CN106787793A - PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit - Google Patents

PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit Download PDF

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CN106787793A
CN106787793A CN201611160692.1A CN201611160692A CN106787793A CN 106787793 A CN106787793 A CN 106787793A CN 201611160692 A CN201611160692 A CN 201611160692A CN 106787793 A CN106787793 A CN 106787793A
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connected
unit
switch
pfc
output
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CN201611160692.1A
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廖志刚
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广东百事泰电子商务股份有限公司
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Publication of CN106787793A publication Critical patent/CN106787793A/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4241Arrangements for improving power factor of AC input using a resonant converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion
    • Y02B70/12Power factor correction technologies for power supplies
    • Y02B70/126Active technologies

Abstract

The invention discloses a PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit, which comprises an input rectifier unit, a filter unit, a PFC booster unit and an LLC isolating converter unit, wherein the LLC isolating converter unit comprises a first switch tube, a second switch tube, a first fly-wheel diode, a second fly-wheel diode, a transformer, a resonant capacitor and a discharge resistor; a drain of the first switch tube is connected to an output end of the PFC booster unit; a source of the first switch tube is connected to a first end of the transformer; a second end of the transformer is connected with front-end ground through the resonant capacitor; the drain of the second switch tube is connected to the source of the first switch tube; the source of the second switch tube is connected with the front-end ground through the discharge resistor; and a center tap of a secondary winding of the transformer is taken as the output end of the LLC isolating converter unit. According to the PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit, the PF value of a voltage conversion device can be improved, the quality of output voltage can be improved and a safe and reliable effect can be achieved.

Description

基于PFG与LLG谐振的智能全桥修正波电压转换电路 LLG-based intelligent PFG and full-bridge resonant converter circuit voltage correction wave

技术领域 FIELD

[0001]本发明涉及电压转换电路,尤其涉及一种基于PFC与LLC谐振的智能全桥修正波电压转换电路。 [0001] The present invention relates to a voltage conversion circuit, and particularly to a PFC-based full-bridge LLC resonant intelligent correction wave voltage conversion circuit.

背景技术 Background technique

[0002]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,PFC、 LLC和全桥修正波电压转换电路拓扑是其关键电路,是一种能实现…—从^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。 [0002] In the prior art, intelligent down converter means by an AC to AC is also known as travel inserted row, the apparatus, PFC, LLC, and the correction wave voltage converter full bridge circuit topology is the key circuit, a species can be realized ... - ^ conversion from circuit may be implemented in a step-down AC-AC conversion and stabilization of voltage and frequency. 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。 However, the current AC-AC devices will Jun market, most of the non-isolated topologies circuit, and a low PF value, the output voltage is low quality, security and reliability difference.

发明内容 SUMMARY

[0003]本发明要解决的技术问题在于,针对现有技术的不足,提供一种基于PFC与LLC谐振的智能全桥修正波电压转换电路,用以提高电压转换装置的PF值、提高输出电压质量,以及取得安全可靠等效果。 [0003] The present invention is to solve the technical problem for the deficiencies of the prior art, there is provided a PFC and LLC resonant based intelligent correction wave voltage converter full bridge circuit, to increase the PF value of the voltage conversion device, increasing the output voltage quality, and access to safe and reliable results.

