CN209593312U - Soft Switching High Power Factor AC-DC Converter - Google Patents

Soft Switching High Power Factor AC-DC Converter Download PDF

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CN209593312U
CN209593312U CN201821774471.8U CN201821774471U CN209593312U CN 209593312 U CN209593312 U CN 209593312U CN 201821774471 U CN201821774471 U CN 201821774471U CN 209593312 U CN209593312 U CN 209593312U
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tube
switching
power factor
capacitor
circuit
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谢小高
董汉菁
王奇钢
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Hangzhou Dianzi University
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    • 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 e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The utility model discloses a kind of Sofe Switch High Power Factor A.C.-D.C. converters, the utility model proposes Sofe Switch High Power Factor A.C.-D.C. converter can realize that the no-voltage of switching tube of circuit of power factor correction opens (Sofe Switch) in full voltage input range, and obtain higher power factor;Only have an input rectifying pipe conducting in every half power frequency period, reduces the loss of input rectification circuit;The quasi-single-stage soft switch power factor correcting circuit that a kind of connection type of the utility model is constituted is compared with traditional Boost type quasi-single-stage circuit, busbar voltage can substantially reduce, therefore the voltage stress of switching tube can be reduced, is applied to full voltage input range (90V-265Vac).

Description

软开关高功率因数交流-直流变换器Soft Switching High Power Factor AC-DC Converter

技术领域technical field

本实用新型属于开关电源技术领域,涉及一种软开关高功率因数交流-直流变换器。The utility model belongs to the technical field of switching power supplies and relates to a soft-switching high power factor AC-DC converter.

背景技术Background technique

电力电子装置的广泛应用,给公用电网造成严重污染,谐波和无功问题日益受到重视。为了减轻电力污染的危害程度,许多国家纷纷制定了相应的标准,如国际电工委员会的谐波标准IEEE555-2和IEC1000-3-2等。功率因数校正(Power Factor Correction,简称PFC)技术,如有源功率因数校正(Active Power Factor Correction,简称APFC)技术可以有效地抑制谐波,因此功率因数校正电路(PFC)常被用于交流-直流电力电子变换装置的前级。The wide application of power electronic devices has caused serious pollution to the public grid, and the problems of harmonics and reactive power have been paid more and more attention. In order to reduce the harm of electric power pollution, many countries have formulated corresponding standards, such as the harmonic standards IEEE555-2 and IEC1000-3-2 of the International Electrotechnical Commission. Power Factor Correction (PFC) technology, such as Active Power Factor Correction (APFC) technology can effectively suppress harmonics, so power factor correction circuits (PFC) are often used in AC- The front stage of the DC power electronic conversion device.

图1示出了一种传统的两级式交流-直流电力电子变换装置的拓扑结构。前级通常采用升压(Boost)电路作为功率因数校正,以实现交直流能量转换并输出稳定直流电压;后级采用高效率的半桥LLC谐振变换器,实现隔离和降压功能。Figure 1 shows the topology of a traditional two-stage AC-DC power electronic conversion device. The front stage usually uses a boost (Boost) circuit as power factor correction to achieve AC-DC energy conversion and output a stable DC voltage; the latter stage uses a high-efficiency half-bridge LLC resonant converter to achieve isolation and step-down functions.

Boost电路作为前级功率因素校正电路的优点是结构简单,容易获得较高的功率因数,然而其也存在一定的缺点,如采用电流连续模式,则其续流二极管存在较大反向恢复问题,开关过程为硬开关,导致效率降低;而如采用断续模式,则输入电流峰值较大,开关过程为硬开关,效率较低,此外电感体积较大;采用电流临界导通模式,虽然可以实现开关管的零电压开通以降低损耗,但是检测电感绕组两端电压,增加了控制的复杂性,此外,在高压输入情况下,只能实现开关管在谐振谷底导通,并不能实现完全的软开关。The advantage of the Boost circuit as a pre-stage power factor correction circuit is that it has a simple structure and is easy to obtain a higher power factor. However, it also has certain disadvantages. If the current continuous mode is used, the freewheeling diode has a large reverse recovery problem. The switching process is a hard switch, resulting in a decrease in efficiency; and if the discontinuous mode is used, the peak value of the input current is large, the switching process is a hard switch, and the efficiency is low. In addition, the inductance is large; the current critical conduction mode is used, although it can be realized The switch tube is turned on at zero voltage to reduce loss, but the detection of the voltage across the inductor winding increases the complexity of the control. In addition, in the case of high voltage input, the switch tube can only be turned on at the bottom of the resonance valley, and it cannot achieve complete softness. switch.

发明内容Contents of the invention

本实用新型提出一种软开关高功率因数交流-直流变换器,所述软开关高功率因数交流-直流变换器包括软开关功率因数校正电路,其中The utility model proposes a soft-switching high power factor AC-DC converter, the soft-switching high power factor AC-DC converter includes a soft-switching power factor correction circuit, wherein

所述软开关功率因数校正电路包括:滤波器、整流管D1、整流管D2、续流管D3、续流管D4、电感L1、电容C1、开关管Q1、开关管Q2、电容CB;The soft switching power factor correction circuit includes: a filter, a rectifier tube D1, a rectifier tube D2, a freewheel tube D3, a freewheel tube D4, an inductor L1, a capacitor C1, a switch tube Q1, a switch tube Q2, and a capacitor CB;

其中,滤波器的一个输入端接交流源Vac的一端,其另一输入端交流源Vac的另一端,滤波器的一个输出端接接整流管D1的阳极和整流管D2的阴极,滤波器的一个输出端接接续流管D3的阳极和续流管D4的阴极,整流管D1的阴极接续流管D3的阴极、开关管Q1的漏极以及电容CB的正端,整流管D2的阳极接续流管D4的阳极、开关管Q2的源极、电容CB的负端以及参考地,续流管D3的阳极接电感L1的一端,电感L1的另一端接电容C1的一端,电容C1的另一端接开关管Q1的源极以及开关管Q2的漏极,开关管Q1和开关管Q2的栅极分别接收控制电路输出的驱动信号;Among them, one input terminal of the filter is connected to one end of the AC source Vac, and the other input terminal of the filter is connected to the other end of the AC source Vac, and one output terminal of the filter is connected to the anode of the rectifier tube D1 and the cathode of the rectifier tube D2, and the filter's One output terminal is connected to the anode of the freewheeling tube D3 and the cathode of the freewheeling tube D4, the cathode of the rectifier tube D1 is connected to the cathode of the freewheeling tube D3, the drain of the switching tube Q1 and the positive terminal of the capacitor CB, and the anode of the rectifier tube D2 is connected to the freewheeling tube The anode of the tube D4, the source of the switching tube Q2, the negative terminal of the capacitor CB and the reference ground, the anode of the freewheeling tube D3 are connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to The source of the switching tube Q1 and the drain of the switching tube Q2, and the gates of the switching tube Q1 and the switching tube Q2 respectively receive the drive signal output by the control circuit;

所述软开关功率因数校正电路实现对交流输入电流的校正,使得交流输入电流波形接近正弦波,并在电容CB两端输出一直流电压;The soft switching power factor correction circuit realizes the correction of the AC input current, makes the AC input current waveform close to a sine wave, and outputs a DC voltage at both ends of the capacitor CB;

优选的,还包括负载,所述负载接电容CB的正端(A端)和负端(B端)之间,负载是电阻、LED、蓄电池等无源负载或直流-直流变换电路;Preferably, it also includes a load, the load is connected between the positive terminal (A terminal) and the negative terminal (B terminal) of the capacitor CB, and the load is a passive load such as a resistor, an LED, a storage battery, or a DC-DC conversion circuit;

优选的,还包括负载,所述负载接开关管Q1和开关管Q2构成的开关桥臂中点(C端)与电容CB的负端(B端)之间,负载可以是电阻或直流-直流变换电路;Preferably, a load is also included, and the load is connected between the midpoint (terminal C) of the switch bridge arm formed by the switch tube Q1 and the switch tube Q2 and the negative terminal (terminal B) of the capacitor CB, and the load can be resistance or DC-DC conversion circuit;

优选的,还包括负载,所述负载接开关管Q1和开关管Q2构成的开关桥臂中点(C端)与构成电容CB的两个串联电容的中点(D端)之间,负载可以是电阻或直流-直流变换电路;Preferably, a load is also included, and the load is connected between the midpoint (C terminal) of the switch bridge arm formed by the switch tube Q1 and the switch tube Q2 and the midpoint (D terminal) of the two series capacitors forming the capacitor CB, and the load can be is a resistor or a DC-DC conversion circuit;

所述直流-直流变换电路将电容CB两端的直流电压进行直流电压变换或转换为直流电流;The DC-DC conversion circuit converts the DC voltage across the capacitor CB into a DC voltage or converts it into a DC current;

优选的,所述软开关高功率因数交流-直流变换器还包括控制电路,所述控制电路可以是PFM控制、PWM控制或PFM+PWM控制;Preferably, the soft-switching high power factor AC-DC converter also includes a control circuit, and the control circuit can be PFM control, PWM control or PFM+PWM control;

优选的,所述控制电路包括PFM控制误差放大环节、锯齿波发生电路、PWM控制误差放大环节、比较器Com2、驱动信号发生电路。Preferably, the control circuit includes a PFM control error amplification link, a sawtooth wave generation circuit, a PWM control error amplification link, a comparator Com2, and a drive signal generation circuit.

