WO2018126557A1 - Pfc and llc resonance-based smart half bridge sine wave voltage conversion circuit - Google Patents

Pfc and llc resonance-based smart half bridge sine wave voltage conversion circuit Download PDF

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Publication number
WO2018126557A1
WO2018126557A1 PCT/CN2017/080985 CN2017080985W WO2018126557A1 WO 2018126557 A1 WO2018126557 A1 WO 2018126557A1 CN 2017080985 W CN2017080985 W CN 2017080985W WO 2018126557 A1 WO2018126557 A1 WO 2018126557A1
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Prior art keywords
unit
switching transistor
pfc
electrolytic capacitor
output
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PCT/CN2017/080985
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French (fr)
Chinese (zh)
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廖志刚
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广东百事泰电子商务股份有限公司
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Publication of WO2018126557A1 publication Critical patent/WO2018126557A1/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
    • 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
    • H02M1/32—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
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to a voltage conversion circuit, in particular to an intelligent half 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 plug.
  • the voltage conversion circuit is a key circuit thereof, and is a circuit capable of realizing AC-AC conversion, which can be AC-AC conversion realizes the function of buck-boost and stabilizes voltage and frequency.
  • most of the current AC-AC portable device market is a non-isolated topology circuit with low PF value, low output voltage quality, and poor safety and reliability.
  • a certain high-frequency pulse signal exists on the output side of the circuit, thereby affecting the quality of the output voltage, and thus it is difficult to meet the conversion requirement.
  • the technical problem to be solved by the present invention is that, in view of the deficiencies of the prior art, a PF value of a voltage conversion device can be improved, an output voltage quality can be improved, and a high frequency pulse on the output side can be filtered, thereby providing a high quality load.
  • the present invention adopts the following technical solutions.
  • An intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance comprising an input unit for supplying a DC voltage, a filtering unit for filtering an output voltage of the input unit, and an output voltage for the filtering unit a PFC boosting unit for performing boost conversion, and: an LLCI isolated converter unit including a first switching transistor, a second switching transistor, a transformer, a first diode, a second diode, and a first filter inductor, The drain of the first switch tube is connected to the output end of the PFC boost unit, the source of the first switch tube is connected to the first end of the primary winding of the transformer, and the second end of the primary winding of the transformer passes the first end The capacitor is connected to the front end, the drain of the second switch tube is connected to the first end of the primary winding of the transformer, and the source of the second switch tube is connected to the front end through a third resistor, the first switch tube
  • the gates of the gates and the second switching tubes are used to load two PWM pulse signals of opposite phases
  • a first resistor is connected between the gate and the source of the fourth switching transistor, and a second resistor is connected between the gate and the source of the fifth switching transistor.
  • the input unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppresses the inductance.
  • the front end is connected in parallel to the socket, the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, and the input ends of the safety capacitor and the rectifier bridge are parallel to the rear end of the common mode suppression inductor, and the filtering unit includes a filter capacitor.
  • the filter capacitor is connected in parallel to the output of the rectifier bridge.
  • the PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifier diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the input unit, the boosting inductor
  • the back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube
  • the drain is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.
  • 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 unit and the MCU control unit, wherein the AC sampling unit is configured to collect the voltage of the AC side of the input unit and feed back to the MCU control unit.
  • the AC sampling unit includes an operational amplifier, and the two input terminals of the operational amplifier respectively pass the current limiting resistor And connected to the input end of the input unit, the output 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 second end of the primary winding of the transformer is connected to the MCU control unit to enable the MCU control unit to acquire an electrical signal of the primary winding of the transformer.
  • 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 output by the LLC isolated converter unit by the second sampling resistor and the third sampling resistor.
  • the DC voltage provided by the input unit is filtered by the filtering unit, and then boosted and converted by the PFC boosting unit, and then transmitted to the LLC isolated converter unit.
  • the first switching transistor, the second switching transistor, the first capacitor, the leakage inductance of the primary of the transformer, and the primary magnetizing inductance constitute an LLC resonant circuit, thereby transmitting power to the secondary coil of the transformer, through the A diode and a second diode are rectified into two DC levels in opposite directions, and then filtered by a filter inductor, a second capacitor, and a third capacitor to form a DC voltage including positive and negative directions, and the primary and secondary of the transformer are changed.
  • the turns ratio can adjust the level of the output voltage to achieve 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 second filter inductor at the output end of the inverter inverting unit, and the second filter inductor can filter out the high frequency pulse in the output signal of the inverter inverting unit, so that the load can obtain high quality. Power frequency sinusoidal AC, which in turn improves the output voltage quality to meet power supply requirements.
  • FIG. 1 is a schematic diagram of a half 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 half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3, and includes an input unit 10 for supplying a DC voltage and an output for the input unit 10. Voltage into The line filtering filter unit 20, the PFC boosting unit 30 for boosting the output voltage of the filtering unit 20, and:
  • An LLC isolated converter unit 40 includes a first switching transistor Q6, a second switching transistor Q7, a transformer T1, a first diode D5, a second diode D6, and a first filter inductor L3, the first switch
  • the drain of the transistor Q6 is connected to the output end of the PFC boosting unit 30, the source of the first switching transistor 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 passes the first
  • the capacitor C4 is connected to the front end, the drain of the second switch Q7 is connected to the first end of the primary winding of the transformer T1, and the source of the second switch Q7 is connected to the front end through the third resistor R2B.
  • the gate of the first switching transistor Q6 and the gate of the second switching transistor 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.
  • the intermediate tap of the secondary winding of the transformer T1 is connected to the rear end, the first end of the secondary winding of the transformer T1 is connected to the cathode of the first diode D5, and the anode of the first diode D5 is passed through the second capacitor C7 is connected to the back end, and the second end of the secondary winding of the transformer T1 is connected to the second pole
  • the anode of the tube D6, the cathode of the second diode D6 is connected to the front end of the first filter inductor L3, and the rear end of the first filter inductor L3 is connected to the back end through the third capacitor C8, the first a rear end of the filter inductor L3 and an anode of the first diode D5 as an output end of the LLC isolation converter unit 40;
  • An inverter inverting unit 60 includes a fourth switching transistor Q2, a fifth switching transistor Q4, a third electrolytic capacitor C3, a fourth electrolytic capacitor C5 and a second filter inductor L4, and the drain of the fourth switching transistor Q2 Connected to the positive terminal of the output of the LLC isolating converter unit 40, the source of the fourth switching transistor Q2 is connected to the drain of the fifth switching transistor Q4, and the source of the fifth switching transistor Q4 is connected to the LLC isolating converter.
  • the output terminal of the unit 40 is negative, the gate of the fourth switching transistor Q2 and the gate of the fifth switching transistor Q4 are respectively used to access two PWM pulse signals of opposite phases, and the positive connection of the third electrolytic capacitor C3
  • the anode of the third electrolytic capacitor C3 is connected to the rear end of the fourth switching transistor Q2, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5, the fourth electrolytic capacitor.
