WO2018126556A1 - Intelligent half-bridge correction wave voltage conversion circuit based on pfc and llc resonances - Google Patents

Intelligent half-bridge correction wave voltage conversion circuit based on pfc and llc resonances Download PDF

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Publication number
WO2018126556A1
WO2018126556A1 PCT/CN2017/080984 CN2017080984W WO2018126556A1 WO 2018126556 A1 WO2018126556 A1 WO 2018126556A1 CN 2017080984 W CN2017080984 W CN 2017080984W WO 2018126556 A1 WO2018126556 A1 WO 2018126556A1
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Prior art keywords
unit
switching transistor
pfc
llc
output
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PCT/CN2017/080984
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French (fr)
Chinese (zh)
Inventor
李金龙
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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 WO2018126556A1 publication Critical patent/WO2018126556A1/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
    • 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
    • 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
    • H02M3/33561—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 more than one ouput with independent control
    • 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
    • H02M3/338—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 in a self-oscillating arrangement
    • H02M3/3381—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 in a self-oscillating arrangement using a single commutation path
    • 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
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • the invention relates to a voltage conversion circuit, in particular to an intelligent half bridge correction 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.
  • the technical problem to be solved by the present invention is to provide an intelligent half-bridge correction wave voltage based on PFC and LLC resonance which can improve the PF value of the voltage conversion device, improve the output voltage quality, and is safe and reliable. Conversion circuit.
  • the present invention adopts the following technical solutions.
  • An intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance comprising: an input unit for supplying a DC voltage; and a filtering unit connected to an output end of the input unit for outputting the input unit The voltage is filtered; a PFC boosting unit is connected to the output end of the filtering unit for boosting the output voltage of the filtering unit; and an LLC isolation converter unit includes a first switching tube and a second switching tube.
  • a transformer a transformer, a first diode, a second diode and a filter inductor, a drain of the first switch tube is connected to an output end of the PFC boost unit, and a source of the first switch tube is connected to a primary winding of the transformer
  • the first end of the transformer, the second end of the transformer is connected to the front end through a first resonant capacitor, and the drain of the second switch is connected to the first end of the primary winding of the transformer, the second switch
  • the source is connected to the front end through a third resistor, and the gate of the first switch tube and the gate of the second switch tube are used to load two PWM pulse signals of opposite phases to make the first switch tube and
  • the two switch tubes are alternately turned on, the middle tap of the transformer secondary winding is connected to the back end, and the first end of the transformer secondary winding is connected to the cathode of the first diode, the first diode
  • the anode is connected to the rear end through a second capacitor, the
  • 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, and the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, and the input terminals of the safety capacitor and the rectifier bridge are connected in parallel to the rear end of the common mode suppression inductor.
  • the filtering unit comprises a filter capacitor, and the filter capacitor is connected in parallel to the output end 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.
  • 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 inverter inverter unit includes a fourth switch tube, a fifth switch tube, a third electrolytic capacitor, and a fourth An electrolytic capacitor
  • a drain of the fourth switch is connected to an anode of an output of the LLC isolating converter unit
  • a source of the fourth switch is connected to a drain of the fifth switch
  • the fifth switch is The source is connected to the negative terminal of the output of the LLC isolating converter unit
  • the gate of the fourth switch tube and the gate of the fifth switch tube are respectively used to access two PWM pulse signals of opposite phases
  • the third electrolysis The anode of the capacitor is connected to the drain of the fourth switch tube, the cathode of the third electrolytic capacitor is connected to the back end, and the cathode of the third electrolytic capacitor is also connected to the anode of the fourth electrolytic capacitor, the fourth electrolytic capacitor
  • the negative pole is connected to the source of the fifth switching transistor, and the source of the fourth switching transistor and the negative electrode of the third electrolytic capacitor serve as the output end of the
  • 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 resonant 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 first diode and the second diode are rectified into two pulsation levels in opposite directions, and then filtered by the filter inductor, the second capacitor, and the third capacitor into a DC voltage including positive and negative directions, and the transformer is first changed by changing the transformer.
  • the ratio of the turns of the stage 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.