[0004]为解决上述技术问题,本发明采用如下技术方案。 [0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] —种基于PFC与LLC谐振的智能全桥修正波电压转换电路,其包括有:一输入整流单元,其输入端连接电网,用于对电网电压进行整流;一滤波单元,连接于输入整流单元的输出纟而,用于对输入整流单兀输出的电压进行滤波;一PFC升压单元,连接于滤波单元的输出端,用于对滤波单元输出的电压进行升压转换;一LLC隔离变换器单元,包括有第一开关管、第二开关管、第一续流二极管、第二续流二极管、变压器、谐振电容和放电电阻,所述第一开关管的漏极连接于PFC升压单元的输出端,所述第一开关管的源极连接于变压器的第一端,所述变压器的第二端通过谐振电容连接前端地,所述第二开关管的漏极连接于第一开关管的源极,所述第二开关管的源极通过放电电阻连接前端地,所述第一开关管的栅极和第二开关管的栅极用于加载两路相位相反的PWM脉冲 [0005] - the kind of PFC-based full-bridge LLC resonant intelligent correction wave voltage conversion circuit comprising: an input rectifier unit, an input terminal connected to the grid, a grid voltage is rectified; a filter unit connected to the input Si and rectified output unit, for filtering the rectified voltage input single-output Wu; a PFC boost unit connected to the output terminal of the filtering means, means for filtering the voltage output by the boost converter; an isolation LLC converter means comprises a first switch, a second switch, a first freewheeling diode, the second freewheeling diode, a transformer, a resonant capacitor and a discharge resistor, the drain of the first switching transistor is connected to a PFC boost output of the unit, the source of the first switching transistor is connected to the first end of the transformer, said transformer resonant capacitor through a second end connected to the distal end, the drain of the second switching transistor is connected to the first switch source tube, a source of the second switching transistor is connected to the front end by the discharge resistor, the gate of the first switch and a second switch for loading two opposite phase PWM pulse 信号,以令所述第一开关管和第二开关管交替导通,所述变压器副边绕组的第一端连接于第一续流二极管的阳极,所述变压器副边绕组的第二端连接于第二续流二极管的阳极,所述第一续流二极管的阴极和第二续流二极管的阴极均连接后端地,所述变压器副边绕组的中间抽头作为LLC隔离变换器单元的输出端;一DC电压滤波单元,包括有第一电解电容,所述第一电解电容的正极连接于LLC 隔离变换器单元的输出端,所述第一电解电容的负极连接后端地;一逆变倒相单元,连接于LLC隔离变换器单元的输出端,所述逆变倒相单元用于对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。 Signal that causes the first switch and the second switch alternately conducting, the secondary winding of the transformer is connected to the anode of the first end of a first freewheeling diode connected to the second end of the secondary winding of the transformer the second to the anode of the freewheeling diode, the cathode of the first freewheel diode and a cathode of the second freewheel diode is connected to the rear end, the intermediate tap of the transformer secondary winding of the isolation transformer output terminals as the LLC unit ; a DC voltage filtering means comprises a first electrolytic capacitor, the first anode is connected to the electrolytic capacitor is isolated LLC converter unit output terminal, the first negative electrolytic capacitor connected to a rear end; a reverse inverter phase unit cells, the isolation LLC converter unit is connected to the output terminal of the inverter unit for inverting isolation LLC converter unit output voltage of the inverter output AC after the conversion.

[0006]优选地,所述第一开关管的栅极与源极之间连接有第一下拉电阻。 [0006] Preferably, the first pull-down resistor connected between the gate of the first switch transistor and the source. t0007]优选地,所述第二开关管的栅极与源极之间连接有第二下拉电阻。 t0007] Preferably, a second pull-down resistor is connected between the gate of the second switching transistor and the source.

[0008] 优选地,所述滤波单元包括有滤波电容,所述滤波电容连接于输入整流单元的输出端与前端地之间。 [0008] Preferably, the filter unit comprises a filter capacitor, said filter capacitor connected between the input and the output of the rectifying unit to the front end.

[0009] 优选地,所述PFC升压单元包括有升压电感、第三开关管、第一整流二极管和第二电解电容,所述升压电感的前端连接于滤波单元的输出端,所述升压电感的后端连接于弟三开关管的漏极,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。 [0009] Preferably, the unit comprises a boost PFC boost inductor, a third switch, a first and a second rectifier diode electrolytic capacitor, the boost output terminal connected to the front end of the filter inductance means, said the drain is connected to the rear end of the boost inductor brother third switching tube, the source of the third switching transistor is connected to the front end, the gate of the third switching transistor for accessing a PWM control signal, the second the anode is connected to the drain of the first switch three rectifier diode, the cathode of the first rectifier diode as an output of the PFC boost cell, a positive electrode and a cathode of the first rectifier diode connected to the second electrolytic capacitor, a second electrolytic the front end of the capacitor connected to the negative electrode.

[0010] 优选地,所述第三开关管的栅极与前端地之间连接有第三下拉电阻。 [0010] Preferably, the third pull-down resistor is connected between the gate of the third switch and the front end.

[0011] 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M⑶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〇 [0011] Preferably, further comprising a control unit MCU, the gate of the first switch transistor, the gates of the second and third switch transistor switch M⑶ are connected to the control unit, the control unit MCU respectively, for outputting a PWM signal to the first switch, the second switch and the third switch, to control the first switch, the second switch and the third switch-off square shape

[0012] 优选地,还包括有一交流采样单元,所述交流采样单元连接于输入整流单元的输入端与M⑶控制单元之间,所述交流采样单元用于采集输入整流单元交流侧的电压并反馈至MCU控制单元。 [0012] Preferably, the AC further comprising a sampling unit, the sampling unit is connected between the AC input and the input terminal of the rectifying unit M⑶ control means, means for sampling the AC input rectified AC voltage side and the feedback acquisition unit to the control unit MCU.

[0013] 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。 [0013] Preferably, the connection between the source of the third switch and the front end of the first sampling resistor, the source of the third switching transistor is connected to a control unit MCU, by the first sampling resistor so the control unit MCU and to acquire the third switch electrical source.

