WO2019033603A1 - Wide-range soft-switch direct-current conversion circuit and control method therefor - Google Patents

Wide-range soft-switch direct-current conversion circuit and control method therefor Download PDF

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Publication number
WO2019033603A1
WO2019033603A1 PCT/CN2017/112380 CN2017112380W WO2019033603A1 WO 2019033603 A1 WO2019033603 A1 WO 2019033603A1 CN 2017112380 W CN2017112380 W CN 2017112380W WO 2019033603 A1 WO2019033603 A1 WO 2019033603A1
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Prior art keywords
high frequency
circuit
series resonant
resonant inverter
inverter circuit
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PCT/CN2017/112380
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French (fr)
Chinese (zh)
Inventor
李伦全
刘嘉键
燕沙
郑车晓
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深圳市保益新能电气有限公司
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Publication of WO2019033603A1 publication Critical patent/WO2019033603A1/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33569Conversion 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 several active switching elements
    • H02M3/33576Conversion 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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592Conversion 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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815Resonant converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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 switching power supply, in particular to a wide range soft switching DC conversion circuit and a control method thereof.
  • the object of the present invention is to solve the problem of narrow output voltage range in the prior art, and to provide a wide-range soft-switching DC conversion circuit and a control method thereof.
  • the present invention adopts the following technical solutions:
  • a wide range soft switching DC conversion circuit comprising first and second series resonant inverter circuits, first and second high frequency isolation transformers, rectifier circuit and controller; said first and second series resonant inverter circuits The input ends are connected to the DC source, and the two output ends of the first and second series resonant inverter circuits are respectively connected to the two ends of the primary sides of the first and second high frequency isolation transformers, the first And connecting the secondary side of the second high frequency isolation transformer to the rectifier circuit, and the controller inputs a control signal to the first and second series resonant inverter circuits, and two output ends of the rectifier circuit
  • the controller is connected to the load; the controller determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, thereby controlling the turn-on timing of the series resonant inverter circuit to make the first series connection
  • the resonant inverter circuit and the second series resonant inverter circuit operate
  • the number of turns of the primary side of the first high frequency isolation transformer is the same as the number of turns of the primary side of the second high frequency isolation transformer, and the coil of the secondary side of the first high frequency isolation transformer
  • the ratio of the number of turns to the number of turns of the secondary side of the second high frequency isolation transformer ranges from 0.5 to 2.
  • the first series resonant inverter circuit includes two high frequency switching tubes (Q3A, Q4A), a first driving circuit, a first filtering capacitor, a first resonant capacitor, and a first resonant inductor, a source of the high frequency switch tube (Q3A) is connected to a drain of the high frequency switch tube (Q4A), and one end of the first resonant capacitor is connected to one end of the first filter capacitor, and the high frequency switch tube ( a drain of Q3A) is connected to the other end of the first filter capacitor, a source of the high frequency switch transistor (Q4A) is connected to the other end of the first resonant capacitor, and an output of the first high frequency isolation transformer The end is connected to the intermediate point of the high frequency switch tube (Q3A) and the high frequency switch tube (Q4A) through the first resonant inductor, and the other output end of the first high frequency isolation transformer is opposite to the first a resonant capacitor is connected to an intermediate
  • 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 the high frequency switching tube (Q3B) a source is connected to the drain of the high frequency switch tube (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 tube (Q3B) is The other end of the second filter capacitor is connected, the source of the high frequency switch tube (Q4B) is connected to the other end of the second resonant capacitor, and an output end of the second high frequency isolation transformer passes through the second resonant inductor Connected to an intermediate point between the high frequency switch tube (Q3B) and the high frequency switch tube (Q4B), another output end of the second high frequency isolation transformer and the second resonant capacitor and the second An intermediate point of the filter capacitor is connected, and the second driving circuit is connected to
  • the first series resonant inverter circuit is connected in parallel with the second series resonant inverter circuit; or the first series resonant inverter circuit is connected in series with the second series resonant inverter circuit.
  • the number of the first series resonant inverter circuit, the second series resonant inverter circuit, the first high frequency isolation transformer, and the second high frequency isolation transformer are all at least one; and the rectifier circuit is rectified
  • the component is a high frequency rectifying diode or a high frequency switching tube having an antiparallel diode; the first and second series resonant inverter circuits comprise a half bridge circuit and a full bridge circuit; and the rectifying circuit of the rectifying circuit Including double voltage rectification and full bridge rectification; the form of DC source includes DC power supply, battery and AC rectified power supply.
  • the present invention provides a control side of a wide range soft switching DC conversion circuit law:
  • a control method for a wide-range soft-switching DC conversion circuit which superimposes the secondary voltage of the first high-frequency isolating transformer and the secondary voltage of the second high-frequency isolating transformer, and includes the following steps:
  • Judging the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit if the actual ratio is high, controlling the turn-on timing of the series resonant inverter circuit to make the first series resonant inverter circuit The second series resonant inverter circuit operates in a wrong phase mode; if the actual ratio is low, controlling the turn-on timing of the series resonant inverter circuit causes the first series resonant inverter circuit and the second series resonant inverter circuit to operate in the same phase mode;
  • the inverter circuit operates in the wrong phase mode or the in-phase mode to lower or increase the voltage of the superimposed side, thereby widening the range of the output DC voltage.
  • the operating frequencies of the first and second series resonant inverter circuits are varied while controlling the turn-on timing of the first and second series resonant inverter circuits to further increase or decrease the output voltage.
  • the rectifying element of the rectifying circuit is a high frequency rectifying diode or a high frequency switching tube with an antiparallel diode. If it is a high frequency switching tube: according to the real-time voltage of the direct current source and the magnitude of the released current, the first The frequency of the first and second series resonant inverter circuits and the rectifier circuit increases or decreases the output voltage.
  • the rectifying element of the rectifying circuit when the rectifying element of the rectifying circuit is a high frequency switching tube, the turn-on timing of the rectifying circuit is offset based on the center of the turn-on timing of the series resonant inverter circuit, and a dead zone is left and front;
  • the release current of the source is less than the set current.
  • the rectifier component of the rectifier circuit is a high frequency switch, the high frequency switch tube is not turned on, and the rectifier circuit operates in a diode rectification state; if the release current of the DC source is above a set current, The high frequency switch tube in the rectifier circuit is turned on, and the rectifier circuit operates in the rectification state of the synchronous tube.
  • the release current of the DC source is less than the set current, and the rectifier component of the rectifier circuit is a high frequency switch transistor, the high frequency switch transistor is not turned on, and the rectifier circuit operates in a diode rectified state;
  • the release current of the source is above the set current, the high frequency switch tube in the rectifier circuit is turned on, and the rectifier circuit operates in the rectification state of the synchronous tube.
  • the rectifying element of the rectifying circuit is a high frequency switching tube
  • the direct current source is a device or circuit that can provide or absorb energy
  • the load is a device or circuit capable of storing and releasing electric energy, positive or Reversely controlling the turn-on timing of the first and second series resonant inverter circuits and the turn-on timing of the rectifier circuit can realize bidirectional flow of energy between the DC source and the load.
  • the present invention also provides an electrical energy conversion device:
  • 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 the signal processor, the program comprising An instruction to perform any of the above methods.
  • the controller Determining the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, and controlling the turn-on timing of the first series resonant inverter circuit and the second series resonant inverter circuit by the controller, so that The first series resonant inverter circuit and the second series resonant inverter circuit operate in a synchronous or misphase mode, thereby changing the phase, instantaneous voltage or polarity of the secondary voltage of the first high frequency isolation transformer and the second high frequency isolation transformer One or more of them. Since the secondary sides of the two transformers are connected in series, their secondary voltages are superimposed and add, suppress or cancel each other, so that lower input voltages can achieve higher or lower output voltages. The higher input voltage can achieve a lower or higher output voltage, so that the present invention can not only adapt to a wide input voltage range, but also has a wider output voltage range, which improves the applicability of the present invention.
  • 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 present invention also has the following beneficial effects:
  • the first and second series resonant inverter circuits are both series resonant topologies, when the operating frequency of the inverter circuit is a resonant frequency, the maximum output voltage is obtained at the secondary side of the high frequency isolation transformer, and thus, is changed. By changing the operating frequency of the inverter circuit at the same time, the output voltage can be further increased or decreased, thereby further improving the applicability of the present invention.
  • the rectifying element of the rectifying circuit is a high frequency switching tube having an antiparallel diode
  • synchronous rectification can be realized, and by controlling the turn-on timing of the rectifying circuit and the inverter circuit, the DC voltage of the output terminal can be reversely converted;
  • the turn-on timing of the inverter circuit changing the operating frequency of the inverter circuit and the rectifier circuit according to the real-time voltage of the DC source and the magnitude of the release current, the output voltage can be increased or decreased, and the output voltage is further broadened.
  • the number of turns of the primary side of the first high-frequency isolating transformer is the same as the number of turns of the primary side of the second high-frequency isolating transformer, and the ratio of the turns of the secondary side of the first high-frequency isolating transformer is 0.5 to 2, which can be realized. Optimal power transfer and increased utilization.
  • the DC source is a device or circuit that can provide or absorb energy
  • the load is a device or circuit capable of storing energy
  • the turn-on timing of the first and second series resonant inverter circuits and the turn-on timing of the rectifier circuit are controlled by reversely controlling
  • the power supply on the secondary side of the transformer can be sent back to the DC source.
  • FIG. 1 is a schematic diagram showing the circuit structure of a conversion circuit of the present invention
  • 3 is a timing chart of control of the conversion circuit of the present invention operating in the same phase mode
  • Figure 5 is a variant of the conversion circuit of Figure 1;
  • Figure 6 is another variation of the conversion circuit of Figure 1;
  • Figure 7 is still another variation of the conversion circuit of Figure 1;
  • FIG. 8 is a schematic structural diagram of a circuit according to another embodiment of the present invention.
  • FIG. 9 is a flow chart of a control method according to still another embodiment of the present invention.
