CN201789421U - Single-phase soft switching high-gain boost converter for distributed photovoltaic power generation - Google Patents

Single-phase soft switching high-gain boost converter for distributed photovoltaic power generation Download PDF

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Publication number
CN201789421U
CN201789421U CN2010202460435U CN201020246043U CN201789421U CN 201789421 U CN201789421 U CN 201789421U CN 2010202460435 U CN2010202460435 U CN 2010202460435U CN 201020246043 U CN201020246043 U CN 201020246043U CN 201789421 U CN201789421 U CN 201789421U
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power switch
circuit unit
capacitance
transformer
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李武华
梅烨
赵一
李威辰
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TAIYANG ELECTRIC CO Ltd ZHEJIANG UNIV HANGZHOU
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TAIYANG ELECTRIC CO Ltd ZHEJIANG UNIV HANGZHOU
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

A single-phase soft switching high-gain boost converter for distributed photovoltaic power generation comprises a single-phase boost circuit unit, a transformer voltage doubling circuit unit and an output circuit unit connected sequentially, wherein single-phase boost circuit unit working in a continuous current input mode consists of an input filter inductor, two power switch tubes, a parallel capacitor and a clamping capacitor, the transformer voltage doubling circuit unit consists of a transformer with two windings, a blocking capacitor, a voltage doubling capacitor and a freewheeling diode, the output circuit unit consists of an output diode and an output capacitor, and an output circuit is connected with a load. The single-phase soft switching high-gain boost converter realizes zero-voltage make and break of the first and the second power switch tubes, reduces input current ripples, is simple in circuit structure and convenient in control, and is applicable to high-efficiency conversion occasions for distributed solar power generation.

