CN109586574A - A kind of three-level buck circuit and its control method - Google Patents
A kind of three-level buck circuit and its control method Download PDFInfo
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- CN109586574A CN109586574A CN201910091934.3A CN201910091934A CN109586574A CN 109586574 A CN109586574 A CN 109586574A CN 201910091934 A CN201910091934 A CN 201910091934A CN 109586574 A CN109586574 A CN 109586574A
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- power switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Dc-Dc Converters (AREA)
Abstract
It includes: DC power supply DC, energy converter, inlet highway filter capacitor C1, inlet highway filter capacitor C2, power switch tube Q1, power switch tube Q2, the junction capacity C3 of power switch tube Q1, the junction capacity C4 of power switch tube Q2, capacitor C5, power diode D1, power diode D2, power diode D3, capacitor C6 and filter inductance L1 that the present invention, which discloses a kind of three-level buck circuit and its control method, the circuit,.The present invention will be exported in energy transfer to total bus extra on bus filter capacitor C2 by energy converter, be ensure that output bus filter capacitor C1 and is exported the electric voltage equalization on bus filter capacitor C2.The present invention not only controls simply, common mode interference is not present, and at low cost, is suitable for promoting and applying.
Description
Technical field
The present invention relates to field of power electronics more particularly to a kind of three-level buck circuit and its control methods.
Background technique
In power electronics topology, Buck circuit is a kind of most basic DC/DC topology, is applied to various electric power
In electronic equipment.For low-pressure system, two level Buck can satisfy resistance to pressure request, but for more high input voltage, due to
General power tube is mostly low-voltage device in the market, and high tension apparatus price is several times of low-voltage device, and two level Buck are
Through being difficult to meet resistance to pressure request.Present three-level buck circuit includes: symmetrical buck three-level buck circuit, three electricity of striding capacitance
Pancake volt circuit.Wherein, one, symmetrical Buck three-level buck circuit: the topology and driver' s timing of symmetrical buck reduction voltage circuit are such as
Shown in Fig. 1 and Fig. 2, switching tube Q1 and switching tube Q2 do not ensure that and meanwhile turn on and off, and in capacitor C1 and capacitor C2
When mid-point voltage is devious, the driver' s timing of regulating switch pipe Q1 and switching tube Q2 are needed to stablize capacitor C1's and capacitor C2
Mid-point voltage, cause output voltage over the ground between there are common mode interference is formed between serious common-mode signal and the earth, cause very
High leakage current influences the normal work of system, and symmetrical Buck three-level buck topology needs two inductance, needs two-way independent
Driving circuit, these also both increase system cost.Two, three level buck circuit of striding capacitance: three level of striding capacitance
The topology and driver' s timing of buck circuit are as shown in Figure 3 and Figure 4, although common mode interference problem is not present in three level of striding capacitance,
But three level of striding capacitance need to fly across capacitor C5 be pre-charged, pre-charge circuit design comparison is complicated, and steady
When state works, the voltage on capacitor C5 is at every moment controlled, control is cumbersome, and the capacitance of capacitor C5 is bigger, and cost also compares
Height, tri- level of striding capacitance Buck 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 three-level buck 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 three-level buck circuit, the circuit include: DC power supply DC, energy converter, inlet highway filter capacitor
C1, inlet highway filter capacitor C2, power switch tube Q1, power switch tube Q2, power switch tube Q1 junction capacity C3, power open
Close junction capacity C4, capacitor C5, power diode D1, power diode D2, power diode D3, capacitor C6 and the filtering of pipe Q2
Inductance L1；The energy converter is attempted by the both ends DC power supply DC, and anode and the inlet highway of the DC power supply DC filters
The collector connection of one end, power switch tube Q1 of capacitor C1, the cathode of DC power supply DC is with inlet highway filter capacitor C2's
One end connection of one end, the anode of power diode D2, capacitor C6, the other end and energy of inlet highway filter capacitor C1 are converted
The anode connection of device, the other end of inlet highway filter capacitor C2, power diode D3, the cathode and power of power diode D3
The collector connection of the emitter of switching tube Q1, one end of capacitor C5, power switch tube Q2, junction capacity C3 are attempted by power switch
Between the collector and emitter of pipe Q1, junction capacity C4 is attempted by between the collector and emitter of power switch tube Q2, capacitor
The other end of C5 is connect with the cathode of the anode of power diode D1, power diode D2, the other end and filtered electrical of capacitor C6
Feel one end connection of L1, the other end and the cathode of power diode D1, the emitter of power switch tube Q2 of filter inductance L1 connects
It connects.