  • the cathode of C5 is connected to the source of the fifth switching transistor Q4, the source of the fourth switching transistor Q2 is connected to the front end of the second filter inductor L4, the rear end of the second filter inductor L4 and the third electrolytic capacitor C3.
  • the negative pole serves as the output of the inverter inverter unit 60.
  • the DC voltage supplied from the input unit 10 is filtered by the filtering unit 20, and then boosted and converted by the PFC boosting unit 30, and then transmitted to the LLC isolated converter unit 40, in the LLC isolating converter.
  • the first switching transistor Q6, the second switching transistor Q7, the first capacitor C4, the primary leakage inductance of the transformer T1 and the primary magnetizing inductance constitute an LLC resonant circuit, thereby transmitting power to the secondary coil of the transformer T1, through the A diode D5 and a second diode D6 are rectified into two DC levels in opposite directions, and then filtered into a DC voltage including positive and negative directions through the filter inductor L3, the second capacitor C7, and the third capacitor C8, and passed through By changing the turns ratio of the primary and secondary of the transformer T1, the output voltage can be adjusted to achieve boost or buck conversion.
  • the present invention is not only real The isolated transmission of the voltage, thereby increasing the PF value of the boost/buck converter, and improving the output voltage quality, make the voltage conversion process more secure and reliable.
  • the second filter inductor L4 is disposed at the output end of the inverter inverter unit 60, and the high-frequency pulse in the output signal of the inverter inverter unit can be filtered by the second filter inductor L4, so that the load can be Obtain high-quality power frequency sinusoidal AC power to improve output voltage quality to meet power supply requirements.
  • the operating principle of the inverter inverting unit 60 is: when the fourth switching transistor Q2 is turned on, the fourth switching transistor Q2, the load, and the fourth electrolytic capacitor C5 form a loop, and the first one is generated.
  • the high frequency pulse level is applied to the load.
  • the fourth switching tube Q2 is turned off, the freewheeling circuit is formed by the fourth electrolytic capacitor C5, the body diode of the fifth switching transistor Q4, and the second filter inductor L4; when the fifth switching transistor Q4 leads The loop is formed through the fifth switch tube Q4, the load, and the third electrolytic capacitor C3, and a second high-frequency pulse level is formed on the load.
  • the fourth switch tube Q2 When the fifth switch tube Q4 is turned off, the fourth switch tube Q2 is The body diode, the third electrolytic capacitor C3, the load, and the second filter inductor L4 form a freewheeling circuit.
  • the high frequency driving PWM signal of the fourth switching transistor Q2 and the fifth switching transistor Q4 is sinusoidally modulated by the power frequency and then sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4.
  • the current flowing through the fourth switching transistor Q2 and the fifth switching transistor Q4 is sinusoidal. Since the second filter inductor L4 has a high impedance characteristic for the high frequency pulse, the high frequency component is filtered by the second filter inductor L4, and a power frequency sinusoidal alternating voltage is formed on the load.
  • the third electrolytic capacitor C3 and the fourth electrolytic capacitor C5 also have a filtering function, and can form a DC filter circuit with the first filter inductor L3.
  • the inverter circuit is simple in control, and the circuit uses only two MOS tubes, which is low in cost.
  • a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a gate is connected between the gate and the source of the fifth switching transistor Q4.
  • Two resistors R23 are connected between the gate and the source of the fourth switching transistor Q2, and a gate is connected between the gate and the source of the fifth switching transistor Q4.
  • the input unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1.
  • the fuse F2 is connected in series to the neutral or fire 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, and the input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are connected in parallel to the common mode suppression inductor.
  • the back end of L1, the filtering unit 20 includes a filter capacitor C1, which is connected in parallel to the output end of the rectifier bridge DB1.
  • 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 input unit 10.
  • the output end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 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.
  • the PFC boosting unit 30 if the filter capacitor C1 outputs a half-wave AC voltage, the PFC enters the boost mode to increase the PF value of the AC-to-AC intelligent buck conversion topology circuit, and after boosting, filtering through the second electrolytic capacitor C2.
  • the voltage is 400V.
  • the specific boosting principle is as follows: When the third switching transistor Q5 is turned on, the current on the filter capacitor C1 forms a loop through the boost inductor L2 and the third switch transistor Q5 to GND, and the boost inductor L2 stores energy; When the third switching transistor Q5 is turned off, an induced electromotive force is formed on the boosting inductor which is much higher than the input voltage, and the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the second electrolytic capacitor C2 capacitor. Filtered and filtered into a DC voltage of 400V. And the third switch tube Q5 increases or decreases the on-time of the third switch tube Q5 according to the change of the input AC correction wave acquired by the control chip, so that the current and the voltage phase are aligned to increase the PF value.
  • the embodiment further includes an MCU control unit 80, a gate of the first switch tube Q6, a gate of the second switch tube Q7, and a gate of the third switch tube Q5.
  • the poles are respectively connected to the MCU control unit 80, and the MCU control unit 80 is configured to respectively output PWM signals to the first 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 switch tube Q7 and the third switch tube Q5 are in an on-off state.
  • the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
  • an AC sampling unit 70 is further included.
  • the AC sampling unit 70 is connected between the input end of the input unit 10 and the MCU control unit 80.
  • the AC sampling unit is The 70 is used to collect the voltage on the AC side of the input unit 10 and feed back to the MCU control unit 80.
  • the AC sampling unit 70 includes an operational amplifier U9B.
  • the two input ends of the operational amplifier U9B are respectively connected to the input end of the input unit 10 through a current limiting resistor, and the output end of the operational amplifier U9B is connected to 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 second end of the primary winding of the transformer T1 is connected to the MCU control unit 80 to cause the MCU control unit 80 to collect an electrical signal of the primary winding of the transformer T1.
  • the embodiment further includes a DC voltage sampling unit 50, the DC voltage sampling unit 50 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series, and the second sampling resistor R13
  • the front end is connected to the output end of the LLC isolation converter unit 40
  • the rear end of the third sampling resistor R15 is connected to the MCU control unit 80
  • the MCU control unit is controlled by the second sampling resistor R13 and the third sampling resistor R15.
  • 80 acquires an electrical signal output by the LLC isolated converter unit 40.
  • the invention discloses a PFC-based, LLC and half-bridge sinusoidal voltage conversion circuit with high PF value, power grid and The output is isolated and the security is very high.
  • the invention can automatically adjust the output voltage in the input full voltage range, and fix the output frequency, and the output voltage is pure sine wave output, and has an automatic shaping function for the alternating voltage.
  • the circuit of the invention is simple and convenient to control, and comprises a voltage and current sampling circuit, which can effectively prevent surge voltage and current.

