct current input side, to influence electric power storage
The service life of the input sources such as pond, fuel cell can interfere the stability of DC power system, therefore solve new energy when serious
Power ripple problem in electricity generation system, the utilization efficiency for improving new energy are very urgent.Although this low-frequency ripple can be with
It is filtered out with big electrolytic capacitor, but under high temperature operating conditions, frequent charge and discharge will lead to its use to electrolytic capacitor for a long time
Service life decline is not recommended to use electrolytic capacitor it is contemplated that arriving the service life and power density of inverter.It accesses in circuit
LC resonance circuit can also filter out twice of power ripple, but required by the way that resonant circuit frequency is designed as twice of output frequency
Inductance and capacitor volume it is all bigger, reduce the reliability and power density of system.To sum up, these common dependence
Passive device come the method that filters out power ripple, often all there is volumes it is big, at high cost the problems such as.For this purpose, some scholars
Other methods are being explored, power ripple can be not only being filtered out, can reduce capacitance also to use other more long-life capacitors, example
Such as thin-film capacitor.
Summary of the invention
It is an object of the invention to provide a kind of standard of no electrolytic capacitor for technological deficiency present in above-mentioned inverter
Single-stage inverter and its control method are not only able to achieve direct current input side without low using this quasi-single-stage inverter and control method
Frequency power ripple, while the bulky capacitor that this reliability of electrolytic capacitor is low, the service life is short can be cast out.
The present invention to achieve the above object, adopts the following technical scheme that
A kind of quasi-single-stage inverter of no electrolytic capacitor of the invention, including DC power supply, input filter capacitor, main switch
Pipe, isolating transformer, rectification circuit, filter circuit, polarity reversion inverter bridge and load, wherein main switch includes two switches
Pipe, isolating transformer include three windings, and the anode of DC power supply connects one end of input filter capacitor, the cathode of DC power supply,
The emitter of the other end of input filter capacitor, the emitter of the first main switch and the second main switch is connected, first around
The different name of group terminates the collector of the first main switch, the different name end of second winding of termination of the same name of the first winding, the second winding
Second main switch of termination of the same name collector, rectification circuit includes four diodes, the anode of the first rectifier diode, the
The cathode of two rectifier diodes is connected with the Same Name of Ends of the tertiary winding, the anode of third rectifier diode, the 4th two poles of rectification
The cathode of pipe is connected with the different name end of the tertiary winding, and the cathode of the first rectifier diode and third rectifier diode connects and composes
It is defeated that the anode of the positive output end of rectification circuit, the second rectifier diode and the 4th rectifier diode connects and composes bearing for rectification circuit
Outlet, filter circuit include filter inductance and filter capacitor, and it includes four switching tubes that polarity, which inverts inverter bridge, and the one of filter inductance
Terminate the positive output end of rectification circuit, the other end of filter inductance, one end of filter capacitor, the collector of first switch tube and the
The collector of three switching tubes is connected, the other end of filter capacitor, the negative output terminal of rectification circuit, second switch emitter
It is connected with the emitter of the 4th switching tube, the emitter of first switch tube is connected with the collector of second switch constitutes polarity
The positive output end of inverter bridge is inverted, the connected composition polarity reversion of the collector of the emitter of third switching tube and the 4th switching tube is inverse
Become the negative output terminal of bridge, polarity inverts one end of the positive output terminating load of inverter bridge, and polarity inverts the negative output terminal of inverter bridge
Connect the other end of load, it is characterised in that:
It further include active auxiliary circuit；Wherein active auxiliary circuit includes auxiliary induction, auxiliary capacitor, two two poles of auxiliary
Pipe and two auxiliary switches, the anode of the first booster diode connect the anode of DC power supply, the cathode of the first booster diode,
The anode of auxiliary capacitor, the collector of the second auxiliary switch, isolating transformer the first winding Same Name of Ends and isolation transformation
The different name end of second winding of device is connected, the negative terminal of auxiliary capacitor, the anode of the second booster diode and the first auxiliary switch
The emitter of pipe is connected, and the collector of the first auxiliary switch, one end of auxiliary induction are connected with the cathode of DC power supply,
The emitter of the other end of auxiliary induction, the cathode of the second booster diode and the second auxiliary switch is connected.