Description

The single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation
Technical field
The utility model relates to a kind of DC-DC converter, is specifically related to a kind of single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation.
Background technology
In the distributed solar energy photovoltaic generating system,, generally adopt the solar cell parallel-connection structure in order to improve the generating efficiency of solar cell itself.Yet, the lower and excursion broad of the output voltage of monolithic solar panel, and the required busbar voltage of combining inverter is higher, therefore needs the one-level DC-DC converter to realize voltage transitions.The input current of this DC-DC converter is the utilance that continuous current can improve photovoltaic battery panel.Single-phase DC-the DC converter that how to realize the high gain and high efficiency of continuous input current has important promote significance for the development that promotes photovoltaic industry.
The voltage gain of conventional single-phase step-up type (Boost) DC-DC converter only has the duty ratio decision of switching tube, is difficult to realize the voltage gain output greater than ten times.The voltage stress of power device equals output voltage, and voltage stress is higher.And converter is operated in the hard switching state, and switching loss is bigger.In order to realize the soft switch motion of Boost converter, in recent years, some soft switch solution have been studied in succession by additional active power switch or passive device, though these circuit have been realized soft switch motion, but can not reduce the voltage stress of switching tube, can not realize the high-gain conversion of system.In order to promote the voltage gain of converter, a kind of scheme is to adopt the scheme of switching capacity, but the required switching tube quantity of this scheme is more, has increased system cost; Other scheme is to adopt three complicated winding coupled inductance schemes, and the shortcoming of this scheme is the coupling inductance complex structure, is unfavorable for industrial processes, is difficult to guarantee the consistency of circuit.The high-gain converter that existing employing coupling inductance realizes, input current is a discontinuous mode, in order to reduce the input current ripple, needs to adopt jumbo electrochemical capacitor, has both increased the converter volume, has influenced the utilance of photovoltaic generation again.
Summary of the invention
The utility model exists cost height, baroque problem in order to solve work on hand at the converter of soft on off state, provides a kind of continuous input current, all power devices to be soft switch motion, the cost single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation low, simple in structure.
A kind of single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation, the single phase boost booster circuit unit, transformer voltage-multiplying circuit unit and the output circuit unit that comprise the continuous input current pattern that works in that connects successively, described output circuit unit is connected with load, it is characterized in that:
The described single phase boost booster circuit unit that works in the continuous input current pattern is made of an input filter inductance, two power switch pipes, a shunt capacitance and a clamping capacitance, wherein:
First end of input filter inductance links to each other with the positive pole of power supply, second end of input filter inductance links to each other with the drain electrode of first power switch pipe and the source electrode of second power switch pipe, the drain electrode of second power switch pipe links to each other with first end of clamping capacitance, first end of shunt capacitance links to each other with the drain electrode of first power switch pipe, and second end of shunt capacitance links to each other with the negative pole of the source electrode of first power switch pipe and power supply;
Described transformer voltage-multiplying circuit unit has the transformer of two windings, a capacitance, a multiplication of voltage electric capacity and a fly-wheel diode by one and constitutes, wherein:
First end of transformer first winding links to each other with an end of capacitance, the drain electrode of the other end of capacitance and first power switch pipe links to each other with the source electrode of second power switch pipe, one end of transformer second winding links to each other with the drain electrode of second power switch pipe and the anode of fly-wheel diode, the other end of transformer second winding links to each other with an end of multiplication of voltage electric capacity, and the other end of multiplication of voltage electric capacity links to each other with the negative electrode of fly-wheel diode;
In the described output circuit unit, the anode of output diode links to each other with the negative electrode of fly-wheel diode, and the negative electrode of output diode links to each other with first end of output capacitance, and second end of output capacitance links to each other with the negative pole of power supply.
Further, second end of described clamping capacitance links to each other with power cathode.
Perhaps, second end of described clamping capacitance links to each other with positive source.
Perhaps, second end of described clamping capacitance links to each other with first end of output capacitance.
Further, second end of described transformer first winding links to each other with the negative pole of power supply.
Perhaps, second end of described transformer first winding links to each other with the drain electrode of second power switch pipe.
Perhaps, second end of described transformer first winding links to each other with the negative electrode of output diode.
One or more synchronous rectifiers that make in fly-wheel diode in the utility model and the output diode all can operate as normal.
The utility model converter when work, utilize the turn ratio of transformer, for the voltage gain adjustment of converter provides a new variable, can realize that recently wide region and big step-up ratio regulate by the appropriate design transformer turn ratio and switching tube duty; Utilize the turn ratio of transformer to regulate, the voltage stress of cpable of lowering power device greatly reduces the conduction loss of device; Because the existence of shunt capacitance has realized that the no-voltage of first power switch pipe and second power switch pipe is turn-offed; In whole switch periods,, can make first, second power switch pipe realize that no-voltage is open-minded by controlling the gate pulse of first power switch pipe and second power switch pipe.
Advantage of the present utility model has realized the high-gain output of converter; The no-voltage that has realized first, second power switch pipe is turn-offed and is open-minded; The input current ripple is less; And simple in structure, cost is low, need not extra testing circuit, noenergy losser in the circuit can improve the output gain and the circuit efficiency of converter, and in the commutation course, no-voltage overshoot when power switch pipe turn-offs, no current overshoot when fly-wheel diode and output diode turn-off.
