CN109921640A - AC/DC converter based on crisscross parallel Boost circuit - Google Patents

AC/DC converter based on crisscross parallel Boost circuit Download PDF

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Publication number
CN109921640A
CN109921640A CN201910208017.9A CN201910208017A CN109921640A CN 109921640 A CN109921640 A CN 109921640A CN 201910208017 A CN201910208017 A CN 201910208017A CN 109921640 A CN109921640 A CN 109921640A
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China
Prior art keywords
diode
boost circuit
capacitor
switching tube
converter
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CN201910208017.9A
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Chinese (zh)
Inventor
管乐诗
王懿杰
李方
张相军
徐殿国
王卫
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN201910208017.9A priority Critical patent/CN109921640A/en
Publication of CN109921640A publication Critical patent/CN109921640A/en
Pending legal-status Critical Current

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Abstract

AC/DC converter based on crisscross parallel Boost circuit belongs to AC/DC converter technique field, solves the problems, such as that the stresses of parts of the existing AC/DC converter based on critical conduction mode Boost circuit is big.The AC/DC converter: the ac voltage signal that AC power source exports is converted to d. c. voltage signal by rectification unit.The d. c. voltage signal that first filter unit exports rectification unit is filtered.First Boost circuit and the second Boost circuit constitute the crisscross parallel Boost circuit for sharing inductance, and work alternatively in critical conduction mode.The voltage input side and voltage output side of crisscross parallel Boost circuit are cascaded with the voltage output side of the first filter unit and the voltage input side of the second filter unit respectively.It loads in parallel with the second filter unit.The input voltage of two Boost circuits is equal to the half of system input voltage.

Description

AC/DC converter based on crisscross parallel Boost circuit
Technical field
The present invention relates to a kind of AC/DC converters, belong to AC/DC converter technique field.
Background technique
Existing power factor correction technology is broadly divided into two classes: passive power factor correction technology and active power factor Alignment technique.
Passive power factor correction technology usually in ac output end using LC filter method and shunt capacitor method come real The correction of existing power factor.However, passive power factor correction technology is typically only capable to the power factor of realization 0.7~0.8, it is right The inhibitory effect of harmonic current is unsatisfactory, and current harmonic content is difficult to meet existing international standard and state 40% or so Family's standard.Therefore, the application range of passive power factor correction technology is more and more narrow, is just gradually eliminated.
Active Power Factor Correction Technology is typically employed in the mode that AC/DC converter is accessed between rectifier and inverter To realize the correction of power factor.Existing AC/DC converter is based primarily upon Boost circuit to realize, and existing Boost circuit Operating mode be broadly divided into three classes: continuous conduction mode (CCM), discontinuous conduction mode (DCM) and critical conduction mode (CRM)。
For the Boost circuit of continuous conduction mode, diode the phenomenon that there are Reverse recoveries, control is complicated.It is right For the Boost circuit of discontinuous conduction mode, current ripples and voltage ripple are larger, and stresses of parts is big, and switching loss is big. For the Boost circuit of critical conduction mode, inductive current between it is continuous and discontinuously between, there is no diode it is reversely extensive Multiple phenomenon, stresses of parts is small, and average current input and input voltage are in preferable linear relationship.Therefore, it is based on critical conduction The AC/DC converter of Mode B oost circuit is widely used in active power factor correction at present.
However, under the higher occasion of input voltage, the AC/DC converter of existing critical conduction mode Boost circuit Busbar voltage is also higher, so that the voltage stress of switching tube and other devices is larger.
Summary of the invention
The present invention be solve the existing AC/DC converter based on critical conduction mode Boost circuit stresses of parts it is big Problem proposes a kind of AC/DC converter based on crisscross parallel Boost circuit.
