CN115133789B - Bipolar voltage pulse power supply topological structure and control method - Google Patents

Bipolar voltage pulse power supply topological structure and control method Download PDF

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Publication number
CN115133789B
CN115133789B CN202210809349.4A CN202210809349A CN115133789B CN 115133789 B CN115133789 B CN 115133789B CN 202210809349 A CN202210809349 A CN 202210809349A CN 115133789 B CN115133789 B CN 115133789B
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output end
voltage
commutation
unit
switching
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CN115133789A (en
Inventor
郑启发
赵振兴
戴瑜兴
贺超
彭子舜
刘志红
宁勇
朱积嘉
孙静
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Hunan Zhongyuan Technology Co ltd
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Hunan Zhongyuan Technology Co ltd
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Classifications

    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a bipolar voltage pulse power supply topological structure and a control method, wherein the bipolar voltage pulse power supply topological structure comprises the following components: the voltage input unit is provided with a first voltage output end and a second voltage output end and is used for converting alternating current into direct current; the staggered frequency multiplication buck conversion unit is provided with a first buck output end, a second buck output end, a first voltage conversion end connected with the first voltage output end and a second voltage conversion end connected with the second voltage output end; the switch unit is connected in parallel between the first voltage reduction output end and the second voltage reduction output end; the commutation unit is provided with a first commutation input end connected with the first voltage reduction output end, a second commutation input end connected with the second voltage reduction output end, a first commutation output end and a second commutation output end, wherein the first commutation output end and the second commutation output end are used for outputting voltage. The bipolar voltage pulse power supply topological structure provided by the embodiment of the invention can reduce the switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.

Description

Bipolar voltage pulse power supply topological structure and control method
Technical Field
The invention relates to the technical field related to power electronics, in particular to a bipolar voltage pulse power supply topological structure and a control method.
Background
The bipolar voltage pulse power supply is a latest generation electroplating power supply product, also called a flat wave/bidirectional pulse wave adjustable switch power supply, and is characterized in that a power frequency alternating current is rectified into a direct current high-voltage power supply, a low-voltage large-current power supply is generated through high-frequency voltage conversion and high-frequency rectification, and then the low-voltage large-current power supply is filtered into a pure direct current power supply through an inductance resistor, and the pure direct current power supply is sent to an asymmetric full-bridge conversion circuit (also called a chopper circuit) to generate an artificial flat wave (namely pure direct current) or bidirectional pulse square wave output.
The bipolar voltage pulse power supply is widely applied to the fields of vacuum coating, semiconductor industry, plasma injection and the like. The traditional bipolar voltage pulse power supply has the problems of high switching loss and low overall efficiency of the power supply.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a bipolar voltage pulse power supply topological structure, which can reduce switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.
The invention also provides a control method of the bipolar voltage pulse power supply topological structure and a computer readable storage medium.
A bipolar voltage pulse power supply topology according to an embodiment of the first aspect of the present invention comprises:
the voltage input unit is provided with a first voltage input end, a second voltage input end, a first voltage output end and a second voltage output end and is used for converting alternating current into direct current;
the staggered frequency multiplication buck conversion unit is provided with a first buck output end, a second buck output end, a first voltage conversion end connected with the first voltage output end and a second voltage conversion end connected with the second voltage output end;
the switch unit is connected in parallel between the first voltage reduction output end and the second voltage reduction output end;
the commutation unit is provided with a first commutation input end, a second commutation input end, a first commutation output end and a second commutation output end, wherein the first commutation input end is connected with the first voltage reduction output end, the second commutation input end is connected with the second voltage reduction output end, and the first commutation output end and the second commutation output end are commonly used for outputting voltage.
The bipolar voltage pulse power supply topological structure provided by the embodiment of the invention has at least the following beneficial effects:
the alternating voltage forms stable direct current bus voltage after passing through the voltage input unit, the staggered frequency multiplication and voltage reduction type conversion unit is controlled by adopting pulse control signals with the same frequency and duty ratio but different phases, the frequency multiplication working frequency of the staggered frequency multiplication and voltage reduction type conversion unit can be realized, and only the low-frequency signal is needed to control each switching tube in the staggered frequency multiplication and voltage reduction type conversion unit, so that the switching loss can be reduced, and the overall efficiency is improved. Through the frequency multiplication mode, the volume of the inductor in the staggered frequency multiplication buck conversion unit can be reduced, and the power density is improved. By switching on the switching unit before commutation of the commutation unit and switching off the switching unit after the commutation is finished, zero-voltage switching of the commutation unit can be realized, and switching loss is reduced. The bipolar voltage pulse power supply topological structure provided by the embodiment of the invention can reduce the switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.