  • FIG. 1 is a schematic diagram of a full bridge modified wave 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 modified wave voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3 and includes:
  • a filtering unit 20 is connected to the output end of the input unit 10 for filtering the output voltage of the input unit 10;
  • a PFC boosting unit 30 is connected to the output end of the filtering unit 20 for performing boost conversion on the output voltage of the filtering unit 20;
  • An LLC isolated converter unit 40 includes a first switching transistor Q6, a second switching transistor Q7, a transformer T1, and a first diode
  • the diode D5, the second diode D6 and the filter inductor L3, the drain of the first switch transistor Q6 is connected to the output end of the PFC boost unit 30, and the source of the first switch transistor Q6 is connected to the transformer T1 primary a first end of the winding, a second end of the primary winding of the transformer T1 is connected to the front end through a first resonant capacitor C4, and a drain of the second switching transistor Q7 is connected to a first end of the primary winding of the transformer T1,
  • the source of the second switching transistor Q7 is connected to the front end through a third resistor R2B, and the gate of the first switching transistor Q6 and the gate of the second switching transistor Q7 are used to load two PWM pulses with opposite phases to
  • the first switch tube Q6 and the second switch tube Q7 are alternately turned on, the middle tap of the secondary winding
  • the cathode of the second diode D6 is connected to the front end of the filter inductor L3, and the filter inductor L3
  • the back end is connected to the back end through a third capacitor C8, and the back end of the filter inductor L3 and the anode of the first diode D5 serve as an output end of the LLC isolation converter unit 40;
  • An inverter inverting unit 60 is connected to the output end of the LLC isolating converter unit 40, and the inverter inverting unit 60 is configured to invert and convert the output voltage of the LLC isolating converter unit 40 to output an alternating current.
  • the DC voltage supplied from the input unit 10 is filtered by the filtering unit 20, subjected to boost conversion by the PFC boosting unit 30, and then transmitted to the LLC isolating converter unit 40, in the LLC isolating converter unit 40.
  • the first switching transistor Q6, the second switching transistor Q7, the first resonant 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 first
  • the diode D5 and the second diode D6 are rectified into two pulsation 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
  • the output voltage can be adjusted to achieve boost or buck conversion.
  • the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.
  • the 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 filtering unit 20 includes a filtering capacitor C1, which is connected in parallel to the output 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.
  • Output, The back 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 to access one PWM.
  • 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 serves as an output end of the PFC boosting unit 30, and a cathode of the first rectifier diode D1
  • the positive electrode of the second electrolytic capacitor C2 is connected, and the negative electrode 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.
  • FIG. 2 further includes an AC sampling unit 70 connected between the input end of the input unit 10 and the MCU control unit 80.
  • the AC sampling unit 70 It is used to collect the voltage of 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, and the DC voltage sampling unit 50 includes a second sampling resistor R13 and a third sampling resistor connected in series. R15, a front end of the second sampling resistor R13 is connected to an output end of the LLC isolation converter unit 40, and a rear end of the third sampling resistor R15 is connected to the MCU control unit 80, by the second sampling resistor R13 and The third sampling resistor R15 causes the MCU control unit 80 to acquire an electrical signal output by the LLC isolated converter unit 40.
  • the inverter inverter unit 60 includes a fourth switch tube Q2 , a fifth switch tube Q4 , a third electrolytic capacitor C3 , and a fourth electrolytic capacitor C5 , and the fourth switch tube
  • the drain of Q2 is 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 output terminal of the LLC isolating converter 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 pulses of opposite phase
  • the anode of C3 is connected to the drain of the fourth switch transistor Q2, the cathode of the third electrolytic capacitor C3 is connected to the rear end, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5.
  • the cathode of the fourth electrolytic capacitor C5 is connected to the source of the fifth switching transistor Q4, and the source of the fourth switching transistor Q2 and the cathode of the third electrolytic capacitor C3 serve as the output terminal of the inverter inverting unit 60.
  • a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a second resistor R23 is connected between the gate and the source of the fifth switching transistor Q4.
  • the filter inductor L3 filters the inductor into a DC voltage
  • the fourth switch tube Q2 the load, and the fourth electrolytic capacitor C4 form a loop to supply power to the load to form a first half-cycle correction wave level
  • the two half-cycle correction wave levels form a loop through the fifth switching transistor Q4, the load, and the third electrolytic capacitor C3, so that a complete power frequency correction wave AC voltage is formed on the load.
