CN110829878A - Novel bidirectional AC/DC converter - Google Patents
Novel bidirectional AC/DC converter Download PDFInfo
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- CN110829878A CN110829878A CN201911230788.4A CN201911230788A CN110829878A CN 110829878 A CN110829878 A CN 110829878A CN 201911230788 A CN201911230788 A CN 201911230788A CN 110829878 A CN110829878 A CN 110829878A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a novel bidirectional AC/DC converter, wherein the first stage of the bidirectional AC/DC converter adopts totem-pole staggered bridgeless Power Factor Correction (PFC), can process high power and obtain high-quality power grid current. Qe、QfAnd Qg、QhAnd the parallel connection is used, so that the conduction loss is reduced, and the efficiency of the charger is improved. The CLLLC resonant bidirectional DC/DC converter has symmetrical circuit structure and consistent forward and reverse working performance, and has the advantages of high efficiency and high power density as the second stage of the novel bidirectional AC/DC converter. The first-stage bidirectional AC/DC converter circuit is used as an interface circuit of a power grid side and a second-stage bidirectional AC/DC converter circuit and is responsible for controlling alternating current side current and direct current bus voltage, so that better grid side current quality is obtained and stable direct current is provided for the second-stage bidirectional AC/DC converter circuit; the second-stage bidirectional DC/DC circuit is responsible for controlling the output sideVoltage and current can be charged and discharged reasonably and orderly according to the scheduling signal.
Description
Technical Field
The invention relates to the field of three-phase electric energy conversion, in particular to a novel AC/DC converter.
Technical Field
Along with the gradual exhaustion of fossil energy and the pollution of the traditional fuel vehicle to the environment, more and more people pay attention to the pollution. Electric energy used by electric vehicles can be obtained from renewable energy sources, and thus, the electric vehicles are widely concerned and popularized all over the world. The vehicle-mounted charger of the electric automobile converts alternating current of a power grid into direct current to charge the electric automobile, and the performance of the charger has very important influence on the electric automobile and the power grid. The electric energy of the electric automobile is direct current which is converted by an electric automobile charger from alternating current electric energy through a power electronic converter. Therefore, the research on the power electronic converter with high efficiency, high performance and small pollution to the power grid can realize the high-efficiency use of electric energy and has important significance for prolonging the service life of the electric automobile and the battery. In conclusion, the electric vehicle bidirectional charger works in the forward direction to realize AC-DC and power grid access to charge the power battery of the electric vehicle; the reverse operation realizes DC-AC, and the electric energy is reversely inverted from the battery pack to generate household alternating current. The charging and discharging functions can be well integrated in the power electronic converter, the high-efficiency utilization and high-power density integration of the power electronic converter are realized, and the product cost and the volume are reduced. Harmonic current is generated in the conversion process, and in order to eliminate the harmonic current fundamentally, a power factor correction technology is adopted to improve the harmonic level and the power factor of the power electronic device.
Disclosure of Invention
The invention provides a novel bidirectional AC/DC converter in order to realize bidirectional conversion of AC-DC and DC-AC and obtain high-quality power grid current. Compared with the traditional AC/DC converter, the bidirectional transmission is realized, the conduction loss is reduced, the charger efficiency is improved, reasonable and orderly charging and discharging can be carried out according to the scheduling signal, and the application prospect is very wide.
The technical scheme adopted by the invention is as follows:
a novel bidirectional AC/DC converter comprises a main circuit and a control circuit, wherein the main circuit comprises two stages, the first stage adopts totem-pole type staggered bridgeless PFC, and a switching tube Qe、QfAnd a switching tube Qg、QhThe parallel connection is used; the CLLLC resonant bidirectional DC/DC converter is used as a second stage of the novel bidirectional AC/DC converter; the totem-pole staggered bridgeless PFC is characterized in that two freewheeling diodes are replaced by two power switching devices on the basis of the traditional totem-pole bridgeless PFC, so that the bidirectional flow of energy can be realized, and the totem-pole bridgeless PFC is used in parallel in a parallel connection mode, so that the loss is further reduced, and the charger efficiency is improved; CLLLThe C resonant type bidirectional DC-DC converter comprises a first port, a second port, a resonant circuit, a switch loop and a transformer, wherein the first port is a power supply end, the other port is correspondingly used as a load end, and the power supply end is connected with a direct current output end of the totem-pole staggered bridgeless PFC.
