CN104506036B - Suitable for the dual power supply input direct-current DC converter of photovoltaic generation occasion - Google Patents
Suitable for the dual power supply input direct-current DC converter of photovoltaic generation occasion Download PDFInfo
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- CN104506036B CN104506036B CN201510001796.7A CN201510001796A CN104506036B CN 104506036 B CN104506036 B CN 104506036B CN 201510001796 A CN201510001796 A CN 201510001796A CN 104506036 B CN104506036 B CN 104506036B
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Abstract
The present invention relates to a kind of dual power supply input direct-current DC converter suitable for photovoltaic generation occasion, the first end of the winding of coupling inductance first is connected with the positive pole of the first power supply, and the second end of the first winding is connected with the source electrode of the drain electrode of power switch pipe and clamp switch pipe；The first end of the winding of coupling inductance second is connected with the drain electrode of power switch pipe, second end of the winding of coupling inductance second is connected with the first end of times voltage capacitance, second end of times voltage capacitance is connected with the anode of output diode, and the negative electrode of output diode is connected with the first end of the first end of output capacitance and load resistance；The positive pole of second source is connected with the anode of fly-wheel diode, and the negative electrode of fly-wheel diode is connected with the anode of output diode, and the negative pole of second source is connected with the negative pole of the first power supply.Dual power supply input direct-current DC converter of the invention overcomes single supply input, efficiency is low and the defeated power of system haves the shortcomings that fluctuation.
Description
Technical field
The present invention relates to a kind of DC-to-DC converter, specifically suitable for the dual power supply input of photovoltaic generation occasion
DC-DC converter.
Background technology
In solar power system, while there are two kinds of photovoltaic cell components of crystal silicon battery and hull cell.Crystal silicon electricity
The output voltage in pond is relatively low and electric current is larger, and the output voltage of hull cell is higher and electric current is smaller.But in general, crystal silicon is electric
Pond and hull cell all do not reach inversion grid connection and generate electricity required voltage, it is necessary to increasing apparatus are the voltage conversion of photovoltaic cell
It is adapted to grid-connected HVDC.In distributed solar energy electricity generating plan, the power capacity of monolithic solar cell is smaller, but right
The requirement of efficiency is higher.Therefore the single-phase single-grade converter of high efficiency and simple structure how is realized, for promoting photovoltaic industry
Development it is significant.
The voltage gain of conventional single-phase single-tube booster type (Boost) DC-DC converter only has dutycycle decision,
Voltage gain is limited, it is difficult to meet the conversion requirement of high-gain.The voltage stress of power switch pipe is larger, it is difficult to high using low pressure
The switching tube of performance reduces conduction loss.And, converter is operated in hard switching state, and switching loss is larger.In order to realize
The Sofe Switch action of Boost, in recent years, have studied some and is switched by additional active power or passive device in succession
Although Sofe Switch scheme, these circuits realize Sofe Switch and act, but can not reduce the voltage stress of switching tube, can not be real
The high-gain conversion of existing system.For the voltage gain of Lifting Transform device, a kind of scheme is the scheme for using switching capacity, but this
Switching tube quantity needed for the scheme of kind is more, increased system cost；Other scheme is using complicated three winding coupling inductance
Scheme, the shortcoming of this scheme is coupling inductance complex structure, is unfavorable for industrial processes, it is difficult to ensure the uniformity of circuit.
And conventional converter often can only single input, realize one piece of conversion and MPPT maximum power point tracking of battery, such as
Fruit, for the MPPT for realizing each component will be that each component is equipped with independent converter, makes when photovoltaic module is used on a large scale
System becomes complicated, while conventional inverter also is difficult to meet two kinds of photovoltaic module requirements used at the same time simultaneously.
Photovoltaic cell output simultaneously is affected by environment very big, generally requires to add energy storage link, it is necessary to and outer converter
Energy is obtained from battery to realize the steady output of power, the complexity of system is further increased.