AC/DC converter of the present invention based on crisscross parallel Boost circuit includes rectification unit, the first filtering list Member, the first Boost circuit, the second Boost circuit and the second filter unit;
Rectification unit is used to the ac voltage signal that AC power source exports being converted to d. c. voltage signal;
The d. c. voltage signal that first filter unit is used to export rectification unit is filtered;
First Boost circuit includes capacitor C1, diode D1, switching tube S1With inductance Lb, the second Boost circuit includes electricity Hold C2, diode D2, switching tube S2With inductance Lb, switching tube S1With switching tube S2It is respectively provided with body diode Ds1And body diode Ds2, the first Boost circuit and the second Boost circuit share inductance Lb
Capacitor C1First end and diode D1Anode be connected, diode D1Cathode and switching tube S1Electric current flow into end It is connected, switching tube S1Electric current outflow end simultaneously with inductance LbFirst end and switching tube S2Electric current flow into end be connected, inductance Lb Second end simultaneously with capacitor C1Second end and capacitor C2First end be connected, switching tube S2Electric current outflow end and diode D2Anode be connected, diode D2Cathode and capacitor C2Second end be connected;
Capacitor C1With diode D1Common end and capacitor C2With diode D2Common end respectively with the first filter unit Two output ends are connected, diode D1With switching tube S1Common end and diode D2With switching tube S2Common end respectively with Two input terminals of two filter units are connected;
It loads in parallel with the second filter unit;
First Boost circuit and the second Boost circuit constitute crisscross parallel Boost circuit, and work alternatively and lead in critical Logical mode.
As preferably, rectification unit is bridge rectifier.
As preferably, rectification unit includes diode D3~diode D6
Diode D3Anode and diode D4Cathode be connected, diode D3Cathode and diode D5Cathode be connected, Diode D4Anode and diode D6Anode be connected, diode D5Anode and diode D6Cathode be connected;
Diode D3With diode D4Common end and diode D5With diode D6Common end respectively with AC power source Two output ends are connected;
Diode D3With diode D5Common end and diode D4With diode D6Common end be rectification unit first Output end and second output terminal.
As preferably, the first filter unit is capacitor Cin
Capacitor CinFirst end the first output end and capacitor C with rectification unit simultaneously1With diode D1Common end It is connected, capacitor CinSecond end second output terminal and capacitor C with rectification unit simultaneously2With diode D2Common end phase Even.
As preferably, the second filter unit is capacitor Co
Diode D1With switching tube S1Common end and capacitor CoFirst end be connected, diode D2With switching tube S2It is public End and capacitor CoSecond end be connected.
As preferably, switching tube S1With switching tube S2The field-effect tube for being all made of STF11NM60ND model is realized.
As preferably, diode D1With diode D2The diode for being all made of SCS210KGHR model is realized.
As preferably, inductance LbInductance value determination process are as follows:
Within a duty cycle of crisscross parallel Boost circuit, inductance LbPeak point current be expressed as:
In formula, IpkFor inductance LbPeak point current, TSFor a duty cycle of crisscross parallel Boost circuit, VinTo be System input voltage, VBFor system output voltage;
Input current indicates are as follows:
In formula, iinFor input current, iLbFor inductance LbElectric current,Vin=VpSin ω t, VpFor System input voltage peak value;
System input power indicates are as follows:
In formula, PinFor system input power,
System input power indicates are as follows:
Pin=Po/η (4)
In formula, PoFor system output power, η is system effectiveness;
Formula (1)~formula (4) simultaneous can be obtained:
AC/DC converter of the present invention based on crisscross parallel Boost circuit, the first Boost circuit and second The input voltage of Boost circuit is equal to the half of system input voltage.Therefore, and existing under the higher occasion of input voltage There is the AC/DC converter of critical conduction mode Boost circuit to compare, it is of the present invention based on crisscross parallel Boost circuit The busbar voltage of AC/DC converter is lower, and device voltage stress is also smaller.In addition to this, crisscross parallel Boost electricity of the invention Road works in pressure critical conduction mode, control mode very simple, it is easy to accomplish, cost is relatively low.
