WO2019080245A1 - Wide-range bidirectional soft switch dc conversion circuit and control method therefor - Google Patents

Wide-range bidirectional soft switch dc conversion circuit and control method therefor

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Publication number
WO2019080245A1
WO2019080245A1 PCT/CN2017/113027 CN2017113027W WO2019080245A1 WO 2019080245 A1 WO2019080245 A1 WO 2019080245A1 CN 2017113027 W CN2017113027 W CN 2017113027W WO 2019080245 A1 WO2019080245 A1 WO 2019080245A1
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WO
WIPO (PCT)
Prior art keywords
high frequency
circuit
bridge arm
sub
conversion
Prior art date
Application number
PCT/CN2017/113027
Other languages
French (fr)
Chinese (zh)
Inventor
李伦全
谢立海
郑车晓
Original Assignee
深圳市保益新能电气有限公司
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Filing date
Publication date
Application filed by 深圳市保益新能电气有限公司 filed Critical 深圳市保益新能电气有限公司
Publication of WO2019080245A1 publication Critical patent/WO2019080245A1/en

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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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
    • H02M7/81—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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 arranged for operation in parallel
    • 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

Definitions

  • the invention relates to a DC-DC converter, in particular to a wide-range bidirectional soft-switching DC conversion circuit and a control method thereof.
  • the main object of the present invention is to provide a wide-range bidirectional soft-switching DC conversion circuit and a control method thereof for the deficiencies of the prior art.
  • a wide-range bidirectional soft-switching DC conversion circuit comprising at least one first sub-conversion circuit, at least one second sub-conversion circuit and at least one controller;
  • the first sub-conversion circuit comprising a first series resonant inverter circuit, a high frequency isolation transformer, a common bridge arm and a first bridge arm;
  • the second sub conversion circuit includes a second series resonant inverter circuit, a second high frequency isolation transformer and a second bridge arm; first and second series resonance One side of the inverter circuit is connected to the first DC side, and the other side of the first and second series resonant inverter circuits are respectively connected to the first and second high frequency isolation transformers Connecting the two ends of the primary side;
  • the controller is configured to control the first and second series resonant inverter circuits, the common bridge arm, the first bridge arm, and the second bridge arm;
  • One end of a secondary side of a high frequency isolation transformer is connected to an intermediate point of the first bridge arm, and the other end is
  • the first series resonant inverter circuit includes two high frequency switching transistors Q3A and Q4A, a first driving circuit, a first filtering capacitor, a first resonant capacitor, and a first resonant inductor, the high frequency
  • the source of the switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A, one end of the first resonant capacitor is connected to one end of the first filter capacitor, and the drain of the high frequency switching transistor Q3A is The other end of the first filter capacitor is connected, the source of the high frequency switch transistor Q4A is connected to the other end of the first resonant capacitor, and an input end of the first high frequency isolation transformer is connected to the first resonant inductor through An intermediate point between the high frequency switch tube Q3A and the high frequency switch tube Q4A, and another input end of the first high frequency isolation transformer is connected to an intermediate point between the first resonant capacitor and the first filter capacitor
  • the first driving circuit is connected to the high frequency switching tube Q3A
  • the second series resonant inverter circuit includes two high frequency switching tubes Q3B, Q4B, a second driving circuit, a second filtering capacitor, a second resonant capacitor and a second resonant inductor, and a source connection of the high frequency switching transistor Q3B a drain of the high frequency switch transistor Q4B, one end of the second resonant capacitor is connected to one end of the second filter capacitor, and the drain of the high frequency switch transistor Q3B is connected to the other end of the second filter capacitor a source of the high frequency switching transistor Q4B is connected to the other end of the second resonant capacitor, and an input end of the second high frequency isolation transformer is connected to the high frequency switching transistor Q3B through the second resonant inductor An intermediate point of the high frequency switching transistor Q4B, and another input end of the second high frequency isolation transformer is connected to an intermediate point of the second resonant capacitor and the second filter capacitor, the second driving circuit and
  • the high frequency switch tube Q3B is connected to the high frequency switch
  • the common bridge arm includes two high frequency switching tubes Q11A and Q12A, and a drain of the high frequency switching tube Q12A is connected to a source of the high frequency switching tube Q11A;
  • the first bridge arm includes two high frequency switching tubes Q9A and Q10A, and the high frequency switching tube Q10A a drain connected to a source of the high frequency switching transistor Q9A;
  • the second bridge arm includes two high frequency switching tubes Q9B and Q10B, and the drain of the high frequency switching tube Q10B is connected to the source of the high frequency switching tube Q9B.
  • the forms of the first and second series resonant inverter circuits include a half bridge circuit and a full bridge circuit.
  • the first direct current side and the second direct current side are both devices or circuits that can provide or absorb energy.
  • the present invention also provides a control method for a wide range bidirectional soft switching DC conversion circuit, comprising the following steps:
  • the detection conversion circuit needs to output the voltage and the detection conversion circuit needs to work in the forward or reverse direction;
  • the forward operation means that the first DC side is the input, the second DC side is the output;
  • the reverse operation refers to the second The DC side is an input, and the first DC side is an output;
  • Controlling the working state of the conversion circuit according to the detection result comprising: if the first sub-transformation circuit or the second sub-conversion circuit is required to output a voltage, controlling the first sub-transformation circuit or the second sub-transformation circuit to enter a working state; The sum of the output voltages of the conversion circuit and the second sub-transformation circuit controls the first sub-transformation circuit and the second sub-transformation circuit to enter an active state;
  • the controlling the first sub-transformation circuit to enter an operating state comprises: operating the first series resonant inverter circuit, the first high-frequency isolating transformer, the shared bridge arm, and the first bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
  • the controlling the second sub-transformation circuit to enter an operating state comprises: operating the second series resonant inverter circuit, the second high-frequency isolating transformer, the shared bridge arm, and the second bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
  • the controlling the first sub-transformation circuit and the second sub-transformation circuit to enter an active state includes:
  • the primary side of the transformer forms an LLC conversion working circuit, and the control common bridge arm does not work.
  • the coupling voltage of the first high-frequency isolation transformer and the coupling voltage of the second high-frequency isolation transformer form a superposition relationship on the secondary side; forming a current path in the conversion circuit To achieve positive work;
  • the control common bridge arm does not work, the first bridge arm and the second bridge arm work, the sum of the withstand voltage of the secondary side of the first high frequency isolation transformer and the withstand voltage of the secondary side of the second high frequency isolation transformer form a current path,
  • the primary side of the transformer induces a voltage; the primary side of the transformer forms an LLC conversion working circuit to achieve reverse operation.
  • the first sub-transformation circuit and the second sub-conversion circuit are controlled to enter an active state, in a forward working state: according to a correspondence between an operating frequency of the series resonant inverter circuit and a resonant frequency, and according to an output
  • the voltage needs to be controlled to calculate a positive specific frequency. If the forward specific frequency is greater than the resonant frequency, it is a buck characteristic; The fixed frequency is less than the resonant frequency, which is the boosting characteristic.
  • the first sub-transformation circuit and the second sub-conversion circuit are controlled to enter an operating state, in a reverse operating state: according to the correspondence between the operating frequency of the series resonant inverter circuit and the resonant frequency, and according to the output voltage
  • the need to control the operation to output a reverse specific frequency if the reverse specific frequency is greater than the resonant frequency, it is the boost characteristic, if the reverse specific frequency is less than the resonant frequency, it is the buck characteristic.
  • the first series resonant inverter circuit includes two high frequency switching transistors Q3A and Q4A, the source of the high frequency switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A;
  • the series resonant inverter circuit includes two high frequency switching tubes Q3B and Q4B, and the source of the high frequency switching tube Q3B is connected to the drain of the high frequency switching tube Q4B;
  • a driving voltage is applied to the high frequency switch tube Q4A and the high frequency switch tube Q4B. Synchronous rectification is formed.
  • the present invention also provides a power conversion apparatus including a signal processor, a memory, and one or more programs, the one or more programs being stored in the memory and configured to be executed by the signal processor,
  • the program includes instructions for performing the above method.
  • the circuit complexity and loss caused by the bidirectional high-frequency switch in the transformer circuit are avoided, and the common bridge arm is multiplexed, so that the circuit is simple, the control is simple, and the turn-on timing is controlled in the forward or reverse direction to realize the bidirectional conversion. Cost-effective, efficient and reliable when working in different voltage segments.
  • the conversion circuit of the first high-frequency isolation transformer and the second high-frequency isolation transformer can be combined with the output voltage separately or simultaneously, and different voltages can be output, especially when the output voltage is combined to superimpose the output voltage, which can satisfy a wide range. work.
  • the present invention also has the following beneficial effects:
  • the inverter circuit adopts a full bridge circuit.
  • the primary side voltage of the full bridge circuit is twice that of the half bridge circuit, then the power full bridge type
  • the output power of the circuit is twice that of a half-bridge circuit, that is, the full-bridge circuit is suitable for high-power output.
  • FIG. 1 is a schematic structural view of a DC conversion circuit in the prior art
  • Figure 2 is a schematic structural view of a modification of Figure 1;
  • FIG. 3 is a schematic diagram showing the circuit structure of the secondary side of the transformer when the circuit of FIG. 1 operates in both directions;
  • FIG. 4 is a schematic structural view of a circuit of the present invention.
  • FIG. 5 is a flow chart of the control method of the present invention.
  • Figure 6 is a timing chart showing the control of the circuit of the present invention in the forward operation
  • Figure 7 is a timing chart showing the control of the circuit of the present invention in reverse operation
  • Fig. 8 is a schematic view showing the structure of a circuit according to a modification of the present invention.
  • a wide-range bidirectional soft-switching DC conversion circuit includes a first sub-conversion circuit and a second sub-conversion circuit, specifically including first and second series resonant inverter circuits 210 and 220, first and second high.
  • Frequency isolation transformers T RA and T RB shared bridge arm 330 , first and second bridge arms 310 and 320 and controller 400 ; one side of first and second series resonant inverter circuits 210 and 220 are used for the first The DC side 110 is connected, and the other sides of the first and second series resonant inverter circuits 210 and 220 are respectively connected to the two ends of the primary sides of the first and second high frequency isolation transformers T RA and T RB ;
  • the shared bridge arm 330, the first and second bridge arms 310 and 320 For controlling the first and second series resonant inverter circuits 210 and 220, the shared bridge arm 330, the first and second bridge arms 310 and 320; the first end 1A of the first side of the first high frequency isolation transformer T RA and the first The intermediate point of the bridge arm 310 is connected, and the other end 2A is connected to the intermediate point of the common bridge arm 330; the one end 1B of the secondary side of the second high frequency isolation transformer T
  • the first sub-conversion circuit and the second sub-transformation circuit are two independent different circuits, which can be separately output or input, or can be combined output or input at the same time, and are respectively controlled by the controller 400; the controller 400 needs to output the voltage according to the conversion circuit. And need to work in forward or reverse direction, forward or reverse control of the turn-on timing and control of the on/off of the shared bridge arm 330 such that the first sub-transform circuit, the second sub-conversion circuit forward or reverse alone or in combination with the output voltage to achieve Wide range bidirectional transformation.
  • the number of the first series resonant inverter circuit 210, the second series resonant inverter circuit 220, the first high frequency isolation transformer T RA and the second high frequency isolation transformer T RB is one, first The series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both half bridge circuits, and the common bridge arm 330, the first bridge arm 310, and the second bridge arm 320 rectifying elements are all high frequency having reverse parallel diodes. turning tube.
  • the first series resonant inverter circuit 210 includes two high frequency switching transistors Q3A and Q4A, a first driving circuit 211, a first filtering capacitor Cr2a, a first resonant capacitor Cr1a and a first resonant inductor Lra, and a source of the high frequency switching transistor Q3A.
  • the pole is connected to the drain of the high frequency switch Q4A, one end of the first resonant capacitor Cr1a is connected to one end of the first filter capacitor Cr2a, and the drain of the high frequency switch transistor Q3A is connected to the other end of the first filter capacitor Cr2a, the high frequency switch
  • the source of the tube Q4A is connected to the other end of the first resonant capacitor Cr1a, and an input terminal 4A of the first high-frequency isolating transformer T RA is connected to the middle of the high-frequency switch tube Q3A and the high-frequency switch tube Q4A through the first resonant inductor Lra.
