CN208571927U - Three level Boost circuits of one kind and inversion system - Google Patents
Three level Boost circuits of one kind and inversion system Download PDFInfo
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- CN208571927U CN208571927U CN201821059908.XU CN201821059908U CN208571927U CN 208571927 U CN208571927 U CN 208571927U CN 201821059908 U CN201821059908 U CN 201821059908U CN 208571927 U CN208571927 U CN 208571927U
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Abstract
The utility model discloses three level Boost circuits of one kind and inversion system, three level Boost circuits include third switching tube, and the first end of the third switching tube connects the first node, and the second end of the third switching tube connects the second node；When the Boost circuit works, the third switching tube is disconnected；When the Boost circuit does not work, the third switching tube closure.The circuit is the Boost circuit of anode altogether, pass through the voltage at the second capacitor-clamped second switch both ends, since first switch tube and second switch are connected, first switch tube and second switch bear busbar voltage after series connection, when second switch, which bears voltage, to be clamped, the voltage that the first switch tube of series connection with it is born also is clamped, and therefore, first switch tube and second switch can be made to realize and pressed.
Description
Technical field
The utility model relates to power electronics fields, more particularly to a kind of three level Boost circuits and inversion system.
Background technique
With the growth of energy-consuming, the deterioration of ecological environment and the raising of mankind's environmental consciousness, solar energy is as one
The green energy resource of kind sustainable development and efficient pollution-free, is increasingly taken seriously.There is high development in applied solar energy technology
The technology of future is photovoltaic technology.Photovoltaic technology is a kind of technology for directly converting the solar into electric energy.
Solar energy can be converted to direct current energy using photovoltaic effect by photovoltaic cell, still, due to single light
It is limited to lie prostrate the electric current that battery provides, multiple photovoltaic cells are usually connected and composed into photovoltaic array in practical applications.Photovoltaic array
The direct current of generation need using inverter by DC conversion at alternating current for load use or it is grid-connected.
In order to improve the working range of inverter input voltage, MPPT maximum power point tracking (Maximum Power is improved
Point Tracking, MPPT) efficiency, Boost circuit is used usually in inverter, using Boost circuit by photovoltaic array
Output voltage is supplied to inverter after increasing.
However, the voltage stress of single switching transistor in Boost circuit has when the input voltage of Boost circuit is higher
Limit, it is therefore desirable to using two switching tube series connection, still, in Boost circuit work, how to realize that two switching tubes are pressed then
It is the technical problem that Boost circuit faces.
Utility model content
Of the existing technology in order to solve the problems, such as, the utility model provides three level Boost circuits of one kind and contravariant system
System can be such that two switching tubes receiving voltage realizations in three level Boost circuits press.
To achieve the goals above, the technical scheme that the utility model is provided is as follows:
The utility model provides a kind of three level Boost circuits, comprising: first switch tube, second switch, the first electricity
Sense, the second capacitor, third capacitor, the 4th capacitor, first diode, the second diode and third switching tube；
The input terminal of the Boost circuit connects first capacitor；The first capacitor is connected in parallel on both ends of power；
The first end of the first switch tube connects the anode of the power supply, the second end connection of the first switch tube the
One node；The first end of the second switch connects the first node, and the second end of the second switch passes through described
The cathode of power supply described in first inductance connection；
The first end of the third capacitor connects the anode of the power supply, and the second end of the third capacitor connects the second section
Point；The first end of 4th capacitor connects the second node, and the second end of the 4th capacitor connects the Boost circuit
Output negative pole；
The first end of second capacitor connects the first node, and the second end of second capacitor connects third section
Point；
The anode of the first diode connects the third node, the cathode connection described second of the first diode
The second end of switching tube；The anode of second diode connects the output negative pole of the Boost circuit, second diode
Cathode connect the third node；
The first end of the third switching tube connects the first node, described in the second end connection of the third switching tube
Second node；
When the Boost circuit works, the third switching tube is disconnected；When the Boost circuit does not work, the third
Switching tube closure.
Optionally, when the three level Boosts circuit works, the third switching tube is disconnected, and is specifically included:
When Boost work, if the sum of voltage of the voltage of third capacitor and the 4th capacitor is higher than first capacitor
The voltage of voltage and the second capacitor is then first closed the third switching tube, when the electricity of the second capacitor less than the voltage of the 4th capacitor
Pressure disconnects third switching tube when rising to the voltage of the 4th capacitor.
Optionally, the third switching tube is controlled tr tube.
Optionally, the controlled tr tube are as follows: IGBT, MOSFET, JFET or relay.
Optionally, the third switching tube is the 4th diode；
The anode of 4th diode connects the second node, the cathode connection described first of the 4th diode
Node.
Optionally, the period of the corresponding driving signal of the first switch tube and second switch is identical.
Optionally, the on state of the first switch tube and second switch is interlaced.
Optionally, the first switch tube is identical with the duty ratio of second switch.
Optionally, the duty ratio of the first switch tube and second switch is less than or equal to 0.5, or is greater than 0.5.
Optionally, the three level Boost circuits further include: third diode；
The anode of the third diode connects the output negative pole of the Boost circuit, the cathode of the third diode
Connect the cathode of the power supply.
Optionally, the capacity of the third capacitor and the capacity of the 4th capacitor are equal, and are greater than the appearance of second capacitor
Amount.