A kind of quasi-single-stage inverter of no electrolytic capacitor, which is characterized in that the control of the quasi-single-stage inverter
Method the following steps are included:
Step A detects auxiliary induction current signal, auxiliary capacitor voltage signal, load voltage signal；
Step B, the auxiliary induction current signal that step A is obtained pass through low-pass filter, obtain its low frequency component；
Step C calculates the difference of auxiliary induction current reference signal and auxiliary induction electric current low frequency component；
Step D, the auxiliary capacitor voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step E calculates the difference of auxiliary capacitor voltage reference signal and auxiliary capacitor voltage DC component, the electricity that will be obtained
Pressure difference is adjusted with PI controller, obtains auxiliary capacitor voltage disturbance signal；
The obtained current differential of step C is adjusted step F with P controller, and the auxiliary that step E is obtained then is added
Capacitance voltage disturbing signal obtains the modulation wave signal of quasi-single-stage inverter auxiliary induction electric current；
Step G obtains second by the modulation wave signal input comparator of aforementioned auxiliary induction electric current compared with sawtooth carrier wave
The pwm control signal of auxiliary switch；
Auxiliary capacitor voltage signal that step A is obtained, load voltage signal are inputted modulating wave respectively and calculate mould by step H
Block obtains the first, second, third modulation wave signal；
Step I, by aforementioned first, second, third modulation wave signal, input comparator obtains compared with sawtooth carrier wave respectively
First, second, third logical signal；
Step J, the load voltage signal that step A is obtained input zero-crossing comparator, obtain the 4th logical signal；
The signal of aforementioned first, second logical signal and determinating mode 1, mode 2 is distinguished input logic circuit by step K,
The signal of first logical signal and determinating mode 1 access logical AND gate, the second logical signal and determinating mode 2 in logic circuits
Signal access logical AND gate after, then access logic sum gate and obtain the pwm control signal of main switch；
Second, third aforementioned logical signal is distinguished into input logic circuit, third logical signal first passes through in logic circuits
It crosses after logic inverter and after the second logical signal accesses logical AND gate together, then access logical AND gate with the signal of determinating mode 2
Obtain the pwm control signal of the first auxiliary switch；
By aforementioned 4th logical signal input logic circuit, logic inverter is first passed through in logic circuits and obtains second,
After the pwm control signal of three switching tubes, the pwm control signal of the first, the 4th switching tube is obtained using logic inverter；
The pwm control signal input frequency dividing circuit of the obtained main switch of step K is obtained the first master respectively and opened by step L
Close the pwm control signal of pipe and the pwm control signal of the second main switch；
Step M, the second auxiliary switch pwm control signal for respectively obtaining step G, the first auxiliary that step K is obtained
The pwm control signal of the pwm control signal of switching tube and the first, second, third and fourth switching tube, step L obtain
The pwm control signal of one main switch, the second main switch pwm control signal input driving circuit obtain two main switches
The driving signal of pipe, two auxiliary switches and polarity reversion four switching tubes of inverter bridge, controls quasi-single-stage inverter.
Technical characteristics of the present invention compared with original technology are, due to increasing active auxiliary circuit, by friendship
Current load bring power ripple introduces active auxiliary circuit, and DC power supply terminal only has dc power, therefore does not need in circuit
Big electrolytic capacitor filters out low frequency power ripple.
Detailed description of the invention
Attached drawing 1 is that a kind of quasi-single-stage converter main circuit of no electrolytic capacitor of the invention and its structure of control method are shown
It is intended to.
Attached drawing 2 is a kind of quasi-single-stage inverter input-output power relation schematic diagram of no electrolytic capacitor of the invention.
3~Figure 10 of attached drawing is a kind of each switch mode schematic diagram of the quasi-single-stage inverter of no electrolytic capacitor of the invention.
Attached drawing 11 is that the present invention is applied to input current under load voltage 110V/50Hz occasion, auxiliary capacitor voltage, filtering
The simulation waveform of inductive current and load voltage.
Primary symbols title in above-mentioned attached drawing: Vin, supply voltage.Sm1、Sm2、Sx1、Sx2、S1~S4, power switch tube.