  • PWM2H and PWM2L are respectively sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4.
  • the phase and frequency in the inverter inverter circuit operate in accordance with the mode set in the control chip.
  • the third electrolytic capacitor C3 and the fourth electrolytic capacitor C4 also have a filtering function, and can form a filtering circuit with the filter inductor L3.
  • the inverter circuit is simple to control, and the circuit uses only two MOS tubes, and the cost is low.
  • the intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance disclosed in the invention has a high PF value, can realize isolation between the power grid and the output end, and has high security.
  • the output voltage can be automatically adjusted within the input full voltage range, the output frequency can be fixed, and the output voltage is a modified wave output, which has an automatic shaping function for the AC voltage.
  • the circuit of the invention is simple, convenient to control, and contains voltage and current. Sampling circuit to prevent surge voltage and current.

Abstract

An intelligent half-bridge correction wave voltage conversion circuit based on PFC and LLC resonances. The circuit comprises: an input unit (10); a filtering unit (20); a PFC voltage boosting unit(30); an LLC isolated converter unit(40) comprising a first switch tube (Q6), a second switch tube (Q7), a transformer (T), a first diode (D5), a second diode (D6) and a filter inductor (L3), wherein the source of the first switch tube (Q6) is connected to a first end of a primary winding of the transformer (T) and a second end of the primary winding of the transformer (T) is connected to a front ground via a first resonant capacitor(C4), the drain of the second switch tube (Q7) is connected to the first end of a primary winding of the transformer (T), a first end of a secondary winding of the transformer (T) is connected to a cathode of the first diode (D5), a second end of the secondary winding of the transformer (T) is connected to an anode of the second diode (D6), and the anode of the second diode (D6) is connected to a front end of the filter inductor (L3); and an inversion unit (60). The voltage conversion circuit can increase a PF value and improve the output voltage quality.

Description

基于PFC与LLC谐振的智能半桥修正波电压转换电路Intelligent half-bridge modified 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谐振的智能半桥修正波电压转换电路。The invention relates to a voltage conversion circuit, in particular to an intelligent half bridge correction 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。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.
发明内容Summary of the invention
本发明要解决的技术问题在于，针对现有技术的不足，提供一种可提高电压转换装置的PF值、可提高输出电压质量，并且安全可靠的基于PFC与LLC谐振的智能半桥修正波电压转换电路。The technical problem to be solved by the present invention is to provide an intelligent half-bridge correction wave voltage based on PFC and LLC resonance which can improve the PF value of the voltage conversion device, improve the output voltage quality, and is safe and reliable. Conversion circuit.
为解决上述技术问题，本发明采用如下技术方案。In order to solve the above technical problems, the present invention adopts the following technical solutions.
一种基于PFC与LLC谐振的智能半桥修正波电压转换电路，其包括有：一输入单元，用于提供直流电压；一滤波单元，连接于输入单元的输出端，用于对输入单元的输出电压进行滤波；一PFC升压单元，连接于滤波单元的输出端，用于对滤波单元的输出电压进行升压转换；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谐振电容连接于前端地，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滤波电感的前端，所述滤波电感的后端通过第三电容连接于后端地，所述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，连接于LLC隔离变换器单元的输出端，所述逆变倒相单元用于对LLC隔离变换器单元的输出电压进行逆变转换后输出交流电。An intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance, comprising: an input unit for supplying a DC voltage; and a filtering unit connected to an output end of the input unit for outputting the input unit The voltage is filtered; a PFC boosting unit is connected to the output end of the filtering unit for boosting the output voltage of the filtering unit; and an LLC isolation converter unit includes a first switching tube and a second switching tube. a transformer, a first diode, a second diode and a filter inductor, a drain of the first switch tube is connected to an output end of the PFC boost unit, and a source of the first switch tube is connected to a primary winding of the transformer The first end of the transformer, the second end of the transformer is connected to the front end through a first resonant capacitor, and the drain of the second switch is connected to the first end of the primary winding of the transformer, the second switch The source is connected to the front end through a third resistor, and the gate of the first switch tube and the gate of the second switch tube are used to load two PWM pulse signals of opposite phases to make the first switch tube and The two switch tubes are alternately turned on, the middle tap of the transformer secondary winding is connected to the back end, and the first end of the transformer secondary winding is connected to the cathode of the first diode, the first diode The anode is connected to the rear end through a second capacitor, the second end of the transformer secondary winding is connected to the anode of the second diode, and the cathode of the second diode is connected to the front end of the filter inductor, the filtering The back end of the inductor is connected to the back end through a third capacitor, and the back end of the filter inductor is isolated from the anode of the first diode as an LLC An output end of the converter unit; an inverter inverting unit connected to an output end of the LLC isolating converter unit, wherein the inverter inverting unit is configured to invert and convert the output voltage of the LLC isolated converter unit to output an alternating current .