The utility model additionally provides a kind of inversion system, including a kind of above-mentioned three level Boosts circuit, further includes: light
Photovoltaic array and inverter；
For the photovoltaic array as power supply, the output end of the photovoltaic array connects the defeated of the three level Boosts circuit
Enter end；
The output end of the three level Boosts circuit connects the input terminal of the inverter；
The three level Boosts circuit, the voltage for exporting the photovoltaic array boost；
The inverter, for being that alternating current is supplied to electricity by the DC inverter of the three level Boosts circuit output
Net or load.
Compared with prior art, the utility model at least has the following advantages:
It includes: first switch tube, second switch, the first electricity that the utility model, which provides three level Boost circuits of one kind,
Sense, the second capacitor, third capacitor, the 4th capacitor, first diode, the second diode and third switching tube；The Boost circuit
Input terminal connect first capacitor；The first capacitor is connected in parallel on both ends of power；The first end of the first switch tube connects institute
The anode of power supply is stated, the second end of the first switch tube connects first node；The first end of the second switch connects institute
State first node, the cathode that the second end of the second switch passes through power supply described in first inductance connection；The third
The first end of capacitor connects the anode of the power supply, and the second end of the third capacitor connects second node；4th capacitor
First end connect the second node, the second end of the 4th capacitor connects the output negative pole of the Boost circuit；Described
The first end of two capacitors connects the first node, and the second end of second capacitor connects third node；One or two pole
The anode of pipe connects the third node, and the cathode of the first diode connects the second end of the second switch；It is described
The anode of second diode connects the output negative pole of the Boost circuit, and the cathode of second diode connects the third
Node；The first end of the third switching tube connects the first node, the second end connection of the third switching tube described the
Two nodes；When the Boost circuit works, the third switching tube is disconnected；When the Boost circuit does not work, the third
Switching tube closure.The circuit is the Boost circuit of anode altogether, by the voltage at the second capacitor-clamped second switch both ends, by
It connects in first switch tube and second switch, first switch tube and second switch bear busbar voltage after series connection, when second
When switching tube receiving voltage is clamped, the voltage that the first switch tube of series connection with it is born also is clamped, and therefore, can make first
Switching tube and second switch realization are pressed.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of traditional Boost circuit structural schematic diagram provided by the present application；
Fig. 2 is three level Boosts electrical block diagram provided by the embodiments of the present application；
Fig. 3 is the three level Boost electrical block diagrams provided by the embodiments of the present application including IGBT；
Fig. 4 be it is provided by the embodiments of the present application include the 4th diode three level Boost electrical block diagrams；
Fig. 4 a is the first working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 4 b is the second working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 4 c is third working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 4 d is the 4th working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 4 e is the 5th working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 4 f is the 6th working condition current path schematic diagram provided by the embodiments of the present application；
Fig. 5 is the three level Boost electrical block diagrams that the embodiment of the present application three provides；
Fig. 6 is inversion system structural schematic diagram provided by the embodiments of the present application.
Specific embodiment
Referring to Fig. 1, which is a kind of traditional Boost circuit structural schematic diagram provided by the present application.
The Boost circuit of Fig. 1 includes inductance L, metal-oxide-semiconductor M, diode D and capacitor C.
Boost circuit working principle are as follows: firstly, metal-oxide-semiconductor M is made to be in on-state, power supply V charges to inductance L, and power supply V
It charges and powers to the load to capacitor C；Then, metal-oxide-semiconductor M is disconnected, due to the electric current retention performance of inductance, power supply V and inductance
L charges and powers to the load to capacitor C simultaneously, so as to improve capacitor both end voltage；Finally, repeating the mistake of metal-oxide-semiconductor M on-off
Journey, so that the voltage at capacitor both ends is improved to the input voltage of inverter.
However, the voltage stress of single switching transistor in Boost circuit has when the input voltage of Boost circuit is higher
Limit, therefore, can use two switching tubes in above-mentioned Boost circuit.But in Boost circuit work, how to realize two
Switching tube is pressed, and is the technical problem that Boost circuit faces.
In order to solve the problems, such as that above-mentioned Boost circuit exists, the embodiment of the present application provides a kind of three level Boost circuits
It include: first switch tube, second switch, the first inductance, the second capacitor, third capacitor, the 4th capacitor, first diode,
Two diodes and third switching tube；The input terminal of the Boost circuit connects first capacitor；The first capacitor is connected in parallel on electricity
Source both ends；The first end of the first switch tube connects the anode of the power supply, the second end connection of the first switch tube the
One node；The first end of the second switch connects the first node, and the second end of the second switch passes through described
The cathode of power supply described in first inductance connection；The first end of the third capacitor connects the anode of the power supply, the third electricity
The second end of appearance connects second node；The first end of 4th capacitor connects the second node, and the of the 4th capacitor
Two ends connect the output negative pole of the Boost circuit；The first end of second capacitor connects the first node, second electricity
The second end of appearance connects third node；The anode of the first diode connects the third node, the first diode
Cathode connects the second end of the second switch；The output that the anode of second diode connects the Boost circuit is negative
The cathode of pole, second diode connects the third node；The first end of the third switching tube connects the first segment
The second end of point, the third switching tube connects the second node；When the Boost circuit works, the third switching tube
It disconnects；When the Boost circuit does not work, the third switching tube closure.
