WO2018120522A1 - Pfc forward conversion half bridge-based smart modified sine wave voltage conversion circuit - Google Patents

Pfc forward conversion half bridge-based smart modified sine wave voltage conversion circuit 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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French (fr)
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/en

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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

A PFC forward conversion half bridge-based smart modified sine wave voltage conversion circuit. The circuit comprises: an input rectifying and filtering unit (10); a PFC boosting unit (20); an isolation two-transistor forward converter (30) comprising a first switch transistor (Q6), a second switch transistor (Q7), a first diode (D3), a second diode (D2), a third diode (D5), a fourth diode (D8), a transformer (T1), and a filtering inductor (L3), wherein a source of the first switch transistor (Q6) is connected to a first end of a primary winding of the transformer (T1), a second end of the primary winding of the transformer (T1) is connected to a drain of the second switch transistor (Q7), gates of the first switch transistor (Q6) and the second switch transistor (Q7) are used to connect to a same PWM signal, a first end of a secondary winding of the transformer (T1) is connected to an anode of the second diode (D5), a rear end of the filtering inductor (L3) is used as a positive output end of the isolation two-transistor forward converter (30), and an anode of the fourth diode (D8) is used as a negative output end of the isolation two-transistor forward converter (30); and a phase-inversion inverter unit (60). The present invention improves a PF value and the quality of an output voltage.

Description

一种基于PFC正激半桥的智能型修正波电压转换电路Intelligent correction wave voltage conversion circuit based on PFC forward half bridge
技术领域Technical field
本发明涉及电压转换电路，尤其涉及一种基于PFC正激半桥的智能型修正波电压转换电路。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.
背景技术Background technique
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，修正波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。In the prior art, the intelligent buck-boost conversion device from AC to AC is also called a travel plug. In this device, 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. However, 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.
发明内容Summary of the invention
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，并且安全可靠的基于PFC正激半桥的智能型修正波电压转换电路。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.
为解决上述技术问题，本发明采用如下技术方案。In order to solve the above technical problems, the present invention adopts the following technical solutions.
一种基于PFC正激半桥的智能型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；一隔离型双管正激变换器，包括有第一开关管、第二开关管、第一二极管、第二二极管、第三二极管、第四二极管、变压器和滤波电感，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一端，所述变压器初级绕组的第二端连接第二开关管的漏极，所述第二开关管的源极连接前端地，所述第一二极管的阴极连接于第一开关管的漏极，所述第一二极管的阳极连接于变压器初级绕组的第二端，所述第二二极管的阴极连接于变压器初级绕组的第一端，所述第二二极管的阳极连接于第二开关管的源极，所述第一开关管的栅极和第二开关管的栅极用于接入相同的PWM信号，所述变压器初级绕组的中间抽头连接于后端地，所述变压器初级绕组的第一端连接于第三二极管的阳极，所述第三二极管的阴极连接于滤波电感的前端，所述滤波电感的后端作为隔离型双管正激变换器的输出端正极，所述变压器初级绕组的第二端连接于第四二极管的阴极，所述第四二极管的阳 极作为隔离型双管正激变换器的输出端负极；一逆变倒相单元，连接于隔离型双管正激变换器的输出端，所述逆变倒相单元用于对隔离型双管正激变换器的输出电压进行逆变转换后输出交流电。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 to the drain of the first switching transistor, an anode of the first diode is connected to the second end of the primary winding of the transformer, and a cathode of the second diode is connected to the first end of the primary winding of the transformer The second two The anode of the tube is connected to the source of the second switching tube, the gate of the first switching tube and the gate of the second switching tube are used to access the same PWM signal, and the middle tap of the primary winding of the transformer is connected to the rear Terminally, a first end of the transformer primary winding is connected to an anode of the third diode, a cathode of the third diode is connected to a front end of the filter inductor, and a rear end of the filter inductor is used as an isolated double tube The output of the forward converter is positive, the second end of the primary winding of the transformer is connected to the cathode of the fourth diode, and the anode of the fourth diode The pole is used as an output terminal of the isolated double-switch forward converter; an inverter inverter unit is connected to the output end of the isolated double-tube forward converter, and the inverter inverter unit is used for the isolated double pipe The output voltage of the forward converter is inverted and converted to output AC power.
