WO2018129824A1 - 基于pfc交错反激的智能型半桥修正波电压转换电路 - Google Patents

基于pfc交错反激的智能型半桥修正波电压转换电路 Download PDF

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Publication number
WO2018129824A1
WO2018129824A1 PCT/CN2017/080982 CN2017080982W WO2018129824A1 WO 2018129824 A1 WO2018129824 A1 WO 2018129824A1 CN 2017080982 W CN2017080982 W CN 2017080982W WO 2018129824 A1 WO2018129824 A1 WO 2018129824A1
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unit
diode
switching transistor
pfc
transformer
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PCT/CN2017/080982
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English (en)
French (fr)
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廖志刚
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广东百事泰电子商务股份有限公司
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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
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion 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
    • H02M7/53—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion 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
    • H02M7/53—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • the invention relates to a voltage conversion circuit, in particular to an intelligent half-bridge modified wave voltage conversion circuit based on PFC staggered flyback.
  • the intelligent buck-boost conversion device from AC to AC is also called a travel plug.
  • the voltage conversion circuit is a key circuit thereof, and is a circuit capable of realizing AC-AC conversion, which can be AC-AC conversion realizes the function of buck-boost and stabilizes voltage and frequency.
  • most of the current AC-AC portable device market is a non-isolated topology circuit with low PF value, low output voltage quality, and poor safety and reliability. Especially in the voltage conversion process, more ripple interference is generated, which in turn affects the voltage quality.
  • the existing correction wave voltage conversion circuit has defects such as complicated circuit structure, slow response speed, and high cost.
  • the technical problem to be solved by the present invention is to provide a PFC-based interleaving method which can reduce ripple in a circuit, simplify circuit structure, reduce circuit cost, improve output voltage quality, and is safe and reliable.
  • a powerful intelligent half-bridge correction wave voltage conversion circuit is to provide a PFC-based interleaving method which can reduce ripple in a circuit, simplify circuit structure, reduce circuit cost, improve output voltage quality, and is safe and reliable.
  • the present invention adopts the following technical solutions.
  • An intelligent half-bridge modified wave voltage conversion circuit based on PFC staggered flyback includes: an input rectification and filtering unit, wherein an input end is connected to the power grid for rectifying and filtering the grid voltage; a PFC boosting unit, An output terminal connected to the input rectification filtering unit is configured to perform boost conversion on an output voltage of the input rectification filtering unit; an interleaved flyback isolation conversion unit includes a first switching tube, a second switching tube, a first transformer, and a first a second transformer, a first diode, a second diode, a third diode, and a fourth diode, the first end of the first transformer primary winding being coupled to an output of the PFC boost unit, a second end of the first transformer primary winding is connected to the drain of the first switch tube, a source of the first switch tube is connected to the front end, and a drain of the first switch tube is connected to the first diode An anode, a cathode of the first diode
  • the input rectification filtering unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, and the fuse is connected to a neutral line or a live line of the socket, and the common mode rejection
  • the front end of the inductor is connected in parallel to the socket, and the lightning protection resistor is connected in parallel to the front end of the common mode rejection inductor, and the input terminals of the safety capacitor and the rectifier bridge are connected in parallel to the rear end of the common mode rejection inductor.
  • a filter capacitor is connected in parallel with the output end of the rectifier bridge.
  • the PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifying diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the input rectifying and filtering unit, the liter
  • the back end of the voltage inductor is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal
  • the third The drain of the switch tube is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boost unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the second electrolytic capacitor
  • the negative pole is connected to the front end.
  • an MCU control unit is further included, the gate of the first switch tube, the gate of the second switch tube and the gate of the third switch tube are respectively connected to the MCU control unit, and the MCU control unit is used for respectively
  • the PWM signal is output to the first switch tube, the second switch tube and the third switch tube to control the on/off state of the first switch tube, the second switch tube and the third switch tube.
  • the MCU control unit includes a single chip microcomputer and peripheral circuits thereof.
  • the method further includes an AC sampling unit connected between the input end of the input rectifying and filtering unit and the MCU control unit, wherein the AC sampling unit is configured to collect the voltage of the AC side of the input rectifying and filtering unit and feed back to MCU control unit.
  • the AC sampling unit includes an operational amplifier, and two input ends of the operational amplifier are respectively connected to an input end of the input rectifying and filtering unit through a current limiting resistor, and an output end of the operational amplifier is connected to the MCU control unit. .
  • a first sampling resistor is connected between the source and the front end of the third switching transistor, and a source of the third switching transistor is connected to the MCU control unit, and the MCU is used by the first sampling resistor.
  • the control unit collects an electrical signal of the source of the third switching transistor.
  • the method further includes a DC voltage sampling unit, the DC voltage sampling unit includes a second sampling resistor and a third sampling resistor connected in series, and a front end of the second sampling resistor is connected to an output of the interleaved flyback isolation unit.
  • the back end of the third sampling resistor is connected to the MCU control unit, and the MCU control unit collects the electrical signal output by the interleaved flyback isolation conversion unit by the second sampling resistor and the third sampling resistor.
  • the input rectification filtering unit rectifies and filters the grid voltage, and then outputs the pulsating DC voltage, and then uses the PFC boosting unit to perform the pulsating DC voltage.
