WO2018126555A1 - 基于pfc、全桥和半桥的智能型正弦波电压转换电路 - Google Patents

基于pfc、全桥和半桥的智能型正弦波电压转换电路 Download PDF

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Publication number
WO2018126555A1
WO2018126555A1 PCT/CN2017/080981 CN2017080981W WO2018126555A1 WO 2018126555 A1 WO2018126555 A1 WO 2018126555A1 CN 2017080981 W CN2017080981 W CN 2017080981W WO 2018126555 A1 WO2018126555 A1 WO 2018126555A1
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Prior art keywords
switch tube
switching transistor
unit
bridge
pfc
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PCT/CN2017/080981
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English (en)
French (fr)
Inventor
廖志刚
侯涛
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广东百事泰电子商务股份有限公司
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Publication of WO2018126555A1 publication Critical patent/WO2018126555A1/zh

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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
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to a voltage conversion circuit, in particular to an intelligent sine wave voltage conversion circuit based on PFC, full bridge and half bridge.
  • 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.
  • a certain high-frequency pulse signal exists on the output side of the circuit, thereby affecting the quality of the output voltage, and thus it is difficult to meet the conversion requirement.
  • the technical problem to be solved by the present invention is that, in view of the deficiencies of the prior art, a PF value of a voltage conversion device can be improved, an output voltage quality can be improved, and a high frequency pulse on the output side can be filtered, thereby providing a high quality load.
  • Intelligent sinusoidal voltage conversion circuit for power frequency sinusoidal alternating current is provided.
  • the present invention adopts the following technical solutions.
  • An intelligent sinusoidal voltage conversion circuit based on PFC, full bridge and half bridge comprising an input unit for providing a DC voltage, a PFC boost unit for boosting the output voltage of the input unit, and: a full bridge isolation conversion unit includes a first switch tube, a second switch tube, a sixth switch tube, a seventh switch tube, a transformer, a first diode, a second diode, and a first filter inductor,
  • the drain of the sixth switch tube is connected to the output end of the PFC boost unit, the source of the sixth switch tube is connected to the first end of the primary winding of the transformer, and the drain of the second switch tube is connected to the primary winding of the transformer
  • the second end of the second switch tube is connected to the front end, the drain of the first switch tube is connected to the output end of the PFC boost unit, and the source of the first switch tube is connected to the transformer a second end of the primary winding, a drain of the seventh switch is connected to a first end of the primary winding of the transformer,
  • a cathode of the fourth electrolytic capacitor is connected to a source of the fifth switching transistor, a source of the fourth switching transistor is connected to a front end of the second filter inductor, a rear end of the second filter inductor, and a third electrolytic capacitor
  • the negative pole serves as the output of the inverter inverter unit.
  • a first resistor is connected between the gate and the source of the fourth switching transistor, and a second resistor is connected between the gate and the source of the fifth switching transistor.
  • the input unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppresses the inductance.
  • the front end is connected in parallel to the socket, the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, and the input terminals of the safety capacitor and the rectifier bridge are both connected in parallel with the rear end of the common mode suppression inductor, and the output ends of the rectifier bridge are connected in parallel Filter capacitor.
  • the PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifier diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the input unit, the boosting inductor
  • the back end 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 switch tube
  • the drain 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 boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.
  • the method further includes an MCU control unit, a gate of the first switch tube, a gate of the second switch tube, a gate of the third switch tube, a gate of the sixth switch tube, and a gate of the seventh switch tube.
  • the poles are respectively connected to the MCU control unit, and the MCU control unit is configured to respectively output PWM signals to the first switch tube, the second switch tube, the third switch tube, the sixth switch tube and the seventh switch tube to control the first switch The on and off states of the tube, the second switch tube, the third switch tube, the sixth switch tube, and the seventh switch tube.
  • the method further includes an AC sampling unit connected between the input end of the input unit and the MCU control unit, wherein the AC sampling unit is configured to collect the voltage of the AC side of the input unit and feed back to the 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 second sampling resistor and a third sampling resistor connected in series, the front end of the second sampling resistor is connected to an output end of the full bridge isolation conversion unit, and the back end of the third sampling resistor is connected
  • the MCU control unit causes the MCU control unit to acquire an electrical signal output by the full bridge isolation transform unit by the second sampling resistor and the third sampling resistor.
