WO2018120522A1 - Circuit de conversion de tension d'onde sinusoïdale modifié intelligent basé sur un demi-pont de conversion directe pfc - Google Patents

Circuit de conversion de tension d'onde sinusoïdale modifié intelligent basé sur un demi-pont de conversion directe pfc Download PDF

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Publication number
WO2018120522A1
WO2018120522A1 PCT/CN2017/080987 CN2017080987W WO2018120522A1 WO 2018120522 A1 WO2018120522 A1 WO 2018120522A1 CN 2017080987 W CN2017080987 W CN 2017080987W WO 2018120522 A1 WO2018120522 A1 WO 2018120522A1
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Prior art keywords
switching transistor
diode
unit
pfc
switch
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PCT/CN2017/080987
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English (en)
Chinese (zh)
Inventor
侯涛
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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Publication of WO2018120522A1 publication Critical patent/WO2018120522A1/fr

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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
    • 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
    • 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
    • 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
    • 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 correction wave voltage conversion circuit based on a PFC forward half bridge.
  • the intelligent buck-boost conversion device from AC to AC is also called a travel plug.
  • the modified wave voltage conversion circuit is a key circuit thereof, and is a circuit capable of realizing AC-AC conversion. It can realize the function of buck-boost and stabilize voltage and frequency in AC-AC conversion.
  • 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.
  • the technical problem to be solved by the present invention is to provide an intelligent correction wave voltage based on a PFC forward half bridge which can improve the PF value of the voltage conversion device, improve the output voltage quality, and is safe and reliable in view of the deficiencies of the prior art. Conversion circuit.
  • the present invention adopts the following technical solutions.
  • An intelligent correction wave voltage conversion circuit based on PFC forward half bridge includes: an input rectification filtering unit, wherein an input end is connected to the power grid for rectifying and filtering the grid voltage; a PFC boosting unit is connected The output end of the input rectifying and filtering unit is configured to perform boost conversion on the output voltage of the input rectifying and filtering unit; and an isolated double-switch forward converter includes a first switching tube, a second switching tube, and a first diode a diode, a second diode, a third diode, a fourth diode, a transformer, and a filter inductor, wherein a drain of the first switch is connected to an output of the PFC boost unit, the first switch a source is connected to the first end of the primary winding of the transformer, a second end of the primary winding of the transformer is connected to a drain of the second switching transistor, a source of the second switching transistor is connected to the front end, the first diode a cathode of the tube is connected
  • 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
  • the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor
  • the input ends of the safety capacitor and the rectifier bridge are both connected in parallel to the rear end of the common mode suppression inductor, and 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 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 a rear end of the filter inductor, The back end of the third sampling resistor is connected to the MCU control unit, and the MCU control unit collects the electrical signal of the back end of the filter inductor by the second sampling resistor and the third sampling resistor.
  • 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 a rear end of the filter inductor, The back end of the third sampling resistor is connected to the MCU control unit, and the MCU control unit collects the electrical signal of the back end of the filter inductor by the second sampling resistor and the third sampling resistor.
  • the inverter inverter unit includes a fourth switch tube, a fifth switch tube, a third electrolytic capacitor, and a fourth An electrolytic capacitor, a drain of the fourth switch is connected to an anode of an output of the isolated double-switch forward converter, and a source of the fourth switch is connected to a drain of the fifth switch, the fifth The source of the switch tube is connected to the negative terminal of the output of the isolated double-tube forward converter, and the gate of the fourth switch tube and the gate of the fifth switch tube are respectively used to access two PWM pulse signals with opposite phases
  • the anode of the third electrolytic capacitor is connected to the drain of the fourth switching transistor, the cathode of the third electrolytic capacitor is connected to the rear end, and the cathode of the third electrolytic capacitor is also connected to the anode of the fourth electrolytic capacitor.
  • the cathode of the fourth electrolytic capacitor is connected to the source of the fifth switching transistor, and the source of the fourth switching transistor and the cathode of the third electrolytic capacitor are used as
  • 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 rectification filtering unit is used for rectifying and filtering the grid voltage, and then outputting the pulsating DC voltage, and then using the PFC boosting unit to increase the pulsating DC voltage.
  • the gate of the first switching transistor and the gate of the second switching transistor are used to access the same PWM signal, and the first switching transistor and the second switching transistor are simultaneously guided. Passing, the primary coil of the transformer is coupled to the secondary two coils via the magnetic core, and one of the two secondary coils is connected to the opposite end of the other coil through the third diode and the fourth diode.
  • a positive and negative bus voltage is formed, and the filter inductor is filtered into a DC output to the inverter inverting unit; when the first switch tube and the second switch tube are turned off, in order to keep the current direction of the primary coil of the transformer the same, at this time A diode and a second diode start to work and magnetically reset the core.
  • the secondary voltage can be made lower or higher than the primary input voltage. Or boost purposes.
  • the invention not only realizes the isolated transmission of voltage, but also effectively improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, so that the voltage conversion process is more safe and reliable.
  • FIG. 1 is a circuit schematic diagram of an input rectification filtering unit and a PFC boosting unit.
  • Figure 2 is a circuit schematic of an isolated two-switch forward converter and a DC voltage sampling unit.