  • Boost processing in the interleaved flyback isolation conversion unit, wherein the first switch tube and the second switch tube are mutually conductive, when the first switch tube is turned on, the second switch tube is turned off, and the current is controlled by the first transformer primary winding,
  • a switching tube forms a loop to the front end, the first transformer primary winding starts to store energy; when the second switching tube is turned on, the first switching tube is turned off, and the current is formed by the second transformer primary winding, the second switching tube, and the front end.
  • the primary winding of the second transformer begins to store energy, and the primary winding of the first transformer is coupled to the secondary winding through the first transformer core, and then charges the first capacitor through the third diode to form a positive direction on the first capacitor.
  • the first diode, the second diode, the first resistor, the second resistor, the third capacitor, and the fourth capacitor in the above circuit are absorption circuits of the first switch tube and the second switch tube, respectively, for absorbing the first
  • the peak voltage generated by the leakage inductance of a transformer and a second transformer is used to reduce the voltage stress of the switching tube.
  • the above-mentioned interleaved flyback isolation unit achieves the following beneficial effects: due to the use of the alternating conduction, the current ripple in the circuit is small, the application is flexible, and the EMI, EMC interference in the circuit is small, and the circuit operating frequency is high. Therefore, the power density can be increased. Further, the output voltage can be changed by changing the primary and secondary turns ratios of the first transformer and the second transformer, thereby achieving step-up or step-down. Based on the above characteristics, the present invention achieves the beneficial effects of reducing ripple in the circuit, simplifying the circuit structure, reducing the circuit cost, improving the output voltage quality, and being safe and reliable.
  • FIG. 1 is a circuit schematic diagram of a modified wave voltage conversion circuit.
  • FIG. 2 is a circuit schematic diagram of an AC sampling unit in a preferred embodiment of the present invention.
  • FIG. 3 is a circuit schematic diagram of an MCU control unit in a preferred embodiment of the present invention.
  • the invention discloses an intelligent half-bridge modified wave voltage conversion circuit based on PFC staggered flyback, which is combined with FIG. 1 to FIG. 3 and includes:
  • An input rectification and filtering unit 10 the input end of which is connected to the power grid for rectifying and filtering the grid voltage;
  • a PFC boosting unit 20 is connected to the output end of the input rectifying and filtering unit 10 for boosting and converting the output voltage of the input rectifying and filtering unit 10;
  • An interleaved flyback isolation conversion unit 30 includes a first switching transistor Q6, a second switching transistor Q7, a first transformer T1, a second transformer T2, a first diode D6, a second diode D5, and a third a first tube D7 and a fourth diode D8, the first end of the first winding of the first transformer T1 is connected to the output end of the PFC boosting unit 20, and the second end of the primary winding of the first transformer T1 is connected to the first end a drain of the switch transistor Q6, a source of the first switch transistor Q6 is connected to the front end, a drain of the first switch transistor Q6 is connected to an anode of the first diode D6, the first diode
  • the cathode of D6 is connected to the output end of the PFC boosting unit 20 through a first resistor R26, the first resistor R26 is connected in parallel with a third capacitor C5, and the first end of the second winding of the second transformer T2 is connected to the PFC boosting unit
  • the output end of the second transformer T2 is connected to the drain of the second switching transistor Q7, the source of the second switching transistor Q7 is connected to the front end, and the second switching transistor Q7
  • the drain is connected to the anode of the second diode D5, and the cathode of the second diode D5 is connected by the second resistor R27
  • the output of the PFC boosting unit 20, the second resistor R27 is connected in parallel with a fourth capacitor C6, and the gate of the first switching transistor Q6 and the gate of the second switching transistor Q7 are respectively used to access two opposite phases.
  • the PWM pulse signal the first end of the secondary winding of the first transformer T1 is connected to the anode of the third diode D7, and the second end of the secondary winding of the first transformer T1 is connected to the back end,
  • the first end of the secondary winding of the second transformer T2 is connected to the back end, and the second end of the secondary winding of the second transformer T2 is connected to the cathode of the fourth diode D8, the third diode D7
  • the cathode of the cathode and the fourth diode D8 serves as an output of the staggered flyback isolation unit 30;
  • a DC filter unit 40 includes a first capacitor C7 and a second capacitor C8, the cathode of the third diode D7 Connected to the rear end through the first capacitor C7, the anode of the fourth diode D8 is connected to the back end through the second capacitor C8;
  • an inverter inverting unit 60 is connected to the interleaved flyback isolation unit 30.
  • the input rectification filtering unit 10 rectifies and filters the grid voltage to output a ripple DC voltage, and then uses the PFC boost unit 20 to boost the ripple DC voltage in the interleaved flyback isolation unit.
  • the first switch tube Q6 and the second switch tube Q7 are mutually conductive, when the first switch tube Q6 is turned on, the second switch tube Q7 is turned off, the current is from the first transformer T1 primary winding, the first switch tube Q6 to The front end forms a loop, the primary winding of the first transformer T1 starts to store energy; when the second switching tube Q7 is turned on, the first switching tube Q6 cuts The current is formed by the second transformer T2 primary winding, the second switching tube Q7, and the front end, and the second transformer T2 primary winding starts to store energy, and the first transformer T1 primary winding is coupled to the core through the first transformer T1.
  • the winding of the stage is charged to the first capacitor C7 via the third diode D7 to form a forward voltage on the first capacitor C7; then the first switching transistor Q6 is turned on again, and the second switching transistor Q7 is turned off, the first transformer T1
  • the energy storage, the secondary winding of the second transformer T2 charges the second capacitor C8 through the fourth diode D8, and forms a negative voltage on the second capacitor C8; thus, a positive and negative DC voltage is formed on the DC bus.
