CN109742947A - A kind of tri-lever boosting circuit and its control method - Google Patents
A kind of tri-lever boosting circuit and its control method Download PDFInfo
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- CN109742947A CN109742947A CN201910090403.2A CN201910090403A CN109742947A CN 109742947 A CN109742947 A CN 109742947A CN 201910090403 A CN201910090403 A CN 201910090403A CN 109742947 A CN109742947 A CN 109742947A
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Abstract
The present invention discloses a kind of tri-lever boosting circuit and its control method, which includes: DC power supply DC, boost inductance L1, power switch tube Q1, power switch tube Q2, output bus filter capacitor C1, output bus filter capacitor C2, the junction capacity C3 of power switch tube Q1, the junction capacity C4 of power switch tube Q2, power diode D1, power diode D2, power diode D3, sustained diode 4 and capacitor C5.The present invention is a kind of new tri-lever boosting circuit topology, advantage is as follows: one, power switch tube Q1 and power switch tube Q2 only needs to meet corresponding driver' s timing, and control is simple；Two, it inputs DC and output is total cathode, common mode interference problem is not present；Three, the driving of power switch tube Q1 and power switch tube Q2 do not need independent control, and only need an inductance L1, at low cost.
Description
Technical field
The present invention relates to field of power electronics more particularly to a kind of tri-lever boosting circuit and its control methods.
Background technique
In power electronics topology, Boost is a kind of most basic DC/DC topology, is applied to various electric power electricity
In sub- equipment.Photovoltaic DC-to-AC converter includes DC/DC and DC/AC two parts, and DC/DC can not only stablize the input electricity of the side DC/AC
Pressure, and solar panel can be allowed with maximum power output (MPPT, Maximum power point tracking), to improve
The generated energy of photovoltaic DC-to-AC converter, so DC/DC has vital effect for performance, the efficiency of photovoltaic DC-to-AC converter.Boost liter
Volt circuit topology is simple, control is simple, the side DC/DC of photovoltaic DC-to-AC converter is used extensively, for low-pressure system, two level
Boost can satisfy resistance to pressure request, still, for more high input voltage, since power tube general in the market is mostly low pressure
Device, and high tension apparatus price is several times of low-voltage device, two level Boosts have been difficult to meet resistance to pressure request.Present three electricity
Flat booster circuit includes: symmetrical Boost tri-lever boosting circuit, striding capacitance tri-lever boosting circuit.Wherein, symmetrical Boost
Tri-lever boosting circuit: the topology and driver' s timing of symmetrical BOOST booster circuit are as shown in Fig. 1 and Fig. 2, since bus exports
Do not ensure that between DC source DC there are diode D1 and diode D2, switching tube Q1 and Q2 at the same turn on and off,
And when capacitor C1 and capacitor C2 mid-point voltage have deviation, the driver' s timing of regulating switch pipe Q1 and switching tube Q2 are needed to stablize
The mid-point voltage of capacitor C1 and capacitor C2, cause output voltage over the ground between there are shapes between serious common-mode signal and the earth
At common mode interference, lead to very high leakage current, influence the normal work of system, symmetrical Boost tri-lever boosting voltage needs two
A inductance needs the independent driving circuit of two-way, these also both increase system cost.Striding capacitance tri-lever boosting circuit:
The topology and driver' s timing of striding capacitance tri-lever boosting circuit are as shown in Fig. 3 and Fig. 4, although three level of striding capacitance is not deposited
In common mode interference problem, still, three level of striding capacitance need to fly across capacitor C3 be pre-charged, pre-charge circuit design
It is more complicated, and in steady operation, the voltage on capacitor C3 is at every moment controlled, cumbersome, the capacitance ratio of capacitor C3 is controlled
Larger, cost is also relatively high, and three level of striding capacitance is difficult to be widely used in engineering so far.
