WO2018107619A1 - Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit - Google Patents

Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit Download PDF

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Publication number
WO2018107619A1
WO2018107619A1 PCT/CN2017/079185 CN2017079185W WO2018107619A1 WO 2018107619 A1 WO2018107619 A1 WO 2018107619A1 CN 2017079185 W CN2017079185 W CN 2017079185W WO 2018107619 A1 WO2018107619 A1 WO 2018107619A1
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Prior art keywords
unit
switch tube
switching transistor
pfc
bridge
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PCT/CN2017/079185
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French (fr)
Chinese (zh)
Inventor
侯涛
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广东百事泰电子商务股份有限公司
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Publication of WO2018107619A1 publication Critical patent/WO2018107619A1/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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to a voltage conversion circuit, in particular to an intelligent full bridge sine wave voltage conversion circuit based on PFC and LLC resonance.
  • the intelligent buck-boost conversion device from AC to AC is also called a travel strip.
  • the sine wave voltage conversion circuit topology is its key circuit, 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.
  • a certain high-frequency pulse signal exists on the output side of the circuit, thereby affecting the quality of the output voltage, and thus it is difficult to meet the conversion requirement.
  • the technical problem to be solved by the present invention is to provide an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance for improving the PF value of the voltage conversion device and improving the output voltage quality, and aiming at the deficiencies of the prior art. It can filter high frequency pulses on the output side to provide high quality power frequency sinusoidal AC power for the load.
  • the present invention adopts the following technical solutions.
  • An intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance comprising an input rectifying unit for rectifying a grid voltage, a filtering unit for filtering a voltage outputted by an input rectifying unit, and a filtering unit a PFC boosting unit for boosting the voltage outputted by the unit, and: an LLC isolated converter unit including a first switching transistor, a second switching transistor, a first freewheeling diode, a second freewheeling diode, a transformer, and a resonance a capacitor and a discharge resistor, a drain of the first switch tube is connected to an output end of the PFC boost unit, a source of the first switch tube is connected to a first end of the transformer, and a second end of the transformer is resonant a capacitor is connected to the front end, a drain of the second switch tube is connected to a source of the first switch tube, a source of the second switch tube is connected to a front end through a discharge resistor, and a gate of the first switch tube The gate of the second
  • the center tap of the secondary winding of the transformer acts as an LLC isolating converter
  • An output terminal of the unit a DC voltage filtering unit comprising a first electrolytic capacitor, an anode of the first electrolytic capacitor is connected to an output end of the LLC isolating converter unit, and a cathode of the first electrolytic capacitor is connected to a rear end;
  • An inverter inverter unit is connected to an output end of the LLC isolation converter unit, and the inverter inverter unit includes an inverter composed of a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube a bridge and a filter inductor, the gate of the fourth switch, the gate of the fifth switch, the gate of the sixth switch, and the gate of the seventh switch are respectively used to access the PWM control signal, and the control
  • the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned on or off, so that the inverter inverting unit outputs alternating current, and the output end of
  • the input rectifying unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppression inductor
  • the front end is connected in parallel to the socket, and the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor.
  • the input terminals 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 is used. The output is pulsating DC voltage.
  • the filtering unit comprises a filtering capacitor connected between the output end of the input rectifying unit and the front end ground.
  • the PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifier diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the filtering unit, the boosting inductor
  • the back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube
  • the drain is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.
  • a third pull-down resistor is connected between the gate of the third switch tube and the front end ground.
  • 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 And outputting a PWM signal to the first switch tube, the second switch tube and the third switch tube to control an on/off state of the first switch tube, the second switch tube and the third switch tube, wherein the MCU control unit is further used for inverting
  • the inverter unit outputs four PWM pulse signals to cause the inverter inverting unit to output an alternating current.
  • the method further includes an AC sampling unit connected between the input end of the input rectifying 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 unit and feed back to the MCU control. unit.
  • a first sampling resistor is connected between the source and the front end of the third switching tube, and the third switch
  • the source of the tube is connected to the MCU control unit, and the MCU control unit acquires an electrical signal of the source of the third switching tube by the first sampling resistor.
  • the method further includes a DC voltage sampling unit, the DC voltage sampling unit includes a second sampling resistor and a third sampling resistor connected in series, and a front end of the second sampling resistor is connected to an output of the LLC isolation converter unit.
  • the back end of the third sampling resistor is connected to the MCU control unit, and the MCU control unit acquires an electrical signal of the output of the LLC isolated converter unit by the second sampling resistor and the third sampling resistor.
  • a first pull-down resistor is connected between the gate and the source of the first switch, and a second pull-down resistor is connected between the gate and the source of the second switch.
  • the input rectifying unit rectifies the grid voltage, and then filters the pulsating DC voltage through the filtering unit, and then uses the PFC boosting unit to pulsate DC The voltage is boosted.
  • the LLC isolating converter unit the first switching transistor, the second switching transistor, the resonant capacitor, the discharge resistance and the leakage inductance of the primary side of the transformer and the primary exciting inductance constitute an LLC resonant circuit, and are resonant at LLC.
  • the power is transmitted to the secondary winding of the transformer, and is rectified into a unidirectional ripple level by the first freewheeling diode and the second freewheeling diode, and can be adjusted by changing the turns ratio of the primary winding of the transformer.
  • the output voltage is high or low, which in turn enables step-up or step-down conversion.
  • the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.
  • the invention provides a filter inductor at the output end of the inverter inverter unit, and the filter inductor can filter the high frequency pulse in the alternating current, so that the load can obtain high quality power frequency sinusoidal alternating current, thereby improving the output voltage quality. To meet the power supply needs.
  • FIG. 1 is a schematic diagram of a full bridge sinusoidal voltage conversion circuit of the present invention.
  • FIG. 2 is a circuit schematic diagram of an AC sampling unit in a preferred embodiment of the present invention.
  • FIG. 3 is a circuit schematic diagram of an MCU control unit in a preferred embodiment of the present invention.