  • the first diode D6, the second diode D5, the first resistor R26, the second resistor R27, the third capacitor C5, and the fourth capacitor C6 in the above circuit are the first switch tube Q6 and the second switch tube Q7, respectively.
  • the absorbing circuit is configured to absorb the spike voltage generated by the leakage inductance of the first transformer T1 and the second transformer T2 to reduce the voltage stress of the switching tube.
  • the above-mentioned interleaved flyback isolation unit achieves the following beneficial effects: due to the use of the alternating conduction, the current ripple in the circuit is small, the application is flexible, and the EMI, EMC interference in the circuit is small, and the circuit operating frequency is high. Therefore, the power density can be increased. Further, the output voltage can be changed by changing the primary and secondary turns ratios of the first transformer T1 and the second transformer T2, thereby achieving step-up or step-down. Based on the above characteristics, the present invention achieves the beneficial effects of reducing ripple in the circuit, simplifying the circuit structure, reducing the circuit cost, improving the output voltage quality, and being safe and reliable.
  • the input rectification and filtering unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1, and the fuse F2 is connected in series.
  • the front end of the common mode suppression inductor L1 is connected in parallel to the socket, and the lightning protection resistor RV1 is connected in parallel to the front end of the common mode suppression inductor L1, and the input of the safety capacitor CX1 and the rectifier bridge DB1.
  • the terminals are all connected in parallel to the rear end of the common mode rejection inductor L1.
  • a filter capacitor C1 is connected in parallel with the output end of the rectifier bridge DB1 for filtering ripple.
  • the PFC boosting unit 20 includes a boosting inductor L2, a third switching transistor Q5, a first rectifier diode D1, and a second electrolytic capacitor C2, and the front end of the boosting inductor L2 is connected to the input rectification filter.
  • the output end of the unit 10, the rear end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5
  • the drain of the third switching transistor Q5 is connected to the anode of the first rectifier diode D1
  • the cathode of the first rectifier diode D1 is used as an output terminal of the PFC boosting unit 20
  • the first The cathode of one rectifier diode D1 is connected to the anode of the second electrolytic capacitor C2, and the cathode of the second electrolytic capacitor C2 is connected to the front end.
  • the PFC boosting unit 20 when sampling the filter capacitor C1, outputs a half-wave AC voltage, and the PFC enters the boost mode to improve the PF value of the AC-to-AC intelligent buck conversion topology circuit, and is filtered by the second electrolytic capacitor C2 after boosting.
  • the voltage after the voltage is 400V.
  • the specific boosting principle is as follows: When the third switching transistor Q5 is turned on, the current on the filter capacitor C1 forms a loop through the boost inductor L2 and the third switch Q5 to GND, and the boost inductor L2 stores energy.
  • the third switching transistor Q5 When the third switching transistor Q5 is turned off, an induced electromotive force is formed on the boosting inductor that is much higher than the input voltage, and the induced electromotive force is passed through the freewheeling tube D1. After the flow, a unidirectional pulse voltage is formed and then sent to the second electrolytic capacitor C2 for filtering, and filtered into a DC voltage of 400V. And the third switch tube Q5 increases or decreases the on-time of the third switch tube Q5 according to the change of the input AC correction wave acquired by the control chip, so that the current and the voltage phase are aligned to increase the PF value.
  • the embodiment further includes an MCU control unit 80, a gate of the first switching transistor Q6, a gate of the second switching transistor Q7, and a gate of the third switching transistor Q5.
  • the MCU control unit 80 is configured to respectively output PWM signals to the first switch tube Q6, the second switch tube Q7 and the third switch tube Q5 to control the first switch tube Q6 and the second switch.
  • the tube Q7 and the third switching tube Q5 are in an on-off state.
  • the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
  • the embodiment further includes an AC sampling unit 70 connected between the input end of the input rectifying and filtering unit 10 and the MCU control unit 80.
  • the AC sampling unit 70 is configured to collect the voltage of the AC side of the input rectification filtering unit 10 and feed back to the MCU control unit 80.
  • the AC sampling unit 70 includes an operational amplifier U9B, and two input ends of the operational amplifier U9B are respectively connected to an input end of the input rectifying and filtering unit 10 through a current limiting resistor, and an output end of the operational amplifier U9B Connected to the MCU control unit 80.
  • a first sampling resistor R2A is connected between the source and the front end of the third switching transistor Q5, and the source of the third switching transistor Q5 is connected to the MCU control unit 80.
  • the first sampling resistor R2A causes the MCU control unit 80 to collect an electrical signal of the source of the third switching transistor Q5.
  • the embodiment further includes a DC voltage sampling unit 50, and the DC voltage sampling unit 50 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series.
  • the front end of the second sampling resistor R13 is connected to the output end of the interleaved flyback isolation unit 30, and the rear end of the third sampling resistor R15 is connected to the MCU control unit 80, and the second sampling resistor R13 and The third sampling resistor R15 causes the MCU control unit 80 to acquire the electrical signal output by the interleaved flyback isolation conversion unit 30.