The totem-pole interleaved bridgeless PFC comprises an alternating current power supply Vac, an alternating current input side inductor Lac1, an alternating current input side inductor Lac2, an output capacitor C and 8 power switching devices Qa、Qb、Qc、Qd、Qe、Qf、Qg、Qh(ii) a One end of an AC input side inductor Lac1 and one end of an AC input side inductor Lac2 are connected to an AC power supply Vac, and a switching tube QaSource electrode connecting switch tube QbDrain electrode, switching tube QaSource and switch tube QbThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 1; switch tube QcSource electrode connecting switch tube QdDrain electrode, switching tube QcSource and switch tube QdThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 2; switch tube QeSource electrode connecting switch tube QfDrain electrode, switching tube QeSource and switch tube QfThe common node connected with the drain is connected with the other end of the alternating current power supply Vac; switch tube QaAnd a switching tube QcAnd a switching tube QeThe common ends of the drain electrodes are connected together, and the common end of the drain electrode is connected to one end of an output capacitor C; switch tube QbAnd a switching tube QdAnd a switching tube QfThe source electrode common ends are connected together, and the source electrode common end is connected to the other end of the output capacitor C; switch tube QgIs connected in parallel to the switching tube QeAt two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode; switch tube QhIs connected in parallel to the switching tube QfAnd at two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode.
The output end of the totem-pole interleaved bridgeless PFC is the input end of the CLLLC resonant bidirectional DC/DC converter, and the voltage is stabilized through a capacitor C; one end of the capacitor C is connected with the switch tube QgOne end of the drain electrode is connected with the switching tube QhOf the substrate.
The CLLLC resonant bidirectional DC-DC converter comprises four primary side Mos switch Q1、Q2、Q3、Q4Four secondary side Mos switches Q5、Q6、Q7、Q8Primary side resonant inductor Lr1Secondary side resonance inductance Lr2Primary side resonant capacitor Cr1Secondary side resonance capacitor Cr2And a field inductor LmThe transformer of (1); wherein four primary side switches Q1、Q2、Q3、Q4Form a full bridge circuit and a primary side resonant inductor Lr1And a primary side resonant capacitor Cr1Are connected in series with a capacitor CpnAnd four secondary side switches Q between the primary side of the transformer5、Q6、Q7、Q8Form a full bridge circuit and a secondary side resonance inductor Lr2Secondary side resonance capacitor Cr2Are connected in series between the load R and the secondary side of the transformer.
When the forward working network voltage is positive, the switch tube Qe、QgFinal off, switching tube Qf、QhIs always conducted; switch tube Qa、QbHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac1, wherein the switching tube QbIs a main switch tube, and a switch is hung with anger QaFollow current tubes, i.e. when switching tubes QbSwitch on and off tube QaWhen the switch is closed, the inductor is charged to store energy; when the switch tube QaSwitch on and off tube QbWhen the switch is closed, the inductor discharges to release energy to the direct current side; switch tube Qc、QdHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac2, wherein the switching tube QdIs a main switch tube, and a switch is hung with anger QcFollow current tubes, i.e. when switching tubes QdSwitch on and off tube QcWhen the switch is closed, the inductor is charged to store energy; when the switch tube QcSwitch on and off tube QdWhen the power supply is closed, the inductor discharges to release energy to the direct current side, and therefore the Boost function is completed. When the voltage of the power grid is negative, the working condition is similar to that of the positive half cycle, and the description is omitted; thereby realizing a three-phase PFC function.Controlling Mos switch Q1、Q4And Q2、Q3Adding complementary drive signal to realize inversion function, secondary side switch Q5、Q6、Q7、Q8And a driving signal is not added, and a diode with a switching tube connected in anti-parallel is adopted for rectification, so that DC/DC conversion is realized.
Control of Mos switch Q during reverse operation5、Q8And Q6、Q7Adding complementary driving signals to realize inversion function, and switching Q at primary side1、Q2、Q3、Q4A driving signal is not added, and a diode with a switching tube connected in anti-parallel is adopted for rectification to realize DC/DC conversion; when the totem-pole staggered bridgeless PFC works in a grid-connected inversion mode, the working condition of the circuit is just symmetrical to that of a forward working mode, the switching tubes respectively form a Buck circuit in positive and negative half cycles of a power grid, the energy of a direct current side is transmitted to the power grid side, and the switching tube Q is controlleda~QhThe inversion of DC/AC and the correction of power factor are realized.