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

Abstract

A PFC and LLC resonance-based smart half bridge sine wave voltage conversion circuit, comprising: an input unit (10), a filtering unit (20), and a PFC boost unit (30); an LLC isolation converter unit (40), comprising a first switch tube (Q6), a second switch tube (Q7), a transformer (T1), a first diode (D5), a second diode (D6), and a first filtering inductor (L3); an inverted phase inverting unit (60), comprising a fourth switch tube (Q2), a fifth switch tube (Q4), a third electrolytic capacitor (C3), a fourth electrolytic capacitor (C5), and a second filtering inductor (L4), wherein a source of the fourth switch tube (Q2) is connected to a drain of the fifth switch tube (Q4), and the positive pole of the third electrolytic capacitor (C3) is connected to a drain of the fourth switch tube (Q2), while the negative pole of the third electrolytic capacitor (C3) is further connected to the positive pole of the fourth electrolytic capacitor (C5), and the source of the fourth switch tube (Q2) is connected to a front end of the second filtering inductor (L4). Said voltage conversion circuit may improve PF values and the quality of outputted voltage.

Description

基于PFC与LLC谐振的智能半桥正弦波电压转换电路Intelligent half-bridge sine wave 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谐振的智能半桥正弦波电压转换电路。The invention relates to a voltage conversion circuit, in particular to an intelligent half 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，电压转换电路是其关键电路，是一种能实现AC-AC变换的电路，可以在AC-AC变换中实现升降压并稳定电压与频率的功能。然而目前的AC-AC便隽式设备市场大多数为非隔离型的拓扑电路，且PF值低、输出电压质量低、安全可靠性差。实际应用中，由于电压转换过程中存在开关管的高速切换，使得电路的输出侧会存在一定的高频脉冲信号，进而影响输出电压的质量，因而难以满足转换要求。In the prior art, the intelligent buck-boost conversion device from AC to AC is also called a travel plug. In this device, the voltage conversion circuit is a key circuit thereof, and is a circuit capable of realizing AC-AC conversion, which can be AC-AC conversion realizes the function of buck-boost and stabilizes voltage and frequency. 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，提供一种可提高电压转换装置的PF值、可提高输出电压质量，并且能够滤除输出侧的高频脉冲，进而为负载提供优质工频正弦交流电的半桥正弦波电压转换电路。The technical problem to be solved by the present invention is that, in view of the deficiencies of the prior art, a PF value of a voltage conversion device can be improved, an output voltage quality can be improved, and a high frequency pulse on the output side can be filtered, thereby providing a high quality load. Half-bridge sine wave voltage conversion circuit for power frequency sinusoidal alternating current.
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谐振的智能半桥正弦波电压转换电路，其包括有用于提供直流电压的输入单元、用于对输入单元的输出电压进行滤波的滤波单元、用于对滤波单元的输出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、变压器、第一二极管、第二二极管和第一滤波电感，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通过第一电容连接于前端地，所述第二开关管的漏极连接于变压器初级绕组的第一端，所述第二开关管的源极通过第三电阻连接于前端地，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，所述变压器次级绕组的中间抽头连接于后端地，所述变压器次级绕组的第一端连接于第一二极管的阴极，所述第一二极管的阳极通过第二电容连接于后端地，所述变压器次级绕组的第二端连接于第二二极管的阳极，所述第二二极管的阴极连接于第一 滤波电感的前端，所述第一滤波电感的后端通过第三电容连接于后端地，所述第一滤波电感的后端和第一二极管的阳极作为LLC隔离变换器单元的输出端；一逆变倒相单元，包括有第四开关管、第五开关管、第三电解电容、第四电解电容和第二滤波电感，所述第四开关管的漏极连接于LLC隔离变换器单元的输出端正极，所述第四开关管的源极连接于第五开关管的漏极，所述第五开关管的源极连接于LLC隔离变换器单元的输出端负极，所述第四开关管的栅极和第五开关管的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第三电解电容的正极连接于第四开关管的漏极，所述第三电解电容的负极连接后端地，所述第三电解电容的负极还连接于第四电解电容的正极，所述第四电解电容的负极连接于第五开关管的源极，所述第四开关管的源极连接于第二滤波电感的前端，所述第二滤波电感的后端和第三电解电容的负极作为逆变倒相单元的输出端。An intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, comprising an input unit for supplying a DC voltage, a filtering unit for filtering an output voltage of the input unit, and an output voltage for the filtering unit a PFC boosting unit for performing boost conversion, and: an LLCI isolated converter unit including a first switching transistor, a second switching transistor, a transformer, a first diode, a second diode, and a first filter inductor, The drain of the first switch tube is connected to the output end of the PFC boost unit, the source of the first switch tube is connected to the first end of the primary winding of the transformer, and the second end of the primary winding of the transformer passes the first end The capacitor is connected to the front end, the drain of the second switch tube is connected to the first end of the primary winding of the transformer, and the source of the second switch tube is connected to the front end through a third resistor, the first switch tube The gates of the gates and the second switching tubes are used to load two PWM pulse signals of opposite phases to alternately conduct the first switching transistor and the second switching transistor, and the intermediate tap of the secondary winding of the transformer At a rear end, a first end of the transformer secondary winding is coupled to a cathode of the first diode, and an anode of the first diode is coupled to a back end via a second capacitor, the transformer secondary winding The second end is connected to the anode of the second diode, and the cathode of the second diode is connected to the first a front end of the filter inductor, a rear end of the first filter inductor is connected to the back end through a third capacitor, and a rear end of the first filter inductor and an anode of the first diode serve as an output end of the LLC isolation converter unit An inverter inverter unit includes a fourth switch tube, a fifth switch tube, a third electrolytic capacitor, a fourth electrolytic capacitor and a second filter inductor, and a drain of the fourth switch tube is connected to the LLC isolating converter The output end of the unit is positive, the source of the fourth switch is connected to the drain of the fifth switch, and the source of the fifth switch is connected to the output negative of the LLC isolating converter unit, the fourth The gate of the switch tube and the gate of the fifth switch tube are respectively used to access two PWM pulse signals of opposite phase, the positive electrode of the third electrolytic capacitor is connected to the drain of the fourth switch tube, and the third electrolysis The cathode of the capacitor is connected to the back end, the cathode of the third electrolytic capacitor is also connected to the anode of the fourth electrolytic capacitor, and the cathode of the fourth electrolytic capacitor is connected to the source of the fifth switching transistor, the fourth switching transistor The source is connected to the second filter A front end, a rear end of the second filtering inductor and the negative electrode of the electrolytic capacitor of the third inverter as an inverter output terminal of the 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.
优选地，所述输入单元包括有插座、保险、防雷电阻、共模抑制电感、安规电容和整流桥，所述保险串接于插座的零线或火线上，所述共模抑制电感的前端并联于插座，所述防雷电阻并联于共模抑制电感的前端，所述安规电容和整流桥的输入端均并联于共模抑制电感的后端，所述滤波单元包括有滤波电容，所述滤波电容并联于整流桥的输出端。Preferably, the input unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppresses the inductance. The front end is connected in parallel to the socket, the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, and the input ends of the safety capacitor and the rectifier bridge are parallel to the rear end of the common mode suppression inductor, and the filtering unit includes a filter capacitor. The filter capacitor is connected in parallel to the output of the rectifier bridge.
