CN102739089A - High-efficiency transformer-free inverter circuit and control method - Google Patents
High-efficiency transformer-free inverter circuit and control method Download PDFInfo
- Publication number
- CN102739089A CN102739089A CN2012102191682A CN201210219168A CN102739089A CN 102739089 A CN102739089 A CN 102739089A CN 2012102191682 A CN2012102191682 A CN 2012102191682A CN 201210219168 A CN201210219168 A CN 201210219168A CN 102739089 A CN102739089 A CN 102739089A
- Authority
- CN
- China
- Prior art keywords
- power switch
- switch tube
- power
- emitter
- collector 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.)
- Pending
Links
Images
Abstract
The invention relates to the technical field of power electronics, in particular to a high-efficiency transformer-free inverter circuit and a control method. The circuit comprises a power switch tube S1, a power switch tube S2, a power switch tube S3, a power switch tube S4, a power switch tube S5, a power switch tube S6, a power diode D1, a filter inductor L1, a filter inductor L2, a direct current power supply direct current (DC) and a filter capacitor C. Compared with the prior art, the inverter circuit adopting a monopolar modulation method can solve a problem of leakage current generated by high-frequency pulse width modulation (PWM). Compared with the conventional H6 single-phase inverter full bridge, the circuit has higher inversion efficiency and is low in cost.
Description
Technical field
The present invention relates to electric and electronic technical field, specifically a kind of type inverter circuit of transless efficiently and control method.
Background technology
In recent years, because the reliability that solar energy has the benefit of numerous environmental protection and economic aspect and experiences all sorts of checking, solar energy becomes a kind of main renewable energy resources form.In solar power system, the effect of inversion change-over circuit is that the direct current that solar panel sends is converted into alternating current, and the inversion change-over circuit has important effect in solar power system.
Solar energy system can be divided into from net type and grid type usually, and the latter is owing to the energy that can farthest utilize solar panel to send is widely used.Inverter topology totally can be divided into band transformer isolation and transless type.Isolating transformer can be realized the effect isolating and boost, and volume is heavy, efficient is low, cost is high, the shortcoming of inconvenient installation but Industrial Frequency Transformer exists; Though the high frequency transformer volume and weight descends, the high frequency transformer system complex, and there is DC component in output current, and efficient is on the low side too.Therefore, transless type inverter becomes the main flow of grid-connected photovoltaic power generation because system configuration is simple, efficient is high, volume is little and low acquisition of cost developed fast.
Because the solar panel area is bigger; Parasitic capacitance is also bigger over the ground; There is electric pathway between power switch pipe, filter inductance and the electrical network in solar panel end, parasitic capacitance and the inverter in addition; And the switching device in the inverter switches at high frequency, thereby might form big leakage current, and this leakage current possibly bring hidden danger to operating personnel's personal safety.Therefore effectively suppressing and eliminate leakage current fully is the key issue that transless type inverter need solve.
At present, for the single-phase transless type grid-connected photovoltaic inverter of middle low power, often adopt the full-bridge circuit of bipolarity modulation and half-bridge circuit to solve leakage problem.The full-bridge circuit switching loss of bipolarity modulation is big, filter inductance is big, thereby efficient is on the low side; The input voltage of half-bridge circuit is the twice of full-bridge circuit voltage, often needs two-stage circuit to realize, strengthens circuit and realizes difficulty, has the low problem of conversion efficiency equally.
Therefore, design and a kind ofly can either solve leakage problem, can realize that again the transless type inverter circuit of higher conversion efficiency and lower cost is vital.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of and can either solve leakage problem, can realize the transless type inverter circuit of higher conversion efficiency and lower cost again.