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，所述整流桥的输出端并联有滤波电容。Preferably, 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, and 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 There is a filter capacitor in parallel.
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。Preferably, 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.
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。Preferably, 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.
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。Preferably, 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.
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。Preferably, 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. .
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。Preferably, 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.
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滤波电感的后端，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控制单元采集滤波电感后端的电信号。Preferably, 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.
优选地，所述逆变倒相单元包括有第四开关管、第五开关管、第三电解电容和第四 电解电容，所述第四开关管的漏极连接于隔离型双管正激变换器的输出端正极，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隔离型双管正激变换器的输出端负极，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和第三电解电容的负极作为逆变倒相单元的输出端。Preferably, 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 the output ends of the inverter inverting unit.
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。Preferably, 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.
本发明公开的基于PFC正激半桥的智能型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，在隔离型双管正激变换器中，第一开关管的栅极和第二开关管的栅极用于接入相同的PWM信号，当第一开关管与第二开关管同时导通，变压器的初级线圈经过磁芯藕合至次级两个线圈，次级两个线圈中的一个同名端与另一个线圈的异端连在一起，通过第三二极管、第四二极管整流后形成正负母线电压，送给滤波电感滤波成直流输出给逆变倒相单元；当第一开关管与第二开关管关断时，为了保持变压器的初级线圈电流方向相同，此时第一二极管和第二二极管开始工作，并对磁芯进行磁复位，通过改变变压器初次级的匝比可以使次级电压低于或高于初级输入电压，达到降压或升压目的。本发明不仅实现了电压的隔离传输，有效提高升压/降压转换装置的PF值，同时还提高了输出电压质量，使得电压转换过程更加安全可靠。In the intelligent modified wave voltage conversion circuit based on PFC forward half bridge disclosed by the invention, 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. In the isolated double-switch forward converter, 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. After rectification, 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. By changing the turns ratio of the primary and secondary of the transformer, 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.
附图说明DRAWINGS
图1为输入整流滤波单元和PFC升压单元的电路原理图。FIG. 1 is a circuit schematic diagram of an input rectification filtering unit and a PFC boosting unit.
图2为隔离型双管正激变换器和DC电压采样单元的电路原理图。Figure 2 is a circuit schematic of an isolated two-switch forward converter and a DC voltage sampling unit.
图3为逆变倒相单元的电路原理图。3 is a circuit schematic diagram of an inverter inverter unit.
图4为交流采样单元的电路原理图。4 is a circuit schematic diagram of an AC sampling unit.
图5为MCU控制单元的电路原理图。Figure 5 is a circuit schematic of the MCU control unit.
具体实施方式detailed description
下面结合附图和实施例对本发明作更加详细的描述。The invention will now be described in greater detail with reference to the drawings and embodiments.
本发明公开了一种基于PFC正激半桥的智能型修正波电压转换电路，结合图1至图 5所示，其包括有：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:
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；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;
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；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;
一隔离型双管正激变换器30，包括有第一开关管Q6、第二开关管Q7、第一二极管D3、第二二极管D2、第三二极管D5、第四二极管D8、变压器T1和滤波电感L3，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初级绕组的第一端，所述变压器T1初级绕组的第二端连接第二开关管Q7的漏极，所述第二开关管Q7的源极连接前端地，所述第一二极管D3的阴极连接于第一开关管Q6的漏极，所述第一二极管D3的阳极连接于变压器T1初级绕组的第二端，所述第二二极管D2的阴极连接于变压器T1初级绕组的第一端，所述第二二极管D2的阳极连接于第二开关管Q7的源极，所述第一开关管Q6的栅极和第二开关管Q7的栅极用于接入相同的PWM信号，所述变压器T1初级绕组的中间抽头连接于后端地，所述变压器T1初级绕组的第一端连接于第三二极管D5的阳极，所述第三二极管D5的阴极连接于滤波电感L3的前端，所述滤波电感L3的后端作为隔离型双管正激变换器30的输出端正极，所述变压器T1初级绕组的第二端连接于第四二极管D8的阴极，所述第四二极管D8的阳极作为隔离型双管正激变换器30的输出端负极；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;
一逆变倒相单元60，连接于隔离型双管正激变换器30的输出端，所述逆变倒相单元60用于对隔离型双管正激变换器30的输出电压进行逆变转换后输出交流电。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.