Based on above-mentioned three-level buck circuit, the invention also discloses a kind of three-level buck 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, and 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；The gate drive voltage of power switch tube Q1 and power switch tube Q2 are in original state
It is all low level, into the t1 period, when digital signal processor (DSP) is to one high level letter of gate pole of power switch tube Q2
Number when, power switch tube Q2 is open-minded, current loop at this time are as follows: inlet highway filter capacitor C2- power diode D3- power is opened
Close pipe Q2- filter inductance L1- capacitor C6；After the t1 time, one high level signal of gate pole of DSP to power switch tube Q1, power
Switching tube Q1 is open-minded, current loop at this time are as follows: inlet highway filter capacitor C2- inlet highway filter capacitor C1- power switch
A period of time is connected in pipe Q1- power switch tube Q2- filter inductance L1- capacitor C6, power switch tube Q1 and power switch tube Q2, this
In the section time, filter inductance L1 energy storage, then power switch tube Q1 is turned off, and current loop at this time is: inlet highway filtered electrical
Hold C2- power diode D3- power switch tube Q2- filter inductance L1- capacitor C6, into the t2 period, DSP is to power switch tube
One low level signal of gate pole of Q2, power switch tube Q2 shutdown, current loop at this time: filter inductance L1- capacitor C6- power
Diode D2- power diode D1；Since power switch tube Q1 and power switch tube Q2 drives during turning on and off
There is dead time, in the t1+t2 period in each period, inlet highway filter capacitor C2 is discharged than inlet highway filter capacitor C1
Energy is more, and the energy of total inlet highway is supplemented the energy discharged to inlet highway filter capacitor C2 by conversion by energy converter more
Amount, it is ensured that the electric voltage equalization on inlet highway filter capacitor C1 and inlet highway filter capacitor C2.
Three-level buck circuit proposed by the present invention and its control method will output bus filtered electricals by energy converter
Hold in energy transfer to total bus extra on C2, ensure that on output bus filter capacitor C1 and output bus filter capacitor C2
Electric voltage equalization.The present invention not only controls simply, common mode interference is not present, and at low cost, is suitable for promoting and applying.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of symmetrical buck three-level buck circuit；
Fig. 2 is the Topology Driven timing of symmetrical buck three-level buck circuit；
Fig. 3 is the topological structure schematic diagram of striding capacitance three-level buck circuit；
Fig. 4 is striding capacitance three-level buck circuit topology driver' s timing；
Fig. 5 is three-level buck 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 three-level buck circuit structure diagram provided in an embodiment of the present invention.
Three-level buck circuit specifically includes in the present embodiment: DC power supply DC, energy converter, inlet highway filtered electrical
Hold junction capacity C3, the power of C1, inlet highway filter capacitor C2, power switch tube Q1, power switch tube Q2, power switch tube Q1
Junction capacity C4, capacitor C5, power diode D1, power diode D2, power diode D3, capacitor C6 and the filter of switching tube Q2
Wave inductance L1；The energy converter is attempted by the both ends DC power supply DC, and anode and the inlet highway of the DC power supply DC is filtered
The collector connection of one end, power switch tube Q1 of wave capacitor C1, the cathode and inlet highway filter capacitor C2 of DC power supply DC
One end, the anode of power diode D2, capacitor C6 one end connection, the other end and energy of inlet highway filter capacitor C1 turn
The anode connection of parallel operation, the other end of inlet highway filter capacitor C2, power diode D3, the cathode and function of power diode D3
The collector connection of the emitter of rate switching tube Q1, one end of capacitor C5, power switch tube Q2, junction capacity C3 are attempted by power and open
Between the collector and emitter for closing pipe Q1, junction capacity C4 is attempted by between the collector and emitter of power switch tube Q2, electricity
The other end for holding C5 is connect with the cathode of the anode of power diode D1, power diode D2, the other end of capacitor C6 and filtering
One end of inductance L1 connects, the other end and the cathode of power diode D1, the emitter of power switch tube Q2 of filter inductance L1
Connection.Capacitor C5 provides a continuous current circuit for the parasitic inductance in circuit in the present embodiment, prevents power switch tube Q1
With the unbalanced-voltage-division of power switch tube Q2；The sample circuit of energy converter by real time acquire inlet highway filter capacitor C1,
Voltage on inlet highway filter capacitor C2, when the voltage on inlet highway filter capacitor C2 is not the half of DC power supply DC
When, the energy of total inlet highway is just transformed on inlet highway filter capacitor C2 by energy converter, to guarantee that input is female
The equilibrium of line filter capacitor C1, inlet highway filter capacitor C2.Energy converter preferentially uses balancing circuitry in the present embodiment.