  • the wide range soft switching DC conversion circuit of the present invention includes first and second series resonant inverter circuits 210 and 220, first and second high frequency isolation transformers T RA and T RB , rectifier circuit 300 and controller 400; the input ends of the first and second series resonant inverter circuits 210 and 220 are connected to the DC side 100; the DC side 100 provides DC power to the first and second series resonant inverter circuits 210 and 220; the first series resonance inverse
  • the two output ends of the variable circuit 210 are connected to both ends of the primary side of the first high frequency isolation transformer T RA , and the two outputs of the second series resonant inverter circuit 220 and the primary side of the second high frequency isolation transformer T RB
  • the two ends of the first and second high-frequency isolating transformers T RA and T RB are connected in series with the access rectifier circuit 300, and the controller 400 inputs the control to the first and second series resonant inverter circuits 210 and 2
  • the signal, the two output ends of the rectifier circuit 300 are connected to the load V2; the controller 400 determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the converter circuit, thereby controlling the series resonant inverter Circuit
  • the turn-on timing causes the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 to operate in a wrong phase mode or an in-phase mode.
  • 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 The first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both half bridge circuits, the rectification mode of the rectifier circuit 300 is voltage doubler rectification, and the rectifying elements of the rectifier circuit 300 are provided with reverse parallel connection.
  • the DC side 100 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 first series resonant inverter circuit 210 includes two high The frequency switching tubes Q3A and Q4A, the first driving circuit 211, the first filter capacitor Cr2a, the first resonant capacitor Cr1a and the first resonant inductor Lra, the source of the high frequency switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A, One end of a resonant capacitor Cr1a is connected to one end of the first filter capacitor Cr2a, the drain of the high frequency switch transistor Q3A is connected to the other end of the first filter capacitor Cr2a, and the source of the high frequency switch transistor Q4A is connected to the first resonant capacitor Cr1a.
  • an output terminal 4A of the first high-frequency isolating transformer T RA is connected to an intermediate point between the high-frequency switch tube Q3A and the high-frequency switch tube Q4A through the first resonant inductor Lra, and the other of the first high-frequency isolating transformer T RA
  • An output terminal 5A is connected to an intermediate point of the first resonant capacitor Cr1a and the first filter capacitor Cr2a, and the first driving circuit 211 is connected to the high frequency switching transistor Q3A and the high frequency switching transistor Q4A, and the first driving circuit 211 is a high frequency switching transistor.
  • the second series resonant inverter circuit 220 includes two high frequency switching transistors 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 switch
  • the source of the tube Q3B is connected to the drain of the high frequency switch tube 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 tube Q3B is connected to the other end of the second filter capacitor Cr2b.
  • the source of the high frequency switching transistor Q4B is connected to the other end of the second resonant capacitor Cr1b, and one output terminal 4B of the second high frequency isolation transformer T RB is connected to the high frequency switching transistor Q3B and the high frequency switch through the second resonant inductor Lrb.
  • the intermediate point of the tube Q4B, the other output end 5B of the second high-frequency isolation transformer T RB is connected to the 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 are high.
  • the frequency switch tube Q4B is connected, the second driving circuit 221 provides a driving signal for the high frequency switching tube Q3B and the high frequency switching tube Q4B; the controller 400 is connected to the first driving circuit 211 and the second driving circuit 221, respectively to the first driving circuit 211 and Second driving circuit 221 transmits a control signal; secondary side of the transformer, a first high frequency isolation transformer T RA of the end 2A of the secondary side connected to one end of a second secondary 1B high frequency isolation transformer T RB; a rectifying circuit 300 includes a high Frequency switch tubes Q1 and Q2, capacitors C4 and C5, filter capacitor C2 and third drive circuit 310, one end of capacitor C4 and one end of C5 are connected in series, and the source of high frequency switch tube Q1 is connected to the drain of high frequency switch tube Q2.
  • the drain of the high frequency switch Q1 is connected to the other end of the capacitor C4 and one end of the filter capacitor C2, and the source of the high frequency switch Q2 is connected to the other end of the capacitor C5 and the other end of the filter capacitor C2.
  • the other end 1A of the secondary side of the isolation transformer T RA is connected to the intermediate point of the capacitor C4 and the capacitor C5, and the other end 2B of the secondary side of the second high-frequency isolation transformer T RB is connected between the high-frequency switching tube Q1 and the high-frequency switching tube Q2.
  • one end of the third driving circuit 310 is connected to the controller 400, and the other ends of the third driving circuit 310 send driving signals to the high frequency switching tubes Q1 and Q2, and the load V2 is connected to both ends of the filtering capacitor C2.
  • the first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB are an isolating transformer with an air gap in the core or an isolating transformer with a resonant inductor connected in series or an isolating transformer with a storage inductor in the secondary side.
  • the size of the core air gap is determined by the ratio of the positive and the reverse excitation and the input and output parameters of the system.
  • the original and secondary coupling coefficients do not need to be specially set.
  • the magnetic core of the first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB have an air gap and a certain leakage inductance, so that the first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB can Both positive and negative.
  • the leakage inductance is obtained by a natural winding process, and at the same time, according to actual needs, a leakage feeling that can be large or small can be obtained by a change in the winding process.
  • an inductor can be applied to the secondary side.
  • the isolation transformer does not have to intentionally distinguish the end point connection points of the primary side and the secondary side, that is, the starting end of the isolation transformer is not considered.
  • the first series resonant inverter circuit 210 is connected in parallel with the second series resonant inverter circuit 220, and is connected to both ends of the high voltage energy storage filter capacitor C1 +BUS and -BUS, That is, the input end 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.
  • the secondary voltage of the first high-frequency isolating transformer T RA is superimposed with the secondary voltage of the second high-frequency isolating transformer T RB , and the following control is also adopted.
  • a predetermined voltage ratio generally, the actual output voltage of the conversion circuit cannot be higher than the voltage required by the load. Therefore, the actual output voltage is constrained by setting a predetermined voltage ratio; the controller 400 sets different predetermined voltage ratios according to different loads. ;
  • the controller 400 Collecting the input voltage; specifically, after the conversion circuit is operated, the controller 400 collects the input voltage V IN-TRA of the first high-frequency isolation transformer T RA and the input voltage V IN-TRB of the second high-frequency isolation transformer T RB ;
  • the inverter circuit operates in the wrong phase mode or the in-phase mode to lower or increase the voltage of the superimposed side, thereby widening the range of the output DC voltage; specifically, when the inverter circuit operates in the wrong phase mode, the secondary side of the transformer is superimposed. After the voltage is reduced, when the inverter circuit operates in the same phase mode, the voltage after the superposition of the secondary side of the transformer will increase.
  • the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both inverted by the high frequency switching tube, and the opening timing of the control inverter circuit is actually controlling the turn-on timing of the high frequency switching tube.
  • the high frequency switching tube of the first series resonant inverter circuit 210 and the high frequency switching tube of the second series resonant inverter circuit 220 are turned on at the same phase, and the secondary side of the first high frequency isolation transformer T RA
  • the phase of the voltage across the 1A and 2A is the same as the phase of the voltage across the secondary sides 1B and 2B of the second high-frequency isolating transformer T RB , the polarity is the same, the two secondary voltages are added, the rectifier circuit 300 operates, and the DC side 100
  • the energy is delivered to the load V2, and the output voltage can reach a maximum when the phases of the two inverter circuits are exactly the same.
  • the conversion circuit can implement a process of resonant transformation, and the inverter circuit is changed according to the condition of the load V2 in the full working range.
  • the working frequency or duty ratio can ensure that the high frequency switching tube in the inverter circuit obtains soft switching, reduces switching loss, effectively utilizes the advantages of the series resonant circuit, and achieves high efficiency conversion.
  • the set current can be specifically set to 0.1 times the rated current, and the switching tube in the rectifier circuit 300 is not turned on, and is rectified.
  • the circuit 300 operates in a diode rectified state, that is, the parasitic diode of the switch tube is naturally rectified; if the release current of the DC source V1 is above the set current, the high frequency switch tubes Q1 and Q2 receive the PWM drive signal, and the rectifier circuit 300 operates as a synchronous tube. Rectification state, related control timing Referring to FIG.
  • the turn-on timing of the rectifying circuit 300 is offset based on the center of the turn-on timing of the series resonant inverter circuit, and a dead zone is left and left.
  • the high frequency switching transistors Q1 and Q2 The turn-on timing is offset based on the center of the turn-on timing of the high-frequency switch transistors Q3 and Q4, respectively, and a certain dead time is left to prevent current over-current or short-circuit under the condition that the diode is not turned on, and the high-frequency switch tubes Q3 and Q4 There is also a certain dead time between them to prevent a through short circuit.
  • Wrong phase mode The controller 400 determines that the actual ratio is too high according to the predetermined voltage ratio. If the operation is in the same phase mode, the output voltage will be higher than the required voltage, or the modulation frequency and duty ratio cannot be used to achieve the drop. The voltage is controlled so that the controller 400 determines that the inverter circuit needs to operate in the wrong phase mode.
  • the high frequency switching tube of the first series resonant inverter circuit 210 and the high frequency switching tube of the second series resonant inverter circuit 220 are shifted by a certain phase, and the secondary side 1A of the first high frequency isolation transformer T RA
  • the phase of the voltage across the 2A and the voltage of the secondary side of the second high-frequency isolating transformer T RB will be the same as the voltage across the secondary side 1B and 2B, but the polarity may be opposite; or when the polarity is the same, since the resonance point voltage is not Similarly, the instantaneous voltage is different, so the secondary voltage of the first high-frequency isolating transformer T RA and the secondary voltage of the second high-frequency isolating transformer T RB are mutually suppressed or canceled, thereby showing that both are subject to The influence of the resonant phase point is no longer the original simple superposition, that is, the highest voltage point will be offset, and the output voltage of the conversion circuit will decrease accordingly.
  • the turn-on sequence of the rectifier circuit 300 is offset based on the center of the turn-on sequence of the series resonant inverter circuit, and a dead zone is left and right.
  • the high-frequency switch transistors Q3A and Q3B are turned off in phase.
  • the high frequency switching tubes Q4A and Q4B are turned off in phase, and the rest are similar to the in-phase mode.
  • a method is adopted to control the first series resonant inverter circuit 210 and the second series resonant inverter circuit while controlling the turn-on timing of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220
  • the operating frequency of 220 is to further increase or decrease the output voltage.
  • the present invention determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, and controls the first series resonant inverter circuit and the second series resonant inverter through the controller.