  • the other input end 5A of the first high frequency isolation transformer T RA is connected with the intermediate point of the first resonant capacitor Cr1a and the first filter capacitor Cr2a, the first drive circuit 211 and the high frequency switch tube Q3A and the high frequency switch tube Q4A connection.
  • the second series resonant inverter circuit package 220 includes two high frequency switching tubes Q3B and Q4B, a second driving circuit 221, a second filtering capacitor Cr2b, a second resonant capacitor Cr1b and a second resonant inductor Lrb, and a high frequency switching transistor Q3B.
  • the source is connected to the drain of the high frequency switch Q4B, one end of the second resonant capacitor Cr1b is connected to one end of the second filter capacitor Cr2b, and the drain of the high frequency switch Q3B is connected to the other end of the second filter capacitor Cr2b.
  • the source of the switching transistor Q4B is connected to the other end of the second resonant capacitor Cr1b, and one input terminal 4B of the second high-frequency isolating transformer T RB is connected to the high-frequency switching transistor Q3B and the high-frequency switching transistor Q4B through the second resonant inductor Lrb.
  • the other input end 5B of the second high frequency isolation transformer T RB is connected to an intermediate point of the second resonant capacitor Cr1b and the second filter capacitor Cr2b, and the second drive circuit 221 and the high frequency switch tube Q3B and the high frequency switch tube Q4B is connected;
  • the common bridge arm 330 includes two high frequency switching tubes Q11A and Q12A, and the drain of the high frequency switching tube Q12A is connected to the source of the high frequency switching tube Q11A;
  • the first bridge arm 310 includes two high frequency switching tubes Q9A and Q10A, and the drain of the high frequency switching tube Q10A is connected to the source of the high frequency switching tube Q9A.
  • the second bridge arm 320 includes two high frequency switching tubes Q9B and Q10B, and the drain of the high frequency switching tube Q10B is connected to the source of the high frequency switching tube Q9B.
  • the first bridge arm 310 and the common bridge arm 330 are connected to the third driving circuit 303, the second bridge arm 320 is connected to the fourth driving circuit 304, and the controller 400 transmits a control signal to the third driving circuit 303 and the
  • the four driving circuit 304 controls the on and off of the first bridge arm 310, the second bridge arm 320 and the common bridge arm 330; the first side end 1A of the first high frequency isolation transformer T RA leads a lead O to the first bridge arm At the intermediate point of 310, the other end 2A is connected to the common bridge arm 330 and leads a lead A; one end 1B of the second high-frequency isolating transformer T RB also leads a lead A to be connected to the lead A of the first high-frequency isolating transformer T RA
  • the common bridge arm 330 is multiplexed with the first high frequency isolation transformer T RA , and the other end 2B is connected to the intermediate point of the second bridge arm 320 and leads a lead B.
  • the parameters of the filter capacitor Cr2a, the resonance capacitor Cr1a, the resonance inductor Lra, the high frequency switch transistor Q3A, and the high frequency switch transistor Q4A in the first sub-transformation circuit are the same as those of the second sub-transformation circuit, and the first high-frequency isolating transformer T RA
  • the primary winding is identical to the second high frequency isolation transformer T RB .
  • the first DC side 110 and the second DC side 120 are both devices or circuits that provide or absorb energy, one of which acts as an input and the other as an output.
  • the first DC side 110 includes a DC source V1 and a high voltage energy storage filter capacitor C1.
  • the positive and negative ends of the high voltage energy storage filter capacitor C1 are respectively connected to the positive and negative ends of the DC source V1.
  • the second DC side includes a DC source V2 and a filter capacitor C2, and two ends of the filter capacitor C2 are respectively connected to both ends of the DC source V2.
  • the forms of the DC sources V1 and V2 include a DC power source, a battery, and an AC rectified power supply.
  • the high-voltage energy storage filter capacitor C1 and the filter capacitor C2 may also be included in the first sub-transformation circuit or the second sub-conversion circuit, and the invention is not limited thereto.
  • One end 401 of the controller 400 inputs a sampling signal, and the other end 402 outputs a sampling signal.
  • the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are in an approximately parallel relationship, and the two are connected in parallel with the two ends of the high voltage energy storage filter capacitor C1 + BUS and The -BUS connection, that is, both ends of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in parallel with the DC source V1.
  • both ends of the first rectifier circuit and the second rectifier circuit are connected to both ends of the filter capacitor C2, that is, both ends of the first rectifier circuit and the second rectifier circuit. Both ends are connected to the DC source V2.
  • the high frequency switching transistors Q3A and Q4A, the first filter capacitor Cr2a, the first resonant capacitor Cr1a, and the first resonant inductor Lra in the first sub-conversion circuit are the same as in the second sub-conversion circuit,
  • the windings of the primary side of the first high frequency isolation transformer T RA and the second high frequency isolation transformer T RB are also identical.
  • the wide-range bidirectional soft-switching DC conversion circuit of the present invention adopts the following control method:
  • Controlling the working state of the conversion circuit according to the detection result comprising: if the first sub-transformation circuit or the second sub-conversion circuit is required to output a voltage, controlling the first sub-transformation circuit or the second sub-transformation circuit to enter a working state; The sum of the output voltages of the conversion circuit and the second sub-conversion circuit controls both the first sub-transformation circuit and the second sub-conversion circuit to enter an active state. That is, based on the detection result, the controller 400 controls the first and second sub-conversion circuits to operate, including which sub-transformation circuit is turned on and forward or reverse operation.
  • Controlling the first sub-transformation circuit to enter an operating state includes: operating the first series resonant inverter circuit 210, the first high-frequency isolating transformer T RA , the shared bridge arm 330, and the first bridge arm 310 according to LLC conversion and synchronous full-bridge rectification
  • the forward or reverse control turns on the timing to achieve forward or reverse operation. details as follows:
  • the controller 400 controls the turn-on timing in the forward or reverse direction.
  • a signal is sent to cause the first sub-conversion circuit to operate.
  • the primary side of the first high frequency isolation transformer T RA is a half bridge LLC conversion circuit, and the secondary side is formed by the common bridge arm 330 and the first bridge arm 310 to form a synchronous full bridge rectifier circuit, at which time the second bridge arm 320 does not operate. It can be controlled according to the conventional half bridge or full bridge LLC conversion and synchronous full bridge rectification control principle.
  • Controlling the second sub-transformation circuit to enter the working state comprises: operating the second series resonant inverter circuit, the second high-frequency isolation transformer, the shared bridge arm and the second bridge arm according to LLC conversion and synchronous full-bridge rectification, forward or reverse Turn on timing to control to work in forward or reverse direction. details as follows:
  • the controller 400 controls the turn-on timing in the forward or reverse direction.
  • a signal is sent to cause the second sub-conversion circuit to operate.
  • the primary side of the second high frequency isolation transformer T RB is a half bridge LLC conversion circuit, and the secondary side is formed by the common bridge arm 330 and the second bridge arm 320 to form a synchronous full bridge rectifier circuit, at which time the first bridge arm 310 does not operate. It can be controlled according to the conventional half bridge or full bridge LLC conversion and synchronous full bridge rectification control principle.
  • Controlling both the first sub-transformation circuit and the second sub-transformation circuit to enter a working state includes:
  • the primary side of the transformer forms an LLC conversion working circuit, and the control common bridge arm 330 does not work.
  • the coupling voltage of the first high frequency isolation transformer T RA and the coupling voltage of the second high frequency isolation transformer T RB form a superposition relationship on the secondary side; A current path is formed in the circuit to achieve forward operation. details as follows:
  • the high frequency switching transistors Q3A, Q4A, Q9A, Q10A and the second sub-conversion circuit in the first sub-conversion circuit are controlled by the controller 400.
  • the high frequency switching tubes Q3B, Q4B, Q9B, and Q10B are turned on and off, and at this time, the high frequency switching tubes Q11A and Q12A in the shared bridge arm 330 do not operate.
  • Control timing refers to Figure 6, when the high-frequency switch tubes Q3A and Q3B are turned on, or the high-frequency switch tubes Q4A and Q4B are turned on, the working circuit of the resonant half-bridge is formed on the primary side of the two transformers; after the high-frequency switch tubes Q3A and Q3B are turned on
  • the coupling voltages of the secondary sides of the two transformers are VTa and VTb respectively. According to the principle of the same name, the upper and lower negative voltages will naturally form a series relationship, and the common bridge arm 330 is equivalent to non-existent.
  • the O-lead end The terminal is positive and the B lead terminal is negative; when the sum of the coupling voltage VTa and the coupling voltage VTb is greater than the voltage of the DC source V2 or the diodes of the high frequency switching transistors Q9A and Q10B are positively biased, a current path is formed, thereby outputting a voltage.
  • the high-frequency switch tubes Q4A and Q4B are turned on, the coupling voltages of the secondary sides of the two transformers are VTa and VTb respectively. According to the principle of the same name, the upper and lower positive voltages will naturally form a series relationship.
  • the common bridge arm 330 is equivalent to non-existent.
  • the O lead terminal is negative and the B lead terminal is positive; when the sum of the coupling voltage VTa and the coupling voltage VTb is greater than the voltage of the DC source V2 or the diode of the high frequency switching transistors Q10A and Q9B When positively biased, a current path is formed to output a voltage.
  • the first sub-transformation circuit and the second sub-transformation circuit are controlled to enter a working state, and in the forward working state: according to the corresponding relationship between the operating frequency of the series resonant inverter circuit and the resonant frequency, and according to the needs of the output voltage After the operation, a positive specific frequency is output. If the forward specific frequency is greater than the resonant frequency, it is a step-down characteristic; if the forward specific frequency is smaller than the resonant frequency, it is a boosting characteristic. Specifically, if it is a step-down characteristic, the high frequency switching tubes Q9A and Q10B of the secondary side of the transformer are turned on, or the high frequency switching tubes Q10A and Q9B are turned on. Referring to FIG.
  • the control common bridge arm 330 does not work, the first bridge arm 310 and the second bridge arm 320 operate, the withstand voltage of the secondary side of the first high frequency isolation transformer T RA and the withstand voltage of the secondary side of the second high frequency isolation transformer T RB
  • the sum makes the current path formed, and the primary side of the transformer induces a voltage; the primary side of the transformer forms an LLC conversion working circuit to achieve reverse operation. details as follows:
  • the high frequency switching transistors Q3A, Q4A, Q9A, Q10A and the second sub-conversion circuit in the first sub-conversion circuit are controlled by the controller 400.
  • the high frequency switching tubes Q3B, Q4B, Q9B, and Q10B are turned on and off, and at this time, the high frequency switching tubes Q11A and Q12A in the shared bridge arm 330 do not operate.
  • Control timing Referring to Figure 7, after the high-frequency switch tubes Q9A and Q10B are turned on, the secondary sides of the two transformers will automatically withstand the voltages VTa and VTb according to the equivalent impedance respectively.
  • the upper and lower sides are negative, and the shared bridge arm 330 is not Opening is equivalent to non-existence. Therefore, the O lead terminal is positive and the B lead terminal is negative, that is, the sum of the voltage VTa and the voltage VTb is approximately equal to the voltage of the DC source V2, and the current path is formed.
  • the primary winding of the two transformers will be The induced voltage is due to the fact that the two are approximately parallel, so they have a reverse clamp for the voltage division of the voltages VTa and VTb.
  • the primary side induced voltages 4A, 4B are positive, and the 5A and 5B terminals are negative. Therefore, when the high frequency switching transistors Q3A and Q3B are forward biased, the current is output to the first DC side 110, if high frequency is given When the driving voltage is applied to the switching tubes Q3A and Q3B, the synchronous rectification relationship is formed.
  • the secondary sides of the two transformers are respectively subjected to the voltages VTa and VTb, according to the principle of the same name, Positive, the original shared bridge arm 330 is not open equivalent to no existence; therefore, the O lead end is negative, the B lead end is positive, the sum of the voltage VTa and the voltage VTb is approximately equal to the voltage of the DC source V2, the current path is formed, and two The primary coil of the transformer induces a voltage. Since the two are approximately parallel, they will have a reverse clamp for the voltage division of the voltage VTa and VTb. At this time, the primary induced voltages 5A and 5B are positive, 4A. The 4B terminal is negative.
  • the first sub-transformation circuit and the second sub-transformation circuit are controlled to enter a working state, and in the reverse working state: according to the corresponding relationship between the operating frequency of the series resonant inverter circuit and the resonant frequency, and the control operation according to the requirement of the output voltage
  • the reverse specific frequency is greater than the resonant frequency, it is a boosting characteristic. If the reverse specific frequency is less than the resonant frequency, It is the buck characteristic.
