CN115208206A - Three-port bidirectional DC-DC converter combined by CLLC resonant circuit and Buck-Boost circuit - Google Patents
Three-port bidirectional DC-DC converter combined by CLLC resonant circuit and Buck-Boost circuit Download PDFInfo
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- CN115208206A CN115208206A CN202210886398.8A CN202210886398A CN115208206A CN 115208206 A CN115208206 A CN 115208206A CN 202210886398 A CN202210886398 A CN 202210886398A CN 115208206 A CN115208206 A CN 115208206A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 39
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- 230000003071 parasitic effect Effects 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
With the development of a direct-current micro-grid system and an electric vehicle, more new requirements are provided for a bidirectional DC-DC converter in the aspects of electric energy transmission connection, routing, a vehicle-mounted power system and the like, and a multi-port topology is researched and developed to become a practical solution for meeting the requirements of equipment diversification and convenience in power supply. The invention discloses a three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit, which is characterized in that on the basis of a bidirectional CLLC resonant circuit, an inductor and two switch tubes are externally connected to the midpoint of a primary side bridge arm circuit of the converter to form a four-switch Buck-Boost circuit, so that three-port bidirectional transmission of electric energy of the converter is realized. The output voltage of the three-port bidirectional DC-DC converter adopts a control strategy of combining closed-loop regulation switching frequency and duty ratio, wherein partial voltage output of a CLLC resonance circuit adopts frequency modulation control, partial voltage output of a Buck-Boost circuit adopts variable duty ratio control, and a primary side switching tube and a secondary side switching tube of the converter can realize soft switching action.
Description
The technical field is as follows:
the invention belongs to the field of power electronic switching power supplies, and relates to a three-port bidirectional DC-DC converter structure with a CLLC resonance circuit and a Buck-Boost circuit combined.
Background art:
with the rapid development of direct-current micro-grid systems, new energy electric vehicles and energy routing systems, the demand for miniaturization and multi-porting of bidirectional DC-DC converter systems is increased. Aiming at the field of bidirectional DC-DC converters, in order to improve the reliability of a system and meet the electric energy supply requirement of the converter under the condition of multiple voltage levels, the redundancy port is added in the converter system to realize the purpose. On the basis of the topology of the existing bidirectional CLLC resonant converter, a four-switch Buck-Boost circuit is combined to form a three-port bidirectional DC-DC converter, so that the bidirectional transmission of electric energy among the ports of the converter is realized, and all MOSFETs can be subjected to soft switching action to improve the electric energy transmission efficiency of the converter.
The invention content is as follows:
in order to enable the bidirectional DC-DC converter to have three-port soft switching characteristics, and simultaneously consider the conditions of reducing the cost and the volume of the converter, the invention provides a novel three-port bidirectional DC-DC converter with soft switching characteristics by combining a Buck-Boost circuit on the basis of a bidirectional CLLC resonant converter.
The technical scheme of the invention is as follows:
a three-port bidirectional DC-DC converter combining a CLLC resonance circuit and a Buck-Boost circuit is characterized in that the Buck-Boost circuit is combined on the basis of the primary side of the bidirectional CLLC resonance circuit, so that the converter has a U p 、U 1 、U s Three independent dc voltage ports. U shape p And U 1 At the primary side of the converter, U s And on the secondary side of the converter, the primary side and the secondary side of the converter are connected through a high-frequency isolation type transformer, so that the bidirectional transmission of electric energy between the primary side and the secondary side of the converter can be realized.
The converter primary side circuit comprises: DC voltage port U p And U 1 The primary side full bridge circuit, the CLLC resonant circuit primary side resonant cavity and the primary side Buck-Boost circuit. The primary voltage port of the CLLC resonant circuit of the converter is U p The filter capacitance of the port is C p Switching tube S 1 、S 2 、S 3 And S 4 Is a primary MOSFET switch tube, switch tube S 1 And S 2 Form a first bridge arm and a switch tube S 3 And S 4 Forming a second leg. In the primary resonant cavity of CLLC resonant circuit, L rp Is a primary side resonant inductor, L rp One end of the bridge arm is connected with the first bridge arm (S) 1 And S 2 ) Is connected at the midpoint of C rp Is a primary side resonant capacitor, C rp One end of the bridge arm is connected with the second bridge arm (S) 3 And S 4 ) Are connected. Converter with a voltage regulatorThe voltage port of the primary side Buck-Boost circuit is U 1 The filter capacitance of the port is C 1 ，L 1 For inductors, Q, in Buck-Boost circuits 1 And Q 2 Is a MOSFET switching tube and a switching tube Q in a Buck-Boost circuit 1 And Q 2 Form a third bridge arm, inductor L 1 Both ends of the first bridge arm (S) 1 And S 2 ) And a third arm (Q) 1 And Q 2 ) Is connected with a switching tube Q 1 、Q 2 、S 1 、S 2 And an inductance L 1 Forming a four-switch Buck-Boost circuit.