  • the turn-on timing of the circuit causes the first series resonant inverter circuit and the second series resonant inverter circuit to operate in a synchronous or misphase mode, thereby changing the phase of the secondary voltage of the first high frequency isolation transformer and the second high frequency isolation transformer One or more of instantaneous voltage or polarity.
  • the secondary sides of the two transformers are connected in series, their secondary voltages are superimposed and add, suppress or cancel each other, so that lower input voltages can achieve higher or lower output voltages.
  • the higher input voltage can achieve a lower or higher output voltage, so that the present invention can not only adapt to a wide input voltage range, but also has a wider output voltage range, which improves the applicability of the present invention.
  • the first and second series resonant inverter circuits are series resonant topologies, when the operating frequency of the inverter circuit is the resonant frequency, the maximum output voltage can be obtained at the secondary side of the high frequency isolation transformer, and therefore, the inverse is changed.
  • the output voltage can be further increased or decreased, thereby further improving the applicability of the present invention.
  • 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 rectifying element of the rectifying circuit is a high frequency switching tube, which can realize synchronous rectification, and can control the reverse timing of the DC voltage at the output end by controlling the turn-on timing of the rectifying circuit and the inverter circuit.
  • Fig. 1 of the present invention has been described above, but the present invention may also have some variants, such as:
  • the rectifying component of the rectifying circuit 300 may also be a high frequency rectifying diode, specifically including high frequency rectifying diodes D1 and D2, and the rectifying circuit 300 is rectified by double voltage rectification; similarly, the inverter circuit also has the same phase mode.
  • the wrong phase mode when the voltage of the secondary side of the transformer is superimposed and the conduction condition of the high frequency rectifier diode in the rectifier circuit 300 is satisfied, the rectifier circuit 300 is turned on. In the wrong phase mode, the superimposed voltage of the secondary side of the transformer is in a staggered period. Will become low, the rectifier circuit 300 will not conduct, and the output voltage will become low;
  • the rectification mode of the rectifying circuit 300 may also be full-bridge rectification, including four high-frequency rectifying diodes D1 to D4, wherein the high-frequency rectifying diodes D3 and D4 replace the capacitors C4 and C5, respectively; of course, four high frequencies
  • the rectifier diode can also be replaced by a high frequency switch tube with an antiparallel diode;
  • the form of the DC source V1 includes a DC power source, a battery, and an AC rectified power supply;
  • 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.
  • FIG. 8 shows another embodiment of the present invention.
  • the difference between this embodiment and the above embodiment is that when the DC side 100 is a high voltage input, the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in series. Connected to both ends of the high-voltage energy storage filter capacitor C1 +BUS and -BUS, that is, the input after the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in series The terminal is connected to the DC source V1.
  • This embodiment also has the advantageous effects of the above embodiments, in particular, the embodiment is suitable for the case where the input of the conversion circuit is a high voltage.
  • the basis of controlling the turn-on timing of the inverter circuit is determined by determining the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the converter circuit.
  • the frequency magnitudes of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 and the rectifier circuit 300 are also changed according to the real-time voltage of the DC source V1 and the magnitude of the release current.
  • changing the operating frequency of the inverter circuit and the rectifier circuit can increase or decrease the output voltage, thereby further broadening the range of the output voltage.
  • the rectifying element of the rectifying circuit 300 is a high frequency switching tube
  • the direct current source V1 is a circuit or device capable of providing energy, or a circuit or device capable of absorbing energy, such as a battery.
  • a DC bus or a PFC circuit capable of bidirectional conversion
  • the load V2 being a circuit or device capable of storing and releasing electrical energy, such as a battery; applying the first series resonant inverter circuit 210 and the second series resonant inverter circuit in a forward or reverse direction
  • the turn-on timing of 220 and the turn-on timing of rectifier circuit 300 The power supply on the secondary side of the transformer can be sent back to the DC source V1 to achieve bidirectional conversion.
  • the embodiment is different from the above embodiment in that the number of the first series resonant inverter circuit and the first high frequency isolation transformer are both two.
  • the secondary sides of the two first series resonant inverter circuits are connected in series and then connected in series with the secondary side of the second series resonant inverter circuit.
  • the present invention also provides a power 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 An instruction of any of the above methods.

Abstract

A wide-range soft-switch direct-current conversion circuit and a control method therefor. The circuit comprises first and second series resonance inversion circuits (210, 220), first and second high-frequency isolation transformers (TRA, TRB), a rectification circuit (300) and a controller (400). The input ends of the first and second series resonance inversion circuits (210, 220) are used for connecting to a direct-current source (V1); two output ends of the first and second series resonance inversion circuits (210, 220) are respectively connected to two ends of primary sides of the first and second high-frequency isolation transformers (TRA, TRB); secondary sides of the first and second high-frequency isolation transformers (TRA, TRB) are connected in series and are then connected to the rectification circuit (300); the controller (400) inputs control signals to the first and second series resonance inversion circuits (210, 220); and two output ends of the rectification circuit (300) are used for connecting to a load (V2). By means of the method, the inversion circuits (210, 220) can operate in an in-phase mode or in an anti-phase mode; and same can not only be adaptive to a wide input voltage range, but can also have a wider output voltage range.

Description

一种宽范围软开关直流变换电路及其控制方法Wide-range soft-switching DC conversion circuit and control method thereof 技术领域Technical field
本发明涉及直流开关电源,特别涉及一种宽范围软开关直流变换电路及其控制方法。The invention relates to a DC switching power supply, in particular to a wide range soft switching DC conversion circuit and a control method thereof.
背景技术Background technique
现有的备电应用场合,如UPS、车载电池等,需要将电池的储能进行变换和释放。由于宽范围电压变换的原因,传统的变换电路大多以硬开关管方案为主,或者使用较高电压等级的元器件以满足宽范围变换带来的电压应力,但其输出电压范围仍旧较窄,限制了其适用范围。Existing backup applications, such as UPS, car battery, etc., need to transform and release the battery's energy storage. Due to the wide range of voltage conversion, most of the traditional conversion circuits are mainly hard-switching schemes, or components with higher voltage levels are used to meet the voltage stress caused by wide-range conversion, but the output voltage range is still narrow. Limit its scope of application.
此外,还存在效率低下或者体积较大的问题,比如目前铁路的3.5KVA、110V逆变器电源产品,主流的产品效率大多在85%,即便使用了移相桥软开关等技术,效率也大多在88%,且体积较大。与相对较为成熟的逆变器技术相比,其关键问题就在DC/DC变换部分:没能很好的解决电池宽范围电压条件下的效率及功率密度的问题。In addition, there are problems of inefficiency or large volume. For example, the current 3.5KVA and 110V inverter power products of the railway, the mainstream product efficiency is mostly 85%, even if the phase shift bridge soft switch technology is used, the efficiency is mostly At 88%, and the volume is large. Compared with the relatively mature inverter technology, the key problem lies in the DC/DC conversion part: it fails to solve the problem of efficiency and power density under wide voltage range of the battery.
发明内容Summary of the invention
本发明的目的是为了解决现有技术输出电压范围较窄的问题,提出一种宽范围软开关直流变换电路及其控制方法。The object of the present invention is to solve the problem of narrow output voltage range in the prior art, and to provide a wide-range soft-switching DC conversion circuit and a control method thereof.
为解决上述技术问题,本发明采用以下技术方案:In order to solve the above technical problems, the present invention adopts the following technical solutions:
一种宽范围软开关直流变换电路,包括第一及第二串联谐振逆变电路、第一及第二高频隔离变压器、整流电路和控制器;所述第一及第二串联谐振逆变电路的输入端用于与直流源连接,所述第一及第二串联谐振逆变电路的两个输出端分别与第一及第二高频隔离变压器的原边的两端连接,所述第一及第二高频隔离变压器的副边串联后与接入所述整流电路,所述控制器向所述第一及第二串联谐振逆变电路输入控制信号,所述整流电路的两个输出端用于与负载连接;所述控制器根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低,从而控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于错相位模式或者同相位模式。 A wide range soft switching DC conversion circuit, comprising first and second series resonant inverter circuits, first and second high frequency isolation transformers, rectifier circuit and controller; said first and second series resonant inverter circuits The input ends are connected to the DC source, and the two output ends of the first and second series resonant inverter circuits are respectively connected to the two ends of the primary sides of the first and second high frequency isolation transformers, the first And connecting the secondary side of the second high frequency isolation transformer to the rectifier circuit, and the controller inputs a control signal to the first and second series resonant inverter circuits, and two output ends of the rectifier circuit The controller is connected to the load; the controller determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, thereby controlling the turn-on timing of the series resonant inverter circuit to make the first series connection The resonant inverter circuit and the second series resonant inverter circuit operate in a wrong phase mode or an in-phase mode.
在一些优选的实施方式中,第一高频隔离变压器的原边的线圈匝数与第二高频隔离变压器的原边的线圈匝数相同,所述第一高频隔离变压器的副边的线圈匝数与所述第二高频隔离变压器的副边的线圈匝数的比值范围为0.5至2。In some preferred embodiments, the number of turns of the primary side of the first high frequency isolation transformer is the same as the number of turns of the primary side of the second high frequency isolation transformer, and the coil of the secondary side of the first high frequency isolation transformer The ratio of the number of turns to the number of turns of the secondary side of the second high frequency isolation transformer ranges from 0.5 to 2.
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、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出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出端与所述第一谐振电容与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 tubes (Q3A, Q4A), a first driving circuit, a first filtering capacitor, a first resonant capacitor, and a first resonant inductor, a source of the high frequency switch tube (Q3A) is connected to a drain of the high frequency switch tube (Q4A), and one end of the first resonant capacitor is connected to one end of the first filter capacitor, and the high frequency switch tube ( a drain of Q3A) is connected to the other end of the first filter capacitor, a source of the high frequency switch transistor (Q4A) is connected to the other end of the first resonant capacitor, and an output of the first high frequency isolation transformer The end is connected to the intermediate point of the high frequency switch tube (Q3A) and the high frequency switch tube (Q4A) through the first resonant inductor, and the other output end of the first high frequency isolation transformer is opposite to the first a resonant capacitor is connected to an intermediate point of the first filter capacitor, and the first driving circuit is connected to the high frequency switch tube (Q3A) and the high frequency switch 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出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出端与所述第二谐振电容与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 the high frequency switching tube (Q3B) a source is connected to the drain of the high frequency switch tube (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 tube (Q3B) is The other end of the second filter capacitor is connected, the source of the high frequency switch tube (Q4B) is connected to the other end of the second resonant capacitor, and an output end of the second high frequency isolation transformer passes through the second resonant inductor Connected to an intermediate point between the high frequency switch tube (Q3B) and the high frequency switch tube (Q4B), another output end of the second high frequency isolation transformer and the second resonant capacitor and the second An intermediate point of the filter capacitor is connected, and the second driving circuit is connected to the high frequency switch tube (Q3B) and the high frequency switch tube (Q4B);
所述第一串联谐振逆变电路与所述第二串联谐振逆变电路并联;或者,所述第一串联谐振逆变电路与所述第二串联谐振逆变电路串联。The first series resonant inverter circuit is connected in parallel with the second series resonant inverter circuit; or the first series resonant inverter circuit is connected in series with the second series resonant inverter circuit.