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，在隔离型双管正激变换器30中，第一开关管Q6的栅极和第二开关管Q7的栅极用于接入相同的PWM信号，当第一开关管Q6与第二开关管Q7同时导通，变压器T1的初级线圈经过磁芯藕合至次级两个线圈，次级两个线圈中的一个同名端与另一个线圈的异端连在一起，通过第三二极管D5、第四二极管D8整流后形成正负母线电压，送给滤波电感L3滤波成直流输出给逆变倒相单元60；当第一开关管Q6与第二开关管Q7关断时，为了保持变压器T1的初级线圈电流方向相同，此时第一二极管D3和第二二极管D2开始工作，并对磁芯进行磁复位，通过改变变压器T1初次级的匝比可以使次级电压低于或高于初级输入电压，达到降压或升压目的。本发明不仅实现了电压的隔离传输，有效提高升压/降压转换装置的PF值，同时还提高了输出电压质量，使得电压转换过程更加安全可靠。 In the correction wave voltage conversion circuit, 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 In the converter 30, 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. 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. By changing the turns ratio of the primary and secondary of the transformer T1, 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.
作为一种优选方式，请参照图1，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，所述整流桥DB1的输出端并联有滤波电容C1。As a preferred manner, referring to FIG. 1 , 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. Connected to the neutral or the live line of the socket, 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.
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。In this embodiment, 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 For connecting a PWM control signal, the drain of the third switching transistor Q5 is connected to the anode of the first rectifier diode D1, and the cathode of the first rectifier diode D1 is used as an output terminal of the PFC boosting unit 20, and 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.
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正弦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。In 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.
作为一种优选方式，请参照图5，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。As a preferred manner, referring to FIG. 5, 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. Connected to the MCU control unit 80, 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.
为了便于监测交流侧的电信号，请参照图4，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。In order to facilitate the monitoring of the electrical signal on the AC side, please refer to FIG. 4, which 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.
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。 Further, 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.
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。In order to facilitate real-time acquisition of the current, 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.
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40，所述DC电压采样单元40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的前端连接于滤波电感L3的后端，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采集滤波电感L3后端的电信号。As a preferred manner, in order to collect the DC side electrical signal, 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.
关于逆变部分，请参照图3，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。Referring to FIG. 3, 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.
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。Further, 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.
上述逆变电路中，经过滤波电感L3滤波电感滤成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，可以与滤波电感L3组成滤波电路。本逆变电路控制简单，电路只用两个MOS管，成本低廉。In the above inverter circuit, the filter inductor L3 filters the inductor into a DC voltage, and 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 second half 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. After the PWM signal outputted by the control chip passes through the driving circuit, 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. At the same time, 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.
本发明公开的基于PFC正激半桥的智能型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。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. In addition, the present invention The circuit is simple, easy to control, and contains voltage and current sampling circuits to prevent surge voltage and current.
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。 The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalents, and improvements made within the technical scope of the present invention are intended to be included within the scope of the present invention.