The converter secondary side circuit comprises: DC voltage port U s A secondary side full bridge circuit and a CLLC resonant circuit secondary side resonant cavity. The voltage port of the secondary CLLC resonant circuit of the converter is U s The filter capacitance of the port is C s Switching tube S 5 、S 6 、S 7 And S 8 Is a secondary MOSFET switch tube, a switch tube S 5 And S 6 Form a fourth arm, a switching tube S 7 And S 8 Constituting a fifth arm. In the secondary cavity of the CLLC resonant circuit, L rs Is a secondary side resonant inductor, L rs One end of the bridge arm is connected with the fourth bridge arm (S) 5 And S 6 ) Is connected at the midpoint of C rs Is a secondary resonant capacitor, C rs One end of the bridge arm is connected with the fifth bridge arm (S) 7 And S 8 ) Are connected.
The transformation ratio of the primary winding to the secondary winding of the high-frequency isolation type transformer of the converter is n:1, and L is obtained during forward transmission of electric energy m Is primary side excitation inductance and L 'during reverse transmission of electric energy' m The secondary side of the transformer is excited by an inductor. The high-frequency transformer is connected with a primary resonant cavity and a secondary resonant cavity in the CLLC resonant circuit to form a primary and secondary isolated three-port bidirectional DC-DC converter.
The parameters of the primary side and the secondary side of the resonant cavity of the CLLC resonant circuit in the converter meet the following conditions:
L rp ＝n 2 L rs
C rp ＝C rs /n 2
according to the principle that the bidirectional CLLC resonance conversion circuit can adjust the impedance of the resonant cavity by controlling the working frequency of the switching tube so as to control the output voltage, and the four-switch Buck-Boost conversion circuit can control the output voltage by controlling the duty ratio of the switching tube. The invention also relates to a control method of the corresponding operation mode of the three-port bidirectional DC-DC converter combined by the CLLC resonance circuit and the Buck-Boost circuit, which comprises the following steps:
the control method of the operation mode 1 comprises the following steps: u shape p Is a primary voltage input port of a converter, U s A switching tube Q as a secondary voltage output port of the converter 1 And Q 2 In normally-off state, the port U 1 And no load is carried out, and the mode is a single-port input mode and a single-port output mode. Port U s The output voltage of the CLLC resonant circuit can be controlled by a primary side switching tube S 1 、S 2 、S 3 And S 4 And switching tube S 1 、S 2 、S 3 And S 4 Is kept synchronous, wherein the switching tube S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, in which mode the secondary switch tube S of the CLLC resonant circuit 5 、S 6 、S 7 And S 8 Switch driving signals are not applied, and rectification is realized by means of the anti-parallel parasitic diodes.
Control method of operation mode 2: u shape p For the primary voltage input port of the converter, U 1 Is the primary voltage output port of the converter, U s The output port is a secondary side voltage output port of the converter, and is in a single-port input and dual-port output mode. Four-switch Buck-Boost circuit port U 1 The output voltage of the voltage regulator is regulated by a switching tube Q 1 、Q 2 The switching duty ratio of the switching tube Q is controlled 1 And Q 2 Complementary conduction, in order to realize soft switching action of all MOSFET switching tubes, the switching tube Q 1 And Q 2 Bridge arm circuit formed by switching-on time and switching tube S 1 And S 2 The bridge arm circuit is required to maintain a certain phase relation at the turn-on time. Port U s Output electricity ofVoltage pass control CLLC resonant circuit primary side switch tube S 1 、S 2 、S 3 And S 4 In which the switching tube S is switched 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 The phases are operated in phase. In the control process of the mode, a primary side switch tube Q 1 、Q 2 、S 1 、S 2 、S 3 And S 4 The switching frequencies of the CLLC resonance circuit are all kept synchronous, and the secondary side switching tube S of the CLLC resonance circuit 5 、S 6 、S 7 And S 8 Switch driving signals are not applied, and rectification is realized by means of the anti-parallel parasitic diodes.