[0014] 优选地,还包括有一DC电压米样单兀,所述DC电压采样单元包括有依次串联的第二采样电阻和第三采样电阻,所述第二采样电阻的前端连接于LLC隔离变换器单元的输出端,所述第三采样电阻的后端连接于MCU控制单元,藉由所述第二采样电阻和第三采样电阻而令MCU控制单元采集LLC隔离变换器单元输出端的电信号。 [0014] Preferably, further comprising a DC voltage meter Wu single sample, the DC voltage sampling unit comprises a sampling resistor in series a second resistor and a third sampling, the sampling end of the second resistor connected to the insulating converter LLC the output of the unit, the rear end of the third resistor is connected to the sampling control unit MCU, by sampling the second resistor and the third resistor and the sample collection control unit MCU make electrical isolation LLC converter unit output.

[0015] 本发明公开的基于PFC与LLC谐振的智能全桥修正波电压转换电路中,利用输入整流单元对电网电压进行整流后,再经过滤波单元滤波而输出脉动直流电压,之后利用PFC升压单元对脉动直流电压进行升压处理,在LLC隔离变换器单元中,第一开关管、第二开关管、 谐振电容、放电电阻与变压器原边的漏感及原边励磁电感组成LLC谐振电路,并在LLC谐振电路的状态转换过程中将电能传输至变压器的副边线圈,通过第一续流二极管和第二续流二极管整流成单向脉动电平,通过改变变压器原副边绕组的匝数比,可以调整输出电压的高低,进而实现升压或者降压转换。 [0015] The present invention is based on the disclosure PFC and LLC resonant full bridge intelligent correction wave voltage converting circuit, the grid voltage is rectified by the input rectifying means, and then after filtering in filter unit to output the pulsating DC voltage, after which PFC boost means for pulsating DC voltage boosting processing, the LLC converter unit in isolation, a first switch, a second switch, a resonant capacitor, a discharge resistor with the transformer primary leakage inductance and magnetizing inductance of the primary composition LLC resonant circuit, LLC resonant circuit and the state of power transmission to the conversion process in the secondary winding of the transformer, the first and the second freewheeling diode into a unidirectional freewheeling diode rectification ripple level, by changing the secondary winding of the transformer primary turns ratio, the output voltage level can be adjusted, so as to realize the boost or buck converter. 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。 Based on the above configuration, the present invention not only provides isolation of voltage transmission, thereby increasing the boost / PF value of the buck converter means, further improves the quality of the output voltage, so that the voltage conversion process more secure.

附图说明 BRIEF DESCRIPTION

[0016]图1为本发明全桥修正波电压转换电路的原理图。 [0016] FIG 1 Schematic correction wave voltage full bridge conversion circuit of the present invention.

[0017]图2为本发明优选实施例中交流采样单元的电路原理图。 [0017] FIG. 2 is preferred embodiment the AC circuit diagram of a sampling unit embodiment of the present invention.

[0018]图3为本发明优选实施例中MCU控制单元的电路原理图。 [0018] Fig 3 a schematic circuit diagram of the control unit MCU embodiment preferred embodiment of the present invention.

具体实施方式 Detailed ways

[0019]下面结合附图和实施例对本发明作更加详细的描述。 Drawings and embodiments of the present invention will be described in more detail [0019] below in conjunction.

[0020]本发明公开了一种基于PFC与LLC谐振的智能全桥修正波电压转换电路结八网] 至图3所示,其包括有: < H [0020] The present invention discloses a PFC converter circuit node based on the full bridge LLC resonant intelligent network eight correction wave voltage] As shown in FIGS. 3, which comprises: <H

[0021] —输入整流单元10,其输入端连接电网,用于对电网电压进行整流; [0021] - input rectifier unit 10, an input terminal connected to the grid, the grid for rectifying a voltage;

[0022] 一滤波单元20,连接于输入整流单元10的输出端,用于对输入整流单元10输出的电压进行滤波; [0022] a filter unit 20, the input connected to the output of the rectifying unit 10, for filtering the rectified output voltage input unit 10;

[0023] 一PFC升压单元3〇,连接于滤波单元2〇的输出端,用于对滤波单元20输出的电压进行升压转换; [0023] 3〇 a PFC boost unit, connected to the output 2〇 filtering unit for filtering the voltage unit 20 outputs a boost converter;