优选地，所述PFC升压单元包括有升压电感、第三开关管、第一整流二极管和第二电解电容，所述升压电感的前端连接于输入单元的输出端，所述升压电感的后端连接于第三开关管的漏极，所述第三开关管的源极接前端地，所述第三开关管的栅极用于接入一路PWM控制信号，所述第三开关管的漏极连接第一整流二极管的阳极，所述第一整流二极管的阴极作为PFC升压单元的输出端，且该第一整流二极管的阴极连接第二电解电容的正极，第二电解电容的负极接前端地。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 input unit, the boosting inductor The back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube The drain is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.
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单元的输入端与MCU控制单元之间，所述交流采样单元用于采集输入单元交流侧的电压并反馈至MCU控制单元。Preferably, the method further includes an AC sampling unit connected between the input end of the input unit and the MCU control unit, wherein the AC sampling unit is configured to collect the voltage of the AC side of the input unit and feed back to the MCU control unit.
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 the two input terminals of the operational amplifier respectively pass the current limiting resistor And connected to the input end of the input unit, the output 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，所述变压器初级绕组的第二端连接于MCU控制单元，以令MCU控制单元采集变压器初级绕组的电信号。Preferably, the second end of the primary winding of the transformer is connected to the MCU control unit to enable the MCU control unit to acquire an electrical signal of the primary winding of the transformer.
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 output by the LLC isolated converter unit by the second sampling resistor and the third sampling resistor.
本发明公开的基于PFC与LLC谐振的智能半桥正弦波电压转换电路中，输入单元提供的直流电压经过滤波单元滤波后，由PFC升压单元进行升压转换，之后传输至LLC隔离变换器单元，在LLC隔离变换器单元中，第一开关管、第二开关管、第一电容、变压器初级的漏感及初级励磁电感组成LLC谐振电路，从而将功率传输给变压器的次级线圈，通过第一二极管、第二二极管整流成两个反方向的直流电平，再通过滤波电感、第二电容、第三电容而滤波成包含正负方向的直流电压，并通过改变变压器初次级的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元的输出端设置了第二滤波电感，利用第二滤波电感可滤除逆变倒相单元输出信号中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。In the intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance disclosed in the present invention, the DC voltage provided by the input unit is filtered by the filtering unit, and then boosted and converted by the PFC boosting unit, and then transmitted to the LLC isolated converter unit. In the LLC isolated converter unit, the first switching transistor, the second switching transistor, the first capacitor, the leakage inductance of the primary of the transformer, and the primary magnetizing inductance constitute an LLC resonant circuit, thereby transmitting power to the secondary coil of the transformer, through the A diode and a second diode are rectified into two DC levels in opposite directions, and then filtered by a filter inductor, a second capacitor, and a third capacitor to form a DC voltage including positive and negative directions, and the primary and secondary of the transformer are changed. The turns ratio can adjust the level of the output voltage to achieve 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 the above, the invention provides a second filter inductor at the output end of the inverter inverting unit, and the second filter inductor can filter out the high frequency pulse in the output signal of the inverter inverting unit, so that the load can obtain high quality. Power frequency sinusoidal AC, which in turn improves the output voltage quality to meet power supply requirements.
附图说明DRAWINGS
图1为本发明半桥正弦波电压转换电路的原理图。1 is a schematic diagram of a half 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谐振的智能半桥正弦波电压转换电路，结合图1至图3所示，其包括有用于提供直流电压的输入单元10、用于对输入单元10的输出电压进 行滤波的滤波单元20、用于对滤波单元20的输出电压进行升压转换的PFC升压单元30，以及：The invention discloses an intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3, and includes an input unit 10 for supplying a DC voltage and an output for the input unit 10. Voltage into The line filtering filter unit 20, the PFC boosting unit 30 for boosting the output voltage of 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、变压器T1、第一二极管D5、第二二极管D6和第一滤波电感L3，所述第一开关管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初级绕组的第一端，所述变压器T1初级绕组的第二端通过第一电容C4连接于前端地，所述第二开关管Q7的漏极连接于变压器T1初级绕组的第一端，所述第二开关管Q7的源极通过第三电阻R2B连接于前端地，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次级绕组的中间抽头连接于后端地，所述变压器T1次级绕组的第一端连接于第一二极管D5的阴极，所述第一二极管D5的阳极通过第二电容C7连接于后端地，所述变压器T1次级绕组的第二端连接于第二二极管D6的阳极，所述第二二极管D6的阴极连接于第一滤波电感L3的前端，所述第一滤波电感L3的后端通过第三电容C8连接于后端地，所述第一滤波电感L3的后端和第一二极管D5的阳极作为LLC隔离变换器单元40的输出端；An LLC isolated converter unit 40 includes a first switching transistor Q6, a second switching transistor Q7, a transformer T1, a first diode D5, a second diode D6, and a first filter inductor L3, the first switch The drain of the transistor Q6 is connected to the output end of the PFC boosting unit 30, the source of the first switching transistor 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 passes the first The capacitor C4 is connected to the front end, the drain of the second switch Q7 is connected to the first end of the primary winding of the transformer T1, and the source of the second switch Q7 is connected to the front end through the third resistor R2B. The gate of the first switching transistor Q6 and the gate of the second switching transistor 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. The intermediate tap of the secondary winding of the transformer T1 is connected to the rear end, the first end of the secondary winding of the transformer T1 is connected to the cathode of the first diode D5, and the anode of the first diode D5 is passed through the second capacitor C7 is connected to the back end, and the second end of the secondary winding of the transformer T1 is connected to the second pole The anode of the tube D6, the cathode of the second diode D6 is connected to the front end of the first filter inductor L3, and the rear end of the first filter inductor L3 is connected to the back end through the third capacitor C8, the first a rear end of the filter inductor L3 and an anode of the first diode D5 as an output end of the LLC isolation converter unit 40;
一逆变倒相单元60，包括有第四开关管Q2、第五开关管Q4、第三电解电容C3、第四电解电容C5和第二滤波电感L4，所述第四开关管Q2的漏极连接于LLC隔离变换器单元40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LLC隔离变换器单元40的输出端负极，所述第四开关管Q2的栅极和第五开关管Q4的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第三电解电容C3的正极连接于第四开关管Q2的漏极，所述第三电解电容C3的负极连接后端地，所述第三电解电容C3的负极还连接于第四电解电容C5的正极，所述第四电解电容C5的负极连接于第五开关管Q4的源极，所述第四开关管Q2的源极连接于第二滤波电感L4的前端，所述第二滤波电感L4的后端和第三电解电容C3的负极作为逆变倒相单元60的输出端。An inverter inverting unit 60 includes a fourth switching transistor Q2, a fifth switching transistor Q4, a third electrolytic capacitor C3, a fourth electrolytic capacitor C5 and a second filter inductor L4, and the drain of the fourth switching transistor Q2 Connected to the positive terminal of the output of the LLC isolating converter unit 40, the source of the fourth switching transistor Q2 is connected to the drain of the fifth switching transistor Q4, and the source of the fifth switching transistor Q4 is connected to the LLC isolating converter. The output terminal of the unit 40 is negative, the gate of the fourth switching transistor Q2 and the gate of the fifth switching transistor Q4 are respectively used to access two PWM pulse signals of opposite phases, and the positive connection of the third electrolytic capacitor C3 The anode of the third electrolytic capacitor C3 is connected to the rear end of the fourth switching transistor Q2, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5, the fourth electrolytic capacitor. The cathode of C5 is connected to the source of the fifth switching transistor Q4, the source of the fourth switching transistor Q2 is connected to the front end of the second filter inductor L4, the rear end of the second filter inductor L4 and the third electrolytic capacitor C3. The negative pole serves as the output of the inverter inverter unit 60.