进一步,所述PFM控制误差放大环节包括电阻R1、第一补偿网络、第一运放OP1和电压基准Vref1,所述电阻R1一端接FB端,接收主电路反馈的输出电压或电流信号,电阻R1的另一端接第一补偿网络的一端及运放OP1的负输入端,运放OP1的正输入端接电压基准Vref1的正端,电压基准Vref1的负端接参考地,第一补偿网络的输出端接第一运放OP1的输出端;PFM控制误差放大环节对FB接收的信号与电压基准Vref1之间的信号差值进行比较、放大,产生误差放大信号Vcomp1;Further, the PFM control error amplification link includes a resistor R1, a first compensation network, a first operational amplifier OP1 and a voltage reference Vref1, one end of the resistor R1 is connected to the FB end, and receives the output voltage or current signal fed back by the main circuit, and the resistor R1 The other end of the first compensation network is connected to one end of the first compensation network and the negative input end of the operational amplifier OP1, the positive input end of the operational amplifier OP1 is connected to the positive end of the voltage reference Vref1, the negative end of the voltage reference Vref1 is connected to the reference ground, and the output of the first compensation network The terminal is connected to the output terminal of the first operational amplifier OP1; the PFM control error amplification link compares and amplifies the signal difference between the signal received by FB and the voltage reference Vref1, and generates an error amplification signal Vcomp1;

所述锯齿波发生电路包括电压基准Vref2、压控电流源VCI、电容C1、开关S1、电压基准Vref4、比较器Com1,压控电流源VCI的负输入端接运放OP1的输出端,压控电流源VCI的正输入端接电压基准Vref3的正端,电压基准Vref3的负端接参考地,压控电流源VCI的一个输出端接参考地,另一个输出端接电容C1的一端、开关S1的一端以及比较器Com1的负输入端,比较器Com1的正输入端接电压基准Vref4的一端比较器Com1的输出端接开关S1的控制端,开关S1的另一端接地;锯齿波发生电路根据接收的误差放大信号Vcomp1产生频率可变的锯齿波信号Vsaw;The sawtooth wave generation circuit includes a voltage reference Vref2, a voltage-controlled current source VCI, a capacitor C1, a switch S1, a voltage reference Vref4, and a comparator Com1. The positive input terminal of the current source VCI is connected to the positive terminal of the voltage reference Vref3, the negative terminal of the voltage reference Vref3 is connected to the reference ground, one output terminal of the voltage-controlled current source VCI is connected to the reference ground, the other output terminal is connected to one end of the capacitor C1, and the switch S1 One end of the comparator Com1 and the negative input end of the comparator Com1, the positive input end of the comparator Com1 is connected to one end of the voltage reference Vref4, the output end of the comparator Com1 is connected to the control end of the switch S1, and the other end of the switch S1 is grounded; the sawtooth wave generating circuit receives The error amplification signal Vcomp1 generates a frequency-variable sawtooth signal Vsaw;

所述PWM控制误差放大环节包括电阻R2、第二补偿网络、运放OP2和电压基准Vref2和限幅器LIMV,所述电阻R2一端接VFB端,接收主电路反馈的输出电压信号,电阻R2的另一端接第二补偿网络的一端及运放OP2的负输入端,运放OP2的正输入端接电压基准Vref2的正端,电压基准Vref2的负端接参考地,第二补偿网络的输出端接运放OP2的输出端,运放OP2的输出端接限幅器LIMV2的输入端,限幅器LIMV2的输出端输出误差放大信号Vcomp2;PWM控制误差放大环节对VFB接收的信号与电压基准Vref1之间的信号差值进行比较、放大经限幅器LIMV限制幅值之后输出误差放大信号Vcomp2;The PWM control error amplification link includes a resistor R2, a second compensation network, an operational amplifier OP2, a voltage reference Vref2, and a limiter LIMV. One end of the resistor R2 is connected to the VFB end to receive the output voltage signal fed back by the main circuit. The other end is connected to one end of the second compensation network and the negative input end of the operational amplifier OP2, the positive input end of the operational amplifier OP2 is connected to the positive end of the voltage reference Vref2, the negative end of the voltage reference Vref2 is connected to the reference ground, and the output end of the second compensation network Connect the output terminal of the operational amplifier OP2, the output terminal of the operational amplifier OP2 is connected to the input terminal of the limiter LIMV2, and the output terminal of the limiter LIMV2 outputs the error amplification signal Vcomp2; the PWM control error amplification link compares the signal received by VFB with the voltage reference Vref1 Compare the signal difference between them, amplify and output the error amplification signal Vcomp2 after limiting the amplitude by the limiter LIMV;

比较器Com2的负输入端接锯齿波发生电路的输出端,接收锯齿波信号Vsaw,比较器Com2的正输入端接PWM控制误差放大环节的输出端,接收其输出的误差放大信号Vcomp2;比较器Com2对接收的锯齿波信号Vsaw和误差放大信号Vcomp2进行比较,输出脉冲信号Vpulse;The negative input terminal of the comparator Com2 is connected to the output terminal of the sawtooth wave generating circuit to receive the sawtooth signal Vsaw, and the positive input terminal of the comparator Com2 is connected to the output terminal of the PWM control error amplification link to receive the output error amplification signal Vcomp2; the comparator Com2 compares the received sawtooth signal Vsaw with the error amplifier signal Vcomp2, and outputs the pulse signal Vpulse;

所述驱动信号发生电路包括反相器INV、第一延时电路、第二延时电路、与门AND1、与门AND2以及驱动电路;所述反相器INV的输入端接第二延时电路的输入端和与门AND2的一个输入端,接收脉冲信号Vpulse,反相器INV的输出端接第一延时电路的输入端和与门AND1的一个输入端,与门AND1的输出端接驱动电路的一个输入端,驱动电路的两个输出端分别输出驱动信号Vg_Q1和Vg_Q2;所述第一延时电路和第二延时电路分别产生延时Td1和Td2,用于产生驱动信号Vg_Q1和Vg_Q2之间的死区时间,所述驱动电路用于增强驱动能力以及驱动信号自举。The driving signal generation circuit includes an inverter INV, a first delay circuit, a second delay circuit, an AND gate AND1, an AND gate AND2 and a drive circuit; the input terminal of the inverter INV is connected to the second delay circuit The input terminal of the AND gate AND2 receives the pulse signal Vpulse, the output terminal of the inverter INV is connected to the input terminal of the first delay circuit and an input terminal of the AND gate AND1, and the output terminal of the AND gate AND1 is connected to the drive One input terminal of the circuit, two output terminals of the drive circuit output drive signals V g_Q1 and V g_Q2 respectively ; the first delay circuit and the second delay circuit generate delay Td1 and Td2 respectively for generating the drive signal V The dead time between g_Q1 and V g_Q2 , the driving circuit is used to enhance the driving capability and drive signal bootstrapping.

优选的,一种软开关高功率因数交流-直流变换器,包括所述软开关功率因数校正电路和半桥LLC谐振直流-直流变换电路,所述半桥LLC谐振直流-直流变换电路的开关管与软开关高功率因数校正电路的开关管复用,所述半桥LLC谐振直流-直流变换电路还包括谐振电感Lr、谐振电容Cr、变压器T2、输出整流电路、输出电容Co;谐振电感Lr的一端接开关管Q1的源极和开关管Q2的漏极,谐振电感Lr的另一端接谐振电容Cr的一端,谐振电容Cr的另一端接变压器T2原边绕组的一端,变压器T2原边绕组的另一端接参考地,变压器T2的副边绕组接输出整流器的输入端,输出整流器的输出端接输出电容Co;Preferably, a soft-switching high power factor AC-DC converter includes the soft-switching power factor correction circuit and the half-bridge LLC resonant DC-DC conversion circuit, and the switching tube of the half-bridge LLC resonant DC-DC conversion circuit Multiplexed with the switching tube of the soft-switching high power factor correction circuit, the half-bridge LLC resonant DC-DC conversion circuit also includes a resonant inductor Lr, a resonant capacitor Cr, a transformer T2, an output rectifier circuit, and an output capacitor Co; the resonant inductor Lr One end is connected to the source of the switching tube Q1 and the drain of the switching tube Q2, the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T2, and the primary winding of the transformer T2 The other end is connected to the reference ground, the secondary winding of the transformer T2 is connected to the input end of the output rectifier, and the output end of the output rectifier is connected to the output capacitor Co;

优选的,一种软开关高功率因数交流-直流变换器,包括所述软开关功率因数校正电路和半桥反激电路,所述半桥反激电路的开关管与软开关高功率因数校正电路的开关管复用。所述半桥反激电路还包括隔直电容Cx、变压器T3、输出整流管Do、输出电容Co;隔直电容Cx的一端接开关管Q1的源极和开关管Q2的漏极,隔直电容Cx的另一端接变压器T3原边绕组的同名端,变压器T3原边绕组的异名端接参考地,变压器T3的副边绕组异名端接输出整流器Do的输入端,输出整流器Do的输出端接输出电容Co的正端,输出电容Co的负端接变压器T3副边绕组的同名端;Preferably, a soft-switching high power factor AC-DC converter includes the soft-switching power factor correction circuit and a half-bridge flyback circuit, the switching tube of the half-bridge flyback circuit and the soft-switching high power factor correction circuit The switching tube is multiplexed. The half-bridge flyback circuit also includes a DC blocking capacitor Cx, a transformer T3, an output rectifier Do, and an output capacitor Co; one end of the DC blocking capacitor Cx is connected to the source of the switching tube Q1 and the drain of the switching tube Q2, and the DC blocking capacitor The other end of Cx is connected to the same-name end of the primary winding of the transformer T3, the opposite-name end of the primary winding of the transformer T3 is connected to the reference ground, the opposite-name end of the secondary winding of the transformer T3 is connected to the input end of the output rectifier Do, and the output end of the output rectifier Do Connect to the positive end of the output capacitor Co, and the negative end of the output capacitor Co to the same-named end of the secondary winding of the transformer T3;

优选的,所述软开关高功率因数交流-直流变换器中的整流管D1、整流管D2和续流管D3、续流管D4是二极管,Preferably, the rectifier D1, rectifier D2, freewheel D3 and freewheel D4 in the soft-switching high power factor AC-DC converter are diodes,

优选的,所述软开关高功率因数交流-直流变换器中的整流管D1、整流管D2和续流管D3、续流管D4也可以部分或全部是MOSFET。Preferably, the rectifier D1, the rectifier D2, the freewheel D3 and the freewheel D4 in the soft-switching high power factor AC-DC converter may also be part or all of MOSFETs.