  • the invention discloses an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3, and includes an input rectifying unit 10 for rectifying a grid voltage for rectifying an input.
  • the filtering unit 20 that filters the voltage output by the unit 10, the PFC boosting unit 30 that performs boost conversion on the voltage output by the filtering unit 20, and:
  • An LLC isolation converter unit 40 includes a first switching transistor Q6, a second switching transistor Q7, a first freewheeling diode D6, a second freewheeling diode D5, a transformer T1, a resonant capacitor C4, and a discharging resistor R2B.
  • the drain of a switch Q6 is connected to the output of the PFC boost unit 30.
  • the source of the first switch Q6 is connected to the first end of the transformer T1, and the second end of the transformer T1 is connected through the resonant capacitor C4.
  • the front end of the second switch tube Q7 has a drain connected to the source of the first switch tube Q6, and the source of the second switch tube Q7 is connected to the front end through a discharge resistor R2B, the first switch tube Q6
  • the gates of the gates and the second switching transistors Q7 are used to load two PWM pulse signals of opposite phases to alternately conduct the first switching transistor Q6 and the second switching transistor Q7, and the secondary winding of the transformer T1
  • the first end is connected to the anode of the first freewheeling diode D6, the second end of the secondary winding of the transformer T1 is connected to the anode of the second freewheeling diode D5, the cathode of the first freewheeling diode D6 and the second continuation
  • the cathode of the flow diode D5 is connected to the rear end ground, and the secondary winding of the transformer T1 Intermediate tap output of the isolation transformer as the LLC unit 40;
  • a DC voltage filtering unit 50 includes a first electrolytic capacitor C3, an anode of the first electrolytic capacitor C3 is connected to an output end of the LLC isolation converter unit 40, and a cathode of the first electrolytic capacitor C3 is connected to a rear end;
  • the inverter inverting unit 70 is connected to an output end of the LLC isolating converter unit 40.
  • the inverter inverting unit 70 includes a fourth switching tube Q1, a fifth switching tube Q2, a sixth switching tube Q3, and a seventh
  • the inverter bridge composed of the switch tube Q4 and the filter inductor L3, the gate of the fourth switch tube Q1, the gate of the fifth switch tube Q2, the gate of the sixth switch tube Q3, and the gate of the seventh switch tube Q4 Used to access the PWM control signal, and control the fourth switching transistor Q1, the fifth switching transistor Q2, the sixth switching transistor Q3, and the seventh switching transistor Q4 to be turned on or off, so that the inverter inverting unit 70 outputs AC power, an output end of the inverter bridge is connected to a front end of the filter inductor L3, a rear end of the filter inductor L3 is connected to a load, and the filter inductor L3 is used for filtering a high frequency pulse in the alternating current and is a load Provides
  • the input rectifying unit 10 rectifies the grid voltage, and then filters the filter unit 20 to output a pulsating DC voltage, and then uses the PFC boosting unit 30 to boost the pulsating DC voltage.
  • the LLC isolated converter unit 40 the first switching transistor Q6, the second switching transistor Q7, the resonant capacitor C4, the discharging resistor R2B, and the leakage inductance of the primary side of the transformer T1 and the primary exciting inductance constitute an LLC resonant circuit, and are in the LLC resonant circuit.
  • the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.
  • the invention provides a filter inductor L3 at the output end of the inverter inverting unit 70, and the filter inductor L3 can filter out the high frequency pulse in the alternating current, so that the load can obtain high quality power frequency sinusoidal alternating current, thereby improving Output voltage quality to meet power supply requirements.
  • the input rectifying unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1, and the fuse F2 is connected to the neutral line of the socket.
  • the front end of the common mode suppression inductor L1 is connected in parallel to the socket
  • the lightning protection resistor RV1 is connected in parallel to the front end of the common mode suppression inductor L1
  • the input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are connected in parallel
  • the mode suppresses the rear end of the inductor L1, and the output of the rectifier bridge DB1 is used to output a pulsating DC voltage.
  • the filtering unit 20 includes a filtering capacitor C1 connected between the output end of the input rectifying unit 10 and the front end ground.
  • the PFC boosting unit 30 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 filtering unit 20
  • the output end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 30, and the first rectification is performed.
  • the cathode of the diode D1 is connected to the anode of the second electrolytic capacitor C2, and the cathode of the second electrolytic capacitor C2 is connected to the front end. Further, a third pull-down resistor R22 is connected between the gate of the third switching transistor Q5 and the front end ground.
  • the PFC boosting unit 30 when the C1 output half-wave AC voltage is detected, the PFC enters the boost mode to improve the PF value of the AC-to-AC intelligent buck conversion topology circuit, and the voltage after the boosting is C2 filtered. 400V.
  • the specific boosting principle is as follows: When Q5 is turned on, the current on C1 forms a loop through the boost inductors L2 and Q5 to GND, and the boost inductor L2 stores energy; when Q5 is turned off, the boost inductor forms a specific input voltage.
  • the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the C2 capacitor for filtering, and filtered into a DC voltage of 400V.
  • Q5 is based on the input AC sine wave change taken by the MCU control unit 80 to increase or decrease the on-time of Q5, so that the current and voltage phases are consistent to increase the PF value.
  • the embodiment further includes an MCU control unit 80.
  • the gate of the first switch tube Q6, the gate of the second switch tube Q7 and the gate of the third switch tube Q5 are respectively connected to the MCU control unit. 80.
  • the MCU control unit 80 is configured to output PWM signals to the first switch tube Q6, the second switch tube Q7, and the third switch tube Q5, respectively, to control the first switch tube Q6, the second switch tube Q7, and the third switch.
  • the tube Q5 is in an on-off state
  • the MCU control unit 80 is further configured to output four PWM pulse signals to the inverter inverting unit 70 to cause the inverter inverting unit 70 to output an alternating current.
  • the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
  • an AC sampling unit 90 is further included.