Control method of operation mode 3: u shape 1 Is a primary voltage input port of the converter, U p Is the primary voltage output port of the converter, U s The output port is a secondary side voltage output port of the converter, and is in a single-port input and dual-port output mode. Port U p The output voltage of the Buck-Boost circuit can be controlled by controlling the four-switch Buck-Boost circuit Q 1 And Q 2 Duty cycle is realized, wherein the switching tube Q 1 And Q 2 Complementary conducting, switching tube Q 1 And Q 2 Bridge arm circuit and switching tube S 1 、S 2 A certain phase relation is formed when the formed bridge arm circuit is switched on, so that conditions are created for soft switching actions of the four-switch Buck-Boost circuit. Port U s The output voltage can be controlled by a primary side switching tube S of the CLLC resonant circuit 1 、S 2 、S 3 And S 4 And switching tube S 1 、S 2 、S 3 And S 4 Is kept synchronous, wherein the switching tube S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 The phases are operated in phase. In the control process under the mode, the primary side switch tube Q 1 、Q 2 、S 1 、S 2 、S 3 And S 4 The switching frequencies of the CLLC resonance circuit are all kept synchronous, and the secondary side switching tube S of the CLLC resonance circuit 5 、S 6 、S 7 And S 8 Switch driving signals are not applied, and rectification is realized by means of the anti-parallel parasitic diodes.
Control method of operation mode 4: when the switch tube Q 1 And Q 2 Is normally closed and has a port U 1 No load, U s Is a secondary side voltage input port of the converter, U p The output port is a primary voltage output port of the converter and is in a single-port input and single-port output mode. Port U p The output voltage of the secondary side switching tube S can be adjusted by the CLLC resonant circuit 5 、S 6 、S 7 And S 8 The switching frequency of the switch tube S is controlled 5 、S 6 、S 7 And S 8 Is kept synchronous, wherein the switching tube S 5 And S 6 Complementary conduction, S 7 And S 8 Complementary conducting, switching tube S 5 And S 8 Operating in phase, switching tube S 6 And S 7 CLLC resonant circuit primary side switch tube S with same phase operation 1 、S 2 、S 3 And S 4 No driving signal is applied, and the rectifying output is realized by virtue of an anti-parallel parasitic diode.
Control method of operation mode 5: u shape p As primary voltage input port, U, of converter CLLC resonant circuit 1 U as a voltage input port of a converter primary four-switch Buck-Boost circuit s The secondary side voltage output port of the converter CLLC resonant circuit is in a dual-port input and single-port output mode. U shape p And U 1 The connection of the voltage between the two ports depends on regulating Q in a four-switch Buck-Boost circuit 1 And Q 2 Is switched on and off, wherein the switching tube Q is switched on and off 1 And Q 2 Complementary conducting, switching tube Q 1 And Q 2 Bridge arm circuit and switching tube S 1 And S 2 A certain phase relation is required at the turn-on moment of a formed bridge arm circuit to create conditions for soft switching actions of a four-switch Buck-Boost circuit. Port U s The voltage output of the CLLC resonant circuit is controlled by a switching tube S 1 、S 2 、S 3 And S 4 Switching frequency and four-switch Buck-Boost circuit switching tube Q 1 And Q 2 The duty ratio of the switching tube Q is comprehensively realized, and the primary side switching tube Q in the control process under the mode 1 、Q 2 、S 1 、S 2 、S 3 And S 4 The switching frequencies are all kept synchronous, wherein the switching tube Q 1 And Q 2 Complementary conduction, S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 Secondary switch tube S of CLLC resonant circuit operating in same phase 5 、S 6 、S 7 And S 8 Switch driving signals are not applied, and rectification is realized by means of the anti-parallel parasitic diodes.
The invention has the beneficial effects that:
(1) The three-port bidirectional DC-DC converter can improve the power supply stability of a converter system through the design of a redundant port, and can supply power to a bypass load under special requirements.
(2) The switching tubes on the voltage input side of the converter can realize ZVS (zero voltage switching) on in a certain switching frequency range, the switching tubes on the voltage output side can realize ZCS (zero voltage switching) off under corresponding conditions, and the realization of soft switching action can effectively improve the electric energy output efficiency of the converter.
