CN207968046U - A kind of maximum power point tracking system and photovoltaic charging system - Google Patents

Abstract

The utility model is related to solar control technical field, a kind of maximum power point tracking system and photovoltaic charging system are provided.Wherein, the maximum power point tracking system includes input capacitance, booster circuit, output capacitance and inverter circuit；The input capacitance, the booster circuit and output capacitance are connected in parallel, and the output capacitance is connect with the inverter circuit；The anode of the input capacitance with the cathode output end of photovoltaic module for connecting, and the cathode of the input capacitance with the cathode output end of photovoltaic module for connecting；The booster circuit includes the first boost module and the second boost module, and first boost module is connected in parallel with second boost module；The inverter circuit is single-phase full bridge structure.It can realize the voltage stress and current stress for reducing circuit components, reduce fever, raising efficiency.

Description

A kind of maximum power point tracking system and photovoltaic charging system

【Technical field】

The utility model embodiment is related to solar control technical field more particularly to a kind of maximum power point tracking system And photovoltaic charging system.

【Background technology】

MPPT maximum power point tracking (Maximum Power Point Tracking, abbreviation MPPT) system is that one kind passing through tune The working condition for saving electrical module, enables the electrical system that photovoltaic panel exports more electric energy that can send out solar panel Direct current be effectively utilized.MTTP systems are capable of the generating voltage of detecting real-time solar panels, and track ceiling voltage, Current value makes system charge to accumulator with maximum power output.

Currently, the maximum power point tracking system in industry generally uses the Boost circuit of single channel, Boost boostings The voltage stress and current stress of the circuit components such as capacitance, inductance and switching tube in circuit are all larger, larger voltage stress Cause calorific value to increase with current stress, thereby reduces transfer efficiency, or even breakdown circuit components, influence the normal of product Work.

【Utility model content】

In order to solve the above-mentioned technical problem, the utility model embodiment provide it is a kind of reduce circuit components voltage answer Power and current stress reduce fever, the maximum power point tracking system and photovoltaic charging system of raising efficiency.

In order to solve the above technical problems, the utility model embodiment provides following technical scheme：

The utility model embodiment provides a kind of maximum power point tracking system, including including input capacitance, boosting electricity Road, output capacitance and inverter circuit；

The input capacitance, the booster circuit and output capacitance are connected in parallel, and the output capacitance and the inversion Circuit connects；

The anode of the input capacitance for being connect with the cathode output end of photovoltaic module, use by the cathode of the input capacitance It is connect in the cathode output end with photovoltaic module；The booster circuit includes the first boost module and the second boost module, described First boost module is connected in parallel with second boost module；

The inverter circuit is single-phase full bridge structure.

Optionally, first boost module includes power inductance L1, switching tube Q1 and diode D3；

One end of the power inductance L1 connects the anode connection of the input capacitance, and the other end connects the switch The drain electrode of pipe Q1 and the anode of the diode D3；

The grid of the switching tube Q1 is the driving input terminal of first boost module, the source electrode of the switching tube Q1 Connect the cathode of the input capacitance；

The cathode of the diode D3 connects the anode of the output capacitance.

Optionally, second boost module includes power inductance L2, switching tube Q2 and diode D4；

One end of the power inductance L2 connects one end of the power inductance L1, and the other end connects the switching tube The drain electrode of Q2 and the anode of the diode D4；

The grid of the switching tube Q2 is the driving input terminal of second boost module, the source electrode of the switching tube Q2 Connect the cathode of the input capacitance and the cathode of output capacitance；

The cathode of the diode D4 connects the anode of the output capacitance.

Optionally, the switching tube Q1 and switching tube Q2 is silicon carbide MOSFET；The diode D3 and diode D4 For silicon carbide diode.