  • the inverter inverting unit 60 includes a fourth switching transistor Q2, a fifth switching transistor Q4, a third electrolytic capacitor C3, and a fourth electrolytic capacitor C4, and the fourth switching transistor Q2
  • the drain is connected to the positive terminal of the output of the isolated double-switch forward converter 30, the source of the fourth switching transistor Q2 is connected to the drain of the fifth switching transistor Q4, and the source of the fifth switching transistor Q4 is connected.
  • the output terminal of the isolated double-switch forward converter 30 is negative, the gate of the fourth switching transistor Q2 and the gate of the fifth switching transistor Q4 are respectively used to access two PWM pulse signals of opposite phases,
  • the anode of the third electrolytic capacitor C3 is connected to the drain of the fourth switching transistor Q2, the cathode of the third electrolytic capacitor C3 is connected to the rear end, and the cathode of the third electrolytic capacitor C3 is also connected to the fourth electrolytic capacitor C4.
  • Positive electrode, negative of the fourth electrolytic capacitor C4 The pole is connected to the source of the fifth switching transistor Q4, and the source of the fourth switching transistor Q2 and the cathode of the third electrolytic capacitor C3 serve as the output end of the inverter inverting unit 60.
  • a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a second resistor R23 is connected between the gate and the source of the fifth switching transistor Q4.
  • the DC voltage outputted by the isolated double-switch forward converter 30 is looped through the fourth switching transistor Q2, the load, and the fourth electrolytic capacitor C4 to supply power to the load to form a first half-cycle correction wave.
  • the second half-cycle correction chord level forms a loop through the fifth switch tube Q4, the load, and the third electrolytic capacitor C3, so that a complete power frequency correction wave AC voltage is formed on the load.
  • PWM2H and PWM2L are respectively sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4.
  • the phase and frequency in the inverter inverter circuit operate in accordance with the mode set in the control chip.
  • the third electrolytic capacitor C3 and the fourth electrolytic capacitor C4 also have a filtering function.
  • the inverter circuit is simple to control, and the circuit uses only two MOS tubes, and the cost is low.
  • the intelligent half-bridge modified wave voltage conversion circuit based on PFC staggered flyback disclosed in the invention has a high PF value, can realize isolation between the power grid and the output end, and has high security.