Description of drawings
Fig. 1 is the circuit diagram of first kind of connected mode of the present utility model;
Fig. 2 is the circuit diagram of second kind of connected mode of the present utility model;
Fig. 3 is the circuit diagram of the third connected mode of the present utility model;
Fig. 4 is the circuit diagram of the 4th kind of connected mode of the present utility model;
Fig. 5 is the circuit diagram of the 5th kind of connected mode of the present utility model.
Embodiment
Embodiment one
Referring to Fig. 1, the single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation of the present utility model, the single phase boost booster circuit unit 1, transformer voltage-multiplying circuit unit 2 and the output circuit unit 3 that comprise the continuous input current pattern that works in that connects successively
In the described single phase boost booster circuit unit 1 that works in the continuous input current pattern, input filter inductance L fFirst end link to each other input filter inductance L with the positive pole of power supply Vin fSecond end and first power switch tube S 1The drain electrode and second power switch tube S 2Source electrode link to each other second power switch tube S 2Drain electrode link to each other shunt capacitance C with first end of clamping capacitance Cc sFirst end and first power switch tube S 1Drain electrode link to each other shunt capacitance C sSecond end and first power switch tube S 1Source electrode and the negative pole of power supply Vin and second end of clamping capacitance Cc link to each other;
In the described transformer voltage-multiplying circuit unit 2, transformer first winding L 1First end and capacitance C bAn end link to each other capacitance C bThe other end and first power switch tube S 1The drain electrode and second power switch tube S 2Source electrode link to each other transformer first winding L 1Second end link to each other transformer second winding L with the negative pole of power supply Vin 2An end and second power switch tube S 2Drain electrode and the anode of sustained diode r link to each other transformer second winding L 2The other end link to each other with the end of multiplication of voltage capacitor C m, the other end of multiplication of voltage capacitor C m links to each other with the negative electrode of sustained diode r;
In the described output circuit unit 3, the anode of output diode Do links to each other with the negative electrode of sustained diode r, and the negative electrode of output diode Do links to each other with first end of output capacitance Co, and second end of output capacitance Co links to each other with the negative pole of power supply Vin.
The voltage of output capacitance Co is Vout, and energy finally passes to load Ro.
The single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation has two kinds of courses of work, i.e. first power switch tube S in a switch periods 1Turn-off and second power switch tube S 2The commutation course between opening and second power switch tube S 2Turn-off and first power switch tube S 1Commutation course between opening.
First power switch tube S 1Turn-off and second power switch tube S 2The change of current between opening:
Before the change of current, circuit is in first power switch tube S 1With output diode Do conducting, second power switch tube S 2Steady-working state with sustained diode r shutoff.When first power switch tube S 1During shutoff, since the existence of shunt capacitance Cs, first power switch tube S 1Voltage start from scratch and rise, be i.e. first power switch tube S so that certain slope is linear 1Realized the no-voltage shutoff.First power switch tube S 1Voltage when rising to certain value, second power switch tube S 2Diode is open-minded in the body, second power switch tube S 2After diode is opened in the body, provide second power switch tube S 2Gate electrode drive signals, realized second power switch tube S 2No-voltage open-minded.In this process, the electric current of output diode Do drops to zero by certain value with certain slope, and output diode Do turn-offs.And the voltage at sustained diode r two ends drops to zero gradually, sustained diode r conducting.Afterwards, circuit enters first power switch tube S 1Turn-off second power switch tube S 2Open-minded, sustained diode r opens the steady operational status of turn-offing with output diode Do.
Second power switch tube S 2Turn-off and first power switch tube S 1The change of current between opening:
Before the change of current, circuit is in first power switch tube S 1Turn-off second power switch tube S with output diode Do 2Steady-working state with sustained diode r conducting.When second power switch tube S 2During shutoff, second power switch tube S 2Voltage start from scratch and rise, be i.e. second power switch tube S so that certain slope is linear 2Realized the no-voltage shutoff.First power switch tube S 1Voltage drop to zero from certain value with certain slope linearity, first power switch tube S 1Body in diode current flow, provide first power switch tube S then 1Gate electrode drive signals, realized first power switch tube S 1No-voltage open-minded.In this process, the electric current of sustained diode r drops to zero from certain value with certain slope, and sustained diode r turn-offs.And the voltage at output diode Do two ends drops to zero gradually, output diode Do conducting.Afterwards, circuit enters first power switch tube S 1Conducting, second power switch tube S 2Turn-off the steady operational status of sustained diode r shutoff and output diode Do conducting.
Embodiment two
Referring to Fig. 2, the difference of present embodiment and embodiment one is that second end of described clamping capacitance Cc links to each other with power supply Vin is anodal.All the other 26S Proteasome Structure and Functions are all identical.
Embodiment three
Referring to Fig. 3, the difference of present embodiment and embodiment one, two is that second end of described clamping capacitance Cc links to each other with first end of output capacitance Co.All the other 26S Proteasome Structure and Functions are all identical.
Embodiment four
Referring to Fig. 4, the difference of present embodiment and embodiment one is, transformer first winding L 1Second end and second power switch tube S 2Drain electrode link to each other.All the other 26S Proteasome Structure and Functions are all identical.
Embodiment five
Referring to Fig. 5, the difference of present embodiment and embodiment one, four is, transformer first winding L 1Second end link to each other with the negative electrode of output diode Do.All the other 26S Proteasome Structure and Functions are all identical.
The described content of this specification embodiment only is enumerating the way of realization of utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.