  • the AC sampling unit 90 is connected between the input end of the input rectifying unit 10 and the MCU control unit 80.
  • the AC sampling unit 90 is used.
  • the voltage on the AC side of the input rectification unit 10 is collected and fed back to the MCU control unit 80.
  • the AC sampling unit 90 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 unit 10 through a current limiting resistor, The output of the operational amplifier U9B is 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 60, and the DC voltage sampling unit 60 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series.
  • the front end of the second sampling resistor R13 is connected to the output end of the LLC isolation converter unit 40, 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 The three-sampling resistor R15 causes the MCU control unit 80 to acquire an electrical signal at the output of the LLC isolated converter unit 40.
  • a first pull-down resistor R25 is connected between the gate and the source of the first switching transistor Q6, and the second switching transistor Q7 is connected.
  • a second pull-down resistor R26 is connected between the gate and the source.
  • the inverter inverting unit 70 in this embodiment is composed of Q1, Q2, Q3, Q4, and L3, and the DC voltage filtered by C3 is looped through Q1, L4, load, and Q4 to supply power to the load to form the first high frequency pulse.
  • Level; the second high-frequency pulse level forms a loop through Q2, L3, load, Q3, and filters the blocking effect of high-frequency pulse level through L3, forming a complete power-frequency sine wave communication on the load.
  • the PWM signal outputted by the control chip U1 is sent to the GATE poles of Q1, Q2, Q3, and Q4 by the PWM1H, PWM1L, PWM2H, and PWM2L through the driving circuit.
  • the phase and frequency in the inverter inverter circuit operate according to the mode set in the control chip, and Q1, Q2, Q3, and Q4 operate through the power frequency modulation high frequency PWM mode, and the inductor L3 filters the high frequency pulse level. In addition, leaving the power frequency sinusoidal AC power to the load.
  • the invention discloses an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is compared with the prior art.
  • the invention has a high PF value, realizes isolation between the power grid and the output end, and has high security.
  • the output voltage can be automatically adjusted within the input full voltage range, and the output frequency is fixed.
  • the output voltage is sinusoidal output, and the AC voltage has an automatic shaping function.
  • the present invention includes a voltage and current sampling circuit. It can prevent surge voltage and current.

Abstract

A PFC and LLC resonance-based intelligent full-bridge sine-wave voltage conversion circuit, comprising: an input rectification unit (10), a filtering unit (20), a PFC voltage boosting unit (30), and an LLC isolation converter unit (40), a DC voltage filtering unit (50), and an inverter unit (70). The LLC isolation converter unit comprises a first switching transistor (Q6), a second switching transistor (Q7), a first freewheeling diode (D6), a second freewheeling diode (D5), a transformer (T1), a resonant capacitor (C4), and a discharge resistor (R2B). The inverter unit comprises an inverter bridge consisting of a fourth switching transistor (Q1), a fifth switching transistor (Q2), a sixth switching transistor (Q3), and a seventh switching transistor (Q4) and a filtering inductor (L3), the output end of the inverter bridge being connected to the front end of the filtering inductor, the back end of the filtering inductor being connected to a load, and the filtering inductor being used for filtering out a high-frequency pulse in alternating current and supplying power frequency sine-wave alternating current to the load. The voltage conversion circuit can improve a power factor value and can also filter out a high-frequency pulse at an output side, so as to provide high-quality power frequency sine-wave alternating current for a load.

Description

基于PFC与LLC谐振的智能全桥正弦波电压转换电路Intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance
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与LLC谐振的智能全桥正弦波电压转换电路。The invention relates to a voltage conversion circuit, in particular to an intelligent full bridge sine wave voltage conversion circuit based on PFC and LLC resonance.
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，正弦波电压转换电路拓扑是其关键电路，是一种能实现AC-AC变换的电路，可以在AC-AC变换中实现升降压并稳定电压与频率的功能。然而目前的AC-AC便隽式设备市场大多数为非隔离型的拓扑电路，且PF值低、输出电压质量低、安全可靠性差。实际应用中，由于电压转换过程中存在开关管的高速切换，使得电路的输出侧会存在一定的高频脉冲信号，进而影响输出电压的质量，因而难以满足转换要求。In the prior art, the intelligent buck-boost conversion device from AC to AC is also called a travel strip. In this device, the sine wave voltage conversion circuit topology is its key circuit, 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. In practical applications, due to the high-speed switching of the switching tube during the voltage conversion process, a certain high-frequency pulse signal exists on the output side of the circuit, thereby affecting the quality of the output voltage, and thus it is difficult to meet the conversion requirement.
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，提供一种基于PFC与LLC谐振的智能全桥正弦波电压转换电路，用以提高电压转换装置的PF值、提高输出电压质量，并且能够滤除输出侧的高频脉冲，进而为负载提供优质工频正弦交流电。The technical problem to be solved by the present invention is to provide an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance for improving the PF value of the voltage conversion device and improving the output voltage quality, and aiming at the deficiencies of the prior art. It can filter high frequency pulses on the output side to provide high quality power frequency sinusoidal AC power for the load.