  • the high-frequency switch tubes Q3A and Q3B on the secondary side of the transformer, or the high-frequency switch tubes Q4A and Q4B, will be de-energized according to the magnitude of the load current and the electric compression.
  • the present invention avoids the circuit complexity and loss caused by the bidirectional high-frequency switch in the transformer circuit, and multiplexes the common bridge arm, so that the circuit is simple, the control is simple, and the turn-on timing is controlled in the forward or reverse direction. Achieve two-way transformation, improve cost performance, high efficiency and reliability when working in different voltage segments.
  • the conversion circuit of the first high-frequency isolation transformer and the second high-frequency isolation transformer can be combined with the output voltage separately or simultaneously, and different voltages can be output, especially when the output voltage is combined to superimpose the output voltage, which can satisfy a wide range. work.
  • the resonant mode of the first and second series resonant inverter circuits can realize soft switching, which can reduce the opening and closing stress of each electronic component in the inverter circuit, thereby reducing switching loss and helping to improve the inverter circuit.
  • Operating frequency or efficiency which in turn reduces volume or increases power density.
  • the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 may also be in the form of a full bridge circuit; the inverter circuit adopts a full bridge circuit, and the input current of the conversion circuit is the same, and the input voltage is In the same case, the primary side voltage of the full bridge circuit is twice that of the half bridge circuit, then the output power of the power full bridge circuit is twice that of the half bridge circuit, that is, the full bridge circuit is suitable for high power.
  • the present invention also provides an electrical energy conversion apparatus comprising a signal processor, a memory and one or more programs, the one or more programs being stored in the memory and configured to be executed by a signal processor, the program comprising Method of instruction.

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Abstract

A wide-range bidirectional soft switch direct current (DC) conversion circuit and a control method therefor. The circuit comprises at least one first conversion sub-circuit, at least one second conversion sub-circuit and at least one controller (400); the first conversion sub-circuit comprises a first series connection resonance inversion circuit (210), a first high frequency isolation transformer (TRA), a common bridge arm (330) and a first bridge arm (310); and the second conversion sub-circuit comprises a second series connection inverter circuit (220), a second high frequency isolation transformer (TRB) and a second bridge arm (320). With the described method, a switch sequence is controlled in a forward direction or reverse direction according to voltage which the conversion circuit needs to be output and whether the conversion circuit needs to work in a forward direction or a reverse direction, and controls the connection of the common bridge arm (330) so as to make the first conversion sub-circuit and the second conversion sub-circuit output voltage independently or jointly in the forward direction or the reverse direction, thereby realizing wide-range bidirectional conversion. The circuit is simple in structure, easy to control and high in price-performance ratio, and may meet the needs of a wide range work.

Description

一种宽范围双向软开关直流变换电路及其控制方法Wide-range bidirectional soft-switching DC conversion circuit and control method thereof 技术领域Technical field
本发明涉及直流-直流变换器，特别涉及一种宽范围双向软开关直流变换电路及其控制方法。The invention relates to a DC-DC converter, in particular to a wide-range bidirectional soft-switching DC conversion circuit and a control method thereof.
背景技术Background technique
随着储能产品以及电池设备相关领域的快速发展，对可以进行双向变换的电源产品需求也越来越多，同时考虑到不同产品的兼容性，对应的电压范围也越来越宽，因此常规的采用两套电路(充电、放电)来实现双向变换已经不具备成本优势，同时普通的电路在效率以及满足宽电压范围方面也有不足；在单方向工作的产品现有的解决办法较多的采用在变压器上加多一个绕组，参考图1，绕组根据电压需要用开关类器件S1进行切换接入；参考图2，而如果需要使用两个线圈的电压，则需要有两路切换开关S1、S2，在原来基础上同一个变压器多绕组则意味每个电压组都需要加上开关器件，则电路会显得十分复杂，且效率会降低。如果双方向工作时，参考图3，虽然将变压器次级的整流二极管更换为高频开关管，但电路复杂以及效率低下的缺点依然会存在，同时该单变压器的输出功率也有限，如果按照常规推理加多一个前述的单元来扩充功率，电路更加复杂，性价比很低。With the rapid development of energy storage products and battery equipment related fields, there is an increasing demand for power supply products that can be bidirectionally transformed. At the same time, considering the compatibility of different products, the corresponding voltage range is also wider and wider, so conventional The use of two sets of circuits (charging, discharging) to achieve bidirectional conversion has no cost advantage, while the ordinary circuit also has insufficient efficiency and wide voltage range; the existing solutions for products working in one direction are more adopted. Add one more winding to the transformer. Referring to Figure 1, the winding is switched by the switching device S1 according to the voltage; refer to Figure 2, and if two coils are required, two switches S1 and S2 are required. On the basis of the original transformer multi-winding means that each voltage group needs to add a switching device, the circuit will be very complicated and the efficiency will be reduced. If working in both directions, referring to Figure 3, although the rectifier diode of the transformer secondary is replaced with a high frequency switching transistor, the disadvantages of complicated circuit and low efficiency still exist, and the output power of the single transformer is also limited, if conventional Inference adds one more unit to expand the power, the circuit is more complicated, and the cost performance is very low.
发明内容Summary of the invention
本发明的主要目的就是针对现有技术的不足，提供一种宽范围双向软开关直流变换电路及其控制方法。The main object of the present invention is to provide a wide-range bidirectional soft-switching DC conversion circuit and a control method thereof for the deficiencies of the prior art.
本发明采用以下技术方案：The invention adopts the following technical solutions:
一种宽范围双向软开关直流变换电路，包括至少一个第一子变换电路、至少一个第二子变换电路和至少一个控制器；所述第一子变换电路包括第一串联谐振逆变电路、第一高频隔离变压器、共用桥臂和第一桥臂；所述第二子变换电路包括第二串联谐振逆变电路、第二高频隔离变压器和第二桥臂；第一及第二串联谐振逆变电路的一侧用于与第一直流侧连接，第一及第二串联谐振逆变电路的另一侧分别与第一及第二高频隔离变压器 的原边的两端连接；所述控制器用于控制所述第一及第二串联谐振逆变电路、所述共用桥臂、所述第一桥臂和所述第二桥臂；所述第一高频隔离变压器的副边的一端与所述第一桥臂的中间点连接，另一端与所述共用桥臂的中间点连接；所述第二高频隔离变压器的副边的一端与所述共用桥臂的中间点连接，另一端与所述第二桥臂的中间点连接；所述共用桥臂的两端与所述第一桥臂的两端分别连接形成第一路整流电路；所述共用桥臂的两端与所述第二桥臂的两端分别连接形成第二路整流电路；所述第一路整流电路的两端、所述第二路整流电路的两端用于与第二直流侧连接；所述控制器根据变换电路需要输出的电压以及需要正向还是反向工作，正向或反向控制开通时序以及控制所述共用桥臂的通断使所述第一子变换电路、所述第二子变换电路正向或反向单独或者联合输出电压以实现宽范围双向变换。A wide-range bidirectional soft-switching DC conversion circuit comprising at least one first sub-conversion circuit, at least one second sub-conversion circuit and at least one controller; the first sub-conversion circuit comprising a first series resonant inverter circuit, a high frequency isolation transformer, a common bridge arm and a first bridge arm; the second sub conversion circuit includes a second series resonant inverter circuit, a second high frequency isolation transformer and a second bridge arm; first and second series resonance One side of the inverter circuit is connected to the first DC side, and the other side of the first and second series resonant inverter circuits are respectively connected to the first and second high frequency isolation transformers Connecting the two ends of the primary side; the controller is configured to control the first and second series resonant inverter circuits, the common bridge arm, the first bridge arm, and the second bridge arm; One end of a secondary side of a high frequency isolation transformer is connected to an intermediate point of the first bridge arm, and the other end is connected to an intermediate point of the common bridge arm; one end of the secondary side of the second high frequency isolation transformer is The intermediate point of the common bridge arm is connected, and the other end is connected to the intermediate point of the second bridge arm; the two ends of the common bridge arm are respectively connected with the two ends of the first bridge arm to form a first way rectifier circuit; The two ends of the common bridge arm and the two ends of the second bridge arm are respectively connected to form a second circuit rectifier circuit; two ends of the first circuit rectifier circuit and two ends of the second circuit rectifier circuit are used for Connected to the second DC side; the controller according to the voltage that the conversion circuit needs to output and whether it needs to work in forward or reverse direction, the forward or reverse control of the turn-on timing and the control of the on and off of the common bridge arm to make the first Sub-transformation circuit, said second sub-transformation circuit forward or reverse Alone or in combination to achieve a wide range of output voltages double conversion.
在一些优选的实施方式中，第一串联谐振逆变电路包括两个高频开关管Q3A和Q4A、第一驱动电路、第一滤波电容、第一谐振电容和第一谐振电感，所述高频开关管Q3A的源极连接所述高频开关管Q4A的漏极，所述第一谐振电容的一端与所述第一滤波电容的一端连接，所述高频开关管Q3A的漏极与所述第一滤波电容的另一端连接，所述高频开关管Q4A的源极与所述第一谐振电容的另一端连接，第一高频隔离变压器的一个输入端通过所述第一谐振电感连接到所述高频开关管Q3A与所述高频开关管Q4A的中间点，所述第一高频隔离变压器的另一个输入端与所述第一谐振电容和所述第一滤波电容的中间点连接，所述第一驱动电路与所述高频开关管Q3A和所述高频开关管Q4A连接；In some preferred embodiments, the first series resonant inverter circuit includes two high frequency switching transistors Q3A and Q4A, a first driving circuit, a first filtering capacitor, a first resonant capacitor, and a first resonant inductor, the high frequency The source of the switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A, one end of the first resonant capacitor is connected to one end of the first filter capacitor, and the drain of the high frequency switching transistor Q3A is The other end of the first filter capacitor is connected, the source of the high frequency switch transistor Q4A is connected to the other end of the first resonant capacitor, and an input end of the first high frequency isolation transformer is connected to the first resonant inductor through An intermediate point between the high frequency switch tube Q3A and the high frequency switch tube Q4A, and another input end of the first high frequency isolation transformer is connected to an intermediate point between the first resonant capacitor and the first filter capacitor The first driving circuit is connected to the high frequency switching tube Q3A and the high frequency switching tube Q4A;
第二串联谐振逆变电路包括两个高频开关管Q3B、Q4B、第二驱动电路、第二滤波电容、第二谐振电容和第二谐振电感，所述高频开关管Q3B的源极连接所述高频开关管Q4B的漏极，所述第二谐振电容的一端与所述第二滤波电容的一端连接，所述高频开关管Q3B的漏极与所述第二滤波电容的另一端连接，所述高频开关管Q4B的源极与所述第二谐振电容的另一端连接，第二高频隔离变压器的一个输入端通过所述第二谐振电感连接到所述高频开关管Q3B与所述高频开关管Q4B的中间点，所述第二高频隔离变压器的另一个输入端与所述第二谐振电容和所述第二滤波电容的中间点连接，所述第二驱动电路与所述高频开关管Q3B和所述高频开关管Q4B连接；The second series resonant inverter circuit includes two high frequency switching tubes Q3B, Q4B, a second driving circuit, a second filtering capacitor, a second resonant capacitor and a second resonant inductor, and a source connection of the high frequency switching transistor Q3B a drain of the high frequency switch transistor Q4B, one end of the second resonant capacitor is connected to one end of the second filter capacitor, and the drain of the high frequency switch transistor Q3B is connected to the other end of the second filter capacitor a source of the high frequency switching transistor Q4B is connected to the other end of the second resonant capacitor, and an input end of the second high frequency isolation transformer is connected to the high frequency switching transistor Q3B through the second resonant inductor An intermediate point of the high frequency switching transistor Q4B, and another input end of the second high frequency isolation transformer is connected to an intermediate point of the second resonant capacitor and the second filter capacitor, the second driving circuit and The high frequency switch tube Q3B is connected to the high frequency switch tube Q4B;
所述共用桥臂包括两个高频开关管Q11A和Q12A，所述高频开关管Q12A的漏极与所述高频开关管Q11A的源极连接；The common bridge arm includes two high frequency switching tubes Q11A and Q12A, and a drain of the high frequency switching tube Q12A is connected to a source of the high frequency switching tube Q11A;
所述第一桥臂包括两个高频开关管Q9A和Q10A，所述高频开关管Q10A 的漏极与所述高频开关管Q9A的源极连接；The first bridge arm includes two high frequency switching tubes Q9A and Q10A, and the high frequency switching tube Q10A a drain connected to a source of the high frequency switching transistor Q9A;
所述第二桥臂包括两个高频开关管Q9B和Q10B，所述高频开关管Q10B的漏极与所述高频开关管Q9B的源极连接。The second bridge arm includes two high frequency switching tubes Q9B and Q10B, and the drain of the high frequency switching tube Q10B is connected to the source of the high frequency switching tube Q9B.
