CN103280976A - Novel high-voltage gain mixing direct-current converter for photovoltaic grid-connected micro-inverter - Google Patents
Novel high-voltage gain mixing direct-current converter for photovoltaic grid-connected micro-inverter Download PDFInfo
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- CN103280976A CN103280976A CN2013101828221A CN201310182822A CN103280976A CN 103280976 A CN103280976 A CN 103280976A CN 2013101828221 A CN2013101828221 A CN 2013101828221A CN 201310182822 A CN201310182822 A CN 201310182822A CN 103280976 A CN103280976 A CN 103280976A
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a novel high-voltage gain mixing direct-current converter for a photovoltaic grid-connected micro-inverter. The novel high-voltage gain mixing direct-current converter consists of an improved novel voltage-multiplying boost converter and a flyback converter and aims at realizing high voltage gain of the converter and reducing the voltage stress of power devices. Since two circuits adopt one input end, the circuit structure is simplified; the output ends of the two circuits are in serial connection with each other to supply the power, so that the overall voltage gain of the mixing converter can be remarkably improved. Through the voltage-multiplying circuit, the voltage gain outputted by the traditional boost circuit can be multiplied, the turn ratio of a transformer in the flyback converter can be reduced, and the reversed blocking voltage stress of an output diode D4 can be effectively alleviated; the leakage inductance energy of the transformer can be recycled through the voltage-multiplying boost circuit, and the system efficiency can be improved; the voltage stress of the main power device can be reduced through a capacitor clamping circuit in the circuit.
Description
Technical field
The present invention relates to high voltage gain mixed DC converter, specifically, is by the novel B oost circuit with times compression functions (circuit A) and the common formation of inverse excitation type converter (circuit B).
Background technology
Limited by the photovoltaic module output voltage, the photovoltaic generating system that is incorporated into the power networks at present adopts the module series-fed more, but the property difference between disparate modules can reduce the generating effect of photovoltaic device, and local shade more can aggravate this problem.Little inverter can realize that single photovoltaic module generates electricity by way of merging two or more grid systems, and is the effective means that addresses this problem.Wherein thereby the module output voltage that the high voltage gain DC converter will be lower is promoted to 350V-400V and realizes that inverter generates electricity by way of merging two or more grid systems, and is the core component of little inverter.
At present, Chinese scholars has proposed multiple high voltage gain converter and has solved thinking.The conventional non-isolated converter boost is limited in one's ability, though can be by increasing the voltage gain that coupling inductance improves converter, thing followed leakage inductance can cause higher switching tube shutoff voltage.Moreover, this type of circuit input current ripple is bigger, has reduced photovoltaic system MPPT maximum power point tracking control effect, and the system power density refractory is to improve.Though crisscross parallel or active clamp circuit can be alleviated the problems referred to above, but the complexity of system configuration and control difficulty have limited its application.Inverse excitation type converter and Boost circuit organically combine, and can effectively utilize the transformer leakage inductance energy, improve system effectiveness, but inverse excitation type converter output diode reverse blocking voltage problem of higher exist still.Therefore, research can be satisfied be incorporated into the power networks high voltage gain, the high efficiency of job requirement, the DC converter of reliable operation of photovoltaic module becomes little inverter development urgent problem.
Summary of the invention
At above-mentioned technological deficiency, the object of the present invention is to provide a kind of novel high voltage gain mixed DC converter, it is by multiplication of voltage Boost circuit and inverse excitation type converter be combined into, simplify circuit structure by the common sparing device, power to the load by series connection foregoing circuit output and to improve the system voltage gain, and because the remarkable lifting of multiplication of voltage Boost circuit output voltage, alleviate the inverse excitation type converter operating pressure, reduced the reverse blocking voltage of inverse excitation type converter output diode then.