  • the MCU control unit includes a single chip microcomputer and peripheral circuits thereof.
  • the DC voltage outputted by the input unit is boosted by the PFC boosting unit, and then output to the full bridge isolation conversion unit,
  • the bridge isolation conversion unit when the first switching tube and the seventh switching tube are turned on, the current is formed by the first switching tube, the transformer primary coil, and the seventh switching tube to the front end, and the voltage of the primary winding of the transformer is directly on the bottom.
  • the second diode is filtered by the reverse voltage to the second capacitor, forming a DC voltage on the second capacitor; when the second switch and When the sixth switch tube is turned on, the current is formed by the second switch tube, the transformer primary coil, and the sixth switch tube to the front end, and the transformer primary winding voltage is up and down, and then coupled to the transformer secondary through the transformer core.
  • the voltage passing through the first diode is a forward voltage, and is transmitted to the first capacitor, and a DC voltage that is positive and negative is formed on the first capacitor, so that the DC bus is present. Positive and negative voltages is formed.
  • the first capacitor, the second capacitor and the first filter inductor form a filter circuit.
  • the output voltage can be adjusted to achieve boost or buck conversion.
  • the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.
  • the invention provides a second filter inductor at the output end of the inverter inverting unit, and the second filter inductor can filter out the high frequency pulse in the output signal of the inverter inverting unit, so that the load can obtain high quality. Power frequency sinusoidal AC, which in turn improves the output voltage quality to meet power supply requirements.
  • FIG. 1 is a schematic diagram of a sinusoidal voltage conversion circuit of the present invention.
  • 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 sinusoidal voltage conversion circuit based on PFC, full bridge and half bridge. As shown in FIG. 1 to FIG. 3, it comprises an input unit 10 for providing a DC voltage, and is used for the input unit 10 The output voltage is boosted by the PFC boost unit 20, as well as:
  • a full bridge isolation conversion unit 30 includes a first switch tube Q6, a second switch tube Q7, a sixth switch tube Q8, a seventh switch tube Q9, a transformer T1, a first diode D5, and a second diode D6.
  • the first filter inductor L3 the drain of the sixth switch transistor Q8 is connected to the output end of the PFC boost unit 20, and the source of the sixth switch transistor Q8 is connected to the first end of the primary winding of the transformer T1.
  • the drain of the second switch transistor Q7 is connected to the second end of the primary winding of the transformer T1, the source of the second switch transistor Q7 is connected to the front end, and the drain of the first switch transistor Q6 is connected to the PFC boost.
  • a source of the first switch tube Q6 is connected to a second end of the primary winding of the transformer T1 and a drain of the seventh switch tube Q9 is connected to a first end of the primary winding of the transformer T1,
  • the source of the seventh switching transistor Q9 is connected to the front end, the gate of the first switching transistor Q6, the gate of the second switching transistor Q7, the gate of the sixth switching transistor Q8, and the gate of the seventh switching transistor Q9.
  • the middle tap of the secondary winding of the transformer T1 is connected to the back end ground, the voltage transformation
  • the first end of the T1 secondary winding is connected to the anode of the first diode D5
  • the cathode of the first diode D5 is connected to the back end through the first capacitor C7
  • the cathode of the first diode D5 Connected to the front end of the first filter inductor L3
  • the second end of the secondary winding of the transformer T1 is connected to the cathode of the second diode D6
  • the anode of the second diode D6 is connected to the cathode through the second capacitor C8.
  • Terminally, the rear end of the first filter inductor L3 and the anode of the second diode D6 serve as an output end of the full bridge isolation conversion unit 30;
  • An inverter inverting unit 40 includes a fourth switching transistor Q2, a fifth switching transistor Q4, a third electrolytic capacitor C3, a fourth electrolytic capacitor C5 and a second filter inductor L4, and the drain of the fourth switching transistor Q2 Connected to the positive terminal of the full-bridge isolation conversion unit 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 to the full-bridge isolation conversion
  • the output terminal of the unit 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, and the positive connection of the third electrolytic capacitor C3
  • the anode of the third electrolytic capacitor C3 is connected to the rear end of the fourth switching transistor Q2, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5, the fourth electrolytic capacitor.