The content of the invention
The present invention will overcome the single supply of conventional single-phase DC-DC converter to be input into, efficiency is low and the defeated power of system
There is fluctuation, there is provided a kind of simple structure, easy to control and dual power supply input direct-current suitable for photovoltaic generation occasion-
DC converter.
Suitable for the dual power supply input direct-current-DC converter of photovoltaic generation occasion, the first of the winding of coupling inductance first
End is connected with the positive pole of the first power supply, the second end of the first winding and the drain electrode of power switch pipe and the source electrode phase of clamp switch pipe
Even, the drain electrode of clamp switch pipe is connected with the first end of clamping capacitance, the source electrode of power switch pipe and the second end of clamping capacitance
And first power supply negative pole be connected；
The first end of the winding of coupling inductance second is connected with the drain electrode of power switch pipe, and the second of the winding of coupling inductance second
End is connected with the first end of times voltage capacitance, and the second end of times voltage capacitance is connected with the anode of output diode, output diode
Negative electrode is connected with the first end of output capacitance and the first end of load resistance, the second end of output capacitance and the second of load resistance
The negative pole of end and the first power supply is connected；
The positive pole of second source is connected with the anode of fly-wheel diode, the negative electrode of fly-wheel diode and the sun of output diode
Extremely it is connected, the negative pole of second source is connected with the negative pole of the first power supply.
Further, one or two Wei photovoltaic module or battery in the first power supply and second source.
When converter proposed by the invention works, converter voltage increasing is expanded using the transformer action of coupling inductance
Benefit, reduces the voltage stress of power switch pipe, reduces the conduction loss of power device.Voltage-multiplying circuit unit is introduced into one
Step improves the voltage gain of circuit and reduces the voltage stress of device；Power switch is realized using the leakage inductance of coupling inductance
The no-voltage of pipe is open-minded, whole switching tubes is all realized Sofe Switch, and the leakage inductance energy for absorbing is eventually transferred to load, realizes
Lossless Snubber.It is an advantage of the invention that simple structure, easy to control, noenergy losser in circuit can improve the effect of circuit
Rate.Coupling inductance all transmits energy when corresponding switching tube is turned on and off, and improves the utilization rate of coupling inductance, reduces
The volume of coupling inductance.Converter realizes that two photovoltaic modulies are input into simultaneously, and two photovoltaic modulies can negative pole ground connection,
The high-voltage problem that series connection brings is avoided, the film assembly mixing that the converter is especially suitable for the crystal silicon component and high pressure of low pressure makes
Situation.The converter can also be realized being input into while a photovoltaic module and a battery, to ensure the flat of power
Steady output, solves photovoltaic system big problem affected by environment.Light of the present invention suitable for small-power, high efficiency and stabilization output
Photovoltaic grid-connected conversion occasion.
Brief description of the drawings
Fig. 1 is circuit diagram of the invention.
Specific embodiment
Referring to Fig. 1, the dual power supply input direct-current-DC converter suitable for photovoltaic generation occasion of the invention, coupling
The first end of the first winding of inductance L1 is connected with the positive pole of the first power supply Vin1, the first winding L1The second end and power switch pipe
The drain electrode of S and the source electrode of clamp switch pipe Sc are connected, and the drain electrode of clamp switch pipe Sc is connected with the first end of clamping capacitance Cc, work(
The source electrode of rate switching tube S is connected with the negative pole at second end of clamping capacitance Cc and the first power supply Vin1.
The first end of the second winding of coupling inductance L2 is connected with the drain electrode of power switch tube S, the second winding of coupling inductance L2
The second end be connected with a times first end of voltage capacitance Cm, second end of times voltage capacitance Cm is connected with the anode of output diode Do,
The negative electrode of output diode Do is connected with the first end of output capacitance Co and the first end of load resistance Ro, and the of output capacitance Co
Two ends are connected with second end of load resistance Ro and the negative pole of the first power supply Vin.