本实用新型的有益效果在于:本实用新型提出的软开关高功率因数交流-直流变换器可以实现功率因数校正电路的开关管在全输入电压范围内的零电压开通(软开关),并获得较高的功率因数;在每半工频周期仅有一个输入整流管导通,降低了输入整流电路的损耗;本实用新型的一种连接方式构成的准单级软开关功率因数校正电路与传统的Boost型准单级电路相比,母线电压可以大大降低,因此可以降低开关管的电压应力,应用于全电压输入范围(90V-265Vac)。The beneficial effect of the utility model is that: the soft switch high power factor AC-DC converter proposed by the utility model can realize the zero-voltage turn-on (soft switch) of the switch tube of the power factor correction circuit in the full input voltage range, and obtain relatively High power factor; only one input rectifier is turned on in each half power frequency cycle, which reduces the loss of the input rectifier circuit; the quasi-single-stage soft switching power factor correction circuit composed of a connection method of the utility model is different from the traditional Compared with the Boost type quasi-single-stage circuit, the bus voltage can be greatly reduced, so the voltage stress of the switch tube can be reduced, and it can be applied to the full voltage input range (90V-265Vac).

附图说明Description of drawings

图1为一种现有技术的两级式交流-直流电力电子变换器;Fig. 1 is a kind of prior art two-stage AC-DC power electronic converter;

图2示出本实用新型的软开关高功率因数交流-直流变换器第一种电路结构图;Fig. 2 shows the first circuit structure diagram of the soft-switching high power factor AC-DC converter of the present invention;

图3示出本实用新型的软开关高功率因数交流-直流变换器第二种电路结构图;Fig. 3 shows the second circuit structure diagram of the soft-switching high power factor AC-DC converter of the present invention;

图4示出本实用新型的软开关高功率因数交流-直流变换器第三种电路结构图;Fig. 4 shows the third circuit structure diagram of the soft-switching high power factor AC-DC converter of the present invention;

图5示出了本实用新型的软开关高功率因数交流-直流变换器的部分关键波形;Fig. 5 shows some key waveforms of the soft-switching high power factor AC-DC converter of the present invention;

图6示出了本实用新型的软开关高功率因数电路第一工作模态下的等效电路示意图;Fig. 6 shows a schematic diagram of an equivalent circuit in the first working mode of the soft-switching high power factor circuit of the present invention;

图7示出了本实用新型的软开关高功率因数电路第二工作模态下的等效电路示意图;Fig. 7 shows a schematic diagram of an equivalent circuit in the second working mode of the soft-switching high power factor circuit of the present invention;

图8示出了本实用新型的软开关高功率因数电路第三工作模态下的等效电路示意图;Fig. 8 shows a schematic diagram of an equivalent circuit in the third working mode of the soft-switching high power factor circuit of the present invention;

图9示出了本实用新型的软开关高功率因数电路第四工作模态下的等效电路示意图;Fig. 9 shows a schematic diagram of an equivalent circuit in the fourth working mode of the soft-switching high power factor circuit of the present invention;

图10示出了本实用新型的软开关高功率因数电路第五工作模态下的等效电路示意图;Fig. 10 shows a schematic diagram of an equivalent circuit in the fifth working mode of the soft-switching high power factor circuit of the present invention;

图11示出了本实用新型的软开关高功率因数电路第六工作模态下的等效电路示意图;Fig. 11 shows a schematic diagram of an equivalent circuit in the sixth working mode of the soft-switching high power factor circuit of the present invention;

图12示出了本实用新型的软开关高功率因数电路第七工作模态下的等效电路示意图;Fig. 12 shows a schematic diagram of an equivalent circuit in the seventh working mode of the soft-switching high power factor circuit of the present invention;

图13示出了本实用新型的软开关高功率因数电路第八工作模态下的等效电路示意图;Fig. 13 shows a schematic diagram of an equivalent circuit in the eighth working mode of the soft-switching high power factor circuit of the present invention;

图14示出了本实用新型的软开关高功率因数交流-直流变换器半工频周期交流输入电流计算曲线;Fig. 14 shows the calculation curve of the AC input current of the soft-switching high power factor AC-DC converter of the utility model at half power frequency period;

图15示出了本实用新型的软开关高功率因数交流-直流变换器在直流母线电压一定的情况下工作频率与交流输入电压的关系曲线;Fig. 15 shows the relationship curve between the operating frequency and the AC input voltage of the soft-switching high power factor AC-DC converter of the present invention under the condition of a certain DC bus voltage;

图16示出了适用于本实用新型的软开关高功率因数交流-直流变换器的PFM+PWM控制电路实施例;Fig. 16 shows an embodiment of a PFM+PWM control circuit suitable for a soft-switching high power factor AC-DC converter of the present invention;

图17示出了图16所示控制电路的部分关键波形;Fig. 17 shows some key waveforms of the control circuit shown in Fig. 16;

图18示出了本实用新型的软开关高功率因数交流-直流变换器第一具体实施例;Fig. 18 shows the first specific embodiment of the soft-switching high power factor AC-DC converter of the present invention;

图19示出了本实用新型的软开关高功率因数交流-直流变换器第二具体实施例;Fig. 19 shows the second specific embodiment of the soft-switching high power factor AC-DC converter of the present invention;

图20示出了本实用新型的软开关高功率因数交流-直流变换器第三具体实施例;Fig. 20 shows the third specific embodiment of the soft-switching high power factor AC-DC converter of the present invention;

图21示出了本实用新型的软开关高功率因数交流-直流变换器第四具体实施例;Fig. 21 shows the fourth specific embodiment of the soft-switching high power factor AC-DC converter of the present invention;

图22示出了本实用新型的软开关高功率因数电路中的整流管D1、D2和续流管D3、D4采用MOSFET之后的示意图;Fig. 22 shows a schematic diagram of rectifier tubes D1, D2 and freewheeling tubes D3, D4 in the soft-switching high power factor circuit of the present invention after MOSFETs are used;

具体实施方式Detailed ways

以下结合本实用新型电路结构图对本实用新型内容进行详细说明。The content of the utility model will be described in detail below in conjunction with the circuit structure diagram of the utility model.

参照图2示出的本实用新型软开关高功率因数交流-直流变换器第一种结构图,所述软开关高功率因数交流-直流变换器包括软开关功率因数校正电路和负载;Referring to the first structural diagram of the soft-switching high power factor AC-DC converter of the present invention shown in Figure 2, the soft-switching high power factor AC-DC converter includes a soft-switching power factor correction circuit and a load;

所述软开关功率因数校正电路包括:滤波器、整流管D1、整流管D2、续流管D3、续流管D4、电感L1、电容C1、开关管Q1、开关管Q2、电容CB;其中,滤波器的一个输入端接交流源Vac的一端,其另一输入端交流源Vac的另一端,滤波器的一个输出端接接整流管D1的阳极和整流管D2的阴极,滤波器的一个输出端接接续流管D3的阳极和续流管D4的阴极,整流管D1的阴极接续流管D3的阴极、开关管Q1的漏极以及电容CB的正端,整流管D2的阳极接续流管D4的阳极、开关管Q2的源极、电容CB的负端以及参考地,续流管D3的阳极接电感L1的一端,电感L1的另一端接电容C1的一端,电容C1的另一端接开关管Q1的源极以及开关管Q2的漏极,开关管Q1和开关管Q2的栅极分别接收控制电路输出的驱动信号;The soft switching power factor correction circuit includes: a filter, a rectifier tube D1, a rectifier tube D2, a freewheeling tube D3, a freewheeling tube D4, an inductor L1, a capacitor C1, a switch tube Q1, a switch tube Q2, and a capacitor CB; wherein, One input terminal of the filter is connected to one end of the AC source Vac, the other input terminal is connected to the other end of the AC source Vac, one output terminal of the filter is connected to the anode of the rectifier tube D1 and the cathode of the rectifier tube D2, one output of the filter The terminal is connected to the anode of the freewheeling tube D3 and the cathode of the freewheeling tube D4, the cathode of the rectifier tube D1 is connected to the cathode of the freewheeling tube D3, the drain of the switching tube Q1 and the positive end of the capacitor CB, and the anode of the rectifier tube D2 is connected to the freewheeling tube D4 The anode of the switch tube Q2, the source of the switch tube Q2, the negative terminal of the capacitor CB and the reference ground, the anode of the freewheeling tube D3 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the switch tube The source of Q1 and the drain of the switching tube Q2, and the gates of the switching tube Q1 and the switching tube Q2 respectively receive the drive signal output by the control circuit;