Three level Boosts circuit provided by the embodiments of the present application include: first switch tube, second switch, the first inductance,
Second capacitor, third capacitor, the 4th capacitor, first diode, the second diode and third switching tube.The circuit is positive altogether
Boost circuit, by the voltage at the second capacitor-clamped second switch both ends, due to first switch tube and second switch string
Connection, first switch tube and second switch bear busbar voltage after series connection, when second switch, which bears voltage, to be clamped, with it
The voltage that concatenated first switch tube is born also is clamped, and therefore, first switch tube and second switch can be made to realize and pressed.
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this reality
With novel protected range.
Embodiment one:
Referring to fig. 2, which is three level Boosts electrical block diagram provided by the embodiments of the present application.
Three level Boosts circuit provided by the embodiments of the present application includes: first switch tube Q1, second switch Q2, first
Inductance L, the second capacitor C2, third capacitor C3, the 4th capacitor C4, first diode D1, the second diode D2 and third switching tube
Q3；
The input terminal of the Boost circuit connects first capacitor C1；The first capacitor C1 is connected in parallel on both ends of power；
The first end of the first switch tube Q1 connects the anode of the power supply, the second end of the first switch tube Q1
Connect first node；The first end connection first node of the second switch Q2, the second of the second switch Q2
End connects the cathode of the power supply by the first inductance L；
The first end of the third capacitor C3 connects the anode of the power supply, the second end connection of the third capacitor C3 the
Two nodes；The first end of the 4th capacitor C4 connects the second node, and the second end connection of the 4th capacitor C4 should
The output negative pole of Boost circuit；
The first end of the second capacitor C2 connects the first node, and the second end of the second capacitor C2 connects third
Node；
The anode of the first diode D1 connects the third node, described in the cathode connection of the first diode D1
The second end of second switch Q2；The anode of the second diode D2 connects the output negative pole of the Boost circuit, and described
The cathode of two diode D2 connects the third node；
The first end of the third switching tube Q3 connects the first node, and the second end of the third switching tube Q3 connects
Connect the second node；
When the Boost circuit works, the third switching tube Q3 is disconnected；When the Boost circuit does not work, described
Three switching tube Q3 closure.
It should be noted that Boost circuit is in off position, and leads to Boost when third switching tube Q3 conducting
The case where off position includes that power supply is in high pressure mode or load in standby mode etc.；When third switching tube Q3 is disconnected
When, Boost circuit is in running order.
Third switching tube Q3 plays the role of voltage clamping in three level Boost circuits.Clamper principle are as follows: when the second electricity
When the voltage of appearance C2 is lower than the voltage at second node, then third switching tube Q3 is connected, and Boost circuit is made to be in the shape that do not work
State, and charge for the second capacitor C2, when the voltage of first node and the identical voltage of second node, then disconnect third switch
Pipe Q3 keeps Boost circuit in running order.Moreover, because the second capacitor C2 is in parallel with second switch Q2, and third capacitor
C3 is in parallel with first switch tube Q1, when the voltage of first node is equal with the voltage of second node, then realizes first switch tube
Q1 is pressed with second switch Q2, respectively clamps first switch tube Q1 and second switch Q2 both end voltage stress to reach
Position is to positive and negative half busbar voltage.
The third switching tube Q3 is controlled tr tube, for example, the controlled tr tube are as follows: IGBT, MOSFET, JFET
Or relay.
Referring to Fig. 3, which is the three level Boost electrical block diagrams provided by the embodiments of the present application including IGBT.
The third switching tube Q3 of the three level Boost circuits of Fig. 3 uses IGBT controlled tr tube S, when IGBT controllable switch
When pipe S is closed, three level Boost circuits do not work, and the circuit is the second capacitor C2 charging, improves the electricity of the second capacitor C2
Pressure；When IGBT controlled tr tube S is disconnected, the work of three level Boost circuits.
The third switching tube Q3 is the 4th diode；
The anode of 4th diode connects the second node, the cathode connection described first of the 4th diode
Node.
Referring to fig. 4, three level Boost circuit structures of the figure to be provided by the embodiments of the present application include the 4th diode
Schematic diagram.
The third switching tube Q3 of the three level Boost circuits of Fig. 4 use the 4th diode D4, when the 4th diode D4 just
When pole tension is higher than cathode voltage, then the 4th diode D4 is connected, and three level Boost circuits do not work at this time, and the circuit
For the second capacitor C2 charging, the voltage of the second capacitor C2 is improved；When the 4th diode D4 cathode voltage is not higher than cathode voltage
When, then the 4th diode D4 is disconnected, the work of three level Boost circuits.
Three level Boosts circuit provided by the embodiments of the present application includes third switching tube Q3, which passes through control third
The conducting and disconnection of switching tube Q3, which is realized, is clamped to positive and negative half for first switch tube Q1 and second switch Q2 both end voltage stress
Busbar voltage so that first switch tube Q1 and second switch Q2 can select the switching tube of low-voltage, reduce cost and
Reduce loss, improves generated energy.
The working condition of three level Boosts circuit provided by the embodiments of the present application includes 4 kinds of working conditions, wherein first
Kind working condition is that first switch tube Q1 and second switch Q2 is both turned on；Second of working condition is first switch tube Q1 conducting
And second switch Q2 is disconnected；The third working condition is that first switch tube Q1 is disconnected and second switch Q2 conducting；4th kind
Working condition is that first switch tube Q1 and second switch Q2 is disconnected.