Claims (10)

  1. 一种基于PFC正激半桥的智能型修正波电压转换电路，其特征在于，包括有：An intelligent correction wave voltage conversion circuit based on a PFC forward half bridge, characterized in that it comprises:
    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；An input rectifying and filtering unit (10), the input end of which is connected to the power grid for rectifying and filtering the grid voltage;
    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；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);
    一隔离型双管正激变换器(30)，包括有第一开关管(Q6)、第二开关管(Q7)、第一二极管(D3)、第二二极管(D2)、第三二极管(D5)、第四二极管(D8)、变压器(T1)和滤波电感(L3)，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)初级绕组的第一端，所述变压器(T1)初级绕组的第二端连接第二开关管(Q7)的漏极，所述第二开关管(Q7)的源极连接前端地，所述第一二极管(D3)的阴极连接于第一开关管(Q6)的漏极，所述第一二极管(D3)的阳极连接于变压器(T1)初级绕组的第二端，所述第二二极管(D2)的阴极连接于变压器(T1)初级绕组的第一端，所述第二二极管(D2)的阳极连接于第二开关管(Q7)的源极，所述第一开关管(Q6)的栅极和第二开关管(Q7)的栅极用于接入相同的PWM信号，所述变压器(T1)初级绕组的中间抽头连接于后端地，所述变压器(T1)初级绕组的第一端连接于第三二极管(D5)的阳极，所述第三二极管(D5)的阴极连接于滤波电感(L3)的前端，所述滤波电感(L3)的后端作为隔离型双管正激变换器(30)的输出端正极，所述变压器(T1)初级绕组的第二端连接于第四二极管(D8)的阴极，所述第四二极管(D8)的阳极作为隔离型双管正激变换器(30)的输出端负极；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), and a a three diode (D5), a fourth diode (D8), a transformer (T1), and a filter inductor (L3), the drain of the first switch transistor (Q6) being connected to the PFC boost unit (20) The output end, the source of the first switch tube (Q6) is connected to the first end of the primary winding of the transformer (T1), and the second end of the primary winding of the transformer (T1) is connected to the drain of the second switch tube (Q7) a diode, a source of the second switching transistor (Q7) is connected to the front end, a cathode of the first diode (D3) is connected to a drain of the first switching transistor (Q6), the first diode The anode of (D3) is connected to the second end of the primary winding of the transformer (T1), and the cathode of the second diode (D2) is connected to the first end of the primary winding of the transformer (T1), the second diode The anode of (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. a middle tap of the primary winding of the transformer (T1) is connected to the rear end, the transformer (T1) the first end of the primary winding is connected to the anode of the third diode (D5), and the cathode of the third diode (D5) is connected to the front end of the filter inductor (L3), the filter inductor (L3) The back end of the transformer is the positive terminal of the output of the isolated double-switch forward converter (30), and the second end of the primary winding of the transformer (T1) is connected to the cathode of the fourth diode (D8), the fourth The anode of the diode (D8) serves as the output terminal of the isolated double-tube forward converter (30);
    一逆变倒相单元(60)，连接于隔离型双管正激变换器(30)的输出端，所述逆变倒相单元(60)用于对隔离型双管正激变换器(30)的输出电压进行逆变转换后输出交流电。An inverter inverter unit (60) is connected to the output end of the isolated double-switch forward converter (30), and the inverter inverter unit (60) is used for the isolated double-tube forward converter (30) The output voltage is inverted and converted to output AC power.
  2. 如权利要求1所述的基于PFC正激半桥的智能型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，所述整流桥(DB1)的输出端并联有滤波电容(C1)。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 1, wherein the input rectification filtering unit (10) comprises a socket, a fuse (F2), and 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 a neutral or a live line of the socket, and the front end of the common mode suppression inductor (L1) Parallel to the socket, the lightning protection resistor (RV1) is connected in parallel with 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 connected in parallel to the common mode suppression inductor (L1). The back end of the rectifier bridge (DB1) has a filter capacitor (C1) connected in parallel.
  3. 如权利要求1所述的基于PFC正激半桥的智能型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。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 1, wherein the PFC boosting unit (20) comprises a boosting inductor (L2) and a third switching transistor (Q5). a first rectifier diode (D1) and a second electrolytic capacitor (C2), the front end of the boosting inductor (L2) being connected to an output of the input rectifying and filtering unit (10), the boosting inductor (L2) The back end is connected to the drain of the third switch tube (Q5), and the third switch tube (Q5) The source of the third switch (Q5) is used to connect a PWM control signal, and the drain of the third switch (Q5) is connected to the anode of the first rectifier diode (D1). The cathode of the first rectifier diode (D1) serves as an output terminal of the PFC boosting unit (20), and the cathode of the first rectifier diode (D1) is connected to the anode of the second electrolytic capacitor (C2), and the second electrolytic capacitor The negative electrode of (C2) is connected to the front end.