According to some embodiments of the invention, the interleaved frequency doubling buck conversion unit comprises:
the first switching tubes are sequentially connected in parallel to form a parallel structure, the parallel structure is provided with a first output end and a second output end, and the second output end is connected with the second voltage output end;
the second switching tube is connected in parallel between the first output end and the second output end;
the positive electrode of the first follow current diode is connected with the first output end, and the negative electrode of the first follow current diode is respectively connected with the first voltage output end and the first commutation input end;
the positive electrode of the discharge diode is connected with the second output end;
a discharge capacitor connected between the cathode of the first freewheeling diode and the cathode of the discharge diode;
one end of the filter inductor is connected with the first output end, and the other end of the filter inductor is connected with the second commutation input end;
and the anode of the second follow current diode is connected with the discharge capacitor, and the cathode of the second follow current diode is connected with the filter inductor.
According to some embodiments of the invention, the voltage input unit comprises:
the transformer is provided with a first alternating current input end, a second alternating current input end, a first alternating current output end and a second alternating current output end, wherein the first alternating current input end and the second alternating current input end are commonly used for inputting alternating current;
the full-bridge rectifier bridge is provided with a first rectification output end, a second rectification output end, a first rectification input end connected with the first alternating current output end and a second rectification input end connected with the second alternating current output end, and is used for converting alternating current into direct current;
the filter capacitor is connected in parallel between the first rectification output end and the second rectification output end;
and the bleeder resistor is connected with the filter capacitor in parallel.
According to some embodiments of the invention, the voltage input unit further comprises:
one end of the first capacitor is connected with the first alternating current output end;
and one end of the first resistor is connected with the other end of the first capacitor, and the other end of the first resistor is connected with the second alternating current output end.
According to some embodiments of the invention, the capacitance of the filter capacitor is greater than the capacitance of the discharge capacitor.
According to some embodiments of the invention, the commutation cell comprises:
the collector of the first phase-change switch tube is connected with the first voltage-reduction output end;
the collector of the second phase change switching tube is connected with the collector of the first phase change switching tube;
the collector of the third phase-change switching tube is connected with the emitter of the first phase-change switching tube, and the emitter is connected with the second voltage-reducing output end;
the collector of the fourth commutation switching tube is connected with the emitter of the second commutation switching tube, and the emitter is connected with the emitter of the third commutation switching tube; the intermediate nodes of the first and second commutation switching tubes and the intermediate nodes of the second and fourth commutation switching tubes are commonly used for outputting voltage.
According to some embodiments of the invention, the switching unit employs a switching tube.
According to the control method of the bipolar voltage pulse power supply topological structure, the bipolar voltage pulse power supply topological structure comprises a voltage input unit, an interleaved frequency multiplication buck conversion unit, a switching unit and a phase conversion unit which are sequentially connected in parallel, the interleaved frequency multiplication buck conversion unit comprises a filter inductor and a plurality of first switching tubes, the first switching tubes are sequentially connected in parallel to form a parallel structure, the parallel structure is connected with the voltage input unit in parallel, one end of the parallel structure is connected with one end of the switching unit, one end of the filter inductor is connected with one end of the parallel structure, and the other end of the filter inductor is connected with the other end of the switching unit;
the control method comprises the following steps:
a plurality of pulse control signals are correspondingly sent to the first switching tubes one by one, so that the filter inductor works at a plurality of working frequencies, and the frequency and the duty ratio of the pulse control signals are the same but the phases are different;
after the filter inductor works at multiple working frequencies, the switch unit is conducted, and a phase-change control signal is sent to the phase-change unit so that the phase-change unit performs phase change;
and closing the switching unit after the commutation is completed, so that the commutation unit outputs a voltage.