Optionally, the inverter circuit is partly led by Metal-Oxide Semiconductor field-effect transistor Q3, metal-oxide Body field-effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 and metal-oxide semiconductor field effect are brilliant The bridge architecture circuit of body pipe Q6 compositions；

The inverter circuit further includes RC absorbing circuits, RCD absorbing circuits or C absorbing circuits, the RC absorbing circuits, RCD absorbing circuits or C absorbing circuits are connected across the Metal-Oxide Semiconductor field-effect transistor Q3, metal-oxide half Conductor field-effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect are brilliant In body pipe Q6 between any two Metal-Oxide Semiconductor field-effect transistor, partly led for absorbing the metal-oxide Body field-effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, Metal-Oxide Semiconductor field effect transistor The Reverse recovery wave of surge voltage and fly-wheel diode when pipe Q5 or Metal-Oxide Semiconductor field-effect transistor Q6 are turned off Voltage is gushed, and reduces the Metal-Oxide Semiconductor field-effect transistor Q3, Metal-Oxide Semiconductor field effect transistor The switch of pipe Q4, Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect transistor Q6 damage Consumption.

Optionally, the maximum power point tracking system includes AC reactor, protects circuit or exchange EMC filters, The AC reactor is connect with the inverter circuit, and the protection circuit is connect with the AC reactor, the exchange EMC Filter is connect with the protection circuit.

Optionally, the maximum power point tracking system further includes direct current EMC filters, the direct current EMC filters Both ends are connect with the cathode output end of the photovoltaic module and cathode output end respectively.

Optionally, the maximum power point tracking system further includes level-one filter circuit, and the level-one filter circuit includes Filter inductance L3 and filter inductance L4, two output ends of the inverter circuit respectively with the filter inductance L3 and filter inductance L4 connections.

Optionally, the level-one filter circuit further includes filter inductance L3 and resistance R1, the filter inductance L3 and resistance R1 is connected on the L lines of power grid.

The utility model embodiment additionally provides a kind of photovoltaic charging system, including

Photovoltaic module；

Maximum power point tracking system as described in any one of the above embodiments, the maximum power point tracking system and the photovoltaic Component connects；

Accumulator, the accumulator are connect with the maximum power point tracking system；

Processing unit, the processing unit are connect with the maximum power point tracking system；

Power regulator module, the power regulator module are connect with the processing unit.

The utility model has the beneficial effects that：Compared with prior art, the utility model embodiment provides one kind most High-power tracking system and photovoltaic charging system.By using the boosting electricity including the first boost module and the second boost module Road, wherein first boost module is connected in parallel with second boost module.It can realize the electricity for reducing circuit components Compression and current stress reduce fever, raising efficiency.

【Description of the drawings】

One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes Non- to have special statement, composition does not limit the figure in attached drawing.

Fig. 1 is a kind of photovoltaic charging system functional block diagram that the utility model embodiment provides；

Fig. 2 is a kind of maximum power point tracking system functional block diagram that the utility model embodiment provides；

Fig. 3 is a kind of maximum power point tracking system functional block diagram that another embodiment of the utility model provides；

Fig. 4 is a kind of maximum power point tracking system functional block diagram that the utility model still another embodiment provides；

Fig. 5 is a kind of maximum power point tracking system functional block diagram that the utility model still another embodiment provides；

Fig. 6 is a kind of boost circuit structure schematic diagram that the utility model embodiment provides；

Fig. 7 is a kind of structural schematic diagram for inverter circuit that the utility model embodiment provides；

Fig. 8 is a kind of structural schematic diagram for level-one filter circuit that the utility model embodiment provides；

Fig. 9 is a kind of structural schematic diagram for level-one filter circuit that another embodiment of the utility model provides；

Figure 10 is a kind of RCD absorbing circuits structural schematic diagram that the utility model embodiment provides；

Figure 11 is a kind of RCD absorbing circuits structural schematic diagram that another embodiment of the utility model provides.

【Specific implementation mode】

For the ease of understanding the application, with reference to the accompanying drawings and detailed description, the application is carried out in more detail It is bright.It should be noted that when element is expressed " being fixed on " another element, it can directly on another element or May exist one or more elements placed in the middle therebetween.When an element is expressed " connection " another element, it can be straight It is connected to another element in succession or may exist one or more elements placed in the middle therebetween.Term used in this specification The orientation or position of the instructions such as " vertically ", " horizontal ", "left", "right", "upper", "lower", "inner", "outside", " middle part ", " tail portion " It is to be based on the orientation or positional relationship shown in the drawings to set relationship, is merely for convenience of description the application and simplifies to describe, rather than Indicate or imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore cannot It is interpreted as the limitation to the application.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating Or imply relative importance.

Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model The normally understood meaning of technical staff in art field is identical.Term used in the description of the utility model is intended merely to The purpose for describing specific embodiment is not intended to limitation the utility model.Term "and/or" packet used in this specification Include any and all combinations of one or more relevant Listed Items.

In addition, as long as technical characteristic involved in the application difference embodiment disclosed below is not constituted each other Conflict can be combined with each other.

Referring to Fig. 1, Fig. 1 is a kind of photovoltaic charging system functional block diagram that the utility model embodiment provides.Such as Fig. 1 institutes Show, the photovoltaic charging system 100 includes photovoltaic module 10, accumulator 20, maximum power point tracking system 200, main control module The external monitoring module such as 300 and infrared module 40.The photovoltaic charging system 100 includes off-network electricity generation system, generates electricity by way of merging two or more grid systems System and distributed generation system etc..

The photovoltaic module 10 is that direct current electricity output can be provided separately, and minimum indivisible photovoltaic cell group attaches together It sets, also referred to as solar panel, is the pith of the photovoltaic charging system 100, specific form is by several monomers It is tightly packaged into component after battery series connection and/or parallel connection.The solar panel of the photovoltaic module 10 is mostly monocrystalline silicon, polysilicon, non- The materials such as crystal silicon can also be the material that opto-electronic conversion may be implemented of other some multiple elements compositions, such as chemistry dye Expect solar panel.The outer enclosure material of the photovoltaic module 10 is stainless steel, aluminium or other nonmetallic materials.In some realities It applies in example, the front of the photovoltaic module 10 is tempered glass, and the back side of the photovoltaic module 10 is protection backboard, the backboard Effect be sealing, insulation, waterproof etc., the such as waterproof resin etc. with higher anti-aging grade may be used in the backboard.

The photovoltaic module 10 is arranged according to the connection of grouping array, is typically mounted at sunshine abundance, and mankind's activity is less, Region wide place, such as outlying highlands, roof etc., can also realize civilian or commercial use, such as photovoltaic electric It stands, traffic lights, solar telephone etc..

The effect of the accumulator 20 is that the electric energy for being converted the photovoltaic module 10 in the case where there is illumination stores Get up, is released for the uses such as other equipment or circuit power grid dilute when needs.It is common, plumbic acid maintenance-free can be used to store Four kinds of battery, common lead-acid accumulator, colloid storage battery or alkaline nickel-cadmium storage battery batteries are used for the photovoltaic charging system 100 In.

Referring to Fig. 2, Fig. 2 is a kind of maximum power point tracking system functional block diagram that the utility model embodiment provides. As shown in Fig. 2, maximum power point tracking system 200 includes input capacitance 21, booster circuit 22, output capacitance 23 and inversion Circuit 24.The input capacitance 21, the booster circuit 22 and output capacitance 23 are connected in parallel, and the output capacitance 23 and institute Inverter circuit 24 is stated to be connected in parallel.

The anode of the input capacitance 21 is used to connect with the cathode output end of photovoltaic module 10, the input capacitance 21 Cathode with the cathode output end of photovoltaic module 10 for connecting.The input capacitance 21 is for filtering out 10 photoelectricity of the photovoltaic module Higher hamonic wave in transformed direct current, it is of course also possible to use described in other DC filtering circuit replacement circuits Input capacitance 21.

One end of the booster circuit 22 connects the anode of the input capacitance 21, the other end of the booster circuit 22 Connect the cathode of the input capacitance 21.In the present embodiment, the booster circuit 22 is Boost circuit, described Boost circuit is switch DC booster circuit, it will be understood that the booster circuit 22 can be arbitrary combination and circuit shape The booster circuit of formula.

The anode of the output capacitance 23 connects one end of the booster circuit 22, and the cathode of the output capacitance 23 connects Connect the other end of the booster circuit 22.Two processes are charged and discharged since the booster circuit 22 has, in the two mistakes The tie point of journey, the i.e. moment of switching, will produce some peak voltages and electric current, and the output capacitance 23 is exactly for filtering Clutter except harmonic wave and due to switch motion generation.It is appreciated that the present embodiment is not limited to the filtering of single output capacitance 23 Circuit, the output capacitance 23 can also use some other filter circuit to substitute.