Detailed description of the invention
It will hereinafter come based on the embodiments and with reference to the accompanying drawings to of the present invention based on crisscross parallel Boost circuit AC/DC converter is described in more detail, in which:
Fig. 1 is the circuit diagram of the AC/DC converter based on crisscross parallel Boost circuit described in embodiment, wherein VinFor AC power source, RLFor load;
Fig. 2 is the first operation mode figure of the crisscross parallel Boost circuit that embodiment refers to;
Fig. 3 is the second operation mode figure of the crisscross parallel Boost circuit that embodiment refers to;
Fig. 4 is the third operation mode figure for the crisscross parallel Boost circuit that embodiment refers to;
Fig. 5 is the 4th operation mode figure of the crisscross parallel Boost circuit that embodiment refers to;
Fig. 6 is the inductance L that embodiment refers tobVoltage signal and current signal waveform figure;
Fig. 7 is the system power factor change curve that embodiment refers to;
Fig. 8 is the system total harmonic distortion variation diagram that embodiment refers to.
Specific embodiment
The AC/DC converter of the present invention based on crisscross parallel Boost circuit is made into one below in conjunction with attached drawing Walk explanation.
Embodiment: the present embodiment is explained in detail below with reference to FIG. 1 to FIG. 8.
AC/DC converter described in the present embodiment based on crisscross parallel Boost circuit includes rectification unit, the first filtering Unit, the first Boost circuit, the second Boost circuit and the second filter unit;
Rectification unit is used to the ac voltage signal that AC power source exports being converted to d. c. voltage signal;
The d. c. voltage signal that first filter unit is used to export rectification unit is filtered;
First Boost circuit includes capacitor C1, diode D1, switching tube S1With inductance Lb, the second Boost circuit includes electricity Hold C2, diode D2, switching tube S2With inductance Lb, switching tube S1With switching tube S2It is respectively provided with body diode Ds1And body diode Ds2, the first Boost circuit and the second Boost circuit share inductance Lb
Capacitor C1First end and diode D1Anode be connected, diode D1Cathode and switching tube S1Electric current flow into end It is connected, switching tube S1Electric current outflow end simultaneously with inductance LbFirst end and switching tube S2Electric current flow into end be connected, inductance Lb Second end simultaneously with capacitor C1Second end and capacitor C2First end be connected, switching tube S2Electric current outflow end and diode D2Anode be connected, diode D2Cathode and capacitor C2Second end be connected;
Capacitor C1With diode D1Common end and capacitor C2With diode D2Common end respectively with the first filter unit Two output ends are connected, diode D1With switching tube S1Common end and diode D2With switching tube S2Common end respectively with Two input terminals of two filter units are connected;
It loads in parallel with the second filter unit;
First Boost circuit and the second Boost circuit constitute crisscross parallel Boost circuit, and work alternatively and lead in critical Logical mode.
The rectification unit of the present embodiment is bridge rectifier.
The rectification unit of the present embodiment includes diode D3~diode D6
Diode D3Anode and diode D4Cathode be connected, diode D3Cathode and diode D5Cathode be connected, Diode D4Anode and diode D6Anode be connected, diode D5Anode and diode D6Cathode be connected;
Diode D3With diode D4Common end and diode D5With diode D6Common end respectively with AC power source Two output ends are connected;
Diode D3With diode D5Common end and diode D4With diode D6Common end be rectification unit first Output end and second output terminal.
First filter unit of the present embodiment is capacitor Cin
Capacitor CinFirst end the first output end and capacitor C with rectification unit simultaneously1With diode D1Common end It is connected, capacitor CinSecond end second output terminal and capacitor C with rectification unit simultaneously2With diode D2Common end phase Even.
Second filter unit of the present embodiment is capacitor Co
Diode D1With switching tube S1Common end and capacitor CoFirst end be connected, diode D2With switching tube S2It is public End and capacitor CoSecond end be connected.
The switching tube S of the present embodiment1With switching tube S2The field-effect tube for being all made of STF11NM60ND model is realized.
The diode D of the present embodiment1With diode D2The diode for being all made of SCS210KGHR model is realized.