The control method according to the embodiment of the invention has at least the following beneficial effects:
the alternating voltage forms stable direct current bus voltage after passing through the voltage input unit, and a plurality of pulse control signals with the same duty ratio and different phases are sent to a plurality of first switching tube frequencies in a one-to-one correspondence mode, so that the multiple frequency operation frequency of the filter inductor can be realized, and only the low-frequency signals are needed to control each first switching tube, so that the switching loss can be reduced, and the overall efficiency is improved. Through the frequency multiplication mode, the volume of the filter inductor can be reduced, and the power density is improved. By switching on the switching unit before commutation of the commutation unit and switching off the switching unit after the commutation is finished, zero-voltage switching of the commutation unit can be realized, and switching loss is reduced. The control method of the embodiment of the invention can reduce the switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.
According to some embodiments of the invention, the interleaved frequency doubling buck conversion unit further comprises a second switching tube connected in parallel with the parallel structure; the step of sending a plurality of pulse control signals to a plurality of first switching tubes in a one-to-one correspondence manner so that the filter inductor works at a plurality of working frequencies comprises the following steps:
the second switching tube is conducted, and a plurality of pulse control signals are correspondingly sent to the first switching tubes one by one;
and closing the second switching tube after the filter inductor works at a plurality of times of working frequency.
A computer-readable storage medium according to an embodiment of the third aspect of the present invention stores computer-executable instructions for performing the control method according to the embodiment of the second aspect described above. Since the computer-readable storage medium adopts all the technical solutions of the control method of the above embodiments, it has at least all the advantageous effects brought by the technical solutions of the above embodiments.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is an electrical schematic diagram of a bipolar voltage pulse power supply topology according to one embodiment of the present invention;
FIG. 2 is a flow chart of a control method of a bipolar voltage pulse power topology according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a bipolar voltage pulse power supply topology according to an embodiment of the present invention;
fig. 4 is a waveform diagram of a bipolar voltage pulse power supply topology according to another embodiment of the present invention.
Reference numerals:
a voltage input unit 100, a full-bridge rectifier bridge 110;
an interleaved frequency-doubled buck conversion unit 200;
a switching unit 300;
commutation cell 400.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.
The bipolar voltage pulse power supply topology of the embodiments of the present invention will be clearly and fully described below in conjunction with fig. 1-4, it being apparent that the embodiments described below are some, but not all, embodiments of the present invention.
The bipolar voltage pulse power supply topology according to the embodiment of the first aspect of the present invention includes a voltage input unit 100, an interleaved frequency-doubling buck conversion unit 200, a switching unit 300, and a commutation unit 400. The voltage input unit 100 has a first voltage input terminal, a second voltage input terminal, a first voltage output terminal, and a second voltage output terminal, and the voltage input unit 100 is configured to convert ac power into dc power; the interleaved frequency multiplication buck conversion unit 200 is provided with a first buck output end, a second buck output end, a first voltage conversion end connected with the first voltage output end and a second voltage conversion end connected with the second voltage output end; the switch unit 300 is connected in parallel between the first voltage-reducing output end and the second voltage-reducing output end; the commutation unit 400 has a first commutation input end, a second commutation input end, a first commutation output end, and a second commutation output end, where the first commutation input end is connected with the first step-down output end, the second commutation input end is connected with the second step-down output end, and the first commutation output end and the second commutation output end are used together to output voltage.
The alternating current passes through the voltage input unit 100 to form a stable direct current bus voltage, and the stable direct current bus voltage is output to the interleaved frequency multiplication buck conversion unit 200 for voltage conversion. The first switching tubes in the interleaved frequency-doubling buck conversion unit 200 are controlled by pulse control signals with the same frequency and duty ratio but different phases, so that the filter inductor L in the interleaved frequency-doubling buck conversion unit 200 works at the frequency of frequency multiplication, and only the low-frequency signals are needed to control the first switching tubes, thereby reducing switching loss and improving the overall efficiency. After the filter inductor L works at the multiple frequency operation frequency, the switching unit 300 is turned on, and then a commutation control signal is sent to the commutation unit 400, so that the commutation unit 400 commutates. Since the switching unit 300 is turned on and the commutation unit 400 is connected in parallel with the switching unit 300, the output voltage of the commutation unit 400 is zero, thereby realizing zero-voltage switching in the commutation process and reducing switching loss. Since the output voltage of the commutation cell 400 is maintained at zero during the commutation process, the commutation control signal of the commutation cell 400 does not need to be inserted into dead time, thereby accelerating the commutation speed. After the commutation is completed, the switching unit 300 may be turned off so that the commutation unit 400 normally outputs a voltage.