One end of the inverter circuit 24 connects the anode of the output capacitance 23, the other end of the inverter circuit 24 Connect the cathode of the output capacitance 23.The inverter circuit 24 is corresponding with rectification circuit, can become to exchange by direct current Electricity, when the exchange side of the inverter circuit 24 is connected to power grid, then referred to as active inversion, when the exchange of the inverter circuit 24 Side is directly connected with load, then referred to as passive inverter.

Referring to Fig. 3, Fig. 3 is a kind of maximum power point tracking system principle frame that another embodiment of the utility model provides Figure.As shown in figure 3, the booster circuit 22 includes the first boost module 221 and the second boost module 222, first boosting Module 221 is connected in parallel with second boost module 222.Specifically, described in one end connection of first boost module 221 The other end connection of one end of input capacitance 21 and second boost module 222, first boost module 221 is described defeated Go out the other end of capacitance 23 and second boost module 222.In some embodiments, the booster circuit 22 is not limited to this reality Several grades of boostings in parallel may be used according to actual voltage output demand in the boost module for applying described two-stage parallel connection Module.

Compared to the booster circuit generally used in current photovoltaic charging system, the booster circuit 22 is as a result of friendship Wrong first boost module 221 in parallel and second boost module 222, can reduce the electronics of the booster circuit 22 The voltage stress and current stress of component, the reduction based on voltage stress and current stress, it is possible to reduce the booster circuit The calorific value of 22 electronic component can further promote the delivery efficiency of the maximum power point tracking system 200.

Referring to Fig. 4, Fig. 4 is a kind of maximum power point tracking system principle that the utility model still another embodiment provides Block diagram.As shown in figure 4, the maximum power point tracking system 200 includes AC reactor 25, protection circuit 26 and exchanges EMC Filter 27, the AC reactor 25 are connect with the inverter circuit 24, the protection circuit 26 and the AC reactor 25 connections, exchange EMC filters 27 are connect with the protection circuit 26.

Wherein, the AC reactor 25 is in ac circuit, i.e. the exchange side of the inverter circuit 24.Generally, institute Stating AC reactor 25 is divided into single-phase and three-phase, the AC reactor 25 to be mainly used for reducing the output of the inverter circuit 24 Harmonic wave, surge and peak point current, improve the anti-interference of low-frequency transduction, improve power factor (PF) and prevent voltage spikes Caused tripping etc..The protection circuit 26 is for preventing due to voltage or electric current is excessive burns fuse, or even causes part Circuit catching fire etc., the protection circuit 26 can be reversed Schottky diode or metal-oxide-semiconductor and other components composition Protect circuit, or relay protection.The exchange EMC filters 27 are connected across between phase line, for filtering out difference Electromagnetic interference and spark interference that mould signal interference, grounding interference and various inductive loads generate during switching electricity etc..It can To understand, the maximum power point tracking system 200 may include the AC reactor 25, protection circuit 26 or exchange EMC It is one or more in filter 27.

Referring to Fig. 5, Fig. 5 is a kind of maximum power point tracking system principle that the utility model still another embodiment provides Block diagram.As shown in figure 5, the maximum power point tracking system 200 further includes direct current EMC filters 28, the direct current EMC filters The both ends of wave device 28 are connect with the cathode output end of the photovoltaic module 10 and cathode output end respectively.

Referring to Fig. 6, Fig. 6 is a kind of boost circuit structure schematic diagram that the utility model embodiment provides.Such as Fig. 6 institutes Show, first boost module 221 includes power inductance L1, switching tube Q1 and diode D3.

One end of the power inductance L1 connects the anode connection of the input capacitance 21, and is opened described in other end connection Close drain electrode and the anode of the diode D3 of pipe Q1；The grid of the switching tube Q1 is the drive of first boost module 221 The source electrode of dynamic input terminal DRV1, the switching tube Q1 connect the cathode of the input capacitance 21；The cathode of the diode D3 connects Connect the anode of the output capacitance 23.Optionally, two poles there are one being connected in parallel between the source electrode and drain electrode of the switching tube Q1 Pipe D1, the diode D1 are carried in the technical process of the switching tube Q1, not actually true visible two Pole pipe.First boost module 221 controls the logical of the switching tube Q1 by the duty ratio of the driving input terminal DRV1 It is disconnected.