The positive pole of second source Vin2 is connected with the anode of sustained diode r, negative electrode and the output two of sustained diode r
The anode of pole pipe Do is connected, and the negative pole of second source Vin2 is connected with the negative pole of the first power supply Vin1.
One or two Wei photovoltaic module or battery in first power supply Vin1 and second source Vin2.
There are four kinds of works in a switch periods suitable for the dual power supply input direct-current-DC converter of photovoltaic generation occasion
Make process, i.e. power switch tube S conducting state, power switch tube S is turned off and the commutation course between clamp switch pipe Sc conductings,
Clamp switch pipe Sc conducting states, clamp switch pipe Sc turns off and opens the commutation course between rate switching tube S conductings
Power switch tube S conducting state：Now clamp switch pipe Sc and output diode Do is off state.By first
Power supply Vin1 charges to magnetizing inductance, is charged to voltage capacitance Cm again from second source and the first power supply are common.Now power switch
The electric current of pipe includes two parts, i.e. the first winding current and the second winding current.
Power switch tube S is turned off and the commutation course between clamp switch pipe Sc conductings：When power switch tube S is turned off, electricity
Stream can be charged by the body diode of clamp switch pipe Sc to clamping capacitance Cc, and shut-off voltage is clamped electric capacity and is clamped, therefore
Shut-off due to voltage spikes will not be produced in power switch tube S.Signal will be opened afterwards being added on the gate pole of clamp switch pipe Sc makes it
Open-minded, the no-voltage for realizing switching tube is open-minded.The electric current of sustained diode r can quickly fall to zero.
Clamp switch pipe Sc conducting states：Afterwards, resonance is formed by clamping capacitance Cc, times voltage capacitance Cm, leakage inductance, in resonance
During, the voltage of clamping capacitance Cc persistently rises, and output diode Do can to a certain extent turned on, and starts to be passed to load
Pass energy.There is magnetizing inductance to continue to be shifted to output capacitance Co with the energy in times voltage capacitance Cm.After a period of time, clamp electricity
Hold after voltage reaches peak value and begin to decline, the leakage inductance electric current of coupling inductance is reverse.
Clamp switch pipe Sc turns off and opens the commutation course between rate switching tube S conductings：To the gate pole of clamp switch pipe Sc
Apply cut-off signals to turn it off, then by main switch afterflow, Continuity signal is now applied again to be made electric current to power switch tube S
Its is open-minded, realizes the Sofe Switch process that no-voltage is opened.
The steady-working state of initial power switching tube S conductings has been returned to afterwards.
The electricity of the first power supply Vin1 and second is determined by adjusting the turn ratio of coupling inductance with the dutycycle of power switch tube S
Source Vin2 goes out the ratio of energy, when power output is constant, when dutycycle is tuned up, and the first power supply Vin1 output energy proportions
Rise and electric second source Vin2 outputs energy decline.Otherwise when dutycycle is turned down, the first power supply Vin1 output energy proportions
Decline and second source Vin2 output energy risings；When the change of the coupling inductance turn ratio is big, the first power supply Vin1 output energy proportions
Rise, conversely, when the coupling inductance turn ratio becomes hour, the first power supply Vin1 output energy proportions decline.
From the adaptation of voltage, the first power supply is applied to crystal silicon photovoltaic battery or battery, and second source is most suitably used
In film photovoltaic cell.