The present invention adopts following technical scheme:
Be used for the novel high voltage gain mixed DC converter of the little inverter of photovoltaic, comprise reverse excitation circuit, Boost circuit and voltage-multiplying circuit thereof, reverse excitation circuit comprises power switch pipe MOS, the input capacitance C of transformer HT primary side
In, inverse excitation type converter magnetizing inductance L
mWith leakage inductance L
K, and the diode D of transformer HT secondary side
4, capacitor C
O2The Boost circuit comprises diode D
1, capacitor C
R1And the device of above-mentioned transformer HT primary side; The Boost voltage-multiplying circuit comprises capacitor C
R2, inductance L, diode D
2With diode D
3, it is characterized in that the anode of power supply connects input capacitance C
InAnode and magnetizing inductance L
m, the negative terminal of power supply connects input capacitance C respectively
InThe source electrode of negative terminal, power switch pipe MOS, capacitor C
R1Negative terminal and capacitor C
O1Negative terminal; Described leakage inductance L
KPositive termination magnetizing inductance L
mNegative terminal, described leakage inductance L
KNegative terminal connects capacitor C respectively
R2Negative terminal, diode D
1Negative terminal and power switch pipe MOS drain electrode; One termination capacitor C of described inductance L
R2Anode, another terminating diode D
2Negative terminal and diode D
3Anode; Described diode D
4The negative terminal that just terminates at transformer HT, diode D
4Negative terminal be connected on capacitor C
O2Anode, capacitor C
O2Negative terminal connect anode and the capacitor C of transformer HT respectively
O1Anode.
The high voltage gain that circuit of the present invention has, high efficiency extremely are suitable for the small-power grid-connected power generation system, and its concrete advantage is as follows:
1) magnetizing inductance of the former avris of inverse excitation type converter, input capacitance and switching device MOS are the input of multiplication of voltage Boost circuit simultaneously, and circuit structure is simple; Output has effectively improved the gain of voltage by the foregoing circuit series-fed; Take full advantage of the leakage inductance of inverse excitation type converter, improved circuit conversion efficient.
2) the remarkable increase of multiplication of voltage Boost circuit output voltage can effectively reduce the turn ratio of transformer in the inverse excitation type converter, thereby alleviates the reverse blocking voltage stress of output diode.
3) electric capacity has reduced the voltage withstand class of device to the effective clamper of the shutoff voltage of MOS device in the multiplication of voltage Boost circuit.
Description of drawings
Fig. 1 is mixed type high-gain DC converter circuit diagram of the present invention.
Fig. 2-Fig. 6 is five working stages in switch periods of mixing transformation device proposed by the invention.
Fig. 7 is groundwork waveform in the switch periods.
Fig. 8 is that different circuit voltage gains are compared.
Embodiment
As shown in Figure 1, the present invention is by the novel B oost circuit of times compression functions (circuit A) and inverse excitation type converter (circuit B) is common constitutes, and Boost circuit and inverse excitation type converter shared input have been simplified circuit structure, and can take full advantage of the leakage inductance of transformer, improved system effectiveness; The output of two circuit connects to improve the overall voltage gain of converter.The doubling of multiplication of voltage Boost circuit output voltage promotes, and reduced the turn ratio of transformer in the inverse excitation type converter, alleviated the reverse shutoff voltage stress of output diode, and the turn ratio reduces and reduced leakage inductance energy simultaneously, has improved the efficient of system.Electric capacity in this circuit carries out clamper to the shutoff voltage of main power device, has reduced the voltage stress of device.
Above-mentioned DC-DC DC converter, as shown in the figure, its principle is probably as follows:
To simplify the analysis, suppose that MOSFET in the circuit, diode and electric capacity etc. are desirable device, power supply is desirable direct voltage source, and circuit has been operated in stable state, and corresponding circuit waveform as shown in Figure 7.
[t
0, t
1] [Fig. 2]: t
0Initial moment power device Mos has stablized conducting, D
1Oppositely end capacitor C
R1, C
R2Voltage equates and is U
Cr1During this period, magnetizing inductance L
mAnd leakage inductance L
kElectric current continues to rise to t
1The time reach maximum, stored energy also reaches maximum; Inverse excitation type converter secondary side output diode D
4Reverse bias, load is by output capacitance C
O1And C
O2Series-fed.(power device Mos conducting, diode D
1, D
2Turn-off).
[t
1, t
2] [Fig. 3]: t
1Constantly Mos turn-offs, and inductance energy begins through two loops to load transfer: magnetizing inductance L
mThe part energy storage is transmitted energy by transformer HT to secondary side; Another part energy storage and leakage inductance L
kEnergy, power supply U
InAnd capacitor C
R2Series connection powers to the load, at this moment capacitor C
O1Output voltage is 2U
Cr1, make this circuit output voltage gain reach the twice of traditional B oost circuit.In this stage, capacitor C
R1Be recharged until t
2Moment diode D
1Reverse bias.Because C
R1Clamper power device Mos shutoff voltage be limited in a lower level, reduced device shutoff voltage stress.(power device Mos, diode D
2Turn-off diode D
1, D
3, D
4Conducting).