  4. 如权利要求3所述的基于PFC正激半桥的智能型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。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 3, further comprising an MCU control unit (80), a gate of the first switching transistor (Q6), The gates of the second switching transistor (Q7) and the gate of the third switching transistor (Q5) are respectively connected to the MCU control unit (80), and the MCU control unit (80) is configured to respectively output a PWM signal to the first switching transistor ( Q6), a second switch tube (Q7) and a third switch tube (Q5) to control the on/off state of the first switch tube (Q6), the second switch tube (Q7) and the third switch tube (Q5).
  5. 如权利要求4所述的基于PFC正激半桥的智能型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)。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 4, further comprising an AC sampling unit (70) connected to the input rectification filtering unit The input terminal of (10) is connected to the MCU control unit (80) for collecting the voltage of the AC side of the input rectification and filtering unit (10) and feeding back to the MCU control unit (80).
  6. 如权利要求5所述的基于PFC正激半桥的智能型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)。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 5, wherein said AC sampling unit (70) comprises an operational amplifier (U9B), said operational amplifier (U9B) The two input terminals are respectively connected to the input end of the input rectifying and filtering unit (10) through a current limiting resistor, and the output end of the operational amplifier (U9B) is connected to the MCU control unit (80).
  7. 如权利要求4所述的基于PFC正激半桥的智能型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。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 4, wherein a first sampling resistor is connected between a source and a front end of the third switching transistor (Q5) ( R2A), the source of the third switch tube (Q5) is connected to the MCU control unit (80), and the MCU control unit (80) acquires the third switch tube (Q5) by the first sampling resistor (R2A) ) The electrical signal of the source.
  8. 如权利要求4所述的基于PFC正激半桥的智能型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(40)，所述DC电压采样单元(40)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)的前端连接于滤波电感(L3)的后端，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)采集滤波电感(L3)后端的电信号。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 4, further comprising a DC voltage sampling unit (40), wherein the DC voltage sampling unit (40) comprises a series connection in sequence a second sampling resistor (R13) and a third sampling resistor (R15), the front end of the second sampling resistor (R13) is connected to the rear end of the filter inductor (L3), and the third sampling resistor (R15) is behind The terminal is connected to the MCU control unit (80), and the MCU control unit (80) acquires an electrical signal at the back end of the filter inductor (L3) by the second sampling resistor (R13) and the third sampling resistor (R15).
  9. 如权利要求4所述的基于PFC正激半桥的智能型修正波电压转换电路，其特征在于，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。The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 4, wherein the inverter inverting unit (60) comprises a fourth switching tube (Q2) and a fifth switching tube. (Q4), a third electrolytic capacitor (C3) and a fourth electrolytic capacitor (C4), the drain of the fourth switching transistor (Q2) is connected to the isolated double-tube forward converter (30) The output terminal is positive, the source of the fourth switch (Q2) is connected to the drain of the fifth switch (Q4), and the source of the fifth switch (Q4) is connected to the isolated double-tube forward The output terminal of the 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 first The anode of the three 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. In the positive electrode of the fourth electrolytic capacitor (C4), the negative electrode of the fourth electrolytic capacitor (C4) is connected to the source of the fifth switching transistor (Q4), the source of the fourth switching transistor (Q2), and the third The negative electrode of the electrolytic capacitor (C3) serves as the output terminal of the inverter inverter unit (60).
  10. 如权利要求9所述的基于PFC正激半桥的智能型修正波电压转换电路，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)。 The intelligent modified wave voltage conversion circuit based on PFC forward half bridge according to claim 9, wherein a first resistor (R17) is connected between the gate and the source of the fourth switching transistor (Q2). A second resistor (R23) is connected between the gate and the source of the fifth switching transistor (Q4).
PCT/CN2017/080987 2016-12-27 2017-04-19 Pfc forward conversion half bridge-based smart modified sine wave voltage conversion circuit WO2018120522A1 (en)

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