在一些优选的实施方式中,第一串联谐振逆变电路、第二串联谐振逆变电路、第一高频隔离变压器和第二高频隔离变压器的数量均为至少一个;所述整流电路的整流元件为高频整流二极管或者具备反向并联二极管的高频开关管;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;所述整流电路的整流方式包括倍压整流和全桥整流;直流源的形式包括直流电源、电池和交流整流变换后的电源。In some preferred embodiments, the number of the first series resonant inverter circuit, the second series resonant inverter circuit, the first high frequency isolation transformer, and the second high frequency isolation transformer are all at least one; and the rectifier circuit is rectified The component is a high frequency rectifying diode or a high frequency switching tube having an antiparallel diode; the first and second series resonant inverter circuits comprise a half bridge circuit and a full bridge circuit; and the rectifying circuit of the rectifying circuit Including double voltage rectification and full bridge rectification; the form of DC source includes DC power supply, battery and AC rectified power supply.
在另一方面,本发明提供一种宽范围软开关直流变换电路的控制方 法:In another aspect, the present invention provides a control side of a wide range soft switching DC conversion circuit law:
一种宽范围软开关直流变换电路的控制方法,将第一高频隔离变压器的副边电压与第二高频隔离变压器的副边电压进行叠加,包括如下步骤:A control method for a wide-range soft-switching DC conversion circuit, which superimposes the secondary voltage of the first high-frequency isolating transformer and the secondary voltage of the second high-frequency isolating transformer, and includes the following steps:
设置预定电压比例;Setting a predetermined voltage ratio;
采集输入电压;Collecting input voltage;
根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低:若实际比例高,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于错相位模式;若实际比例低,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于同相位模式;Judging the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit: if the actual ratio is high, controlling the turn-on timing of the series resonant inverter circuit to make the first series resonant inverter circuit The second series resonant inverter circuit operates in a wrong phase mode; if the actual ratio is low, controlling the turn-on timing of the series resonant inverter circuit causes the first series resonant inverter circuit and the second series resonant inverter circuit to operate in the same phase mode;
逆变电路工作于错相位模式或者同相位模式使副边叠加后的电压下降或升高,从而加宽输出直流电压的范围。The inverter circuit operates in the wrong phase mode or the in-phase mode to lower or increase the voltage of the superimposed side, thereby widening the range of the output DC voltage.
在一些优选的实施方式中,控制第一及第二串联谐振逆变电路的开通时序的同时改变第一及第二串联谐振逆变电路的工作频率以使输出电压进一步升高或者降低。In some preferred embodiments, the operating frequencies of the first and second series resonant inverter circuits are varied while controlling the turn-on timing of the first and second series resonant inverter circuits to further increase or decrease the output voltage.
在一些优选的实施方式中,整流电路的整流元件是高频整流二极管或者具备反向并联二极管的高频开关管,如果为高频开关管:根据直流源的实时电压以及释放电流大小,改变第一及第二串联谐振逆变电路以及整流电路的频率大小以升高或者降低输出电压。In some preferred embodiments, the rectifying element of the rectifying circuit is a high frequency rectifying diode or a high frequency switching tube with an antiparallel diode. If it is a high frequency switching tube: according to the real-time voltage of the direct current source and the magnitude of the released current, the first The frequency of the first and second series resonant inverter circuits and the rectifier circuit increases or decreases the output voltage.
在一些优选的实施方式中,整流电路的整流元件为高频开关管时,整流电路的开通时序以串联谐振逆变电路的开通时序的中心为基础进行偏移且前后留有死区;若直流源的释放电流小于设定电流,整流电路的整流元件为高频开关管时,所述高频开关管不开通,整流电路工作于二极管整流状态;若直流源的释放电流在设定电流以上,整流电路中的高频开关管开通,整流电路工作于同步管整流状态。In some preferred embodiments, when the rectifying element of the rectifying circuit is a high frequency switching tube, the turn-on timing of the rectifying circuit is offset based on the center of the turn-on timing of the series resonant inverter circuit, and a dead zone is left and front; The release current of the source is less than the set current. When the rectifier component of the rectifier circuit is a high frequency switch, the high frequency switch tube is not turned on, and the rectifier circuit operates in a diode rectification state; if the release current of the DC source is above a set current, The high frequency switch tube in the rectifier circuit is turned on, and the rectifier circuit operates in the rectification state of the synchronous tube.
在进一步优选的实施方式中,若直流源的释放电流小于设定电流,整流电路的整流元件为高频开关管时,所述高频开关管不开通,整流电路工作于二极管整流状态;若直流源的释放电流在设定电流以上,整流电路中的高频开关管开通,整流电路工作于同步管整流状态。In a further preferred embodiment, if the release current of the DC source is less than the set current, and the rectifier component of the rectifier circuit is a high frequency switch transistor, the high frequency switch transistor is not turned on, and the rectifier circuit operates in a diode rectified state; The release current of the source is above the set current, the high frequency switch tube in the rectifier circuit is turned on, and the rectifier circuit operates in the rectification state of the synchronous tube.
在进一步优选的实施方式中,整流电路的整流元件为高频开关管,直流源为可提供或者可吸收能量的装置或者电路,负载为可储能及可释放电能的装置或者电路,正向或者反向控制第一及第二串联谐振逆变电路的开通时序以及整流电路的开通时序,可实现直流源和负载的能量的双向流动。In a further preferred embodiment, the rectifying element of the rectifying circuit is a high frequency switching tube, and the direct current source is a device or circuit that can provide or absorb energy, and the load is a device or circuit capable of storing and releasing electric energy, positive or Reversely controlling the turn-on timing of the first and second series resonant inverter circuits and the turn-on timing of the rectifier circuit can realize bidirectional flow of energy between the DC source and the load.
在另一方面,本发明还提供一种电能变换装置: In another aspect, the present invention also provides an electrical energy conversion device:
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任一项方法的指令。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 the signal processor, the program comprising An instruction to perform any of the above methods.
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:
根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低,通过控制器控制第一串联谐振逆变电路和第二串联谐振逆变电路的开通时序,使第一串联谐振逆变电路与第二串联谐振逆变电路工作于同步或者错相位模式,从而改变第一高频隔离变压器和第二高频隔离变压器的副边电压的相位、瞬时电压或者极性中的一个或多个。由于两个变压器的副边是串联在一起的,它们的副边电压是叠加关系,彼此之间会相加、抑制或者抵消,如此,较低的输入电压可以获得较高或更低的输出电压,较高的输入电压可以获得较低或更高的输出电压,使得本发明不仅可以适应宽广的输入电压范围,还具有更宽的输出电压范围,提高了本发明的适用性。Determining the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, and controlling the turn-on timing of the first series resonant inverter circuit and the second series resonant inverter circuit by the controller, so that The first series resonant inverter circuit and the second series resonant inverter circuit operate in a synchronous or misphase mode, thereby changing the phase, instantaneous voltage or polarity of the secondary voltage of the first high frequency isolation transformer and the second high frequency isolation transformer One or more of them. Since the secondary sides of the two transformers are connected in series, their secondary voltages are superimposed and add, suppress or cancel each other, so that lower input voltages can achieve higher or lower output voltages. The higher input voltage can achieve a lower or higher output voltage, so that the present invention can not only adapt to a wide input voltage range, but also has a wider output voltage range, which improves the applicability of the present invention.
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。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.
在优选的实施例中,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,由于第一及第二串联谐振逆变电路均为串联谐振拓扑,当逆变电路的工作频率为谐振频率时,在高频隔离变压器的副边可获得最大输出电压,因此,在改变逆变电路的开通时序的同时改变它们的工作频率,可以使输出电压进一步升高或者降低,从而进一步提高了本发明的适用性。Further, since the first and second series resonant inverter circuits are both series resonant topologies, when the operating frequency of the inverter circuit is a resonant frequency, the maximum output voltage is obtained at the secondary side of the high frequency isolation transformer, and thus, is changed. By changing the operating frequency of the inverter circuit at the same time, the output voltage can be further increased or decreased, thereby further improving the applicability of the present invention.
进一步地,整流电路的整流元件为具备反向并联二极管的高频开关管时,可实现同步整流,通过对整流电路以及逆变电路的开通时序进行控制,可输出端的直流电压的反向转换;此外,在控制逆变电路的开通时序的同时,根据直流源的实时电压以及释放电流的大小,改变逆变电路以及整流电路的工作频率大小,可以升高或者降低输出电压,进一步拓宽了输出电压的范围。Further, when the rectifying element of the rectifying circuit is a high frequency switching tube having an antiparallel diode, synchronous rectification can be realized, and by controlling the turn-on timing of the rectifying circuit and the inverter circuit, the DC voltage of the output terminal can be reversely converted; In addition, while controlling the turn-on timing of the inverter circuit, changing the operating frequency of the inverter circuit and the rectifier circuit according to the real-time voltage of the DC source and the magnitude of the release current, the output voltage can be increased or decreased, and the output voltage is further broadened. The scope.
进一步地,第一高频隔离变压器的原边的线圈匝数与第二高频隔离变压器的原边的线圈匝数相同,两者的副边线圈匝数的比值范围为0.5至2,可实现最佳功率传输和提高利用率。Further, the number of turns of the primary side of the first high-frequency isolating transformer is the same as the number of turns of the primary side of the second high-frequency isolating transformer, and the ratio of the turns of the secondary side of the first high-frequency isolating transformer is 0.5 to 2, which can be realized. Optimal power transfer and increased utilization.
