CN202364144U - Bypass diode and bypass DC/DC converter of dual-stage photovoltaic inverter - Google Patents

Bypass diode and bypass DC/DC converter of dual-stage photovoltaic inverter Download PDF

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Publication number
CN202364144U
CN202364144U CN 201120471697 CN201120471697U CN202364144U CN 202364144 U CN202364144 U CN 202364144U CN 201120471697 CN201120471697 CN 201120471697 CN 201120471697 U CN201120471697 U CN 201120471697U CN 202364144 U CN202364144 U CN 202364144U
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CN
China
Prior art keywords
dc
converter
bypass
diode
bypass diode
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CN 201120471697
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Chinese (zh)
Inventor
李剑铎
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上海煦达新能源科技有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects

Abstract

The utility model provides a bypass diode and a bypass DC/DC converter of a dual-stage photovoltaic inverter. A diode or a relay is connected in parallel to a DC/DC converter in the dual-stage photovoltaic inverter to serve as a bypass. When the DC/DC boosting converter is in the bypassed state, a switch element on a bypass channel is always in a conduction state, and the loss is lower than that caused when the DC/DC boosting converter which is in operation or energy directly passes through a Boost inductor and a Boost diode, so that the conversion efficiency is improved. The circuit has stable reliability and convenience in use.

Description

Two-stage photovoltaic DC-to-AC converter bypass diode and bypass DC/DC converter

Technical field

The utility model relates between IC H01L semiconductor device or H02M interchange and the interchange; Between the AC and DC; Or between direct current and the direct current and be used for the power supply or the similar conversion equipment of electric power system; And their control or regulation technology field, particularly a kind of two-stage photovoltaic DC-to-AC converter bypass diode and bypass DC/DC converter.

Background technology

Photovoltaic DC-to-AC converter is the power electronic equipment that a kind of direct current that solar panel is sent converts the alternating current that can insert public electric wire net to.

Photovoltaic combining inverter is as a visual plant of solar power system, and its research work also becomes focus.The basic function of photovoltaic combining inverter is when solar cell output changes in a big way in, can be all the time with high as far as possible efficient the low-voltage DC of its output be changed into the alternating current that matees with electrical network and sends into electrical network.

Because the output meeting of solar cell is along with environmental change, and excursion is bigger,, two kinds of schemes are arranged generally in order to guarantee stable being incorporated into the power networks: the one, adopt DC/AC converter+output boostering transformer; The 2nd, adopt DC/DC booster converter+DC/AC converter.

First kind of scheme is because the outlet side transformer is an Industrial Frequency Transformer, because the problem of volume of transformer and efficient seldom adopts in the combining inverter of middle low power.Most employings is second kind of scheme in the reality, promptly adopts the scheme of DC/DC booster converter+DC/AC converter, owing to still exist the two-stage energy conversion, so whole conversion efficiency efficient is lower than one-level conversion.

General DC/DC booster converter adopts the Boost converter, when the switch transistor T B of Boost converter does not work, if Shu RudianyaVin>Vout, then diode D BThe meeting conducting, electric current can pass through; When the solar cell output voltage is higher than the dc voltage value of DC/AC converter job requirement, can let the switch transistor T of Boost converter BQuit work, let electric current pass through the Boost inductance L BAnd D BFlow to dc bus and DC/AC inverter.At this moment just has only the Boost inductance L BWith diode D BOn have loss, this loss during than the work of whole Boost converter is little, though conversion efficiency can be increased, still limited, reach desired value far away.

In the publication document, indivedual related art scheme are arranged also, but can not directly use, like the bypass diode module of number of patent application 200820215148 solar power generation assemblies.What relate to is the circuit original paper of device of solar generating.Comprise aluminium matter box body, copper frame sheet, at least two diode chip for backlight unit, film dancing; It is characterized in that; Described copper frame sheet comprises the connecting portion portion of terminal outer with being arranged on aluminium matter box body that is arranged in the aluminium matter box body; Corresponding each diode chip for backlight unit of connecting portion is provided with the zone of mutual separation, and the part of each connecting portion is stretched out aluminium matter box body and formed described portion of terminal; The N face of each diode chip for backlight unit is welded on the zone that connecting portion separates each other, does not link to each other each other; Described film dancing one end is welded on the P face of each diode chip for backlight unit, and the other end links to each other with the zone that adjacent connecting portion is separated each other; The other end that is arranged on the most last film dancing links to each other with the sub-portion of least significant end; Be provided with encapsulated epoxy resin glue between copper frame sheet and the aluminium matter box body.

Based on two Boost circuit prime inversion high frequency chain isolated form DC-DC converters, belong to the converters field like number of patent application 201020255605.The circuit topological structure that the utility model proposed comprises: realize the high frequency transformer of two Boost circuit, realization front stage circuits and the late-class circuit isolation and the voltage up-down mapping function of prime invert function, and the rectification circuit of realizing rectification function.