  • the output voltage can be automatically adjusted within the input full voltage range, the output frequency can be fixed, and the output voltage is a modified wave output, which has an automatic shaping function for the AC voltage.
  • the circuit of the invention is simple, convenient to control, and contains voltage and current. Sampling circuit to prevent surge voltage and current.

Abstract

一种基于PFC交错反激的智能型半桥修正波电压转换电路，包括：输入整流滤波单元（10）；PFC升压单元（20）；交错反激隔离变换单元（30），包括第一开关管（Q6）、第二开关管（Q7）、第一变压器（T1）、第二变压器（T2）、第一二极管（D6）、第二二极管（D5）、第三二极管（D7）和第四二极管（D8），第一变压器初级绕组的第二端连接于第一开关管的漏极，第二变压器初级绕组的第二端连接于第二开关管的漏极，第一变压器次级绕组的第一端连接于第三二极管的阳极，第二变压器次级绕组的第二端连接于第四二极管的阴极，第三二极管的阴极和第四二极管的阳极作为交错反激隔离变换单元的输出端；DC滤波单元（40）；逆变倒相单元（60）。该电压转换电路可降低电路中的纹波、简化电路结构及降低电路成本。

Description

基于PFC交错反激的智能型半桥修正波电压转换电路
技术领域
本发明涉及电压转换电路，尤其涉及一种基于PFC交错反激的智能型半桥修正波电压转换电路。
背景技术
现有技术中，由AC转AC的智能升降压转换装置又被称为旅行插排，该装置中，电压转换电路是其关键电路，是一种能实现AC-AC变换的电路，可以在AC-AC变换中实现升降压并稳定电压与频率的功能。然而目前的AC-AC便隽式设备市场大多数为非隔离型的拓扑电路，且PF值低、输出电压质量低、安全可靠性差。特别是在电压转换过程中，会产生较多的纹波干扰，进而影响电压质量。此外，现有的修正波电压转换电路存在电路结构复杂，响应速度慢、成本较高等缺陷。
发明内容
本发明要解决的技术问题在于，针对现有技术的不足，提供一种可降低电路中的纹波、可简化电路结构、降低电路成本、可提高输出电压质量，并且安全可靠的基于PFC交错反激的智能型半桥修正波电压转换电路。
为解决上述技术问题，本发明采用如下技术方案。
一种基于PFC交错反激的智能型半桥修正波电压转换电路，其包括有：一输入整流滤波单元，其输入端连接电网，用于对电网电压进行整流和滤波；一PFC升压单元，连接于输入整流滤波单元的输出端，用于对输入整流滤波单元的输出电压进行升压转换；一交错反激隔离变换单元，包括有第一开关管、第二开关管、第一变压器、第二变压器、第一二极管、第二二极管、第三二极管和第四二极管，所述第一变压器初级绕组的第一端连接于PFC升压单元的输出端，所述第一变压器初级绕组的第二端连接于第一开关管的漏极，所述第一开关管的源极连接于前端地，所述第一开关管的漏极连接于第一二极管的阳极，所述第一二极管的阴极通过第一电阻连接于PFC升压单元的输出端，所述第一电阻并联有第三电容，所述第二变压器初级绕组的第一端连接于PFC升压单元的输出端，所述第二变压器初级绕组的第二端连接于第二开关管的漏极，所述第二开关管的源极连接于前端地，所述第二开关管的漏极连接于第二二极管的阳极，所述第二二极管的阴极通过第二电阻连接于PFC升压 单元的输出端，所述第二电阻并联有第四电容，所述第一开关管的栅极和第二开关管的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第一变压器次级绕组的第一端连接于第三二极管的阳极，所述第一变压器次级绕组的第二端连接于后端地，所述第二变压器次级绕组的第一端连接于后端地，所述第二变压器次级绕组的第二端连接于第四二极管的阴极，所述第三二极管的阴极和第四二极管的阳极作为交错反激隔离变换单元的输出端；一DC滤波单元，包括有第一电容和第二电容，所述第三二极管的阴极通过第一电容连接于后端地，所述第四二极管的阳极通过第二电容连接于后端地；一逆变倒相单元，连接于交错反激隔离变换单元的输出端，所述逆变倒相单元用于对交错反激隔离变换单元的输出电压进行逆变转换后输出交流电。
优选地，所述输入整流滤波单元包括有插座、保险、防雷电阻、共模抑制电感、安规电容和整流桥，所述保险串接于插座的零线或火线上，所述共模抑制电感的前端并联于插座，所述防雷电阻并联于共模抑制电感的前端，所述安规电容和整流桥的输入端均并联于共模抑制电感的后端。
优选地，所述整流桥的输出端并联有滤波电容。
优选地，所述PFC升压单元包括有升压电感、第三开关管、第一整流二极管和第二电解电容，所述升压电感的前端连接于输入整流滤波单元的输出端，所述升压电感的后端连接于第三开关管的漏极，所述第三开关管的源极接前端地，所述第三开关管的栅极用于接入一路PWM控制信号，所述第三开关管的漏极连接第一整流二极管的阳极，所述第一整流二极管的阴极作为PFC升压单元的输出端，且该第一整流二极管的阴极连接第二电解电容的正极，第二电解电容的负极接前端地。
优选地，还包括有一MCU控制单元，所述第一开关管的栅极、第二开关管的栅极和第三开关管的栅极分别连接于MCU控制单元，所述MCU控制单元用于分别输出PWM信号至第一开关管、第二开关管和第三开关管，以控制第一开关管、第二开关管和第三开关管通断状态。
优选地，所述MCU控制单元包括有单片机及其外围电路。
优选地，还包括有一交流采样单元，所述交流采样单元连接于输入整流滤波单元的输入端与MCU控制单元之间，所述交流采样单元用于采集输入整流滤波单元交流侧的电压并反馈至MCU控制单元。
优选地，所述交流采样单元包括有运放，所述运放的两个输入端分别通过限流电阻而连接于输入整流滤波单元的输入端，所述运放的输出端连接于MCU控制单元。
