CN106169868B - The DC converter topology and its feed-forward type Average Current Control method of width input - Google Patents

The DC converter topology and its feed-forward type Average Current Control method of width input Download PDF

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Publication number
CN106169868B
CN106169868B CN201610846426.8A CN201610846426A CN106169868B CN 106169868 B CN106169868 B CN 106169868B CN 201610846426 A CN201610846426 A CN 201610846426A CN 106169868 B CN106169868 B CN 106169868B
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China
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signal
adder
input
buck
switch
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CN106169868A (en
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颜湘武
王杨
葛小凤
张波
徐恒波
刘正男
任亚龙
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Baoding Shangyuan Power Technology Co Ltd
North China Electric Power University
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Baoding Shangyuan Power Technology Co Ltd
North China Electric Power University
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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
    • H02M3/157—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 with digital control
    • 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
    • H02M3/1582—Buck-boost converters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention belongs to applied power electronics technical field, in particular to the DC converter topology and its feed-forward type Average Current Control method of a kind of wide input.Wide input direct-current converter topology includes two-tube One Buck-Boost converter body and the two-tube One Buck-Boost converter body of crisscross parallel type.Feed-forward type Average Current Control method suitable for it is made of input voltage feed forward module, mode switch module, outer voltage and current inner loop.This method passes through the current inner loop that introduces input voltage feed forward in Average Current Control, calculate the feedforward function of input voltage feed forward to current inner loop, and abbreviation is carried out, the feed-forward type Average Current Control for being suitble to practical application is obtained, input dynamic response performance of the converter in entire input voltage range is substantially increased；Interleaving technique effectively reduces output current ripple while increasing transformation capacity, and the field for wide scope input, high-power transformation provides support.

Description

The DC converter topology and its feed-forward type Average Current Control method of width input
Technical field
The invention belongs to applied power electronics technical field, in particular to a kind of DC converter of wide input is topological and its preceding Feedback type Average Current Control method.
Background technique
With the continuous development of semiconductor technology, the power that semiconductor devices can bear is increasing, is made of it DC converter is more and more important in field of power supplies institute role.It is new in solar power generation, tidal power generation, fuel cell etc. Energy power field, which receives, to be widely applied, but the output voltage of these grid-connected power generation systems can due to environment temperature, Biggish fluctuation occurs for the variation of the conditions such as weather, usually can be too low or too high, to exceed defined input voltage range. It in order to protect subsequent equipment not damaged, therefore cannot make whole system work under maximum power generation mode, and cause energy The waste in source.It the use of the DC/DC converter with wide scope input function is that solution grid-connected power generation system output pulsation is larger A kind of effective means.Wherein buck DC/DC converter boosts due to having when input voltage is lower, and in input voltage The characteristics of being depressured when higher is widely used in the occasion for needing wide scope to input.Traditional buck-boost converter circuit topology In all only include a switching tube, traditional Buck and Boost are become so as to cause the voltage and current stress of its switching tube Parallel operation is much higher, and the input and output polarity of certain converters is on the contrary, their switching loss and required inductance simultaneously It is also very big with the energy-storage travelling wave tubes such as capacitor, be not suitable for very much being applied to the powerful occasions of high voltages such as grid-connected power generation system.
Two-tube One Buck-Boost converter body can work under Buck Boost mode since there are two switching tubes for its tool, Its switch tube voltage and current stress and switching loss and inductance, the size of capacitor and traditional Buck and Boost electricity simultaneously Road is all identical, so that the application in grid-connected power generation system is increasingly taken seriously.But this converter becomes in input voltage It is larger to change range, when operating mode being caused to switch, a biggish impact can be generated on the output voltage, rear class is gently then influenced and set The normal work of standby and converter itself, it is heavy then may cause converter itself and subsequent equipment and burn, make entire electricity generation system Paralysis, while its achievable transform power is also smaller.
Summary of the invention
To solve the above-mentioned problems, the invention discloses a kind of DC converter topologys of wide input, which is characterized in that packet Include two-tube One Buck-Boost converter body and the two-tube One Buck-Boost converter body of crisscross parallel type both topological structures；
The main circuit structure of the two-tube One Buck-Boost converter body are as follows: anode and the first switch mosfet of input power Pipe S1Drain electrode be connected；, the first switch mosfet pipe S1Source electrode respectively with the first silicon carbide diode D1Cathode and inductance L Input side be connected；First silicon carbide diode D1Anode be directly connected with the cathode of input power；The outlet side of inductance L is then With the second switch mosfet pipe S2Drain electrode and the second silicon carbide diode D2Anode be connected；, the second switch mosfet pipe S2's The cathode of source electrode and input power is connected directly；Second silicon carbide diode D2Cathode with output lateral capacitance C anode be connected； The cathode of output lateral capacitance C is directly connected with the cathode of input power；The anode of lateral capacitance C is exported just as converter output Anode, the cathode that cathode, that is, input power cathode of capacitor C is exported as converter；
The main circuit topological structure of the two-tube One Buck-Boost converter body of crisscross parallel type are as follows: input power anode with First switch mosfet pipe S1Drain electrode be connected；First switch mosfet pipe S1Source electrode respectively with the first silicon carbide diode D1 Cathode be connected with the input side of inductance first L；First silicon carbide diode D1Anode be directly connected with the cathode of input power； Anode and the third switch mosfet pipe S of input power1' drain electrode be connected；Third switch mosfet pipe S1' source electrode respectively with The cathode of third silicon carbide diode D' is connected with the input side of inductance second L'；Third silicon carbide diode D' anode directly with The cathode of input power is connected；The outlet side of inductance first L and inductance second L' respectively with the second switch mosfet pipe S2Drain electrode and Second silicon carbide diode D2Anode be connected；Second switch mosfet pipe S2Source electrode and the cathode of input power be connected directly； Second silicon carbide diode D2Cathode with output lateral capacitance C anode be connected；The cathode for exporting lateral capacitance C is directly electric with input The cathode in source is connected；Export the anode that the anode of lateral capacitance C is just exported as converter, cathode, that is, input power of capacitor C The cathode that cathode is exported as converter.