Like 200,910,166,254 1 kinds of small-sized/high efficiency insulating properties bidirectional DC-DC converters of number of patent application.Bidirectional DC-DC converter possesses: (N1, N2) carries out magnetic-coupled transformer (2) to coil; Switching circuit (11,12), the diode (D1) of the switch that is connected in parallel (SW1), smmothing capacitor (C1, C2), control unit (1).This bidirectional DC-DC converter carries out the two-way electric power of giving and accepting between the DC power supply (V1) of the smmothing capacitor that is connected in parallel respectively (C1, C2), (V2).From DC power supply (V1) to DC power supply (V2) when electric power is provided, (SW1) remains on on-state with switch.On the other hand, from DC power supply (V2) to DC power supply (V1) when electric power is provided, (SW1) remains on off-state with switch, to prevent the adverse current from the electric power of DC power supply (V1).

Summary of the invention

The purpose of the utility model provides a kind of two-stage photovoltaic DC-to-AC converter bypass diode and bypass DC/DC converter.

The goal of the invention of the utility model realizes through following technical measures: bypass diode of parallel connection or relay on the DC/DC converter in the two-stage photovoltaic DC-to-AC converter.

The beneficial effect of the utility model is; When the DC/DC booster converter is in by bypass condition; Switch element on the bypass path can be under the state of conducting all the time; The loss meeting is than the work of DC/DC booster converter or energy is directly walked the Boost inductance and the Boost diode is low, thereby conversion efficiency is improved.The reliability of circuit is stable, easy to use.

Description of drawings

The DC/DC booster converter adopts Boost converter basic circuit diagram in Fig. 1 prior art.

Fig. 2 is the utility model structural representation.

Fig. 3 is the bypass diode work sketch map in the utility model.

Embodiment

When the solar cell output voltage is higher than the minimum voltage of DC/AC converter work, the DC/DC booster converter with low-loss circuit bypass, can be improved the conversion efficiency of the part voltage section of photovoltaic combining inverter so greatly.

Bypass diode of parallel connection or relay on the DC/DC converter in the two-stage photovoltaic DC-to-AC converter.That is, in the two-stage photovoltaic DC-to-AC converter on the DC/DC converter diode of parallel connection or relay as bypass.

Below in conjunction with embodiment, further set forth the present invention.

As shown in Figure 2, from the analysis of front, can see:

Technique scheme is on common two-stage photovoltaic DC-to-AC converter basis, increases an energy pathway parallelly connected with the DC/DC converter, and this path can adopt bypass diode to realize; Also can adopt relay to realize; The conduction voltage drop of the bypass diode D that is adopted must be lower than the conduction voltage drop of used Boost diode in the DC/DC booster converter; If adopt relay, the path resistance when requirement is not worked less than the DC/DC booster converter for its conduction impedance so.

At bypass diode D of the other parallel connection of the DC/DC of photovoltaic DC-to-AC converter booster converter, promptly the bypass diode positive pole is connected on the input of DC/DC booster converter, and negative pole is connected on the output of DC/DC booster converter.

Especially, said bypass diode D is except satisfying withstand voltage and can passing through the requirement of electric current, and bypass diode D conduction voltage drop must be less than the Boost diode that uses in the DC/DC booster converter.When being lower than the dc voltage value of DC/AC converter job requirement at the solar cell output voltage, controller can be controlled the DC/DC booster converter and be in working condition, claims that this moment, the operating state of photovoltaic DC-to-AC converter was the Boost state.At this moment, the output end voltage of DC/DC booster converter is higher than input terminal voltage, and bypass diode D is in cut-off state.

On the other hand, when adopting relay to realize, controller needs latching relay to be in the state of disconnection.So the path of energy Flow is: solar cell-DC/DC booster converter-DC/AC converter-electrical network.

Because along with the variation of environmental conditions such as illumination, temperature, under photovoltaic DC-to-AC converter MPPT function, the output voltage of solar cell can change.When the solar cell output voltage is higher than the dc voltage value of DC/AC converter job requirement; Controller can order the DC/DC booster converter to quit work; And if when realizing with relay; Controller also will send the order of relay closes simultaneously, and this moment, the operating state of photovoltaic DC-to-AC converter was a bypass condition.Simultaneously; Because the bypass diode conduction voltage drop is less than Boost diode current flow pressure drop used in the DC/DC booster converter; Impedance when the relay impedance is not worked less than the DC/DC step-up transformer; The path of energy Flow can become: solar cell-bypass diode or bypass relay-DC/AC converter-electrical network, thus realize that the DC/DC booster converter by bypass, reduces the wastage.

Under bypass condition; When the DC/DC booster converter is in by bypass condition; Switch element on the bypass path can be under the state of conducting all the time; The loss meeting is directly walked the low of Boost inductance and Boost diode than work of DC/DC booster converter or energy, thereby conversion efficiency is improved.