For the ease of those skilled in the art to three level Boosts circuit different working condition provided by the embodiments of the present application
Understanding, the first working condition will successively be discussed in detail to the 4th with the three level Boost circuits for including the 4th diode below
Working condition.
The first working condition: first switch tube Q1 is connected and second switch Q2 is connected.
A referring to fig. 4, the figure are the first working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 conducting, first switch tube Q1 is equivalent to conducting wire, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit conducting；When second switch Q2 is connected
When, second switch Q2 is equivalent to conducting wire, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit conducting between first inductance L of two ends connection.
Thus, when first switch tube Q1 and second switch Q2 is both turned on, current path in Boost circuit are as follows: PV+-
Q1-Q2-L-PV-。
According to the flow direction of electric current in Boost circuit it is found that electric current flows through the first inductance L.The electricity of inducting of first inductance L
Kinetic potential increases with the increase of electric current flushing time.When direct current flows through the first inductance L, induct in the first inductance L electronic
The size of gesture is determined by the size of electric current, electric current flushing time and inductance parameters.Wherein, electric current is bigger, then the first inductance L
Induced electromotive force is bigger；Electric current flushing time is longer, then the induced electromotive force of the first inductance L is bigger；Inductance parameters are bigger, then and
The induced electromotive force of one inductance L is bigger.
Second of working condition: first switch tube Q1 is connected and second switch Q2 is disconnected.
B referring to fig. 4, the figure are the second working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 conducting, first switch tube Q1 is equivalent to conducting wire, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit conducting；When second switch Q2 is disconnected
When, second switch Q2 is equivalent to open circuit, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit between first inductance L of two ends connection disconnects.
Thus, when first switch tube Q1 is connected and second switch Q2 is disconnected, current path in Boost circuit are as follows: PV
+-Q1-C2-D1-L-PV-。
According to the flow direction of electric current in Boost circuit it is found that electric current flows through the second capacitor C2, then according to the second capacitor C2
On the size of voltage carry out different operations, can discharge, charge or attonity；Electric current flows through the first inductance L, then basis
The size of induced electromotive force on first inductance L carries out different operations, can discharge, and can also accumulate induced electromotive force, also
It can be with attonity.
The third working condition: first switch tube Q1 is disconnected and second switch Q2 is connected.
C referring to fig. 4, the figure are third working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 is disconnected, first switch tube Q1 is equivalent to open circuit, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit disconnect；When second switch Q2 is connected
When, second switch Q2 is equivalent to conducting wire, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit conducting between first inductance L of two ends connection.
Thus, when first switch tube Q1 is disconnected and second switch Q2 is connected, current path in Boost circuit are as follows: PV
+-C3-C4-D2-C2-Q2-L-PV-。
It is according to the flow direction of electric current in Boost circuit it is found that electric current flows through third capacitor C3 and the 4th capacitor C4, then electric
Source is that third capacitor C3 and the 4th capacitor C4 charges, and improves voltage；Electric current flows through the second capacitor C2, then according on the second capacitor C2
The size of voltage carry out different operations, can discharge, charge or attonity；Electric current flows through the first inductance L, then according to
The size of induced electromotive force on one inductance L carries out different operations, can discharge, and can also accumulate induced electromotive force, may be used also
With attonity.
4th kind of working condition: first switch tube Q1 is disconnected and second switch Q2 is disconnected.
D referring to fig. 4, the figure are the 4th working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 is disconnected, first switch tube Q1 is equivalent to open circuit, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit disconnect；When second switch Q2 is disconnected
When, second switch Q2 is equivalent to open circuit, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit between first inductance L of two ends connection disconnects.
Thus, when first switch tube Q1 and second switch Q2 is disconnected, current path in Boost circuit are as follows: PV+-
C3-C4-D2-D1-L-PV-。
It is according to the flow direction of electric current in Boost circuit it is found that electric current flows through third capacitor C3 and the 4th capacitor C4, then electric
Source is that third capacitor C3 and the 4th capacitor C4 charges, and improves voltage；Electric current flows through the first inductance L, then according on the first inductance L
The size of induced electromotive force carries out different operations, can discharge, and can also accumulate induced electromotive force, can be with attonity.
The operating condition of four kinds of working conditions of three level Boost circuits of above-mentioned introduction are as follows: when the Boost works
When, the sum of voltage and the voltage of the 4th capacitor C4 of third capacitor C3 are not higher than the voltage of first capacitor C1, thus, third switch
Pipe Q3 is disconnected.However, the circuit further includes other operating conditions, and under different operating conditions, which further includes difference
Working condition.
For example, when Boost work, if the sum of voltage of the voltage of third capacitor C3 and the 4th capacitor C4 is higher than the
Voltage of the voltage of the voltage of one capacitor C1 and the second capacitor C2 less than the 4th capacitor C4, then be first closed the third switching tube
Q3 disconnects third switching tube Q3 when the voltage of the second capacitor C2 rises to the voltage of the 4th capacitor C4.