(3) The converter has multiple operation modes, can meet the operation requirements of the bidirectional DC-DC converter in different fields and complex working conditions, and has wider voltage regulation capability.
Drawings
Fig. 1 is a circuit topology of a three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit according to the present invention.
Fig. 2 shows that the transformer operates under forward excitation when the converter transmits power from the primary side to the secondary side.
Fig. 3 shows that the transformer operates under reverse excitation when the converter transfers power from the secondary side to the primary side.
FIG. 4 shows a mode of operation 1,U of a three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit p Is a DC voltage input port, U s The mode is a single-port input and a single-port output.
FIG. 5 shows a mode of operation 2,U for a three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit p Is a DC voltage input port, U 1 Is a primary side DC voltage output port, U s The mode is a single-port input and double-port output mode.
FIG. 6 shows the operation mode 3,U of a three-port bidirectional DC-DC converter with a combination of a CLLC resonant circuit and a Buck-Boost circuit 1 Is a DC voltage input port, U p Is a primary side DC voltage output port, U s The mode is a single-port input and double-port output mode.
FIG. 7 shows the operation mode 4,U of a three-port bidirectional DC-DC converter with a combination of a CLLC resonant circuit and a Buck-Boost circuit s Is a DC voltage input port, U p The mode is a single-port input and a single-port output.
FIG. 8 shows a schematic diagram of a CLLC resonant circuit and Buck-Boost circuit combined three-port bidirectional DC-DC converter in operation mode 5,U p Is a primary side direct current voltage input port 1,U 1 Is a primary side direct current voltage input port 2,U s The mode is a secondary side direct current voltage output port, and the mode is double-port input and single-port output.
Fig. 9 shows part of the input-side cavity current and output-side cavity current waveforms of the resonant circuit of the proposed converter CLLC.
Fig. 10 shows part of the inductor current waveform of the Buck-Boost circuit of the proposed converter.
Detailed Description
The following describes a specific embodiment of a three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit according to the present invention with reference to the accompanying drawings.
FIG. 1 shows a combination of a CLLC resonant circuit and a Buck-Boost circuitA circuit topology for a port bi-directional DC-DC converter. U shape p Is a primary side voltage port, C, of a CLLC resonant circuit of the converter p For the port filter capacitor, MOSFET switch tube S 1 、S 2 、S 3 And S 4 The primary side resonant cavity device of the primary side full bridge circuit structure which forms part of the CLLC resonant circuit comprises a resonant inductor L rp Resonant capacitance C rp 。U s For the secondary voltage port, C, of the CLLC resonant circuit s For the port filter capacitor, MOSFET switch tube S 5 、S 6 、S 7 And S 8 The secondary side full bridge circuit structure of CLLC resonance circuit part is composed of secondary side resonant cavity device including resonance inductor L rs Resonant capacitance C rs . The winding transformation ratio of the primary side and the secondary side of the high-frequency isolation type transformer is recorded as n:1, and the excitation inductance of the resonant cavity of the converter is provided by the high-frequency transformer. MOSFET switch tube Q 1 、Q 2 、S 1 、S 2 And an inductance L 1 Form a four-switch Buck-Boost circuit, U 1 Is a voltage port, C, of a four-switch Buck-Boost circuit in a converter 1 Is the filter capacitance of the port.
FIG. 2 shows that the electric energy of a three-port bidirectional DC-DC converter combined by a CLLC resonant circuit and a Buck-Boost circuit provided by the invention is transmitted from the primary side to the secondary side, and an excitation inductor L in a resonant cavity m Generated by forward running excitation of a high frequency transformer.
FIG. 3 shows that the electric energy of the three-port bidirectional DC-DC converter combined by the CLLC resonant circuit and the Buck-Boost circuit is transmitted from the secondary side to the primary side, and the excitation inductance L 'in the resonant cavity' m Generated by the excitation of the high-frequency transformer by reverse operation.