In order to achieve the above object; The present invention has designed a kind of type of transless efficiently inverter circuit; It is characterized in that: comprise power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, power diode D1, filter inductance L1, filter inductance L2, DC power supply DC and filter capacitor C, the collector electrode of power switch tube S 1 is connected the back and is connected with the positive pole of DC power supply DC with the collector electrode of power switch tube S 3; The emitter of power switch tube S 1 divides three the tunnel to be connected with the collector electrode of power switch tube S 5, the emitter of power switch tube S 6 and the end of filter inductance L1 respectively, and the other end of filter inductance L1 is connected with the end of filter capacitor C; The emitter of power switch tube S 3 divides four the tunnel to be connected with the negative electrode of power diode D1, the collector electrode of power switch tube S 4, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, and the other end of filter inductance L2 is connected with the other end of filter capacitor C; The emitter of power switch tube S 5 divides two-way to be connected with the collector electrode of power switch tube S 2 and the anode of power diode D1 respectively; The emitter of power switch tube S 2 is connected the back and is connected with the negative pole of DC power supply DC with the emitter of power switch tube S 4.
Described power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5 and power switch tube S 6 are made up of insulated gate bipolar transistor IGBT or are made up of metal-oxide half field effect transistor MOSFET.
Described transless type inverter circuit is accomplished following steps and constantly circulation successively: step 1; When t0-t1; Power switch tube S 1 is identical with the action of power switch tube S 4 with fast frequency switching and the power switch tube S 1 of 19.2KHz with power switch tube S 4; Power switch tube S 6 is open-minded, and power switch tube S 2, power switch tube S 3 and power switch tube S 5 are turn-offed; Step 2; When t1-t2; Power switch tube S 2 is identical with the action of power switch tube S 3 with fast frequency switching and the power switch tube S 2 of 19.2KHz with power switch tube S 3, and power switch tube S 5 is open-minded, and power switch tube S 1, power switch tube S 4 and power switch tube S 6 are turn-offed; Described t0, t1, t2 are according to the time order and function sequence arrangement, and t0 refers to the moment that line voltage turns negative number to positive number, and t1 refers to line voltage by just changeing the negative moment, and t2 refers to the moment that line voltage turns negative number to positive number for the second time.
The present invention compares with prior art, and inverter circuit adopts the unipolarity modulation system, not only can solve the leakage problem that high-frequency impulse width modulated PWM produces, and compares with traditional H6 single-phase inversion full-bridge, has higher conversion efficiency and lower cost.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is drive signal figure of the present invention.
Fig. 3 is that the present invention is at the t0-t1 moment, the current circuit figure when power switch tube S 1 and power switch tube S 4 are opened.
Fig. 4 for the present invention at t0-t1 constantly, the current circuit figure when power switch tube S 1 is turn-offed with power switch tube S 4.
Fig. 5 is that the present invention is at the t1-t2 moment, the current circuit figure when power switch tube S 2 and power switch tube S 3 are opened.
Fig. 6 for the present invention at t1-t2 constantly, the current circuit figure when power switch tube S 2 is turn-offed with power switch tube S 3.
Embodiment
Combine accompanying drawing that the present invention is done further describes at present.
Referring to Fig. 1; The present invention has designed a kind of type of transless efficiently inverter circuit, comprises power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, power diode D1, filter inductance L1, filter inductance L2, DC power supply DC and filter capacitor C.The collector electrode of power switch tube S 1 is connected the back and is connected with the positive pole of DC power supply DC with the collector electrode of power switch tube S 3; The emitter of power switch tube S 1 divides three the tunnel to be connected with the collector electrode of power switch tube S 5, the emitter of power switch tube S 6 and the end of filter inductance L1 respectively, and the other end of filter inductance L1 is connected with the end of filter capacitor C; The emitter of power switch tube S 3 divides four the tunnel to be connected with the negative electrode of power diode D1, the collector electrode of power switch tube S 4, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, and the other end of filter inductance L2 is connected with the other end of filter capacitor C; The emitter of power switch tube S 5 divides two-way to be connected with the collector electrode of power switch tube S 2 and the anode of power diode D1 respectively; The emitter of power switch tube S 2 is connected the back and is connected with the negative pole of DC power supply DC with the emitter of power switch tube S 4.Power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5 and power switch tube S 6 are made up of insulated gate bipolar transistor IGBT or are made up of metal-oxide half field effect transistor MOSFET.