所述负载接电容CB的正端(A端)和负端(B端)之间,负载是电阻、LED、蓄电池等无源负载或直流-直流变换电路;The load is connected between the positive terminal (A terminal) and the negative terminal (B terminal) of the capacitor CB, and the load is a passive load such as a resistor, an LED, a storage battery or a DC-DC conversion circuit;

参照图3示出的本实用新型的软开关高功率因数交流-直流变换器第二种结构图,所述软开关高功率因数交流-直流变换器包括软开关功率因数校正电路和负载;Referring to the second structural diagram of the soft-switching high power factor AC-DC converter of the present invention shown in Figure 3, the soft-switching high power factor AC-DC converter includes a soft-switching power factor correction circuit and a load;

所述软开关功率因数校正电路包括:滤波器、整流管D1、整流管D2、续流管D3、续流管D4、电感L1、电容C1、开关管Q1、开关管Q2、电容CB;其中,滤波器的一个输入端接交流源Vac的一端,其另一输入端交流源Vac的另一端,滤波器的一个输出端接接整流管D1的阳极和整流管D2的阴极,滤波器的一个输出端接接续流管D3的阳极和续流管D4的阴极,整流管D1的阴极接续流管D3的阴极、开关管Q1的漏极以及电容CB的正端,整流管D2的阳极接续流管D4的阳极、开关管Q2的源极、电容CB的负端以及参考地,续流管D3的阳极接电感L1的一端,电感L1的另一端接电容C1的一端,电容C1的另一端接开关管Q1的源极以及开关管Q2的漏极,开关管Q1和开关管Q2的栅极分别接收控制电路输出的驱动信号;The soft switching power factor correction circuit includes: a filter, a rectifier tube D1, a rectifier tube D2, a freewheeling tube D3, a freewheeling tube D4, an inductor L1, a capacitor C1, a switch tube Q1, a switch tube Q2, and a capacitor CB; wherein, One input terminal of the filter is connected to one end of the AC source Vac, the other input terminal is connected to the other end of the AC source Vac, one output terminal of the filter is connected to the anode of the rectifier tube D1 and the cathode of the rectifier tube D2, one output of the filter The terminal is connected to the anode of the freewheeling tube D3 and the cathode of the freewheeling tube D4, the cathode of the rectifier tube D1 is connected to the cathode of the freewheeling tube D3, the drain of the switching tube Q1 and the positive end of the capacitor CB, and the anode of the rectifier tube D2 is connected to the freewheeling tube D4 The anode of the switch tube Q2, the source of the switch tube Q2, the negative terminal of the capacitor CB and the reference ground, the anode of the freewheeling tube D3 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the switch tube The source of Q1 and the drain of the switching tube Q2, and the gates of the switching tube Q1 and the switching tube Q2 respectively receive the drive signal output by the control circuit;

所述负载接开关管Q1和开关管Q2构成的开关桥臂中点(C端)与电容CB的负端(B端)之间,负载可以是电阻或直流-直流变换电路;The load is connected between the middle point (C terminal) of the switching bridge arm formed by the switching tube Q1 and the switching tube Q2 and the negative terminal (B terminal) of the capacitor CB, and the load can be a resistance or a DC-DC conversion circuit;

参照图4示出的本实用新型的软开关高功率因数交流-直流变换器第三种结构图,所述交流-直流变换器包括软开关功率因数校正电路和负载;Referring to the third structural diagram of the soft-switching high power factor AC-DC converter of the present invention shown in Figure 4, the AC-DC converter includes a soft-switching power factor correction circuit and a load;

所述软开关功率因数校正电路包括:滤波器、整流管D1、整流管D2、续流管D3、续流管D4、电感L1、电容C1、开关管Q1、开关管Q2、电容CB;其中,滤波器的一个输入端接交流源Vac的一端,其另一输入端交流源Vac的另一端,滤波器的一个输出端接接整流管D1的阳极和整流管D2的阴极,滤波器的一个输出端接接整流管D3的阳极和续流管D4的阴极,整流管D1的阴极接续流管D3的阴极、开关管Q1的漏极以及电容CB的正端,整流管D2的阳极接续流管D4的阳极、开关管Q2的源极、电容CB的负端以及参考地,续流管D3的阳极接电感L1的一端,电感L1的另一端接电容C1的一端,电容C1的另一端接开关管Q1的源极以及开关管Q2的漏极,开关管Q1和开关管Q2的栅极分别接收控制电路输出的驱动信号;The soft switching power factor correction circuit includes: a filter, a rectifier tube D1, a rectifier tube D2, a freewheeling tube D3, a freewheeling tube D4, an inductor L1, a capacitor C1, a switch tube Q1, a switch tube Q2, and a capacitor CB; wherein, One input terminal of the filter is connected to one end of the AC source Vac, the other input terminal is connected to the other end of the AC source Vac, one output terminal of the filter is connected to the anode of the rectifier tube D1 and the cathode of the rectifier tube D2, one output of the filter The terminal is connected to the anode of the rectifier D3 and the cathode of the rectifier D4, the cathode of the rectifier D1 is connected to the cathode of the rectifier D3, the drain of the switching tube Q1 and the positive end of the capacitor CB, and the anode of the rectifier D2 is connected to the rectifier D4 The anode of the switch tube Q2, the source of the switch tube Q2, the negative terminal of the capacitor CB and the reference ground, the anode of the freewheeling tube D3 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the switch tube The source of Q1 and the drain of the switching tube Q2, and the gates of the switching tube Q1 and the switching tube Q2 respectively receive the drive signal output by the control circuit;

所述电容CB由电容CB1和电容CB2串联构成,所述负载接开关管Q1和开关管Q2构成的开关桥臂中点(C端)与电容CB1和电容CB2的中点(D端)之间,负载可以是电阻或直流-直流变换电路;The capacitor CB is composed of a capacitor CB1 and a capacitor CB2 connected in series, and the load is connected between the midpoint (terminal C) of the switching bridge arm formed by the switching tube Q1 and the switching tube Q2 and the midpoint (terminal D) of the capacitor CB1 and the capacitor CB2 , the load can be a resistor or a DC-DC conversion circuit;

参考图5示出的本实用新型的软开关高功率因数交流-直流变换器的部分关键波形,其中Vac表示电网提供的交流输入电压,Vc1_avg为电容C1电压滤除高频分量之后的波形,iL表示流经电感L1的电流,iac表示经过滤波器流入电网的交流母线电流,iin表示滤波器之前的交流母线电流,Vg_Q1和Vg_Q2分别表示开关管Q1和开关管Q2的栅极电压,iQ1和iQ2分别表示流经开关管Q1和开关管Q2的电流;其中,为了简化起见,Vg_Q1和Vg_Q2分别只画出了交流输入电压Vac正负半周各一个开关周期的波形用于描述电路的工作过程,并且没有考虑死区时间。Referring to some key waveforms of the soft-switching high power factor AC-DC converter of the present invention shown in Fig. 5, wherein V ac represents the AC input voltage provided by the power grid, and V c1_avg is the waveform after the high-frequency component is filtered out by the capacitor C1 voltage , i L represents the current flowing through the inductor L1, i ac represents the AC bus current flowing into the power grid through the filter, i in represents the AC bus current before the filter, V g_Q1 and V g_Q2 represent the switching tube Q1 and switching tube Q2 respectively The gate voltage, i Q1 and i Q2 represent the current flowing through the switch tube Q1 and the switch tube Q2 respectively; among them, for the sake of simplicity, V g_Q1 and V g_Q2 respectively only draw a switch in the positive and negative half cycles of the AC input voltage V ac The periodic waveform is used to describe the working process of the circuit, and the dead time is not considered.

当交流输入电压Vac处于正半周期,电路的工作过程可以简单分为四个阶段:When the AC input voltage Vac is in the positive half cycle, the working process of the circuit can be simply divided into four stages:

第一阶段[t0-t1]:在t0时刻,开关管Q2关断,由于iL为负,对应的iQ1也为负,因此iQ1首先流经开关管Q1的体二极管,使得开关管Q1零电压导通,续流管D3保持导通,等效电路如图6所示。在此期间,电感L1和电容C1谐振,iL由负的最大值谐振上升,回路方程为;The first stage [t0-t1]: At time t0, the switch tube Q2 is turned off, and since i L is negative, the corresponding i Q1 is also negative, so i Q1 first flows through the body diode of the switch tube Q1, making the switch tube Q1 Zero-voltage conduction, the freewheeling tube D3 remains on, and the equivalent circuit is shown in Figure 6. During this period, the inductor L1 and the capacitor C1 resonate, and i L rises from the negative maximum resonance, and the loop equation is;

其中,VCB为电容CB两端电压,即直流母线电压。Wherein, V CB is the voltage across the capacitor CB, that is, the DC bus voltage.