The power inductance L1 be used for when the switching tube Q1 in closed state when, convert electrical energy into magnetic field energy, when The switching tube Q1 in the on-state when, magnetic field energy is converted to the voltage superposition of electric energy and input power, it is defeated after filtered Go out to load；The open and close of the switching tube Q1 are controlled by pulse-width modulation circuit；The diode D1 is for reducing the switching tube The open and close of Q1 are lost, and prevent the switching tube Q1 reverse breakdowns；The diode D3 is used to be closed as the switching tube Q1 When under state, the cathode voltage of the diode D3 is higher than cathode voltage, in the state reversely ended.

Second boost module 222 includes power inductance L2, switching tube Q2 and diode D4.The power inductance L2's One end connects one end of the power inductance L1, and the other end connects the drain electrode of the switching tube Q2 with the diode D4's Anode；The grid of the switching tube Q2 is the driving input terminal DRV2 of second boost module 222, the source of the switching tube Q2 Pole connects the cathode of the input capacitance 21 and the cathode of output capacitance 23；The cathode of the diode D4 connects the output The anode of capacitance 23.Second boost module 222 controls the switch by the duty ratio of the driving input terminal DRV2 The break-make of pipe Q2.

Since second boost module 222 and first boost module 221 are in respective internal circuit configuration and company It connects and is consistent in relationship, so, the effect of each circuit components and specific work process in second boost module 222 It repeats no more here.

In the present embodiment, the switching tube Q1 and switching tube Q2 is silicon carbide MOSFET；The diode D3 and two Pole pipe D4 is silicon carbide diode.Other common silicon device smallers of the loss ratio of silicon carbide device, corresponding calorific value smaller, Requirement to radiator is also lower.Simultaneously as silicon carbide device has excellent switching characteristic, it can suitably lifting switch Frequency reduces the volume of filter inductance, on the other hand can generate lower electromagnetic interference, required EMC inductance is also smaller, can To effectively reduce the volume of the maximum power point tracking system 200.

Referring to Fig. 7, Fig. 7 is a kind of structural schematic diagram for inverter circuit that the utility model embodiment provides.Such as Fig. 7 institutes Show, the inverter circuit 24 is made of single-phase complete 4 Metal-Oxide Semiconductor field-effect transistors Q3, Q4, Q5 and Q6 Bridge structural circuit, the inverter circuit 24 by the photovoltaic module 10 convert and also through the booster circuit 22 boosting after it is straight Galvanic electricity is converted into the alternating current that can be used for electrical grid transmission or used for electrical equipment.In some embodiments, the inversion electricity Road 24 can be other inverter circuit structures, such as three phase full bridge structure, I GBT inverter modules etc..

The booster circuit 22 can regard being composed for two half-bridge circuits, two pairs of bridge arms as altogether there are four bridge arm Alternate conduction 180 degree, the output voltage and current waveform of the booster circuit 22 are consistent with the shape of half-bridge circuit, but amplitude is high Go out one times.In this case, to change the virtual value of output AC voltage can only be exported by changing the output capacitance 23 DC voltage Ud realize.

Fig. 8 and Fig. 9 are please referred to, as shown in figure 8, the maximum power point tracking system 200 further includes level-one filter circuit 241, the level-one filter circuit 241 includes filter inductance L3 and filter inductance L4, two output ends of the inverter circuit 24 It is connect respectively with the filter inductance L3 and filter inductance L4.As shown in figure 9, the level-one filter circuit 242 further includes filtering Inductance L3 and resistance R1, the filter inductance L3 and resistance R1 are connected on the L lines of power grid.It is appreciated that the maximum power The filter circuit of point tracking system 200 can be multistage, and the filter circuit and connection for being also not limited to the present embodiment description close System, such as can also be resonance circuit or other filter circuits etc..