  • the cathode of C5 is connected to the source of the fifth switching transistor Q4, the source of the fourth switching transistor Q2 is connected to the front end of the second filter inductor L4, the rear end of the second filter inductor L4 and the third electrolytic capacitor C3.
  • the negative pole serves as the output of the inverter inverter unit 40.
  • the DC voltage output from the input unit 10 is boosted by the PFC boosting unit 20, and then output to the full-bridge isolation conversion unit 30.
  • the first switch When the tube Q6 and the seventh switch tube Q9 are turned on, the current is formed by the first switch tube Q6, the transformer T1 primary coil, and the seventh switch tube Q9 to the front end, and the voltage of the primary winding of the transformer T1 is positive and negative, and then passes.
  • the transformer T1 core is coupled to the transformer secondary, the second diode D6 is filtered by the reverse voltage to the second capacitor C8, and a DC voltage is formed on the second capacitor C8; when the second switch Q7 When the sixth switch tube Q8 is turned on, the current is formed by the second switch tube Q7, the transformer T1 primary coil, and the sixth switch tube Q8 to the front end, and the transformer T1 primary winding voltage is up-down and negative, and then magnetically passed through the transformer T1.
  • the core is coupled to the transformer secondary. At this time, the voltage passing through the first diode D5 is a forward voltage, and is transmitted to the first capacitor C7, and a DC voltage is formed on the first capacitor C7, which is positively and negatively negative. Busbar Forming a negative voltage.
  • the first capacitor C7, the second capacitor C8 and the first filter inductor L3 constitute a filter circuit. And by changing the turns ratio of the primary and secondary of the transformer T1, the output voltage can be adjusted to achieve boost or buck conversion. Based on the above structure, the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.
  • the second filter inductor L4 is disposed at the output end of the inverter inverter unit 40, and the high-frequency pulse in the output signal of the inverter inverter unit can be filtered by the second filter inductor L4, so that the load can be Obtain high-quality power frequency sinusoidal AC power to improve output voltage quality to meet power supply requirements.
  • 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 fourth switching transistor Q2 when the fourth switching transistor Q2 is turned on, the fourth switching transistor Q2, the load, and the fourth electrolytic capacitor C5 form a loop, and the first high-frequency pulse level is generated to the load, and the fourth
  • the freewheeling circuit is formed by the fourth electrolytic capacitor C5, the body diode of the fifth switching transistor Q4, and the second filter inductor L4; when the fifth switching transistor Q4 is turned on, the fifth switching transistor Q4, the load,
  • the third electrolytic capacitor C3 forms a loop, and a second high frequency pulse level is formed on the load.
  • the fifth switching transistor Q4 When the fifth switching transistor Q4 is turned off, the body diode of the fourth switching transistor Q2, the third electrolytic capacitor C3, the load, The second filter inductor L4 forms a freewheeling circuit.
  • the high frequency driving PWM signal of the fourth switching transistor Q2 and the fifth switching transistor Q4 is changed by the power frequency sinusoidal modulation and then sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4.
  • the driving signals of the fourth switching transistor Q2 and the fifth switching transistor Q4 are modulated by the power frequency, and the current flowing through the fourth switching transistor Q2 and the fifth switching transistor Q4 is sinusoidal.
  • the second filter inductor L4 Since the second filter inductor L4 has a high impedance characteristic for the high frequency pulse, the high frequency component is filtered by the second filter inductor L4, and a power frequency sinusoidal alternating voltage is formed on the load.
  • the third electrolytic capacitor C3 and the fourth electrolytic capacitor C5 also have a filtering function, and can form a DC filter circuit with the first filter inductor L3.
  • the inverter circuit is simple to control, and the circuit uses only two MOS tubes, and the cost is low.
  • the input 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.
  • the fuse F2 is connected in series to the socket.
  • the front end of the common mode suppression inductor L1 is connected in parallel to the socket, the lightning protection resistor RV1 is connected in parallel to the front end of the common mode suppression inductor L1, and the input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are both Parallel to the rear end of the common mode rejection inductor L1, and the filter capacitor C1 is connected in parallel with the output terminal of the rectifier bridge DB1.