第二阶段[t1-t2]:在t1时刻,由于iL上升到零,续流管D3关断,整流管D1导通,续流管D3关断,等效电路如图7所示。在此期间,电感电流iL1谐振上升,回路方程为:The second stage [t1-t2]: At time t1, since i L rises to zero, the freewheeling tube D3 is turned off, the rectifier tube D1 is turned on, and the freewheeling tube D3 is turned off. The equivalent circuit is shown in Figure 7. During this period, the inductor current i L1 rises resonantly, and the loop equation is:

第三阶段[t2-t3]:在t2时刻,开关管Q1关断,电感电流iL首先流经开关管Q2的体二极管,使得开关管Q2零电压开通,整流管D1保持导通,等效电路如图8所示。在此期间,电感电流iL谐振下降,回路方程为:The third stage [t2-t3]: At the time t2, the switching tube Q1 is turned off, and the inductor current i L first flows through the body diode of the switching tube Q2, so that the switching tube Q2 is turned on with zero voltage, and the rectifier tube D1 remains on, which is equivalent to The circuit is shown in Figure 8. During this period, the inductor current i L resonantly drops, and the loop equation is:

第四阶段[t3-t4]:在t3时刻,电感电流iL下降到零,整流管D1关断,续流管D4导通,等效电路如图9所示。在此期间,电感电流iL1继续谐振下降,回路方程为:The fourth stage [t3-t4]: At time t3, the inductor current i L drops to zero, the rectifier tube D1 is turned off, and the freewheeling tube D4 is turned on. The equivalent circuit is shown in Figure 9. During this period, the inductor current i L1 continues to resonate down, and the loop equation is:

当交流输入电压为负半周时,根据电路的对称性可知,电路的工作过程类似,整流管D2和续流管D3导通,参考t5-t9时刻的波形,电路工作过程同样可以分为四个阶段,各阶段的等效电路分别如图10-图13所示,这里不再详细分析。When the AC input voltage is a negative half cycle, according to the symmetry of the circuit, the working process of the circuit is similar. The rectifier tube D2 and the freewheeling tube D3 are turned on. Referring to the waveform at time t5-t9, the working process of the circuit can also be divided into four stage, and the equivalent circuits of each stage are shown in Figure 10-Figure 13 respectively, and will not be analyzed in detail here.

由以上电路分析可以知道,在每半个工频周期仅有一个整流管导通,因此整流电路损耗相对传统整流电路较低;此外,开关管Q1和开关管Q2都可以实现零电压导通,即实现了软开关。From the above circuit analysis, it can be known that only one rectifier is turned on in each half of the power frequency cycle, so the loss of the rectifier circuit is lower than that of the traditional rectifier circuit; in addition, both the switch tube Q1 and the switch tube Q2 can achieve zero-voltage conduction, That is, soft switching is realized.

根据以上分析近似可以计算出交流输入电流在半个工频周期的表达式为:According to the above analysis, the expression of AC input current in half power frequency cycle can be calculated as follows:

其中,开关周期Ts的表达式为:in, The expression of the switching period Ts is:

根据公式(5)和(6)可以得到交流输入电流iac的波形如图14所示,可见,交流输入电流波形非常接近正弦,从而可以计算出一定工作条件下本实用新型的软开关高功率因数电路的开关频率与交流输入电压的有效值之间的关系曲线入图15所示。由图15可知,通过调节频率可以调节直流母线电压电压相对于交流输入电压的增益,这意味着本实用新型的软开关高功率因数电路可以采用变频控制(PFM)。作为本领域技术人员也可知道,在一定的开关频率下,调节占空比的PWM方式对本实用新型的软开关高功率因数电路的电压增益进行控制,同样可以达到调节输出电压/电流的目的。因此,本实用新型的软开关高功率因数电路可以采用PFM控制、PWM控制、或PFM+PWM控制的混合控制方式。上述控制方式并未穷举出能适用于本实用新型的软开关高功率因数电路的所有可行的控制方式,本领域技术人员应当不难针对本实用新型的精神,找出其它适用的控制方式。According to the formulas (5) and (6), the waveform of the AC input current iac can be obtained as shown in Figure 14. It can be seen that the AC input current waveform is very close to sinusoidal, so that the soft switching high power factor of the utility model under certain working conditions can be calculated The relationship curve between the switching frequency of the circuit and the effective value of the AC input voltage is shown in Figure 15. It can be seen from Figure 15 that the gain of the DC bus voltage relative to the AC input voltage can be adjusted by adjusting the frequency, which means that the soft-switching high power factor circuit of the present invention can adopt frequency conversion control (PFM). As those skilled in the art can also know, at a certain switching frequency, the PWM method of adjusting the duty cycle controls the voltage gain of the soft-switching high power factor circuit of the present invention, and can also achieve the purpose of adjusting the output voltage/current. Therefore, the soft-switching high power factor circuit of the present invention can adopt PFM control, PWM control, or a mixed control mode of PFM+PWM control. The above control methods do not exhaustively list all feasible control methods applicable to the soft-switching high power factor circuit of the present invention, and those skilled in the art should not be difficult to find other applicable control methods according to the spirit of the present invention.

根据电路关系,进一步可以推导出电容C1滤除高频分量之后的电压值Vc1_avg等于交流输入电压Vac的1/2,因此电容C1还起到对交流输入电压进行分压的作用,从而使得本实用新型的软开关高功率因数电路的电压增益低于传统的Boost电路。According to the circuit relationship, it can be further deduced that the voltage value V c1_avg after the high-frequency component is filtered out by the capacitor C1 is equal to 1/2 of the AC input voltage V ac , so the capacitor C1 also functions as a voltage divider for the AC input voltage, so that The voltage gain of the soft switch high power factor circuit of the utility model is lower than that of the traditional Boost circuit.

图16示出了一种适用于本实用新型的交流-直流变换器的PFM+PWM控制电路具体实施例示意图;所述控制电路包括PFM控制误差放大环节101、锯齿波发生电路102、PWM控制误差放大环节103、比较器Com2、驱动信号发生电路104。Figure 16 shows a schematic diagram of a specific embodiment of a PFM+PWM control circuit suitable for an AC-DC converter of the present invention; the control circuit includes a PFM control error amplification link 101, a sawtooth wave generation circuit 102, and a PWM control error an amplification link 103 , a comparator Com2 , and a driving signal generating circuit 104 .

进一步,所述PFM控制误差放大环节101包括电阻R1、补偿网络1、运放OP1和电压基准Vref1,所述电阻R1一端接FB端,接收主电路反馈的输出电压或电流信号,电阻R1的另一端接补偿网络1的一端及运放OP1的负输入端,运放OP1的正输入端接电压基准Vref1的正端,电压基准Vref1的负端接参考地,补偿网络1的输出端接运放OP1的输出端;PFM控制误差放大环节101对FB接收的信号与电压基准Vref1之间的信号差值进行比较、放大,产生误差放大信号Vcomp1;Further, the PFM control error amplification link 101 includes a resistor R1, a compensation network 1, an operational amplifier OP1 and a voltage reference Vref1, one end of the resistor R1 is connected to the FB end, and receives the output voltage or current signal fed back by the main circuit, and the other end of the resistor R1 One end is connected to one end of the compensation network 1 and the negative input end of the op amp OP1, the positive input end of the op amp OP1 is connected to the positive end of the voltage reference Vref1, the negative end of the voltage reference Vref1 is connected to the reference ground, and the output end of the compensation network 1 is connected to the op amp The output terminal of OP1; the PFM control error amplification link 101 compares and amplifies the signal difference between the signal received by FB and the voltage reference Vref1, and generates an error amplification signal Vcomp1;

所述锯齿波发生电路102包括电压基准Vref2、压控电流源VCI、电容C1、开关S1、电压基准Vref4、比较器Com1,压控电流源VCI的负输入端接运放OP1的输出端,压控电流源VCI的正输入端接电压基准Vref3的正端,电压基准Vref3的负端接参考地,压控电流源VCI的一个输出端接参考地,另一个输出端接电容C1的一端、开关S1的一端以及比较器Com1的负输入端,比较器Com1的正输入端接电压基准Vref4的一端比较器Com1的输出端接开关S1的控制端,开关S1的另一端接地;锯齿波发生电路102根据接收的误差放大信号Vcomp1产生频率可变的锯齿波信号Vsaw;The sawtooth wave generating circuit 102 includes a voltage reference Vref2, a voltage-controlled current source VCI, a capacitor C1, a switch S1, a voltage reference Vref4, and a comparator Com1. The negative input terminal of the voltage-controlled current source VCI is connected to the output terminal of the op amp OP1. The positive input terminal of the current control source VCI is connected to the positive terminal of the voltage reference Vref3, the negative terminal of the voltage reference Vref3 is connected to the reference ground, one output terminal of the voltage control current source VCI is connected to the reference ground, and the other output terminal is connected to one end of the capacitor C1, the switch One end of S1 and the negative input end of the comparator Com1, the positive input end of the comparator Com1 is connected to one end of the voltage reference Vref4, the output end of the comparator Com1 is connected to the control end of the switch S1, and the other end of the switch S1 is grounded; the sawtooth wave generating circuit 102 Generate a frequency-variable sawtooth wave signal Vsaw according to the received error amplification signal Vcomp1;