优选地，所述第三开关管的源极与前端地之间连接有第一采样电阻，所述第三开关管的源极连接于MCU控制单元，藉由所述第一采样电阻而令MCU控制单元采集第三开关管源极的电信号。
优选地，还包括有一DC电压采样单元，所述DC电压采样单元包括有依次串联的第二采样电阻和第三采样电阻，所述第二采样电阻的前端连接于交错反激隔离变换单元的输出端，所述第三采样电阻的后端连接于MCU控制单元，藉由所述第二采样电阻和第三采样电阻而令MCU控制单元采集交错反激隔离变换单元输出的电信号。
本发明公开的基于PFC交错反激的智能型半桥修正波电压转换电路中，利用输入整流滤波单元对电网电压进行整流和滤波后输出脉动直流电压，之后利用PFC升压单元对脉动直流电压进行升压处理，在交错反激隔离变换单元中，其中第一开关管与第二开关管交互导通，当第一开关管导通时第二开关管截止，电流由第一变压器初级绕组、第一开关管到前端地形成回路，第一变压器初级绕组开始储能；当第二开关管导通时，第一开关管截止，电流由第二变压器初级绕组、第二开关管、前端地构成回路，第二变压器初级绕组开始储能，同时第一变压器初级绕组通过第一变压器磁芯藕合至次级绕组，再经第三二极管向第一电容充电，在第一电容上形成正向电压；然后第一开关管再次导通，第二开关管截止，第一变压器储能，第二变压器次级绕组通过第四二极管向第二电容充电，在第二电容上形成负向电压；这样在直流母线上就形成了正负直流电压。上述电路中的第一二极管、第二二极管、第一电阻、第二电阻、第三电容、第四电容分别为第一开关管和第二开关管的吸收电路，用来吸收第一变压器、第二变压器的漏感产生的尖峰电压，以减开关管的电压应力。上述交错反激隔离单元取得了如下有益效果：由于采用了交互导通，使得电路中的电流纹波较小、应用比较灵活，同时电路中的EMI、EMC干扰较小、电路工作频率较高，因而能够提高功率密度，此外，通过改变第一变压器、第二变压器的初次级匝数比可以改变输出电压，进而实现升压或降压。基于上述特点，本发明取得了可降低电路中的纹波、可简化电路结构、降低电路成本、可提高输出电压质量，并且安全可靠等有益效果。
附图说明
图1为修正波电压转换电路的电路原理图。
图2为本发明优选实施例中交流采样单元的电路原理图。
图3为本发明优选实施例中MCU控制单元的电路原理图。
具体实施方式
下面结合附图和实施例对本发明作更加详细的描述。
本发明公开了一种基于PFC交错反激的智能型半桥修正波电压转换电路，结合图1至图3所示，其包括有：
一输入整流滤波单元10，其输入端连接电网，用于对电网电压进行整流和滤波；
一PFC升压单元20，连接于输入整流滤波单元10的输出端，用于对输入整流滤波单元10的输出电压进行升压转换；
一交错反激隔离变换单元30，包括有第一开关管Q6、第二开关管Q7、第一变压器T1、第二变压器T2、第一二极管D6、第二二极管D5、第三二极管D7和第四二极管D8，所述第一变压器T1初级绕组的第一端连接于PFC升压单元20的输出端，所述第一变压器T1初级绕组的第二端连接于第一开关管Q6的漏极，所述第一开关管Q6的源极连接于前端地，所述第一开关管Q6的漏极连接于第一二极管D6的阳极，所述第一二极管D6的阴极通过第一电阻R26连接于PFC升压单元20的输出端，所述第一电阻R26并联有第三电容C5，所述第二变压器T2初级绕组的第一端连接于PFC升压单元20的输出端，所述第二变压器T2初级绕组的第二端连接于第二开关管Q7的漏极，所述第二开关管Q7的源极连接于前端地，所述第二开关管Q7的漏极连接于第二二极管D5的阳极，所述第二二极管D5的阴极通过第二电阻R27连接于PFC升压单元20的输出端，所述第二电阻R27并联有第四电容C6，所述第一开关管Q6的栅极和第二开关管Q7的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第一变压器T1次级绕组的第一端连接于第三二极管D7的阳极，所述第一变压器T1次级绕组的第二端连接于后端地，所述第二变压器T2次级绕组的第一端连接于后端地，所述第二变压器T2次级绕组的第二端连接于第四二极管D8的阴极，所述第三二极管D7的阴极和第四二极管D8的阳极作为交错反激隔离变换单元30的输出端；一DC滤波单元40，包括有第一电容C7和第二电容C8，所述第三二极管D7的阴极通过第一电容C7连接于后端地，所述第四二极管D8的阳极通过第二电容C8连接于后端地；一逆变倒相单元60，连接于交错反激隔离变换单元30的输出端，所述逆变倒相单元60用于对交错反激隔离变换单元30的输出电压进行逆变转换后输出交流电。
上述修正波电压转换电路中，利用输入整流滤波单元10对电网电压进行整流和滤波后输出脉动直流电压，之后利用PFC升压单元20对脉动直流电压进行升压处理，在交错反激隔离变换单元30中，其中第一开关管Q6与第二开关管Q7交互导通，当第一开关管Q6导通时第二开关管Q7截止，电流由第一变压器T1初级绕组、第一开关管Q6到前端地形成回路，第一变压器T1初级绕组开始储能；当第二开关管Q7导通时，第一开关管Q6截 止，电流由第二变压器T2初级绕组、第二开关管Q7、前端地构成回路，第二变压器T2初级绕组开始储能，同时第一变压器T1初级绕组通过第一变压器T1磁芯藕合至次级绕组，再经第三二极管D7向第一电容C7充电，在第一电容C7上形成正向电压；然后第一开关管Q6再次导通，第二开关管Q7截止，第一变压器T1储能，第二变压器T2次级绕组通过第四二极管D8向第二电容C8充电，在第二电容C8上形成负向电压；这样在直流母线上就形成了正负直流电压。上述电路中的第一二极管D6、第二二极管D5、第一电阻R26、第二电阻R27、第三电容C5、第四电容C6分别为第一开关管Q6和第二开关管Q7的吸收电路，用来吸收第一变压器T1、第二变压器T2的漏感产生的尖峰电压，以减开关管的电压应力。上述交错反激隔离单元取得了如下有益效果：由于采用了交互导通，使得电路中的电流纹波较小、应用比较灵活，同时电路中的EMI、EMC干扰较小、电路工作频率较高，因而能够提高功率密度，此外，通过改变第一变压器T1、第二变压器T2的初次级匝数比可以改变输出电压，进而实现升压或降压。基于上述特点，本发明取得了可降低电路中的纹波、可简化电路结构、降低电路成本、可提高输出电压质量，并且安全可靠等有益效果。