Drawings
FIG. 1 is a circuit topology diagram of a bidirectional AC/DC converter of the present invention;
FIG. 2 shows a switching tube Q of a bidirectional AC/DC converter according to the present inventiona、Qb、Qe、QfA drive signal;
FIG. 3 shows a Mos switch tube (Q) on the primary side of a bidirectional AC/DC converter according to the present invention1And Q2) Working principle diagram when conducting;
FIG. 4 shows a resonant inductor L at the primary side of a bidirectional AC/DC converter according to the present inventionr1Current and excitation inductance L ofmWorking principle diagrams when the currents are equal;
FIG. 5 shows a Mos switch transistor (Q) on the primary side of a bidirectional AC/DC converter according to the present invention1And Q2) Working principle diagram when turning off;
FIG. 6 shows a Mos switch tube (Q) on the primary side of a bidirectional AC/DC converter according to the present invention3And Q4) Working principle diagram when conducting.
Detailed Description
FIG. 1 shows a novel bidirectional AC/DC converter, the main circuit comprises two stages, the first stage adopts totem pole type staggered bridgeless PFC, and a switching tube Qe、QfAnd a switching tube Qg、QhThe parallel connection is used; the CLLLC resonant bidirectional DC/DC converter is used as a second stage of the novel bidirectional AC/DC converter; the totem-pole staggered bridgeless PFC is characterized in that two freewheeling diodes are replaced by two power switching devices on the basis of the traditional totem-pole bridgeless PFC, so that the bidirectional flow of energy can be realized, and the totem-pole bridgeless PFC is used in parallel in a parallel connection mode, so that the loss is further reduced, and the charger efficiency is improved; the CLLLC resonant bidirectional DC-DC converter comprises a first port, a second port, a resonant circuit, a switch loop and a transformer, wherein the first port is a power supply end, the other port is correspondingly used as a load end, and the power supply end is connected with a direct current output end of a totem-pole interleaved bridgeless PFC.
The totem-pole interleaved bridgeless PFC comprises an alternating current power supply Vac, an alternating current input side inductor Lac1, an alternating current input side inductor Lac2, an output capacitor C and 8 power switching devices Qa、Qb、Qc、Qd、Qe、Qf、Qg、Qh(ii) a One end of an AC input side inductor Lac1 and one end of an AC input side inductor Lac2 are connected to an AC power supply Vac, and a switching tube QaSource electrode connecting switch tube QbDrain electrode, switching tube QaSource and switch tube QbThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 1; switch tube QcSource electrode connecting switch tube QdDrain electrode, switching tube QcSource and switch tube QdThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 2; switch tube QeSource electrode connecting switch tube QfDrain electrode, switching tube QeSource and switch tube QfThe common node connected with the drain is connected with the other end of the alternating current power supply Vac; switch tube QaAnd a switching tube QcAnd a switching tube QeThe common ends of the drain electrodes are connected together, and the common end of the drain electrode is connected to one end of an output capacitor C; switch tube QbAnd a switching tube QdAnd a switching tube QfSource electrodeThe common ends are connected together, and the source electrode common end of the common ends is connected with the other end of the output capacitor C; switch tube QgIs connected in parallel to the switching tube QeAt two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode; switch tube QhIs connected in parallel to the switching tube QfAnd at two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode.
The output end of the totem-pole interleaved bridgeless PFC is the input end of the CLLLC resonant bidirectional DC/DC converter, and the voltage is stabilized through a capacitor C; one end of the capacitor C is connected with the switch tube QgOne end of the drain electrode is connected with the switching tube QhOf the substrate.
The CLLLC resonant bidirectional DC-DC converter comprises four Mos switches Q on the primary side1、Q2、Q3、Q4Four secondary side Mos switches Q5、Q6、Q7、Q8Primary side resonant inductor Lr1Secondary side resonance inductance Lr2Primary side resonant capacitor Cr1Secondary side resonance capacitor Cr2And a field inductor LmThe transformer of (1); wherein four primary side switches Q1、Q2、Q3、Q4Form a full bridge circuit and a primary side resonant inductor Lr1And a primary side resonant capacitor Cr1Are connected in series with a capacitor CpnAnd four secondary side switches Q between the primary side of the transformer5、Q6、Q7、Q8Form a full bridge circuit and a secondary side resonance inductor Lr2Secondary side resonance capacitor Cr2Are connected in series between the load R and the secondary side of the transformer.