Referring to Fig. 10, Figure 10 is a kind of RCD absorbing circuits structural schematic diagram that the utility model embodiment provides.It is described Inverter circuit 24 further includes RC absorbing circuits, RCD absorbing circuits or C absorbing circuits, the RC absorbing circuits, RCD absorbing circuits Or C absorbing circuits are connected across the Metal-Oxide Semiconductor field-effect transistor Q3, Metal-Oxide Semiconductor field respectively Effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect transistor Q6 Between middle any two metal-oxide semiconductor field effect transistor, for absorbing the Metal-Oxide Semiconductor field Effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 Or the Reverse recovery surge electricity of the surge voltage and fly-wheel diode when the Q6 shutdowns of Metal-Oxide Semiconductor field-effect transistor Pressure, and reduce the Metal-Oxide Semiconductor field-effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, The switching loss of Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect transistor Q6.

As shown in Figure 10, since single-phase full bridge structure is symmetrical structure, so the present embodiment is by taking half-bridge structure as an example, it is described RCD absorbing circuits include anode and the metal-oxide half of diode D9, resistance R2, capacitance C3, the diode D9 The drain electrode of conductor field-effect transistor Q6 connects, the one end and the capacitance of the cathode of the diode D9 with the resistance R2 One end of C3 connects, and the other end of the resistance R2 and the drain electrode of the Metal-Oxide Semiconductor field-effect transistor Q6 connect It connects, the other end of the capacitance C3 is connect with the source electrode of the Metal-Oxide Semiconductor field-effect transistor Q5.

It is a kind of RCD absorbing circuits structural schematic diagram that another embodiment of the utility model provides to please refer to Fig.1 1, Figure 11. As shown in figure 11, since single-phase full bridge structure is symmetrical structure, so the present embodiment, by taking half-bridge structure as an example, the RCD absorbs Circuit includes diode D10, diode D11, resistance R3, resistance R4, capacitance C4 and capacitance C5.The anode of the diode D10 It is connect with one end of the capacitance C4 and the resistance R4, cathode and the metal-oxide of the diode D10 are partly led The source electrode of body field-effect transistor Q6 connects, and the other end of the capacitance C4 is brilliant with the Metal-Oxide Semiconductor field-effect The drain electrode of body pipe Q6 connects, the source of the other end of the resistance R4 and the Metal-Oxide Semiconductor field-effect transistor Q5 Pole connects；The anode of the diode D11 is connect with one end of the capacitance C5 and the resistance R3, the diode D11's Cathode is connect with the source electrode of the Metal-Oxide Semiconductor field-effect transistor Q5, the other end of the capacitance C5 with it is described The drain electrode of Metal-Oxide Semiconductor field-effect transistor Q6 connects, the other end and the metal-oxide of the resistance R3 The drain electrode of semiconductor field effect transistor Q5 connects.

The main control module 300 includes processing unit 30, power regulator module 31, debugging interface unit 32, usb communication Unit 33, storage unit 34, LED display unit 35 and temperature detecting unit 36.Power regulator module 31 and the maximum work Rate point tracking system 200 connects, and the debugging interface unit 32 is connect with the processing unit 30, the usb communication unit 33 It is connect with the processing unit 30, the storage unit 34 is connect with the processing unit 30, the LED display unit 35 and institute The connection of processing unit 30 is stated, the temperature detecting unit 36 is connect with the processing unit 30.

The infrared module 40 is connect with the processing unit 30, for monitoring the processing unit 30.

Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations； Under the thinking of the utility model, it can also be combined between the technical characteristic in above example or different embodiments, Step can be realized with random order, and there are many other variations of different aspect present invention as described above, for letter Bright, they are not provided in details；Although the utility model is described in detail with reference to the foregoing embodiments, this field Those of ordinary skill should understand that：Its still can with technical scheme described in the above embodiments is modified, or Equivalent replacement of some of the technical features；And these modifications or replacements, do not make the essence of corresponding technical solution de- Range from various embodiments of the utility model technical solution.

Claims (10)

1. a kind of maximum power point tracking system, which is characterized in that including input capacitance, booster circuit, output capacitance and inversion Circuit；

The input capacitance, the booster circuit and output capacitance are connected in parallel, and the output capacitance and the inverter circuit Connection；

The anode of the input capacitance for connect with the cathode output end of photovoltaic module, the cathode of the input capacitance for The cathode output end of photovoltaic module connects；The booster circuit include the first boost module and the second boost module, described first Boost module is connected in parallel with second boost module；

The inverter circuit is single-phase full bridge structure.