进一步地,直流源为可提供或者可吸收能量的装置或者电路,负载为可储能的装置或者电路,通过反向控制第一及第二串联谐振逆变电路的开通时序以及整流电路的开通时序,可以将变压器副边的电源回送到直流源, 从而实现双向变换。Further, the DC source is a device or circuit that can provide or absorb energy, and the load is a device or circuit capable of storing energy, and the turn-on timing of the first and second series resonant inverter circuits and the turn-on timing of the rectifier circuit are controlled by reversely controlling The power supply on the secondary side of the transformer can be sent back to the DC source. Thereby achieving a two-way transformation.
附图说明DRAWINGS
图1为本发明的变换电路的电路结构示意图;1 is a schematic diagram showing the circuit structure of a conversion circuit of the present invention;
图2为本发明的控制方法的流程图;2 is a flow chart of a control method of the present invention;
图3为本发明的变换电路工作于同相位模式下的控制时序图;3 is a timing chart of control of the conversion circuit of the present invention operating in the same phase mode;
图4为本发明的变换电路工作于错相位模式下的控制时序图;4 is a timing chart of control of the conversion circuit of the present invention operating in a wrong phase mode;
图5为图1的变换电路的一种变型方式;Figure 5 is a variant of the conversion circuit of Figure 1;
图6为图1的变换电路的另一种变型方式;Figure 6 is another variation of the conversion circuit of Figure 1;
图7为图1的变换电路的又一种变型方式;Figure 7 is still another variation of the conversion circuit of Figure 1;
图8为本发明的另一个实施例的电路结构示意图;FIG. 8 is a schematic structural diagram of a circuit according to another embodiment of the present invention; FIG.
图9为本发明的又一个实施例的控制方法的流程图。9 is a flow chart of a control method according to still another embodiment 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1,本发明的宽范围软开关直流变换电路包括第一及第二串联谐振逆变电路210和220、第一及第二高频隔离变压器TRA和TRB、整流电路300和控制器400;第一及第二串联谐振逆变电路210和220的输入端与直流侧100连接;直流侧100为第一及第二串联谐振逆变电路210和220提供直流电源;第一串联谐振逆变电路210的两个输出端与第一高频隔离变压器TRA的原边的两端连接,第二串联谐振逆变电路220的两个输出端与第二高频隔离变压器TRB的原边的两端连接,第一及第二高频隔离变压器TRA和TRB的副边串联后与接入整流电路300,控制器400向第一及第二串联谐振逆变电路210和220输入控制信号,整流电路300的两个输出端与负载V2连接;控制器400根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低,从而控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路210与第二串联谐振逆变电路220工作于错相位模式或者同相位模式。Referring to FIG. 1, the wide range soft switching DC conversion circuit of the present invention includes first and second series resonant inverter circuits 210 and 220, first and second high frequency isolation transformers T RA and T RB , rectifier circuit 300 and controller 400; the input ends of the first and second series resonant inverter circuits 210 and 220 are connected to the DC side 100; the DC side 100 provides DC power to the first and second series resonant inverter circuits 210 and 220; the first series resonance inverse The two output ends of the variable circuit 210 are connected to both ends of the primary side of the first high frequency isolation transformer T RA , and the two outputs of the second series resonant inverter circuit 220 and the primary side of the second high frequency isolation transformer T RB The two ends of the first and second high-frequency isolating transformers T RA and T RB are connected in series with the access rectifier circuit 300, and the controller 400 inputs the control to the first and second series resonant inverter circuits 210 and 220. The signal, the two output ends of the rectifier circuit 300 are connected to the load V2; the controller 400 determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the converter circuit, thereby controlling the series resonant inverter Circuit The turn-on timing causes the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 to operate in a wrong phase mode or an in-phase mode.
具体的,在图1所示的实施例中,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,整流电路300的整流方式为倍压整流,整流电路300的整流元件为具备反向并联二极管的高频开关管。直流侧100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的一个输出端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的另一个输出端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,第一驱动电路211为高频开关管Q3A和高频开关管Q4A提供驱动信号;第二串联谐振逆变电路220包括两个高频开关管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的一个输出端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的另一个输出端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,第二驱动电路221为高频开关管Q3B和高频开关管Q4B提供驱动信号;控制器400与第一驱动电路211和第二驱动电路221连接,分别向第一驱动电路211和第二驱动电路221发送控制信号;在变压器的副边,第一高频隔离变压器TRA的副边的一端2A与第二高频隔离变压器TRB的副边的一端1B连接;整流电路300包括高频开关管Q1和Q2、电容C4和C5、滤波电容C2和第三驱动电路310,电容C4的一端和C5的一端串联,高频开关管Q1的源极与高频开关管Q2的漏极连接,高频开关管Q1的漏极与电容C4的另一端以及滤波电容C2的一端连接,高频开关管Q2的源极与电容C5的另一端以及滤波电容C2的另一端连接,第一高频隔离变压器TRA的副边的另一端1A连接电容C4与电容C5的中间点,第二高频隔离变压器TRB的副边的另一端2B连接高频开关管Q1与高频开关管Q2的中间点,第三驱动 电路310的一端与控制器400连接,第三驱动电路310的另外两端向高频开关管Q1和Q2发送驱动信号,负载V2接在滤波电容C2的两端。Specifically, in the embodiment shown in FIG. 1, 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 The first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both half bridge circuits, the rectification mode of the rectifier circuit 300 is voltage doubler rectification, and the rectifying elements of the rectifier circuit 300 are provided with reverse parallel connection. The high frequency switching tube of the diode. The DC side 100 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 first series resonant inverter circuit 210 includes two high The frequency switching tubes Q3A and Q4A, the first driving circuit 211, the first filter capacitor Cr2a, the first resonant capacitor Cr1a and the first resonant inductor Lra, the source of the high frequency switching transistor Q3A is connected to the drain of the high frequency switching transistor Q4A, One end of a resonant capacitor Cr1a is connected to one end of the first filter capacitor Cr2a, the drain of the high frequency switch transistor Q3A is connected to the other end of the first filter capacitor Cr2a, and the source of the high frequency switch transistor Q4A is connected to the first resonant capacitor Cr1a. Connected at the other end, an output terminal 4A of the first high-frequency isolating transformer T RA is connected to an intermediate point between the high-frequency switch tube Q3A and the high-frequency switch tube Q4A through the first resonant inductor Lra, and the other of the first high-frequency isolating transformer T RA An output terminal 5A is connected to an intermediate point of the first resonant capacitor Cr1a and the first filter capacitor Cr2a, and the first driving circuit 211 is connected to the high frequency switching transistor Q3A and the high frequency switching transistor Q4A, and the first driving circuit 211 is a high frequency switching transistor. Q3A and high frequency switch tube Q4A Providing a driving signal; the second series resonant inverter circuit 220 includes two high frequency switching transistors 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 switch The source of the tube Q3B is connected to the drain of the high frequency switch tube 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 tube Q3B is connected to the other end of the second filter capacitor Cr2b. The source of the high frequency switching transistor Q4B is connected to the other end of the second resonant capacitor Cr1b, and one output terminal 4B of the second high frequency isolation transformer T RB is connected to the high frequency switching transistor Q3B and the high frequency switch through the second resonant inductor Lrb. The intermediate point of the tube Q4B, the other output end 5B of the second high-frequency isolation transformer T RB is connected to the 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 are high. The frequency switch tube Q4B is connected, the second driving circuit 221 provides a driving signal for the high frequency switching tube Q3B and the high frequency switching tube Q4B; the controller 400 is connected to the first driving circuit 211 and the second driving circuit 221, respectively to the first driving circuit 211 and Second driving circuit 221 transmits a control signal; secondary side of the transformer, a first high frequency isolation transformer T RA of the end 2A of the secondary side connected to one end of a second secondary 1B high frequency isolation transformer T RB; a rectifying circuit 300 includes a high Frequency switch tubes Q1 and Q2, capacitors C4 and C5, filter capacitor C2 and third drive circuit 310, one end of capacitor C4 and one end of C5 are connected in series, and the source of high frequency switch tube Q1 is connected to the drain of high frequency switch tube Q2. The drain of the high frequency switch Q1 is connected to the other end of the capacitor C4 and one end of the filter capacitor C2, and the source of the high frequency switch Q2 is connected to the other end of the capacitor C5 and the other end of the filter capacitor C2. The other end 1A of the secondary side of the isolation transformer T RA is connected to the intermediate point of the capacitor C4 and the capacitor C5, and the other end 2B of the secondary side of the second high-frequency isolation transformer T RB is connected between the high-frequency switching tube Q1 and the high-frequency switching tube Q2. At one point, one end of the third driving circuit 310 is connected to the controller 400, and the other ends of the third driving circuit 310 send driving signals to the high frequency switching tubes Q1 and Q2, and the load V2 is connected to both ends of the filtering capacitor C2.
第一高频隔离变压器TRA和第二高频隔离变压器TRB是磁芯开有气隙的隔离变压器或原边串联有谐振电感的隔离变压器或副边串联有储能电感的隔离变压器,磁芯气隙的大小由正、反激的比例和系统输入输出参数共同决定,原、副边耦合系数无需另外做特定的设置。第一高频隔离变压器TRA和第二高频隔离变压器TRB的磁芯开有气隙,有一定漏感,使第一高频隔离变压器TRA和第二高频隔离变压器TRB能够在正激及反激两个状态。其漏感通过自然的绕制工艺得到,同时,根据实际的需要,可以通过绕制工艺的改变来获得可大可小的漏感。当然,如果自然绕制的漏感感量不足够,也可以在副边侧外加电感。隔离变压器不用刻意区分原边及副边的端点连接点,即不用考虑隔离变压器的起始端。The first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB are an isolating transformer with an air gap in the core or an isolating transformer with a resonant inductor connected in series or an isolating transformer with a storage inductor in the secondary side. The size of the core air gap is determined by the ratio of the positive and the reverse excitation and the input and output parameters of the system. The original and secondary coupling coefficients do not need to be specially set. The magnetic core of the first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB have an air gap and a certain leakage inductance, so that the first high-frequency isolating transformer T RA and the second high-frequency isolating transformer T RB can Both positive and negative. The leakage inductance is obtained by a natural winding process, and at the same time, according to actual needs, a leakage feeling that can be large or small can be obtained by a change in the winding process. Of course, if the amount of leakage inductance that is naturally wound is not enough, an inductor can be applied to the secondary side. The isolation transformer does not have to intentionally distinguish the end point connection points of the primary side and the secondary side, that is, the starting end of the isolation transformer is not considered.