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与LLC谐振的智能全桥正弦波电压转换电路，其包括有用于对电网电压进行整流的输入整流单元、用于对输入整流单元输出的电压进行滤波的滤波单元、用于对滤波单元输出的电压进行升压转换的PFC升压单元，以及：一LLC隔离变换器单元，包括有第一开关管、第二开关管、第一续流二极管、第二续流二极管、变压器、谐振电容和放电电阻，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的第一端，所述变压器的第二端通过谐振电容连接前端地，所述第二开关管的漏极连接于第一开关管的源极，所述第二开关管的源极通过放电电阻连接前端地，所述第一开关管的栅极和第二开关管的栅极用于加载两路相位相反的PWM脉冲信号，以令所述第一开关管和第二开关管交替导通，所述变压器副边绕组的第一端连接于第一续流二极管的阳极，所述变压器副边绕组的第二端连接于第二续流二极管的阳极，所述第一续流二极管的阴极和第二续流二极管的阴极均连接后端地，所述变压器副边绕组的中间抽头作为LLC隔离变换器 单元的输出端；一DC电压滤波单元，包括有第一电解电容，所述第一电解电容的正极连接于LLC隔离变换器单元的输出端，所述第一电解电容的负极连接后端地；一逆变倒相单元，连接于LLC隔离变换器单元的输出端，所述逆变倒相单元包括由第四开关管、第五开关管、第六开关管和第七开关管组成的逆变桥以及滤波电感，所述第四开关管的栅极、第五开关管的栅极、第六开关管的栅极和第七开关管的栅极分别用于接入PWM控制信号，通过控制第四开关管、第五开关管、第六开关管和第七开关管导通或截止，以令所述逆变倒相单元输出交流电，所述逆变桥的输出端连接于滤波电感的前端，所述滤波电感的后端连接负载，所述滤波电感用于滤除所述交流电中的高频脉冲，并为负载提供工频正弦交流电。An intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, comprising an input rectifying unit for rectifying a grid voltage, a filtering unit for filtering a voltage outputted by an input rectifying unit, and a filtering unit a PFC boosting unit for boosting the voltage outputted by the unit, and: an LLC isolated converter unit including a first switching transistor, a second switching transistor, a first freewheeling diode, a second freewheeling diode, a transformer, and a resonance a capacitor and a discharge resistor, a drain of the first switch tube is connected to an output end of the PFC boost unit, a source of the first switch tube is connected to a first end of the transformer, and a second end of the transformer is resonant a capacitor is connected to the front end, a drain of the second switch tube is connected to a source of the first switch tube, a source of the second switch tube is connected to a front end through a discharge resistor, and a gate of the first switch tube The gate of the second switch tube is configured to load two PWM pulse signals of opposite phases to alternately conduct the first switch tube and the second switch tube, and the first end of the transformer secondary winding The anode of the first freewheeling diode is connected to the anode of the second freewheeling diode, and the cathode of the first freewheeling diode and the cathode of the second freewheeling diode are connected to the back end. Ground, the center tap of the secondary winding of the transformer acts as an LLC isolating converter An output terminal of the unit; a DC voltage filtering unit comprising a first electrolytic capacitor, an anode of the first electrolytic capacitor is connected to an output end of the LLC isolating converter unit, and a cathode of the first electrolytic capacitor is connected to a rear end; An inverter inverter unit is connected to an output end of the LLC isolation converter unit, and the inverter inverter unit includes an inverter composed of a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube a bridge and a filter inductor, the gate of the fourth switch, the gate of the fifth switch, the gate of the sixth switch, and the gate of the seventh switch are respectively used to access the PWM control signal, and the control The fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned on or off, so that the inverter inverting unit outputs alternating current, and the output end of the inverter bridge is connected to the front end of the filter inductor. The back end of the filter inductor is connected to a load, and the filter inductor is used to filter high frequency pulses in the alternating current and provide power frequency sinusoidal alternating current for the load.
优选地，所述输入整流单元包括有插座、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用于输出脉动直流电压。Preferably, the input rectifying unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppression inductor The front end is connected in parallel to the socket, and the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor. The input terminals 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 is used. The output is pulsating DC voltage.
优选地，所述滤波单元包括有滤波电容，所述滤波电容连接于输入整流单元的输出端与前端地之间。Preferably, the filtering unit comprises a filtering capacitor connected between the output end of the input rectifying unit and the front end ground.
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 rectifier diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the filtering unit, the boosting inductor The back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube The drain is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.
优选地，所述第三开关管的栅极与前端地之间连接有第三下拉电阻。Preferably, a third pull-down resistor is connected between the gate of the third switch tube and the front end ground.
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，所述MCU控制单元还用于向逆变倒相单元输出四路PWM脉冲信号，以令所述逆变倒相单元输出交流电。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 And outputting a PWM signal to the first switch tube, the second switch tube and the third switch tube to control an on/off state of the first switch tube, the second switch tube and the third switch tube, wherein the MCU control unit is further used for inverting The inverter unit outputs four PWM pulse signals to cause the inverter inverting unit to output an alternating current.
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 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 unit and feed back 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 tube, and the third switch The source of the tube is connected to the MCU control unit, and the MCU control unit acquires an electrical signal of the source of the third switching tube by the first sampling resistor.
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LLC隔离变换器单元的输出端，所述第三采样电阻的后端连接于MCU控制单元，藉由所述第二采样电阻和第三采样电阻而令MCU控制单元采集LLC隔离变换器单元输出端的电信号。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 an output of the LLC isolation converter unit. The back end of the third sampling resistor is connected to the MCU control unit, and the MCU control unit acquires an electrical signal of the output of the LLC isolated converter unit by the second sampling resistor and the third sampling resistor.
优选地，所述第一开关管的栅极与源极之间连接有第一下拉电阻，所述第二开关管的栅极与源极之间连接有第二下拉电阻。Preferably, a first pull-down resistor is connected between the gate and the source of the first switch, and a second pull-down resistor is connected between the gate and the source of the second switch.