Dx1、Dx2, booster diode.Cin, input filter capacitor.Cx, auxiliary capacitor.Lx, auxiliary induction.Tr, isolating transformer.N1、N2、
N3, isolating transformer winding.D1~D4, rectifier diode.Lf, filter inductance.Cf, filter capacitor.RL, load.vx, auxiliary capacitor
Voltage.vo, load voltage.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing:
It is attached it is shown in FIG. 1 be a kind of no electrolytic capacitor quasi-single-stage converter main circuit and its structural representation of control method
Figure.The quasi-single-stage converter main circuit of no electrolytic capacitor is by DC power supply, input filter capacitor 1, main switch 2, isolation transformation
Device 3, rectification circuit 4, filter circuit 5, polarity reversion inverter bridge 6, load 7 and auxiliary circuit 8 form.Sm1、Sm2、Sx1、Sx2It is four
Power switch tube, LxIt is auxiliary induction, CxIt is auxiliary capacitor, Dx1、Dx2It is booster diode, TrIt is isolating transformer, D1~D4
It is rectifier diode, LfIt is filter inductance, CfIt is filter capacitor, S1~S4It is inverse switch pipe, RLFor load.vx, auxiliary capacitor
Voltage.vo, load voltage.
Detect auxiliary induction current signal iLx, auxiliary capacitor voltage signal vx, load voltage signal vo；By auxiliary induction electricity
Flow signal iLxBy low-pass filter, its low frequency component is obtained；Calculate auxiliary induction current reference signal iLx *With auxiliary induction electricity
Flow the difference DELTA i of low frequency componentLx；By auxiliary capacitor voltage signal vxBy low-pass filter, its DC component V is obtainedx；It calculates
Auxiliary capacitor voltage reference signal vx *With auxiliary capacitor voltage DC component VxDifference DELTA vx, the voltage difference Δ v that will obtainx
It is adjusted with PI controller, obtains auxiliary capacitor voltage disturbance signal；By current differential Δ iLxIt is adjusted with P controller,
Then auxiliary capacitor voltage disturbance signal is added, obtains the modulation wave signal M of quasi-single-stage inverter auxiliary induction electric current0；It will be auxiliary
Help the modulation wave signal M of inductive current0Input comparator obtains the PWM control of the second auxiliary switch compared with sawtooth carrier wave
Signal Qx2；By auxiliary capacitor voltage signal vx, load voltage signal voModulating wave computing module is inputted respectively, obtains the first modulation
Wave signal M1, the second modulation wave signal M2And third modulation wave signal M3；By modulation wave signal M1、M2And M3Input comparator respectively
Compared with sawtooth carrier wave, the first logical signal C is obtained1, the second logical signal C2And third logical signal C3；Load voltage is believed
Number voZero-crossing comparator is inputted, the 4th logical signal C is obtained4；By logical signal C1、C2With the signal point of determinating mode 1, mode 2
Other input logic circuit, in logic circuits logical signal C1Logical AND gate, logical signal C are accessed with the signal of determinating mode 12
After accessing logical AND gate with the signal of determinating mode 2, then accesses logic sum gate and obtain the pwm control signal Q of main switchm；It will
Logical signal C2、C3Distinguish input logic circuit, in logic circuits logical signal C3It first passes through after logic inverter and logic letter
Number C2After accessing logical AND gate together, then with the signal of determinating mode 2 access logical AND gate obtain the PWM of the first auxiliary switch
Control signal Qx1；By logical signal C4Input logic circuit first passes through logic inverter in logic circuits and obtains second, third and opens
Close the pwm control signal Q of pipe2/Q3Afterwards, the pwm control signal Q of the first, the 4th switching tube is obtained using logic inverter1/Q4；
By the pwm control signal Q of main switchmInput frequency dividing circuit obtains the pwm control signal Q of the first main switch respectivelym1With
The pwm control signal Q of two main switchesm2；Pwm control signal Qm1、Qm2、Qx1、Qx2、Q1/Q4、Q2/Q3Input driving circuit respectively
Obtain power tube Sm1、Sm2、Sx1、Sx2、S1/S4、S2/S3Driving signal, control quasi-single-stage inverter.
