WO2018126556A1 - Circuit de conversion de tension d'ondes de correction de demi-ponts intelligents sur la base de résonances pfc et llc - Google Patents

Circuit de conversion de tension d'ondes de correction de demi-ponts intelligents sur la base de résonances pfc et llc 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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English (en)
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/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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.

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

Abstract

L'invention concerne un circuit de conversion de tension d'ondes de correction de demi-ponts intelligents sur la base de résonances PFC et LLC. Le circuit comprend : une unité d'entrée (10); une unité de filtrage (20); une unité élévatrice de tension PFC (30); une unité de convertisseur isolé LLC (40) comprenant un premier tube commutateur (Q6), un deuxième tube commutateur (Q7), un transformateur (T), une première diode (D5), une deuxième diode (D6) et une inductance de filtre (L3), la source du premier tube commutateur (Q6) étant connectée à une première extrémité d'un enroulement primaire du transformateur (T) et une deuxième extrémité de l'enroulement primaire du transformateur (T) étant connectée à une première masse par le biais d'un premier condensateur résonant (C4), le drain du deuxième tube commutateur (Q7) étant connecté à la première extrémité d'un enroulement primaire du transformateur (T), une première extrémité d'un enroulement secondaire du transformateur (T) étant connectée à une cathode de la première diode (D5), une deuxième extrémité de l'enroulement secondaire du transformateur (T) étant connectée à une anode de la deuxième diode (D6), et l'anode de la deuxième diode (D6) étant connectée à une extrémité avant de l'inductance de filtre (L3); et une unité d'inversion (60). Le circuit de conversion de tension peut accroître une valeur PF et améliorer la qualité de la tension de sortie.
PCT/CN2017/080984 2017-01-04 2017-04-19 Circuit de conversion de tension d'ondes de correction de demi-ponts intelligents sur la base de résonances pfc et llc WO2018126556A1 (fr)

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CN201710003732.XA CN106787780A (zh) 2017-01-04 2017-01-04 基于pfc与llc谐振的智能半桥修正波电压转换电路
CN201710003732.X 2017-01-04

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CN106849690A (zh) * 2017-01-04 2017-06-13 广东百事泰电子商务股份有限公司 基于pfc与llc谐振的智能半桥正弦波电压转换电路
CN113507216A (zh) * 2021-06-25 2021-10-15 科陆国际技术有限公司 隔离电路、开关电源及电子设备
CN116526428A (zh) * 2023-07-04 2023-08-01 广东东菱电源科技有限公司 一种buck快速开关机保护电路

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