本发明公开的基于PFC与LLC谐振的智能全桥正弦波电压转换电路中，输入整流单元对电网电压进行整流后，再经过滤波单元滤波而输出脉动直流电压，之后利用PFC升压单元对脉动直流电压进行升压处理，在LLC隔离变换器单元中，第一开关管、第二开关管、谐振电容、放电电阻与变压器原边的漏感及原边励磁电感组成LLC谐振电路，并在LLC谐振电路的状态转换过程中将电能传输至变压器的副边线圈，通过第一续流二极管和第二续流二极管整流成单向脉动电平，通过改变变压器原副边绕组的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元的输出端设置了滤波电感，利用滤波电感可滤除交流电中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。In the intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance disclosed in the present invention, the input rectifying unit rectifies the grid voltage, and then filters the pulsating DC voltage through the filtering unit, and then uses the PFC boosting unit to pulsate DC The voltage is boosted. In the LLC isolating converter unit, the first switching transistor, the second switching transistor, the resonant capacitor, the discharge resistance and the leakage inductance of the primary side of the transformer and the primary exciting inductance constitute an LLC resonant circuit, and are resonant at LLC. During the state transition of the circuit, the power is transmitted to the secondary winding of the transformer, and is rectified into a unidirectional ripple level by the first freewheeling diode and the second freewheeling diode, and can be adjusted by changing the turns ratio of the primary winding of the transformer. The output voltage is high or low, which in turn enables step-up or step-down conversion. Based on the above structure, the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable. On the basis of this, the invention provides a filter inductor at the output end of the inverter inverter unit, and the filter inductor can filter the high frequency pulse in the alternating current, so that the load can obtain high quality power frequency sinusoidal alternating current, thereby improving the output voltage quality. To meet the power supply needs.
附图说明DRAWINGS
图1为本发明全桥正弦波电压转换电路的原理图。1 is a schematic diagram of a full bridge sinusoidal voltage conversion circuit of the present invention.
图2为本发明优选实施例中交流采样单元的电路原理图。2 is a circuit schematic diagram of an AC sampling unit in a preferred embodiment of the present invention.
图3为本发明优选实施例中MCU控制单元的电路原理图。3 is a circuit schematic diagram of an MCU control unit in a preferred embodiment of the present invention.
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与LLC谐振的智能全桥正弦波电压转换电路，结合图1至图3所示，其包括有用于对电网电压进行整流的输入整流单元10、用于对输入整流单元10输出的电压进行滤波的滤波单元20、用于对滤波单元20输出的电压进行升压转换的PFC升压单元30，以及： The invention discloses an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3, and includes an input rectifying unit 10 for rectifying a grid voltage for rectifying an input. The filtering unit 20 that filters the voltage output by the unit 10, the PFC boosting unit 30 that performs boost conversion on the voltage output by the filtering unit 20, and:
一LLC隔离变换器单元40，包括有第一开关管Q6、第二开关管Q7、第一续流二极管D6、第二续流二极管D5、变压器T1、谐振电容C4和放电电阻R2B，所述第一开关管Q6的漏极连接于PFC升压单元30的输出端，所述第一开关管Q6的源极连接于变压器T1的第一端，所述变压器T1的第二端通过谐振电容C4连接前端地，所述第二开关管Q7的漏极连接于第一开关管Q6的源极，所述第二开关管Q7的源极通过放电电阻R2B连接前端地，所述第一开关管Q6的栅极和第二开关管Q7的栅极用于加载两路相位相反的PWM脉冲信号，以令所述第一开关管Q6和第二开关管Q7交替导通，所述变压器T1副边绕组的第一端连接于第一续流二极管D6的阳极，所述变压器T1副边绕组的第二端连接于第二续流二极管D5的阳极，所述第一续流二极管D6的阴极和第二续流二极管D5的阴极均连接后端地，所述变压器T1副边绕组的中间抽头作为LLC隔离变换器单元40的输出端；An LLC isolation converter unit 40 includes a first switching transistor Q6, a second switching transistor Q7, a first freewheeling diode D6, a second freewheeling diode D5, a transformer T1, a resonant capacitor C4, and a discharging resistor R2B. The drain of a switch Q6 is connected to the output of the PFC boost unit 30. The source of the first switch Q6 is connected to the first end of the transformer T1, and the second end of the transformer T1 is connected through the resonant capacitor C4. The front end of the second switch tube Q7 has a drain connected to the source of the first switch tube Q6, and the source of the second switch tube Q7 is connected to the front end through a discharge resistor R2B, the first switch tube Q6 The gates of the gates and the second switching transistors Q7 are used to load two PWM pulse signals of opposite phases to alternately conduct the first switching transistor Q6 and the second switching transistor Q7, and the secondary winding of the transformer T1 The first end is connected to the anode of the first freewheeling diode D6, the second end of the secondary winding of the transformer T1 is connected to the anode of the second freewheeling diode D5, the cathode of the first freewheeling diode D6 and the second continuation The cathode of the flow diode D5 is connected to the rear end ground, and the secondary winding of the transformer T1 Intermediate tap output of the isolation transformer as the LLC unit 40;
一DC电压滤波单元50，包括有第一电解电容C3，所述第一电解电容C3的正极连接于LLC隔离变换器单元40的输出端，所述第一电解电容C3的负极连接后端地；a DC voltage filtering unit 50 includes a first electrolytic capacitor C3, an anode of the first electrolytic capacitor C3 is connected to an output end of the LLC isolation converter unit 40, and a cathode of the first electrolytic capacitor C3 is connected to a rear end;
一逆变倒相单元70，连接于LLC隔离变换器单元40的输出端，所述逆变倒相单元70包括由第四开关管Q1、第五开关管Q2、第六开关管Q3和第七开关管Q4组成的逆变桥以及滤波电感L3，所述第四开关管Q1的栅极、第五开关管Q2的栅极、第六开关管Q3的栅极和第七开关管Q4的栅极分别用于接入PWM控制信号，通过控制第四开关管Q1、第五开关管Q2、第六开关管Q3和第七开关管Q4导通或截止，以令所述逆变倒相单元70输出交流电，所述逆变桥的输出端连接于滤波电感L3的前端，所述滤波电感L3的后端连接负载，所述滤波电感L3用于滤除所述交流电中的高频脉冲，并为负载提供工频正弦交流电。An inverter inverting unit 70 is connected to an output end of the LLC isolating converter unit 40. The inverter inverting unit 70 includes a fourth switching tube Q1, a fifth switching tube Q2, a sixth switching tube Q3, and a seventh The inverter bridge composed of the switch tube Q4 and the filter inductor L3, the gate of the fourth switch tube Q1, the gate of the fifth switch tube Q2, the gate of the sixth switch tube Q3, and the gate of the seventh switch tube Q4 Used to access the PWM control signal, and control the fourth switching transistor Q1, the fifth switching transistor Q2, the sixth switching transistor Q3, and the seventh switching transistor Q4 to be turned on or off, so that the inverter inverting unit 70 outputs AC power, an output end of the inverter bridge is connected to a front end of the filter inductor L3, a rear end of the filter inductor L3 is connected to a load, and the filter inductor L3 is used for filtering a high frequency pulse in the alternating current and is a load Provides power frequency sinusoidal AC.