Based on above-mentioned operating condition, three level Boost circuits further include 2 kinds of working conditions, wherein the 5th kind of working condition
For when the voltage and the second capacitor C2 of the sum of voltage of the voltage of third capacitor C3 and the 4th capacitor C4 higher than first capacitor C1
When voltage of the voltage less than the 4th capacitor C4, first switch tube Q1 is disconnected, second switch Q2 conducting and third switching tube Q3 are led
It is logical；6th kind of working condition is when the sum of the voltage of third capacitor C3 and the voltage of the 4th capacitor C4 are higher than first capacitor C1's
When voltage of the voltage of voltage and the second capacitor C2 less than the 4th capacitor C4, first switch tube Q1 is disconnected, second switch Q2 is disconnected
It opens and is connected with third switching tube Q3.
For the ease of those skilled in the art to three level Boosts circuit different working condition provided by the embodiments of the present application
Understanding, continue with include three level Boost circuits of the 4th diode be successively discussed in detail the 5th working condition and
6th working condition.
5th kind of working condition: when the sum of the voltage of third capacitor C3 and the voltage of the 4th capacitor C4 are higher than first capacitor C1
Voltage and when voltage of the voltage less than the 4th capacitor C4 of the second capacitor C2, first switch tube Q1 disconnects, second switch Q2
Conducting and third switching tube Q3 conducting.
E referring to fig. 4, the figure are the 5th working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 is disconnected, first switch tube Q1 is equivalent to open circuit, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit disconnect；When second switch Q2 is connected
When, second switch Q2 is equivalent to conducting wire, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit conducting between first inductance L of two ends connection: when third switching tube Q3 conducting, third switching tube Q3, which is equivalent to, to be led
Line, then the second node that is connected with the second end of third switching tube Q3 of first node of the first end connection of third switching tube Q3 it
Between circuit conducting.
Thus, when the voltage of third capacitor C3 and the voltage of the sum of voltage higher than first capacitor C1 of the 4th capacitor C4 and
When voltage of the voltage of the second capacitor C2 less than the 4th capacitor C4, and first switch tube Q1 is disconnected, second switch Q2 conducting and
Third switching tube Q3 is connected, current path in Boost circuit are as follows: PV+-C3-D4-Q2-L-PV-.
6th kind of working condition: when the sum of the voltage of third capacitor C3 and the voltage of the 4th capacitor C4 are higher than first capacitor C1
Voltage and when voltage of the voltage less than the 4th capacitor C4 of the second capacitor C2, first switch tube Q1 disconnects, second switch Q2
It disconnects and third switching tube Q3 is connected.
F referring to fig. 4, the figure are the 6th working condition current path schematic diagram provided by the embodiments of the present application.
When first switch tube Q1 is disconnected, first switch tube Q1 is equivalent to open circuit, then first switch tube Q1 first end connects
Positive pole and first switch tube Q1 second end connection first node between circuit disconnect；When second switch Q2 is disconnected
When, second switch Q2 is equivalent to open circuit, then the first node and second switch Q2 the of second switch Q2 first end connection
Circuit between first inductance L of two ends connection disconnects: when third switching tube Q3 conducting, third switching tube Q3, which is equivalent to, to be led
Line, then the second node that is connected with the second end of third switching tube Q3 of first node of the first end connection of third switching tube Q3 it
Between circuit conducting.
Thus, when the voltage of third capacitor C3 and the voltage of the sum of voltage higher than first capacitor C1 of the 4th capacitor C4 and
When voltage of the voltage of the second capacitor C2 less than the 4th capacitor C4, and first switch tube Q1 is disconnected, second switch Q2 is disconnected and
Third switching tube Q3 is connected, current path in Boost circuit are as follows: PV+-C3-D4-C2-D1-L-PV-.
By the introduction of six kinds of working conditions of above-mentioned three level Boosts circuit it is found that the first working condition is to the 6th kind of work
Making state can charge to the first inductance L；And the third working condition and the 4th kind of working condition can use
One inductance L and/or power supply are third capacitor C3 charging, or the 4th capacitor C4 charging, thus improve third capacitor C3 and
The voltage of 4th capacitor C4.Three level Boosts circuit provided by the embodiments of the present application includes: first switch tube Q1, second switch
Pipe Q2, the first inductance L, the second capacitor C2, third capacitor C3, the 4th capacitor C4, first diode D1, the second diode D2 and
Third switching tube Q3.The circuit is realized by the conducting and disconnection of control third switching tube Q3 and opens first switch tube Q1 with second
It closes pipe Q2 both end voltage stress and is clamped to positive and negative half busbar voltage, realize through third switching tube Q3, work in Boost circuit
When first switch tube Q1 and second switch Q2 press.
It should be noted that the capacity of the third capacitor and the capacity of the 4th capacitor are equal, and it is greater than second electricity
The capacity of appearance.
Three level Boosts circuit provided by the embodiments of the present application include: first switch tube, second switch, the first inductance,
Second capacitor, third capacitor, the 4th capacitor, first diode, the second diode and third switching tube.The circuit is positive altogether
Boost circuit, by the voltage at the second capacitor-clamped second switch both ends, due to first switch tube and second switch string
Connection, first switch tube and second switch bear busbar voltage after series connection, when second switch, which bears voltage, to be clamped, with it
The voltage that concatenated first switch tube is born also is clamped, and therefore, first switch tube and second switch can be made to realize and pressed.
Based on the three level Boost circuit of one kind that above embodiments provide, which has a variety of working conditions.It is real below
It applies example and provides a kind of three level Boost circuits, first switch tube and second switch alternate conduction when which staggeredly works.