Concrete operating principle of the invention is described in conjunction with 2~attached drawing of attached drawing 10.Entire inverter work exists known to attached drawing 2
Under both of which.In mode 1, output power is directly provided by DC power supply, in addition to this extra DC power supply terminal input work
Rate is introduced into auxiliary circuit and is stored on auxiliary capacitor, and as shown in attached drawing 2, region A and region B are respectively indicated and exported in mode 1
Required power and extra power.In mode 2, DC power supply terminal input power passes to secondary side through isolating transformer, but should
Power needed for input power is not enough to provide output loading completely, wherein insufficient part is then by energy storage in mode 1
Auxiliary capacitor provides, and region C and region D respectively indicate the power that DC input power and auxiliary capacitor discharge in mode 2.Pass through
Output power bring power ripple is introduced active auxiliary circuit, DC power supply terminal only has dc power essentially free of low
Frequency power ripple, therefore big electrolytic capacitor is not needed in circuit to filter out low frequency power ripple.
Since auxiliary circuit assumes responsibility for the extra power of DC power supply terminal, i.e. power ripple, so auxiliary induction electric current is joined
Examine iLx *It can be by power ripple pripAnd input voltage VinIt acquires:
In formula, Vo、IoFor the amplitude of load voltage, load current.
For traditional single-phase inverter, Instantaneous input power is equal to instantaneous output power, then has:
Flow through the current average of isolating transformer primary side are as follows:
In order to realize input current IinIt is constant, it is expected that primary current is also definite value:
Then the modulating wave of main switch duty ratio may be expressed as: at this time
If the control signal of main switch is by carrier signal and modulating wave M3Compare generation, to provide constant defeated
Enter power, then power ripple needed for output AC power is transmitted by auxiliary capacitor by auxiliary switch, and auxiliary switch accounts for
The modulating wave of empty ratio may be expressed as:
The working condition of each switch mode is made a concrete analysis of below.
Before analysis, first make the following assumptions: 1. all switching tubes and diode are ideal component；2. ignoring isolation to become
The leakage inductance of depressor.
The working condition of switch mode each under mode 1 is made a concrete analysis of below.
1. switching mode 1 [corresponding to attached drawing 3]
Sm1Open-minded, a part of A of DC power supply terminal input power is transmitted to transformer secondary, another part power B flow direction
Auxiliary circuit is finally stored in auxiliary capacitor CxOn.
2. switching mode 2 [corresponding to attached drawing 4]
Sm1Shutdown, auxiliary circuit continues to work, until extra power B is transferred completely into auxiliary capacitor CxOn, auxiliary
Circuit stops working.
3. switching mode 3 [corresponding to attached drawing 5]
Isolating transformer primary circuit does not work at this time, filter inductance electric current iLfRectified diode continuousing flow.
4. switching mode 4 [corresponding to attached drawing 6]
Due in push-pull circuit, the corresponding switching tube of two windings of isolating transformer primary side is in a switch periods
It works alternatively, so this stage, Sm2Open-minded, a part of A of DC power supply terminal input power is still transmitted to transformer secondary, separately
A part of power B then flows to auxiliary circuit.
5. switching mode 5 [corresponding to attached drawing 4]
As 1 lower switch mode 2 of mode, auxiliary circuit works on this mode.
6. switching mode 6 [corresponding to attached drawing 5]
Isolating transformer primary circuit does not work, the rectified diode continuousing flow of filter inductance electric current.
The working condition of switch mode each under mode 2 is made a concrete analysis of below.
1. switching mode 1 [corresponding to attached drawing 7]
Sm1Open-minded, DC power supply terminal input power C is all transmitted to transformer secondary.
2. switching mode 2 [corresponding to attached drawing 8]
Sx1、Sm1Conducting, auxiliary capacitor CxIt is greater than the part D of input power to transformer secondary transmitting output power, i.e., directly
Whole power needed for galvanic electricity source input power is not enough to provide output, insufficient part are auxiliary by what is charged in mode 1
Capacitor is helped to provide.
3. switching mode 3 [corresponding to attached drawing 5]
Sx1And Sm1Shutdown, isolating transformer primary circuit do not work.
4. switching mode 4 [corresponding to attached drawing 9]
This stage, Sm2Open-minded, as 2 lower switch mode 1 of mode, DC power supply terminal input power C is all transmitted to change
Depressor pair side.
5. switching mode 4 [corresponding to attached drawing 10]
This stage, Sx1、Sm2Conducting, auxiliary capacitor CxSupplement input power is not enough to be supplied to the part D of output power.
6. switching mode 4 [corresponding to attached drawing 5]
Sx1And Sm2Shutdown, the rectified diode continuousing flow of filter inductance electric current.