上述全桥正弦波电压转换电路中，输入整流单元10对电网电压进行整流后，再经过滤波单元20滤波而输出脉动直流电压，之后利用PFC升压单元30对脉动直流电压进行升压处理，在LLC隔离变换器单元40中，第一开关管Q6、第二开关管Q7、谐振电容C4、放电电阻R2B与变压器T1原边的漏感及原边励磁电感组成LLC谐振电路，并在LLC谐振电路的状态转换过程中将电能传输至变压器T1的副边线圈，通过第一续流二极管D6和第二续流二极管D5整流成单向脉动电平，通过改变变压器T1原副边绕组的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元70的输出端设置了滤波电感L3，利用滤波电感L3可滤除交流电中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。 In the full-bridge sinusoidal voltage conversion circuit, the input rectifying unit 10 rectifies the grid voltage, and then filters the filter unit 20 to output a pulsating DC voltage, and then uses the PFC boosting unit 30 to boost the pulsating DC voltage. In the LLC isolated converter unit 40, the first switching transistor Q6, the second switching transistor Q7, the resonant capacitor C4, the discharging resistor R2B, and the leakage inductance of the primary side of the transformer T1 and the primary exciting inductance constitute an LLC resonant circuit, and are in the LLC resonant circuit. During the state transition process, power is transferred to the secondary winding of the transformer T1, and is rectified into a unidirectional ripple level by the first freewheeling diode D6 and the second freewheeling diode D5, by changing the turns ratio of the primary and secondary windings of the transformer T1. The output voltage can be adjusted to achieve boost or buck conversion. Based on the above structure, the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable. On the basis of the above, the invention provides a filter inductor L3 at the output end of the inverter inverting unit 70, and the filter inductor L3 can filter out the high frequency pulse in the alternating current, so that the load can obtain high quality power frequency sinusoidal alternating current, thereby improving Output voltage quality to meet power supply requirements.
关于输入部分的处理，所述输入整流单元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的输出端用于输出脉动直流电压。Regarding the processing of the input portion, the input rectifying unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1, and the fuse F2 is connected to the neutral line of the socket. Or the live line, the front end of the common mode suppression inductor L1 is connected in parallel to the socket, the lightning protection resistor RV1 is connected in parallel to the front end of the common mode suppression inductor L1, and the input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are connected in parallel The mode suppresses the rear end of the inductor L1, and the output of the rectifier bridge DB1 is used to output a pulsating DC voltage.
在滤波部分，所述滤波单元20包括有滤波电容C1，所述滤波电容C1连接于输入整流单元10的输出端与前端地之间。In the filtering part, the filtering unit 20 includes a filtering capacitor C1 connected between the output end of the input rectifying unit 10 and the front end ground.
本实施例中，所述PFC升压单元30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的前端连接于滤波单元20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30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。进一步地，所述第三开关管Q5的栅极与前端地之间连接有第三下拉电阻R22。In this embodiment, the PFC boosting unit 30 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 filtering unit 20 The output end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 30, and the first rectification is performed. The cathode of the diode D1 is connected to the anode of the second electrolytic capacitor C2, and the cathode of the second electrolytic capacitor C2 is connected to the front end. Further, a third pull-down resistor R22 is connected between the gate of the third switching transistor Q5 and the front end ground.
上述PFC升压单元30中，当监测到C1输出半波交流电压时，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C2滤波后的电压为400V。具体的升压原理如下：Q5导通时，C1上的电流经升压电感L2、Q5到GND形成回路，升压电感L2储存能量；当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C2电容进滤波，滤波成400V的直流电压。其中Q5是根据MCU控制单元80采到的输入交流正弦波变化来加大或减少Q5的导通时间，使得电流与电压相位达到一致来提高PF值。In the PFC boosting unit 30, when the C1 output half-wave AC voltage is detected, the PFC enters the boost mode to improve the PF value of the AC-to-AC intelligent buck conversion topology circuit, and the voltage after the boosting is C2 filtered. 400V. The specific boosting principle is as follows: When Q5 is turned on, the current on C1 forms a loop through the boost inductors L2 and Q5 to GND, and the boost inductor L2 stores energy; when Q5 is turned off, the boost inductor forms a specific input voltage. The much higher induced electromotive force, the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the C2 capacitor for filtering, and filtered into a DC voltage of 400V. Q5 is based on the input AC sine wave change taken by the MCU control unit 80 to increase or decrease the on-time of Q5, so that the current and voltage phases are consistent to increase the PF value.
关于主控部分，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，所述MCU控制单元80还用于向逆变倒相单元70输出四路PWM脉冲信号，以令所述逆变倒相单元70输出交流电。进一步地，所述MCU控制单元80包括有单片机U1及其外围电路。For the main control part, the embodiment further includes an MCU control unit 80. The gate of the first switch tube Q6, the gate of the second switch tube Q7 and the gate of the third switch tube Q5 are respectively connected to the MCU control unit. 80. The MCU control unit 80 is configured to output PWM signals to the first switch tube Q6, the second switch tube Q7, and the third switch tube Q5, respectively, to control the first switch tube Q6, the second switch tube Q7, and the third switch. The tube Q5 is in an on-off state, and the MCU control unit 80 is further configured to output four PWM pulse signals to the inverter inverting unit 70 to cause the inverter inverting unit 70 to output an alternating current. Further, the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
了便于监测交流侧的电信号，本实施例还包括有一交流采样单元90，所述交流采样单元90连接于输入整流单元10的输入端与MCU控制单元80之间，所述交流采样单元90用于采集输入整流单元10交流侧的电压并反馈至MCU控制单元80。 In this embodiment, an AC sampling unit 90 is further included. The AC sampling unit 90 is connected between the input end of the input rectifying unit 10 and the MCU control unit 80. The AC sampling unit 90 is used. The voltage on the AC side of the input rectification unit 10 is collected and fed back to the MCU control unit 80.