  • 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.
  • the front end of the boosting inductor L2 is connected to the input unit 10.
  • the output 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 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 20, and the first rectification is performed.
  • the cathode of the 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 if the filter capacitor C1 outputs a half-wave AC voltage, the PFC enters the boost mode to increase the PF value of the AC-to-AC intelligent buck conversion topology circuit, and after boosting, filtering through the second electrolytic capacitor C2.
  • 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 transistor Q5 to GND, and the boost inductor L2 stores energy; When the third switching transistor Q5 is turned off, an induced electromotive force is formed on the boosting inductor which is much higher than the input voltage, and the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the second electrolytic capacitor C2 capacitor. Filtered 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 switch tube Q6, a gate of the second switch tube Q7, and a gate of the third switch tube Q5.
  • the gate of the sixth switching transistor Q8 and the gate of the seventh switching transistor Q9 are respectively connected to the MCU control unit 80, and the MCU control unit 80 is configured to respectively output PWM signals to the first switching transistor Q6 and the second switching transistor Q7.
  • a third switch tube Q5, a sixth switch tube Q8, and a seventh switch tube Q9 for controlling the first switch tube Q6, the second switch tube Q7, the third switch tube Q5, the sixth switch tube Q8, and the seventh switch tube Q9 On/off status.
  • the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
  • an AC sampling unit 70 is further included.
  • the AC sampling unit 70 is connected between the input end of the input unit 10 and the MCU control unit 80.
  • the AC sampling unit is The 70 is used to collect the voltage on the AC side of the input 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 second sampling resistor R13 and a third sampling resistor R15 connected in series, and the front end of the second sampling resistor R13 is connected to the whole
  • An output of the bridge isolation unit 30, a rear end of the third sampling resistor R15 is connected to the MCU control unit 80, and the MCU control unit 80 acquires the second sampling resistor R13 and the third sampling resistor R15.
  • the full bridge isolates the electrical signal output by the transform unit 30.