The input power is grid-connected power generation system or the DC power supply that battery supply exports.
The converter output is directly connected to various resistive loads, also can directly be connected with inverter DC terminal.
Suitable for the feed-forward type Average Current Control system of two-tube One Buck-Boost converter body, input voltage is passed through into feedforward After the processing of module, the current inner loop of Average Current Control is added to, quickly inhibits input voltage disturbance to the shadow of output voltage It rings, specifically: the first subtracter 1-1, voltage regulator 1-2, the second subtracter 1-3, current regulator 1-4 are sequentially connected, electricity The output end of throttle regulator 1-4 is connect with the input terminal of the input terminal of first adder 1-5, third adder 1-7 respectively, and first Adder 1-5, second adder 1-6, first comparator 1-8 and S1Drive module 1-10 is sequentially connected, third adder 1-7, Second comparator 1-9 and S2Drive module 1-11 is sequentially connected, and the output end of the first input voltage feed forward function module 1-12 connects It is connected to the input terminal of second adder 1-6, the output end of the second input voltage feed forward function module 1-13 is connected to third addition The input terminal of device 1-7；The input translator output voltage signal v in the first subtracter 1-1oWith given outlet side voltage value vref, the current signal i obtained at the inductance from converter is inputted in the second subtracter 1-3L, defeated in first adder 1-5 Enter given offset signal ubias, the feedforward amount v of the modulated signal of Buck switch is inputted in second adder 1-61, The feedforward amount v of the modulated signal of Boost switch is inputted in three adder 1-72；From S1Drive module 1-10 output driving S1High frequency The switching drive signal of switch, from S2Drive module 1-11 output driving S2The switching drive signal of HF switch；Two-tube Buck- First switch mosfet pipe S of Boost1Grid and S1Drive module 1-10 is connected, two-tube One Buck-Boost converter body The second switch mosfet pipe S2Grid and S2Drive module 1-11 is connected.
The voltage regulator 2, current regulator 4, current regulator 5, current regulator 6 are all proportional, integral PI tune Save device.
Suitable for the feed-forward type Average Current Control system of the two-tube One Buck-Boost converter body of crisscross parallel type, by input electricity The current inner loop that Average Current Control has been added to after the processing that pressure passes through feed-forward module quickly inhibits input voltage disturbance to defeated The influence of voltage out, specifically: the first subtracter 2-1 and voltage regulator 2-2 is interconnected, the second subtracter 2-3 and electric current Adjuster 2-5 is interconnected, and third subtracter 2-4 and current regulator 2-6 are interconnected；Second subtracter 2-3 and third subtract The input terminal of musical instruments used in a Buddhist or Taoist mass 2-4 is connected with the output end of voltage regulator 2-2；The output end of current regulator 2-5 adds with first respectively The input terminal connection of the input terminal, fifth adder 2-11 of musical instruments used in a Buddhist or Taoist mass 2-7, the output end and second adder of current regulator 2-6 The input terminal of 2-8 is connected；First adder 2-7, third adder 2-9, first comparator 2-12 and S1Drive module 2-16 according to Secondary connection, second adder 2-8, the 4th adder 2-10, the second comparator 2-13 and S1' drive module 2-17 is sequentially connected, Fifth adder 2-11, third comparator 2-14, S2Drive module 2-19 is sequentially connected；First input voltage feed forward function module The output end of 2-15 is connected to the input terminal of third adder 2-9 and the 4th adder 2-10, the second input voltage feed forward function The output end of module 2-19 is connected to the input terminal of fifth adder 2-11；Input translator exports in the first subtracter 2-1 Voltage signal and given outlet side voltage value, the electricity that input obtains at the inductance first L of converter in the second subtracter 2-3 Signal is flowed, the current signal that input obtains at the inductance second L' of converter in third subtracter 2-4, in first adder 2- Input given offset signal in 7 and second adder 2-8, output signal in first adder 2-7 and second adder 2-8 It respectively corresponds in input third adder 2-9 and the 4th adder 2-10, in third adder 2-9 and the 4th adder 2-10 The also feed-forward signal v of input Buck switch1, the feed-forward signal v of Boost switch is inputted in fifth adder 2-112, feedovering Input translator input voltage signal in function module 2-15 and feedforward function module 2-18；The output of first comparator 2-12 is believed Number pass through S1First switch mosfet pipe S of the two-tube One Buck-Boost converter body of drive module 2-16 output driving crisscross parallel type1 Switching drive signal, the output signal of the second comparator 2-13 passes through S1' drive module 2-17 output driving crisscross parallel type The third switch mosfet pipe S of two-tube One Buck-Boost converter body1' switching drive signal, the output of third comparator 2-14 Signal passes through S2Second switch mosfet of the two-tube One Buck-Boost converter body of drive module 2-19 output driving crisscross parallel type Pipe S2Switching drive signal；The voltage regulator 2-2, current regulator 2-5, current regulator 2-6 are proportional, integral Adjuster.