[0024] 一LLC隔离变换器单元40,包括有第一开关管Q6、第二开关管Q7、第一续流二极管D6、第二续流二极管D5、变压器T1、谐振电容C4和放电电阻R2B,所述第一开关管Q6的漏极连接于PFC升压单元30的输出端,所述第一开关管Q6的源极连接于变压器T1的第一端,所述变压器T1的第二端通过谐振电容C4连接前端地,所述第二开关管Q7的漏极连接于第一开关管Q6的源极,所述第二开关管Q7的源极通过放电电阻R2B连接前端地,所述第一开关管Q6的栅极和第二开关管Q7的栅极用于加载两路相位相反的PWM脉冲信号,以令所述第一开关管Q6 和第二开关管Q7交替导通,所述变压器T1副边绕组的第一端连接于第一续流二极管D6的阳极,所述变压器T1副边绕组的第二端连接于第二续流二极管D5的阳极,所述第一续流二极管D6的阴极和第二续流二极管D5的阴极均连接后端地,所述变压器T1副 [0024] isolated a LLC converter unit 40, comprising a first switch transistor Q6 are, the second switching transistor Q7, a first freewheel diode D6, the second freewheeling diode D5, a transformer T1, a resonant capacitor C4 and R2B, the discharge resistor, drain of the first switching transistor Q6 is connected to the output of the PFC boost unit 30, the source of the first switch transistor Q6 is connected to the first end of the transformer T1, the second end of the transformer T1 through a resonance capacitor C4 is connected to the front end, a drain of the second switching transistor Q7 is connected to the source electrode of the first switching transistor Q6, the source of the second switching transistor Q7 is connected through a discharge resistor R2B front end, said first switch the gate of transistor Q6 and Q7, a second switch for loading a PWM pulse signal opposite phase two, in order to make the first switch and the second switch transistor Q6 Q7 are alternately turned on, the sub transformer T1 winding a first end connected to the anode of the first freewheel diode D6, the anode, Tl secondary winding of the transformer is connected to a second end of the second free wheeling diode D5 and the cathode of the first freewheel diode D6 and cathode of the second freewheel diode D5 are connected to the rear end of the transformer T1 sub 绕组的中间抽头作为LLC隔离变换器单元40的输出端; Intermediate tap winding as an output unit 40 of the LLC converter isolation;

[0025] — DC电压滤波单元50,包括有第一电解电容C3,所述第一电解电容C3的正极连接于LLC隔离变换器单元40的输出端,所述第一电解电容C3的负极连接后端地; [0025] - DC voltage filtering means 50, a first positive electrode comprising electrolytic capacitor C3, the first electrolytic capacitor C3 is connected to the output unit 40 of the LLC converter isolation, the electrolytic capacitor C3 is first connected to the negative the end;

[0026] —逆变倒相单元70,连接于LLC隔离变换器单元40的输出端,所述逆变倒相单元70 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。 [0026] - reverse phase inverter unit 70 is connected to the output of converter unit LLC spacer 40, the inverted output of the inverter unit 70 for phase AC output voltage isolation LLC converter unit 40 is converted inverter .

[0027]上述全桥修正波电压转换电路中,利用输入整流单元1〇对电网电压进行整流后, 再经过滤波单元20滤波而输出脉动直流电压,之后利用PFC升压单元30对脉动直流电压进行升压处理,在LLC隔离变换器单元40中,第一开关管Q6、第二开关管Q7、谐振电容C4、放电电阻R2B与变压器T1原边的漏感及原边励磁电感组成LLC谐振电路,并在LLC谐振电路的状态转换过程中将电能传输至变压器T1的副边线圈,通过第一续流二极管D6和第二续流二极管D5整流成单向脉动电平,通过改变变压器T1原副边绕组的匝数比,可以调整输出电压的高低,进而实现升压或者降压转换。 [0027] The full bridge correction wave voltage converting circuit, the grid voltage is rectified 1〇 using the input rectifier means, filtering means and then through filter 20 to output the pulsating DC voltage, after which PFC boost unit 30, DC voltage ripple boosting processing, the isolation transformer in the LLC unit 40, a first switch transistor Q6 are, the second switching transistor Q7, the resonant capacitor C4, a discharging resistor R2B primary side of the transformer T1 primary leakage inductance and magnetizing inductances LLC resonant circuit, and in the power state transition during the transmission of LLC resonant circuit to the secondary coil of the transformer T1 through the first freewheeling diode D6 and the second freewheeling diode D5 rectifies a unidirectional ripple level, by changing the secondary side of the transformer T1 primary winding turns ratio, the output voltage level can be adjusted, so as to realize the boost or buck converter. 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。 Based on the above configuration, the present invention not only provides isolation of voltage transmission, thereby increasing the boost / PF value of the buck converter means, further improves the quality of the output voltage, so that the voltage conversion process more secure.