上述半桥正弦波电压转换电路中，输入单元10提供的直流电压经过滤波单元20滤波后，由PFC升压单元30进行升压转换，之后传输至LLC隔离变换器单元40，在LLC隔离变换器单元40中，第一开关管Q6、第二开关管Q7、第一电容C4、变压器T1初级的漏感及初级励磁电感组成LLC谐振电路，从而将功率传输给变压器T1的次级线圈，通过第一二极管D5、第二二极管D6整流成两个反方向的直流电平，再通过滤波电感L3、第二电容C7、第三电容C8而滤波成包含正负方向的直流电压，并通过改变变压器T1初次级的匝数比，可以调整输出电压的高低，进而实现升压或者降压转换。基于上述结构，本发明不仅实 现了电压的隔离传输，进而提高升压/降压转换装置的PF值，还提高了输出电压质量，使得电压转换过程更加安全可靠。在此基础上，本发明在逆变倒相单元60的输出端设置了第二滤波电感L4，利用第二滤波电感L4可滤除逆变倒相单元输出信号中的高频脉冲，使得负载能够获得优质的工频正弦交流电，进而提高输出电压质量，以满足供电需求。In the above-mentioned half-bridge sinusoidal voltage conversion circuit, the DC voltage supplied from the input unit 10 is filtered by the filtering unit 20, and then boosted and converted by the PFC boosting unit 30, and then transmitted to the LLC isolated converter unit 40, in the LLC isolating converter. In unit 40, the first switching transistor Q6, the second switching transistor Q7, the first capacitor C4, the primary leakage inductance of the transformer T1 and the primary magnetizing inductance constitute an LLC resonant circuit, thereby transmitting power to the secondary coil of the transformer T1, through the A diode D5 and a second diode D6 are rectified into two DC levels in opposite directions, and then filtered into a DC voltage including positive and negative directions through the filter inductor L3, the second capacitor C7, and the third capacitor C8, and passed through By changing the turns ratio of the primary and secondary of the transformer T1, the output voltage can be adjusted to achieve boost or buck conversion. Based on the above structure, the present invention is not only real The isolated transmission of the voltage, thereby increasing the PF value of the boost/buck converter, and improving the output voltage quality, make the voltage conversion process more secure and reliable. On the basis of the present invention, the second filter inductor L4 is disposed at the output end of the inverter inverter unit 60, and the high-frequency pulse in the output signal of the inverter inverter unit can be filtered by the second filter inductor L4, so that the load can be Obtain high-quality power frequency sinusoidal AC power to improve output voltage quality to meet power supply requirements.
进一步地，如图1所示，逆变倒相单元60的工作原理为：当第四开关管Q2导通时，第四开关管Q2、负载、第四电解电容C5形成回路，产生第一个高频脉冲电平给负载，当第四开关管Q2关闭时，通过第四电解电容C5、第五开关管Q4的体二极管、第二滤波电感L4形成续流回路；当第五开关管Q4导通时通过第五开关管Q4、负载、第三电解电容C3形成回路，在负载上就形成了第二个高频脉冲电平，当第五开关管Q4关断时，第四开关管Q2的体二极管、第三电解电容C3、负载、第二滤波电感L4形成续流回路。第四开关管Q2、第五开关管Q4的高频驱动PWM信号是经工频正弦调制后再送给第四开关管Q2、第五开关管Q4的GATE极。流经第四开关管Q2、第五开关管Q4的电流是按正弦变化的。由于第二滤波电感L4对高频脉冲具有高阻抗特性，所以高频分量被第二滤波电感L4滤除，在负载上就形成了工频正弦交流电压。同时第三电解电容C3、第四电解电容C5还有滤波的作用，可以与第一滤波电感L3组成直流滤波电路。该逆变电路控制简单，电路只用两个MOS管，成本低廉。Further, as shown in FIG. 1, the operating principle of the inverter inverting unit 60 is: when the fourth switching transistor Q2 is turned on, the fourth switching transistor Q2, the load, and the fourth electrolytic capacitor C5 form a loop, and the first one is generated. The high frequency pulse level is applied to the load. When the fourth switching tube Q2 is turned off, the freewheeling circuit is formed by the fourth electrolytic capacitor C5, the body diode of the fifth switching transistor Q4, and the second filter inductor L4; when the fifth switching transistor Q4 leads The loop is formed through the fifth switch tube Q4, the load, and the third electrolytic capacitor C3, and a second high-frequency pulse level is formed on the load. When the fifth switch tube Q4 is turned off, the fourth switch tube Q2 is The body diode, the third electrolytic capacitor C3, the load, and the second filter inductor L4 form a freewheeling circuit. The high frequency driving PWM signal of the fourth switching transistor Q2 and the fifth switching transistor Q4 is sinusoidally modulated by the power frequency and then sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4. The current flowing through the fourth switching transistor Q2 and the fifth switching transistor Q4 is sinusoidal. Since the second filter inductor L4 has a high impedance characteristic for the high frequency pulse, the high frequency component is filtered by the second filter inductor L4, and a power frequency sinusoidal alternating voltage is formed on the load. At the same time, the third electrolytic capacitor C3 and the fourth electrolytic capacitor C5 also have a filtering function, and can form a DC filter circuit with the first filter inductor L3. The inverter circuit is simple in control, and the circuit uses only two MOS tubes, which is low in cost.
本实施例中，为了提高开关速度，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。In this embodiment, in order to increase the switching speed, a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a gate is connected between the gate and the source of the fifth switching transistor Q4. Two resistors R23.
关于输入部分，所述输入单元10包括有插座、保险F2、防雷电阻RV1、共模抑制电感L1、安规电容CX1和整流桥DB1，所述保险F2串接于插座的零线或火线上，所述共模抑制电感L1的前端并联于插座，所述防雷电阻RV1并联于共模抑制电感L1的前端，所述安规电容CX1和整流桥DB1的输入端均并联于共模抑制电感L1的后端，所述滤波单元20包括有滤波电容C1，所述滤波电容C1并联于整流桥DB1的输出端。Regarding the input portion, the input unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1. The fuse F2 is connected in series to the neutral or fire 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, and the input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are connected in parallel to the common mode suppression inductor. The back end of L1, the filtering unit 20 includes a filter capacitor C1, which is connected in parallel to the output end of the rectifier bridge DB1.
关于升压部分，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的前端连接于输入单元10的输出端，所述升压电感L2的后端连接于第三开关管Q5的漏极，所述第三开关管Q5的源极接前端地，所述第三开关管Q5的栅极用于接入一路PWM控制信号，所述第三开关管Q5的漏极连接第一整流二极管D1的阳极，所述第一整流二极管D1的阴极作为PFC升压单元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。 Regarding the boosting portion, 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 input unit 10. The output end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 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.