在一些优选的实施方式中，所述第一及第二串联谐振逆变电路的形式包括半桥式电路和全桥式电路。In some preferred embodiments, the forms of the first and second series resonant inverter circuits include a half bridge circuit and a full bridge circuit.
在一些优选的实施方式中，所述第一直流侧、所述第二直流侧均为可提供或者可吸收能量的装置或者电路。In some preferred embodiments, the first direct current side and the second direct current side are both devices or circuits that can provide or absorb energy.
在另一方面，本发明还提供一种宽范围双向软开关直流变换电路的控制方法，包括如下步骤：In another aspect, the present invention also provides a control method for a wide range bidirectional soft switching DC conversion circuit, comprising the following steps:
检测变换电路需要输出的电压以及检测变换电路需要正向还是反向工作；所述正向工作是指第一直流侧为输入，第二直流侧为输出；所述反向工作是指第二直流侧为输入，第一直流侧为输出；The detection conversion circuit needs to output the voltage and the detection conversion circuit needs to work in the forward or reverse direction; the forward operation means that the first DC side is the input, the second DC side is the output; the reverse operation refers to the second The DC side is an input, and the first DC side is an output;
根据检测结果控制变换电路的工作状态，包括：若需要第一子变换电路或第二子变换电路输出电压，则控制第一子变换电路或第二子变换电路进入工作状态；若需要第一子变换电路和第二子变换电路的输出电压之和，则控制第一子变换电路和第二子变换电路均进入工作状态；Controlling the working state of the conversion circuit according to the detection result, comprising: if the first sub-transformation circuit or the second sub-conversion circuit is required to output a voltage, controlling the first sub-transformation circuit or the second sub-transformation circuit to enter a working state; The sum of the output voltages of the conversion circuit and the second sub-transformation circuit controls the first sub-transformation circuit and the second sub-transformation circuit to enter an active state;
所述控制第一子变换电路进入工作状态包括：使第一串联谐振逆变电路、第一高频隔离变压器、共用桥臂和第一桥臂按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作；The controlling the first sub-transformation circuit to enter an operating state comprises: operating the first series resonant inverter circuit, the first high-frequency isolating transformer, the shared bridge arm, and the first bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
所述控制第二子变换电路进入工作状态包括：使第二串联谐振逆变电路、第二高频隔离变压器、共用桥臂和第二桥臂按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作；The controlling the second sub-transformation circuit to enter an operating state comprises: operating the second series resonant inverter circuit, the second high-frequency isolating transformer, the shared bridge arm, and the second bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
所述控制第一子变换电路和第二子变换电路均进入工作状态包括：The controlling the first sub-transformation circuit and the second sub-transformation circuit to enter an active state includes:
变压器的原边形成LLC变换工作回路，控制共用桥臂不工作，第一高频隔离变压器的耦合电压和第二高频隔离变压器的耦合电压在副边形成叠加关系；使变换电路中形成电流通路，从而实现正向工作；The primary side of the transformer forms an LLC conversion working circuit, and the control common bridge arm does not work. The coupling voltage of the first high-frequency isolation transformer and the coupling voltage of the second high-frequency isolation transformer form a superposition relationship on the secondary side; forming a current path in the conversion circuit To achieve positive work;
控制共用桥臂不工作，第一桥臂和第二桥臂工作，第一高频隔离变压器的副边的承受电压和第二高频隔离变压器的副边的承受电压之和使电流通路形成，变压器的原边感应出电压；变压器的原边形成LLC变换工作回路，实现反向工作。The control common bridge arm does not work, the first bridge arm and the second bridge arm work, the sum of the withstand voltage of the secondary side of the first high frequency isolation transformer and the withstand voltage of the secondary side of the second high frequency isolation transformer form a current path, The primary side of the transformer induces a voltage; the primary side of the transformer forms an LLC conversion working circuit to achieve reverse operation.
在一些优选的实施方式中，控制第一子变换电路和第二子变换电路均进入工作状态，正向工作状态下：根据串联谐振逆变电路的工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个正向特定频率，如果正向特定频率大于谐振频率，则是降压特性；如果正向特 定频率小于谐振频率，则是升压特性。In some preferred embodiments, the first sub-transformation circuit and the second sub-conversion circuit are controlled to enter an active state, in a forward working state: according to a correspondence between an operating frequency of the series resonant inverter circuit and a resonant frequency, and according to an output The voltage needs to be controlled to calculate a positive specific frequency. If the forward specific frequency is greater than the resonant frequency, it is a buck characteristic; The fixed frequency is less than the resonant frequency, which is the boosting characteristic.
在一些优选的实施方式中，控制第一子变换电路和第二子变换电路均进入工作状态，反向工作状态下：根据串联谐振逆变电路工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个反向特定频率，如果反向特定频率大于谐振频率，则是升压特性，如果反向特定频率小于谐振频率，则是降压特性。In some preferred embodiments, the first sub-transformation circuit and the second sub-conversion circuit are controlled to enter an operating state, in a reverse operating state: according to the correspondence between the operating frequency of the series resonant inverter circuit and the resonant frequency, and according to the output voltage The need to control the operation to output a reverse specific frequency, if the reverse specific frequency is greater than the resonant frequency, it is the boost characteristic, if the reverse specific frequency is less than the resonant frequency, it is the buck characteristic.
在进一步优选的实施方式中，第一串联谐振逆变电路包括两个高频开关管Q3A和Q4A,所述高频开关管Q3A的源极连接所述高频开关管Q4A的漏极；第二串联谐振逆变电路包括两个高频开关管Q3B和Q4B，所述高频开关管Q3B的源极连接所述高频开关管Q4B的漏极；反向工作状态下：In a further preferred embodiment, the first series resonant inverter circuit includes two high frequency switching transistors Q3A and Q4A, the source of the high frequency switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A; The series resonant inverter circuit includes two high frequency switching tubes Q3B and Q4B, and the source of the high frequency switching tube Q3B is connected to the drain of the high frequency switching tube Q4B;
所述高频开关管Q3A和所述高频开关管Q3B被正偏时，向所述高频开关管Q3A和所述高频开关管Q3B施加驱动电压以形成同步整流。When the high frequency switching transistor Q3A and the high frequency switching transistor Q3B are forwardly biased, a driving voltage is applied to the high frequency switching transistor Q3A and the high frequency switching transistor Q3B to form synchronous rectification.
在进一步优选的实施方式中，所述高频开关管(Q4A)和所述高频开关管Q4B被正偏时，向所述高频开关管Q4A和所述高频开关管Q4B施加驱动电压以形成同步整流。In a further preferred embodiment, when the high frequency switch tube (Q4A) and the high frequency switch tube Q4B are forward biased, a driving voltage is applied to the high frequency switch tube Q4A and the high frequency switch tube Q4B. Synchronous rectification is formed.
本发明还提供一种电能变换装置，包括信号处理器、存储器和一个或多个程序，所述一个或多个程序被存储在所述存储器中，并且被配置成由所述信号处理器执行，所述程序包括用于执行上述方法的指令。The present invention also provides a power conversion apparatus including a signal processor, a memory, and one or more programs, the one or more programs being stored in the memory and configured to be executed by the signal processor, The program includes instructions for performing the above method.
与现有技术相比，本发明的有益效果有：Compared with the prior art, the beneficial effects of the present invention are:
避免了在变压器回路串联双向可通的高频开关带来的电路复杂性以及损耗，复用共用桥臂，使得电路简洁、控制简单，正向或反向控制开通时序以实现双向变换，具有高性价比，不同电压段工作的时候效率高、可靠。通过控制，可使第一高频隔离变压器、第二高频隔离变压器所在的变换电路单独或者同时联合输出电压，可以输出不同电压，特别是联合输出电压时使输出电压得到叠加，可以满足宽范围的工作。The circuit complexity and loss caused by the bidirectional high-frequency switch in the transformer circuit are avoided, and the common bridge arm is multiplexed, so that the circuit is simple, the control is simple, and the turn-on timing is controlled in the forward or reverse direction to realize the bidirectional conversion. Cost-effective, efficient and reliable when working in different voltage segments. Through the control, the conversion circuit of the first high-frequency isolation transformer and the second high-frequency isolation transformer can be combined with the output voltage separately or simultaneously, and different voltages can be output, especially when the output voltage is combined to superimpose the output voltage, which can satisfy a wide range. work.
在优选的实施方式中，本发明还具有如下有益效果：In a preferred embodiment, the present invention also has the following beneficial effects:
进一步地，逆变电路采用全桥式电路，在变换电路的输入电流相同、输入电压也相同的情况下，全桥式电路的原边电压为半桥式电路的两倍，那么功率全桥式电路的输出功率是半桥式电路的两倍，也即全桥式电路适合大功率输出。Further, the inverter circuit adopts a full bridge circuit. When the input current of the conversion circuit is the same and the input voltage is the same, the primary side voltage of the full bridge circuit is twice that of the half bridge circuit, then the power full bridge type The output power of the circuit is twice that of a half-bridge circuit, that is, the full-bridge circuit is suitable for high-power output.
附图说明DRAWINGS
图1为现有技术中的一种直流变换电路的结构示意图；1 is a schematic structural view of a DC conversion circuit in the prior art;
图2为图1的一种变型方式的结构示意图； Figure 2 is a schematic structural view of a modification of Figure 1;
图3为图1中的电路双方向工作时变压器副边的电路结构示意图；3 is a schematic diagram showing the circuit structure of the secondary side of the transformer when the circuit of FIG. 1 operates in both directions;
图4为本发明的电路结构示意图；4 is a schematic structural view of a circuit of the present invention;
图5为本发明的控制方法的流程图；Figure 5 is a flow chart of the control method of the present invention;
图6为本发明的电路的正向工作时的控制时序图；Figure 6 is a timing chart showing the control of the circuit of the present invention in the forward operation;
图7为本发明的电路的反向工作时的控制时序图；Figure 7 is a timing chart showing the control of the circuit of the present invention in reverse operation;
图8为本发明的一种变形方式的电路结构示意图。Fig. 8 is a schematic view showing the structure of a circuit according to a modification of the present invention.
具体实施方式Detailed ways
以下对本发明的实施方式作详细说明。应该强调的是，下述说明仅仅是示例性的，而不是为了限制本发明的范围及其应用。Embodiments of the invention are described in detail below. It is to be understood that the following description is only illustrative, and is not intended to limit the scope of the invention.