控制器400的一端401输入采样信号,另一端402输出采样信号。当直流侧100为低压输入时,参考图1,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并联后的输入端与直流源V1连接。One end 401 of the controller 400 inputs a sampling signal, and the other end 402 outputs a sampling signal. When the DC side 100 is a low voltage input, referring to FIG. 1, the first series resonant inverter circuit 210 is connected in parallel with the second series resonant inverter circuit 220, and is connected to both ends of the high voltage energy storage filter capacitor C1 +BUS and -BUS, That is, the input end 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.
参考图2,本发明的宽范围软开关直流变换电路工作时,将第一高频隔离变压器TRA的副边电压与第二高频隔离变压器TRB的副边电压进行叠加,还采用如下控制方法:Referring to FIG. 2, when the wide-range soft-switching DC conversion circuit of the present invention operates, the secondary voltage of the first high-frequency isolating transformer T RA is superimposed with the secondary voltage of the second high-frequency isolating transformer T RB , and the following control is also adopted. method:
设置预定电压比例;通常,变换电路的实际输出电压不能高于负载所需的电压,因此,通过设置预定电压比例来约束实际输出电压;根据不同的负载,控制器400会设置不同的预定电压比例;Setting a predetermined voltage ratio; generally, the actual output voltage of the conversion circuit cannot be higher than the voltage required by the load. Therefore, the actual output voltage is constrained by setting a predetermined voltage ratio; the controller 400 sets different predetermined voltage ratios according to different loads. ;
采集输入电压;具体的,变换电路工作后,控制器400采集第一高频隔离变压器TRA的输入电压VIN-TRA和第二高频隔离变压器TRB的输入电压VIN-TRBCollecting the input voltage; specifically, after the conversion circuit is operated, the controller 400 collects the input voltage V IN-TRA of the first high-frequency isolation transformer T RA and the input voltage V IN-TRB of the second high-frequency isolation transformer T RB ;
根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低:若实际比例高,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路210与第二串联谐振逆变电路220工作于错相位模式;若实际比例低,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路210与第二串联谐振逆变电路220工作于同相位模式;具体的,输入电压的高低影响实际输出电压的高低,而实际输出电压应当 不高于负载所需的电压,将实际比例与预定电压比例比较,对实际比例的高低进行判断,根据实际比例的高低使第一串联谐振逆变电路210与第二串联谐振逆变电路220工作于同步或者错相位模式,从而使实际输出电压符合负载V2所需的电压;实际比例为(VIN-TRAnTRA+VIN-TRBnTRB)/Vout,其中,nTRA为第一高频隔离变压器TRA的匝数比(匝比),nTRB为第二高频隔离变压器TRB的匝数比(匝比),Vout为变换电路的实际输出电压。Judging the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit: if the actual ratio is high, controlling the turn-on timing of the series resonant inverter circuit to make the first series resonant inverter circuit 210 And the second series resonant inverter circuit 220 operates in a wrong phase mode; if the actual ratio is low, controlling the turn-on timing of the series resonant inverter circuit to operate the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 In-phase mode; specifically, the input voltage level affects the actual output voltage level, and the actual output voltage should not be higher than the voltage required by the load, compare the actual ratio with the predetermined voltage ratio, and judge the actual ratio, according to The actual ratio is such that the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 operate in a synchronous or misphase mode, so that the actual output voltage meets the voltage required for the load V2; the actual ratio is (V IN - TRA n TRA + V iN-TRB n TRB) / V out, wherein, n TRA is a first high frequency isolation transformer turns ratio T RA (turns ), N TRB is the second high frequency isolation transformer T RB turns ratio (turns ratio), V out is the actual output voltage conversion circuit.
逆变电路工作于错相位模式或者同相位模式使副边叠加后的电压下降或升高,从而加宽输出直流电压的范围;具体的,逆变电路工作于错相位模式时,变压器副边叠加后的电压会下降;逆变电路工作于同相位模式时,变压器副边叠加后的电压会升高。The inverter circuit operates in the wrong phase mode or the in-phase mode to lower or increase the voltage of the superimposed side, thereby widening the range of the output DC voltage; specifically, when the inverter circuit operates in the wrong phase mode, the secondary side of the transformer is superimposed. After the voltage is reduced, when the inverter circuit operates in the same phase mode, the voltage after the superposition of the secondary side of the transformer will increase.
第一串联谐振逆变电路210和第二串联谐振逆变电路220均通过高频开关管来实现逆变,控制逆变电路的开通时序实际上也就是在控制高频开关管的开通时序。The first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are both inverted by the high frequency switching tube, and the opening timing of the control inverter circuit is actually controlling the turn-on timing of the high frequency switching tube.
若为同相位模式,第一串联谐振逆变电路210的高频开关管和第二串联谐振逆变电路220的高频开关管在相同的相位开通,第一高频隔离变压器TRA的副边1A和2A两端电压的相位与第二高频隔离变压器TRB的副边1B和2B两端电压的相位相同,极性相同,两个副边电压相加,整流电路300工作,直流侧100的能量被输送到负载V2,当两个逆变电路的相位完全一致的时候,输出电压可达到最大值。由于第一串联谐振逆变电路210和第二串联谐振逆变电路220是串联谐振电路,因此变换电路可以实现一个谐振变换的过程,在全工作范围内,根据负载V2的状况改变逆变电路的工作频率或者占空比,可以保证逆变电路中的高频开关管获得软开关,降低开关损耗,有效的利用了串联谐振电路的优点,实现高效率变换。整流电路300中的高频开关管Q1和Q2,若直流源V1的释放电流小于设定电流,该设定电流具体可设置为额定电流的0.1倍,整流电路300中的开关管不开通,整流电路300工作为二极管整流状态,即利用开关管的寄生二极管自然整流;若直流源V1的释放电流在设定电流以上,高频开关管Q1和Q2接受PWM驱动信号,整流电路300工作为同步管整流状态,相关控制时序参考图2,整流电路300的开通时序以串联谐振逆变电路的开通时序的中心为基础进行偏移且前后留有死区,具体的,高频开关管Q1、Q2的开通时序分别以高频开关管Q3、Q4的开通时序的中心为基础进行偏移且留有一定的死区时间,防止出现二极管不开通状况下电流倒灌或者短路,高频开关 管Q3与Q4之间也留有一定的死区时间,以防止直通短路。In the same phase mode, the high frequency switching tube of the first series resonant inverter circuit 210 and the high frequency switching tube of the second series resonant inverter circuit 220 are turned on at the same phase, and the secondary side of the first high frequency isolation transformer T RA The phase of the voltage across the 1A and 2A is the same as the phase of the voltage across the secondary sides 1B and 2B of the second high-frequency isolating transformer T RB , the polarity is the same, the two secondary voltages are added, the rectifier circuit 300 operates, and the DC side 100 The energy is delivered to the load V2, and the output voltage can reach a maximum when the phases of the two inverter circuits are exactly the same. Since the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are series resonant circuits, the conversion circuit can implement a process of resonant transformation, and the inverter circuit is changed according to the condition of the load V2 in the full working range. The working frequency or duty ratio can ensure that the high frequency switching tube in the inverter circuit obtains soft switching, reduces switching loss, effectively utilizes the advantages of the series resonant circuit, and achieves high efficiency conversion. In the high frequency switching tubes Q1 and Q2 in the rectifier circuit 300, if the release current of the DC source V1 is less than the set current, the set current can be specifically set to 0.1 times the rated current, and the switching tube in the rectifier circuit 300 is not turned on, and is rectified. The circuit 300 operates in a diode rectified state, that is, the parasitic diode of the switch tube is naturally rectified; if the release current of the DC source V1 is above the set current, the high frequency switch tubes Q1 and Q2 receive the PWM drive signal, and the rectifier circuit 300 operates as a synchronous tube. Rectification state, related control timing Referring to FIG. 2, the turn-on timing of the rectifying circuit 300 is offset based on the center of the turn-on timing of the series resonant inverter circuit, and a dead zone is left and left. Specifically, the high frequency switching transistors Q1 and Q2 The turn-on timing is offset based on the center of the turn-on timing of the high-frequency switch transistors Q3 and Q4, respectively, and a certain dead time is left to prevent current over-current or short-circuit under the condition that the diode is not turned on, and the high-frequency switch tubes Q3 and Q4 There is also a certain dead time between them to prevent a through short circuit.
错相位模式:控制器400根据预定电压比例,判断实际比例过高,如果工作为同相位模式则会导致输出电压会高于所需要的电压,或者说无法通过调制频率及占空比来实现降压,因此控制器400会判断逆变电路需工作为错相位模式。若为错相位模式,第一串联谐振逆变电路210的高频开关管和第二串联谐振逆变电路220的高频开关管错开一定相位开通,第一高频隔离变压器TRA的副边1A和2A两端电压的相位与第二高频隔离变压器TRB的副边1B和2B两端电压的相位会相同,但极性可能出现相反的情况;或者极性相同时,由于谐振点电压不一样,瞬时电压也就不相同,所以第一高频隔离变压器TRA的副边电压与第二高频隔离变压器TRB的副边电压会相互进行抑制或者抵消,由此可见,两者会受谐振相位点的影响,不再是原来简单的叠加,即电压最高点会偏移,变换电路的输出电压对应会下降。相关控制时序参考图3,整流电路300的开通时序以串联谐振逆变电路的开通时序的中心为基础进行偏移且前后留有死区,具体的,高频开关管Q3A与Q3B错相位开通,高频开关管Q4A与Q4B错相位开通,其余与同相位模式类似。Wrong phase mode: The controller 400 determines that the actual ratio is too high according to the predetermined voltage ratio. If the operation is in the same phase mode, the output voltage will be higher than the required voltage, or the modulation frequency and duty ratio cannot be used to achieve the drop. The voltage is controlled so that the controller 400 determines that the inverter circuit needs to operate in the wrong phase mode. If it is in the wrong phase mode, the high frequency switching tube of the first series resonant inverter circuit 210 and the high frequency switching tube of the second series resonant inverter circuit 220 are shifted by a certain phase, and the secondary side 1A of the first high frequency isolation transformer T RA The phase of the voltage across the 2A and the voltage of the secondary side of the second high-frequency isolating transformer T RB will be the same as the voltage across the secondary side 1B and 2B, but the polarity may be opposite; or when the polarity is the same, since the resonance point voltage is not Similarly, the instantaneous voltage is different, so the secondary voltage of the first high-frequency isolating transformer T RA and the secondary voltage of the second high-frequency isolating transformer T RB are mutually suppressed or canceled, thereby showing that both are subject to The influence of the resonant phase point is no longer the original simple superposition, that is, the highest voltage point will be offset, and the output voltage of the conversion circuit will decrease accordingly. Referring to FIG. 3, the turn-on sequence of the rectifier circuit 300 is offset based on the center of the turn-on sequence of the series resonant inverter circuit, and a dead zone is left and right. Specifically, the high-frequency switch transistors Q3A and Q3B are turned off in phase. The high frequency switching tubes Q4A and Q4B are turned off in phase, and the rest are similar to the in-phase mode.