  • FIG. 3 is a circuit schematic diagram of an inverter inverter unit.
  • FIG. 4 is a circuit schematic diagram of an AC sampling unit.
  • Figure 5 is a circuit schematic of the MCU control unit.
  • the invention discloses an intelligent correction wave voltage conversion circuit based on a PFC forward half bridge, which is combined with FIG. 1 to As shown in 5, it 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 isolated double-switch forward converter 30 includes a first switching transistor Q6, a second switching transistor Q7, a first diode D3, a second diode D2, a third diode D5, and a fourth diode
  • the tube D8, the transformer T1 and the filter inductor L3, the drain of the first switch tube Q6 is connected to the output end of the PFC boost unit 20, and the source of the first switch tube Q6 is connected to the first of the primary winding of the transformer T1.
  • the second end of the primary winding of the transformer T1 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 cathode of the first diode D3 is connected to the first a drain of the switch transistor Q6, an anode of the first diode D3 is connected to a second end of the primary winding of the transformer T1, and a cathode of the second diode D2 is connected to a first end of the primary winding of the transformer T1.
  • the anode of the second diode D2 is connected to the source of the second switching transistor Q7, and the gate of the first switching transistor Q6 and the gate of the second switching transistor Q7 are used to access the same PWM signal.
  • the middle tap of the primary winding of the transformer T1 is connected to the back end, and the first end of the primary winding of the transformer T1 is connected to the third diode D5
  • the anode of the third diode D5 is connected to the front end of the filter inductor L3, and the rear end of the filter inductor L3 serves as the anode of the output of the isolated double-switch forward converter 30.
  • the primary winding of the transformer T1 The second end is connected to the cathode of the fourth diode D8, and the anode of the fourth diode D8 is used as the output terminal of the isolated double-tube forward converter 30;
  • An inverter inverting unit 60 is connected to the output end of the isolated double-switch forward converter 30, and the inverter inverting unit 60 is used for inverter-converting the output voltage of the isolated double-switch forward converter 30. After outputting AC power.
  • the input rectification and filtering unit 10 rectifies and filters the grid voltage, and then outputs a pulsating DC voltage, and then the PFC boosting unit 20 boosts the pulsating DC voltage, and the isolated double-tube forward
  • the gate of the first switching transistor Q6 and the gate of the second switching transistor Q7 are used to access the same PWM signal, and when the first switching transistor Q6 and the second switching transistor Q7 are simultaneously turned on, the transformer T1 is The primary coil is coupled to the secondary two coils via the magnetic core, and one of the secondary windings is connected to the opposite end of the other coil, and is rectified by the third diode D5 and the fourth diode D8.
  • the filter inductor L3 Forming a positive and negative bus voltage, and sending the filter inductor L3 to a DC output to the inverter inverting unit 60; when the first switch tube Q6 and the second switch tube Q7 are turned off, in order to keep the current direction of the primary coil of the transformer T1 the same, At this time, the first diode D3 and the second diode D2 start to work, and the magnetic core is magnetically reset.
  • the secondary voltage can be made lower or higher than the primary input voltage. Buck or Press purposes.
  • the invention not only realizes the isolated transmission of voltage, but also effectively improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, so that the voltage conversion process is more safe and reliable.
  • the input rectification filtering unit 10 includes a socket, an insurance F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1.
  • 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 safety capacitor CX1 and the rectifier bridge DB1 are connected.
  • the input ends are all connected in parallel to the rear end of the common mode suppression inductor L1, and the output terminal of the rectifier bridge DB1 is connected with a filter capacitor C1 in parallel.
  • 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 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 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 input AC sine wave change obtained by the control chip, so that the current and the voltage phase are consistent 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.
  • FIG. 4 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 unit 70 is configured to collect the voltage of the AC side of the input rectification and 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 40, and the DC voltage sampling unit 40 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 rear end of the filter inductor L3, 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 are connected.
  • R15 causes the MCU control unit 80 to acquire an electrical signal at the rear end of the filter inductor L3.
  • 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.
  • the fourth switching transistor The drain of Q2 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.
  • the pole is connected to the negative terminal of the output of the isolated double-switch forward converter 30, and the gate of the fourth switch transistor Q2 and the gate of the fifth switch transistor Q4 are respectively used to access two PWM pulse signals with 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.
  • the anode of the fourth electrolytic capacitor C4 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 are used as the inverter inverting unit 60. Output.
  • 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 filter inductor L3 filters the inductor into a DC voltage
  • the fourth switch tube Q2, the load, and the fourth electrolytic capacitor C4 form a loop to supply power to the load to form a first half-cycle correction wave level
  • the periodic correction string 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.
  • the third electrolytic capacitor C3 and the fourth electrolytic capacitor C4 also have a filtering function, and can form a filtering circuit with the filter inductor L3.
  • the inverter circuit is simple to control, and the circuit uses only two MOS tubes, and the cost is low.
  • the intelligent modified wave voltage conversion circuit based on PFC forward 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 safety.
  • the output voltage can be automatically adjusted within the input full voltage range, the output frequency can be fixed, and the output voltage is the corrected wave output, and the AC voltage is automatically shaped.
  • the present invention The circuit is simple, easy to control, and contains voltage and current sampling circuits to prevent surge voltage and current.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