Claims (2)
1. a kind of dual power supply input direct-current-DC converter suitable for photovoltaic generation occasion, it is characterised in that：
The first end of the winding of coupling inductance first (L1) is connected with the positive pole of the first power supply (Vin1), the first winding (L1) second
End is connected with the drain electrode of power switch pipe (S) and the source electrode of clamp switch pipe (Sc), drain electrode and the clamp of clamp switch pipe (Sc)
The first end of electric capacity (Cc) is connected, the source electrode of power switch pipe (S) and the second end of clamping capacitance (Cc) and the first power supply
(Vin1) negative pole is connected；
The first end of the winding of coupling inductance second (L2) is connected with the drain electrode of power switch pipe (S), the winding of coupling inductance second
(L2) the second end is connected with the first end of a times voltage capacitance (Cm), the second end and the output diode (Do) of times voltage capacitance (Cm)
Anode is connected, the negative electrode of output diode (Do) and the first end of output capacitance (Co) and the first end phase of load resistance (Ro)
Even, the second end of output capacitance (Co) is connected with the negative pole at the second end of load resistance (Ro) and the first power supply (Vin1)；
The positive pole of second source (Vin2) is connected with the anode of fly-wheel diode (Dr), negative electrode and the output of fly-wheel diode (Dr)
The anode of diode (Do) is connected, and the negative pole of second source (Vin2) is connected with the negative pole of the first power supply (Vin1).
2. the dual power supply input direct-current-DC converter suitable for photovoltaic generation occasion according to claim 1, its feature
It is：One or two Wei photovoltaic module or battery in first power supply (Vin1) and second source (Vin2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510001796.7A CN104506036B (en) | 2015-01-04 | 2015-01-04 | Suitable for the dual power supply input direct-current DC converter of photovoltaic generation occasion |
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| CN201510001796.7A CN104506036B (en) | 2015-01-04 | 2015-01-04 | Suitable for the dual power supply input direct-current DC converter of photovoltaic generation occasion |
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| CN104506036A CN104506036A (en) | 2015-04-08 |
| CN104506036B true CN104506036B (en) | 2017-05-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105896974A (en) * | 2016-06-15 | 2016-08-24 | 盐城工学院 | High-gain direct-current voltage-boosting conversion circuit |
| EP3893371A4 (en) | 2019-01-04 | 2021-12-01 | Huawei Technologies Co., Ltd. | Dcdc converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201699584U (en) * | 2010-06-22 | 2011-01-05 | 上海寅稞电子科技有限公司 | High efficiency step-up converter for solar distributed power generation |
| CN103281013A (en) * | 2013-06-20 | 2013-09-04 | 上海电机学院 | Photovoltaic power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7889519B2 (en) * | 2006-01-12 | 2011-02-15 | Massachusetts Institute Of Technology | Methods and apparatus for a resonant converter |
| CN100446390C (en) * | 2007-03-05 | 2008-12-24 | 浙江大学 | Active clamp zero voltage soft switch high gain booster staggered parallel converter |
| CN100581033C (en) * | 2008-03-14 | 2010-01-13 | 浙江大学 | Active-clamp high-gain alternation and parallel connection boosting converter |
| 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 |
| CN103780086B (en) * | 2014-01-23 | 2015-12-23 | 江苏杰瑞科技集团有限责任公司 | Based on the dual output bus type high-gain converter of coupling inductance times laminated structure |
| CN204392084U (en) * | 2015-01-04 | 2015-06-10 | 无锡市产品质量监督检验中心 | Be applicable to the duplicate supply input direct-current-DC converter of photovoltaic generation occasion |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201699584U (en) * | 2010-06-22 | 2011-01-05 | 上海寅稞电子科技有限公司 | High efficiency step-up converter for solar distributed power generation |
| CN103281013A (en) * | 2013-06-20 | 2013-09-04 | 上海电机学院 | Photovoltaic power supply system |
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Effective date of registration: 20221109 Address after: 214101 No. 8, Dongting Chunxin East Road, Xishan District, Wuxi City, Jiangsu Province Patentee after: Wuxi inspection and Certification Institute Address before: 214000 No.8 Chunxin East Road, Dongting, Xishan District, Wuxi City, Jiangsu Province Patentee before: WUXI PRODUCT QUALITY SUPERVISION AND INSPECTION INSTITUTE |
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