The control method of the feed-forward type Average Current Control system suitable for two-tube Buck-Boos converter, It is characterized in that, specific steps are as follows:
1) converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefPass through First subtracter 1-1, makes the difference to form error signal vw, it is sent into voltage regulator 1-2, obtains the output signal v of voltage regulatori； First subtracter 1-1 and voltage regulator 1-2 constitutes outer voltage；
2) the current signal i obtained from the inductance of converterL, output signal v with voltage regulator 1-2iPass through second Subtracter 1-3 makes the difference to form error signal iw, it is sent into current regulator 1-4, obtains the output signal v of current regulatorc；Second Subtracter 1-3 and current regulator 1-4 collectively form current inner loop；
3) the input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward Function Modules Block 1-12 and the second input voltage feed forward function module 1-13 processing respectively obtains the feedforward amount v of the modulated signal of Buck switch1 With the feedforward amount v of the modulated signal of Boost switch2, this two signals are sent to second adder 1-6 and third adder respectively 1-7；First input voltage feed forward function module 1-12 and the second input voltage feed forward function module 1-13 and second adder 1-6 and third adder 1-7 collectively form input voltage feed forward module；
4) the output signal v of current regulator 1-4cPoint two-way, all the way with given offset signal ubiasBelieve with feedforward amount Number v1It is added by first adder 1-5, obtains the preliminary modulated signal of Buck switch, passing through second adder 1-6 and tune The feedforward amount v of signal processed1It is added and obtains the modulated signal v of Buck switchBuck；The feedforward amount v of another way and modulated signal2Pass through The feedforward amount v of third adder 1-7 and modulated signal2It is added and obtains the modulated signal v of Boost switchBoost；Given offset Signal ubiasWith first adder 1-5 constitute mode switch module, the control method between Buck and Boost mode from Dynamic switching is partially completed by this；
5) modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 1-8, control switch S is obtained1Open OFF signal, switching signal are directly sent to S1Drive module 1-10, by S1The switch driving obtained after the amplification of drive module 1-10 Signal is fed directly to the first switch mosfet pipe S1Grid, open and turn off for controlling it；
6) modulated signal vBoostAfter compared with high frequency triangle wave is by the second comparator 1-9, control switch S is obtained2's Switching signal, switching signal are directly sent to S2Drive module 1-11, by S2The switch obtained after the amplification of drive module 1-11 drives Dynamic signal is fed directly to the second switch mosfet pipe S2Grid, control it and turn on and off.
The control of the feed-forward type Average Current Control system suitable for the two-tube Buck-Boos converter of crisscross parallel type Method processed, which is characterized in that specific steps are as follows:
1) converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefPass through First subtracter 2-1, makes the difference to form error signal vw, it is sent into voltage regulator 2-2, obtains the output signal v of voltage regulatori； First subtracter 2-1 and voltage regulator 2-2 constitutes outer voltage；
2) the current signal i obtained from the inductance first L of converterL, output signal v with voltage regulator 2-2iPass through Second subtracter 2-3, makes the difference to form error signal iw, it is sent into current regulator 2-5, obtains the output signal v of current regulatorc； Second subtracter 2-3 and current regulator 2-5 collectively form current inner loop 2-1；
3) the current signal i ' obtained from the inductance second L ' of converterL, output signal v with voltage regulator 2-2iIt is logical Third subtracter 2-4 is crossed, makes the difference to form error signal i 'w, it is sent into current regulator 2-6, obtains the output letter of current regulator Number v 'c；Third subtracter 2-4 and current regulator 2-6 collectively form current inner loop 2-2；
4) the input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward Function Modules Block 2-15 and the second input voltage feed forward function module 2-18 processing, respectively obtains the first switch mosfet pipe S1And third Switch mosfet pipe S '1Modulated signal feedforward amount v1With the second switch mosfet pipe S2Modulated signal feedforward amount v2, this Two signals are sent to third adder 2-9, the 4th adder 2-10 and fifth adder 2-11 respectively；First input voltage feed forward Function module 2-15 and the second input voltage feed forward function module 2-18 and third adder 2-9, the 4th adder 2-10 and Fifth adder 2-11 collectively forms input voltage feed forward module；
5) the output signal v of voltage regulator 2-2iDivide two-way, is connected all the way with the input side of the second subtracter 2-3, separately Then it is connected all the way with the input side of third subtracter 2-4；
6) the output signal v of current regulator 2-5cPoint two-way, all the way with given offset signal ubiasAdd by first Musical instruments used in a Buddhist or Taoist mass 2-7 is added, and obtains the first switch mosfet pipe S1Preliminary modulated signal, then by third adder 2-9 and modulation believe Number feedforward amount v1Addition obtains the first switch mosfet pipe S1Modulated signal vBuck；The feedforward amount of another way and modulated signal v2Pass through the feedforward amount v of fifth adder 2-11 and modulated signal2Addition obtains Boost switch S2Modulated signal vBoost；Electric current The output signal v ' of adjuster 2-68cWith given offset signal ubiasIt is added by second adder 2-8, obtains third Switch mosfet pipe S '1Preliminary modulated signal, then pass through the feedforward amount v of the 4th adder 2-10 and modulated signal1Addition obtains Third switch mosfet pipe S '1Modulated signal v 'Buck；Given offset signal ubiasAdd with first adder 2-7, second Musical instruments used in a Buddhist or Taoist mass 2-8 together constitutes mode switch module, automatic switchover of the control method between Buck and Boost mode be by What this was partially completed；
7) modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 2-12, obtains the first MOSFET and open Close pipe S1Switching signal, switching signal is directly sent to S1Drive module 2-16, by S1It is obtained after the amplification of drive module 2-16 Switching drive signal be fed directly to the first switch mosfet pipe S1Grid, open and turn off for controlling it；
8) modulated signal v 'BuckAfter compared with high frequency triangle wave is by the second comparator 2-13, the 3rd MOSFET is obtained Switching tube S '1Switching signal, be sent into the high frequency triangle wave of the second comparator 2-13 and be sent into first comparator 2-12 and third The high frequency triangle wave of comparator 2-14 phase difference of pi in phase, namely half of switch periods of difference；Obtained switching signal is directly sent To S '1Drive module 2-17, by S '1Switching drive signal, which is obtained, after the amplification of drive module 2-17 is fed directly to third Switch mosfet pipe S '1Grid, open and turn off for controlling it；
9) modulated signal vBoostAfter compared with high frequency triangle wave is by third comparator 2-14, obtains the 2nd MOSFET and open Close pipe S2Switching signal, be sent into third comparator 2-14 high frequency triangle wave and be sent into first comparator 2-12 high frequency triangle Wave is identical；Obtained switching signal is directly sent to S2Drive module 2-19, by S2It is obtained after the amplification of drive module 2-19 Switching drive signal be fed directly to the second switch mosfet pipe S2Grid, control it and turn on and off.