mode of operation 2, as shown in FIG. 5, in which converter CLLC resonant conversion circuit primary side U p Is a voltage input port, U 1 Is a voltage output port, U, of a Buck-Boost circuit on the primary side of the converter s And a voltage closed-loop control strategy is adopted for two paths of outputs for a secondary voltage output port of a CLLC resonance conversion circuit of the converter. Acquisition port U 1 And U s The voltage value is sent to the DSP to be compared with the reference voltage of the two set ports, and the primary side switching tube Q is formed after the regulation and amplitude limiting processing of the PI controller 1 、Q 2 、S 1 、S 2 、S 3 And S 4 And a switching tube Q 1 And Q 2 The duty ratio of the PWM driving signal and the switching tube S 1 、S 2 、S 3 And S 4 The duty ratio of the primary side is kept constant and is 0.5 (including dead time of a switching tube), and the primary side switching tube Q 1 、Q 2 、S 1 、S 2 、S 3 And S 4 Is controlled at the switching frequency of r2 And f r1 Wherein the switching tube Q 1 And Q 2 Complementary conduction, S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 The phases are operated in phase. Port U 1 The output voltage of the switch tube Q 1 And Q 2 The duty ratio regulation is controlled to ensure that the soft switching action of the four-switch Buck-Boost circuit switching tube Q 1 And Q 2 Bridge arm and switch tube S 1 And S 2 The opening time between the formed bridge arms should keep a certain phase relation. Port U s The output voltage of the CLLC resonant circuit is controlled by controlling the primary side S of the CLLC resonant circuit 1 、S 2 、S 3 And S 4 Switching frequency implementation, secondary side MOSFET switching tube S of CLLC resonance circuit 5 、S 6 、S 7 And S 8 An uncontrolled rectification mode is adopted.
Mode of operation 3, as shown in FIG. 6, U 1 Is a voltage input port, U, of a Buck-Boost circuit on the primary side of a converter p Is a primary voltage output port of a CLLC resonant circuit of the converter U s For secondary side voltage output port of CLLC resonance circuit of converter, two output paths adopt voltage closed-loop control strategy, switch tube S 1 、S 2 、S 3 And S 4 The duty ratio of the primary side is kept constant and is 0.5 (including dead time of a switching tube), and the primary side switching tube Q 1 、Q 2 、S 1 、S 2 、S 3 And S 4 Is controlled at the switching frequency of r2 And f r1 Wherein the switching tube Q 1 And Q 2 Complementary conduction, S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 The phases are operated in phase. Acquisition converter Buck-Boost circuit port U p The output voltage is compared with a reference voltage value in the DSP, and the output voltage is subjected to amplitude limiting processing by a PI controller to generate a switching tube Q 1 And Q 2 Duty ratio adjustable PWM driving signal pair port U p The output voltage of the Buck-Boost circuit is controlled to ensure that the four-switch Buck-Boost circuit is in soft switching action 1 And Q 2 Bridge arm and switch tube S 1 And S 2 The switching-on time of the bridge arms should keep a certain phase relation. Collection CLLC resonant circuit port U s The output voltage of the power supply is compared with a reference voltage value in the DSP, and the output voltage is subjected to amplitude limiting processing by a PI controller to generate a switching tube S 1 、S 2 、S 3 And S 4 To the port U, a PWM drive signal of adjustable frequency s The output voltage of the switching tube Q is controlled, and the switching tube Q at the primary side is controlled in the control process 1 、Q 2 、S 1 、S 2 、S 3 And S 4 The switching frequency is kept synchronous, and the secondary side switch tube S 5 、S 6 、S 7 And S 8 An uncontrolled rectification mode is adopted.
Mode of operation 5, as shown in fig. 8, in which the primary side port U of the converter CLLC resonant circuit is connected p The primary side Buck-Boost circuit port U of the converter is used as one-path voltage input 1 As one-way voltage input, converter CLLC resonant circuit secondary side U s And as a voltage output port, a voltage closed-loop control strategy is adopted. Input port U p And U 1 The input of the converter is connected with an input voltage of a port needing to be acquired and a switching tube Q of a primary side Buck-Boost circuit of the converter is regulated 1 And Q 2 The switching duty ratio PWM driving signal of the converter CLLC resonant circuit secondary side U s The output voltage value control needs to collect the output voltage of the port, compares the output voltage with a DSP and a reference voltage signal, adjusts the output voltage by a PI controller, performs amplitude limiting processing and then generates a primary side switching tube S 1 、S 2 、S 3 And S 4 The frequency-adjustable PWM driving signal is realized. The control process comprises a primary side switching tube Q 1 、Q 2 、S 1 、S 2 、S 3 And S 4 The switching frequency remains synchronous, wherein the switching tube Q 1 And Q 2 Complementary conduction, S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, in order to ensure the soft switching action of a four-switch Buck-Boost circuit switching tube Q 1 And Q 2 Bridge arm and switch tube S 1 And S 2 The bridge arms should be kept in a certain phase relation at the turn-on time, and the secondary side switching tube S of the CLLC resonant circuit of the converter 5 、S 6 、S 7 And S 8 An uncontrolled rectification mode is adopted.