参考图4，一种宽范围双向软开关直流变换电路，包括第一子变换电路和第二子变换电路，具体包括第一及第二串联谐振逆变电路210及220、第一及第二高频隔离变压器TRA及TRB、共用桥臂330、第一及第二桥臂310及320和控制器400；第一及第二串联谐振逆变电路210及220的一侧用于与第一直流侧110连接，第一及第二串联谐振逆变电路210及220的另一侧分别与第一及第二高频隔离变压器TRA及TRB的原边的两端连接；控制器400用于控制第一及第二串联谐振逆变电路210及220、共用桥臂330、第一及第二桥臂310及320；第一高频隔离变压器TRA的副边的一端1A与第一桥臂310的中间点连接，另一端2A与共用桥臂330的中间点连接；第二高频隔离变压器TRB的副边的一端1B与共用桥臂330的中间点连接，另一端2B与第二桥臂320的中间点连接；共用桥臂330的两端与第一桥臂的两端分别连接形成第一路整流电路；共用桥臂330的两端与第二桥臂320的两端分别连接形成第二路整流电路；第一路整流电路的两端、第二路整流电路的两端用于与第二直流侧120连接；就第一子变换电路而言，其包括第一串联谐振逆变电路210、第一高频隔离变压器TRA、共用桥臂330、第一桥臂310；就第二子变换电路而言，其包括第二串联谐振逆变电路220、第二高频隔离变压器TRB、共用桥臂330、第二桥臂320。第一子变换电路和第二子变换电路是两个独立的不同回路，可以单独输出或输入，也可以同时联合输出或输入，由控制器400分别控制；控制器400根据变换电路需要输出的电压以及需要正向还是反向工作，正向或反向控制开通时序以及控制共用桥臂330的通断使第一子变换电路、第二子变换电路正向或反向单独或者联合输出电压以实现宽范围双向变换。 Referring to FIG. 4, a wide-range bidirectional soft-switching DC conversion circuit includes a first sub-conversion circuit and a second sub-conversion circuit, specifically including first and second series resonant inverter circuits 210 and 220, first and second high. Frequency isolation transformers T RA and T RB , shared bridge arm 330 , first and second bridge arms 310 and 320 and controller 400 ; one side of first and second series resonant inverter circuits 210 and 220 are used for the first The DC side 110 is connected, and the other sides of the first and second series resonant inverter circuits 210 and 220 are respectively connected to the two ends of the primary sides of the first and second high frequency isolation transformers T RA and T RB ; For controlling the first and second series resonant inverter circuits 210 and 220, the shared bridge arm 330, the first and second bridge arms 310 and 320; the first end 1A of the first side of the first high frequency isolation transformer T RA and the first The intermediate point of the bridge arm 310 is connected, and the other end 2A is connected to the intermediate point of the common bridge arm 330; the one end 1B of the secondary side of the second high frequency isolation transformer T RB is connected to the intermediate point of the common bridge arm 330, and the other end is 2B and the The intermediate point of the second bridge arm 320 is connected; the two ends of the common bridge arm 330 are respectively connected with the two ends of the first bridge arm Forming a first way rectifying circuit; the two ends of the common bridge arm 330 and the two ends of the second bridge arm 320 are respectively connected to form a second way rectifying circuit; the two ends of the first rectifying circuit and the two ends of the second rectifying circuit are used Connected to the second DC side 120; for the first sub-conversion circuit, it includes a first series resonant inverter circuit 210, a first high frequency isolation transformer T RA , a common bridge arm 330, and a first bridge arm 310; The second sub-transformation circuit includes a second series resonant inverter circuit 220, a second high frequency isolation transformer T RB , a common bridge arm 330, and a second bridge arm 320. The first sub-conversion circuit and the second sub-transformation circuit are two independent different circuits, which can be separately output or input, or can be combined output or input at the same time, and are respectively controlled by the controller 400; the controller 400 needs to output the voltage according to the conversion circuit. And need to work in forward or reverse direction, forward or reverse control of the turn-on timing and control of the on/off of the shared bridge arm 330 such that the first sub-transform circuit, the second sub-conversion circuit forward or reverse alone or in combination with the output voltage to achieve Wide range bidirectional transformation.
具体的，参考图4，第一串联谐振逆变电路210、第二串联谐振逆变电路220、第一高频隔离变压器TRA和第二高频隔离变压器TRB的数量均为一个，第一串联谐振逆变电路210和第二串联谐振逆变电路220均为半桥式电路，共用桥臂330、第一桥臂310、第二桥臂320整流元件均为具备反向并联二极管的高频开关管。第一串联谐振逆变电路210包括两个高频开关管Q3A和Q4A、第一驱动电路211、第一滤波电容Cr2a、第一谐振电容Cr1a和第一谐振电感Lra，高频开关管Q3A的源极连接高频开关管Q4A的漏极，第一谐振电容Cr1a的一端与第一滤波电容Cr2a的一端连接，高频开关管Q3A的漏极与第一滤波电容Cr2a的另一端连接，高频开关管Q4A的源极与第一谐振电容Cr1a的另一端连接，第一高频隔离变压器TRA的一个输入端4A通过第一谐振电感Lra连接到高频开关管Q3A与高频开关管Q4A的中间点，第一高频隔离变压器TRA的另一个输入端5A与第一谐振电容Cr1a与第一滤波电容Cr2a的中间点连接，第一驱动电路211与高频开关管Q3A和高频开关管Q4A连接。Specifically, referring to FIG. 4, the number of the first series resonant inverter circuit 210, the second series resonant inverter circuit 220, the first high frequency isolation transformer T RA and the second high frequency isolation transformer T RB is one, first The series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both half bridge circuits, and the common bridge arm 330, the first bridge arm 310, and the second bridge arm 320 rectifying elements are all high frequency having reverse parallel diodes. turning tube. The first series resonant inverter circuit 210 includes two high frequency switching transistors Q3A and Q4A, a first driving circuit 211, a first filtering capacitor Cr2a, a first resonant capacitor Cr1a and a first resonant inductor Lra, and a source of the high frequency switching transistor Q3A. The pole is connected to the drain of the high frequency switch Q4A, one end of the first resonant capacitor Cr1a is connected to one end of the first filter capacitor Cr2a, and the drain of the high frequency switch transistor Q3A is connected to the other end of the first filter capacitor Cr2a, the high frequency switch The source of the tube Q4A is connected to the other end of the first resonant capacitor Cr1a, and an input terminal 4A of the first high-frequency isolating transformer T RA is connected to the middle of the high-frequency switch tube Q3A and the high-frequency switch tube Q4A through the first resonant inductor Lra. Point, the other input end 5A of the first high frequency isolation transformer T RA is connected with the intermediate point of the first resonant capacitor Cr1a and the first filter capacitor Cr2a, the first drive circuit 211 and the high frequency switch tube Q3A and the high frequency switch tube Q4A connection.
第二串联谐振逆变电路包220括两个高频开关管Q3B和Q4B、第二驱动电路221、第二滤波电容Cr2b、第二谐振电容Cr1b和第二谐振电感Lrb，高频开关管Q3B的源极连接高频开关管Q4B的漏极，第二谐振电容Cr1b的一端与第二滤波电容Cr2b的一端连接，高频开关管Q3B的漏极与第二滤波电容Cr2b的另一端连接，高频开关管Q4B的源极与第二谐振电容Cr1b的另一端连接，第二高频隔离变压器TRB的一个输入端4B通过第二谐振电感Lrb连接到高频开关管Q3B与高频开关管Q4B的中间点，第二高频隔离变压器TRB的另一个输入端5B与第二谐振电容Cr1b与第二滤波电容Cr2b的中间点连接，第二驱动电路221与高频开关管Q3B和高频开关管Q4B连接；共用桥臂330包括两个高频开关管Q11A和Q12A，高频开关管Q12A的漏极与高频开关管Q11A的源极连接；The second series resonant inverter circuit package 220 includes two high frequency switching tubes Q3B and Q4B, a second driving circuit 221, a second filtering capacitor Cr2b, a second resonant capacitor Cr1b and a second resonant inductor Lrb, and a high frequency switching transistor Q3B. The source is connected to the drain of the high frequency switch Q4B, one end of the second resonant capacitor Cr1b is connected to one end of the second filter capacitor Cr2b, and the drain of the high frequency switch Q3B is connected to the other end of the second filter capacitor Cr2b. The source of the switching transistor Q4B is connected to the other end of the second resonant capacitor Cr1b, and one input terminal 4B of the second high-frequency isolating transformer T RB is connected to the high-frequency switching transistor Q3B and the high-frequency switching transistor Q4B through the second resonant inductor Lrb. At an intermediate point, the other input end 5B of the second high frequency isolation transformer T RB is connected to an intermediate point of the second resonant capacitor Cr1b and the second filter capacitor Cr2b, and the second drive circuit 221 and the high frequency switch tube Q3B and the high frequency switch tube Q4B is connected; the common bridge arm 330 includes two high frequency switching tubes Q11A and Q12A, and the drain of the high frequency switching tube Q12A is connected to the source of the high frequency switching tube Q11A;
第一桥臂310包括两个高频开关管Q9A和Q10A，高频开关管Q10A的漏极与高频开关管Q9A的源极连接。The first bridge arm 310 includes two high frequency switching tubes Q9A and Q10A, and the drain of the high frequency switching tube Q10A is connected to the source of the high frequency switching tube Q9A.
第二桥臂320包括两个高频开关管Q9B和Q10B，高频开关管Q10B的漏极与高频开关管Q9B的源极连接。The second bridge arm 320 includes two high frequency switching tubes Q9B and Q10B, and the drain of the high frequency switching tube Q10B is connected to the source of the high frequency switching tube Q9B.
参考图4，第一桥臂310和共用桥臂330与第三驱动电路303连接，、第二桥臂320与第四驱动电路304连接，控制器400发送控制信号到第三 驱动电路303和第四驱动电路304，从而控制第一桥臂310、第二桥臂320和共用桥臂330的通断；第一高频隔离变压器TRA的副边一端1A引出一条引线O连接到第一桥臂310的中间点，另一端2A与共用桥臂330连接且引出一条引线A；第二高频隔离变压器TRB的一端1B也相应引出一条引线A与第一高频隔离变压器TRA的引线A连接，与第一高频隔离变压器TRA一起复用共用桥臂330，另一端2B则连接到第二桥臂320的中间点且引出一条引线B。Referring to FIG. 4, the first bridge arm 310 and the common bridge arm 330 are connected to the third driving circuit 303, the second bridge arm 320 is connected to the fourth driving circuit 304, and the controller 400 transmits a control signal to the third driving circuit 303 and the The four driving circuit 304 controls the on and off of the first bridge arm 310, the second bridge arm 320 and the common bridge arm 330; the first side end 1A of the first high frequency isolation transformer T RA leads a lead O to the first bridge arm At the intermediate point of 310, the other end 2A is connected to the common bridge arm 330 and leads a lead A; one end 1B of the second high-frequency isolating transformer T RB also leads a lead A to be connected to the lead A of the first high-frequency isolating transformer T RA The common bridge arm 330 is multiplexed with the first high frequency isolation transformer T RA , and the other end 2B is connected to the intermediate point of the second bridge arm 320 and leads a lead B.
第一子变换电路中的滤波电容Cr2a、谐振电容Cr1a、谐振电感Lra、高频开关管Q3A、高频开关管Q4A的参数与第二子变换电路的相同，第一高频隔离变压器TRA的原边的绕组与第二高频隔离变压器TRB的一致。The parameters of the filter capacitor Cr2a, the resonance capacitor Cr1a, the resonance inductor Lra, the high frequency switch transistor Q3A, and the high frequency switch transistor Q4A in the first sub-transformation circuit are the same as those of the second sub-transformation circuit, and the first high-frequency isolating transformer T RA The primary winding is identical to the second high frequency isolation transformer T RB .
第一直流侧110、第二直流侧120均为可提供或者可吸收能量的装置或者电路，其中一个作为输入，另一个则作为输出。第一直流侧110包括直流源V1和高压储能滤波电容C1，高压储能滤波电容C1的正负两端分别与直流源V1的正负两端连接。第二直流侧包括直流源V2和滤波电容C2，滤波电容C2的两端分别与直流源V2的两端连接。直流源V1和V2的形式包括直流电源、电池和交流整流变换后的电源。当然，高压储能滤波电容C1和滤波电容C2也可以纳入到第一子变换电路或者第二子变换电路中，本发明并不以此为限。The first DC side 110 and the second DC side 120 are both devices or circuits that provide or absorb energy, one of which acts as an input and the other as an output. The first DC side 110 includes a DC source V1 and a high voltage energy storage filter capacitor C1. The positive and negative ends of the high voltage energy storage filter capacitor C1 are respectively connected to the positive and negative ends of the DC source V1. The second DC side includes a DC source V2 and a filter capacitor C2, and two ends of the filter capacitor C2 are respectively connected to both ends of the DC source V2. The forms of the DC sources V1 and V2 include a DC power source, a battery, and an AC rectified power supply. Of course, the high-voltage energy storage filter capacitor C1 and the filter capacitor C2 may also be included in the first sub-transformation circuit or the second sub-conversion circuit, and the invention is not limited thereto.
控制器400的一端401输入采样信号，另一端402输出采样信号。参考图4，在变压器的原边，第一串联谐振逆变电路210与第二串联谐振逆变电路220是近似并联的关系，两者并联后与高压储能滤波电容C1的两端+BUS和-BUS连接，也即第一串联谐振逆变电路210与第二串联谐振逆变电路220并联后的两端与直流源V1连接。在变压器的副边，第一路整流电路的两端、第二路整流电路的两端均与滤波电容C2的两端连接，也即第一路整流电路的两端、第二路整流电路的两端均与直流源V2连接。One end 401 of the controller 400 inputs a sampling signal, and the other end 402 outputs a sampling signal. Referring to FIG. 4, at the primary side of the transformer, the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are in an approximately parallel relationship, and the two are connected in parallel with the two ends of the high voltage energy storage filter capacitor C1 + BUS and The -BUS connection, that is, both ends of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in parallel with the DC source V1. At the secondary side of the transformer, both ends of the first rectifier circuit and the second rectifier circuit are connected to both ends of the filter capacitor C2, that is, both ends of the first rectifier circuit and the second rectifier circuit. Both ends are connected to the DC source V2.