Fig. 2 is a waveform diagram of a bipolar voltage pulse power supply topology when the switching unit 300 adopts a short pulse triggering control mode and the number of the first switching transistors is 2, S in fig. 2 1 And S is 2 All of which represent the first switching tube, a is the waveform of the pulse trigger signal for controlling the on state of the switching unit 300. As can be seen from fig. 2, the output voltage of the switching unit 300 is directly commutated after zero crossing.
Fig. 3 is a waveform diagram of a bipolar voltage pulse power supply topology structure when the switching unit 300 adopts a long pulse triggering control mode and the number of the first switching tubes is 2, and as can be seen from fig. 3, the output voltage of the switching unit 300 keeps a zero-output state after zero crossing until the switching unit 300 is turned off for phase change.
It should be noted that, the switching unit 300 may be implemented by either a short pulse triggering control method or a long pulse triggering control method, and the zero-voltage switching of the commutation unit 400 may be implemented, and the triggering method of the switching unit 300 should not be construed as limiting the present invention. In addition, the number of first switching tubes should not be construed as limiting the invention.
According to the bipolar voltage pulse power supply topological structure, the alternating voltage forms stable direct current bus voltage after passing through the voltage input unit 100, the staggered frequency multiplication buck conversion unit 200 is controlled by adopting pulse control signals with the same frequency and duty ratio but different phases, the frequency multiplication working frequency of the staggered frequency multiplication buck conversion unit 200 can be realized, and only the low-frequency signals are needed to control all switching tubes in the staggered frequency multiplication buck conversion unit 200, so that the switching loss can be reduced, and the overall efficiency is improved. By frequency multiplication, the volume of the inductor in the interleaved frequency-multiplied buck converter 200 can be reduced, and the power density can be increased. By turning on the switching unit 300 before commutation of the commutation unit 400 and turning off the switching unit 300 after the commutation is completed, zero voltage switching of the commutation unit 400 can be achieved, and switching losses are reduced. The bipolar voltage pulse power supply topological structure provided by the embodiment of the invention can reduce the switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.
In some embodiments of the present invention, referring to fig. 1, the interleaved frequency-doubling buck conversion unit 200 includes a second switching tube Q0, a first freewheeling diode D1, a discharging diode D2, a discharging capacitor C1, a filter inductance L, a second freewheeling diode D3, and a plurality of first switching tubes. The first switching tubes are sequentially connected in parallel to form a parallel structure, the parallel structure is provided with a first output end and a second output end, and the second output end is connected with the second voltage output end; the second switching tube Q0 is connected in parallel between the first output end and the second output end; the positive electrode of the first follow current diode D1 is connected with the first output end, and the negative electrode of the first follow current diode D1 is respectively connected with the first voltage output end and the first commutation input end; a discharge diode D2, the anode of which is connected with the second output end; a discharge capacitor C1 connected between the cathode of the first freewheeling diode D1 and the cathode of the discharge diode D2; one end of the filter inductor L is connected with the first output end, and the other end of the filter inductor L is connected with the second commutation input end; and the anode of the second freewheeling diode D3 is connected with the discharging capacitor C1, and the cathode of the second freewheeling diode D is connected with the filtering inductor L.