Fig. 9 shows waveforms of input-side cavity current and output-side cavity current of part of the CLLC resonant circuit of the three-port bidirectional DC-DC converter in which the CLLC resonant circuit is combined with the Buck-Boost circuit.
In fig. 10, inductance current waveforms of parts of a Buck-Boost circuit of a three-port bidirectional DC-DC converter combined by the CLLC resonant circuit and the Buck-Boost circuit are shown.
Claims (2)
1. A three-port bidirectional DC-DC converter combining a CLLC resonant circuit and a Buck-Boost circuit is characterized in that:
the converter primary side circuit comprises: DC voltage port U p And U 1 The primary side full bridge circuit, the CLLC resonant circuit primary side resonant cavity and the primary side Buck-Boost circuit; the primary side voltage port of the CLLC resonant circuit of the converter is U p The filter capacitance of the port is C p Switching tube S 1 、S 2 、S 3 And S 4 The primary MOSFET switching tube of CLLC resonant circuit forms a full-bridge circuit structure, and the switching tube S 1 And S 2 Form a first bridge arm and a switch tube S 3 And S 4 Forming a second bridge arm; in the primary resonant cavity of CLLC resonant circuit, L rp Is a primary side resonant inductor, L rp One end of the bridge arm is connected with the first bridge arm (S) 1 And S 2 ) Is connected at the midpoint of C rp Is a primary side resonant capacitor, C rp One end of the bridge arm is connected with the second bridge arm (S) 3 And S 4 ) Are connected; the voltage port of the converter primary side Buck-Boost circuit is U 1 The filter capacitance of the port is C 1 ，L 1 For inductors, Q, in Buck-Boost circuits 1 And Q 2 Is a MOSFET switching tube and a switching tube Q in a Buck-Boost circuit 1 And Q 2 Form a third bridge arm, inductor L 1 Both ends of the first bridge arm (S) 1 And S 2 ) And a third bridge arm (Q) 1 And Q 2 ) Is connected with a switching tube Q 1 、Q 2 、S 1 、S 2 And an inductance L 1 Forming a four-switch Buck-Boost circuit;
the converter secondary side circuit comprises: DC voltage port U s A secondary side full bridge circuit and a secondary side resonant cavity of the CLLC resonant circuit; the secondary voltage port of the CLLC resonant circuit of the converter is U s The filter capacitance of the port is C s Switching tubeS 5 、S 6 、S 7 And S 8 The secondary MOSFET switching tube of CLLC resonant circuit forms a full-bridge circuit structure, and the switching tube S 5 And S 6 Form a fourth arm, a switching tube S 7 And S 8 Forming a fifth bridge arm; in the secondary resonant cavity of the CLLC resonant circuit, L rs Is a secondary side resonant inductor, L rs One end of the bridge arm is connected with the fourth bridge arm (S) 5 And S 6 ) Is connected at the midpoint of C rs Is a secondary resonant capacitor, C rs One end of the bridge arm is connected with the fifth bridge arm (S) 7 And S 8 ) Are connected;
the electric energy between the ports of the converter can realize bidirectional transmission, the transformation ratio of the primary winding and the secondary winding of the high-frequency transformer is recorded as n:1, and the excitation inductance is L during forward operation m And in reverse operation, the excitation inductance is L' m And the high-frequency transformer is connected with a primary resonant cavity and a secondary resonant cavity of the CLLC resonant circuit to form a primary and secondary isolated three-port bidirectional DC-DC converter.