These embodiment only are used to explain the present invention, and are not used in restriction scope of the present invention.

Claims (5)

1. two-stage photovoltaic DC-to-AC converter bypass diode and bypass DC/DC converter is characterized in that: bypass diode of parallel connection or relay on the DC/DC converter in the two-stage photovoltaic DC-to-AC converter.
2. two-stage photovoltaic DC-to-AC converter bypass diode as claimed in claim 1 and bypass DC/DC converter, it is characterized in that: the conduction voltage drop of bypass diode D must be lower than the conduction voltage drop of used Boost diode in the DC/DC booster converter.
3. two-stage photovoltaic DC-to-AC converter bypass diode as claimed in claim 1 and bypass DC/DC converter is characterized in that, the path resistance when the relay conduction impedance is not worked less than the DC/DC booster converter.
4. two-stage photovoltaic DC-to-AC converter bypass diode as claimed in claim 1 and bypass DC/DC converter is characterized in that the bypass diode positive pole is connected on the input of DC/DC booster converter, and negative pole is connected on the output of DC/DC booster converter.
5. two-stage photovoltaic DC-to-AC converter bypass diode as claimed in claim 4 and bypass DC/DC converter is characterized in that, bypass diode D conduction voltage drop must be less than the Boost diode that uses in the DC/DC booster converter.
CN 201120471697 2011-11-24 2011-11-24 Bypass diode and bypass DC/DC converter of dual-stage photovoltaic inverter CN202364144U (en)

Priority Applications (1)

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CN 201120471697 CN202364144U (en) 2011-11-24 2011-11-24 Bypass diode and bypass DC/DC converter of dual-stage photovoltaic inverter

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Application Number Priority Date Filing Date Title
CN 201120471697 CN202364144U (en) 2011-11-24 2011-11-24 Bypass diode and bypass DC/DC converter of dual-stage photovoltaic inverter

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578875A (en) * 2014-11-19 2015-04-29 南京信息职业技术学院 Direct-current input circuit for photovoltaic inverter
CN104638971A (en) * 2015-02-13 2015-05-20 河海大学 Photovoltaic grid-connected inverter and control method thereof
CN104660020A (en) * 2013-11-21 2015-05-27 富士电机株式会社 Switching power supply circuit
WO2016008382A1 (en) * 2014-07-15 2016-01-21 阳光电源股份有限公司 Single-stage photovoltaic grid-connected inverter and control method and application thereof
WO2016015243A1 (en) * 2014-07-30 2016-02-04 阳光电源股份有限公司 Photovoltaic grid connection control method and photovoltaic grid connection system
CN106160247A (en) * 2014-10-20 2016-11-23 三星电机株式会社 For wirelessly sending the equipment of electric power
US20170054409A1 (en) * 2014-04-30 2017-02-23 Solarus Sunpower Sweden Ab Photovoltaic thermal hybrid solar collector
CN106602854A (en) * 2015-10-20 2017-04-26 长沙广义变流技术有限公司 Bidirectional chopper
CN106953538A (en) * 2016-11-29 2017-07-14 湘潭大学 It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay
CN107959433A (en) * 2017-12-21 2018-04-24 阳光电源股份有限公司 A kind of inverter and inversion system for suppressing leakage current

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104660020B (en) * 2013-11-21 2018-06-12 富士电机株式会社 Switching power circuit
CN104660020A (en) * 2013-11-21 2015-05-27 富士电机株式会社 Switching power supply circuit
US20170054409A1 (en) * 2014-04-30 2017-02-23 Solarus Sunpower Sweden Ab Photovoltaic thermal hybrid solar collector
WO2016008382A1 (en) * 2014-07-15 2016-01-21 阳光电源股份有限公司 Single-stage photovoltaic grid-connected inverter and control method and application thereof
WO2016015243A1 (en) * 2014-07-30 2016-02-04 阳光电源股份有限公司 Photovoltaic grid connection control method and photovoltaic grid connection system
CN106160247A (en) * 2014-10-20 2016-11-23 三星电机株式会社 For wirelessly sending the equipment of electric power
CN104578875A (en) * 2014-11-19 2015-04-29 南京信息职业技术学院 Direct-current input circuit for photovoltaic inverter
CN104638971B (en) * 2015-02-13 2018-04-03 河海大学 A kind of photovoltaic combining inverter and its control method
CN104638971A (en) * 2015-02-13 2015-05-20 河海大学 Photovoltaic grid-connected inverter and control method thereof
CN106602854A (en) * 2015-10-20 2017-04-26 长沙广义变流技术有限公司 Bidirectional chopper
CN106602854B (en) * 2015-10-20 2019-07-16 长沙广义变流技术有限公司 A kind of two-way chopper
CN106953538A (en) * 2016-11-29 2017-07-14 湘潭大学 It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay
CN107959433A (en) * 2017-12-21 2018-04-24 阳光电源股份有限公司 A kind of inverter and inversion system for suppressing leakage current

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