Beneficial effect
The present invention, can be in reality by using feed-forward type Average Current Control method in two-stage One Buck-Boost converter body While existing wide scope input, the input dynamic response performance of converter is effectively improved.Become suitable for two-tube Buck-Boost The feed-forward type Average Current Control system of parallel operation and the two-tube One Buck-Boost converter body of crisscross parallel type contains average current control The outer voltage of system and the double circle structure of current inner loop and input voltage feed forward module and mode switch module.Voltage and The double circle structure of electric current compared with the control of the voltage mode of univoltage ring structure, peak value comparison method etc., have it is preferable it is quiet, Dynamic response performance, stronger anti-interference ability, duty ratio are not necessarily to slope compensation, can be accurately controlled inductance when being greater than 0.5 Electric current is easy to implement the advantages such as the control to inductive current；Mode switch module can be realized two-stage One Buck-Boost converter body The automatic switchover of converter Buck mode and Boost mode is carried out according to the variation of input voltage；Feed-forward module will be by that will input Electric voltage feed forward is introduced into the current inner loop of Average Current Control, also can be more while greatly simplifying feedforward function expression formula Influence of the fast inhibition input voltage fluctuation to output voltage, it is defeated under Buck and Boost mode to not only increase converter Enter dynamic responding speed, output voltage when converter also being inhibited to switch between Buck and Boost both of which well Impact, realizes smoothly switching for variator two-mode；Feedforward suitable for the two-tube One Buck-Boost converter body of crisscross parallel type Type Average Current Control system can also realize the stream of two shunt inductances, prevent it while with the above beneficial effect In all the way inductance burnt because undertaking more load.Two-stage One Buck-Boost converter body while with stepping functions, with Traditional buck-boost converter is compared, and circuit topological structure is simple, and switching voltage stress is low, facilitates the expansion for carrying out capacity It the beneficial effects such as fills, can be good at adapting to current wide scope input, high-power, high frequency field requirement.
Detailed description of the invention:
Fig. 1 is two-tube One Buck-Boost converter body main circuit topology；
Fig. 2 is the feed-forward type Average Current Control system construction drawing for two-tube One Buck-Boost converter body of the invention.
Fig. 3 is the two-tube One Buck-Boost converter body of crisscross parallel type disclosed by the invention
Fig. 4 is the feed-forward type Average Current Control suitable for the two-tube One Buck-Boost converter body of crisscross parallel type of the invention System block diagram.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawing.
Fig. 1 show the feed-forward type Average Current Control system disclosed by the invention for two-tube One Buck-Boost converter body And the main topology of applicable circuit of method.Its specific structure is as follows: input power is grid-connected power generation system, battery supply output DC power supply or the biggish DC power supply of other fluctuation ranges.Anode and the first switch mosfet pipe S of input power1Leakage Extremely it is connected；, the first switch mosfet pipe S1Source electrode respectively with the first silicon carbide diode D1Cathode and inductance first L input Side is connected；First silicon carbide diode D1Anode be directly connected with the cathode of input power；The outlet side of inductance first L is then with Two switch mosfet pipe S2Drain electrode and the second silicon carbide diode D2Anode be connected；, the second switch mosfet pipe S2Source electrode It is connected directly with the cathode of input power；Second silicon carbide diode D2Cathode with output lateral capacitance C anode be connected；Output The cathode of lateral capacitance C is directly connected with the cathode of input power；The anode for exporting lateral capacitance C just exports just as converter Pole, the cathode that cathode, that is, input power cathode of capacitor C is exported as converter；Converter outlet side is directly connected to various resistances Property load, also can be directly connected directly with inverter DC terminal.
Fig. 2 show the structure chart of the feed-forward type Average Current Control system for two-tube One Buck-Boost converter body.
Converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefPass through One subtracter 1-1, makes the difference to form error signal vw, it is sent into voltage regulator 1-2, obtains the output signal v of voltage regulatori；The One subtracter 1-1 and voltage regulator 1-2 constitutes outer voltage；
The current signal i obtained from the inductance of converterL, output signal v with voltage regulator 1-2iSubtract by second Musical instruments used in a Buddhist or Taoist mass 1-3 makes the difference to form error signal iw, it is sent into current regulator 1-4, obtains the output signal v of current regulatorc；Second subtracts Musical instruments used in a Buddhist or Taoist mass 1-3 and current regulator 1-4 collectively form current inner loop；
The input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward function module 1-12 and the second input voltage feed forward function module 1-13 processing respectively obtains the feedforward amount v of the modulated signal of Buck switch1With The feedforward amount v of the modulated signal of Boost switch2, this two signals are sent to second adder 1-6 and third adder 1- respectively 7；First input voltage feed forward function module 1-12 and the second input voltage feed forward function module 1-13 and second adder 1-6 Input voltage feed forward module is collectively formed with third adder 1-7；
First input voltage feed forward function module 1-12 and the second input voltage feed forward function module 1-13 is in tradition Gained is derived according to the structure of control topology on the basis of Buck and Boost small-signal model, expression formula is allThat is:
The output signal v of current regulator 1-4cPoint two-way, all the way with given offset signal ubiasPass through the first addition Device 1-5 is added, and obtains the preliminary modulated signal of Buck switch, in the feedforward amount v for passing through second adder 1-6 and modulated signal1 Obtain the modulated signal v of Buck switchBuck；Another way obtains the modulated signal v of Boost switch by third adder 7Boost； Given offset signal ubiasMode switch module is constituted with first adder 5, the control method is in Buck and Boost mould Automatic switchover between formula is partially completed by this；
Modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 1-8, control switch S is obtained1Switch Signal, switching signal are directly sent to S1Drive module 1-10, by S1Driving S is obtained after the amplification of drive module 1-101High frequency is opened The switching drive signal of pass, this signal are fed directly to switch mosfet pipe S1Grid, open and turn off for controlling it；
Modulated signal vBoostAfter compared with high frequency triangle wave is by the second comparator 1-9, control switch S is obtained2Open OFF signal, switching signal are directly sent to S2Drive module 1-11, by S2Driving S is obtained after the amplification of drive module 1-112High frequency The switching drive signal of switch, this signal are fed directly to switching tube S2Grid, control it and turn on and off.
Fig. 3 show the crisscross parallel type two-tube One Buck-Boost converter body disclosed by the invention suitable for large-power occasions The main topology of circuit.Its specific structure is as follows:
Input power vgThe DC power supply or other fluctuation ranges exported for grid-connected power generation system, battery supply is larger DC power supply.Anode and the first switch mosfet pipe S of input power1Drain electrode be connected；First switch mosfet pipe S1Source Pole respectively with the first silicon carbide diode D1Cathode be connected with the input side of inductance first L；First silicon carbide diode D1Anode Directly it is connected with the cathode of input power；Anode and the third switch mosfet pipe S of input power1' drain electrode be connected；Third Switch mosfet pipe S1' source electrode be connected respectively with the input side of the cathode of third silicon carbide diode D' and inductance second L'；The The anode of three silicon carbide diode D' is directly connected with the cathode of input power；The outlet side of inductance first L and inductance second L' difference With the second switch mosfet pipe S2Drain electrode and the second silicon carbide diode D2Anode be connected；Second switch mosfet pipe S2's The cathode of source electrode and input power is connected directly；Second silicon carbide diode D2Cathode with output lateral capacitance C anode be connected； The cathode of output lateral capacitance C is directly connected with the cathode of input power；The anode of lateral capacitance C is exported just as converter output Anode, the cathode that cathode, that is, input power cathode of capacitor C is exported as converter.Converter outlet side is directly connected to various Resistive load also can be directly connected directly with inverter DC terminal.
It is average that Fig. 4 show the feed-forward type disclosed by the invention suitable for the two-tube One Buck-Boost converter body of crisscross parallel type The structure chart of current control.The specific embodiment of this method are as follows:
1) converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefPass through First subtracter 2-1, makes the difference to form error signal vw, it is sent into voltage regulator 2-2, obtains the output signal v of voltage regulatori； First subtracter 2-1 and voltage regulator 2-2 constitutes outer voltage；
2) the current signal i obtained from the inductance first L of converterL, output signal v with voltage regulator 2-2iPass through Second subtracter 2-3, makes the difference to form error signal iw, it is sent into current regulator 2-5, obtains the output signal v of current regulatorc； Second subtracter 2-3 and current regulator 2-5 collectively form current inner loop 2-1；
3) the current signal i ' obtained from the inductance second L ' of converterL, output signal v with voltage regulator 2-2iIt is logical Third subtracter 2-4 is crossed, makes the difference to form error signal i 'w, it is sent into current regulator 2-6, obtains the output letter of current regulator Number v 'c；Third subtracter 2-4 and current regulator 2-6 collectively form current inner loop 2-2；
4) the input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward Function Modules Block 2-15 and the second input voltage feed forward function module 2-19 processing, respectively obtains the first switch mosfet pipe S1And third Switch mosfet pipe S '1Modulated signal feedforward amount v1With the second switch mosfet pipe S2Modulated signal feedforward amount v2, this Two signals are sent to third adder 2-9, the 4th adder 2-10 and fifth adder 2-11 respectively；First input voltage feed forward Function module 2-15 and the second input voltage feed forward function module 2-19 and third adder 2-9, the 4th adder 2-10 and Fifth adder 2-11 collectively forms input voltage feed forward module；