在直流源V1的一侧，第一子变换电路中的高频开关管Q3A和Q4A、第一滤波电容Cr2a、第一谐振电容Cr1a和第一谐振电感Lra与第二子变换电路中的相同，第一高频隔离变压器TRA和第二高频隔离变压器TRB的原边的绕组也一致。On one side of the DC source V1, the high frequency switching transistors Q3A and Q4A, the first filter capacitor Cr2a, the first resonant capacitor Cr1a, and the first resonant inductor Lra in the first sub-conversion circuit are the same as in the second sub-conversion circuit, The windings of the primary side of the first high frequency isolation transformer T RA and the second high frequency isolation transformer T RB are also identical.
参考图5，本发明的宽范围双向软开关直流变换电路采用如下控制方法：Referring to FIG. 5, the wide-range bidirectional soft-switching DC conversion circuit of the present invention adopts the following control method:
检测变换电路需要输出的电压以及检测变换电路需要正向还是反向 工作；正向工作是指第一直流侧110为输入，第二直流侧120为输出；反向工作是指第二直流侧120为输入，第一直流侧110为输出。由于存在第一、第二子变换电路，它们既可以单独输出，也可以同时联合输出，而且，第一直流侧110、第二直流侧120均为可提供或者可吸收能量的装置或者电路，那么就可以实现双向变换，可以满足不同场合的需求，因此需要确定第一、第二子变换电路如何工作。Detecting the voltage that the conversion circuit needs to output and whether the detection conversion circuit needs to be forward or reverse Working; forward operation means that the first DC side 110 is an input, and the second DC side 120 is an output; the reverse operation means that the second DC side 120 is an input, and the first DC side 110 is an output. Since the first and second sub-conversion circuits are present, they may be output separately or in combination, and the first DC side 110 and the second DC side 120 are devices or circuits that can provide or absorb energy. Then, the bidirectional transformation can be realized, which can meet the needs of different occasions, so it is necessary to determine how the first and second sub-transformation circuits work.
根据检测结果控制变换电路的工作状态，包括：若需要第一子变换电路或第二子变换电路输出电压，则控制第一子变换电路或第二子变换电路进入工作状态；若需要第一子变换电路和第二子变换电路的输出电压之和，则控制第一子变换电路和第二子变换电路均进入工作状态。也就是说，根据检测结果，由控制器400控制第一、第二子变换电路进行工作，包括哪一条子变换电路开通以及正向还是反向工作。Controlling the working state of the conversion circuit according to the detection result, comprising: if the first sub-transformation circuit or the second sub-conversion circuit is required to output a voltage, controlling the first sub-transformation circuit or the second sub-transformation circuit to enter a working state; The sum of the output voltages of the conversion circuit and the second sub-conversion circuit controls both the first sub-transformation circuit and the second sub-conversion circuit to enter an active state. That is, based on the detection result, the controller 400 controls the first and second sub-conversion circuits to operate, including which sub-transformation circuit is turned on and forward or reverse operation.
控制第一子变换电路进入工作状态包括：使第一串联谐振逆变电路210、第一高频隔离变压器TRA、共用桥臂330和第一桥臂310按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作。具体如下：Controlling the first sub-transformation circuit to enter an operating state includes: operating the first series resonant inverter circuit 210, the first high-frequency isolating transformer T RA , the shared bridge arm 330, and the first bridge arm 310 according to LLC conversion and synchronous full-bridge rectification The forward or reverse control turns on the timing to achieve forward or reverse operation. details as follows:
当需要第一高频隔离变压器TRA所在的变换电路正向或反向输出电压时，也即第一子变换电路正向或反向输出电压，控制器400正向或反向控制开通时序，发出信号，使第一子变换电路工作。第一高频隔离变压器TRA的原边是半桥LLC变换回路，副边由共用桥臂330和第一桥臂310形成同步全桥整流电路，此时第二桥臂320不工作。按照常规的半桥或全桥LLC变换及同步全桥整流的控制原理进行控制即可。When the conversion circuit of the first high frequency isolation transformer T RA is required to output the voltage in the forward or reverse direction, that is, the first sub conversion circuit outputs the voltage in the forward or reverse direction, the controller 400 controls the turn-on timing in the forward or reverse direction. A signal is sent to cause the first sub-conversion circuit to operate. The primary side of the first high frequency isolation transformer T RA is a half bridge LLC conversion circuit, and the secondary side is formed by the common bridge arm 330 and the first bridge arm 310 to form a synchronous full bridge rectifier circuit, at which time the second bridge arm 320 does not operate. It can be controlled according to the conventional half bridge or full bridge LLC conversion and synchronous full bridge rectification control principle.
控制第二子变换电路进入工作状态包括：使第二串联谐振逆变电路、第二高频隔离变压器、共用桥臂和第二桥臂按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作。具体如下：Controlling the second sub-transformation circuit to enter the working state comprises: operating the second series resonant inverter circuit, the second high-frequency isolation transformer, the shared bridge arm and the second bridge arm according to LLC conversion and synchronous full-bridge rectification, forward or reverse Turn on timing to control to work in forward or reverse direction. details as follows:
当需要第二高频隔离变压器TRB所在的变换电路正向或反向输出电压时，也即第二子变换电路正向或反向输出电压，控制器400正向或反向控制开通时序，发出信号，使第二子变换电路工作。第二高频隔离变压器TRB的原边是半桥LLC变换回路，副边由共用桥臂330和第二桥臂320形成同 步全桥整流电路，此时第一桥臂310不工作。按照常规的半桥或全桥LLC变换及同步全桥整流的控制原理进行控制即可。When the conversion circuit of the second high frequency isolation transformer T RB is required to output the forward or reverse voltage, that is, the second sub conversion circuit outputs the voltage in the forward or reverse direction, the controller 400 controls the turn-on timing in the forward or reverse direction. A signal is sent to cause the second sub-conversion circuit to operate. The primary side of the second high frequency isolation transformer T RB is a half bridge LLC conversion circuit, and the secondary side is formed by the common bridge arm 330 and the second bridge arm 320 to form a synchronous full bridge rectifier circuit, at which time the first bridge arm 310 does not operate. It can be controlled according to the conventional half bridge or full bridge LLC conversion and synchronous full bridge rectification control principle.
控制第一子变换电路和第二子变换电路均进入工作状态包括：Controlling both the first sub-transformation circuit and the second sub-transformation circuit to enter a working state includes:
变压器的原边形成LLC变换工作回路，控制共用桥臂330不工作，第一高频隔离变压器TRA的耦合电压和第二高频隔离变压器TRB的耦合电压在副边形成叠加关系；使变换电路中形成电流通路，从而实现正向工作。具体如下：The primary side of the transformer forms an LLC conversion working circuit, and the control common bridge arm 330 does not work. The coupling voltage of the first high frequency isolation transformer T RA and the coupling voltage of the second high frequency isolation transformer T RB form a superposition relationship on the secondary side; A current path is formed in the circuit to achieve forward operation. details as follows:
当需要第一子变换电路和第二子变换电路一起工作联合输出电压时，则通过控制器400控制第一子变换电路中的高频开关管Q3A、Q4A、Q9A、Q10A以及第二子变换电路的高频开关管Q3B、Q4B、Q9B、Q10B的通断，此时共用桥臂330中的高频开关管Q11A和Q12A不工作。When the first sub-conversion circuit and the second sub-conversion circuit are required to work together to output the combined output voltage, the high frequency switching transistors Q3A, Q4A, Q9A, Q10A and the second sub-conversion circuit in the first sub-conversion circuit are controlled by the controller 400. The high frequency switching tubes Q3B, Q4B, Q9B, and Q10B are turned on and off, and at this time, the high frequency switching tubes Q11A and Q12A in the shared bridge arm 330 do not operate.
控制时序参考图6，高频开关管Q3A和Q3B开通，或者高频开关管Q4A和Q4B开通，则在两个变压器的原边形成谐振半桥的工作回路；高频开关管Q3A和Q3B开通后，两个变压器的副边的耦合电压分别为VTa和VTb，根据同名端原理，上正下负，这两个电压会自然形成串联关系，共用桥臂330等同于不存在，因此，O引线端端为正，B引线端为负；当耦合电压VTa与耦合电压VTb之和大于直流源V2的电压或者使高频开关管Q9A和Q10B的二极管正偏时，电流通路形成，从而输出电压。同理，当高频开关管Q4A和Q4B开通后，两个变压器的副边的耦合电压分别为VTa和VTb，根据同名端原理，上负下正，这两个电压也会自然形成串联关系，共用桥臂330等同于不存在，因此，O引线端为负，B引线端为正；当耦合电压VTa与耦合电压VTb之和大于直流源V2的电压或者使高频开关管Q10A和Q9B的二极管正偏时，电流通路形成，从而输出电压。Control timing refers to Figure 6, when the high-frequency switch tubes Q3A and Q3B are turned on, or the high-frequency switch tubes Q4A and Q4B are turned on, the working circuit of the resonant half-bridge is formed on the primary side of the two transformers; after the high-frequency switch tubes Q3A and Q3B are turned on The coupling voltages of the secondary sides of the two transformers are VTa and VTb respectively. According to the principle of the same name, the upper and lower negative voltages will naturally form a series relationship, and the common bridge arm 330 is equivalent to non-existent. Therefore, the O-lead end The terminal is positive and the B lead terminal is negative; when the sum of the coupling voltage VTa and the coupling voltage VTb is greater than the voltage of the DC source V2 or the diodes of the high frequency switching transistors Q9A and Q10B are positively biased, a current path is formed, thereby outputting a voltage. Similarly, when the high-frequency switch tubes Q4A and Q4B are turned on, the coupling voltages of the secondary sides of the two transformers are VTa and VTb respectively. According to the principle of the same name, the upper and lower positive voltages will naturally form a series relationship. The common bridge arm 330 is equivalent to non-existent. Therefore, the O lead terminal is negative and the B lead terminal is positive; when the sum of the coupling voltage VTa and the coupling voltage VTb is greater than the voltage of the DC source V2 or the diode of the high frequency switching transistors Q10A and Q9B When positively biased, a current path is formed to output a voltage.
进一步地，控制第一子变换电路和第二子变换电路均进入工作状态，正向工作状态下：根据串联谐振逆变电路的工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个正向特定频率，如果正向特定频率大于谐振频率，则是降压特性；如果正向特定频率小于谐振频率，则是升压特性。具体的，如果是降压特性，则变压器副边的高频开关管Q9A和Q10B开通，或者是高频开关管Q10A和Q9B开通，参考图6，它们的开通时间会相对后移，关断时间会趋近于高频开关管Q3A或者Q3B，同时根据负载电流大小缩减开通的时间；如果是升压特性，参考图7，它 们的开通时间除了会相对后移之外，关断时间会朝中心偏移，使前后的关断时间趋近于对称。Further, the first sub-transformation circuit and the second sub-transformation circuit are controlled to enter a working state, and in the forward working state: according to the corresponding relationship between the operating frequency of the series resonant inverter circuit and the resonant frequency, and according to the needs of the output voltage After the operation, a positive specific frequency is output. If the forward specific frequency is greater than the resonant frequency, it is a step-down characteristic; if the forward specific frequency is smaller than the resonant frequency, it is a boosting characteristic. Specifically, if it is a step-down characteristic, the high frequency switching tubes Q9A and Q10B of the secondary side of the transformer are turned on, or the high frequency switching tubes Q10A and Q9B are turned on. Referring to FIG. 6, their turn-on times are relatively shifted back, and the turn-off time is turned off. Will approach the high-frequency switch Q3A or Q3B, and reduce the turn-on time according to the load current; if it is boost, refer to Figure 7, it In addition to their relative turn-on time, the turn-off time will shift towards the center, making the turn-off time before and after the symmetry close.