Summary of the invention
It is an object of the invention to by a kind of tri-lever boosting circuit and its control method, to solve background above technology
The problem of part is mentioned.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of tri-lever boosting circuit comprising: DC power supply DC, boost inductance L1, power switch tube Q1, power switch
Pipe Q2, output bus filter capacitor C1, output bus filter capacitor C2, the junction capacity C3 of power switch tube Q1, power switch tube
Junction capacity C4, power diode D1, power diode D2, power diode D3, sustained diode 4 and the capacitor C5 of Q2；Its
In, one end of the anode connection boost inductance L1 of the DC power supply DC, the cathode of DC power supply DC is with power switch tube Q2's
Emitter, one end connection for exporting bus filter capacitor C2, the other end of boost inductance L1 and anode, the function of power diode D1
The collector of rate switching tube Q1 connects, one end of the cathode of power diode D1 and capacitor C5, power diode D2 anode,
The cathode of power diode D3 connects, the other end and the emitter of power switch tube Q1, the collection of power switch tube Q2 of capacitor C5
The anode connection of electrode, sustained diode 4, junction capacity C3 are attempted by between the collector and emitter of power switch tube Q1, tie
Capacitor C4 is attempted by between the collector and emitter of power switch tube Q2, anode and the sustained diode 4 of power diode D3
Cathode, export bus filter capacitor C1 one end, export bus filter capacitor C2 the other end connection, export bus filtered electrical
The other end for holding C1 is connect with the cathode of power diode D2.
Based on above-mentioned tri-lever boosting circuit, the invention also discloses a kind of tri-lever boosting circuit control method, the party
Method includes:
The driver' s timing of power switch tube Q1, power switch tube Q2 are as follows: in each period, original state power switch tube Q1
Gate drive voltage with power switch tube Q2 is low level；In the t1 period, the gate drive voltage of power switch tube Q1
Gate drive voltage for high level, power switch tube Q2 is low level；Later, power switch tube Q1 and power switch tube Q2
Gate drive voltage is high level；In the t2 period, the gate drive voltage of power switch tube Q1 is high level, power switch
The gate drive voltage of pipe Q2 is low level；Assuming that total busbar voltage is to remain unchanged, preceding x period of the booster circuit in work
Interior, the current potential of bus midpoint s increases always, it is assumed that when the current potential of bus midpoint s is increased to a, bus midpoint s current potential no longer occurs
Variation, is always a；The voltage at the both ends capacitor C5 is b, and the voltage at the output both ends bus filter capacitor C2 is a:
One, in the t1 period, power switch tube Q1 is open-minded, and power switch tube Q2 shutdown, capacitor C5 charge remains unchanged, no
Charging is not also discharged, and the voltage at the both ends capacitor C5 is b；
Two, power switch tube Q1 is open-minded, and power switch tube Q2 is open-minded, and capacitor C5 is electrically charged by power diode D3, fills
The electric quantity of electric charge is △ Qc5, and the voltage at the both ends capacitor C5 becomes a from b；
Three, in the t2 period, power switch tube Q1 is open-minded, and power switch tube Q2 shutdown, capacitor C5 passes through power switch tube
D2 is △ Qc5 to total bus discharge, discharge charge amount, and the voltage at the both ends capacitor C5 becomes b from a
Four, power switch tube Q1 is turned off, and power switch tube Q2 shutdown, capacitor C5 charge remains unchanged；
If in each period, being to the average value of the charging current of output bus filter capacitor C2 in t1 the and t2 period
Ic2 is then △ Qc2=Ic2* (t1+t2), Mei Gezhou to the charging charge amount of output bus filter capacitor C2 in each period
Capacitor C5 is △ Qc5 to the quantity of electric charge of total bus discharge in phase, because of the △ Qc2=△ Qc5 in whole cycle, output is female
Line midpoint s voltage remains unchanged.