2. maximum power point tracking system according to claim 1, which is characterized in that first boost module includes work( Rate inductance L1, switching tube Q1 and diode D3；

One end of the power inductance L1 connects the anode connection of the input capacitance, and the other end connects the switching tube Q1 Drain electrode and the diode D3 anode；

The grid of the switching tube Q1 is the driving input terminal of first boost module, and the source electrode of the switching tube Q1 connects institute State the cathode of input capacitance；

The cathode of the diode D3 connects the anode of the output capacitance.

3. maximum power point tracking system according to claim 2, which is characterized in that second boost module includes work( Rate inductance L2, switching tube Q2 and diode D4；

One end of the power inductance L2 connects one end of the power inductance L1, and the other end connects the switching tube Q2's The anode of drain electrode and the diode D4；

The grid of the switching tube Q2 is the driving input terminal of second boost module, and the source electrode of the switching tube Q2 connects institute State the cathode of input capacitance and the cathode of output capacitance；

The cathode of the diode D4 connects the anode of the output capacitance.

4. maximum power point tracking system according to claim 3, which is characterized in that the switching tube Q1 and switching tube Q2 It is silicon carbide MOSFET；The diode D3 and diode D4 is silicon carbide diode.

5. maximum power point tracking system according to claim 1, which is characterized in that the inverter circuit is by metal-oxygen Compound semiconductor field effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, Metal-Oxide Semiconductor field The bridge architecture circuit of effect transistor Q5 and Metal-Oxide Semiconductor field-effect transistor Q6 compositions；

The inverter circuit further includes RC absorbing circuits, RCD absorbing circuits or C absorbing circuits, and the RC absorbing circuits, RCD inhale It receives circuit or C absorbing circuits is connected across the Metal-Oxide Semiconductor field-effect transistor Q3, Metal-Oxide Semiconductor Field-effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect transistor In Q6 between any two Metal-Oxide Semiconductor field-effect transistor, for absorbing the Metal-Oxide Semiconductor field Effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, Metal-Oxide Semiconductor field-effect transistor Q5 Or the Reverse recovery surge electricity of the surge voltage and fly-wheel diode when the Q6 shutdowns of Metal-Oxide Semiconductor field-effect transistor Pressure, and reduce the Metal-Oxide Semiconductor field-effect transistor Q3, Metal-Oxide Semiconductor field-effect transistor Q4, The switching loss of Metal-Oxide Semiconductor field-effect transistor Q5 or Metal-Oxide Semiconductor field-effect transistor Q6.

6. maximum power point tracking system according to claim 1, which is characterized in that the maximum power point tracking system Including AC reactor, protection circuit or exchange EMC filters, the AC reactor is connect with the inverter circuit, described Protection circuit is connect with the AC reactor, and the exchange EMC filters are connect with the protection circuit.

7. maximum power point tracking system according to claim 1, which is characterized in that the maximum power point tracking system Further include direct current EMC filters, the both ends of the direct current EMC filters respectively with the cathode output end of the photovoltaic module and negative Pole output end connection.

8. maximum power point tracking system according to claim 1, which is characterized in that the maximum power point tracking system Further include level-one filter circuit, the level-one filter circuit includes filter inductance L3 and filter inductance L4, the inverter circuit Two output ends are connect with the filter inductance L3 and filter inductance L4 respectively.

9. maximum power point tracking system according to claim 8, which is characterized in that the level-one filter circuit further includes Filter inductance L3 and resistance R1, the filter inductance L3 and resistance R1 are connected on the L lines of power grid.

10. a kind of photovoltaic charging system, which is characterized in that including

Photovoltaic module；

Such as claim 1-9 any one of them maximum power point tracking systems, the maximum power point tracking system with it is described Photovoltaic module connects；

Accumulator, the accumulator are connect with the maximum power point tracking system；

Processing unit, the processing unit are connect with the maximum power point tracking system；

Power regulator module, the power regulator module are connect with the processing unit.