关于该交流采样单元90的具体组成，所述交流采样单元90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。Regarding the specific composition of the AC sampling unit 90, the AC sampling unit 90 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 unit 10 through a current limiting resistor, The output of the operational amplifier U9B is 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60，所述DC电压采样单元60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LLC隔离变换器单元40的输出端，所述第三采样电阻R15的后端连接于MCU控制单元80，藉由所述第二采样电阻R13和第三采样电阻R15而令MCU控制单元80采集LLC隔离变换器单元40输出端的电信号。As a preferred manner, in order to collect the DC side electrical signal, the embodiment further includes a DC voltage sampling unit 60, and the DC voltage sampling unit 60 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series. The front end of the second sampling resistor R13 is connected to the output end of the LLC isolation converter unit 40, 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 The three-sampling resistor R15 causes the MCU control unit 80 to acquire an electrical signal at the output of the LLC isolated converter unit 40.
为了提高第一开关管Q6和第一下拉电阻R25的开关速度，所述第一开关管Q6的栅极与源极之间连接有第一下拉电阻R25，所述第二开关管Q7的栅极与源极之间连接有第二下拉电阻R26。In order to increase the switching speed of the first switching transistor Q6 and the first pull-down resistor R25, a first pull-down resistor R25 is connected between the gate and the source of the first switching transistor Q6, and the second switching transistor Q7 is connected. A second pull-down resistor R26 is connected between the gate and the source.
本实施例中的逆变倒相单元70由Q1、Q2、Q3、Q4、L3组成，经过C3滤波后的直流电压经Q1、L4、负载、Q4形成回路给负载供电形成第一个高频脉电平；第二个高频脉冲电平通过Q2、L3、负载、Q3形成回路，通过L3对高频脉冲电平的阻碍作用进行滤波，在负载上就形成了一个完整的工频正弦波交流电压。控制芯片U1输出的PWM信号经驱动电路后分别送出PWM1H、PWM1L、PWM2H、PWM2L给Q1、Q2、Q3、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，且Q1、Q2、Q3、Q4是通过工频调制高频PWM模式进行工作，电感L3将高频脉冲电平滤除，留下工频正弦交流电对负载供电。The inverter inverting unit 70 in this embodiment is composed of Q1, Q2, Q3, Q4, and L3, and the DC voltage filtered by C3 is looped through Q1, L4, load, and Q4 to supply power to the load to form the first high frequency pulse. Level; the second high-frequency pulse level forms a loop through Q2, L3, load, Q3, and filters the blocking effect of high-frequency pulse level through L3, forming a complete power-frequency sine wave communication on the load. Voltage. The PWM signal outputted by the control chip U1 is sent to the GATE poles of Q1, Q2, Q3, and Q4 by the PWM1H, PWM1L, PWM2H, and PWM2L through the driving circuit. The phase and frequency in the inverter inverter circuit operate according to the mode set in the control chip, and Q1, Q2, Q3, and Q4 operate through the power frequency modulation high frequency PWM mode, and the inductor L3 filters the high frequency pulse level. In addition, leaving the power frequency sinusoidal AC power to the load.
本发明公开的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其相比现有技术而言，首先，本发明具有高PF值，实现了电网与输出端隔离，安全性非常高，同时，在输入全电压范围内能够能自动调节输出电压，并且固定输出频率，再次，输出电压是以正弦波输出，对交流电压有自动整形功能，此外，本发明方案含有电压与电流采样电路，能防浪涌电压与电流。The invention discloses an intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is compared with the prior art. Firstly, the invention has a high PF value, realizes isolation between the power grid and the output end, and has high security. At the same time, the output voltage can be automatically adjusted within the input full voltage range, and the output frequency is fixed. Again, the output voltage is sinusoidal output, and the AC voltage has an automatic shaping function. In addition, the present invention includes a voltage and current sampling circuit. It can 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与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，包括有用于对电网电压进行整流的输入整流单元、用于对输入整流单元输出的电压进行滤波的滤波单元、用于对滤波单元输出的电压进行升压转换的PFC升压单元，以及：An intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, characterized in that it comprises an input rectifying unit for rectifying a grid voltage, a filtering unit for filtering a voltage outputted by an input rectifying unit, and a PFC boosting unit that performs boost conversion on the voltage output from the filtering unit, and:
    一LLC隔离变换器单元，包括有第一开关管、第二开关管、第一续流二极管、第二续流二极管、变压器、谐振电容和放电电阻，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的第一端，所述变压器的第二端通过谐振电容连接前端地，所述第二开关管的漏极连接于第一开关管的源极，所述第二开关管的源极通过放电电阻连接前端地，所述第一开关管的栅极和第二开关管的栅极用于加载两路相位相反的PWM脉冲信号，以令所述第一开关管和第二开关管交替导通，所述变压器副边绕组的第一端连接于第一续流二极管的阳极，所述变压器副边绕组的第二端连接于第二续流二极管的阳极，所述第一续流二极管的阴极和第二续流二极管的阴极均连接后端地，所述变压器副边绕组的中间抽头作为LLC隔离变换器单元的输出端；An LLC isolated converter unit includes a first switching transistor, a second switching transistor, a first freewheeling diode, a second freewheeling diode, a transformer, a resonant capacitor and a discharge resistor, and a drain of the first switching transistor is connected to An output end of the PFC boosting unit, a source of the first switching tube is connected to a first end of the transformer, a second end of the transformer is connected to the front end through a resonant capacitor, and a drain of the second switching tube is connected to a source of the first switching transistor, a source of the second switching transistor is connected to the front end through a discharge resistor, and a gate of the first switching transistor and a gate of the second switching transistor are used to load two PWMs with opposite phases And a pulse signal, wherein the first switch tube and the second switch tube are alternately turned on, the first end of the transformer secondary winding is connected to the anode of the first freewheeling diode, and the second end of the transformer secondary winding Connected to the anode of the second freewheeling diode, the cathode of the first freewheeling diode and the cathode of the second freewheeling diode are connected to the rear end, and the center tap of the secondary winding of the transformer serves as the output of the LLC isolated converter unit end;
    一DC电压滤波单元，包括有第一电解电容，所述第一电解电容的正极连接于LLC隔离变换器单元的输出端，所述第一电解电容的负极连接后端地；a DC voltage filtering unit includes a first electrolytic capacitor, an anode of the first electrolytic capacitor is connected to an output end of the LLC isolation converter unit, and a cathode of the first electrolytic capacitor is connected to a rear end;