The present invention provides a kind of new tri-lever boosting circuit topologies, have the advantages that one, because of power switch tube
Q1's and power switch tube Q2 only needs to meet corresponding driver' s timing, so control is simple；Two, because of input DC and defeated
It is total cathode out, so common mode interference problem is not present；Three, not because of the driving of power switch tube Q1 and power switch tube Q2
Independent control is needed, and only needs an inductance L1, so at low cost.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of symmetrical BOOST booster circuit；
Fig. 2 is the Topology Driven timing of symmetrical BOOST booster circuit；
Fig. 3 is the topological structure schematic diagram of striding capacitance tri-lever boosting circuit；
Fig. 4 is striding capacitance tri-lever boosting circuit topology driver' s timing；
Fig. 5 is tri-lever boosting circuit structure diagram provided in an embodiment of the present invention；
Fig. 6 is the driver' s timing of power switch tube Q1 and power switch tube Q2 provided in an embodiment of the present invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is makes to the more thorough of the disclosure understanding
Comprehensively.It should be noted that it can be directly to another when an element is considered as " connection " another element
Element may be simultaneously present centering elements.Unless otherwise defined, all technical and scientific terms used herein with
It is identical to belong to the normally understood meaning of those skilled in the art of the invention.Made in the description of the invention herein
Term, which is only for the purpose of describing specific embodiments, is not intended to limit the present invention.Term as used herein
" and/or " it include any and all combinations of one or more related listed items.
Shown in referring to figure 5., Fig. 5 is tri-lever boosting circuit structure diagram provided in an embodiment of the present invention.
Tri-lever boosting circuit specifically includes in the present embodiment: DC power supply DC, boost inductance L1, power switch tube Q1,
Junction capacity C3, the function of power switch tube Q2, output bus filter capacitor C1, output bus filter capacitor C2, power switch tube Q1
The junction capacity C4 of rate switching tube Q2, power diode D1, power diode D2, power diode D3, sustained diode 4 and
Capacitor C5；Wherein, one end of the anode connection boost inductance L1 of the DC power supply DC, cathode and the power of DC power supply DC are opened
One end connection closed the emitter of pipe Q2, export bus filter capacitor C2, the other end and power diode D1 of boost inductance L1
Anode, power switch tube Q1 collector connection, one end, the power diode D2 of the cathode of power diode D1 and capacitor C5
Anode, power diode D3 cathode connection, emitter, the power switch tube of the other end of capacitor C5 and power switch tube Q1
The anode connection of the collector, sustained diode 4 of Q2, junction capacity C3 are attempted by the collector and emitter of power switch tube Q1
Between, junction capacity C4 is attempted by between the collector and emitter of power switch tube Q2, the anode of power diode D3 and afterflow
The cathode of diode D4, the one end for exporting bus filter capacitor C1, the other end connection for exporting bus filter capacitor C2, output are female
The other end of line filter capacitor C1 is connect with the cathode of power diode D2.Wherein, the power diode D3 anode and afterflow
The node s of diode D4 cathode is bus midpoint.