2. A three-port bidirectional DC-DC converter in combination with a CLLC resonant circuit and a Buck-Boost circuit as claimed in claim 1, comprising the following modes of operation:
operation mode 1: u shape p Is a primary side DC voltage input port of the converter, U s The secondary side direct current voltage output port of the converter is provided, and the operation mode is single-port input and single-port output; primary side switch tube Q 1 And Q 2 Is normally off, and the port U 1 No load, U s The port voltage of the converter can be controlled through a primary side switching tube S of a CLLC resonant circuit 1 、S 2 、S 3 And S 4 And switching tube S 1 、S 2 、S 3 And S 4 Is kept synchronous, wherein the switching tube S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, the secondary side of the CLLC resonant circuit of the converter utilizes a switching tube S 5 、S 6 、S 7 And S 8 The anti-parallel parasitic diode realizes rectification;
operation mode 2: u shape p Is a primary side DC voltage input port of the converter, U 1 Is a primary side DC voltage output port of the converter, U s The secondary side direct current voltage output port of the converter is provided, and the operation mode is single-port input and double-port output; u shape s The output voltage of the port can be controlled by a primary side switching tube S of a CLLC resonant circuit of the converter 1 、S 2 、S 3 And S 4 And switching tube S 1 、S 2 、S 3 And S 4 Is kept synchronous, wherein the switching tube S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, the secondary side of the CLLC resonant circuit of the converter utilizes a switching tube S 5 、S 6 、S 7 And S 8 The anti-parallel parasitic diode realizes rectification; u shape 1 The output voltage of the port can control a switching tube Q of a four-switch Buck-Boost circuit in the converter 1 And Q 2 Duty ratio is realized, and the switching tube Q 1 、Q 2 、S 1 And S 2 The switching frequency of (1) is kept synchronous, wherein the switching tube Q 1 And Q 2 Conducting complementarily;
operation mode 3: u shape 1 Is a primary side DC voltage input port of the converter, U p Is a primary side DC voltage output port of the converter, U s The secondary side direct current voltage output port of the converter is provided, and the operation mode is single-port input and double-port output; u shape p The output voltage of the port can pass through a switching tube Q of a four-switch Buck-Boost circuit in a control converter 1 And Q 2 Duty ratio is realized, and the switching tube Q 1 、Q 2 、S 1 And S 2 The switching frequency of (1) is kept synchronous, wherein the switching tube Q 1 And Q 2 Conducting complementarily; u shape s The output voltage of the port passes through a primary side switching tube S of a CLLC resonant circuit of a control converter 1 、S 2 、S 3 And S 4 And switching tube S 1 、S 2 、S 3 And S 4 Is kept synchronous, wherein the switching tube S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, the secondary side of the CLLC resonant circuit of the converter utilizes a switching tube S 5 、S 6 、S 7 And S 8 The anti-parallel parasitic diode realizes rectification;
operation mode 4: u shape s Is a secondary side DC voltage input port of the converter, U p The operation mode is single-port input and single-port output; switch tube Q 1 And Q 2 Is normally off, and the port U 1 No load, U p The output voltage value of the port can be controlled by controlling a secondary switch tube S of a CLLC resonant circuit 5 、S 6 、S 7 And S 8 And switching tube S 5 、S 6 、S 7 And S 8 Is kept synchronous, wherein the switching tube S 5 And S 6 Complementary conduction, S 7 And S 8 Complementary conducting, switching tube S 5 And S 8 Operating in phase, switching tube S 6 And S 7 In-phase operation, converter CLLC resonant circuit primary side utilizes switch tube S 1 、S 2 、S 3 And S 4 The anti-parallel parasitic diode realizes rectification;
operation mode 5: u shape p Is a primary side direct current voltage input port 1,U of the converter 1 Is a primary DC voltage input port 2,U of the converter s The secondary side direct-current voltage output port of the converter is provided, and the operation mode is a dual-port input mode and a single-port output mode; u shape s The output voltage of the port can be controlled by a primary side switching tube S of a CLLC resonant circuit of the converter 1 、S 2 、S 3 And S 4 Switching frequency and four-switch Buck-Boost circuit switching tube Q 1 And Q 2 Is comprehensively realized, andswitch tube S 1 、S 2 、S 3 、S 4 、Q 1 And Q 2 The switching frequency of (1) is kept synchronous, wherein the switching tube Q 1 And Q 2 Complementary conduction, S 1 And S 2 Complementary conduction, S 3 And S 4 Complementary conducting, switching tube S 1 And S 4 Operating in phase, switching tube S 2 And S 3 In-phase operation, the secondary side of the CLLC resonant circuit of the converter utilizes a switching tube S 5 、S 6 、S 7 And S 8 The anti-parallel parasitic diode of (2) realizes rectification.
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