Embodiment two:
Referring to fig. 2, which is three level Boosts electrical block diagram provided by the embodiments of the present application.
Three level Boosts circuit structure provided by the embodiments of the present application is identical as the circuit structure that embodiment one provides.But
It is that the three level Boost circuits of the embodiment of the present application have the special feature that when working are as follows:
The period of first switch tube Q1 driving signal corresponding with second switch Q2 is identical.
The driving signal can control the conducting and disconnection of first switch tube Q1 and second switch Q2.
The on state of the first switch tube Q1 and second switch Q2 is interlaced.
When the on state of three level Boost circuit control first switch tube Q1 and second switch Q2 is interlaced,
The circuit will alternately be in the second working condition and third working condition.
Technical solution provided by the present application is more fully understood in order to facilitate description and those skilled in the art, it below will be with
It is illustrated for the working condition of Boost circuit in first driving signal period.
Assuming that the driving signal period of first switch tube Q1 and second switch Q2 is 10 seconds, in each period, first
Switching tube Q1 is first connected 5 seconds, is then turned off 5 seconds；And second switch Q2 is then first disconnected 5 seconds, is then connected 5 seconds.
Working condition of the Boost circuit in a cycle are as follows: first 5 seconds, first switch tube Q1 was connected and second switch
Pipe Q2 is disconnected, then Boost circuit is in the second working condition, current path are as follows: PV+-Q1-C2-D1-L-PV-.In this 5 seconds
Power supply is the first inductance L charging, and the charging time is 5 seconds；5 seconds afterwards, first switch tube Q1 was disconnected and first switch tube Q1 is led
Logical, then Boost circuit is in third working condition, current path are as follows: PV+-C3-C4-D2-C2-Q2-L-PV-.In this 5 seconds,
Power supply and the first inductance L are that third capacitor C3 and the 4th capacitor C4 charges, and improve voltage.
The movement that a cycle will be repeated within each period after a cycle, steps up the to realize
The voltage of three capacitor C3 and the 4th capacitor C4.
Three level Boosts circuit provided by the embodiments of the present application passes through Interleaved control first switch tube Q1 and second switch
The conducting and disconnection of Q2 can make the charge and discharge electric frequency of the first inductance L, third capacitor C3 and the 4th capacitor C4 be higher than switch frequency
Rate, to improve boosting efficiency and reduce circuit cost.
Since the driving signal of first switch tube Q1 and second switch Q2 are periodic signal, and the duty ratio of periodic signal
It is an important parameter.
The duty ratio refers to that in a pulse cycle, conduction time is relative to ratio shared by total time.For example, arteries and veins
The period for rushing signal is 10 seconds, and conduction time is 2 seconds in each period, then the duty ratio of the pulse signal is 1/5.
The first switch tube Q1 of three level Boosts circuit provided by the embodiments of the present application and accounting for for second switch Q2
Sky is than identical.
The duty ratio of the first switch tube Q1 and second switch Q2 is less than or equal to 0.5, or is greater than 0.5.
Technical solution provided by the present application is more fully understood in order to facilitate description and those skilled in the art, will be divided below
It is not greater than 0.5 with duty ratio less than or equal to 0.5 with duty ratio and is illustrated.
Assuming that the driving signal period of first switch tube Q1 and second switch Q2 is T,
When the duty ratio of periodic signal is 1/3, in one cycle, the work of first switch tube Q1 and second switch Q2
It is as follows to make state:
Referring to table 1, which is the circuit working state table of duty ratio≤0.5 provided by the embodiments of the present application.
The circuit working state table of 1 duty ratio≤0.5 of table
| Q1 | 0 | 0 | 1 |
| Q2 | 1 | 0 | 0 |
In table 1, parameter 0 indicates that first switch tube Q1 or second switch Q2 is in an off state；Parameter 1 indicates that first opens
It is in the conductive state to close pipe Q1 or second switch Q2.From the data in the table, first switch tube Q1 and second switch Q2 exist
The time span be connected in cycle T is 1/3T.
When duty ratio is 2/3, in one cycle, the working condition of first switch tube Q1 and second switch Q2 are such as
Under:
Referring to table 2, which is the circuit working state table of duty ratio > 0.5 provided by the embodiments of the present application.
The circuit working state table of 1 duty ratio > 0.5 of table
| Q1 | 0 | 1 | 1 |
| Q2 | 1 | 1 | 0 |
In table 1, parameter 0 indicates that first switch tube Q1 or second switch Q2 is in an off state；Parameter 1 indicates that first opens
It is in the conductive state to close pipe Q1 or second switch Q2.From the data in the table, first switch tube Q1 and second switch Q2 exist
The time span be connected in cycle T is 2/3T.
Three level Boosts circuit provided by the embodiments of the present application passes through control first switch tube Q1's and second switch Q2
Duty ratio, and then the voltage at the second both ends capacitor C2 is controlled, the sum of minus half bus C4 both end voltage and Δ U are made it equal to, Δ U can
Voltage value to be very little does not limit, such as 5V, 7V etc., and main purpose is made when Boost is in third working condition
Current path are as follows: PV+-C3-C4-D2-C2-Q2-L-PV-, rather than: PV+-C3-D4-Q2-L-PV-.