If the number of the first switching tubes is n, the n first switching tubes are controlled by pulse control signals with the same frequency f and duty ratio but different phases, and the working frequency of the filter inductor L is n x f. When any one of the first switching tubes is turned on, the other (n-1) first switching tubes are turned off, the second switching tube Q0 is turned on before any one of the n first switching tubes is turned off until the second switching tube Q0 is turned off after the first switching tube is turned off, zero voltage turn-off of the n first switching tubes is realized, and switching loss is reduced. After the interleaved frequency-doubling buck conversion unit 200 enters the freewheel state, the filter inductor L freewheels through the first freewheel diode D1, the discharge capacitor C1 and the second freewheel diode D3. The discharge diode D2 and the discharge capacitor C1 are used to eliminate a voltage spike generated by superimposing the voltage of the filter capacitor C2 on the back electromotive force of the filter inductance L when the switching unit 300 is turned off. By adopting the frequency multiplication mode, only the low-frequency pulse control signals are needed to control each switch tube, so that the switching loss can be reduced, the overall efficiency is improved, and the size of the filter inductor L can be reduced and the power density can be improved by adopting the frequency multiplication mode. It should be noted that the working principle of the interleaved frequency-doubling buck conversion unit 200 is known to those skilled in the art, and thus will not be described in detail.
In some embodiments of the present invention, referring to fig. 1, the voltage input unit 100 includes a transformer T, a full bridge rectifier bridge 110, a filter capacitor C2, and bleeder resistors R1, R2. The transformer T is provided with a first alternating current input end, a second alternating current input end, a first alternating current output end and a second alternating current output end, wherein the first alternating current input end and the second alternating current input end are commonly used for inputting alternating current; the full-bridge rectifier bridge 110 is provided with a first rectification output end, a second rectification output end, a first rectification input end connected with the first alternating current output end and a second rectification input end connected with the second alternating current output end, and the full-bridge rectifier bridge 110 is used for converting alternating current into direct current; the filter capacitor C2 is connected in parallel between the first rectification output end and the second rectification output end; the bleeder resistors R1, R2 are connected in parallel with the filter capacitor C2. The ac power passes through the transformer T, the full-bridge rectifier 110 and the filter capacitor C2 to form a stable dc bus voltage, and the specific working principle thereof will not be described herein.
In some embodiments of the present invention, referring to fig. 1, the voltage input unit 100 further includes a first capacitor C3 and a first resistor R3. One end of the first capacitor C3 is connected with the first alternating current output end; and one end of the first resistor R3 is connected with the other end of the first capacitor C3, and the other end of the first resistor R is connected with the second alternating current output end. The arrangement of the first capacitor C3 and the first resistor R3 can filter out higher harmonics, and the specific principle is the prior art known to those skilled in the art, and will not be described herein.
In some embodiments of the present invention, the capacitance of the filter capacitor C2 is greater than the capacitance of the discharge capacitor C1. When the switching unit 300 is turned off, the electromotive force of the filter inductance L is reversed, and the reversed electromotive force superimposes the voltage of the filter capacitance C2 to form a voltage surge peak, and the discharge capacitance C1 discharges to the filter capacitance C2 through the discharge diode D2 to eliminate the voltage surge peak. The capacitance of the filter capacitor C2 needs to be larger than that of the discharge capacitor C1 to ensure the stability of the bus voltage during the formation and elimination of the voltage spike.
In some embodiments of the present invention, referring to fig. 1, a commutation cell 400 includes a first commutation switching tube Q1, a second commutation switching tube Q2, a third commutation switching tube Q3, and a fourth commutation switching tube Q4. The collector of the first phase-change switching tube Q1 is connected with the first voltage-reducing output end; a collector of the second commutation switching tube Q2 is connected to a collector of the first commutation switching tube Q1; the collector of the third commutation switching tube Q3 is connected with the emitter of the first commutation switching tube Q1, and the emitter is connected with the second voltage-reducing output end; a fourth commutation switching tube Q4, the collector of which is connected with the emitter of the second commutation switching tube Q2, and the emitter of which is connected with the emitter of the third commutation switching tube Q3; the intermediate nodes of the first and second commutation switching tubes Q1 and Q2 and the intermediate nodes of the second and fourth commutation switching tubes Q2 and Q4 are commonly used for output voltages. The commutation process of the commutation unit 400 is known to those skilled in the art, and will not be described in detail herein.