上述PFC升压单元30中，若滤波电容C1输出半波交流电压，PFC进入升压模式，以提高AC转AC智能降压转换拓扑电路的PF值，升压后通过第二电解电容C2滤波后的电压为400V，具体的升压原理如下：第三开关管Q5导通时，滤波电容C1上的电流经升压电感L2、第三开关管Q5到GND形成回路，升压电感L2储存能量；当第三开关管Q5关断时，升压电感上会形成比输入电压高得多的感应电动势，感应电动势经续流管D1进行整流后形成单向脉冲电压再送给第二电解电容C2电容进滤波，滤波成400V的直流电压。并且第三开关管Q5是根据控制芯片采到的输入交流修正波变化来加大或减少第三开关管Q5的导通时间，以使电流与电压相位变一致来提高PF值。In the PFC boosting unit 30, if the filter capacitor C1 outputs a half-wave AC voltage, the PFC enters the boost mode to increase the PF value of the AC-to-AC intelligent buck conversion topology circuit, and after boosting, filtering through the second electrolytic capacitor C2. The voltage is 400V. The specific boosting principle is as follows: When the third switching transistor Q5 is turned on, the current on the filter capacitor C1 forms a loop through the boost inductor L2 and the third switch transistor Q5 to GND, and the boost inductor L2 stores energy; When the third switching transistor Q5 is turned off, an induced electromotive force is formed on the boosting inductor which is much higher than the input voltage, and the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the second electrolytic capacitor C2 capacitor. Filtered and filtered into a DC voltage of 400V. And the third switch tube Q5 increases or decreases the on-time of the third switch tube Q5 according to the change of the input AC correction wave acquired by the control chip, so that the current and the voltage phase are aligned to increase the PF value.
作为一种优选方式，如图3所示，本实施例还包括有一MCU控制单元80，所述第一开关管Q6的栅极、第二开关管Q7的栅极和第三开关管Q5的栅极分别连接于MCU控制单元80，所述MCU控制单元80用于分别输出PWM信号至第一开关管Q6、第二开关管Q7和第三开关管Q5，以控制第一开关管Q6、第二开关管Q7和第三开关管Q5通断状态。进一步地，所述MCU控制单元80包括有单片机U1及其外围电路。As shown in FIG. 3, the embodiment further includes an MCU control unit 80, a gate of the first switch tube Q6, a gate of the second switch tube Q7, and a gate of the third switch tube Q5. The poles are respectively connected to the MCU control unit 80, and the MCU control unit 80 is configured to respectively output PWM signals to the first 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 switch tube Q7 and the third switch tube Q5 are in an on-off state. Further, the MCU control unit 80 includes a single chip U1 and its peripheral circuits.
为了便于监测交流侧的电信号，如图2所示，还包括有一交流采样单元70，所述交流采样单元70连接于输入单元10的输入端与MCU控制单元80之间，所述交流采样单元70用于采集输入单元10交流侧的电压并反馈至MCU控制单元80。In order to facilitate monitoring the electrical signal on the AC side, as shown in FIG. 2, an AC sampling unit 70 is further included. The AC sampling unit 70 is connected between the input end of the input unit 10 and the MCU control unit 80. The AC sampling unit is The 70 is used to collect the voltage on the AC side of the input unit 10 and feed back to the MCU control unit 80.
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. The two input ends of the operational amplifier U9B are respectively connected to the input end of the input unit 10 through a current limiting resistor, and the output end of the operational amplifier U9B is connected to 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.
在此基础上，所述变压器T1初级绕组的第二端连接于MCU控制单元80，以令MCU控制单元80采集变压器T1初级绕组的电信号。Based on this, the second end of the primary winding of the transformer T1 is connected to the MCU control unit 80 to cause the MCU control unit 80 to collect an electrical signal of the primary winding of the transformer T1.
作为一种优选方式，本实施例还包括有一DC电压采样单元50，所述DC电压采样单元50包括有依次串联的第二采样电阻R13和第三采样电阻R15，所述第二采样电阻R13的前端连接于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输出的电信号。As a preferred mode, the embodiment further includes a DC voltage sampling unit 50, the DC voltage sampling unit 50 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series, and the second sampling resistor R13 The front end is connected to the output end of the LLC isolation converter unit 40, the rear end of the third sampling resistor R15 is connected to the MCU control unit 80, and the MCU control unit is controlled by the second sampling resistor R13 and the third sampling resistor R15. 80 acquires an electrical signal output by the LLC isolated converter unit 40.
本发明公开的基于PFC、LLC和半桥正弦波电压转换电路，其具有高PF值、电网与 输出端隔离，安全性非常高。本发明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，而输出电压是以纯正弦波输出，对交流电压有自动整形功能。此外，本发明电路简单、控制方便，其包含有电压与电流采样电路，能有效防浪涌电压与电流。The invention discloses a PFC-based, LLC and half-bridge sinusoidal voltage conversion circuit with high PF value, power grid and The output is isolated and the security is very high. The invention can automatically adjust the output voltage in the input full voltage range, and fix the output frequency, and the output voltage is pure sine wave output, and has an automatic shaping function for the alternating voltage. In addition, the circuit of the invention is simple and convenient to control, and comprises a voltage and current sampling circuit, which can effectively 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谐振的智能半桥正弦波电压转换电路，其特征在于，包括有用于提供直流电压的输入单元(10)、用于对输入单元(10)的输出电压进行滤波的滤波单元(20)、用于对滤波单元(20)的输出电压进行升压转换的PFC升压单元(30)，以及：An intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance, characterized in that it comprises an input unit (10) for supplying a DC voltage, and a filtering unit for filtering an output voltage of the input unit (10) (20) A PFC boosting unit (30) for boosting the output voltage of 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)、变压器(T1)、第一二极管(D5)、第二二极管(D6)和第一滤波电感(L3)，所述第一开关管(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)初级绕组的第一端，所述变压器(T1)初级绕组的第二端通过第一电容(C4)连接于前端地，所述第二开关管(Q7)的漏极连接于变压器(T1)初级绕组的第一端，所述第二开关管(Q7)的源极通过第三电阻(R2B)连接于前端地，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)次级绕组的中间抽头连接于后端地，所述变压器(T1)次级绕组的第一端连接于第一二极管(D5)的阴极，所述第一二极管(D5)的阳极通过第二电容(C7)连接于后端地，所述变压器(T1)次级绕组的第二端连接于第二二极管(D6)的阳极，所述第二二极管(D6)的阴极连接于第一滤波电感(L3)的前端，所述第一滤波电感(L3)的后端通过第三电容(C8)连接于后端地，所述第一滤波电感(L3)的后端和第一二极管(D5)的阳极作为LLC隔离变换器单元(40)的输出端；An LLC isolated converter unit (40) includes a first switching transistor (Q6), a second switching transistor (Q7), a transformer (T1), a first diode (D5), and a second diode (D6) And a first filter inductor (L3), a drain of the first switch transistor (Q6) is connected to an output end of the PFC boost unit (30), and a source of the first switch transistor (Q6) is connected to a transformer ( T1) a first end of the primary winding, a second end of the primary winding of the transformer (T1) is connected to the front end through a first capacitor (C4), and a drain of the second switching tube (Q7) is connected to the transformer (T1) a first end of the primary winding, a source of the second switching transistor (Q7) connected to the front