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。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, and the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, and the input terminals of the safety capacitor and the rectifier bridge are connected in parallel to the rear end of the common mode suppression inductor.
优选地，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 filtering unit comprises a filter capacitor, and the filter capacitor is connected in parallel to the output end 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.
优选地，所述逆变倒相单元包括有第四开关管、第五开关管、第三电解电容和第四 电解电容，所述第四开关管的漏极连接于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和第三电解电容的负极作为逆变倒相单元的输出端。Preferably, the inverter inverter unit includes a fourth switch tube, a fifth switch tube, a third electrolytic capacitor, and a fourth An electrolytic capacitor, a drain of the fourth switch is connected to an anode of an output of the LLC isolating converter unit, a source of the fourth switch is connected to a drain of the fifth switch, and the fifth switch is The source is connected to the negative terminal of the output of the LLC isolating converter unit, and the gate of the fourth switch tube and the gate of the fifth switch tube are respectively used to access two PWM pulse signals of opposite phases, the third electrolysis The anode of the capacitor is connected to the drain of the fourth switch tube, the cathode of the third electrolytic capacitor is connected to the back end, and the cathode of the third electrolytic capacitor is also connected to the anode of the fourth electrolytic capacitor, the fourth electrolytic capacitor The negative pole is connected to the source of the fifth switching transistor, and the source of the fourth switching transistor and the negative electrode of the third electrolytic capacitor serve as the output end of the inverter inverting unit.
本发明公开的基于PFC与LLC谐振的智能半桥修正波电压转换电路中，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、第一谐振电容、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脉动电平，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。In the intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance disclosed by 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 isolating converter unit, the first switching transistor, the second switching transistor, the first resonant 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 first diode and the second diode are rectified into two pulsation levels in opposite directions, and then filtered by the filter inductor, the second capacitor, and the third capacitor into a DC voltage including positive and negative directions, and the transformer is first changed by changing the transformer. The ratio of the turns of the stage 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.
附图说明DRAWINGS
图1为本发明全桥修正波电压转换电路的原理图。1 is a schematic diagram of a full bridge modified wave 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谐振的智能半桥修正波电压转换电路，结合图1至图3所示，其包括有：The invention discloses an intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance, which is combined with FIG. 1 to FIG. 3 and includes:
一输入单元10，用于提供直流电压；An input unit 10 for providing a DC voltage;
一滤波单元20，连接于输入单元10的输出端，用于对输入单元10的输出电压进行滤波；a filtering unit 20 is connected to the output end of the input unit 10 for filtering the output voltage of the input unit 10;
一PFC升压单元30，连接于滤波单元20的输出端，用于对滤波单元20的输出电压进行升压转换；a PFC boosting unit 30 is connected to the output end of the filtering unit 20 for performing boost conversion on the output voltage of the filtering unit 20;
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谐振电容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的阴极连接于滤波电感L3的前端，所述滤波电感L3的后端通过第三电容C8连接于后端地，所述滤波电感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, and a first diode The diode D5, the second diode D6 and the filter inductor L3, the drain of the first switch transistor Q6 is connected to the output end of the PFC boost unit 30, and the source of the first switch transistor Q6 is connected to the transformer T1 primary a first end of the winding, a second end of the primary winding of the transformer T1 is connected to the front end through a first resonant capacitor C4, and a drain of the second switching transistor Q7 is connected to a first end of the primary winding of the transformer T1, The source of the second switching transistor Q7 is connected to the front end through a third resistor R2B, and the gate of the first switching transistor Q6 and the gate of the second switching transistor Q7 are used to load two PWM pulses with opposite phases to The first switch tube Q6 and the second switch tube Q7 are alternately turned on, the middle tap of the secondary winding of the transformer T1 is connected to the back end, and the first end of the secondary winding of the transformer T1 is connected to the first two a cathode of the diode D5, an anode of the first diode D5 is connected to a rear end through a second capacitor C7, and a second end of the secondary winding of the transformer T1 is connected to an anode of the second diode D6. The cathode of the second diode D6 is connected to the front end of the filter inductor L3, and the filter inductor L3 The back end is connected to the back end through a third capacitor C8, and the back end of the filter inductor L3 and the anode of the first diode D5 serve as an output end of the LLC isolation converter unit 40;
一逆变倒相单元60，连接于LLC隔离变换器单元40的输出端，所述逆变倒相单元60用于对LLC隔离变换器单元40的输出电压进行逆变转换后输出交流电。An inverter inverting unit 60 is connected to the output end of the LLC isolating converter unit 40, and the inverter inverting unit 60 is configured to invert and convert the output voltage of the LLC isolating converter unit 40 to output an alternating current.