[0028] 本实施例中,为了提高第一开关管Q6和第二开关管Q7开关速度,所述第一开关管Q6的栅极与源极之间连接有第一下拉电阻R25。 [0028] In the present embodiment, in order to improve the first switch and the second switch transistor Q6 Q7 switching speed, the first switch having a first pull-down resistor R25 between the gate and source of Q6 is connected. 所述第二开关管Q7的栅极与源极之间连接有第二下拉电阻R26。 The gate and source of the second switching transistor Q7 is connected between the second pull-down resistor R26.

[0029]作为一种优选方式,所述滤波单元20包括有滤波电容C1,所述滤波电容C1连接于输入整流单元10的输出端与前端地之间。 [0029] As a preferred embodiment, the filter unit 20 comprises a filtering capacitor C1, the filtering capacitor C1 is connected between the output terminal and the input front end 10 of the rectifying unit.

[0030] 进一步地,所述PFC升压单元30包括有升压电感L2、第三开关管Q5、第一整流二极管D1和第二电解电容C2,所述升压电感L2的前端连接于滤波单元20的输出端,所述升压电感L2的后端连接于第三开关管Q5的漏极,所述第三开关管Q5的源极接前端地,所述第三开关管Q5的栅极用于接入一路PWM控制信号,所述第三开关管Q5的漏极连接第一整流二极管D1的阳极,所述第一整流二极管D1的阴极作为PFC升压单元30的输出端,且该第一整流二极管D1的阴极连接第二电解电容C2的正极,第二电解电容C2的负极接前端地。 [0030] Further, the PFC boost unit 30 includes a boost inductor L2, the third switching transistor Q5, a first rectifier diode D1 and a second electrolytic capacitor C2, a boost inductor L2 is connected to the front end of the filtering means an output terminal 20, the rear end of the boost inductor L2 is connected to the drain of the third switching transistor Q5, a source of the third switching transistor Q5 is connected to the distal end, the third switching gate of Q5 is used access control to a PWM signal, the third switching transistor connected to the drain of the first anode of the rectifying diode D1 Q5, and the cathode of the first rectifier diode D1 as the output of the PFC boost unit 30, and the first a second cathode connected to the positive electrode of the electrolytic capacitor C2 of the rectifying diode D1, an anode connected to the front end of the second electrolytic capacitor C2.

[0031]上述PFC升压单元30中,当监测到Cl输出半波交流电压时,PFC进入升压模式,以提高AC转AC智能降压转换拓扑电路的PF值,升压后通过C2滤波后的电压为400V。 After [0031] The PFC boost unit 30, when detecting the output of the half wave AC voltage Cl, enters PFC boost mode, to increase the PF value of the AC to AC smart buck converter topology circuit, boosted by filtering C2 the voltage of 400V. 具体的升压原理如下:Q5导通时,C1上的电流经升压电感L2、Q5到GND形成回路,升压电感L2储存能量; 当Q5关断时,升压电感上会形成比输入电压高得多的感应电动势,感应电动势经续流管D1 进行整流后形成单向脉冲电压再送给C2电容进滤波,滤波成400V的直流电压。 Specific boosting works as follows: When Q5 is turned on, the current through the boost inductor L2 a C1, Q5 form a circuit to GND, the boost inductor L2 stores energy; when Q5 is turned off, the boost inductor formed on the ratio of the input voltage much higher induced electromotive force, induced electromotive force through the freewheeling diode D1 to form a unidirectional pulsed voltage rectifying capacitor C2 and then sent into the filter, the filter into a DC voltage of 400V. 其中Q5是根据MCU控制单元80采到的输入交流正弦波变化来加大或减少Q5的导通时间,使得电流与电压相位达到一致来提高PF值。 Wherein Q5 is turned to increase or reduce the time of Q5 changes according to the input AC sine wave MCU taken to the control unit 80, so that the current and voltage phase becomes uniform to increase the PF value.

[0032]本实施例中,为了提高第三开关管Q5的开关速度,所述第三开关管Q5的栅极与前端地之间连接有第三下拉电阻R22。 [0032] In the present embodiment, in order to improve the switching speed of the third switching transistor Q5, the third pull-down resistor R22 is connected between the gate and the front end of the third switching transistor Q5.

[0033] 作为一种优选方式,本实施例还包括有一MCU控制单元8〇,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8〇,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。 [0033] As a preferred embodiment, the present embodiment further comprises a control unit MCU 8〇 a gate of said first switching transistor Q6, the gate of the second switching transistor Q7 and Q5, respectively, the third switch tube 8〇 connected to the control unit MCU, the MCU control unit 80 outputs a PWM signal to the switch Q6 are a first, a second and a third switching transistor Q7 switch Q5, Q6 are to control the first switch, a second switch a third switching transistor Q7 and the transistor Q5 off state. 进一步地,所述MCU控制单元8〇包括有单片机U1及其外围电路。 Further, the control unit MCU comprises 8〇 microcontroller U1 and its peripheral circuit.