所述PWM控制误差放大环节103包括电阻R2、补偿网络2、运放OP2和电压基准Vref2和限幅器LIMV,所述电阻R2一端接VFB端,接收主电路反馈的输出电压信号,电阻R2的另一端接补偿网络2的一端及运放OP2的负输入端,运放OP2的正输入端接电压基准Vref2的正端,电压基准Vref2的负端接参考地,补偿网络2的输出端接运放OP2的输出端,运放OP2的输出端接限幅器LIMV2的输入端,限幅器LIMV2的输出端输出误差放大信号Vcomp2;PWM控制误差放大环节103对VFB接收的信号与电压基准Vref1之间的信号差值进行比较、放大经限幅器LIMV限制幅值之后输出误差放大信号Vcomp2;The PWM control error amplification link 103 includes a resistor R2, a compensation network 2, an operational amplifier OP2, a voltage reference Vref2, and a limiter LIMV. One end of the resistor R2 is connected to the VFB end to receive the output voltage signal fed back by the main circuit. The other end is connected to one end of the compensation network 2 and the negative input end of the op amp OP2, the positive input end of the op amp OP2 is connected to the positive end of the voltage reference Vref2, the negative end of the voltage reference Vref2 is connected to the reference ground, and the output end of the compensation network 2 is connected to the op amp. Put the output terminal of OP2, the output terminal of the operational amplifier OP2 is connected to the input terminal of the limiter LIMV2, and the output terminal of the limiter LIMV2 outputs the error amplification signal Vcomp2; Compare the signal difference between them, amplify and output the error amplification signal Vcomp2 after limiting the amplitude by the limiter LIMV;

比较器Com2的负输入端接锯齿波发生电路102的输出端,接收锯齿波信号Vsaw,比较器Com2的正输入端接PWM控制误差放大环节103的输出端,接收其输出的误差放大信号Vcomp2;比较器Com2对接收的锯齿波信号Vsaw和误差放大信号Vcomp2进行比较,输出脉冲信号Vpulse;The negative input terminal of the comparator Com2 is connected to the output terminal of the sawtooth wave generating circuit 102 to receive the sawtooth signal Vsaw, and the positive input terminal of the comparator Com2 is connected to the output terminal of the PWM control error amplification link 103 to receive the output error amplification signal Vcomp2; The comparator Com2 compares the received sawtooth signal Vsaw with the error amplification signal Vcomp2, and outputs the pulse signal Vpulse;

所述驱动信号发生电路104包括反相器INV、延时电路1、延时电路2、与门AND1、与门AND2以及驱动电路1041;所述反相器INV的输入端接延时电路2的输入端和与门AND2的一个输入端,接收脉冲信号Vpulse,反相器INV的输出端接延时电路1的输入端和与门AND1的一个输入端,与门AND1的输出端接驱动电路的一个输入端,驱动电路1041的两个输出端分别输出驱动信号Vg_Q1和Vg_Q2;所述延时电路1和延时电路2分别产生延时Td1和Td2,用于产生驱动信号Vg_Q1和Vg_Q2之间的死区时间,所述驱动电路1041用于增强驱动能力以及驱动信号自举。The driving signal generating circuit 104 includes an inverter INV, a delay circuit 1, a delay circuit 2, an AND gate AND1, an AND gate AND2 and a drive circuit 1041; the input terminal of the inverter INV is connected to the delay circuit 2 The input terminal and an input terminal of the AND gate AND2 receive the pulse signal Vpulse, the output terminal of the inverter INV is connected to the input terminal of the delay circuit 1 and an input terminal of the AND gate AND1, and the output terminal of the AND gate AND1 is connected to the drive circuit. One input terminal, two output terminals of driving circuit 1041 respectively output driving signals V g_Q1 and V g_Q2 ; said delay circuit 1 and delay circuit 2 generate delay time Td1 and Td2 respectively, for generating driving signals V g_Q1 and V The dead time between g_Q2 , the driving circuit 1041 is used to enhance the driving capability and drive signal bootstrapping.

图17示出了图16控制电路的关键波形,包括PFM控制和PWM控制两种情况的示意图;Fig. 17 shows the key waveforms of the control circuit in Fig. 16, including schematic diagrams of two cases of PFM control and PWM control;

第一种情况:当输出电压较低使得输出电压反馈信号VFB恒低于电压基准Vref2时,Vcomp2处于恒高状态,由于限幅器LIMV的作用,使得Vcomp2被箝位于Vref4/2;PFM控制误差放大环节101起到电路调节作用,输出受电路工况影响的Vcomp1信号,Vcomp1信号与Vref3之间的差值改变压控电流源VCI的输出电流,从而调节锯齿波Vsaw的频率,而锯齿波Vsaw的峰值恒等于Vref4;Vcomp2与Vsaw进行比较之后输出占空比等于50%、频率与锯齿波Vsaw频率一致的脉冲信号Vpulse,进一步经驱动信号发生电路104输出频率可变、占空比接近50%的驱动信号Vg_Q1和Vg_Q2;举例说明电路的调节过程如下:当主电路受到外界影响使得输出电压增加,从而FB信号增加,经PFM控制误差放大环节101使得Vcomp1下降,Vcomp1信号与Vref3之间的差值变大,使得压控电流源VCI的输出电流增加,使得Vsaw频率上升,进一步使得驱动信号频率上升,由图15可知,电路工作频率使得电路增益下降从而使输出电压降低,因此可见,通过控制电路的负反馈作用可以使得电路重新回到稳态。The first case: when the output voltage is low so that the output voltage feedback signal VFB is always lower than the voltage reference Vref2, Vcomp2 is in a constant high state, and due to the effect of the limiter LIMV, Vcomp2 is clamped at Vref4/2; PFM control error The amplifying link 101 plays a role of circuit regulation, outputting the Vcomp1 signal affected by the working condition of the circuit, the difference between the Vcomp1 signal and Vref3 changes the output current of the voltage-controlled current source VCI, thereby adjusting the frequency of the sawtooth wave Vsaw, and the sawtooth wave Vsaw The peak value of Vsaw is equal to Vref4; after Vcomp2 is compared with Vsaw, the output duty ratio is equal to 50%, and the pulse signal Vpulse whose frequency is consistent with the frequency of the sawtooth wave Vsaw is further output by the driving signal generating circuit 104. The frequency is variable and the duty ratio is close to 50%. drive signals V g_Q1 and V g_Q2 ; the adjustment process of the circuit is illustrated as follows: when the main circuit is affected by the outside world, the output voltage increases, so that the FB signal increases, and the PFM control error amplification link 101 makes Vcomp1 decrease, and the Vcomp1 signal and Vref3 The larger the difference, the higher the output current of the voltage-controlled current source VCI, the higher the frequency of Vsaw, and the higher frequency of the driving signal. It can be seen from Figure 15 that the operating frequency of the circuit reduces the gain of the circuit and reduces the output voltage. Therefore, it can be seen that through The negative feedback effect of the control circuit can make the circuit return to the steady state.

第二种情况:当输出电压较高使得主电路反馈信号FB恒高于电压基准Vref1,因此Vcomp1处于恒低状态,输出电压反馈信号VFB达到电压基准Vref2,PWM控制误差放大环节102起到电路调节作用,输出幅值可调的误差放大信号Vcomp2。电压基准Vref3与Vcomp1的差值为定值,因此锯齿波Vsaw的频率为定值且峰值等于Vref2;Vcomp2与Vsaw进行比较后输出占空比可调、频率与锯齿波Vsaw一致的脉冲信号Vpulse,进一步经驱动信号发生电路104输出占空比可调的驱动信号Vg_Q1和Vg_Q2。举例说明电路的调节过程如下:当主电路受到外界影响使得输出电压增加,从而VFB信号增加,经PWM控制误差放大环节102使得Vcomp2下降,从而使得脉冲信号Vpulse占空比下降,进一步使得驱动信号Vg_Q1占空比下降、Vg_Q2占空比上升;因此开关管S1导通时间减小使得电感L1在每个开关周期传递的能量减小,从而使输出电压降低。因此可见,通过控制电路的负反馈作用可以使得电路重新回到稳态。The second situation: when the output voltage is high, the main circuit feedback signal FB is always higher than the voltage reference Vref1, so Vcomp1 is in a constant low state, the output voltage feedback signal VFB reaches the voltage reference Vref2, and the PWM control error amplification link 102 functions as a circuit regulator. Function, output the error amplification signal Vcomp2 with adjustable amplitude. The difference between the voltage reference Vref3 and Vcomp1 is a constant value, so the frequency of the sawtooth wave Vsaw is a constant value and the peak value is equal to Vref2; Vcomp2 is compared with Vsaw to output a pulse signal Vpulse with an adjustable duty cycle and a frequency consistent with the sawtooth wave Vsaw. The driving signals V g_Q1 and V g_Q2 with adjustable duty ratio are further outputted through the driving signal generating circuit 104 . An example to illustrate the adjustment process of the circuit is as follows: when the main circuit is affected by the outside world, the output voltage increases, so that the VFB signal increases, and the PWM control error amplification link 102 causes Vcomp2 to decrease, thereby reducing the duty cycle of the pulse signal Vpulse, and further making the drive signal Vg_Q1 occupy The duty ratio of Vg_Q2 decreases and the duty ratio of Vg_Q2 increases; therefore, the on-time of the switch tube S1 decreases, so that the energy transferred by the inductor L1 in each switching cycle decreases, thereby reducing the output voltage. Therefore, it can be seen that the negative feedback of the control circuit can make the circuit return to a steady state.

图18示出本实用新型的软开关高功率因数交流-直流变换器的的第一具体实施例,其中负载为半桥LLC谐振直流-直流变换电路;本领域技术人员不难知道,负载也可以为其它类型的直流-直流变换电路。Fig. 18 shows the first specific embodiment of the soft-switching high power factor AC-DC converter of the present invention, wherein the load is a half-bridge LLC resonant DC-DC conversion circuit; it is not difficult for those skilled in the art to know that the load can also be For other types of DC-DC conversion circuits.