end through a third resistor (R2B), a gate of the first switching transistor (Q6) and a second switching transistor ( The gate of Q7) is used to load two PWM pulse signals of opposite phases to alternately conduct the first switching transistor (Q6) and the second switching transistor (Q7), the secondary winding of the transformer (T1) The intermediate tap is connected to the back end, the first end of the secondary winding of the transformer (T1) is connected to the cathode of the first diode (D5), and the anode of the first diode (D5) is passed through the second capacitor (C7) connected to the back end, the change The second end of the secondary winding of the device (T1) is connected to the anode of the second diode (D6), and the cathode of the second diode (D6) is connected to the front end of the first filter inductor (L3), The rear end of the first filter inductor (L3) is connected to the back end through a third capacitor (C8), and the back end of the first filter inductor (L3) and the anode of the first diode (D5) are isolated as LLCs. The output of the unit (40);
    一逆变倒相单元(60)，包括有第四开关管(Q2)、第五开关管(Q4)、第三电解电容(C3)、第四电解电容(C5)和第二滤波电感(L4)，所述第四开关管(Q2)的漏极连接于LLC隔离变换器单元(40)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LLC隔离变换器单元(40)的输出端负极，所述第四开关管(Q2)的栅极和第五开关管(Q4)的栅极分别用于接入两路相位相反的PWM脉冲信号，所述第三电解电容(C3)的正极连接于第四开关管(Q2)的漏极，所述第三电解电容(C3)的负极连接后端地，所述第三电解电容(C3)的负极还连接于第四电解电容(C5)的正极，所述第四电解电容(C5)的负极连接于第五开关管(Q4)的源极，所述第四开关管(Q2)的源极连接于第二滤波电感(L4)的前端，所述第二滤波电感(L4)的后端和第三电解电容(C3)的负极作为逆变倒相单元(60)的输出端。An inverter inverter unit (60) includes a fourth switch tube (Q2), a fifth switch tube (Q4), a third electrolytic capacitor (C3), a fourth electrolytic capacitor (C5), and a second filter inductor (L4) The drain of the fourth switch (Q2) is connected to the positive terminal of the output of the LLC isolating converter unit (40), and the source of the fourth switch (Q2) is connected to the fifth switch (Q4). The drain of the fifth switch transistor (Q4) is connected to the negative terminal of the output of the LLC isolating converter unit (40), the gate of the fourth switch transistor (Q2) and the fifth switch transistor (Q4) The gates are respectively used to access two opposite phase PWM pulse signals, the anode of the third electrolytic capacitor (C3) is connected to the drain of the fourth switching transistor (Q2), and the third electrolytic capacitor (C3) The negative electrode is connected to the rear end, the negative electrode of the third electrolytic capacitor (C3) is also connected to the positive electrode of the fourth electrolytic capacitor (C5), and the negative electrode of the fourth electrolytic capacitor (C5) is connected to the fifth switching transistor ( a source of Q4), a source of the fourth switching transistor (Q2) is connected to a front end of the second filter inductor (L4), a rear end of the second filter inductor (L4), and a third electrolytic capacitor (C3) Negative anode as inverter inverter unit The output of (60).
  2. 如权利要求1所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，所述第四开关管(Q2)的栅极和源极之间连接有第一电阻(R17)，所述第五开关管(Q4)的栅极和源极之间连接有第二电阻(R23)。 The intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, 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).
  3. 如权利要求1所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，所述输入单元(10)包括有插座、保险(F2)、防雷电阻(RV1)、共模抑制电感(L1)、安规电容(CX1)和整流桥(DB1)，所述保险(F2)串接于插座的零线或火线上，所述共模抑制电感(L1)的前端并联于插座，所述防雷电阻(RV1)并联于共模抑制电感(L1)的前端，所述安规电容(CX1)和整流桥(DB1)的输入端均并联于共模抑制电感(L1)的后端，所述滤波单元(20)包括有滤波电容(C1)，所述滤波电容(C1)并联于整流桥(DB1)的输出端。The intelligent half bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein the input unit (10) comprises a socket, a fuse (F2), a lightning protection resistor (RV1), and a total a mode suppression inductor (L1), a safety capacitor (CX1), and a rectifier bridge (DB1), wherein 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 rejection inductor (L1) is connected in parallel 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 to the common mode suppression inductor (L1). At the back end, the filtering unit (20) includes a filter capacitor (C1) connected in parallel to the output of the rectifier bridge (DB1).
  4. 如权利要求1所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，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)的前端连接于输入单元(10)的输出端，所述升压电感(L2)的后端连接于第三开关管(Q5)的漏极，所述第三开关管(Q5)的源极接前端地，所述第三开关管(Q5)的栅极用于接入一路PWM控制信号，所述第三开关管(Q5)的漏极连接第一整流二极管(D1)的阳极，所述第一整流二极管(D1)的阴极作为PFC升压单元(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。The intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein the PFC boosting unit (30) 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 boost inductor (L2) is connected to the output end of the input unit (10), and the back end of the boost inductor (L2) Connected to the drain of the third switch transistor (Q5), the source of the third switch transistor (Q5) is connected to the front end, and the gate of the third switch transistor (Q5) is used to access a PWM control signal. a drain of the third switching transistor (Q5) is connected to an anode of the first rectifier diode (D1), and a cathode of the first rectifier diode (D1) serves as an output end of the PFC boosting unit (30), and the first The cathode of the 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.
  5. 如权利要求4所述的基于PFC与LLC谐振的智能半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(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 half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 4, 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).
  6. 如权利要求5所述的基于PFC与LLC谐振的智能半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(70)，所述交流采样单元(70)连接于输入单元(10)的输入端与MCU控制单元(80)之间，所述交流采样单元(70)用于采集输入单元(10)交流侧的电压并反馈至MCU控制单元(80)。The intelligent half bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 5, further comprising an AC sampling unit (70), wherein the AC sampling unit (70) is connected to the input unit (10) Between the input terminal and the MCU control unit (80), the AC sampling unit (70) is used to collect the voltage of the AC side of the input unit (10) and feed back to the MCU control unit (80).
  7. 如权利要求6所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，所述交流采样单元(70)包括有运放(U9B)，所述运放(U9B)的两个输入端分别通过限流电阻而连接于输入单元(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 half bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 6, 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 terminal of the input unit (10) through a current limiting resistor, and the output terminal of the operational amplifier (U9B) is connected to the MCU control unit (80).