The present embodiment also discloses a kind of control method of above-mentioned three-level buck circuit, and three level drop in the present embodiment
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,
The gate drive voltage of power switch tube Q1 and power switch tube Q2 are low level；In the t1 period, power switch tube Q1's
Gate drive voltage be high level, power switch tube Q2 gate drive voltage be low level；Later, power switch tube Q1 and function
The gate drive voltage of rate switching tube Q2 is high level；In the t2 period, the gate drive voltage of power switch tube Q1 is height
Level, power switch tube Q2 gate drive voltage be low level；The gate-drive of power switch tube Q1 and power switch tube Q2
Voltage is all low level in original state, into the t1 period, when digital signal processor (DSP) gives the door of power switch tube Q2
When one high level signal in pole, power switch tube Q2 is open-minded, current loop at this time are as follows: inlet highway filter capacitor C2- power
Diode D3- power switch tube Q2- filter inductance L1- capacitor C6；After the t1 time, gate pole one to power switch tube Q1 of DSP
High level signal, power switch tube Q1 are open-minded, current loop at this time are as follows: the filtering of inlet highway filter capacitor C2- inlet highway
Capacitor C1- power switch tube Q1- power switch tube Q2- filter inductance L1- capacitor C6, power switch tube Q1 and power switch tube Q2
For a period of time, in this period, filter inductance L1 energy storage, then power switch tube Q1 is turned off, and current loop at this time is for conducting:
Inlet highway filter capacitor C2- power diode D3- power switch tube Q2- filter inductance L1- capacitor C6, into the t2 period,
One low level signal of gate pole of DSP to power switch tube Q2, power switch tube Q2 shutdown, current loop at this time: filtered electrical
Feel L1- capacitor C6- power diode D2- power diode D1；Since power switch tube Q1 and power switch tube Q2 driving is being opened
There is dead time during logical and shutdown, in the t1+t2 period in each period, the input of inlet highway filter capacitor C2 ratio is female
Line filter capacitor C1 releases energy more, and energy converter gives the energy of total inlet highway to inlet highway filter capacitor by conversion
The C2 supplement energy discharged, it is ensured that the electric voltage equalization on inlet highway filter capacitor C1 and inlet highway filter capacitor C2 more.
Technical solution of the present invention is arrived by energy converter by energy transfer extra on bus filter capacitor C2 is exported
On total bus, it ensure that output bus filter capacitor C1 and export the electric voltage equalization on bus filter capacitor C2.The present invention is not only
Control is simple, common mode interference is not present, and at low cost, is suitable for promoting and applying.