上述修正波电压转换电路中，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、第一谐振电容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脉动电平，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。In the above correction wave voltage conversion circuit, the DC voltage supplied from the input unit 10 is filtered by the filtering unit 20, subjected to boost conversion by the PFC boosting unit 30, and then transmitted to the LLC isolating converter unit 40, in the LLC isolating converter unit 40. The first switching transistor Q6, the second switching transistor Q7, the first resonant 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 first The diode D5 and the second diode D6 are rectified into two pulsation 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 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.
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。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.
为了对输入电压进行滤波，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。In order to filter the input voltage, the filtering unit 20 includes a filtering capacitor C1, which is connected in parallel to the output 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. Output, The back 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 to access one PWM. a control signal, 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 serves as an output end of the PFC boosting unit 30, and a cathode of the first rectifier diode D1 The positive electrode of the second electrolytic capacitor C2 is connected, and the negative electrode 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。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.
为了便于监测交流侧的电信号，请参照图2，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 the monitoring of the electrical signal on the AC side, please refer to FIG. 2 , which further includes an AC sampling unit 70 connected between the input end of the input unit 10 and the MCU control unit 80. The AC sampling unit 70 It is used to collect the voltage of 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，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 manner, in order to collect the DC side electrical signal, the embodiment further includes a DC voltage sampling unit 50, and the DC voltage sampling unit 50 includes a second sampling resistor R13 and a third sampling resistor connected in series. R15, a front end of the second sampling resistor R13 is connected to an output end of the LLC isolation converter unit 40, and a rear end of the third sampling resistor R15 is connected to the MCU control unit 80, by the second sampling resistor R13 and The third sampling resistor R15 causes the MCU control unit 80 to acquire an electrical signal output by the LLC isolated converter unit 40.
关于逆变部分，请参照图1，所述逆变倒相单元60包括有第四开关管Q2、第五开关管Q4、第三电解电容C3和第四电解电容C5，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的源极和第三电解电容C3的负极作为逆变倒相单元60的输出端。Referring to FIG. 1 , the inverter inverter unit 60 includes a fourth switch tube Q2 , a fifth switch tube Q4 , a third electrolytic capacitor C3 , and a fourth electrolytic capacitor C5 , and the fourth switch tube The drain of Q2 is 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 output terminal of the LLC isolating converter 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 pulses of opposite phase, the third electrolytic capacitor The anode of C3 is connected to the drain of the fourth switch transistor Q2, the cathode of the third electrolytic capacitor C3 is connected to the rear end, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5. The cathode of the fourth electrolytic capacitor C5 is connected to the source of the fifth switching transistor Q4, and the source of the fourth switching transistor Q2 and the cathode of the third electrolytic capacitor C3 serve as the output terminal of the inverter inverting unit 60.
进一步地，所述第四开关管Q2的栅极和源极之间连接有第一电阻R17，所述第五开关管Q4的栅极和源极之间连接有第二电阻R23。Further, a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a second resistor R23 is connected between the gate and the source of the fifth switching transistor Q4.