5) the output signal v of voltage regulator 2-2iDivide two-way, is connected all the way with the input side of the second subtracter 2-3, separately Then it is connected all the way with the input side of third subtracter 2-4；
6) the output signal v of current regulator 2-5cPoint two-way, all the way with given offset signal ubiasAdd by first Musical instruments used in a Buddhist or Taoist mass 2-7 is added, and obtains the first switch mosfet pipe S1Preliminary modulated signal, then by third adder 2-9 and modulation believe Number feedforward amount v1Addition obtains the first switch mosfet pipe S1Modulated signal vBuck；The feedforward amount of another way and modulated signal v2Pass through the feedforward amount v of fifth adder 2-11 and modulated signal2Addition obtains the second switch mosfet pipe S2Modulated signal vBoost；The output signal v ' of current regulator 2-6cWith given offset signal ubiasIt is added, is obtained by second adder 2-8 To third switch mosfet pipe S '1Preliminary modulated signal, then pass through the feedforward amount v of the 4th adder 2-10 and modulated signal1Phase Add to obtain third switch mosfet pipe S '1Modulated signal v 'Buck；Given offset signal ubiasWith first adder 2-7, Second adder 2-8 together constitutes mode switch module, the control method cutting between Buck and Boost mode automatically Change is partially completed by this；
7) modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 2-12, obtains the first MOSFET and open Close pipe S1Switching signal, switching signal is directly sent to S1Drive module 2-16, by S1It is obtained after the amplification of drive module 2-16 Switching drive signal be fed directly to the first switch mosfet pipe S1Grid, open and turn off for controlling it；
8) modulated signal v 'BuckAfter compared with high frequency triangle wave is by the second comparator 2-13, the 3rd MOSFET is obtained Switching tube S '1Switching signal, be sent into the high frequency triangle wave of the second comparator 2-13 and be sent into first comparator 2-12 and third The high frequency triangle wave of comparator 2-14 phase difference of pi in phase, namely half of switch periods of difference；Obtained switching signal is directly sent To S '1Drive module 2-17, by S '1Switching drive signal, which is obtained, after the amplification of drive module 2-17 is fed directly to third Switch mosfet pipe S '1Grid, open and turn off for controlling it；
6) modulated signal vBoostAfter compared with high frequency triangle wave is by third comparator 2-14, obtains the 2nd MOSFET and open Close pipe S2Switching signal, be sent into third comparator 2-14 high frequency triangle wave and be sent into first comparator 2-12 high frequency triangle Wave is identical；Obtained switching signal is directly sent to S2Drive module 2-19, by S2It is obtained after the amplification of drive module 12-9 Switching drive signal be fed directly to third switch mosfet pipe S2Grid, control it and turn on and off.

Claims (5)

1. a kind of feed-forward type average current control suitable for two-tube One Buck-Boost converter body based on wide input direct-current converter System processed, the main circuit structure of the two-tube One Buck-Boost converter body are as follows: anode and the first switch mosfet of input power Pipe S1Drain electrode be connected；First switch mosfet pipe S1Source electrode respectively with the first silicon carbide diode D1Cathode and inductance first L Input side be connected；First silicon carbide diode D1Anode be directly connected with the cathode of input power；The outlet side of inductance first L Then with the second switch mosfet pipe S2Drain electrode and the second silicon carbide diode D2Anode be connected；Second switch mosfet pipe S2 Source electrode and the cathode of input power be connected directly；Second silicon carbide diode D2Cathode and export lateral capacitance C positive phase Even；The cathode of output lateral capacitance C is directly connected with the cathode of input power；The anode for exporting lateral capacitance C is just defeated as converter Anode out, the cathode that cathode, that is, input power cathode of capacitor C is exported as converter；It is characterized in that, described be applicable in After the processing that input voltage is passed through feed-forward module by the feed-forward type Average Current Control system of two-tube One Buck-Boost converter body, The current inner loop of Average Current Control is added to, input voltage is quickly inhibited to disturb the influence to output voltage, specifically: first Subtracter 1-1, voltage regulator 1-2, the second subtracter 1-3, current regulator 1-4 are sequentially connected, and current regulator 1-4's is defeated Outlet is connect with the input terminal of the input terminal of first adder 1-5, third adder 1-7 respectively, first adder 1-5, second Adder 1-6, first comparator 1-8 and S1Drive module 1-10 is sequentially connected, third adder 1-7, the second comparator 1-9, And S2Drive module 1-11 is sequentially connected, and the output end of the first input voltage feed forward function module 1-12 is connected to second adder The output end of the input terminal of 1-6, the second input voltage feed forward function module 1-13 is connected to the input terminal of third adder 1-7； The input translator output voltage signal v in the first subtracter 1-1oWith given outlet side voltage value vref, in the second subtracter The current signal i that input obtains from the inductance of converter in 1-3L, given offset letter is inputted in first adder 1-5 Number ubias, the feedforward amount v of the modulated signal of Buck switch is inputted in second adder 1-61, inputted in third adder 1-7 The feedforward amount v of the modulated signal of Boost switch2；From S1Drive module 1-10 output driving S1The switch of HF switch drives letter Number, from S2Drive module 1-11 output driving S2The switching drive signal of HF switch；The first of two-tube One Buck-Boost converter body Switch mosfet pipe S1Grid and S1Drive module 1-10 is connected, the second switch mosfet of two-tube One Buck-Boost converter body Pipe S2Grid and S2Drive module 1-11 is connected.
2. the feed-forward type Average Current Control system according to claim 1 suitable for two-tube One Buck-Boost converter body, It is characterized in that, the voltage regulator 1-2, current regulator 1-4 are proportional, integral (PI) adjuster.