图19示出本实用新型的软开关高功率因数交流-直流变换器的的第二具体实施例,其中负载为半桥LLC谐振直流-直流变换电路,所述半桥LLC谐振直流-直流变换电路的开关管与软开关高功率因数校正电路的开关管复用。所述半桥LLC谐振直流-直流变换电路还包括谐振电感Lr、谐振电容Cr、变压器T2、输出整流电路201、输出电容Co;谐振电感Lr的一端接开关管Q1的源极和开关管Q2的漏极,谐振电感Lr的另一端接谐振电容Cr的一端,谐振电容Cr的另一端接变压器T2原边绕组的一端,变压器T2原边绕组的另一端接参考地,变压器T2的副边绕组接输出整流器201的输入端,输出整流器201的输出端接输出电容Co;Fig. 19 shows the second specific embodiment of the soft-switching high power factor AC-DC converter of the present invention, wherein the load is a half-bridge LLC resonant DC-DC conversion circuit, and the half-bridge LLC resonant DC-DC conversion circuit The switching tube of the soft switching high power factor correction circuit is multiplexed. The half-bridge LLC resonant DC-DC conversion circuit also includes a resonant inductor Lr, a resonant capacitor Cr, a transformer T2, an output rectifier circuit 201, and an output capacitor Co; one end of the resonant inductor Lr is connected to the source of the switch tube Q1 and the switch tube Q2. Drain, the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T2, the other end of the primary winding of the transformer T2 is connected to the reference ground, and the secondary winding of the transformer T2 is connected to Output the input terminal of the rectifier 201, the output terminal of the output rectifier 201 is connected to the output capacitor Co;

图19所示的本实用新型的具体实施例由于软开关高功率因数校正电路与直流-直流变换电路共用开关桥臂,因此其本质上是一种准单级的交流-直流变换器,相对传统两级结构的交流-直流变换器元器件数量减小,而且可以直接采用如图16所示的PFM+PWM控制电路或PFM控制电路,无需增加额外的控制电路。进一步,与传统的boost电路+LLC直流-直流电路构成的准单级交流-直流变换器相比,由于电容C1的分压作用降低了软开关高功率因数校正电路的电压增益,图19所示的本实用新型具体实施例可以在内获得更低的直流母线电压(VCB),降低了开关管的电压应力,因此可是用于90V~265V交流输入范围,传统的boost电路+LLC直流-直流电路构成的准单级交流-直流变换器一般只能应用于低输入电压场合。The specific embodiment of the utility model shown in Figure 19 is essentially a quasi-single-stage AC-DC converter because the soft-switching high power factor correction circuit and the DC-DC conversion circuit share the switch bridge arm, which is relatively traditional The number of components of the two-stage AC-DC converter is reduced, and the PFM+PWM control circuit or PFM control circuit shown in Figure 16 can be directly used without adding additional control circuits. Furthermore, compared with the quasi-single-stage AC-DC converter composed of the traditional boost circuit + LLC DC-DC circuit, the voltage gain of the soft-switching high power factor correction circuit is reduced due to the voltage division effect of the capacitor C1, as shown in Figure 19 The specific embodiment of the utility model can obtain a lower DC bus voltage (V CB ), which reduces the voltage stress of the switch tube, so it can be used in the 90V-265V AC input range, and the traditional boost circuit + LLC DC-DC The quasi-single-stage AC-DC converter formed by the circuit can generally only be applied to low input voltage occasions.

图20示出本实用新型的软开关高功率因数交流-直流变换器的第三具体实施例,其中负载为半桥反激电路。所述半桥反激电路的开关管与软开关高功率因数校正电路的开关管复用。所述半桥反激电路还包括隔直电容Cx、变压器T3、输出整流管Do、输出电容Co;隔直电容Cx的一端接开关管Q1的源极和开关管Q2的漏极,隔直电容Cx的另一端接变压器T3原边绕组的同名端,变压器T3原边绕组的异名端接参考地,变压器T3的副边绕组异名端接输出整流管Do的输入端,输出整流管Do的输出端接输出电容Co的正端,输出电容Co的负端接变压器T3副边绕组的同名端;Fig. 20 shows the third specific embodiment of the soft-switching high power factor AC-DC converter of the present invention, wherein the load is a half-bridge flyback circuit. The switching tube of the half-bridge flyback circuit is multiplexed with the switching tube of the soft-switching high power factor correction circuit. The half-bridge flyback circuit also includes a DC blocking capacitor Cx, a transformer T3, an output rectifier Do, and an output capacitor Co; one end of the DC blocking capacitor Cx is connected to the source of the switching tube Q1 and the drain of the switching tube Q2, and the DC blocking capacitor The other end of Cx is connected to the same-named end of the primary winding of transformer T3, the opposite-named end of the primary winding of transformer T3 is connected to the reference ground, the opposite-named end of the secondary winding of transformer T3 is connected to the input end of the output rectifier Do, and the output rectifier Do The output terminal is connected to the positive terminal of the output capacitor Co, and the negative terminal of the output capacitor Co is connected to the terminal with the same name of the secondary winding of the transformer T3;

类似的,图20示出本实用新型的具体实施例也为一种准单级交流-直流变换器,同样可以获得较低的直流母线电压(VCB)。Similarly, FIG. 20 shows that the specific embodiment of the present invention is also a quasi-single-stage AC-DC converter, which can also obtain a lower DC bus voltage (V CB ).

图21示出本实用新型的软开关高功率因数交流-直流变换器的第四具体实施例,其中负载为半桥LLC谐振直流-直流变换电路,其开关管与软开关高功率因数校正电路的开关管复用。图21所示本实用新型具体实施例与图19具体实施例仅在连接方式上有所区别,在功能上实质等效,因此不再详述。Fig. 21 shows the fourth specific embodiment of the soft-switching high power factor AC-DC converter of the present invention, wherein the load is a half-bridge LLC resonant DC-DC conversion circuit, the switch tube and the soft-switching high power factor correction circuit The switching tube is multiplexed. The specific embodiment of the utility model shown in FIG. 21 is only different from the specific embodiment in FIG. 19 in the connection mode, and is substantially equivalent in function, so it will not be described in detail.

类似的,图21所示具体实施例的负载也可以为半桥反激电路,构成与图20所示具体实施例实质等效的电路结构。Similarly, the load of the specific embodiment shown in FIG. 21 may also be a half-bridge flyback circuit, forming a circuit structure substantially equivalent to that of the specific embodiment shown in FIG. 20 .

本实用新型的软开关高功率因数交流-直流变换器中的整流管D1、整流管D2和续流管D3、续流管D4可以是二极管,也可以部分或全部用MOSFET替代,以降低通态损耗。图22示出了本实用新型的软开关高功率因数交流-直流变换器整流管D1、整流管D2和续流管D3、续流管D4全部采用MOSFET的一个具体实施例。The rectifier tube D1, the rectifier tube D2, the freewheel tube D3 and the freewheel tube D4 in the soft-switching high power factor AC-DC converter of the present utility model can be diodes, and can also be partially or completely replaced by MOSFETs to reduce the on-state loss. Fig. 22 shows a specific embodiment in which the rectifier tube D1, rectifier tube D2, freewheeling tube D3, and freewheeling tube D4 of the soft-switching high power factor AC-DC converter of the present invention all use MOSFETs.

本实用新型包括的具体模块本领域技术人员可以在不违背其精神的前提下,可以有多种实施方式,或通过各种不同的组合方式,形成不同的具体实施例,这里不再详细描述。The specific modules included in the present invention can be implemented in various ways by those skilled in the art without violating its spirit, or can be combined in various ways to form different specific embodiments, which will not be described in detail here.

无论上文说明如何详细,还有可以有许多方式实施本实用新型,说明书中所述的只是本实用新型的一些具体实施例子。凡根据本实用新型精神实质所做的等效变换或修饰,都应涵盖在本实用新型的保护范围之内。No matter how detailed the above description is, there are many ways to implement the utility model, and what is described in the description is only some specific implementation examples of the utility model. All equivalent transformations or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

本实用新型实施例的上述详细说明并不是穷举的或者用于将本实用新型限制在上述明确的形式上。在上述以示意性目的说明本实用新型的特定实施例和实例的同时,本领域技术人员将认识到可以在本实用新型的范围内进行各种等同修改。The above detailed descriptions of the embodiments of the present invention are not intended to be exhaustive or to limit the present invention to the above-mentioned specific forms. While specific embodiments of, and examples for, the invention are described above for illustrative purposes, various equivalent modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize.

在上述说明描述了本实用新型的特定实施例并且描述了预期最佳模式的同时,无论在上文中出现了如何详细的说明,也可以许多方式实施本实用新型。上述电路结构及其控制方式的细节在其执行细节中可以进行相当多的变化,然而其仍然包含在这里所公开的本实用新型中。While the above description describes certain embodiments of the invention and describes the best mode contemplated, no matter how detailed the above description appears, the invention can be practiced in many ways. The details of the above-mentioned circuit structure and its control method can be changed quite a lot in its implementation details, but it is still included in the utility model disclosed here.