  • the intelligent sinusoidal voltage conversion circuit based on PFC, full bridge and half bridge 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 sinusoidal output, and the AC voltage has an automatic shaping function.
  • 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、全桥和半桥的智能型正弦波电压转换电路，其包括有：输入单元（10）；PFC升压单元（20）；全桥隔离变换单元（30），包括有第一开关管（Q6）、第二开关管（Q7）、第六开关管（Q8）、第七开关管（Q9）、变压器（T1）、第一二极管（D5）、第二二极管（D6）和第一滤波电感（L3），第六开关管的源极连接于变压器初级绕组的第一端，第二开关管的漏极连接于变压器初级绕组的第二端，第一开关管的源极连接于变压器初级绕组的第二端，第七开关管的漏极连接于变压器初级绕组的第一端，变压器次级绕组的中间抽头连接于后端地，第一滤波电感的后端和第二二极管的阳极作为全桥隔离变换单元的输出端；逆变倒相单元（40），其输出端设有第二滤波电感（L4）。该智能型正弦波电压转换电路可提高PF值和输出电压质量。

Description

基于PFC、全桥和半桥的智能型正弦波电压转换电路
技术领域
本发明涉及电压转换电路，尤其涉及一种基于PFC、全桥和半桥的智能型正弦波电压转换电路。
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。实际应用中，由于电压转换过程中存在开关管的高速切换，使得电路的输出侧会存在一定的高频脉冲信号，进而影响输出电压的质量，因而难以满足转换要求。
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，提供一种可提高电压转换装置的PF值、可提高输出电压质量，并且能够滤除输出侧的高频脉冲，进而为负载提供优质工频正弦交流电的智能型正弦波电压转换电路。
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、全桥和半桥的智能型正弦波电压转换电路，其包括有用于提供直流电压的输入单元、用于对输入单元的输出电压进行升压转换的PFC升压单元，以及：一全桥隔离变换单元，包括有第一开关管、第二开关管、第六开关管、第七开关管、变压器、第一二极管、第二二极管和第一滤波电感，所述第六开关管的漏极连接于PFC升压单元的输出端，所述第六开关管的源极连接于变压器初级绕组的第一端，所述第二开关管的漏极连接于变压器初级绕组的第二端，所述第二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PFC升压单元的输出端，所述第一开关管的源极连接于变压器初级绕组的第二端，所述第七开关管的漏极连接于变压器初级绕组的第一端，所述第七开关管的源极连接于前端地，所述第一开关管的栅极、第二开关管的栅极、第六开关管的栅极和第七开关管的栅极分别用于接入PWM脉冲信号，所述变压器次级绕组的中间抽头连接于后端地，所述变压器次级绕组的第一端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容连接于后端 地，且该第一二极管的阴极连接于第一滤波电感的前端，所述变压器次级绕组的第二端连接于第二二极管的阴极，所述第二二极管的阳极通过第二电容连接于后端地，所述第一滤波电感的后端和第二二极管的阳极作为全桥隔离变换单元的输出端；一逆变倒相单元，包括有第四开关管、第五开关管、第三电解电容、第四电解电容和第二滤波电感，所述第四开关管的漏极连接于全桥隔离变换单元的输出端正极，所述第四开关管的源极连接于第五开关管的漏极，所述第五开关管的源极连接于全桥隔离变换单元的输出端负极，所述第四开关管的栅极和第五开关管的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第三电解电容的正极连接于第四开关管的漏极，所述第三电解电容的负极连接后端地，所述第三电解电容的负极还连接于第四电解电容的正极，所述第四电解电容的负极连接于第五开关管的源极，所述第四开关管的源极连接于第二滤波电感的前端，所述第二滤波电感的后端和第三电解电容的负极作为逆变倒相单元的输出端。
优选地，所述第四开关管的栅极和源极之间连接有第一电阻，所述第五开关管的栅极和源极之间连接有第二电阻。
优选地，所述输入单元包括有插座、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，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、第三开关管的栅极、第六开关管的栅极和第七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、第三开关管、第六开关管和第七开关管，以控制第一开关管、第二开关管、第三开关管、第六开关管和第七开关管的通断状态。
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所述全桥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控制单元采集所述全桥隔离变换单元输出的电信号。
优选地，所述MCU控制单元包括有单片机及其外围电路。
本发明公开的基于PFC、全桥和半桥的智能型正弦波电压转换电路中，利用PFC升压单元对输入单元输出的直流电压进行升压处理，之后输出至全桥隔离变换单元，在全桥隔离变换单元中，当第一开关管和第七开关管导通时，电流由第一开关管、变压器初级线圈、第七开关管到前端地形成回路，变压器初级绕组的电压为下正上负，然后通过变压器磁芯藕合至变压器次级，第二二极管通过反向电压传送给第二电容滤波，在第二电容上形成上正下负的直流电压；当第二开关管和第六开关管导通时，电流由第二开关管、变压器初级线圈、第六开关管到前端地形成回路，变压器初级绕组电压为上正下负，然后通过变压器磁芯藕合至变压器次级，这时通过第一二极管的电压为正向电压，且传送至第一电容，在第一电容上形成上正下负的直流电压，这样在直流母线上就形成了正负电压。其中，第一电容、第二电容和第一滤波电感组成滤波电路。并通过改变变压器初次级的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元的输出端设置了第二滤波电感，利用第二滤波电感可滤除逆变倒相单元输出信号中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。