控制共用桥臂330不工作，第一桥臂310和第二桥臂320工作，第一高频隔离变压器TRA的副边的承受电压和第二高频隔离变压器TRB的副边的承受电压之和使电流通路形成，变压器的原边感应出电压；变压器的原边形成LLC变换工作回路，实现反向工作。具体如下：The control common bridge arm 330 does not work, the first bridge arm 310 and the second bridge arm 320 operate, the withstand voltage of the secondary side of the first high frequency isolation transformer T RA and the withstand voltage of the secondary side of the second high frequency isolation transformer T RB The sum makes the current path formed, and the primary side of the transformer induces a voltage; the primary side of the transformer forms an LLC conversion working circuit to achieve reverse operation. details as follows:
当需要第一子变换电路和第二子变换电路一起工作联合输出电压时，则通过控制器400控制第一子变换电路中的高频开关管Q3A、Q4A、Q9A、Q10A以及第二子变换电路的高频开关管Q3B、Q4B、Q9B、Q10B的通断，此时共用桥臂330中的高频开关管Q11A和Q12A不工作。When the first sub-conversion circuit and the second sub-conversion circuit are required to work together to output the combined output voltage, the high frequency switching transistors Q3A, Q4A, Q9A, Q10A and the second sub-conversion circuit in the first sub-conversion circuit are controlled by the controller 400. The high frequency switching tubes Q3B, Q4B, Q9B, and Q10B are turned on and off, and at this time, the high frequency switching tubes Q11A and Q12A in the shared bridge arm 330 do not operate.
控制时序参考图7，高频开关管Q9A和Q10B开通后，两个变压器的副边会根据等效阻抗自动分别承受电压VTa以及VTb，根据同名端原理，上正下负，共用桥臂330不开通等同于不存在，因此，O引线端为正，B引线端为负，即电压VTa与电压VTb之和近似等于直流源V2的电压，电流通路形成，此时两个变压器的原边线圈会感应出电压，由于两者为近似并联关系，因此其会对电压VTa及VTb串联分压有反向钳制作用。此时原边感应电压4A、4B端为正，5A、5B端为负，因此，当高频开关管Q3A和Q3B被正偏时，电流会输出至第一直流侧110，如果给高频开关管Q3A和Q3B施加驱动电压，则形成同步整流的关系；同理，高频开关管Q9B和Q10A开通后，两个变压器的副边分别承受电压VTa以及VTb，根据同名端原理，上负下正，原共用桥臂330不开通等同于不存在；因此，即O引线端为负，B引线端为正，电压VTa与电压VTb之和近似等于直流源V2的电压，电流通路形成，两个变压器的原边线圈会感应出电压，由于两者为近似并联关系，因此其会对电压VTa及VTb串联分压有反向钳制作用，此时原边感应电压5A、5B端为正，4A、4B端为负，因此，当高频开关管Q4A和Q4B被正偏时，电流会输出至第一直流侧110，如果给高频开关管Q4A和Q4B施加驱动电压，则形成同步整流的关系。Control timing Referring to Figure 7, after the high-frequency switch tubes Q9A and Q10B are turned on, the secondary sides of the two transformers will automatically withstand the voltages VTa and VTb according to the equivalent impedance respectively. According to the same-name end principle, the upper and lower sides are negative, and the shared bridge arm 330 is not Opening is equivalent to non-existence. Therefore, the O lead terminal is positive and the B lead terminal is negative, that is, the sum of the voltage VTa and the voltage VTb is approximately equal to the voltage of the DC source V2, and the current path is formed. At this time, the primary winding of the two transformers will be The induced voltage is due to the fact that the two are approximately parallel, so they have a reverse clamp for the voltage division of the voltages VTa and VTb. At this time, the primary side induced voltages 4A, 4B are positive, and the 5A and 5B terminals are negative. Therefore, when the high frequency switching transistors Q3A and Q3B are forward biased, the current is output to the first DC side 110, if high frequency is given When the driving voltage is applied to the switching tubes Q3A and Q3B, the synchronous rectification relationship is formed. Similarly, after the high frequency switching tubes Q9B and Q10A are turned on, the secondary sides of the two transformers are respectively subjected to the voltages VTa and VTb, according to the principle of the same name, Positive, the original shared bridge arm 330 is not open equivalent to no existence; therefore, the O lead end is negative, the B lead end is positive, the sum of the voltage VTa and the voltage VTb is approximately equal to the voltage of the DC source V2, the current path is formed, and two The primary coil of the transformer induces a voltage. Since the two are approximately parallel, they will have a reverse clamp for the voltage division of the voltage VTa and VTb. At this time, the primary induced voltages 5A and 5B are positive, 4A. The 4B terminal is negative. Therefore, when the high frequency switching transistors Q4A and Q4B are positively biased, the current is output to the first DC side 110. If a driving voltage is applied to the high frequency switching transistors Q4A and Q4B, a synchronous rectification relationship is formed. .
进一步地，控制第一子变换电路和第二子变换电路均进入工作状态，反向工作状态下：根据串联谐振逆变电路工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个反向特定频率，如果反向特定频率大于谐振频率，则是升压特性，如果反向特定频率小于谐振频率， 则是降压特性。如果是降压特性，变压器副边的高频开关管Q3A和Q3B，或者高频开关管Q4A和Q4B，会根据负载电流大小以及电压缩减开通的时间。Further, the first sub-transformation circuit and the second sub-transformation circuit are controlled to enter a working state, and in the reverse working state: according to the corresponding relationship between the operating frequency of the series resonant inverter circuit and the resonant frequency, and the control operation according to the requirement of the output voltage After outputting a reverse specific frequency, if the reverse specific frequency is greater than the resonant frequency, it is a boosting characteristic. If the reverse specific frequency is less than the resonant frequency, It is the buck characteristic. If it is a step-down characteristic, the high-frequency switch tubes Q3A and Q3B on the secondary side of the transformer, or the high-frequency switch tubes Q4A and Q4B, will be de-energized according to the magnitude of the load current and the electric compression.
根据上述可知，本发明避免了在变压器回路串联双向可通的高频开关带来的电路复杂性以及损耗，复用共用桥臂，使得电路简洁、控制简单，正向或反向控制开通时序以实现双向变换，提高性价比，不同电压段工作的时候效率高、可靠。通过控制，可使第一高频隔离变压器、第二高频隔离变压器所在的变换电路单独或者同时联合输出电压，可以输出不同电压，特别是联合输出电压时使输出电压得到叠加，可以满足宽范围的工作。此外，利用第一及第二串联谐振逆变电路的谐振模式可实现软开关，可降低逆变电路中各电子元件的开通及关断应力，从而降低开关损耗，有助于提高逆变电路的工作频率或者效率，进而减小体积或者提高功率密度。According to the above, the present invention avoids the circuit complexity and loss caused by the bidirectional high-frequency switch in the transformer circuit, and multiplexes the common bridge arm, so that the circuit is simple, the control is simple, and the turn-on timing is controlled in the forward or reverse direction. Achieve two-way transformation, improve cost performance, high efficiency and reliability when working in different voltage segments. Through the control, the conversion circuit of the first high-frequency isolation transformer and the second high-frequency isolation transformer can be combined with the output voltage separately or simultaneously, and different voltages can be output, especially when the output voltage is combined to superimpose the output voltage, which can satisfy a wide range. work. In addition, the resonant mode of the first and second series resonant inverter circuits can realize soft switching, which can reduce the opening and closing stress of each electronic component in the inverter circuit, thereby reducing switching loss and helping to improve the inverter circuit. Operating frequency or efficiency, which in turn reduces volume or increases power density.
以上对本发明进行了说明，但本发明还可以有一些变型的形式，比如：The present invention has been described above, but the present invention may also have some variants, such as:
参考图8，第一串联谐振逆变电路210和第二串联谐振逆变电路220的形式还可以是全桥式电路；逆变电路采用全桥式电路，在变换电路的输入电流相同、输入电压也相同的情况下，全桥式电路的原边电压为半桥式电路的两倍，那么功率全桥式电路的输出功率是半桥式电路的两倍，也即全桥式电路适合大功率输出；Referring to FIG. 8, the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 may also be in the form of a full bridge circuit; the inverter circuit adopts a full bridge circuit, and the input current of the conversion circuit is the same, and the input voltage is In the same case, the primary side voltage of the full bridge circuit is twice that of the half bridge circuit, then the output power of the power full bridge circuit is twice that of the half bridge circuit, that is, the full bridge circuit is suitable for high power. Output
如果需要更宽的输出电压，则再增加一路子变换电路，对应变压器的两根引线为B和C，共用原第二桥臂320，新增与引线C连接的变换桥臂即可。If a wider output voltage is required, then a sub-transformer circuit is added, the two leads of the corresponding transformer are B and C, the original second bridge arm 320 is shared, and a conversion bridge arm connected to the lead C is added.
本发明还提供一种电能变换装置，包括信号处理器、存储器和一个或多个程序，一个或多个程序被存储在存储器中，并且被配置成由信号处理器执行，程序包括用于执行上述方法的指令。The present invention also provides an electrical energy conversion apparatus comprising a signal processor, a memory and one or more programs, the one or more programs being stored in the memory and configured to be executed by a signal processor, the program comprising Method of instruction.
以上内容是结合具体/优选的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，其还可以对这些已描述的实施方式做出若干替代或变型，而这些替代或变型方式都应当视为属于本发明的保护范围。 The above is a further detailed description of the present invention in combination with specific/preferred embodiments, and it is not intended that the specific embodiments of the invention are limited to the description. It will be apparent to those skilled in the art that <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; It belongs to the scope of protection of the present invention.

Claims (10)

  1. 一种宽范围双向软开关直流变换电路，其特征在于：包括至少一个第一子变换电路、至少一个第二子变换电路和至少一个控制器；所述第一子变换电路包括第一串联谐振逆变电路、第一高频隔离变压器、共用桥臂和第一桥臂；所述第二子变换电路包括第二串联谐振逆变电路、第二高频隔离变压器和第二桥臂；第一及第二串联谐振逆变电路的一侧用于与第一直流侧连接，第一及第二串联谐振逆变电路的另一侧分别与第一及第二高频隔离变压器的原边的两端连接；所述控制器用于控制所述第一及第二串联谐振逆变电路、所述共用桥臂、所述第一桥臂和所述第二桥臂；所述第一高频隔离变压器的副边的一端与所述第一桥臂的中间点连接，另一端与所述共用桥臂的中间点连接；所述第二高频隔离变压器的副边的一端与所述共用桥臂的中间点连接，另一端与所述第二桥臂的中间点连接；所述共用桥臂的两端与所述第一桥臂的两端分别连接形成第一路整流电路；所述共用桥臂的两端与所述第二桥臂的两端分别连接形成第二路整流电路；所述第一路整流电路的两端、所述第二路整流电路的两端用于与第二直流侧连接；所述控制器根据变换电路需要输出的电压以及需要正向还是反向工作，正向或反向控制开通时序以及控制所述共用桥臂的通断使所述第一子变换电路、所述第二子变换电路正向或反向单独或者联合输出电压以实现宽范围双向变换。A wide-range bidirectional soft-switching DC conversion circuit, comprising: at least one first sub-conversion circuit, at least one second sub-conversion circuit, and at least one controller; the first sub-conversion circuit including a first series resonance inverse a variable circuit, a first high frequency isolation transformer, a common bridge arm and a first bridge arm; the second sub conversion circuit includes a second series resonant inverter circuit, a second high frequency isolation transformer and a second bridge arm; One side of the second series resonant inverter circuit is connected to the first DC side, and the other side of the first and second series resonant inverter circuits are respectively opposite to the primary sides of the first and second high frequency isolation transformers End connection; the controller is configured to control the first and second series resonant inverter circuits, the common bridge arm, the first bridge arm and the second bridge arm; the first high frequency isolation transformer One end of the secondary side is connected to an intermediate point of the first bridge arm, and the other end is connected to an intermediate point of the common bridge arm; one end of the secondary side of the second high frequency isolation transformer is opposite to the common bridge arm Intermediate point connection, the other end is The intermediate point of the second bridge arm is connected; the two ends of the common bridge arm are respectively connected with the two ends of the first bridge arm to form a first way rectifier circuit; the two ends of the common bridge arm and the second The two ends of the bridge arm are respectively connected to form a second circuit rectifier circuit; two ends of the first circuit rectifier circuit and two ends of the second circuit rectifier circuit are connected to the second DC side; The circuit needs to output the voltage and whether it needs to work in forward or reverse direction, the forward or reverse control of the turn-on timing and the control of the on and off of the shared bridge arm to make the first sub-transform circuit and the second sub-converter circuit forward Or output the voltage separately or in combination to achieve a wide range of bidirectional transformation.