如上述一样应当注意,在说明本实用新型的某些特征或者方案时所使用的特殊术语不应当用于表示在这里重新定义该术语以限制与该术语相关的本实用新型的某些特定特点、特征或者方案。总之,不应当将在随附的权利要求书中使用的术语解释为将本实用新型限定在说明书中公开的特定实施例,除非上述详细说明部分明确地限定了这些术语。因此,本实用新型的实际范围不仅包括所公开的实施例,还包括在权利要求书之下实施或者执行本实用新型的所有等效方案。As mentioned above, it should be noted that the special terms used when describing some features or solutions of the present utility model should not be used to indicate that the term is redefined here to limit some specific features of the utility model related to the term, features or schemes. In conclusion, the terms used in the following claims should not be construed to limit the invention to the particular embodiments disclosed in the specification, unless the above detailed description expressly defines those terms. Accordingly, the actual scope of the invention includes not only the disclosed embodiments, but also all equivalents of implementing or implementing the invention under the claims.

Claims (8)

1.软开关高功率因数交流-直流变换器,其特征在于:所述软开关高功率因数交流-直流变换器包括软开关功率因数校正电路,其中1. Soft-switching high power factor AC-DC converter, characterized in that: the soft-switching high power factor AC-DC converter includes a soft-switching power factor correction circuit, wherein 所述软开关功率因数校正电路包括:滤波器、整流管D1、整流管D2、续流管D3、续流管D4、电感L1、电容C1、开关管Q1、开关管Q2、电容CB;The soft switching power factor correction circuit includes: a filter, a rectifier tube D1, a rectifier tube D2, a freewheel tube D3, a freewheel tube D4, an inductor L1, a capacitor C1, a switch tube Q1, a switch tube Q2, and a capacitor CB; 其中,滤波器的一个输入端接交流源Vac的一端,其另一输入端交流源Vac的另一端,滤波器的一个输出端接整流管D1的阳极和整流管D2的阴极,滤波器的一个输出端接接续流管D3的阳极和续流管D4的阴极,整流管D1的阴极接续流管D3的阴极、开关管Q1的漏极以及电容CB的正端,整流管D2的阳极接续流管D4的阳极、开关管Q2的源极、电容CB的负端以及参考地,续流管D3的阳极接电感L1的一端,电感L1的另一端接电容C1的一端,电容C1的另一端接开关管Q1的源极以及开关管Q2的漏极,开关管Q1和开关管Q2的栅极分别与控制电路输出信号端连接。Among them, one input terminal of the filter is connected to one end of the AC source Vac, the other input terminal of the filter is connected to the other end of the AC source Vac, one output terminal of the filter is connected to the anode of the rectifier tube D1 and the cathode of the rectifier tube D2, one of the filter The output terminal is connected to the anode of the freewheeling tube D3 and the cathode of the freewheeling tube D4, the cathode of the rectifier tube D1 is connected to the cathode of the freewheeling tube D3, the drain of the switching tube Q1 and the positive terminal of the capacitor CB, and the anode of the rectifier tube D2 is connected to the freewheeling tube The anode of D4, the source of the switching tube Q2, the negative terminal of the capacitor CB and the reference ground, the anode of the freewheeling tube D3 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the switch The source of the transistor Q1, the drain of the switching transistor Q2, and the gates of the switching transistor Q1 and the switching transistor Q2 are respectively connected to the output signal terminal of the control circuit. 2.根据权利要求1所述的软开关高功率因数交流-直流变换器,其特征在于:2. The soft-switching high power factor AC-DC converter according to claim 1, characterized in that: 还包括一个负载,所述负载接电容CB的正端和负端之间,负载为电阻、LED、蓄电池或直流-直流变换电路。A load is also included, the load is connected between the positive terminal and the negative terminal of the capacitor CB, and the load is a resistor, an LED, a storage battery or a DC-DC conversion circuit. 3.根据权利要求1所述的软开关高功率因数交流-直流变换器,其特征在于:3. The soft-switching high power factor AC-DC converter according to claim 1, characterized in that: 还包括一个负载,所述负载接开关管Q1和开关管Q2构成的开关桥臂中点与电容CB的负端之间,负载为电阻或直流-直流变换电路。A load is also included, the load is connected between the midpoint of the switching bridge arm formed by the switching tube Q1 and the switching tube Q2 and the negative terminal of the capacitor CB, and the load is a resistance or a DC-DC conversion circuit. 4.根据权利要求1所述的软开关高功率因数交流-直流变换器,其特征在于:4. The soft-switching high power factor AC-DC converter according to claim 1, characterized in that: 还包括一个负载,所述负载接开关管Q1和开关管Q2构成的开关桥臂中点与构成电容CB的两个串联电容的中点之间,负载为电阻或直流-直流变换电路。It also includes a load, the load is connected between the midpoint of the switching bridge arm formed by the switching tube Q1 and the switching tube Q2 and the midpoint of the two series capacitors forming the capacitor CB, and the load is a resistor or a DC-DC conversion circuit. 5.根据权利要求3所述的软开关高功率因数交流-直流变换器,其特征在于:5. The soft-switching high power factor AC-DC converter according to claim 3, characterized in that: 所述的负载为半桥LLC谐振直流-直流变换电路;所述半桥LLC谐振直流-直流变换电路的开关管与软开关高功率因数校正电路的开关管复用,所述半桥LLC谐振直流-直流变换电路还包括谐振电感Lr、谐振电容Cr、变压器T2、输出整流电路、输出电容Co;谐振电感Lr的一端接开关管Q1的源极和开关管Q2的漏极,谐振电感Lr的另一端接谐振电容Cr的一端,谐振电容Cr的另一端接变压器T2原边绕组的一端,变压器T2原边绕组的另一端接参考地,变压器T2的副边绕组接输出整流器的输入端,输出整流器的输出端接输出电容Co。The load is a half-bridge LLC resonant DC-DC conversion circuit; the switch tube of the half-bridge LLC resonant DC-DC conversion circuit is multiplexed with the switch tube of the soft-switching high power factor correction circuit, and the half-bridge LLC resonant DC - The DC conversion circuit also includes a resonant inductor Lr, a resonant capacitor Cr, a transformer T2, an output rectifier circuit, and an output capacitor Co; one end of the resonant inductor Lr is connected to the source of the switching tube Q1 and the drain of the switching tube Q2, and the other end of the resonant inductor Lr One end is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T2, the other end of the primary winding of the transformer T2 is connected to the reference ground, the secondary winding of the transformer T2 is connected to the input end of the output rectifier, and the output rectifier The output terminal is connected to the output capacitor Co. 6.根据权利要求3所述的软开关高功率因数交流-直流变换器,其特征在于:6. The soft-switching high power factor AC-DC converter according to claim 3, characterized in that: 所述的负载为半桥反激电路;所述半桥反激电路的开关管与软开关高功率因数校正电路的开关管复用;所述半桥反激电路还包括隔直电容Cx、变压器T3、输出整流管Do、输出电容Co;隔直电容Cx的一端接开关管Q1的源极和开关管Q2的漏极,隔直电容Cx的另一端接变压器T3原边绕组的同名端,变压器T3原边绕组的异名端接参考地,变压器T3的副边绕组异名端接输出整流器Do的输入端,输出整流器Do的输出端接输出电容Co的正端,输出电容Co的负端接变压器T3副边绕组的同名端。The load is a half-bridge flyback circuit; the switch tube of the half-bridge flyback circuit is multiplexed with the switch tube of the soft-switching high power factor correction circuit; the half-bridge flyback circuit also includes a DC blocking capacitor Cx, a transformer T3, output rectifier tube Do, output capacitor Co; one end of the DC blocking capacitor Cx is connected to the source of the switch tube Q1 and the drain of the switch tube Q2, and the other end of the DC blocking capacitor Cx is connected to the same name end of the primary winding of the transformer T3, the transformer The different-name terminal of the primary winding of T3 is connected to the reference ground, the different-name terminal of the secondary winding of the transformer T3 is connected to the input terminal of the output rectifier Do, the output terminal of the output rectifier Do is connected to the positive terminal of the output capacitor Co, and the negative terminal of the output capacitor Co is connected to Terminal with the same name of the secondary winding of transformer T3. 7.根据权利要求1所述的软开关高功率因数交流-直流变换器,其特征在于:7. The soft-switching high power factor AC-DC converter according to claim 1, characterized in that: 所述软开关高功率因数交流-直流变换器中的整流管D1、整流管D2和续流管D3、续流管D4是二极管。The rectifier D1, rectifier D2, freewheel D3 and freewheel D4 in the soft-switching high power factor AC-DC converter are diodes. 8.根据权利要求1所述的软开关高功率因数交流-直流变换器,其特征在于:8. The soft-switching high power factor AC-DC converter according to claim 1, characterized in that: 所述软开关高功率因数交流-直流变换器中的整流管D1、整流管D2和续流管D3、续流管D4部分或全部是MOSFET。Part or all of the rectifier tube D1, rectifier tube D2, freewheel tube D3, and freewheel tube D4 in the soft-switching high power factor AC-DC converter are MOSFETs.
CN201821774471.8U 2018-10-23 2018-10-23 Soft Switching High Power Factor AC-DC Converter Active CN209593312U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109217699A (en) * 2018-10-23 2019-01-15 杭州电子科技大学 A kind of Sofe Switch High Power Factor A.C.-D.C. converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109217699A (en) * 2018-10-23 2019-01-15 杭州电子科技大学 A kind of Sofe Switch High Power Factor A.C.-D.C. converter
CN109217699B (en) * 2018-10-23 2024-02-02 杭州电子科技大学 Soft-switching high-power-factor alternating current-direct current converter

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