Referring to Fig. 2; Transless type inverter circuit is accomplished following steps and constantly circulation successively: step 1; When t0-t1; Power switch tube S 1 is identical with the action of power switch tube S 4 with fast frequency switching and the power switch tube S 1 of 19.2KHz with power switch tube S 4, and power switch tube S 6 is open-minded, and power switch tube S 2, power switch tube S 3 and power switch tube S 5 are turn-offed; Step 2; When t1-t2; Power switch tube S 2 is identical with the action of power switch tube S 3 with fast frequency switching and the power switch tube S 2 of 19.2KHz with power switch tube S 3, and power switch tube S 5 is open-minded, and power switch tube S 1, power switch tube S 4 and power switch tube S 6 are turn-offed; Described t0, t1, t2 are according to the time order and function sequence arrangement, and t0 refers to the moment that line voltage turns negative number to positive number, and t1 refers to line voltage by just changeing the negative moment, and t2 refers to the moment that line voltage turns negative number to positive number for the second time.
The present invention accomplishes following steps and constantly circulation successively when work:
Because the conducting voltage of power switch tube S 5 and power diode D1 is very little, can ignore.Therefore, can think the electrical network mid point by power switch tube S 1, power switch tube S 2, power switch tube S 3 and the decision of power switch tube S 4 dividing potential drops, the midpoint potential difference of the midpoint potential of electrical network and DC power supply DC also is the cycle with the mains frequency.So the present invention is when switching at a high speed, input side and outlet side do not have high frequency voltage yet, thus the leakage current of having avoided high-frequency impulse width modulated PWM to produce.In addition, power switch tube S 3 is switched between 0.5Vdc and Vdc, power switch tube S 20 and 0.5Vdc between switch, switched voltage has only half input voltage, thereby has reduced the switching loss of power switch tube S 2 and power switch tube S 3, has improved conversion efficiency.
Claims (3)
1. transless type inverter circuit efficiently; It is characterized in that: comprise power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, power diode D1, filter inductance L1, filter inductance L2, DC power supply DC and filter capacitor C, the collector electrode of power switch tube S 1 is connected the back and is connected with the positive pole of DC power supply DC with the collector electrode of power switch tube S 3; The emitter of power switch tube S 1 divides three the tunnel to be connected with the collector electrode of power switch tube S 5, the emitter of power switch tube S 6 and the end of filter inductance L1 respectively, and the other end of filter inductance L1 is connected with the end of filter capacitor C; The emitter of power switch tube S 3 divides four the tunnel to be connected with the negative electrode of power diode D1, the collector electrode of power switch tube S 4, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, and the other end of filter inductance L2 is connected with the other end of filter capacitor C; The emitter of power switch tube S 5 divides two-way to be connected with the collector electrode of power switch tube S 2 and the anode of power diode D1 respectively; The emitter of power switch tube S 2 is connected the back and is connected with the negative pole of DC power supply DC with the emitter of power switch tube S 4.
2. a kind of type of transless efficiently inverter circuit according to claim 1 is characterized in that: described power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5 and power switch tube S 6 are made up of insulated gate bipolar transistor IGBT or are made up of metal-oxide half field effect transistor MOSFET.