[t
2, t
3] [Fig. 4]: in this stage, except capacitor C
R1Stop outside the charging, all the other courses of work are with similar on last stage, until t
3Moment capacitor C
O1Because of diode D
3Reverse bias stops charging, and the Circuit Fault on Secondary Transformer electric current reaches peak value.
[t
3, t
4] [Fig. 5]: in this interval, the energy in the magnetizing inductance continues to power to the load through reverse excitation circuit, until power device Mos conducting again.
[t
4, t
0] [Fig. 6]: at t
4Mos conducting constantly, inductance L
m, L
kThe beginning stored energy; Capacitor C
R1By current-limiting inductance L, power device Mos to capacitor C
R2Charging equates until two capacitance voltages.
So far, circuit has been finished the work of one-period.
Table 1 is when output voltage 380V, respectively at the turn ratio (n=4), duty ratio (D
Max=0.7) D under the permanence condition
4The maximum reverse blocking voltage that bears.As known from Table 1, the diode electrically compression that proposes of this paper obviously improves.For other power devices, their voltage stress only is capacitor C
R1Voltage, voltage stress have had tangible improvement.
Specific embodiments of the invention are as follows: input voltage range between 30-40, rated output voltage 380V, the transformer turn ratio is 67:12, under the above-mentioned condition, can calculate the maximum voltage stress of device in the circuit: power device Mos, capacitor C
R1, C
R2Voltage stress be 225V; The voltage stress of output diode D4 is 465V.
Table one. diode D
4The voltage stress contrast
Circuit voltage of the present invention gain and different circuit voltages gain more as shown in Figure 8, among the figure, curve 1 is the voltage gain under the different duty that the present invention surveys, curve 2 is Boost+ reverse excitation circuit voltage gains under different duty, and curve 3 is reverse excitation circuit voltage gains under different duty.This figure shows that circuit voltage of the present invention gains under same duty cycle apparently higher than other circuit.
Claims (1)
1. be used for the novel high voltage gain mixed DC converter of the little inverter of photovoltaic, comprise reverse excitation circuit, Boost circuit and voltage-multiplying circuit thereof, reverse excitation circuit comprises power switch pipe MOS, the input capacitance C of transformer HT primary side
In, inverse excitation type converter magnetizing inductance L
mWith leakage inductance L
K, and the diode D of transformer HT secondary side
4, capacitor C
O2The Boost circuit comprises diode D
1, capacitor C
R1And the device of above-mentioned transformer HT primary side; The Boost voltage-multiplying circuit comprises capacitor C
R2, inductance L, diode D
2With diode D
3, it is characterized in that the anode of power supply connects input capacitance C
InAnode and magnetizing inductance L
m, the negative terminal of power supply connects input capacitance C respectively
InThe source electrode of negative terminal, power switch pipe MOS, capacitor C
R1Negative terminal and capacitor C
O1Negative terminal; Described leakage inductance L
KPositive termination magnetizing inductance L
mNegative terminal, described leakage inductance L
KNegative terminal connects capacitor C respectively
R2Negative terminal, diode D
1Negative terminal and power switch pipe MOS drain electrode; One termination capacitor C of described inductance L
R2Anode, another terminating diode D
2Negative terminal and diode D
3Anode; Described diode D
4The negative terminal that just terminates at transformer HT, diode D
4Negative terminal be connected on capacitor C
O2Anode, capacitor C
O2Negative terminal connect anode and the capacitor C of transformer HT respectively
O1Anode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101828221A CN103280976A (en) | 2013-05-16 | 2013-05-16 | Novel high-voltage gain mixing direct-current converter for photovoltaic grid-connected micro-inverter |
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| CN2013101828221A CN103280976A (en) | 2013-05-16 | 2013-05-16 | Novel high-voltage gain mixing direct-current converter for photovoltaic grid-connected micro-inverter |