附图说明
图1为本发明正弦波电压转换电路的原理图。
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、全桥和半桥的智能型正弦波电压转换电路，结合图1至图3所示，其包括有用于提供直流电压的输入单元10、用于对输入单元10的输出电压进行升压转换的PFC升压单元20，以及：
一全桥隔离变换单元30，包括有第一开关管Q6、第二开关管Q7、第六开关管Q8、第七开关管Q9、变压器T1、第一二极管D5、第二二极管D6和第一滤波电感L3，所述第六开关管Q8的漏极连接于PFC升压单元20的输出端，所述第六开关管Q8的源极连接于变压器T1初级绕组的第一端，所述第二开关管Q7的漏极连接于变压器T1初级绕组的第二端，所述第二开关管Q7的源极连接于前端地，所述第一开关管Q6的漏极连接于PFC升压单元20的输出端，所述第一开关管Q6的源极连接于变压器T1初级绕组的第二端，所述第七开关管Q9的漏极连接于变压器T1初级绕组的第一端，所述第七开关管Q9的源极连接于前端地，所述第一开关管Q6的栅极、第二开关管Q7的栅极、第六开关管Q8的栅极和第七开关管Q9的栅极分别用于接入PWM脉冲信号，所述变压器T1次级绕组的中间抽头连接于后端地，所述变压器T1次级绕组的第一端连接于第一二极管D5的阳极，所述第一二极管D5的阴极通过第一电容C7连接于后端地，且该第一二极管D5的阴极连接于第一滤波电感L3的前端，所述变压器T1次级绕组的第二端连接于第二二极管D6的阴极，所述第二二极管D6的阳极通过第二电容C8连接于后端地，所述第一滤波电感L3的后端和第二二极管D6的阳极作为全桥隔离变换单元30的输出端；
一逆变倒相单元40，包括有第四开关管Q2、第五开关管Q4、第三电解电容C3、第四电解电容C5和第二滤波电感L4，所述第四开关管Q2的漏极连接于全桥隔离变换单元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的源极连接于全桥隔离变换单元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C5的正极，所述第四电解电容C5的负极连接于第五开关管Q4的源极，所述第四开关管Q2的源极连接于第二滤波电感L4的前端，所述第二滤波电感L4的后端和第三电解电容C3的负极作为逆变倒相单元40的输出端。
上述正弦波电压转换电路中，利用PFC升压单元20对输入单元10输出的直流电压进行升压处理，之后输出至全桥隔离变换单元30，在全桥隔离变换单元30中，当第一开关管Q6和第七开关管Q9导通时，电流由第一开关管Q6、变压器T1初级线圈、第七开关管Q9到前端地形成回路，变压器T1初级绕组的电压为下正上负，然后通过变压器T1磁芯藕合至变压器次级，第二二极管D6通过反向电压传送给第二电容C8滤波，在第二电容C8上形成上正下负的直流电压；当第二开关管Q7和第六开关管Q8导通时，电流由第二开关管Q7、变压器T1初级线圈、第六开关管Q8到前端地形成回路，变压器T1初级绕组电压为上正下负，然后通过变压器T1磁芯藕合至变压器次级，这时通过第一二极管D5的电压为正向电压，且传送至第一电容C7，在第一电容C7上形成上正下负的直流电压，这样在直流母线上就形成了正负电压。其中，第一电容C7、第二电容C8和第一滤波电感L3组成滤波电路。并通过改变变压器T1初次级的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元40的输出端设置了第二滤波电感L4，利用第二滤波电感L4可滤除逆变倒相单元输出信号中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。
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40中，当第四开关管Q2导通时，第四开关管Q2、负载、第四电解电容C5形成回路，产生第一个高频脉冲电平给负载，当第四开关管Q2关闭时，通过第四电解电容C5、第五开关管Q4的体二极管、第二滤波电感L4形成续流回路；当第五开关管Q4导通时通过第五开关管Q4、负载、第三电解电容C3形成回路，在负载上就形成了第二个高频脉冲电平，当第五开关管Q4关断时，第四开关管Q2的体二极管、第三电解电容C3、负载、第二滤波电感L4形成续流回路。第四开关管Q2、第五开关管Q4的高频驱动PWM信号经工频正弦调制变化后再送给第四开关管Q2、第五开关管Q4的GATE极。第四开关管Q2、第五开关管Q4驱动信号是经工频调制的，流经第四开关管Q2、第五开关管Q4的电流是按正弦变化的。由于第二滤波电感L4对高频脉冲具有高阻抗特性，所以高频分量被第二滤波电感L4滤除，在负载上就形成了工频正弦交流电压。同时第三电解电容C3、第四电解电容C5还有滤波的作用，可以与第一滤波电感L3组成直流滤波电路。本逆变电路控制简单，电路只用两个MOS管，成本低廉。
关于输入部分，如图1所述，所述输入单元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，所述整流桥DB1的输出端并联有滤波电容C1。
本实施例中，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中，若滤波电容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、第三开关管Q5的栅极、第六开关管Q8的栅极和第七开关管Q9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、第三开关管Q5、第六开关管Q8和第七开关管Q9，以控制第一开关管Q6、第二开关管Q7、第三开关管Q5、第六开关管Q8和第七开关管Q9的通断状态。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，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的前端连接于所述全桥隔离变换单元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采集所述全桥隔离变换单元30输出的电信号。