为进一步改变输出电压,采用如下方法:控制第一串联谐振逆变电路210和第二串联谐振逆变电路220的开通时序的同时改变第一串联谐振逆变电路210和第二串联谐振逆变电路220的工作频率以进一步升高或者降低输出电压。To further change the output voltage, a method is adopted to control the first series resonant inverter circuit 210 and the second series resonant inverter circuit while controlling the turn-on timing of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 The operating frequency of 220 is to further increase or decrease the output voltage.
根据上述可知,本发明根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低,通过控制器控制第一串联谐振逆变电路和第二串联谐振逆变电路的开通时序,使第一串联谐振逆变电路与第二串联谐振逆变电路工作于同步或者错相位模式,从而改变第一高频隔离变压器和第二高频隔离变压器的副边电压的相位、瞬时电压或者极性中的一个或多个。由于两个变压器的副边是串联在一起的,它们的副边电压是叠加关系,彼此之间会相加、抑制或者抵消,如此,较低的输入电压可以获得较高或更低的输出电压,较高的输入电压可以获得较低或更高的输出电压,使得本发明不仅可以适应宽广的输入电压范围,还具有更宽的输出电压范围,提高了本发明的适用性。同时,由于第一及第二串联谐振逆变电路均为串联谐振拓扑,当逆变电路的工作频率为谐振频率时,在高频隔离变压器的副边可获得最大输出电压,因此,在改变逆变电 路的开通时序的同时改变它们的工作频率,可以使输出电压进一步升高或者降低,从而进一步提高了本发明的适用性。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。特别地,整流电路的整流元件为高频开关管,可实现同步整流,通过对整流电路以及逆变电路的开通时序进行控制,可输出端的直流电压的反向转换。According to the above, the present invention determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, and controls the first series resonant inverter circuit and the second series resonant inverter through the controller. The turn-on timing of the circuit causes the first series resonant inverter circuit and the second series resonant inverter circuit to operate in a synchronous or misphase mode, thereby changing the phase of the secondary voltage of the first high frequency isolation transformer and the second high frequency isolation transformer One or more of instantaneous voltage or polarity. Since the secondary sides of the two transformers are connected in series, their secondary voltages are superimposed and add, suppress or cancel each other, so that lower input voltages can achieve higher or lower output voltages. The higher input voltage can achieve a lower or higher output voltage, so that the present invention can not only adapt to a wide input voltage range, but also has a wider output voltage range, which improves the applicability of the present invention. At the same time, since the first and second series resonant inverter circuits are series resonant topologies, when the operating frequency of the inverter circuit is the resonant frequency, the maximum output voltage can be obtained at the secondary side of the high frequency isolation transformer, and therefore, the inverse is changed. Substation By changing the operating frequency of the turn-on sequence of the circuit, the output voltage can be further increased or decreased, thereby further improving the applicability of the present invention. 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. In particular, the rectifying element of the rectifying circuit is a high frequency switching tube, which can realize synchronous rectification, and can control the reverse timing of the DC voltage at the output end by controlling the turn-on timing of the rectifying circuit and the inverter circuit.
以上对本发明图1的实施例进行了说明,但本发明还可以有一些变型的形式,比如:The embodiment of Fig. 1 of the present invention has been described above, but the present invention may also have some variants, such as:
参考图5,整流电路300的整流元件还可以是高频整流二极管,具体包括高频整流二极管D1和D2,整流电路300的整流方式为倍压整流;同样的,逆变电路也具有同相位模式和错相位模式,变压器副边的电压叠加后满足整流电路300中的高频整流二极管的导通条件时整流电路300导通,在错相位模式下,变压器副边的叠加电压在错开的时间段会变低,整流电路300不导通,输出电压变低;Referring to FIG. 5, the rectifying component of the rectifying circuit 300 may also be a high frequency rectifying diode, specifically including high frequency rectifying diodes D1 and D2, and the rectifying circuit 300 is rectified by double voltage rectification; similarly, the inverter circuit also has the same phase mode. And the wrong phase mode, when the voltage of the secondary side of the transformer is superimposed and the conduction condition of the high frequency rectifier diode in the rectifier circuit 300 is satisfied, the rectifier circuit 300 is turned on. In the wrong phase mode, the superimposed voltage of the secondary side of the transformer is in a staggered period. Will become low, the rectifier circuit 300 will not conduct, and the output voltage will become low;
参考图6,整流电路300的整流方式还可以是全桥整流,包括四个高频整流二极管D1至D4,其中高频整流二极管D3和D4分别代替了电容C4和C5;当然,四个高频整流二极管也可以用具备反向并联二极管的高频开关管代替;Referring to FIG. 6, the rectification mode of the rectifying circuit 300 may also be full-bridge rectification, including four high-frequency rectifying diodes D1 to D4, wherein the high-frequency rectifying diodes D3 and D4 replace the capacitors C4 and C5, respectively; of course, four high frequencies The rectifier diode can also be replaced by a high frequency switch tube with an antiparallel diode;
第一高频隔离变压器TRA的原边的线圈匝数与第二高频隔离变压器TRB的原边的线圈匝数相同,第一高频隔离变压器TRA的副边的线圈匝数与第二高频隔离变压器TRB的副边的线圈匝数的比值范围为0.5至2,这样可实现最佳功率传输和提高利用率;The same number of coil turns of the primary coil turns of the first high frequency isolation transformer T RA of the second high frequency isolation transformer T RB of the primary side, the number of turns of the first sub-frequency side of the isolation transformer T RA of The ratio of the number of turns of the secondary side of the two high-frequency isolating transformer T RB is in the range of 0.5 to 2, so that optimal power transmission and improved utilization can be achieved;
直流源V1的形式包括直流电源、电池和交流整流变换后的电源;The form of the DC source V1 includes a DC power source, a battery, and an AC rectified power supply;
参考图7,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. 7, 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.
图8表示本发明的另一个实施例,该实施例与上述实施例的区别在于:当直流侧100为高压输入时,第一串联谐振逆变电路210与第二串联谐振逆变电路220串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串联后的输入 端与直流源V1连接。该实施例也具有上述实施例的有益效果,特别地,该实施例适合变换电路的输入为高电压的场合。FIG. 8 shows another embodiment of the present invention. The difference between this embodiment and the above embodiment is that when the DC side 100 is a high voltage input, the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in series. Connected to both ends of the high-voltage energy storage filter capacitor C1 +BUS and -BUS, that is, the input after the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 are connected in series The terminal is connected to the DC source V1. This embodiment also has the advantageous effects of the above embodiments, in particular, the embodiment is suitable for the case where the input of the conversion circuit is a high voltage.
参考图9,在本发明的又一个实施例中,在根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低来控制逆变电路的开通时序的基础上,还根据直流源V1的实时电压以及释放电流大小,改变第一串联谐振逆变电路210和第二串联谐振逆变电路220以及整流电路300的频率大小。当变换电路与负载接通产生电流时,改变逆变电路以及整流电路的工作频率大小,可以升高或者降低输出电压,进一步拓宽了输出电压的范围。Referring to FIG. 9, in still another embodiment of the present invention, the basis of controlling the turn-on timing of the inverter circuit is determined by determining the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the converter circuit. The frequency magnitudes of the first series resonant inverter circuit 210 and the second series resonant inverter circuit 220 and the rectifier circuit 300 are also changed according to the real-time voltage of the DC source V1 and the magnitude of the release current. When the conversion circuit and the load are connected to generate a current, changing the operating frequency of the inverter circuit and the rectifier circuit can increase or decrease the output voltage, thereby further broadening the range of the output voltage.
在本发明的另一个实施例中,参考图1,整流电路300的整流元件为高频开关管,直流源V1为可提供能量的电路或者装置,或者为可吸收能量的电路或者装置,如电池、直流母线或者可双向变换的PFC电路,负载V2为可储能及可释放电能的电路或者装置如电池;正向或者反向施加第一串联谐振逆变电路210和第二串联谐振逆变电路220的开通时序以及整流电路300的开通时序。可以将变压器副边的电源回送到直流源V1,从而实现双向变换。In another embodiment of the present invention, referring to FIG. 1, the rectifying element of the rectifying circuit 300 is a high frequency switching tube, and the direct current source V1 is a circuit or device capable of providing energy, or a circuit or device capable of absorbing energy, such as a battery. a DC bus or a PFC circuit capable of bidirectional conversion, the load V2 being a circuit or device capable of storing and releasing electrical energy, such as a battery; applying the first series resonant inverter circuit 210 and the second series resonant inverter circuit in a forward or reverse direction The turn-on timing of 220 and the turn-on timing of rectifier circuit 300. The power supply on the secondary side of the transformer can be sent back to the DC source V1 to achieve bidirectional conversion.
本发明的再一个实施例,该实施例与上述实施例的区别在于:第一串联谐振逆变电路和第一高频隔离变压器的数量均为两个。两个第一串联谐振逆变电路的副边串联之后再与第二串联谐振逆变电路的副边串联。In still another embodiment of the present invention, the embodiment is different from the above embodiment in that the number of the first series resonant inverter circuit and the first high frequency isolation transformer are both two. The secondary sides of the two first series resonant inverter circuits are connected in series and then connected in series with the secondary side of the second series resonant inverter circuit.