Figure 11 is that the present invention is applied to input current, auxiliary capacitor voltage, filtered electrical under load voltage 110V/50Hz occasion
The simulation waveform of inducing current and load voltage.Since AC load bring power ripple is introduced active auxiliary circuit, so
Big electrolytic capacitor is not set in circuit to filter out low frequency power ripple.The quasi-single-stage inversion it can be seen from simulation waveform
The input side of device is almost without low-frequency ripple.
From above description it is known that quasi-single-stage inverter and its control of a kind of no electrolytic capacitor proposed by the present invention
Method has the advantages that following several respects:
1) since two frequency multiplication pulsating power of AC load bring is flowed through from auxiliary circuit, so direct current input side principle
On there is no power ripple.
2) capacitor in circuit does not need to choose electrolytic capacitor, can choose that the service life is long, the higher capacitor of reliability, such as
Thin-film capacitor etc..
3) voltage stress of polarity reversion converter bridge switching parts pipe is low and is zero-voltage and zero-current switch, improves inversion effect
Rate.
Claims (2)
1. a kind of quasi-single-stage inverter of no electrolytic capacitor, including DC power supply, input filter capacitor (1), main switch (2),
Isolating transformer (3), rectification circuit (4), filter circuit (5), polarity invert inverter bridge (6) and load (7), wherein main switch
It (2) include two switching tubes, isolating transformer (3) includes three windings, and the anode of DC power supply connects input filter capacitor (1)
One end, the cathode of DC power supply, the other end of input filter capacitor (1), the first main switch emitter and the second main switch
The emitter of pipe is connected, and the different name of the first winding terminates the collector of the first main switch, the termination of the same name of the first winding the
The different name end of two windings, the collector of second main switch of termination of the same name of the second winding, rectification circuit (4) include four two poles
Pipe, the anode of the first rectifier diode, the cathode of the second rectifier diode are connected with the Same Name of Ends of the tertiary winding, third rectification
The anode of diode, the cathode of the 4th rectifier diode are connected with the different name end of the tertiary winding, the first rectifier diode and
The cathode of three rectifier diodes connects and composes the positive output end of rectification circuit (4), the second rectifier diode and the 4th two poles of rectification
The anode of pipe connects and composes the negative output terminal of rectification circuit (4), and filter circuit (5) includes filter inductance and filter capacitor, polarity
Inverting inverter bridge (6) includes four switching tubes, and the one of filter inductance terminates the positive output end of rectification circuit (4), filter inductance
The other end, one end of filter capacitor, first switch tube collector be connected with the collector of third switching tube, filter capacitor
The other end, the negative output terminal of rectification circuit (4), the emitter of second switch and the 4th switching tube emitter be connected,
The emitter of one switching tube is connected with the collector of second switch constitutes the positive output end of polarity reversion inverter bridge (6), third
The collector of the emitter of switching tube and the 4th switching tube, which is connected, constitutes the negative output terminal of polarity reversion inverter bridge (6), and polarity is anti-
Turn one end of the positive output terminating load (7) of inverter bridge (6), polarity inverts the another of the negative output terminating load (7) of inverter bridge (6)
One end, it is characterised in that:
It further include active auxiliary circuit (8)；Wherein active auxiliary circuit (8) includes auxiliary induction, auxiliary capacitor, two auxiliary two
Pole pipe and two auxiliary switches, the anode of the first booster diode connect the anode of DC power supply, the yin of the first booster diode
Pole, the anode of auxiliary capacitor, the collector of the second auxiliary switch, isolating transformer (3) the first winding Same Name of Ends and every
The different name end of the second winding from transformer (3) is connected, the negative terminal of auxiliary capacitor, the anode of the second booster diode and first
The emitter of auxiliary switch is connected, the collector of the first auxiliary switch, one end of auxiliary induction and DC power supply it is negative
Pole is connected, and the emitter of the other end of auxiliary induction, the cathode of the second booster diode and the second auxiliary switch is connected.