When the forward working network voltage is positive, the switch tube Qe、QgFinal off, switching tube Qf、QhIs always conducted; switch tube Qa、QbHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac1, wherein the switching tube QbIs a main switch tube, and a switch is hung with anger QaFollow current tubes, i.e. when switching tubes QbSwitch on and off tube QaWhen the switch is closed, the inductor is charged to store energy; when the switch tube QaSwitch on and off tube QbWhen turned off, the inductor dischargesReleasing energy to the direct current side; switch tube Qc、QdHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac2, wherein the switching tube QdIs a main switch tube, and a switch is hung with anger QcFollow current tubes, i.e. when switching tubes QdSwitch on and off tube QcWhen the switch is closed, the inductor is charged to store energy; when the switch tube QcSwitch on and off tube QdWhen the power supply is closed, the inductor discharges to release energy to the direct current side, and therefore the Boost function is completed. When the voltage of the power grid is negative, the working condition is similar to that of the positive half cycle, and the description is omitted; thereby realizing a three-phase PFC function. Controlling Mos switch Q1、Q4And Q2、Q3Adding complementary drive signal to realize inversion function, secondary side switch Q5、Q6、Q7、Q8And a driving signal is not added, and a diode with a switching tube connected in anti-parallel is adopted for rectification, so that DC/DC conversion is realized.
Control of Mos switch Q during reverse operation5、Q8And Q6、Q7Adding complementary driving signals to realize inversion function, and switching Q at primary side1、Q2、Q3、Q4A driving signal is not added, and a diode with a switching tube connected in anti-parallel is adopted for rectification to realize DC/DC conversion; when the totem-pole staggered bridgeless PFC works in a grid-connected inversion mode, the working condition of the circuit is just symmetrical to that of a forward working mode, the switching tubes respectively form a Buck circuit in positive and negative half cycles of a power grid, the energy of a direct current side is transmitted to the power grid side, and the switching tube Q is controlleda~QhThe inversion of DC/AC and the correction of power factor are realized.
In the working process, a first-stage bidirectional AC/DC circuit is started according to a normal forward charging working mode, double closed-loop work is carried out after soft start is completed, and at the moment, no power is transmitted basically; after the first-stage bidirectional AC/DC circuit establishes stable direct-current bus voltage, the second-stage bidirectional DC/DC circuit is ready to start, the working frequency is gradually reduced to a preset stable working point according to a proper soft start strategy, then the whole machine starts to work normally, so that the whole machine finishes integral starting, the two-stage circuit of the converter starts to operate stably to realize power transmission, and when discharge needs to be carried out in a reverse working mode, energy on the output side of the rear-stage bidirectional DC/DC circuit is transmitted to a power grid through the first-stage circuit through the direct-current bus.
Claims (6)
1. The novel bidirectional AC/DC converter is characterized by comprising a main circuit and a control circuit, wherein the main circuit comprises two stages, a first stage adopts totem-pole type staggered bridgeless PFC (power factor correction), and a switching tube Qe、QfAnd a switching tube Qg、QhThe parallel connection is used; the CLLLC resonant bidirectional DC/DC converter is used as a second stage of the novel bidirectional AC/DC converter; the totem-pole staggered bridgeless PFC is characterized in that two freewheeling diodes are replaced by two power switching devices on the basis of the traditional totem-pole bridgeless PFC, so that the bidirectional flow of energy can be realized, and the totem-pole bridgeless PFC is used in parallel in a parallel connection mode, so that the loss is further reduced, and the charger efficiency is improved; the CLLLC resonant bidirectional DC-DC converter comprises a first port, a second port, a resonant circuit, a switch loop and a transformer, wherein the first port is a power supply end, the other port is correspondingly used as a load end, and the power supply end is connected with a direct current output end of a totem-pole interleaved bridgeless PFC.
2. The novel bidirectional AC/DC converter as claimed in claim 1, wherein: the totem-pole interleaved bridgeless PFC comprises an alternating current power supply Vac, an alternating current input side inductor Lac1, an alternating current input side inductor Lac2, an output capacitor C and 8 power switching devices Qa、Qb、Qc、Qd、Qe、Qf、Qg、Qh(ii) a One end of an AC input side inductor Lac1 and one end of an AC input side inductor Lac2 are connected to an AC power supply Vac, and a switching tube QaSource electrode connecting switch tube QbDrain electrode, switching tube QaSource and switch tube QbThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 1; switch tube QcSource electrode connecting switch tube QdDrain electrode, switching tube QcSource and switch tube QdThe common node connected with the drain is connected with the other end of the alternating current input side inductor Lac 2; switch tube QeSource electrode connecting switch tube QfDrain electrode, switching tube QeSource and switch tube QfThe common node connected with the drain is connected with the other end of the alternating current power supply Vac; switch tube QaAnd a switching tube QcAnd a switching tube QeThe common ends of the drain electrodes are connected together, and the common end of the drain electrode is connected to one end of an output capacitor C; switch tube QbAnd a switching tube QdAnd a switching tube QfThe source electrode common ends are connected together, and the source electrode common end is connected to the other end of the output capacitor C; switch tube QgIs connected in parallel to the switching tube QeAt two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode; switch tube QhIs connected in parallel to the switching tube QfAnd at two ends, the source electrode is connected with the source electrode, and the drain electrode is connected with the drain electrode.