[0034] 为了便于监测交流侧的电信号,本实施例还包括有一交流采样单元90,所述交流采样单元90连接于输入整流单元10的输入端与MCU控制单元80之间,所述交流采样单元90 用于采集输入整流单元10交流侧的电压并反馈至MCU控制单元80。 [0034] In order to facilitate monitoring of the electrical signal AC side, the present embodiment further comprises an alternating current sampling unit 90, the sampling unit 90 is connected to the AC input terminal and the input control unit MCU 10 between the rectifying unit 80, the AC sampling means 90 for rectifying an input voltage acquisition unit 10 and the AC side of the feedback control unit 80 to the MCU.

[0035] 关于该交流采样单元90的具体组成,所述交流采样单元90包括有运放U9B,所述运放U9B的两个输入端分别通过限流电阻而连接于输入整流单元10的输入端,所述运放U9B的输出端连接于MCU控制单元80。 [0035] The specific composition of the AC sampling unit 90, the AC input terminal of the sampling unit 90 comprising operational amplifier U9B, two input terminals of the operational amplifier U9B through the current limiting resistor are respectively connected to the input of the rectifying unit 10 , the output terminal of the operational discharge U9B connected to the control unit MCU 80.

[0036] 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M⑶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。 [0036] In order to facilitate real-time acquisition of the current, said third switching transistor having a first sampling resistor R2A between the source of Q5 is connected to the front end, a source of the third switching transistor Q5 is connected to the control unit 80 M⑶ , by the first sampling resistor R2A MCU control unit 80 makes the acquisition source of the third switching transistor Q5 electrical signal.

[0037]作为一种优选方式,为了对直流侧电信号进行采集,本实施例还包括有一DC电压采样单元60,所述DC电压采样单元60包括有依次串联的第二采样电阻R13和第三采样电阻R15,所述第二采样电阻R13的前端连接于LLC隔离变换器单元40的输出端,所述第三采样电阻R15的后端连接于MCU控制单元80,藉由所述第二采样电阻R13和第三采样电阻R15而令MCU控制单元80采集LLC隔离变换器单元40输出端的电信号。 [0037] As a preferred embodiment, the electrical signal to the DC-side collection, the present embodiment further includes a DC voltage sampling unit 60, the DC voltage sampling unit 60 comprises a second sampling resistor R13 in series and a third sampling resistor R15, the second front-end sampling resistor R13 is connected to the output 40 of the LLC converter unit spacer, the rear end of the third sampling resistor R15 is connected to the MCU control unit 80, by the second sampling resistor R13 and resistor R15 and the third sampling control unit 80 makes the acquisition LLC MCU isolated electrical output of the converter unit 40.

[0038] 关于逆变部分,所述逆变倒相单元70包括由第四开关管Q1、第五开关管Q2、第六开关管Q3和第七开关管Q4组成的逆变桥,所述第四开关管Q1的栅极、第五开关管Q2的栅极、第六开关管Q3的栅极和第七开关管Q4的栅极分别连接于MCU控制单元80,藉由所述MCU控制单元80而控制第四开关管Q1、第五开关管Q2、第六开关管Q3和第七开关管Q4导通或截止,以令所述逆变倒相单元70输出交流电压。 [0038] For the inverter section, the inverter unit 70 includes an inverter by the fourth switching transistor Q1, the fifth switching transistor Q2, the sixth switch and the seventh switch transistor Q4 Q3 composed of inverter bridge, said first the gate of the fourth switching transistor Q1, a gate of the fifth switching transistor Q2, the gate of the sixth switching transistor Q3 and the seventh transistor Q4 are connected to the control unit MCU 80, the MCU control unit 80 by and controlling the fourth switching transistor Q1, the fifth switching transistor Q2, the sixth switching transistor Q3 and the seventh transistor Q4 is turned on or off, so that unit 70 to the inverter output AC voltage inverter.