关于输入部分，如图1所示，所述输入整流滤波单元10包括有插座、保险F2、防雷电阻RV1、共模抑制电感L1、安规电容CX1和整流桥DB1，所述保险F2串接于插座的零线或火线上，所述共模抑制电感L1的前端并联于插座，所述防雷电阻RV1并联于共模抑制电感L1的前端，所述安规电容CX1和整流桥DB1的输入端均并联于共模抑制电感L1的后端。进一步地，所述整流桥DB1的输出端并联有滤波电容C1，用以滤除纹波。
关于升压部分，所述PFC升压单元20包括有升压电感L2、第三开关管Q5、第一整流二极管D1和第二电解电容C2，所述升压电感L2的前端连接于输入整流滤波单元10的输出端，所述升压电感L2的后端连接于第三开关管Q5的漏极，所述第三开关管Q5的源极接前端地，所述第三开关管Q5的栅极用于接入一路PWM控制信号，所述第三开关管Q5的漏极连接第一整流二极管D1的阳极，所述第一整流二极管D1的阴极作为PFC升压单元20的输出端，且该第一整流二极管D1的阴极连接第二电解电容C2的正极，第二电解电容C2的负极接前端地。
上述PFC升压单元20，当采样到滤波电容C1输出半波交流电压，PFC进入升压模式，以提高AC转AC智能降压转换拓扑电路的PF值，升压后通过第二电解电容C2滤波后的电压为400V，具体的升压原理如下：第三开关管Q5导通时，滤波电容C1上的电流经升压电感L2、第三开关管Q5到GND形成回路，升压电感L2储存能量；当第三开关管Q5关断时，升压电感上会形成比输入电压高得多的感应电动势，感应电动势经续流管D1进行整 流后形成单向脉冲电压再送给第二电解电容C2电容进滤波，滤波成400V的直流电压。并且第三开关管Q5是根据控制芯片采到的输入交流修正波变化来加大或减少第三开关管Q5的导通时间，以使电流与电压相位变一致来提高PF值。
作为一种优选方式，请参照图3，本实施例还包括有一MCU控制单元80，所述第一开关管Q6的栅极、第二开关管Q7的栅极和第三开关管Q5的栅极分别连接于MCU控制单元80，所述MCU控制单元80用于分别输出PWM信号至第一开关管Q6、第二开关管Q7和第三开关管Q5，以控制第一开关管Q6、第二开关管Q7和第三开关管Q5通断状态。进一步地，所述MCU控制单元80包括有单片机U1及其外围电路。
为了便于监测交流侧的电信号，如图2所示，本实施例还包括有一交流采样单元70，所述交流采样单元70连接于输入整流滤波单元10的输入端与MCU控制单元80之间，所述交流采样单元70用于采集输入整流滤波单元10交流侧的电压并反馈至MCU控制单元80。
进一步地，所述交流采样单元70包括有运放U9B，所述运放U9B的两个输入端分别通过限流电阻而连接于输入整流滤波单元10的输入端，所述运放U9B的输出端连接于MCU控制单元80。
为了便于对电流进行实时采集，所述第三开关管Q5的源极与前端地之间连接有第一采样电阻R2A，所述第三开关管Q5的源极连接于MCU控制单元80，藉由所述第一采样电阻R2A而令MCU控制单元80采集第三开关管Q5源极的电信号。
作为一种优选方式，为了对直流侧电信号进行采集，本实施例还包括有一DC电压采样单元50，所述DC电压采样单元50包括有依次串联的第二采样电阻R13和第三采样电阻R15，所述第二采样电阻R13的前端连接于交错反激隔离变换单元30的输出端，所述第三采样电阻R15的后端连接于MCU控制单元80，藉由所述第二采样电阻R13和第三采样电阻R15而令MCU控制单元80采集交错反激隔离变换单元30输出的电信号。
关于逆变倒相单元60，所述逆变倒相单元60包括有第四开关管Q2、第五开关管Q4、第三电解电容C3和第四电解电容C4，所述第四开关管Q2的漏极连接于隔离型双管正激变换器30的输出端正极，所述第四开关管Q2的源极连接于第五开关管Q4的漏极，所述第五开关管Q4的源极连接于隔离型双管正激变换器30的输出端负极，所述第四开关管Q2的栅极和第五开关管Q4的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第三电解电容C3的正极连接于第四开关管Q2的漏极，所述第三电解电容C3的负极连接后端地，所述第三电解电容C3的负极还连接于第四电解电容C4的正极，所述第四电解电容C4的负 极连接于第五开关管Q4的源极，所述第四开关管Q2的源极和第三电解电容C3的负极作为逆变倒相单元60的输出端。
进一步地，所述第四开关管Q2的栅极和源极之间连接有第一电阻R17，所述第五开关管Q4的栅极和源极之间连接有第二电阻R23。
上述逆变倒相单元60中，隔离型双管正激变换器30输出的直流电压经第四开关管Q2、负载、第四电解电容C4形成回路给负载供电形成第一个半周期修正波电平；第二个半周期修正弦电平通过第五开关管Q4、负载、第三电解电容C3形成回路，这样在负载上就形成了一个完整的工频修正波交流电压。控制芯片输出的PWM信号经驱动电路后分别送出PWM2H、PWM2L给第四开关管Q2、第五开关管Q4的GATE极。逆变倒相电路中的相位与频率按照控制芯片内部设定的模式进行工作。同时第三电解电容C3、第四电解电容C4还有滤波的作用。本逆变电路控制简单，电路只用两个MOS管，成本低廉。
本发明公开的基于PFC交错反激的智能型半桥修正波电压转换电路，其具有高PF值，可实现电网与输出端隔离，且安全性非常高。在输入全电压范围内能够能自动调节输出电压，可固定输出频率，并且输出电压是以修正波输出，对交流电压有自动整形功能，此外，本发明电路简单，控制方便，并且含有电压与电流采样电路，能防浪涌电压与电流。
以上所述只是本发明较佳的实施例，并不用于限制本发明，凡在本发明的技术范围内所做的修改、等同替换或者改进等，均应包含在本发明所保护的范围内。

Claims (10)

  1. 一种基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，包括有：
    一输入整流滤波单元(10)，其输入端连接电网，用于对电网电压进行整流和滤波；
    一PFC升压单元(20)，连接于输入整流滤波单元(10)的输出端，用于对输入整流滤波单元(10)的输出电压进行升压转换；