本发明还提供了一种电能变换装置,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任一方法的指令。The present invention also provides a power 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 An instruction of any of the above methods.
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. 一种宽范围软开关直流变换电路,其特征在于:包括第一及第二串联谐振逆变电路、第一及第二高频隔离变压器、整流电路和控制器;所述第一及第二串联谐振逆变电路的输入端用于与直流源连接,所述第一及第二串联谐振逆变电路的两个输出端分别与第一及第二高频隔离变压器的原边的两端连接,所述第一及第二高频隔离变压器的副边串联后与接入所述整流电路,所述控制器向所述第一及第二串联谐振逆变电路输入控制信号,所述整流电路的两个输出端用于与负载连接;所述控制器根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低,从而控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于错相位模式或者同相位模式。A wide range soft switching DC conversion circuit, comprising: first and second series resonant inverter circuits, first and second high frequency isolation transformers, rectifier circuit and controller; said first and second series The input end of the resonant inverter circuit is connected to the DC source, and the two output ends of the first and second series resonant inverter circuits are respectively connected to the two ends of the primary sides of the first and second high frequency isolation transformers, After the secondary sides of the first and second high-frequency isolating transformers are connected in series and connected to the rectifier circuit, the controller inputs control signals to the first and second series resonant inverter circuits, and the rectifier circuit Two outputs are connected to the load; the controller determines the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit, thereby controlling the turn-on timing of the series resonant inverter circuit The first series resonant inverter circuit and the second series resonant inverter circuit are operated in a wrong phase mode or an in-phase mode.
  2. 如权利要求1所述的宽范围软开关直流变换电路,其特征在于:第一高频隔离变压器的原边的线圈匝数与第二高频隔离变压器的原边的线圈匝数相同,所述第一高频隔离变压器的副边的线圈匝数与所述第二高频隔离变压器的副边的线圈匝数的比值范围为0.5至2。The wide-range soft-switching DC conversion circuit according to claim 1, wherein the number of turns of the primary side of the first high-frequency isolating transformer is the same as the number of turns of the primary side of the second high-frequency isolating transformer, The ratio of the number of turns of the secondary side of the first high frequency isolation transformer to the number of turns of the secondary side of the second high frequency isolation transformer ranges from 0.5 to 2.
  3. 如权利要求1所述的宽范围软开关直流变换电路,其特征在于:The wide range soft switching DC conversion circuit of claim 1 wherein:
    第一串联谐振逆变电路包括两个高频开关管(Q3A、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出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出端与所述第一谐振电容与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, Q4A), a first driving circuit, a first filtering capacitor, a first resonant capacitor and a first resonant inductor, and the high frequency switching transistor (Q3A) The source is connected to the drain of the high frequency switch tube (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 tube (Q3A) is The other end of the first filter capacitor is connected, the source of the high frequency switch tube (Q4A) is connected to the other end of the first resonant capacitor, and an output end of the first high frequency isolation transformer passes through the first resonant inductor Connected to an intermediate point between the high frequency switch tube (Q3A) and the high frequency switch tube (Q4A), another output end of the first high frequency isolation transformer and the first resonant capacitor and the first An intermediate point of the filter capacitor is connected, and the first driving circuit is connected to the high frequency switch tube (Q3A) and the high frequency switch 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出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出端与所述第二谐振电容与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 the high frequency switching tube (Q3B) a source is connected to the drain of the high frequency switch tube (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 tube (Q3B) is The other end of the second filter capacitor is connected, the source of the high frequency switch tube (Q4B) and the second resonant capacitor The other end of the second high frequency isolation transformer is connected to the intermediate point of the high frequency switch tube (Q3B) and the high frequency switch tube (Q4B) through the second resonant inductor, the first The other output end of the two high frequency isolation transformer is connected to an intermediate point of the second resonant capacitor and the second filter capacitor, the second drive circuit and the high frequency switch tube (Q3B) and the high frequency Switch tube (Q4B) connection;
    所述第一串联谐振逆变电路与所述第二串联谐振逆变电路并联;或者,所述第一串联谐振逆变电路与所述第二串联谐振逆变电路串联。The first series resonant inverter circuit is connected in parallel with the second series resonant inverter circuit; or the first series resonant inverter circuit is connected in series with the second series resonant inverter circuit.
  4. 如权利要求1-3任一项所述的宽范围软开关直流变换电路,其特征在于:第一串联谐振逆变电路、第二串联谐振逆变电路、第一高频隔离变压器和第二高频隔离变压器的数量均为至少一个;所述整流电路的整流元件为高频整流二极管或者具备反向并联二极管的高频开关管;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;所述整流电路的整流方式包括倍压整流和全桥整流;直流源的形式包括直流电源、电池和交流整流变换后的电源。The wide-range soft-switching DC conversion circuit according to any one of claims 1 to 3, characterized by: a first series resonant inverter circuit, a second series resonant inverter circuit, a first high frequency isolation transformer and a second high The number of frequency isolation transformers is at least one; the rectifying element of the rectifier circuit is a high frequency rectifying diode or a high frequency switching tube having an antiparallel diode; and the first and second series resonant inverter circuits are in the form of a half The bridge circuit and the full bridge circuit; the rectification mode of the rectifier circuit includes double voltage rectification and full bridge rectification; the form of the DC source includes a DC power source, a battery, and an AC rectified power supply.
  5. 一种宽范围软开关直流变换电路的控制方法,将第一高频隔离变压器的副边电压与第二高频隔离变压器的副边电压进行叠加,其特征在于包括如下步骤:A control method for a wide-range soft-switching DC conversion circuit, which superimposes a secondary voltage of a first high-frequency isolating transformer and a secondary voltage of a second high-frequency isolating transformer, and is characterized by the following steps:
    设置预定电压比例;Setting a predetermined voltage ratio;
    采集输入电压;Collecting input voltage;
    根据变换电路的预定电压比例判断输入电压乘以变压器匝比后与实际输出电压的实际比例的高低:若实际比例高,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于错相位模式;若实际比例低,则控制串联谐振逆变电路的开通时序使第一串联谐振逆变电路与第二串联谐振逆变电路工作于同相位模式;Judging the input voltage multiplied by the actual ratio of the transformer turns ratio to the actual output voltage according to the predetermined voltage ratio of the conversion circuit: if the actual ratio is high, controlling the turn-on timing of the series resonant inverter circuit to make the first series resonant inverter circuit The second series resonant inverter circuit operates in a wrong phase mode; if the actual ratio is low, controlling the turn-on timing of the series resonant inverter circuit causes the first series resonant inverter circuit and the second series resonant inverter circuit to operate in the same phase mode;
    逆变电路工作于错相位模式或者同相位模式使副边叠加后的电压下降或升高,从而加宽输出直流电压的范围。The inverter circuit operates in the wrong phase mode or the in-phase mode to lower or increase the voltage of the superimposed side, thereby widening the range of the output DC voltage.
  6. 如权利要求5所述的控制方法,其特征在于:控制第一及第二串联谐振逆变电路的开通时序的同时改变第一及第二串联谐振逆变电路的工作频率以使输出电压进一步升高或者降低。The control method according to claim 5, wherein the operating frequencies of the first and second series resonant inverter circuits are changed while controlling the turn-on timing of the first and second series resonant inverter circuits to further increase the output voltage High or low.
  7. 如权利要求5所述的控制方法,其特征在于:整流电路的整流元件是高频整流二极管或者具备反向并联二极管的高频开关管,如果为高频开关管:根据直流源的实时电压以及释放电流大小,改变第一及第二串联谐振逆变电路以及整流电路的频率大小以升高或者降低输出电压。 The control method according to claim 5, wherein the rectifying element of the rectifying circuit is a high frequency rectifying diode or a high frequency switching tube having an antiparallel diode, if it is a high frequency switching tube: according to a real-time voltage of the direct current source and The magnitude of the current is released, and the frequency of the first and second series resonant inverter circuits and the rectifier circuit are changed to increase or decrease the output voltage.
  8. 如权利要求5-7任一项所述的控制方法,其特征在于:整流电路的整流元件为高频开关管时,整流电路的开通时序以串联谐振逆变电路的开通时序的中心为基础进行偏移且前后留有死区;若直流源的释放电流小于设定电流,整流电路的整流元件为高频开关管时,所述高频开关管不开通,整流电路工作于二极管整流状态;若直流源的释放电流在设定电流以上,整流电路中的高频开关管开通,整流电路工作于同步管整流状态。The control method according to any one of claims 5 to 7, wherein when the rectifying element of the rectifying circuit is a high frequency switching tube, the turn-on timing of the rectifying circuit is based on the center of the turn-on timing of the series resonant inverter circuit. Offset and leaving a dead zone before and after; if the release current of the DC source is less than the set current, when the rectifier component of the rectifier circuit is a high frequency switch transistor, the high frequency switch transistor is not turned on, and the rectifier circuit operates in a diode rectification state; The release current of the DC source is above the set current, the high frequency switch tube in the rectifier circuit is turned on, and the rectifier circuit operates in the rectification state of the synchronous tube.
  9. 如权利要求5-7任一项所述的控制方法,其特征在于:整流电路的整流元件为高频开关管,直流源为可提供或者可吸收能量的装置或者电路,负载为可储能及可释放电能的装置或者电路,正向或者反向控制第一及第二串联谐振逆变电路的开通时序以及整流电路的开通时序,可实现直流源和负载的能量的双向流动。The control method according to any one of claims 5-7, characterized in that the rectifying element of the rectifying circuit is a high frequency switching tube, and the direct current source is a device or circuit capable of providing or absorbing energy, and the load is energy storage and The device or circuit capable of releasing electrical energy controls the turn-on timing of the first and second series resonant inverter circuits and the turn-on timing of the rectifier circuit in a forward or reverse direction to realize bidirectional flow of energy of the DC source and the load.
  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。 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 the signal processor, the program comprising Instructions for performing the method of any of claims 5-9.
PCT/CN2017/112380 2017-08-14 2017-11-22 Wide-range soft-switch direct-current conversion circuit and control method therefor WO2019033603A1 (en)

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