La présente invention concerne un circuit de conversion de tension d'onde sinusoïdale modifié intelligent basé sur un demi-pont de conversion directe PFC. Le circuit comprend : une unité de redressement et de filtrage d'entrée (10) ; une unité d'amplification PFC (20) ; un convertisseur direct à deux transistors d'isolation (30) comprenant un premier transistor de commutation (Q6), un second transistor de commutation (Q7), une première diode (D3), une deuxième diode (D2), une troisième diode (D5), une quatrième diode (D8), un transformateur (T1) et un inducteur de filtrage (L3), une source du premier transistor de commutation (Q6) étant connectée à une première extrémité d'un enroulement primaire du transformateur (T1), une seconde extrémité de l'enroulement primaire du transformateur (T1) étant connectée à un drain du second transistor de commutation (Q7), des grilles du premier transistor de commutation (Q6) et du second transistor de commutation (Q7) servant à une connexion à un même signal PWM, une première extrémité d'un enroulement secondaire du transformateur (T1) étant connectée à une anode de la seconde diode (D5), une extrémité arrière de la bobine d'induction de filtrage (L3) étant utilisée en tant qu'extrémité de sortie positive du convertisseur direct à deux transistors d'isolation (30), et une anode de la quatrième diode (D8) servant d'extrémité de sortie négative du convertisseur direct à deux transistors d'isolation (30) ; et une unité d'onduleur à inversion de phase (60). La présente invention améliore une valeur PF et la qualité d'une tension de sortie.
PCT/CN2017/080987 2016-12-27 2017-04-19 Circuit de conversion de tension d'onde sinusoïdale modifié intelligent basé sur un demi-pont de conversion directe pfc WO2018120522A1 (fr)

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