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 three-level buck circuit characterized by comprising DC power supply DC, energy converter, inlet highway filtered electrical
Hold junction capacity C3, the power of C1, inlet highway filter capacitor C2, power switch tube Q1, power switch tube Q2, power switch tube Q1
Junction capacity C4, capacitor C5, power diode D1, power diode D2, power diode D3, capacitor C6 and the filter of switching tube Q2
Wave inductance L1；The energy converter is attempted by the both ends DC power supply DC, and anode and the inlet highway of the DC power supply DC is filtered
The collector connection of one end, power switch tube Q1 of wave capacitor C1, the cathode and inlet highway filter capacitor C2 of DC power supply DC
One end, the anode of power diode D2, capacitor C6 one end connection, the other end and energy of inlet highway filter capacitor C1 turn
The anode connection of parallel operation, the other end of inlet highway filter capacitor C2, power diode D3, the cathode and function of power diode D3
The collector connection of the emitter of rate switching tube Q1, one end of capacitor C5, power switch tube Q2, junction capacity C3 are attempted by power and open
Between the collector and emitter for closing pipe Q1, junction capacity C4 is attempted by between the collector and emitter of power switch tube Q2, electricity
The other end for holding C5 is connect with the cathode of the anode of power diode D1, power diode D2, the other end of capacitor C6 and filtering
One end of inductance L1 connects, the other end and the cathode of power diode D1, the emitter of power switch tube Q2 of filter inductance L1
Connection.
2. a kind of three-level buck circuit control method, which is characterized in that this method comprises: power switch tube Q1, power switch
The driver' s timing of pipe Q2 are as follows: in each period, original state, the gate drive voltage of power switch tube Q1 and power switch tube Q2
It is low level；In the t1 period, the gate drive voltage of power switch tube Q1 is the gate pole drive of high level, power switch tube Q2
Dynamic voltage is low level；Later, the gate drive voltage of power switch tube Q1 and power switch tube Q2 are high level；The t2 time
Section in, the gate drive voltage of power switch tube Q1 be high level, power switch tube Q2 gate drive voltage be low level；Function
The gate drive voltage of rate switching tube Q1 and power switch tube Q2 are all that low level into the t1 period works as number in original state
When word signal processor (DSP) gives one high level signal of gate pole of power switch tube Q2, power switch tube Q2 is open-minded, at this time
Current loop are as follows: inlet highway filter capacitor C2- power diode D3- power switch tube Q2- filter inductance L1- capacitor C6；t1
After time, DSP is to one high level signal of gate pole of power switch tube Q1, and power switch tube Q1 is open-minded, current loop at this time
Are as follows: inlet highway filter capacitor C2- inlet highway filter capacitor C1- power switch tube Q1- power switch tube Q2- filter inductance
L1- capacitor C6, power switch tube Q1 and power switch tube Q2 are connected for a period of time, in this period, filter inductance L1 energy storage, so
Power switch tube Q1 is turned off afterwards, and current loop at this time is: inlet highway filter capacitor C2- power diode D3- power switch
Pipe Q2- filter inductance L1- capacitor C6, into t2 period, one low level signal of gate pole of DSP to power switch tube Q2, function
Rate switching tube Q2 shutdown, current loop at this time: filter inductance L1- capacitor C6- power diode D2- power diode D1；By
There is dead time during turning on and off in power switch tube Q1 and power switch tube Q2 driving, in the t1 in each period
+ t2 period, inlet highway filter capacitor C2 release energy more than inlet highway filter capacitor C1, and energy converter will be inputted always
The energy of bus supplements the energy discharged to inlet highway filter capacitor C2 by conversion more, it is ensured that inlet highway filter capacitor C1
With the electric voltage equalization on inlet highway filter capacitor C2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910091934.3A CN109586574A (en) | 2019-01-30 | 2019-01-30 | A kind of three-level buck circuit and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910091934.3A CN109586574A (en) | 2019-01-30 | 2019-01-30 | A kind of three-level buck circuit and its control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020162984A1 (en) * | 2019-09-25 | 2020-08-13 | Huawei Administration Building Bantian | Wide-voltage-range dc-dc converters |
| CN114583957A (en) * | 2022-03-22 | 2022-06-03 | 华北电力大学 | Three-level converter and control method and control device thereof |
| CN114888373A (en) * | 2022-06-01 | 2022-08-12 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
| US11817783B2 (en) | 2020-06-30 | 2023-11-14 | Astec International Limited | Controlling reverse current in switched mode power supplies to achieve zero voltage switching |
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| CN109067148A (en) * | 2018-08-14 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of more level buck circuits |
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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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| CN114888373B (en) * | 2022-06-01 | 2023-09-29 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
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