  8. 如权利要求5所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，所述第三开关管(Q5)的源极与前端地之间连接有第一采样电阻(R2A)，所述第三开 关管(Q5)的源极连接于MCU控制单元(80)，藉由所述第一采样电阻(R2A)而令MCU控制单元(80)采集第三开关管(Q5)源极的电信号。The intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 5, wherein a first sampling resistor is connected between a source and a front end of the third switching transistor (Q5). R2A), the third opening The source of the switch (Q5) is connected to the MCU control unit (80), and the MCU control unit (80) acquires an electrical signal of the source of the third switch (Q5) by the first sampling resistor (R2A).
  9. 如权利要求5所述的基于PFC与LLC谐振的智能半桥正弦波电压转换电路，其特征在于，所述变压器(T1)初级绕组的第二端连接于MCU控制单元(80)，以令MCU控制单元(80)采集变压器(T1)初级绕组的电信号。The intelligent half bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 5, wherein the second end of the primary winding of the transformer (T1) is connected to the MCU control unit (80) to make the MCU The control unit (80) collects electrical signals from the primary winding of the transformer (T1).
  10. 如权利要求5所述的基于PFC与LLC谐振的智能半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(50)，所述DC电压采样单元(50)包括有依次串联的第二采样电阻(R13)和第三采样电阻(R15)，所述第二采样电阻(R13)的前端连接于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)输出的电信号。 The intelligent half-bridge sinusoidal voltage conversion circuit based on PFC and LLC resonance according to claim 5, further comprising a DC voltage sampling unit (50), wherein the DC voltage sampling unit (50) comprises a serial connection in sequence a second sampling resistor (R13) and a third sampling resistor (R15), a front end of the second sampling resistor (R13) is connected to an output of the LLC isolating converter unit (40), and the third sampling resistor (R15) The back end of the ) is connected to the MCU control unit (80), and the MCU control unit (80) acquires the output of the LLC isolated converter unit (40) by the second sampling resistor (R13) and the third sampling resistor (R15). Electrical signal.
PCT/CN2017/080985 2017-01-04 2017-04-19 Pfc and llc resonance-based smart half bridge sine wave voltage conversion circuit WO2018126557A1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109709368A (en) * 2019-01-16 2019-05-03 中国科学院空间应用工程与技术中心 A pulse sampling isolation circuit
CN109814456A (en) * 2019-02-01 2019-05-28 四维生态科技（杭州）有限公司 A LED lighting control system for a plant factory
CN111064360A (en) * 2020-01-03 2020-04-24 北京物资学院 BUCK converter and control method thereof
CN113839457A (en) * 2021-10-26 2021-12-24 重庆先锋渝州电器有限公司 Charging circuit for intelligent charger
CN114079281A (en) * 2021-11-22 2022-02-22 中国南方电网有限责任公司超高压输电公司广州局 Low-voltage direct current system and power supply system
CN114944776A (en) * 2022-05-28 2022-08-26 郑州大学 A high-gain DC-AC converter for new energy access
CN116207811A (en) * 2022-12-15 2023-06-02 苏州博沃创新能源科技有限公司 7kW bidirectional electric automobile off-vehicle direct current charging module

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113852284A (en) * 2021-08-18 2021-12-28 北京无线电测量研究所 Power supply circuit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040012343A1 (en) * 2002-07-19 2004-01-22 Nostwick Allan Albert Lighting control system with variable arc control including start-up circuit for providing a bias voltage supply
CN101527520A (en) * 2009-01-20 2009-09-09 华南理工大学 Single-stage single-phase AC-DC convertor based on LLC series resonance
CN101902137A (en) * 2009-05-29 2010-12-01 索尼公司 Supply unit
CN102064712A (en) * 2010-12-24 2011-05-18 东南大学 Power electronic transformer based on simple PFC (Power Factor Correction)
CN103117642A (en) * 2012-05-25 2013-05-22 深圳市中兴昆腾有限公司 Control system and method of liquid level control (LLC) resonant converter
CN103296904A (en) * 2012-02-29 2013-09-11 黄煜梅 Power-factor correction constant current controller and control method
CN106787780A (en) * 2017-01-04 2017-05-31 广东百事泰电子商务股份有限公司 Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance
CN206364710U (en) * 2017-01-04 2017-07-28 广东百事泰电子商务股份有限公司 Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106208638A (en) * 2015-04-30 2016-12-07 神华集团有限责任公司 Device for converting electric energy and corresponding electric energy management connection system
CN206620058U (en) * 2017-01-04 2017-11-07 广东百事泰电子商务股份有限公司 Intelligent half-bridge sine voltage change-over circuit based on PFC Yu LLC resonance

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040012343A1 (en) * 2002-07-19 2004-01-22 Nostwick Allan Albert Lighting control system with variable arc control including start-up circuit for providing a bias voltage supply
CN101527520A (en) * 2009-01-20 2009-09-09 华南理工大学 Single-stage single-phase AC-DC convertor based on LLC series resonance
CN101902137A (en) * 2009-05-29 2010-12-01 索尼公司 Supply unit
CN102064712A (en) * 2010-12-24 2011-05-18 东南大学 Power electronic transformer based on simple PFC (Power Factor Correction)
CN103296904A (en) * 2012-02-29 2013-09-11 黄煜梅 Power-factor correction constant current controller and control method
CN103117642A (en) * 2012-05-25 2013-05-22 深圳市中兴昆腾有限公司 Control system and method of liquid level control (LLC) resonant converter
CN106787780A (en) * 2017-01-04 2017-05-31 广东百事泰电子商务股份有限公司 Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance
CN206364710U (en) * 2017-01-04 2017-07-28 广东百事泰电子商务股份有限公司 Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109709368A (en) * 2019-01-16 2019-05-03 中国科学院空间应用工程与技术中心 A pulse sampling isolation circuit
CN109709368B (en) * 2019-01-16 2024-03-22 中国科学院空间应用工程与技术中心 Pulse sampling isolation circuit
CN109814456A (en) * 2019-02-01 2019-05-28 四维生态科技（杭州）有限公司 A LED lighting control system for a plant factory
CN111064360A (en) * 2020-01-03 2020-04-24 北京物资学院 BUCK converter and control method thereof
CN113839457A (en) * 2021-10-26 2021-12-24 重庆先锋渝州电器有限公司 Charging circuit for intelligent charger
CN114079281A (en) * 2021-11-22 2022-02-22 中国南方电网有限责任公司超高压输电公司广州局 Low-voltage direct current system and power supply system
CN114079281B (en) * 2021-11-22 2023-09-26 中国南方电网有限责任公司超高压输电公司广州局 Low-voltage direct current system and power supply system
CN114944776A (en) * 2022-05-28 2022-08-26 郑州大学 A high-gain DC-AC converter for new energy access
CN114944776B (en) * 2022-05-28 2024-03-15 郑州大学 High-gain DC-AC converter for new energy access
CN116207811A (en) * 2022-12-15 2023-06-02 苏州博沃创新能源科技有限公司 7kW bidirectional electric automobile off-vehicle direct current charging module
CN116207811B (en) * 2022-12-15 2024-04-05 苏州博沃创新能源科技有限公司 7kW bidirectional electric automobile off-vehicle direct current charging module

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