Claims (7)

1. single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation, the single phase boost booster circuit unit, transformer voltage-multiplying circuit unit and the output circuit unit that comprise the continuous input current pattern that works in that connects successively, described output circuit unit is connected with load, it is characterized in that:
The described single phase boost booster circuit unit that works in the continuous input current pattern is made of an input filter inductance, two power switch pipes, a shunt capacitance and a clamping capacitance, wherein:
First end of input filter inductance links to each other with the positive pole of power supply, second end of input filter inductance links to each other with the drain electrode of first power switch pipe and the source electrode of second power switch pipe, the drain electrode of second power switch pipe links to each other with first end of clamping capacitance, first end of shunt capacitance links to each other with the drain electrode of first power switch pipe, and second end of shunt capacitance links to each other with the negative pole of the source electrode of first power switch pipe and power supply;
Described transformer voltage-multiplying circuit unit has the transformer of two windings, a capacitance, a multiplication of voltage electric capacity and a fly-wheel diode by one and constitutes, wherein:
First end of transformer first winding links to each other with an end of capacitance, the drain electrode of the other end of capacitance and first power switch pipe links to each other with the source electrode of second power switch pipe, one end of transformer second winding links to each other with the drain electrode of second power switch pipe and the anode of fly-wheel diode, the other end of transformer second winding links to each other with an end of multiplication of voltage electric capacity, and the other end of multiplication of voltage electric capacity links to each other with the negative electrode of fly-wheel diode;
In the described output circuit unit, the anode of output diode links to each other with the negative electrode of fly-wheel diode, and the negative electrode of output diode links to each other with first end of output capacitance, and second end of output capacitance links to each other with the negative pole of power supply.
2. the single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation as claimed in claim 1 is characterized in that: second end of described clamping capacitance links to each other with power cathode.
3. the single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation as claimed in claim 1 is characterized in that: second end of described clamping capacitance links to each other with positive source.
4. the single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation as claimed in claim 1 is characterized in that: second end of described clamping capacitance links to each other with first end of output capacitance.
5. as the described single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation of one of claim 2～4, it is characterized in that: second end of described transformer first winding links to each other with the negative pole of power supply.
6. as the described single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation of one of claim 2～4, it is characterized in that: second end of described transformer first winding links to each other with the drain electrode of second power switch pipe.
7. as the described single-phase soft-switching and high-gain boost converter that is used for distributed photovoltaic power generation of one of claim 2～4, it is characterized in that: second end of described transformer first winding links to each other with the negative electrode of output diode.
CN2010202460435U 2010-07-02 2010-07-02 Single-phase soft switching high-gain boost converter for distributed photovoltaic power generation Expired - Lifetime CN201789421U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101867297A (en) * 2010-07-02 2010-10-20 杭州浙大太阳电气有限公司 Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
CN103051180A (en) * 2012-12-26 2013-04-17 杭州科为达电气有限公司 Voltage-multiplying unit-containing passive lossless clamping high-gain converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101867297A (en) * 2010-07-02 2010-10-20 杭州浙大太阳电气有限公司 Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
CN101867297B (en) * 2010-07-02 2012-02-29 杭州浙大太阳电气有限公司 Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
CN103051180A (en) * 2012-12-26 2013-04-17 杭州科为达电气有限公司 Voltage-multiplying unit-containing passive lossless clamping high-gain converter

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