    一交错反激隔离变换单元(30)，包括有第一开关管(Q6)、第二开关管(Q7)、第一变压器(T1)、第二变压器(T2)、第一二极管(D6)、第二二极管(D5)、第三二极管(D7)和第四二极管(D8)，所述第一变压器(T1)初级绕组的第一端连接于PFC升压单元(20)的输出端，所述第一变压器(T1)初级绕组的第二端连接于第一开关管(Q6)的漏极，所述第一开关管(Q6)的源极连接于前端地，所述第一开关管(Q6)的漏极连接于第一二极管(D6)的阳极，所述第一二极管(D6)的阴极通过第一电阻(R26)连接于PFC升压单元(20)的输出端，所述第一电阻(R26)并联有第三电容(C5)，所述第二变压器(T2)初级绕组的第一端连接于PFC升压单元(20)的输出端，所述第二变压器(T2)初级绕组的第二端连接于第二开关管(Q7)的漏极，所述第二开关管(Q7)的源极连接于前端地，所述第二开关管(Q7)的漏极连接于第二二极管(D5)的阳极，所述第二二极管(D5)的阴极通过第二电阻(R27)连接于PFC升压单元(20)的输出端，所述第二电阻(R27)并联有第四电容(C6)，所述第一开关管(Q6)的栅极和第二开关管(Q7)的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第一变压器(T1)次级绕组的第一端连接于第三二极管(D7)的阳极，所述第一变压器(T1)次级绕组的第二端连接于后端地，所述第二变压器(T2)次级绕组的第一端连接于后端地，所述第二变压器(T2)次级绕组的第二端连接于第四二极管(D8)的阴极，所述第三二极管(D7)的阴极和第四二极管(D8)的阳极作为交错反激隔离变换单元(30)的输出端；
    一DC滤波单元(40)，包括有第一电容(C7)和第二电容(C8)，所述第三二极管(D7)的阴极通过第一电容(C7)连接于后端地，所述第四二极管(D8)的阳极通过第二电容(C8)连接于后端地；
    一逆变倒相单元(60)，连接于交错反激隔离变换单元(30)的输出端，所述逆变倒相单元(60)用于对交错反激隔离变换单元(30)的输出电压进行逆变转换后输出交流电。
  2. 如权利要求1所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述输入整流滤波单元(10)包括有插座、保险(F2)、防雷电阻(RV1)、共模抑制电感(L1)、安规电容(CX1)和整流桥(DB1)，所述保险(F2)串接于插座的零线或火线上，所述共模抑制电感(L1)的前端并联于插座，所述防雷电阻(RV1)并联于共模抑制电 感(L1)的前端，所述安规电容(CX1)和整流桥(DB1)的输入端均并联于共模抑制电感(L1)的后端。
  3. 如权利要求2所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述整流桥(DB1)的输出端并联有滤波电容(C1)。
  4. 如权利要求1所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述PFC升压单元(20)包括有升压电感(L2)、第三开关管(Q5)、第一整流二极管(D1)和第二电解电容(C2)，所述升压电感(L2)的前端连接于输入整流滤波单元(10)的输出端，所述升压电感(L2)的后端连接于第三开关管(Q5)的漏极，所述第三开关管(Q5)的源极接前端地，所述第三开关管(Q5)的栅极用于接入一路PWM控制信号，所述第三开关管(Q5)的漏极连接第一整流二极管(D1)的阳极，所述第一整流二极管(D1)的阴极作为PFC升压单元(20)的输出端，且该第一整流二极管(D1)的阴极连接第二电解电容(C2)的正极，第二电解电容(C2)的负极接前端地。
  5. 如权利要求4所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，还包括有一MCU控制单元(80)，所述第一开关管(Q6)的栅极、第二开关管(Q7)的栅极和第三开关管(Q5)的栅极分别连接于MCU控制单元(80)，所述MCU控制单元(80)用于分别输出PWM信号至第一开关管(Q6)、第二开关管(Q7)和第三开关管(Q5)，以控制第一开关管(Q6)、第二开关管(Q7)和第三开关管(Q5)通断状态。
  6. 如权利要求5所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述MCU控制单元(80)包括有单片机(U1)及其外围电路。
  7. 如权利要求5所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，还包括有一交流采样单元(70)，所述交流采样单元(70)连接于输入整流滤波单元(10)的输入端与MCU控制单元(80)之间，所述交流采样单元(70)用于采集输入整流滤波单元(10)交流侧的电压并反馈至MCU控制单元(80)。
  8. 如权利要求7所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述交流采样单元(70)包括有运放(U9B)，所述运放(U9B)的两个输入端分别通过限流电阻而连接于输入整流滤波单元(10)的输入端，所述运放(U9B)的输出端连接于MCU控制单元(80)。
  9. 如权利要求5所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，所述第三开关管(Q5)的源极与前端地之间连接有第一采样电阻(R2A)，所述第三开关管(Q5)的源极连接于MCU控制单元(80)，藉由所述第一采样电阻(R2A)而令MCU 控制单元(80)采集第三开关管(Q5)源极的电信号。
  10. 如权利要求5所述的基于PFC交错反激的智能型半桥修正波电压转换电路，其特征在于，还包括有一DC电压采样单元(50)，所述DC电压采样单元(50)包括有依次串联的第二采样电阻(R13)和第三采样电阻(R15)，所述第二采样电阻(R13)的前端连接于交错反激隔离变换单元(30)的输出端，所述第三采样电阻(R15)的后端连接于MCU控制单元(80)，藉由所述第二采样电阻(R13)和第三采样电阻(R15)而令MCU控制单元(80)采集交错反激隔离变换单元(30)输出的电信号。
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