上述逆变倒相单元60中，经过滤波电感L3滤波电感滤成直流电压经第四开关管Q2、负载、第四电解电容C4形成回路给负载供电形成第一个半周期修正波电平；第二个半周期修正波电平通过第五开关管Q4、负载、第三电解电容C3形成回路，这样在负载上就形成了一个完整的工频修正波交流电压。控制芯片输出的PWM信号经驱动电路后分别送出PWM2H、PWM2L给第四开关管Q2、第五开关管Q4的GATE极。逆变倒相电路中的相位与频率按照控制芯片内部设定的模式进行工作。同时第三电解电容C3、第四电解电容C4还有滤波的作用，可以与滤波电感L3组成滤波电路。本逆变电路控制简单，电路只用两个MOS管，成本低廉。In the inverter inverter unit 60, the filter inductor L3 filters the inductor into a DC voltage, and the fourth switch tube Q2, the load, and the fourth electrolytic capacitor C4 form a loop to supply power to the load to form a first half-cycle correction wave level; The two half-cycle correction wave levels form a loop through the fifth switching transistor Q4, the load, and the third electrolytic capacitor C3, so that a complete power frequency correction wave AC voltage is formed on the load. After the PWM signal outputted by the control chip passes through the driving circuit, PWM2H and PWM2L are respectively sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4. The phase and frequency in the inverter inverter circuit operate in accordance with the mode set in the control chip. At the same time, the third electrolytic capacitor C3 and the fourth electrolytic capacitor C4 also have a filtering function, and can form a filtering circuit with the filter inductor L3. The inverter circuit is simple to control, and the circuit uses only two MOS tubes, and the cost is low.
本发明公开的基于PFC与LLC谐振的智能半桥修正波电压转换电路，其具有高PF值，可实现电网与输出端隔离，且安全性非常高。在输入全电压范围内能够能自动调节输出电压，可固定输出频率，并且输出电压是以修正波输出，对交流电压有自动整形功能，此外，本发明电路简单，控制方便，并且含有电压与电流采样电路，能防浪涌电压与电流。The intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance disclosed in the invention has a high PF value, can realize isolation between the power grid and the output end, and has high security. The output voltage can be automatically adjusted within the input full voltage range, the output frequency can be fixed, and the output voltage is a modified wave output, which has an automatic shaping function for the AC voltage. In addition, the circuit of the invention is simple, convenient to control, and contains voltage and current. Sampling circuit to prevent surge voltage and current.
以上所述只是本发明较佳的实施例，并不用于限制本发明，凡在本发明的技术范围内所做的修改、等同替换或者改进等，均应包含在本发明所保护的范围内。 The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalents, and improvements made within the technical scope of the present invention are intended to be included within the scope of the present invention.

Claims (10)

  1. 一种基于PFC与LLC谐振的智能半桥修正波电压转换电路，其特征在于，包括有：An intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance, characterized in that it comprises:
    一输入单元(10)，用于提供直流电压；An input unit (10) for providing a DC voltage;
    一滤波单元(20)，连接于输入单元(10)的输出端，用于对输入单元(10)的输出电压进行滤波；a filtering unit (20) connected to the output end of the input unit (10) for filtering the output voltage of the input unit (10);
    一PFC升压单元(30)，连接于滤波单元(20)的输出端，用于对滤波单元(20)的输出电压进行升压转换；a PFC boosting unit (30) is connected to the output end of the filtering unit (20) for boosting the output voltage of the filtering unit (20);
    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谐振电容(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)的阴极连接于滤波电感(L3)的前端，所述滤波电感(L3)的后端通过第三电容(C8)连接于后端地，所述滤波电感(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 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 the 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 resonant capacitor (C4), and a drain of the second switching transistor (Q7) is connected to the transformer (T1) a first end of the primary winding, a source of the second switching transistor (Q7) is connected to the front end through a third resistor (R2B), a gate of the first switching transistor (Q6) and a second switching transistor (Q7) The gate is used to load two opposite phase PWM pulse signals to alternately conduct the first switching transistor (Q6) and the second switching transistor (Q7) in the middle of the secondary winding of the transformer (T1) The 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) passes 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 filter inductor (L3), the filter inductor The rear end of (L3) is connected to the rear end through a third capacitor (C8), and the rear end of the filter inductor (L3) and the anode of the first diode (D5) function as an LLC isolated converter unit (40) Output
    一逆变倒相单元(60)，连接于LLC隔离变换器单元(40)的输出端，所述逆变倒相单元(60)用于对LLC隔离变换器单元(40)的输出电压进行逆变转换后输出交流电。An inverter inverting unit (60) is connected to an output of the LLC isolating converter unit (40) for inverting an output voltage of the LLC isolated converter unit (40) After the conversion, the output AC power.