In some embodiments of the present invention, referring to fig. 1, the switching unit 300 employs a switching tube. The switching tube can be an MOS tube made of SiC material, and the MOS tube made of SiC material has the advantages of high voltage resistance, low loss, high efficiency and the like. The MOS tube made of SiC material is not only suitable for a wide voltage range from 600V to 10kV, but also has excellent switching performance of a unipolar device. Compared with a silicon IGBT, the MOS tube made of the SiC material has lower switching loss and higher working frequency under the condition that current tailing does not exist in a switching circuit. The zero-voltage switching of the commutation cell 400 is realized in a bipolar voltage pulse power topology suitable for application to embodiments of the present invention. It should be noted that the specific type and model of the switching tube should not be construed as limiting the present invention, so long as the zero-voltage switching of the commutation cell 400 can be achieved.
The following will describe the control method of the bipolar voltage pulse power supply topology according to the embodiments of the present invention in detail with reference to fig. 1 to 4, and it is obvious that the embodiments described below are some, but not all embodiments of the present invention.
According to the control method of the bipolar voltage pulse power supply topology structure of the second aspect embodiment of the present invention, the bipolar voltage pulse power supply topology structure comprises a voltage input unit 100, an interleaved frequency doubling buck conversion unit 200, a switching unit 300 and a commutation unit 400 which are sequentially connected in parallel, the interleaved frequency doubling buck conversion unit 200 comprises a filter inductor L and a plurality of first switching tubes, the first switching tubes are sequentially connected in parallel to form a parallel structure, the parallel structure is connected in parallel with the voltage input unit 100, one end of the parallel structure is connected with one end of the switching unit 300, one end of the filter inductor L is connected with one end of the parallel structure, and the other end of the filter inductor L is connected with the other end of the switching unit 300;
the control method comprises the following steps:
a plurality of pulse control signals are correspondingly sent to the first switching tubes one by one, so that the filter inductor L works at a plurality of times of working frequency, and the frequency and the duty ratio of the pulse control signals are the same but the phases are different;
switching on the switching unit 300 after the filter inductor L operates at a multiple of the operating frequency, and transmitting a commutation control signal to the commutation unit 400, so that the commutation unit 400 commutates;
the switching unit 300 is turned off after the commutation is completed, so that the commutation unit 400 outputs a voltage.
The alternating current forms stable direct current bus voltage after passing through the voltage input unit 100, and outputs the stable direct current bus voltage to the staggered frequency multiplication buck conversion unit 200 for voltage conversion, if the number of the first switching tubes is n, the n first switching tubes are controlled by pulse control signals with the same frequency f and duty ratio but different phases, and the working frequency of the filter inductor L is n x f. After the filter inductor L operates at the operating frequency of n×f, the switching unit 300 is turned on, and then a commutation control signal is sent to the commutation unit 400, so that the commutation unit 400 performs commutation. Since the switching unit 300 is turned on and the commutation unit 400 is connected in parallel with the switching unit 300, the output voltage of the commutation unit 400 is zero, thereby realizing zero-voltage switching in the commutation process and reducing switching loss. Since the output voltage of the commutation cell 400 is maintained at zero during the commutation process, the commutation control signal of the commutation cell 400 does not need to be inserted into dead time, thereby accelerating the commutation speed. After the commutation is completed, the switching unit 300 may be turned off so that the commutation unit 400 normally outputs a voltage.
Fig. 2 is a waveform diagram of a bipolar voltage pulse power supply topology when the switching unit 300 adopts a short pulse triggering control mode and the number of the first switching transistors is 2, S in fig. 2 1 And S is 2 All of which represent the first switching tube, a is the waveform of the pulse trigger signal for controlling the on state of the switching unit 300. As can be seen from fig. 2, the output voltage of the switching unit 300 is directly commutated after zero crossing.
Fig. 3 is a waveform diagram of a bipolar voltage pulse power supply topology structure when the switching unit 300 adopts a long pulse triggering control mode and the number of the first switching tubes is 2, and as can be seen from fig. 3, the output voltage of the switching unit 300 keeps a zero-output state after zero crossing until the switching unit 300 is turned off for phase change.
It should be noted that, the switching unit 300 may be implemented by either a short pulse triggering control method or a long pulse triggering control method, and the zero-voltage switching of the commutation unit 400 may be implemented, and the triggering method of the switching unit 300 should not be construed as limiting the present invention.