本发明公开的基于PFC、全桥和半桥的智能型正弦波电压转换电路，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，并且输出电压是以正弦波输出，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、全桥和半桥的智能型正弦波电压转换电路，其特征在于，包括有用于提供直流电压的输入单元(10)、用于对输入单元(10)的输出电压进行升压转换的PFC升压单元(20)，以及：
    一全桥隔离变换单元(30)，包括有第一开关管(Q6)、第二开关管(Q7)、第六开关管(Q8)、第七开关管(Q9)、变压器(T1)、第一二极管(D5)、第二二极管(D6)和第一滤波电感(L3)，所述第六开关管(Q8)的漏极连接于PFC升压单元(20)的输出端，所述第六开关管(Q8)的源极连接于变压器(T1)初级绕组的第一端，所述第二开关管(Q7)的漏极连接于变压器(T1)初级绕组的第二端，所述第二开关管(Q7)的源极连接于前端地，所述第一开关管(Q6)的漏极连接于PFC升压单元(20)的输出端，所述第一开关管(Q6)的源极连接于变压器(T1)初级绕组的第二端，所述第七开关管(Q9)的漏极连接于变压器(T1)初级绕组的第一端，所述第七开关管(Q9)的源极连接于前端地，所述第一开关管(Q6)的栅极、第二开关管(Q7)的栅极、第六开关管(Q8)的栅极和第七开关管(Q9)的栅极分别用于接入PWM脉冲信号，所述变压器(T1)次级绕组的中间抽头连接于后端地，所述变压器(T1)次级绕组的第一端连接于第一二极管(D5)的阳极，所述第一二极管(D5)的阴极通过第一电容(C7)连接于后端地，且该第一二极管(D5)的阴极连接于第一滤波电感(L3)的前端，所述变压器(T1)次级绕组的第二端连接于第二二极管(D6)的阴极，所述第二二极管(D6)的阳极通过第二电容(C8)连接于后端地，所述第一滤波电感(L3)的后端和第二二极管(D6)的阳极作为全桥隔离变换单元(30)的输出端；
    一逆变倒相单元(40)，包括有第四开关管(Q2)、第五开关管(Q4)、第三电解电容(C3)、第四电解电容(C5)和第二滤波电感(L4)，所述第四开关管(Q2)的漏极连接于全桥隔离变换单元(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)的源极连接于全桥隔离变换单元(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(C5)的正极，所述第四电解电容(C5)的负极连接于第五开关管(Q4)的源极，所述第四开关管(Q2)的源极连接于第二滤波电感(L4)的前端，所述第二滤波电感(L4)的后端和第三电解电容(C3)的负极作为逆变倒相单元(40)的输出端。
  2. 如权利要求1所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，其特征在 于，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)。
  3. 如权利要求1所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，其特征在于，所述输入单元(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，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、全桥和半桥的智能型正弦波电压转换电路，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、全桥和半桥的智能型正弦波电压转换电路，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、第三开关管(Q5)的栅极、第六开关管(Q8)的栅极和第七开关管(Q9)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)、第三开关管(Q5)、第六开关管(Q8)和第七开关管(Q9)，以控制第一开关管(Q6)、第二开关管(Q7)、第三开关管(Q5)、第六开关管(Q8)和第七开关管(Q9)的通断状态。
  6. 如权利要求5所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，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)用于采集输入单元(10)交流侧的电压并反馈至MCU控制单元(80)。
  7. 如权利要求6所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，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)。
  8. 如权利要求5所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，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。
  9. 如权利要求5所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，其特征在于，还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)的前端连接于所述全桥隔离变换单元(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)采集所述全桥隔离变换单元(30)输出的电信号。
  10. 如权利要求5所述的基于PFC、全桥和半桥的智能型正弦波电压转换电路，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。
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