The present embodiment also discloses a kind of control method of above-mentioned tri-lever boosting circuit, in the present embodiment three level liters
Volt circuit control method specifically includes:
As shown in fig. 6, the driver' s timing of power switch tube Q1, power switch tube Q2 are as follows: in each period, original state function
The gate drive voltage of rate switching tube Q1 and power switch tube Q2 are low level；In the t1 period, the door of power switch tube Q1
Pole driving voltage be high level, power switch tube Q2 gate drive voltage be low level；Later, power switch tube Q1 and power
The gate drive voltage of switching tube Q2 is high level；In the t2 period, the gate drive voltage of power switch tube Q1 is high electricity
Flat, power switch tube Q2 gate drive voltage is low level；Assuming that total busbar voltage is to remain unchanged, the booster circuit is in work
In the preceding x period made, the current potential of bus midpoint s is increased always, it is assumed that when the current potential of bus midpoint s is increased to a, bus midpoint s
Current potential is no longer changed, and is always a；The voltage at the both ends capacitor C5 is b, and the voltage at the output both ends bus filter capacitor C2 is a:
One, in the t1 period, power switch tube Q1 is open-minded, and power switch tube Q2 shutdown, capacitor C5 charge remains unchanged, no
Charging is not also discharged, and the voltage at the both ends capacitor C5 is b；
Two, power switch tube Q1 is open-minded, and power switch tube Q2 is open-minded, and capacitor C5 is electrically charged by power diode D3, fills
The electric quantity of electric charge is △ Qc5, and the voltage at the both ends capacitor C5 becomes a from b；
Three, in the t2 period, power switch tube Q1 is open-minded, and power switch tube Q2 shutdown, capacitor C5 passes through power switch tube
D2 is △ Qc5 to total bus discharge, discharge charge amount, and the voltage at the both ends capacitor C5 becomes b from a
Four, power switch tube Q1 is turned off, and power switch tube Q2 shutdown, capacitor C5 charge remains unchanged；
If in each period, being to the average value of the charging current of output bus filter capacitor C2 in t1 the and t2 period
Ic2 is then △ Qc2=Ic2* (t1+t2), Mei Gezhou to the charging charge amount of output bus filter capacitor C2 in each period
Capacitor C5 is △ Qc5 to the quantity of electric charge of total bus discharge in phase, because of the △ Qc2=△ Qc5 in whole cycle, output is female
Line midpoint s voltage remains unchanged.
Technical solution of the present invention provides a kind of new tri-lever boosting circuit topology, compared to symmetrical tri- electricity of Boost
The advantages that flat topology, striding capacitance three-level topology have control simple, are not present common mode interference, at low cost.Because power is opened
As long as the driver' s timing for closing pipe Q1 and power switch tube Q2 meets Fig. 6, so control is simple；Because inputting DC and output
It is total cathode, so common mode interference problem is not present；Because the driving of power switch tube Q1 and power switch tube Q2 do not need
Independent control, and an inductance L1 is only needed, so at low cost.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (2)
1. a kind of tri-lever boosting circuit characterized by comprising DC power supply DC, boost inductance L1, power switch tube Q1,
Junction capacity C3, the function of power switch tube Q2, output bus filter capacitor C1, output bus filter capacitor C2, power switch tube Q1
The junction capacity C4 of rate switching tube Q2, power diode D1, power diode D2, power diode D3, sustained diode 4 and
Capacitor C5；Wherein, one end of the anode connection boost inductance L1 of the DC power supply DC, cathode and the power of DC power supply DC are opened
One end connection closed the emitter of pipe Q2, export bus filter capacitor C2, the other end and power diode D1 of boost inductance L1
Anode, power switch tube Q1 collector connection, one end, the power diode D2 of the cathode of power diode D1 and capacitor C5
Anode, power diode D3 cathode connection, emitter, the power switch tube of the other end of capacitor C5 and power switch tube Q1
The anode connection of the collector, sustained diode 4 of Q2, junction capacity C3 are attempted by the collector and emitter of power switch tube Q1
Between, junction capacity C4 is attempted by between the collector and emitter of power switch tube Q2, the anode of power diode D3 and afterflow
The cathode of diode D4, the one end for exporting bus filter capacitor C1, the other end connection for exporting bus filter capacitor C2, output are female
The other end of line filter capacitor C1 is connect with the cathode of power diode D2.