Three level Boosts circuit provided by the present application at work, is handed over using first switch tube Q1 and second switch Q2
For the mode of conducting, the circuit is made alternately to be in the second working condition and third working condition.When the circuit works, to make
The frequency for obtaining the first inductance L is higher than the frequency of switching tube, and effective volume, loss and the cost for reducing the first inductance L reduces
The loss and cost of the circuit.In addition, duty ratio of the circuit by control first switch tube Q1 and second switch Q2, into
And the voltage at the second both ends capacitor C2 is controlled, and then ensure that the working condition of the circuit is normal.
Based on the three level Boost circuit of one kind that above embodiments provide, which is also applied for Boost circuit to defeated
Enter the application scenarios that voltage carries out low-loss transmission, following example provides a kind of three level Boost circuits, which can be right
Input voltage carries out low-loss transmission.
Embodiment three:
Referring to Fig. 5, which is the three level Boost electrical block diagrams that the embodiment of the present application three provides.
Three level Boosts circuit provided by the embodiments of the present application is electric in addition to three level Boosts for including the offer of embodiment one
Outside the structure on road, further includes: third diode D3；
The anode of the third diode D3 connects the output negative pole of the Boost circuit, the third diode D3's
Cathode connects the cathode of the power supply.
The working condition of three level Boosts circuit provided by the embodiments of the present application, the four kinds of works provided in addition to embodiment one
Make outside state, further includes the 5th kind of working condition.
The electric circuit characteristic of 5th kind of working condition are as follows: first switch tube Q1 and second switch Q2 are disconnected, and the circuit
Current path are as follows: PV+-C3-C4-D3-PV-.
The application scenarios of 5th kind of working condition are as follows: the input voltage of Boost circuit is higher, meets the input electricity of inverter
The requirement of pressure, thus, the voltage of power supply does not need then to boost, and only need to input inversion by the third diode D3 of Boost circuit
Device.
Three level Boosts circuit provided by the embodiments of the present application further includes third diode D3, defeated when Boost circuit
When entering the height for the input voltage that voltage reaches inverter, when which is in five working conditions, the electric current of power supply output will
The third diode D3 for flowing through the circuit reaches inverter, effectively reduces loss, inverter efficiency is improved, to improve inversion
Device generated energy.
Based on the three level Boost circuit of one kind that above embodiments provide, the embodiment of the present application also provides a kind of contravariant system
System, is described in detail with reference to the accompanying drawing.
Example IV:
Referring to Fig. 6, which is inversion system structural schematic diagram provided by the embodiments of the present application.
Inversion system provided by the embodiments of the present application includes a kind of three level Boosts circuit provided by the above embodiment
602, further includes: photovoltaic array 601 and inverter 603；
The photovoltaic array 601 is used as power supply, and the output end of the photovoltaic array 601 connects the three level Boosts electricity
The input terminal on road 602；
The output end of the three level Boosts circuit 602 connects the input terminal of the inverter 603；
The three level Boosts circuit 602, the voltage for exporting the photovoltaic array 601 boost；
The inverter 603, the DC inverter for exporting the three level Boosts circuit 602 mention for alternating current
Supply power grid or load 604.
It should be noted that the exportable direct current of photovoltaic array 601, and the voltage of the direct current is lower；Inverter 603
Input voltage is higher.
Inversion system provided by the embodiments of the present application includes: photovoltaic array 601, three level Boost circuits 602 and inversion
Device 603.Photovoltaic array 601 is used as power supply, first converts direct current energy for solar energy, is then input to three level Boosts electricity
In road 602, the voltage that three level Boost circuits 602 are inputted the direct current of end input boosts, then will be after boosting
DC supply input is to inverter 603, and the DC inverter that the three level Boosts circuit 602 exports then is by inverter 603
Alternating current is supplied to power grid or load 604.
Inversion system provided by the embodiments of the present application includes photovoltaic array 601, three level Boost circuits 602 and inverter
603.The photovoltaic array 601 is used as power supply, and the output end of the photovoltaic array 601 connects the three level Boosts circuit 602
Input terminal；The output end of the three level Boosts circuit 602 connects the input terminal of the inverter 603；Three level
Boost circuit 602, the voltage for exporting the photovoltaic array 601 boost；The inverter 603, being used for will be described
The DC inverter of three level Boost circuits 602 output is that alternating current is supplied to power grid or load 604.The inversion system uses
Three level Boost circuits 602 low-voltage DC can be boosted so that high efficiency is low-loss, it is defeated to improve inverter 603
The working range and MPPT for entering voltage, improve the generated energy of inverter 603.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation.Although the utility model has been disclosed with preferred embodiment as above, it is not intended to limit the utility model.It is any ripe
Those skilled in the art is known, in the case where not departing from technical solutions of the utility model ambit, all using the side of the disclosure above
Method and technology contents make many possible changes and modifications to technical solutions of the utility model, or be revised as equivalent variations etc.
Imitate embodiment.Therefore, all contents without departing from technical solutions of the utility model, according to the technical essence of the utility model to
Any simple modifications, equivalents, and modifications that upper embodiment is done still fall within the model of technical solutions of the utility model protection
In enclosing.