[0039] 上述逆变倒相单元70中,经过C3滤波后的直流电压经Q1、负载、Q4形成回路给负载供电形成第一个半周期工频电平;第二个半周期工频电平通过Q2、负载、Q3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。 [0039] The inverter inverting unit 70, the DC voltage through Q1 through the filter C3, load, Q4 form a loop to power the load form a first half-cycle frequency level; second half cycle frequency level by Q2, load, Q3 form a loop, so that the load on the formation of a complete correction wave frequency AC voltage. 控制芯片U1输出的PWM信号经驱动电路后分别送出?丽川、?¥111^、? PWM control chip U1 output signals are fed via the driving circuit? Yeocheon,? ¥ 111 ^ ,? 刪21?麵21^合〇1、〇2、〇3、〇4的6八了£极。 Delete 21? 21 ^ face together 〇1, 〇2, 〇3, 〇4 a £ 6 eight poles. 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。 Inverted phase-frequency phase inverter circuit operates according to a control chip set mode.

[0040] 本发明公开的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其相比现有技术而3 '首先,本发明具有局PF值,实现了电网与输出端隔离,安全性非常高,同时,在输入全电压犯围内能够能i动调节输出电压,并且固定输出频率,再次,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,本发明方案含有电压与电流采样电路,能防浪涌电压与电流。 [0040] The present invention is based on the disclosure PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit and the 3 'First, the present invention has a PF value compared to the prior art bureau, to achieve the output terminal of the power isolation, security It is very high, while in the full input voltage can be made around i can automatically adjust the output voltage and the output frequency is fixed, again, the output voltage is corrected wave output, automatic shaping the AC voltage, in addition, the present invention comprises voltage and current sensing circuit, can prevent surge voltage and current.

[0041]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。 [0041] The above-described embodiments are merely preferred embodiments of the present invention is not intended to limit the present invention, any modifications within the scope of the invention is made, equivalent replacements or improvements should be included in the claimed invention range.

Claims (10)