According to the control method of the embodiment of the invention, the alternating voltage forms stable direct current bus voltage after passing through the voltage input unit 100, and a plurality of pulse control signals with the same duty ratio and different phases are sent to a plurality of first switching tube frequencies in a one-to-one correspondence manner, so that the multiple frequency operation frequency of the filter inductor L can be realized, and only the low-frequency signals are needed to control each first switching tube, so that the switching loss can be reduced, and the overall efficiency is improved. Through the frequency multiplication mode, the volume of the filter inductor L can be reduced, and the power density is improved. By turning on the switching unit 300 before commutation of the commutation unit 400 and turning off the switching unit 300 after the commutation is completed, zero voltage switching of the commutation unit 400 can be achieved, and switching losses are reduced. The control method of the embodiment of the invention can reduce the switching loss, improve the efficiency of the whole machine and accelerate the phase change speed.
In some embodiments of the present invention, referring to fig. 1, the interleaved frequency doubling buck conversion unit 200 further includes a second switching tube Q0, and the second switching tube Q0 is connected in parallel with the parallel structure; a plurality of pulse control signals are correspondingly sent to a plurality of first switching tubes one by one, so that the filter inductor L works at a plurality of operating frequencies, and the method comprises the following steps:
turning on the second switching tube Q0, and transmitting a plurality of pulse control signals to the plurality of first switching tubes in a one-to-one correspondence manner;
the second switching tube Q0 is turned off after the filter inductance L operates at a multiple of the operating frequency.
If the number of the first switching tubes is n, when any one of the first switching tubes is turned on, the other (n-1) first switching tubes are turned off, the second switching tube Q0 is turned on before any one of the n first switching tubes is turned off until the second switching tube Q0 is turned off after the first switching tube is turned off, zero voltage turn-off of the n first switching tubes is realized, and switching loss is reduced.
In addition, an embodiment of the present invention also provides a control apparatus including: memory, a processor, and a computer program stored on the memory and executable on the processor. The processor and the memory may be connected by a bus or other means.
The memory, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory remotely located relative to the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The non-transitory software programs and instructions required to implement the control methods of the above embodiments are stored in a memory that, when executed by a processor, perform the control methods of the above embodiments.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Furthermore, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, so that the processor performs the control method of the above embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (9)

1. A bipolar voltage pulse power supply topology comprising:
the voltage input unit is provided with a first voltage input end, a second voltage input end, a first voltage output end and a second voltage output end and is used for converting alternating current into direct current;
the staggered frequency multiplication buck conversion unit is provided with a first buck output end, a second buck output end, a first voltage conversion end connected with the first voltage output end and a second voltage conversion end connected with the second voltage output end;
wherein, the crisscross frequency multiplication step-down conversion unit includes: the first switching tubes are sequentially connected in parallel to form a parallel structure, the parallel structure is provided with a first output end and a second output end, and the second output end is connected with the second voltage output end; the second switching tube is connected in parallel between the first output end and the second output end; the positive electrode of the first follow current diode is connected with the first output end, and the negative electrode of the first follow current diode is respectively connected with the first voltage output end and the first commutation input end; the positive electrode of the discharge diode is connected with the second output end; a discharge capacitor connected between the cathode of the first freewheeling diode and the cathode of the discharge diode; one end of the filter inductor is connected with the first output end, and the other end of the filter inductor is connected with the second commutation input end; the positive electrode of the second follow current diode is connected with the negative electrode of the discharge diode, and the negative electrode of the second follow current diode is connected with the other end of the filter inductor;
the switch unit is connected in parallel between the first voltage reduction output end and the second voltage reduction output end;
the commutation unit is provided with a first commutation input end, a second commutation input end, a first commutation output end and a second commutation output end, wherein the first commutation input end is connected with the first voltage reduction output end, the second commutation input end is connected with the second voltage reduction output end, and the first commutation output end and the second commutation output end are commonly used for outputting voltage.
2. The bipolar voltage pulse power supply topology of claim 1, wherein the voltage input unit comprises:
the transformer is provided with a first alternating current input end, a second alternating current input end, a first alternating current output end and a second alternating current output end, wherein the first alternating current input end and the second alternating current input end are commonly used for inputting alternating current;
the full-bridge rectifier bridge is provided with a first rectification output end, a second rectification output end, a first rectification input end connected with the first alternating current output end and a second rectification input end connected with the second alternating current output end, and is used for converting alternating current into direct current;
the filter capacitor is connected in parallel between the first rectification output end and the second rectification output end;
and the bleeder resistor is connected with the filter capacitor in parallel.