Claims (12)
1. a kind of three level Boost circuits characterized by comprising first switch tube, second switch, the first inductance, second
Capacitor, third capacitor, the 4th capacitor, first diode, the second diode and third switching tube；
The input terminal of the Boost circuit connects first capacitor；The first capacitor is connected in parallel on both ends of power；
The first end of the first switch tube connects the anode of the power supply, and the second end of the first switch tube connects first segment
Point；The first end of the second switch connects the first node, and the second end of the second switch passes through described first
The cathode of power supply described in inductance connection；
The first end of the third capacitor connects the anode of the power supply, and the second end of the third capacitor connects second node；
The first end of 4th capacitor connects the second node, and the second end of the 4th capacitor connects the defeated of the Boost circuit
Cathode out；
The first end of second capacitor connects the first node, and the second end of second capacitor connects third node；
The anode of the first diode connects the third node, and the cathode of the first diode connects the second switch
The second end of pipe；The anode of second diode connects the output negative pole of the Boost circuit, and second diode is born
Pole connects the third node；
The first end of the third switching tube connects the first node, the second end connection described second of the third switching tube
Node；
When the Boost circuit works, the third switching tube is disconnected；When the Boost circuit does not work, the third switch
Pipe closure.
2. three level Boosts circuit according to claim 1, which is characterized in that described when the Boost circuit works
Third switching tube disconnects, and specifically includes:
When Boost work, if the sum of voltage of the voltage of third capacitor and the 4th capacitor is higher than the voltage of first capacitor
And second capacitor voltage less than the voltage of the 4th capacitor, then the third switching tube is first closed, when the voltage liter of the second capacitor
To the 4th capacitor voltage when disconnect third switching tube.
3. three level Boosts circuit according to claim 1, which is characterized in that the third switching tube is controllable switch
Pipe.
4. three level Boosts circuit according to claim 3, which is characterized in that the controlled tr tube are as follows: IGBT,
MOSFET, JFET or relay.
5. three level Boosts circuit according to claim 1, which is characterized in that the third switching tube is the four or two pole
Pipe；
The anode of 4th diode connects the second node, and the cathode of the 4th diode connects the first segment
Point.
6. three level Boosts circuit according to claim 1-5, which is characterized in that the first switch tube and
The period of the corresponding driving signal of second switch is identical.
7. three level Boosts circuit according to claim 1-5, which is characterized in that the first switch tube and
The on state of second switch is interlaced.
8. three level Boosts circuit according to claim 1-5, which is characterized in that the first switch tube and
The duty ratio of second switch is identical.
9. three level Boosts circuit according to claim 8, which is characterized in that the first switch tube and second switch
The duty ratio of pipe is less than or equal to 0.5, or is greater than 0.5.
10. three level Boosts circuit according to claim 1-5, which is characterized in that further include: the three or two pole
Pipe；
The anode of the third diode connects the output negative pole of the Boost circuit, the cathode connection of the third diode
The cathode of the power supply.
11. three level Boosts circuit according to claim 1-5, which is characterized in that the appearance of the third capacitor
Measure capacity equal with the capacity of the 4th capacitor, and being greater than second capacitor.
12. a kind of inversion system, which is characterized in that including the described in any item three level Boosts circuits of claim 1-11, also
It include: photovoltaic array and inverter；
For the photovoltaic array as power supply, the output end of the photovoltaic array connects the input terminal of the three level Boosts circuit；
The output end of the three level Boosts circuit connects the input terminal of the inverter；
The three level Boosts circuit, the voltage for exporting the photovoltaic array boost；
The inverter, for by the DC inverter of the three level Boosts circuit output be alternating current be supplied to power grid or
Load.
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| CN201821059908.XU CN208571927U (en) | 2018-07-04 | 2018-07-04 | Three level Boost circuits of one kind and inversion system |
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| CN201821059908.XU CN208571927U (en) | 2018-07-04 | 2018-07-04 | Three level Boost circuits of one kind and inversion system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994975A (en) * | 2019-12-18 | 2020-04-10 | 阳光电源股份有限公司 | Capacitor clamp type direct current conversion circuit |
| CN112564483A (en) * | 2021-02-23 | 2021-03-26 | 浙江日风电气股份有限公司 | Flying capacitor three-level Boost circuit and control method thereof |
| WO2021115032A1 (en) * | 2019-12-13 | 2021-06-17 | 科华恒盛股份有限公司 | Multi-level boost circuit, and apparatus and system thereof |
| CN113644631A (en) * | 2021-09-17 | 2021-11-12 | 锦浪科技股份有限公司 | Processing method for half bus short circuit |
| WO2022016891A1 (en) * | 2020-07-22 | 2022-01-27 | 华为数字能源技术有限公司 | Three-level boost converter and control method |
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2018
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021115032A1 (en) * | 2019-12-13 | 2021-06-17 | 科华恒盛股份有限公司 | Multi-level boost circuit, and apparatus and system thereof |
| CN110994975A (en) * | 2019-12-18 | 2020-04-10 | 阳光电源股份有限公司 | Capacitor clamp type direct current conversion circuit |
| CN110994975B (en) * | 2019-12-18 | 2020-11-10 | 阳光电源股份有限公司 | Capacitor clamp type direct current conversion circuit |
| WO2022016891A1 (en) * | 2020-07-22 | 2022-01-27 | 华为数字能源技术有限公司 | Three-level boost converter and control method |
| CN112564483A (en) * | 2021-02-23 | 2021-03-26 | 浙江日风电气股份有限公司 | Flying capacitor three-level Boost circuit and control method thereof |
| CN113644631A (en) * | 2021-09-17 | 2021-11-12 | 锦浪科技股份有限公司 | Processing method for half bus short circuit |
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