2. a kind of control method of tri-lever boosting circuit, which is characterized in that this method comprises:
The driver' s timing of power switch tube Q1, power switch tube Q2 are as follows: in each period, original state power switch tube Q1 and function
The gate drive voltage of rate switching tube Q2 is low level；In the t1 period, the gate drive voltage of power switch tube Q1 is height
Level, power switch tube Q2 gate drive voltage be low level；Later, the gate pole of power switch tube Q1 and power switch tube Q2
Driving voltage is high level；In the t2 period, the gate drive voltage of power switch tube Q1 is high level, power switch tube Q2
Gate drive voltage be low level；Assuming that total busbar voltage is to remain unchanged, the booster circuit within the preceding x period of work,
The current potential of bus midpoint s increases always, it is assumed that when the current potential of bus midpoint s is increased to a, bus midpoint s current potential no longer becomes
Change, is always a；The voltage at the both ends capacitor C5 is b, and the voltage at the output both ends bus filter capacitor C2 is a:
One, in the t1 period, power switch tube Q1 is open-minded, and power switch tube Q2 shutdown, capacitor C5 charge is remained unchanged, do not charged
Also it does not discharge, the voltage at the both ends capacitor C5 is b；
Two, power switch tube Q1 is open-minded, and power switch tube Q2 is open-minded, and capacitor C5 is electrically charged by power diode D3, charging electricity
Lotus amount is △ Qc5, and the voltage at the both ends capacitor C5 becomes a from b；
Three, in the t2 period, power switch tube Q1 is open-minded, power switch tube Q2 shutdown, capacitor C5 by power switch tube D2 to
Total bus discharge, discharge charge amount are △ Qc5, and the voltage at the both ends capacitor C5 becomes b from a
Four, power switch tube Q1 is turned off, and power switch tube Q2 shutdown, capacitor C5 charge remains unchanged；
If being Ic2 to the average value of the charging current of output bus filter capacitor C2 in t1 the and t2 period, then in each period
It is △ Qc2=Ic2* (t1+t2), capacitor in each period to the charging charge amount of output bus filter capacitor C2 in each period
C5 is △ Qc5 to the quantity of electric charge of total bus discharge, because of the △ Qc2=△ Qc5 in whole cycle, exports bus midpoint s
Voltage remains unchanged.
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| CN201910090403.2A CN109742947A (en) | 2019-01-30 | 2019-01-30 | A kind of tri-lever boosting circuit and its control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098730A (en) * | 2019-06-11 | 2019-08-06 | 阳光电源股份有限公司 | A kind of three-level Boost converter, control method and photovoltaic system |
| CN110165888A (en) * | 2019-06-11 | 2019-08-23 | 阳光电源股份有限公司 | Three level Boost circuits, multiple-channel output parallel system |
| CN110572026A (en) * | 2019-09-26 | 2019-12-13 | 特变电工西安电气科技有限公司 | Clamp type three-level boost power conversion circuit |
| CN116247917A (en) * | 2023-05-10 | 2023-06-09 | 深圳市首航新能源股份有限公司 | Flying capacitor three-level Boost balance circuit and control method |
| US11870346B2 (en) | 2019-12-20 | 2024-01-09 | Huawei Digital Power Technologies Co., Ltd. | DC-DC converter |
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| CN101888734A (en) * | 2009-05-13 | 2010-11-17 | 通用电气公司 | Electronic ballast of belt lifting/voltage reducing power-factor correction DC-DC converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098730A (en) * | 2019-06-11 | 2019-08-06 | 阳光电源股份有限公司 | A kind of three-level Boost converter, control method and photovoltaic system |
| CN110165888A (en) * | 2019-06-11 | 2019-08-23 | 阳光电源股份有限公司 | Three level Boost circuits, multiple-channel output parallel system |
| CN110572026A (en) * | 2019-09-26 | 2019-12-13 | 特变电工西安电气科技有限公司 | Clamp type three-level boost power conversion circuit |
| US11870346B2 (en) | 2019-12-20 | 2024-01-09 | Huawei Digital Power Technologies Co., Ltd. | DC-DC converter |
| CN116247917A (en) * | 2023-05-10 | 2023-06-09 | 深圳市首航新能源股份有限公司 | Flying capacitor three-level Boost balance circuit and control method |
| CN116247917B (en) * | 2023-05-10 | 2023-08-29 | 深圳市首航新能源股份有限公司 | Flying capacitor three-level Boost balance circuit and control method |
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Application publication date: 20190510 |