1. 一种基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,包括有: 一输入整流单元,其输入端连接电网,用于对电网电压进行整流; 一滤波单元,连接于输入整流单元的输出端,用于对输入整流单元输出的电压进行滤波; 一PFC升压单元,连接于滤波单元的输出端,用于对滤波单元输出的电压进行升压转换; 一LLC隔离变换器单元,包括有第一开关管、第二开关管、第一续流二极管、第二续流二极管、变压器、谐振电容和放电电阻,所述第一开关管的漏极连接于PFC升压单元的输出端, 所述第一开关管的源极连接于变压器的第一端,所述变压器的第二端通过谐振电容连接前端地,所述第二开关管的漏极连接于第一开关管的源极,所述第二开关管的源极通过放电电阻连接前端地,所述第一开关管的栅极和第二开关管的栅极用于加载两路相 1. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit comprising: a rectifying unit input, an input terminal connected to the grid, a grid voltage is rectified; a filtering unit are connected in the input and output terminals of the rectifying unit for rectifying a voltage input to output filtering means; a PFC boost means connected to the output end of the filter unit, means for filtering the voltage output by the boost converter; an isolation LLC converter means comprises a first switch, a second switch, a first freewheeling diode, the second freewheeling diode, a transformer, a resonant capacitor and a discharge resistor, the drain of the first switching transistor is connected to a PFC boost output of the unit, the source of the first switching transistor is connected to the first end of the transformer, said transformer resonant capacitor through a second end connected to the distal end, the drain of the second switching transistor is connected to the first switch source tube, a source of the second switching transistor is connected to the front end by the discharge resistor, the gate of the first switch and the second switch for a two-phase loading 相反的PWM脉冲信号,以令所述第一开关管和第二开关管交替导通,所述变压器副边绕组的第一端连接于第一续流二极管的阳极,所述变压器副边绕组的第二端连接于第二续流二极管的阳极,所述第一续流二极管的阴极和第二续流二极管的阴极均连接后端地,所述变压器副边绕组的中间抽头作为LLC隔离变换器单元的输出端; 一DC电压滤波单元,包括有第一电解电容,所述第一电解电容的正极连接于LLC隔离变换器单元的输出端,所述第一电解电容的负极连接后端地; 一逆变倒相单元,连接于LLC隔离变换器单元的输出端,所述逆变倒相单元用于对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。 Instead of the PWM pulse signal to cause the first switch and the second switch alternately conducting, the transformer secondary winding first end connected to the anode of the first freewheeling diode, the secondary winding of the transformer a cathode terminal connected to the second anode of the second freewheel diode, said first freewheeling diode and the cathode of the second freewheel diode are connected to the rear end, the middle of the secondary winding of the isolated converter transformer tap as LLC output terminal means; a DC voltage filtering means comprises a first electrolytic capacitor of the first electrolytic capacitor is connected to the positive output terminal of the isolation LLC converter unit, the first electrolytic capacitor anode connected to a rear end; an inverter inverting means, connected to the LLC converter unit output terminal of the isolation, after the inverter unit for inverting isolation LLC converter unit converting an output of the inverter output AC voltage.
2.如权利要求1所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述第一开关管的栅极与源极之间连接有第一下拉电阻。 2. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit of claim 1 wherein, a first pull-down resistor between the gate and source of the first switch is connected to claim.
3.如权利要求1所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述第二开关管的栅极与源极之间连接有第二下拉电阻。 3. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit of claim 1 characterized in that, a second pull-down resistor between the gate and source of the second switch is connected to claim.
4.如权利要求1所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述滤波单元包括有滤波电容,所述滤波电容连接于输入整流单元的输出端与前端地之间。 4. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit of claim 1 wherein said filtering means comprises a filter capacitor, said filter capacitor connected to the output and the input of the rectifying unit as claimed in claim between the front end.
5.如权利要求1所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述PFC升压单元包括有升压电感、第三开关管、第一整流二极管和第二电解电容,所述升压电感的前端连接于滤波单元的输出端,所述升压电感的后端连接于第三开关管的漏极,所述第三开关管的源极接前端地,所述第三开关管的栅极用于接入一路PWM控制信号, 所述第三开关管的漏极连接第一整流二极管的阳极,所述第一整流二极管的阴极作为PFC 升压单元的输出端,且该第一整流二极管的阴极连接第二电解电容的正极,第二电解电容的负极接前端地。 PFC-based intelligence as claimed in the full-bridge LLC resonant wave corrected voltage converting circuit according to a third switching transistor, and a first rectifier diode, characterized in that said means comprises a boost PFC boost inductor, a second electrolytic capacitor, the front end of the boost inductor is connected to the output end of the filter unit, the rear end of the boost inductor is connected to the drain of the third switch transistor, the source of the third switching transistor is connected to the front end , the gate of the third switching transistor for accessing a PWM control signal, a drain of the third switching transistor is connected to the anode of a first rectifier diode, the cathode of the first rectifier diode as PFC boost unit an output terminal, and the cathode of the first rectifier diode connected to the cathode of the second electrolytic capacitor, the electrolytic capacitor of the second distal end connected to the negative electrode.
6.如权利要求5所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述第三开关管的栅极与前端地之间连接有第三下拉电阻。 6. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit of claim 5 characterized in that, a third pull-down resistor between the gate and the front end of the tube is connected to the third switch as claimed in claim.
7.如权利要求5所述的基于PFC与LLC谐振的智能全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,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。 7. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit according to claim 5, characterized in that, further comprising a control unit MCU, the gate of the first switch, the second switch tube and the gate of the third switch transistor are connected to a control unit MCU, the MCU control unit for respectively outputting a first PWM signal to the switch, the second switch and the third switch, to control the first switch , the second switch and the third switch-off state.
8.如权利要求7所述的基于PFC与LLC谐振的智能全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,所述交流采样单元连接于输入整流单元的输入端与MCU控制单元之间,所述交流采样单元用于采集输入整流单元交流侧的电压并反馈至MCU控制单元。 8. Based on PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit of claim 7 wherein further comprising a sampling unit exchange, the sampling unit is connected to the AC input terminal and the input of the rectifying unit MCU claim between the control unit, said voltage sampling means for sampling AC input rectifier means and fed back to the AC side of the control unit MCU.
9.如权利要求7所述的基于PFC与LLC谐振的智能全桥修正波电压转换电路,其特征在于,所述第三开关管的源极与前端地之间连接有第一采样电阻,所述第三开关管的源极连接于MCU控制单元,藉由所述第一采样电阻而令MCU控制单元采集第三开关管源极的电信号。 As claimed in claim 9 with the PFC-based full-bridge LLC resonant intelligent correction wave voltage conversion circuit of claim 7 wherein, a first sampling resistor between the source of the third switching transistor is connected to the front end, the the source of said third transistor is connected to a control unit MCU, by the first sampling resistor and the control unit MCU make electrical signal acquisition third transistor source.
10.如权利要求7所述的基于PFC与LLC谐振的智能全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,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M⑶控制单元,藉由所述第二采样电阻和第三采样电阻而令MCU控制单元采集LLC隔离变换器单元输出端的电信号。 As claimed in claim 7 based on the PFC and LLC resonant full bridge intelligent correction wave voltage conversion circuit further comprises a DC voltage sampling unit, the sampling unit comprises a DC voltage in series with a second sample of sampling resistor and a third resistor, the second distal end is connected to the sampling resistor isolation LLC converter unit output terminal, the rear end of the third resistor is connected to a sampling M⑶ control unit, and by the second sampling resistor third sampling resistance so that the control unit MCU collecting electrical isolation LLC converter unit output.
CN201611160692.1A 2016-12-15 2016-12-15 PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit CN106787793A (en)

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