3. a kind of feed-forward type suitable for the two-tube One Buck-Boost converter body of crisscross parallel type based on wide input direct-current converter Average Current Control system, the main circuit topological structure of the two-tube One Buck-Boost converter body of crisscross parallel type are as follows: input electricity Anode and the first switch mosfet pipe S in source1Drain electrode be connected；First switch mosfet pipe S1Source electrode respectively with first carbonization Silicon diode D1Cathode be connected with the input side of inductance first L；First silicon carbide diode D1Anode directly with input power Cathode is connected；Anode and the third switch mosfet pipe S ' of input power1Drain electrode be connected；Third switch mosfet pipe S '1Source Pole respectively with third silicon carbide diode D'1Cathode be connected with the input side of inductance second L '；Third silicon carbide diode D'1's Anode is directly connected with the cathode of input power；The outlet side of inductance first L and inductance second L ' respectively with the second switch mosfet pipe S2Drain electrode and the second silicon carbide diode D2Anode be connected；Second switch mosfet pipe S2Source electrode and input power it is negative Pole is connected directly；Second silicon carbide diode D2Cathode with output lateral capacitance C anode be connected；Export the cathode of lateral capacitance C Directly it is connected with the cathode of input power；Export the anode that the anode of lateral capacitance C is just exported as converter, the cathode of capacitor C That is the cathode that is exported as converter of the cathode of input power；It is characterized in that, described be suitable for the two-tube Buck- of crisscross parallel type The feed-forward type Average Current Control system of Boost is by input voltage by having added to average electricity after the processing of feed-forward module The current inner loop of flow control quickly inhibits input voltage to disturb the influence to output voltage, specifically: the first subtracter 2-1 Interconnected with voltage regulator 2-2, the second subtracter 2-3 and current regulator 2-5 are interconnected, third subtracter 2-4 and Current regulator 2-6 is interconnected；The input terminal of second subtracter 2-3 and third subtracter 2-4 are defeated with voltage regulator 2-2's Outlet is connected；The output end of current regulator 2-5 respectively with the input terminal of first adder 2-7, fifth adder 2-11 it is defeated Enter end connection, the output end of current regulator 2-6 is connected with the input terminal of second adder 2-8；First adder 2-7, third Adder 2-9, first comparator 2-12 and S1Drive module 2-16 is sequentially connected, second adder 2-8, the 4th adder 2- 10, the second comparator 2-13 and S '1Drive module 2-17 is sequentially connected, fifth adder 2-11, third comparator 2-14, S2It drives Dynamic model block 2-19 is sequentially connected；The output end of first input voltage feed forward function module 2-15 be connected to third adder 2-9 and The output end of the input terminal of 4th adder 2-10, the second input voltage feed forward function module 2-18 is connected to fifth adder 2- 11 input terminal；Input translator output voltage signal and given outlet side voltage value in the first subtracter 2-1, second The current signal that input obtains from the inductance first L of converter in subtracter 2-3 inputs in third subtracter 2-4 from transformation The current signal that the inductance place second L ' of device obtains, inputs given offset in first adder 2-7 and second adder 2-8 Output signal respectively corresponds input third adder 2-9 and the 4th and adds in signal, first adder 2-7 and second adder 2-8 In musical instruments used in a Buddhist or Taoist mass 2-10, the feed-forward signal v of Buck switch is also inputted in third adder 2-9 and the 4th adder 2-101, the 5th The feed-forward signal v of Boost switch is inputted in adder 2-112, in feedforward function module 2-15 and feedforward function module 2-18 Input translator input voltage signal；The output signal of first comparator 2-12 passes through S1Drive module 2-16 output driving is interlocked First switch mosfet pipe S of parallel duplex tube One Buck-Boost converter body1Switching drive signal, the second comparator 2-13's Output signal passes through S '13rd MOSFET of the two-tube One Buck-Boost converter body of drive module 2-17 output driving crisscross parallel type Switching tube S '1Switching drive signal, the output signal of third comparator 2-14 passes through S2Drive module 2-19 output driving is interlocked Second switch mosfet pipe S of parallel duplex tube One Buck-Boost converter body2Switching drive signal；The voltage regulator 2- 2, current regulator 2-5, current regulator 2-6 are proportional-integral controller.
4. based on the feed-forward type Average Current Control system described in claim 1 suitable for two-tube Buck-Boos converter Control method, which is characterized in that specific steps are as follows:
1) converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefSubtract by first Musical instruments used in a Buddhist or Taoist mass 1-1 makes the difference to form error signal vw, it is sent into voltage regulator 1-2, obtains the output signal v of voltage regulatori；First subtracts Musical instruments used in a Buddhist or Taoist mass 1-1 and voltage regulator 1-2 constitutes outer voltage；
2) the current signal i obtained from the inductance of converterL, output signal v with voltage regulator 1-2iPass through the second subtraction Device 1-3 makes the difference to form error signal iw, it is sent into current regulator 1-4, obtains the output signal v of current regulatorc；Second subtraction Device 1-3 and current regulator 1-4 collectively form current inner loop；
3) the input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward function module 1- 12 and second input voltage feed forward function module 1-13 processing, respectively obtain Buck switch modulated signal feedforward amount v1With The feedforward amount v of the modulated signal of Boost switch2, the two signals are sent to second adder 1-6 and third adder 1-7 respectively； First input voltage feed forward function module 1-12 and the second input voltage feed forward function module 1-13 and second adder 1-6 and Third adder 1-7 collectively forms input voltage feed forward module；
4) the output signal v of current regulator 1-4cPoint two-way, all the way with given offset signal ubiasPass through first adder 1-5 is added, and obtains the preliminary modulated signal of Buck switch, in the feedforward amount v for passing through second adder 1-6 and modulated signal1Phase Add to obtain the modulated signal v of Buck switchBuck；The feedforward amount v of another way and modulated signal2It is added by third adder 1-7 The modulated signal v switched to BoostBoost；Given offset signal ubiasPattern switching mould is constituted with first adder 1-5 Block, automatic switchover of the control method between Buck and Boost mode is partially completed by this；
5) modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 1-8, control switch S is obtained1Switch letter Number, switching signal is directly sent to S1Drive module 1-10, by S1The switching drive signal obtained after the amplification of drive module 1-10 It is fed directly to the first switch mosfet pipe S1Grid, open and turn off for controlling it；
6) modulated signal vBoostAfter compared with high frequency triangle wave is by the second comparator 1-9, control switch S is obtained2Switch Signal, switching signal are directly sent to S2Drive module 1-11, by S2The switch driving letter obtained after the amplification of drive module 1-11 Number it is fed directly to the second switch mosfet pipe S2Grid, control it and turn on and off.