3. The novel bidirectional AC/DC converter as claimed in claim 1, wherein: the output end of the totem-pole interleaved bridgeless PFC is the input end of the CLLLC resonant bidirectional DC/DC converter, and the voltage is stabilized through a capacitor C; one end of the capacitor C is connected with the switch tube QgOne end of the drain electrode is connected with the switching tube QhOf the substrate.
4. The novel bidirectional AC/DC converter as claimed in claim 1, wherein: the CLLLC resonant bidirectional DC-DC converter comprises four primary side Mos switch Q1、Q2、Q3、Q4Four secondary side Mos switches Q5、Q6、Q7、Q8Primary side resonant inductor Lr1Secondary side resonance inductance Lr2Primary side resonant capacitor Cr1Secondary side resonance capacitor Cr2And a field inductor LmThe transformer of (1); wherein four primary side switches Q1、Q2、Q3、Q4Form a full bridge circuit and a primary side resonant inductor Lr1And a primary side resonant capacitor Cr1Are connected in series with a capacitor CpnAnd four secondary side switches Q between the primary side of the transformer5、Q6、Q7、Q8Form a full bridge circuitSide resonance inductor Lr2Secondary side resonance capacitor Cr2Are connected in series between the load R and the secondary side of the transformer.
5. The novel bidirectional AC/DC converter as claimed in claim 1, wherein: when the forward working network voltage is positive, the switch tube Qe、QgFinal off, switching tube Qf、QhIs always conducted; switch tube Qa、QbHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac1, wherein the switching tube QbIs a main switch tube, and a switch is hung with anger QaFollow current tubes, i.e. when switching tubes QbSwitch on and off tube QaWhen the switch is closed, the inductor is charged to store energy; when the switch tube QaSwitch on and off tube QbWhen the switch is closed, the inductor discharges to release energy to the direct current side; switch tube Qc、QdHigh-frequency operation, and thus a Boost circuit is formed by the high-frequency operation and the alternating current input side inductor Lac2, wherein the switching tube QdIs a main switch tube, and a switch is hung with anger QcFollow current tubes, i.e. when switching tubes QdSwitch on and off tube QcWhen the switch is closed, the inductor is charged to store energy; when the switch tube QcSwitch on and off tube QdWhen the power supply is closed, the inductor discharges to release energy to the direct current side, so that the Boost function is completed; when the voltage of the power grid is negative, the working condition is similar to that of the positive half cycle, and the description is omitted, so that the three-phase PFC function is realized; controlling Mos switch Q1、Q4And Q2、Q3Adding complementary drive signal to realize inversion function, secondary side switch Q5、Q6、Q7、Q8And a driving signal is not added, and a diode with a switching tube connected in anti-parallel is adopted for rectification, so that DC/DC conversion is realized.
6. The novel bidirectional AC/DC converter as claimed in claim 1, wherein: control of Mos switch Q during reverse operation5、Q8And Q6、Q7Adding complementary driving signals to realize inversion function, and switching Q at primary side1、Q2、Q3、Q4Without addingThe driving signal is rectified by a diode with a switching tube connected in anti-parallel to realize DC/DC conversion; when the totem-pole staggered bridgeless PFC works in a grid-connected inversion mode, the working condition of the circuit is just symmetrical to that of a forward working mode, the switching tubes respectively form a Buck circuit in positive and negative half cycles of a power grid, the energy of a direct current side is transmitted to the power grid side, and the switching tube Q is controlleda~QhThe inversion of DC/AC and the correction of power factor are realized.
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| WO2022088256A1 (en) * | 2020-10-30 | 2022-05-05 | 深圳市思倍生电子科技有限公司 | Bidirectional inverter circuit and bidirectional inverter charging apparatus |
| CN112542950A (en) * | 2020-11-27 | 2021-03-23 | 株洲中车时代电气股份有限公司 | Bidirectional DC/DC converter, urban rail vehicle and traction system thereof |
| CN112532100A (en) * | 2020-12-17 | 2021-03-19 | 哈尔滨理工大学 | Bidirectional hybrid rectifier based on LCLC resonance |
| CN115833562A (en) * | 2022-12-05 | 2023-03-21 | 国网河南省电力公司济源供电公司 | Open-loop PFC (Power factor correction) control method based on totem-pole bidirectional AC/DC (alternating Current/direct Current) converter |
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