3. a kind of type of transless efficiently inversion controlling method according to claim 1; It is characterized in that: described transless type inverter circuit is accomplished following steps and constantly circulation successively: step 1; When t0-t1; Power switch tube S 1 is identical with the action of power switch tube S 4 with fast frequency switching and the power switch tube S 1 of 19.2KHz with power switch tube S 4, and power switch tube S 6 is open-minded, and power switch tube S 2, power switch tube S 3 and power switch tube S 5 are turn-offed; Step 2; When t1-t2; Power switch tube S 2 is identical with the action of power switch tube S 3 with fast frequency switching and the power switch tube S 2 of 19.2KHz with power switch tube S 3, and power switch tube S 5 is open-minded, and power switch tube S 1, power switch tube S 4 and power switch tube S 6 are turn-offed; Described t0, t1, t2 are according to the time order and function sequence arrangement, and t0 refers to the moment that line voltage turns negative number to positive number, and t1 refers to line voltage by just changeing the negative moment, and t2 refers to the moment that line voltage turns negative number to positive number for the second time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102191682A CN102739089A (en) | 2012-06-28 | 2012-06-28 | High-efficiency transformer-free inverter circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102191682A CN102739089A (en) | 2012-06-28 | 2012-06-28 | High-efficiency transformer-free inverter circuit and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102739089A true CN102739089A (en) | 2012-10-17 |
Family
ID=46994028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102191682A Pending CN102739089A (en) | 2012-06-28 | 2012-06-28 | High-efficiency transformer-free inverter circuit and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102739089A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972906A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Reactive power control method of non-isolated single-phase photovoltaic grid-connected inverter |
| CN107204719A (en) * | 2017-04-11 | 2017-09-26 | 江苏大学 | It is used for the inverter topology circuit and its control method for suppressing leakage current in photovoltaic parallel in system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163935A (en) * | 2011-03-04 | 2011-08-24 | 东南大学 | Photovoltaic grid-connected converter with alternating bypass unit |
| CN102223097A (en) * | 2011-06-27 | 2011-10-19 | 上海正泰电源系统有限公司 | Transformerless inverter circuit |
| CN102427312A (en) * | 2011-10-25 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
-
2012
- 2012-06-28 CN CN2012102191682A patent/CN102739089A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163935A (en) * | 2011-03-04 | 2011-08-24 | 东南大学 | Photovoltaic grid-connected converter with alternating bypass unit |
| CN102223097A (en) * | 2011-06-27 | 2011-10-19 | 上海正泰电源系统有限公司 | Transformerless inverter circuit |
| CN102427312A (en) * | 2011-10-25 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972906A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Reactive power control method of non-isolated single-phase photovoltaic grid-connected inverter |
| CN107204719A (en) * | 2017-04-11 | 2017-09-26 | 江苏大学 | It is used for the inverter topology circuit and its control method for suppressing leakage current in photovoltaic parallel in system |
| CN107204719B (en) * | 2017-04-11 | 2019-10-01 | 江苏大学 | For inhibiting the inverter topology circuit and its control method of leakage current in photovoltaic parallel in system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102223097B (en) | Transformerless inverter circuit | |
| CN103001526B (en) | A kind of non-isolation type inverter and control method thereof | |
| CN103051233B (en) | Non-isolated single-phase photovoltaic grid-connected inverter and on-off control timing sequence thereof | |
| CN100517936C (en) | Dual-boosting energy feedback type PWM rectification circuit | |
| CN102163852B (en) | Neutral point clamped non-isolated photovoltaic grid-connected inverter | |
| CN102751895B (en) | Multi-level circuit, grid-connected inverter and modulation method of grid-connected inverter | |
| CN101895223B (en) | Double-Cuk buck-boost output parallel-type converter | |
| CN205647288U (en) | Non - isolated form photovoltaic grid -connected inverter | |
| CN102361408A (en) | Non-isolated photovoltaic grid-connected inverter and switching control time sequence thereof | |
| CN102255544A (en) | DC (direct current)/AC (alternating current) inverter circuit | |
| CN202513843U (en) | Full-bridge grid-connected inverter | |
| CN104638971A (en) | Photovoltaic grid-connected inverter and control method thereof | |
| CN202524315U (en) | DC/AC grid-connected inversion circuit | |
| CN102710133B (en) | Seven-level circuit, a grid-connected inverter and modulation method and device of seven-level circuit | |
| CN102684530A (en) | Method for controlling transformerless inverter with reactive power compensation function | |
| CN111342693B (en) | Boost-buck photovoltaic grid-connected inverter | |
| CN202495887U (en) | Inverter used in photovoltaic power generation | |
| CN103312211A (en) | Control method of single phase grid-connected inverter | |
| CN105656077A (en) | Efficient low-leakage current seven-switch photovoltaic grid-connected inverter circuit and modulation method thereof | |
| CN103178734A (en) | Photovoltaic inverter | |
| Amirahmadi et al. | Variable boundary dual mode current modulation scheme for three-phase micro-inverter | |
| CN103337975A (en) | Current source transverter and control method thereof | |
| CN102710162B (en) | Seven-level circuit, grid-connected inverter and modulation method and device for grid-connected inverter | |
| CN105186900A (en) | Five-level transformerless inverter circuit | |
| CN101908831A (en) | Circuit for converting direct-current voltage into alternating-current voltage |
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: 20121017 |