  2. 如权利要求1所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，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。The intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance according to claim 1, wherein the input unit (10) comprises a socket, an insurance (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). rear end.
  3. 如权利要求2所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，其特征在于，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 modified wave voltage conversion circuit based on PFC and LLC resonance according to claim 2, wherein the filtering unit (20) comprises a filter capacitor (C1), and the filter capacitor (C1) is connected in parallel The output of the rectifier bridge (DB1).
  4. 如权利要求1所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，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 modified wave 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谐振的智能半桥修正波电压转换电路，其特征在于，还包括有一MCU控制单元(80)，所述第一开关管(Q6)的栅极、第二开关管(Q7)的栅极和第三开关管(Q5)的栅极分别连接于MCU控制单元(80)，所述MCU控制单元(80)用于分别输出PWM信号至第一开关管(Q6)、第二开关管(Q7)和第三开关管(Q5)，以控制第一开关管(Q6)、第二开关管(Q7)和第三开关管(Q5)通断状态。The intelligent half-bridge modified wave 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谐振的智能半桥修正波电压转换电路，其特征在于，还包括有一交流采样单元(70)，所述交流采样单元(70)连接于输入单元(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 correction wave 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5所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，其特征在于，所述第三开关管(Q5)的源极与前端地之间连接有第一采样电阻(R2A)，所述第三开关管(Q5)的源极连接于MCU控制单元(80)，藉由所述第一采样电阻(R2A)而令MCU控制单元(80)采集第三开关管(Q5)源极的电信号。The intelligent half-bridge correction wave 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 source of the third switch tube (Q5) is connected to the MCU control unit (80), and the MCU control unit (80) acquires the third switch tube (Q5) by the first sampling resistor (R2A) ) The electrical signal of the source.
  8. 如权利要求5所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，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 modified wave 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).
  9. 如权利要求5所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，其特征在于，还包括有一DC电压采样单元(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 correction wave 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 series 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.
  10. 如权利要求5所述的基于PFC与LLC谐振的智能半桥修正波电压转换电路，其特征在于，所述逆变倒相单元(60)包括有第四开关管(Q2)、第五开关管(Q4)、第三电解电容(C3)和第四电解电容(C5)，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)的源极和第三电解电容(C3)的负极作为逆变倒相单元(60)的输出端。 The intelligent half-bridge modified wave voltage conversion circuit based on PFC and LLC resonance according to claim 5, wherein the inverter inverting unit (60) comprises a fourth switching tube (Q2) and a fifth switching tube. (Q4), a third electrolytic capacitor (C3) and a fourth electrolytic capacitor (C5), the drain of the fourth switching transistor (Q2) is connected to the positive terminal of the output of the LLC isolating converter unit (40), the first The source of the four 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 negative terminal of the output of the LLC isolation converter unit (40). The gates 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 electrode of the third electrolytic capacitor (C3) is connected to the first a drain of the fourth switch transistor (Q2), a cathode of the third electrolytic capacitor (C3) is connected to the rear end, and a cathode of the third electrolytic capacitor (C3) is also connected to the anode of the fourth electrolytic capacitor (C5). The cathode of the fourth electrolytic capacitor (C5) is connected to the source of the fifth switching transistor (Q4), and the source of the fourth switching transistor (Q2) and the cathode of the third electrolytic capacitor (C3) are inverted as inverters. phase (60) The output terminal element.
PCT/CN2017/080984 2017-01-04 2017-04-19 Intelligent half-bridge correction wave voltage conversion circuit based on pfc and llc resonances WO2018126556A1 (en)

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CN113507216A (en) * 2021-06-25 2021-10-15 科陆国际技术有限公司 Isolation circuit, switching power supply and electronic equipment
CN116526428A (en) * 2023-07-04 2023-08-01 广东东菱电源科技有限公司 BUCK fast switch-on and switch-off protection circuit

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