3. The bipolar voltage pulse power supply topology of claim 2, wherein said voltage input unit further comprises:
one end of the first capacitor is connected with the first alternating current output end;
and one end of the first resistor is connected with the other end of the first capacitor, and the other end of the first resistor is connected with the second alternating current output end.
4. The bipolar voltage pulse power supply topology of claim 2, wherein a capacitance of said filter capacitor is greater than a capacitance of said discharge capacitor.
5. The bipolar voltage pulse power supply topology of claim 1, wherein said commutation cell comprises:
the collector of the first phase-change switch tube is connected with the first voltage-reduction output end;
the collector of the second phase change switching tube is connected with the collector of the first phase change switching tube;
the collector of the third phase-change switching tube is connected with the emitter of the first phase-change switching tube, and the emitter is connected with the second voltage-reducing output end;
the collector of the fourth commutation switching tube is connected with the emitter of the second commutation switching tube, and the emitter is connected with the emitter of the third commutation switching tube; the intermediate nodes of the first and third commutation switching tubes and the intermediate nodes of the second and fourth commutation switching tubes are commonly used for outputting voltage.
6. The bipolar voltage pulse power supply topology of claim 1, wherein the switching unit employs a switching tube.
7. A control method of a bipolar voltage pulse power supply topology, characterized by being applied to the bipolar voltage pulse power supply topology as claimed in any one of claims 1 to 6; the control method comprises the following steps:
a plurality of pulse control signals are correspondingly sent to the first switching tubes one by one, so that the filter inductor works at a plurality of working frequencies, and the frequency and the duty ratio of the pulse control signals are the same but the phases are different;
after the filter inductor works at multiple working frequencies, the switch unit is conducted, and a phase-change control signal is sent to the phase-change unit so that the phase-change unit performs phase change;
and closing the switching unit after the commutation is completed, so that the commutation unit outputs a voltage.
8. The control method according to claim 7, wherein the step of transmitting a plurality of pulse control signals to a plurality of the first switching tubes in one-to-one correspondence to cause the filter inductance to operate at a plurality of operating frequencies includes the steps of:
the second switching tube is conducted, and a plurality of pulse control signals are correspondingly sent to the first switching tubes one by one;
and closing the second switching tube after the filter inductor works at a plurality of times of working frequency.
9. A computer-readable storage medium storing computer-executable instructions for performing the control method according to claim 7 or 8.
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Publication number Priority date Publication date Assignee Title
JPH11113253A (en) * 1997-10-06 1999-04-23 Hitachi Ltd Booster chopper circuit
CN105896982A (en) * 2016-05-12 2016-08-24 哈尔滨工业大学 BUCK frequency doubling circuit
CN106208745A (en) * 2016-08-08 2016-12-07 上海交通大学 CUT output current ripple frequency multiplication and modulating system
CN106505870A (en) * 2016-11-25 2017-03-15 广东百事泰电子商务股份有限公司 A kind of long-life intelligently voltage boosting conversion equipment
CN206422704U (en) * 2017-01-11 2017-08-18 广东百事泰电子商务股份有限公司 Intelligent half-bridge sine voltage change-over circuit based on PFC interleaving inverse excitations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11113253A (en) * 1997-10-06 1999-04-23 Hitachi Ltd Booster chopper circuit
CN105896982A (en) * 2016-05-12 2016-08-24 哈尔滨工业大学 BUCK frequency doubling circuit
CN106208745A (en) * 2016-08-08 2016-12-07 上海交通大学 CUT output current ripple frequency multiplication and modulating system
CN106505870A (en) * 2016-11-25 2017-03-15 广东百事泰电子商务股份有限公司 A kind of long-life intelligently voltage boosting conversion equipment
CN206422704U (en) * 2017-01-11 2017-08-18 广东百事泰电子商务股份有限公司 Intelligent half-bridge sine voltage change-over circuit based on PFC interleaving inverse excitations

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