2. a kind of control method of the quasi-single-stage inverter of no electrolytic capacitor according to claim 1, which is characterized in that institute
State the control method of quasi-single-stage inverter the following steps are included:
Step A detects auxiliary induction current signal, auxiliary capacitor voltage signal, load voltage signal；
Step B, the auxiliary induction current signal that step A is obtained pass through low-pass filter, obtain its low frequency component；
Step C calculates the difference of auxiliary induction current reference signal and auxiliary induction electric current low frequency component；
Step D, the auxiliary capacitor voltage signal that step A is obtained pass through low-pass filter, obtain its DC component；
Step E calculates the difference of auxiliary capacitor voltage reference signal and auxiliary capacitor voltage DC component, the voltage difference that will be obtained
Value is adjusted with PI controller, obtains auxiliary capacitor voltage disturbance signal；
The obtained current differential of step C is adjusted step F with P controller, and the auxiliary capacitor that step E is obtained then is added
Voltage disturbance signal obtains the modulation wave signal of quasi-single-stage inverter auxiliary induction electric current；
Step G obtains the second auxiliary by the modulation wave signal input comparator of aforementioned auxiliary induction electric current compared with sawtooth carrier wave
The pwm control signal of switching tube；
Auxiliary capacitor voltage signal that step A is obtained, load voltage signal are inputted modulating wave computing module respectively, obtained by step H
Obtain the first, second, third modulation wave signal；
Step I, by aforementioned first, second, third modulation wave signal, input comparator obtains the compared with sawtooth carrier wave respectively
One, second, third logical signal；
Step J, the load voltage signal that step A is obtained input zero-crossing comparator, obtain the 4th logical signal；
The signal of aforementioned first, second logical signal and determinating mode 1, mode 2 is distinguished input logic circuit, patrolled by step K
Collect the letter of the signal of the first logical signal and determinating mode 1 access logical AND gate, the second logical signal and determinating mode 2 in circuit
After number access logical AND gate, then accesses logic sum gate and obtain the pwm control signal of main switch；
Second, third aforementioned logical signal is distinguished into input logic circuit, third logical signal, which first passes through, in logic circuits patrols
It is volume non-behind the door and after the second logical signal accesses logical AND gate together, then obtained with the signal access logical AND gate of determinating mode 2
The pwm control signal of first auxiliary switch；
By aforementioned 4th logical signal input logic circuit, logic inverter is first passed through in logic circuits obtain second, third and open
After the pwm control signal for closing pipe, the pwm control signal of the first, the 4th switching tube is obtained using logic inverter；
The pwm control signal input frequency dividing circuit of the obtained main switch of step K is obtained the first main switch by step L respectively
Pwm control signal and the second main switch pwm control signal；
Step M, the second auxiliary switch pwm control signal for respectively obtaining step G, the first auxiliary switch that step K is obtained
The pwm control signal of the pwm control signal of pipe and the first, second, third and fourth switching tube, the first master that step L is obtained
The pwm control signal of switching tube, the second main switch pwm control signal input driving circuit obtain two main switches, two
The driving signal of a auxiliary switch and polarity reversion four switching tubes of inverter bridge, controls quasi-single-stage inverter.
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| CN108183621B (en) * | 2018-03-13 | 2024-02-20 | 刘钰山 | Power density improving method of single-phase quasi-Z source inverter based on SiC |
| CN113489362B (en) * | 2021-07-04 | 2024-01-16 | 西北工业大学 | Isolated single-stage four-quadrant inverter with capacity for energy storage |
| CN116995903B (en) * | 2023-09-26 | 2024-03-15 | 深圳市德兰明海新能源股份有限公司 | Double frequency ripple current control method and device and computer equipment |
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| US6330170B1 (en) * | 1999-08-27 | 2001-12-11 | Virginia Tech Intellectual Properties, Inc. | Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger |
| WO2011014337A1 (en) * | 2009-07-31 | 2011-02-03 | Solarbridge Technologies, Inc. | Apparatus for converting direct current to alternating current |
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103618470A (en) * | 2013-12-03 | 2014-03-05 | 东南大学 | Photovoltaic grid-connection micro inverter and power decoupling control method |
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|---|---|---|---|---|
| US6330170B1 (en) * | 1999-08-27 | 2001-12-11 | Virginia Tech Intellectual Properties, Inc. | Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger |
| WO2011014337A1 (en) * | 2009-07-31 | 2011-02-03 | Solarbridge Technologies, Inc. | Apparatus for converting direct current to alternating current |
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103618470A (en) * | 2013-12-03 | 2014-03-05 | 东南大学 | Photovoltaic grid-connection micro inverter and power decoupling control method |
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