  2. 根据权利要求1所述的宽范围双向软开关直流变换电路，其特征在于：The wide-range bidirectional soft-switching DC conversion circuit according to claim 1, wherein:
    第一串联谐振逆变电路包括两个高频开关管Q3A和Q4A、第一驱动电路、第一滤波电容、第一谐振电容和第一谐振电感，所述高频开关管Q3A的源极连接所述高频开关管Q4A的漏极，所述第一谐振电容的一端与所述第一滤波电容的一端连接，所述高频开关管Q3A的漏极与所述第一滤波电容的另一端连接，所述高频开关管Q4A的源极与所述第一谐振电容的另一端连接，第一高频隔离变压器的一个输入端通过所述第一谐振电感连接到所述高频开关管Q3A与所述高频开关管Q4A的中间点，所述第一高频隔离变压器的另一个输入端与所述第一谐振电容和所述第一滤波电容的中间点连接，所述第一驱动电路与所述高频开关管Q3A和所述高频开关管Q4A连接； The first series resonant inverter circuit includes two high frequency switching tubes Q3A and Q4A, a first driving circuit, a first filtering capacitor, a first resonant capacitor and a first resonant inductor, and a source connection of the high frequency switching transistor Q3A a drain of the high frequency switch transistor Q4A, one end of the first resonant capacitor is connected to one end of the first filter capacitor, and the drain of the high frequency switch transistor Q3A is connected to the other end of the first filter capacitor a source of the high frequency switching transistor Q4A is connected to the other end of the first resonant capacitor, and an input end of the first high frequency isolation transformer is connected to the high frequency switching transistor Q3A through the first resonant inductor An intermediate point of the high frequency switching transistor Q4A, another input end of the first high frequency isolation transformer is connected to an intermediate point of the first resonant capacitor and the first filter capacitor, the first driving circuit and The high frequency switch tube Q3A and the high frequency switch tube Q4A are connected;
    第二串联谐振逆变电路包括两个高频开关管Q3B、Q4B、第二驱动电路、第二滤波电容、第二谐振电容和第二谐振电感，所述高频开关管Q3B的源极连接所述高频开关管Q4B的漏极，所述第二谐振电容的一端与所述第二滤波电容的一端连接，所述高频开关管Q3B的漏极与所述第二滤波电容的另一端连接，所述高频开关管Q4B的源极与所述第二谐振电容的另一端连接，第二高频隔离变压器的一个输入端通过所述第二谐振电感连接到所述高频开关管Q3B与所述高频开关管Q4B的中间点，所述第二高频隔离变压器的另一个输入端与所述第二谐振电容和所述第二滤波电容的中间点连接，所述第二驱动电路与所述高频开关管Q3B和所述高频开关管Q4B连接；The second series resonant inverter circuit includes two high frequency switching tubes Q3B, Q4B, a second driving circuit, a second filtering capacitor, a second resonant capacitor and a second resonant inductor, and a source connection of the high frequency switching transistor Q3B a drain of the high frequency switch transistor Q4B, one end of the second resonant capacitor is connected to one end of the second filter capacitor, and the drain of the high frequency switch transistor Q3B is connected to the other end of the second filter capacitor a source of the high frequency switching transistor Q4B is connected to the other end of the second resonant capacitor, and an input end of the second high frequency isolation transformer is connected to the high frequency switching transistor Q3B through the second resonant inductor An intermediate point of the high frequency switching transistor Q4B, and another input end of the second high frequency isolation transformer is connected to an intermediate point of the second resonant capacitor and the second filter capacitor, the second driving circuit and The high frequency switch tube Q3B is connected to the high frequency switch tube Q4B;
    所述共用桥臂包括两个高频开关管Q11A和Q12A，所述高频开关管Q12A的漏极与所述高频开关管Q11A的源极连接；The common bridge arm includes two high frequency switching tubes Q11A and Q12A, and a drain of the high frequency switching tube Q12A is connected to a source of the high frequency switching tube Q11A;
    所述第一桥臂包括两个高频开关管Q9A和Q10A，所述高频开关管Q10A的漏极与所述高频开关管Q9A的源极连接；The first bridge arm includes two high frequency switching tubes Q9A and Q10A, and the drain of the high frequency switching tube Q10A is connected to the source of the high frequency switching tube Q9A;
    所述第二桥臂包括两个高频开关管Q9B和Q10B，所述高频开关管Q10B的漏极与所述高频开关管Q9B的源极连接。The second bridge arm includes two high frequency switching tubes Q9B and Q10B, and the drain of the high frequency switching tube Q10B is connected to the source of the high frequency switching tube Q9B.
  3. 根据权利要求1所述的宽范围双向软开关直流变换电路，其特征在于：所述第一及第二串联谐振逆变电路的形式包括半桥式电路和全桥式电路。The wide-range bidirectional soft-switching DC conversion circuit according to claim 1, wherein the first and second series resonant inverter circuits are in the form of a half bridge circuit and a full bridge circuit.
  4. 根据权利要求1至3任一项所述的宽范围双向软开关直流变换电路，其特征在于：所述第一直流侧、所述第二直流侧均为可提供或者可吸收能量的装置或者电路。The wide-range bidirectional soft-switching DC conversion circuit according to any one of claims 1 to 3, wherein the first DC side and the second DC side are both devices that can provide or absorb energy or Circuit.
  5. 一种宽范围双向软开关直流变换电路的控制方法，其特征在于包括如下步骤：A method for controlling a wide-range bidirectional soft-switching DC conversion circuit, comprising the steps of:
    检测变换电路需要输出的电压以及检测变换电路需要正向还是反向工作；所述正向工作是指第一直流侧为输入，第二直流侧为输出；所述反向工作是指第二直流侧为输入，第一直流侧为输出；The detection conversion circuit needs to output the voltage and the detection conversion circuit needs to work in the forward or reverse direction; the forward operation means that the first DC side is the input, the second DC side is the output; the reverse operation refers to the second The DC side is an input, and the first DC side is an output;
    根据检测结果控制变换电路的工作状态，包括：若需要第一子变换电路或第二子变换电路输出电压，则控制第一子变换电路或第二子变换电路进入工作状态；若需要第一子变换电路和第二子变换电路的输出电压之和，则控制第一子变换电路和第二子变换电路均进入工作状态；Controlling the working state of the conversion circuit according to the detection result, comprising: if the first sub-transformation circuit or the second sub-conversion circuit is required to output a voltage, controlling the first sub-transformation circuit or the second sub-transformation circuit to enter a working state; The sum of the output voltages of the conversion circuit and the second sub-transformation circuit controls the first sub-transformation circuit and the second sub-transformation circuit to enter an active state;
    所述控制第一子变换电路进入工作状态包括：使第一串联谐振逆变电路、第一高频隔离变压器、共用桥臂和第一桥臂按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作； The controlling the first sub-transformation circuit to enter an operating state comprises: operating the first series resonant inverter circuit, the first high-frequency isolating transformer, the shared bridge arm, and the first bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
    所述控制第二子变换电路进入工作状态包括：使第二串联谐振逆变电路、第二高频隔离变压器、共用桥臂和第二桥臂按照LLC变换以及同步全桥整流进行工作，正向或反向控制开通时序以实现正向或反向工作；The controlling the second sub-transformation circuit to enter an operating state comprises: operating the second series resonant inverter circuit, the second high-frequency isolating transformer, the shared bridge arm, and the second bridge arm according to LLC conversion and synchronous full-bridge rectification, and Or reverse control turn-on timing to achieve forward or reverse operation;
    所述控制第一子变换电路和第二子变换电路均进入工作状态包括：The controlling the first sub-transformation circuit and the second sub-transformation circuit to enter an active state includes:
    变压器的原边形成LLC变换工作回路，控制共用桥臂不工作，第一高频隔离变压器的耦合电压和第二高频隔离变压器的耦合电压在副边形成叠加关系；使变换电路中形成电流通路，从而实现正向工作；The primary side of the transformer forms an LLC conversion working circuit, and the control common bridge arm does not work. The coupling voltage of the first high-frequency isolation transformer and the coupling voltage of the second high-frequency isolation transformer form a superposition relationship on the secondary side; forming a current path in the conversion circuit To achieve positive work;
    控制共用桥臂不工作，第一桥臂和第二桥臂工作，第一高频隔离变压器的副边的承受电压和第二高频隔离变压器的副边的承受电压之和使电流通路形成，变压器的原边感应出电压；变压器的原边形成LLC变换工作回路，实现反向工作。The control common bridge arm does not work, the first bridge arm and the second bridge arm work, the sum of the withstand voltage of the secondary side of the first high frequency isolation transformer and the withstand voltage of the secondary side of the second high frequency isolation transformer form a current path, The primary side of the transformer induces a voltage; the primary side of the transformer forms an LLC conversion working circuit to achieve reverse operation.
  6. 根据权利要求5所述的控制方法，其特征在于控制第一子变换电路和第二子变换电路均进入工作状态，正向工作状态下：根据串联谐振逆变电路的工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个正向特定频率，如果正向特定频率大于谐振频率，则是降压特性；如果正向特定频率小于谐振频率，则是升压特性。The control method according to claim 5, characterized in that both the first sub-transformation circuit and the second sub-conversion circuit are controlled to enter an active state, and in the forward working state: according to the correspondence between the operating frequency of the series resonant inverter circuit and the resonant frequency The relationship, and the output of a forward specific frequency according to the need of the output voltage, if the forward specific frequency is greater than the resonant frequency, is the buck characteristic; if the forward specific frequency is less than the resonant frequency, it is the boosting characteristic.
  7. 根据权利要求5所述的控制方法，其特征在于控制第一子变换电路和第二子变换电路均进入工作状态，反向工作状态下：根据串联谐振逆变电路工作频率与谐振频率的对应关系，以及根据输出电压的需要经控制运算后输出一个反向特定频率，如果反向特定频率大于谐振频率，则是升压特性，如果反向特定频率小于谐振频率，则是降压特性。The control method according to claim 5, wherein the first sub-transformation circuit and the second sub-conversion circuit are both controlled to enter a working state, and in the reverse working state: according to the correspondence between the operating frequency of the series resonant inverter circuit and the resonant frequency And outputting an inverse specific frequency after the control operation according to the output voltage requirement. If the reverse specific frequency is greater than the resonance frequency, it is a boost characteristic, and if the reverse specific frequency is smaller than the resonance frequency, it is a step-down characteristic.
  8. 根据权利要求5或7所述的控制方法，其特征在于：第一串联谐振逆变电路包括两个高频开关管Q3A和Q4A,所述高频开关管Q3A的源极连接所述高频开关管Q4A的漏极；第二串联谐振逆变电路包括两个高频开关管Q3B和Q4B，所述高频开关管Q3B的源极连接所述高频开关管Q4B的漏极；反向工作状态下：The control method according to claim 5 or 7, wherein the first series resonant inverter circuit comprises two high frequency switching tubes Q3A and Q4A, and the source of the high frequency switching tube Q3A is connected to the high frequency switch The drain of the tube Q4A; the second series resonant inverter circuit includes two high frequency switching tubes Q3B and Q4B, the source of the high frequency switching tube Q3B is connected to the drain of the high frequency switching tube Q4B; under:
    所述高频开关管Q3A和所述高频开关管Q3B被正偏时，向所述高频开关管Q3A和所述高频开关管Q3B施加驱动电压以形成同步整流。When the high frequency switching transistor Q3A and the high frequency switching transistor Q3B are forwardly biased, a driving voltage is applied to the high frequency switching transistor Q3A and the high frequency switching transistor Q3B to form synchronous rectification.
  9. 根据权利要求8所述的控制方法，其特征在于：所述高频开关管(Q4A)和所述高频开关管Q4B被正偏时，向所述高频开关管Q4A和所述高频开关管Q4B施加驱动电压以形成同步整流。The control method according to claim 8, wherein when said high frequency switch tube (Q4A) and said high frequency switch tube Q4B are forwardly biased, said high frequency switch tube Q4A and said high frequency switch The tube Q4B applies a driving voltage to form synchronous rectification.
  10. 一种电能变换装置，包括信号处理器、存储器和一个或多个程序，所述一个或多个程序被存储在所述存储器中，并且被配置成由所述信号处 理器执行，所述程序包括用于执行如权利要求5-9任一项所述的方法的指令。 A power conversion device includes a signal processor, a memory, and one or more programs, the one or more programs being stored in the memory and configured to be The processor executes, the program comprising instructions for performing the method of any of claims 5-9.
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