    一逆变倒相单元，连接于LLC隔离变换器单元的输出端，所述逆变倒相单元包括由第四开关管、第五开关管、第六开关管和第七开关管组成的逆变桥以及滤波电感，所述第四开关管的栅极、第五开关管的栅极、第六开关管的栅极和第七开关管的栅极分别用于接入PWM控制信号，通过控制第四开关管、第五开关管、第六开关管和第七开关管导通或截止，以令所述逆变倒相单元输出交流电，所述逆变桥的输出端连接于滤波电感的前端，所述滤波电感的后端连接负载，所述滤波电感用于滤除所述交流电中的高频脉冲，并为负载提供工频正弦交流电。An inverter inverter unit is connected to an output end of the LLC isolation converter unit, and the inverter inverter unit includes an inverter composed of a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube a bridge and a filter inductor, the gate of the fourth switch, the gate of the fifth switch, the gate of the sixth switch, and the gate of the seventh switch are respectively used to access the PWM control signal, and the control The fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned on or off, so that the inverter inverting unit outputs alternating current, and the output end of the inverter bridge is connected to the front end of the filter inductor. The back end of the filter inductor is connected to a load, and the filter inductor is used to filter high frequency pulses in the alternating current and provide power frequency sinusoidal alternating current for the load.
  2. 如权利要求1所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，所述输入整流单元包括有插座、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用于输出脉动直流电压。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein the input rectifying unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor, and a rectifier bridge, the fuse is connected to the neutral or the live line of the socket, the front end of the common mode suppression inductor is connected in parallel to the socket, and the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, the safety capacitor and the rectification The input ends of the bridges are all connected in parallel to the rear end of the common mode rejection inductor, and the output of the rectifier bridge is used to output a pulsating DC voltage.
  3. 如权利要求1所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，所述滤波单元包括有滤波电容，所述滤波电容连接于输入整流单元的输出端与前端地之间。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein the filtering unit comprises a filter capacitor, and the filter capacitor is connected to the output end and the front end of the input rectifying unit. between.
  4. 如权利要求1所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在 于，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。The intelligent full bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, characterized in that The PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifier diode, and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the filtering unit, and the boosting inductor is The back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube The drain is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor is connected Front end.
  5. 如权利要求4所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，所述第三开关管的栅极与前端地之间连接有第三下拉电阻。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 4, wherein a third pull-down resistor is connected between the gate of the third switching transistor and the front end ground.
  6. 如权利要求4所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，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，所述MCU控制单元还用于向逆变倒相单元输出四路PWM脉冲信号，以令所述逆变倒相单元输出交流电。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 4, further comprising an MCU control unit, a gate of the first switch tube, and a gate of the second switch tube And the gates of the third switch tube are respectively connected to the MCU control unit, wherein the MCU control unit is configured to respectively output PWM signals to the first switch tube, the second switch tube and the third switch tube to control the first switch tube, The two switching tubes and the third switching tube are in an on-off state, and the MCU control unit is further configured to output four PWM pulse signals to the inverter inverting unit, so that the inverter inverting unit outputs an alternating current.
  7. 如权利要求6所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，还包括有一交流采样单元，所述交流采样单元连接于输入整流单元的输入端与MCU控制单元之间，所述交流采样单元用于采集输入整流单元交流侧的电压并反馈至MCU控制单元。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 6, further comprising an AC sampling unit connected to the input end of the input rectifying unit and the MCU control unit The AC sampling unit is configured to collect the voltage of the AC side of the input rectifying unit and feed back to the MCU control unit.
  8. 如权利要求6所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，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。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 6, wherein a first sampling resistor is connected between a source and a front end of the third switching transistor, The source of the three-switching transistor is connected to the MCU control unit, and the MCU control unit collects the electrical signal of the source of the third switching transistor by the first sampling resistor.
  9. 如权利要求6所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，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LLC隔离变换器单元的输出端，所述第三采样电阻的后端连接于MCU控制单元，藉由所述第二采样电阻和第三采样电阻而令MCU控制单元采集LLC隔离变换器单元输出端的电信号。The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 6, further comprising a DC voltage sampling unit, wherein the DC voltage sampling unit comprises a second sampling resistor connected in series and a third sampling resistor, a front end of the second sampling resistor is connected to an output end of the LLC isolation converter unit, a rear end of the third sampling resistor is connected to the MCU control unit, and the second sampling resistor and the third The sampling resistor causes the MCU control unit to acquire an electrical signal at the output of the LLC isolated converter unit.
  10. 如权利要求1所述的基于PFC与LLC谐振的智能全桥正弦波电压转换电路，其特征在于，所述第一开关管的栅极与源极之间连接有第一下拉电阻，所述第二开关管的栅极与源极之间连接有第二下拉电阻。 The intelligent full-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein a first pull-down resistor is connected between a gate and a source of the first switching transistor, A second pull-down resistor is connected between the gate and the source of the second switching transistor.
PCT/CN2017/079185 2016-12-15 2017-04-01 Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit WO2018107619A1 (en)

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