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| CN103280976A true CN103280976A (en) | 2013-09-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158402A (en) * | 2014-08-27 | 2014-11-19 | 南京国睿新能电子有限公司 | Novel boost switching power supply |
| CN104283419A (en) * | 2014-07-29 | 2015-01-14 | 华南理工大学 | Secondary type high-gain boosting converter with switched capacitors and coupled inductor |
| CN106936300A (en) * | 2017-03-29 | 2017-07-07 | 中国矿业大学 | A kind of efficient high-gain DC_DC converters of low input current ripple of non-isolation type |
| CN110661424A (en) * | 2019-09-29 | 2020-01-07 | 三峡大学 | High-gain flyback DC/DC converter with high utilization rate of high transformer |
| CN111162672A (en) * | 2020-01-15 | 2020-05-15 | 广东工业大学 | DC-DC converter based on X-type switch network and switch power supply |
| CN115987103A (en) * | 2023-02-06 | 2023-04-18 | 广东工业大学 | Multi-mode booster circuit, device, control method and medium for miniature photovoltaic system |
Citations (4)
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|---|---|---|---|---|
| CN101510726A (en) * | 2009-03-23 | 2009-08-19 | 浙江大学 | Passive clamping voltage boosting type interleave parallel connection converter implemented by coupling inductance and switch capacitance |
| CN101714815A (en) * | 2009-12-14 | 2010-05-26 | 浙江大学 | Boost type converter for realizing high-gain voltage multiplication by coupling inductors |
| CN201985757U (en) * | 2011-03-04 | 2011-09-21 | 浙江大学 | Boost converter of voltage doubling unit of built-in transformer and switched capacitor |
| CN102832809A (en) * | 2012-08-07 | 2012-12-19 | 燕山大学 | Inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter |
-
2013
- 2013-05-16 CN CN2013101828221A patent/CN103280976A/en active Pending
Patent Citations (4)
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| CN101510726A (en) * | 2009-03-23 | 2009-08-19 | 浙江大学 | Passive clamping voltage boosting type interleave parallel connection converter implemented by coupling inductance and switch capacitance |
| CN101714815A (en) * | 2009-12-14 | 2010-05-26 | 浙江大学 | Boost type converter for realizing high-gain voltage multiplication by coupling inductors |
| CN201985757U (en) * | 2011-03-04 | 2011-09-21 | 浙江大学 | Boost converter of voltage doubling unit of built-in transformer and switched capacitor |
| CN102832809A (en) * | 2012-08-07 | 2012-12-19 | 燕山大学 | Inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter |
Non-Patent Citations (1)
| Title |
|---|
| T.J.LIANG, EL AL.: "《Analysis of integrated boost-flyback step-up converter》", 《IEE PROC.-ELECTR. POWER APPL.》, vol. 152, no. 2, 31 March 2005 (2005-03-31), pages 219 - 225 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283419A (en) * | 2014-07-29 | 2015-01-14 | 华南理工大学 | Secondary type high-gain boosting converter with switched capacitors and coupled inductor |
| CN104158402A (en) * | 2014-08-27 | 2014-11-19 | 南京国睿新能电子有限公司 | Novel boost switching power supply |
| CN106936300A (en) * | 2017-03-29 | 2017-07-07 | 中国矿业大学 | A kind of efficient high-gain DC_DC converters of low input current ripple of non-isolation type |
| CN110661424A (en) * | 2019-09-29 | 2020-01-07 | 三峡大学 | High-gain flyback DC/DC converter with high utilization rate of high transformer |
| CN110661424B (en) * | 2019-09-29 | 2021-04-02 | 三峡大学 | High-gain flyback DC/DC converter with high utilization rate of high transformer |
| CN111162672A (en) * | 2020-01-15 | 2020-05-15 | 广东工业大学 | DC-DC converter based on X-type switch network and switch power supply |
| CN111162672B (en) * | 2020-01-15 | 2021-04-16 | 广东工业大学 | DC-DC converter based on X-type switch network and switch power supply |
| CN115987103A (en) * | 2023-02-06 | 2023-04-18 | 广东工业大学 | Multi-mode booster circuit, device, control method and medium for miniature photovoltaic system |
| CN115987103B (en) * | 2023-02-06 | 2023-07-28 | 广东工业大学 | Multimode booster circuit, device, control method and medium for micro photovoltaic system |
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Application publication date: 20130904 |