5. based on the feed-forward type average current as claimed in claim 3 suitable for the two-tube One Buck-Boost converter body of crisscross parallel type The control method of control system, which is characterized in that specific steps are as follows:
1) converter output voltage signal v is obtained from converter outlet sideo, with given outlet side voltage value vrefSubtract by first Musical instruments used in a Buddhist or Taoist mass 2-1 makes the difference to form error signal vw, it is sent into voltage regulator 2-2, obtains the output signal v of voltage regulatori；First subtracts Musical instruments used in a Buddhist or Taoist mass 2-1 and voltage regulator 2-2 constitutes outer voltage；
2) the current signal i obtained from the inductance first L of converterL, output signal v with voltage regulator 2-2iPass through second Subtracter 2-3 makes the difference to form error signal iw, it is sent into current regulator 2-5, obtains the output signal v of current regulatorc；Second Subtracter 2-3 and current regulator 2-5 collectively form current inner loop 2-1；
3) the current signal i ' obtained from the inductance second L ' of converterL, output signal v with voltage regulator 2-2iPass through Three subtracter 2-4, make the difference to form error signal i 'w, it is sent into current regulator 2-6, obtains the output signal v ' of current regulatorc； Third subtracter 2-4 and current regulator 2-6 collectively form current inner loop 2-2；
4) the input voltage signal v obtained from converter input sideg, divide two-way by the first input voltage feed forward function module 2- 15 and second input voltage feed forward function module 2-18 processing, respectively obtain the first switch mosfet pipe S1It is opened with the 3rd MOSFET Close pipe S '1Modulated signal feedforward amount v1With the second switch mosfet pipe S2Modulated signal feedforward amount v2, the two signals It is sent to third adder 2-9, the 4th adder 2-10 and fifth adder 2-11 respectively；First input voltage feed forward function module 2-15 and the second input voltage feed forward function module 2-18 and third adder 2-9, the 4th adder 2-10 and fifth adding Device 2-11 collectively forms input voltage feed forward module；
5) the output signal v of voltage regulator 2-2iDivide two-way, is connected all the way with the input side of the second subtracter 2-3, another way is then It is connected with the input side of third subtracter 2-4；
6) the output signal v of current regulator 2-5cPoint two-way, all the way with given offset signal ubiasPass through first adder 2-7 is added, and obtains the first switch mosfet pipe S1Preliminary modulated signal, then pass through third adder 2-9 and modulated signal Feedforward amount v1Addition obtains the first switch mosfet pipe S1Modulated signal vBuck；The feedforward amount v of another way and modulated signal2It is logical Cross the feedforward amount v of fifth adder 2-11 and modulated signal2Addition obtains the second switch mosfet pipe S2Modulated signal vBoost； The output signal v ' of current regulator 2-6cWith given offset signal ubiasIt is added by second adder 2-8, obtains third Switch mosfet pipe S '1Preliminary modulated signal, then pass through the feedforward amount v of the 4th adder 2-10 and modulated signal1Addition obtains Third switch mosfet pipe S '1Modulated signal v 'Buck；Given offset signal ubiasAdd with first adder 2-7, second Musical instruments used in a Buddhist or Taoist mass 2-8 together constitutes mode switch module, automatic switchover of the control method between Buck and Boost mode be by What this was partially completed；
7) modulated signal vBuckAfter compared with high frequency triangle wave is by first comparator 2-12, the first switch mosfet pipe is obtained S1Switching signal, switching signal is directly sent to S1Drive module 2-16, by S1What is obtained after the amplification of drive module 2-16 opens It closes driving signal and is fed directly to the first switch mosfet pipe S1Grid, open and turn off for controlling it；
8) modulated signal v 'BuckAfter compared with high frequency triangle wave is by the second comparator 2-13, third switch mosfet pipe is obtained S′1Switching signal, be sent into the high frequency triangle wave of the second comparator 2-13 and be sent into first comparator 2-12 and third comparator The high frequency triangle wave of 2-14 phase difference of pi in phase, namely half of switch periods of difference；Obtained switching signal is directly sent to S '1 Drive module 2-17, by S '1It obtains switching drive signal after the amplification of drive module 2-17 and is fed directly to the 3rd MOSFET opening Close pipe S '1Grid, open and turn off for controlling it；
9) modulated signal vBoostAfter compared with high frequency triangle wave is by third comparator 2-14, the second switch mosfet pipe is obtained S2Switching signal, be sent into third comparator 2-14 high frequency triangle wave with feeding first comparator 2-12 high frequency triangle wave it is complete It is exactly the same；Obtained switching signal is directly sent to S2Drive module 2-19, by S2What is obtained after the amplification of drive module 2-19 opens It closes driving signal and is fed directly to the second switch mosfet pipe S2Grid, control it and turn on and off.
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