The following detailed description of four kinds of operation modes of the crisscross parallel Boost circuit that the present embodiment proposes:
First operation mode (t0-t1): as shown in Figure 2, wherein Vin1And Vin2The input electricity of respectively the first Boost circuit The input voltage of pressure and the second Boost circuit, Vin1=Vin2=Vin/2.In t0Before, switching tube S2Shutdown, inductive current iLbIt is logical Cross diode D2With body diode Ds1Afterflow.In t0When, inductive current iLbReach 0, leads to diode D2With body diode Ds1It closes It is disconnected.As body diode Ds1When conducting, switching tube S1Driving signal be already applied to its gate pole, switching tube S1Realize that no-voltage is opened Logical (ZVS), Vin1It is applied to inductance LbBoth ends, inductive current iLbLinear increase.
Second operation mode (t1-t2): as shown in Figure 3.In t1Moment, switching tube S1Shutdown, positive inductive current iLbCompel Make body diode Ds2Open negative voltage VB-Vin1, and it is applied to inductance LbBoth ends, inductive current iLbIt is linear to reduce, in t2When When quarter, inductive current iLbIt is reduced to 0, the second operation mode terminates.
Third operation mode (t2-t3): as shown in Figure 4.In t2Moment, inductive current iLbReach 0, leads to body diode Ds2 With diode D1Shutdown.As body diode Ds2When conducting, switching tube S2Driving signal be already applied to its gate pole, switching tube S2 Realize that no-voltage opens (ZVS), Vin2It is applied to inductance LbBoth ends, inductive current iLbReverse linear increases.
4th operation mode (t3-t4): as shown in Figure 5.In t3Moment, switching tube S2Shutdown, due to inductive current iLbStill It is negative, body diode Ds1With diode D2Conducting, voltage VB-Vin2It is applied to inductance LbBoth ends, inductive current iLbReverse linear It reduces.In t4Moment, inductive current iLbWhen being reduced to 0, the 4th operation mode terminates.One new duty cycle restarts.
The following detailed description of the parameter designing process for the crisscross parallel Boost circuit that the present embodiment proposes:
Fig. 6 is inductance LbVoltage signal and current signal waveform figure, wherein vLbFor inductive drop, ILmFor inductive current Maximum value, τ=t2-t1
As can be seen from FIG. 6, within a duty cycle of crisscross parallel Boost circuit, inductance LbPeak point current indicate Are as follows:
In formula, IpkFor inductance LbPeak point current, TSFor a duty cycle of crisscross parallel Boost circuit, VinTo be System input voltage, VBFor system output voltage;
DC bus current is equal to the half of inductive current, due to input filter and rectification, instantaneous DC bus current etc. Mean direct bus current within a duty cycle, input current indicate are as follows:
In formula, iinFor input current, iLbFor inductance LbElectric current,Vin=VpSin ω t, VpFor System input voltage peak value;
System input power indicates are as follows:
In formula, PinFor system input power,
System input power indicates are as follows:
Pin=Po/η (4)
In formula, PoFor system output power, η is system effectiveness;
Formula (1)~formula (4) simultaneous can be obtained:
System power factor can be acquired by the ratio between system input power and system apparent energy, be indicated are as follows:
In formula, PF is system power factor, VrmsFor system input ac voltage virtual value, IrmsFor system input AC electricity Virtual value is flowed, Z is system total impedance,
System total harmonic distortion indicates are as follows:
In formula, THD is system total harmonic distortion.
Fig. 7 and Fig. 8 is respectively system power factor change curve and system total harmonic distortion variation diagram.According to Fig. 7 and Fig. 8 it is found that the present embodiment propose crisscross parallel Boost circuit power factor with higher and lesser aberration rate, can Effectively act as the effect of PFC.
The experimental results showed that the AC/DC under rated condition, based on crisscross parallel Boost circuit described in the present embodiment The power factor of converter reaches 97.4%, and for aberration rate less than 10, design meets IEC-61000-3-2 standard.
Specific example:
The AC/DC converter based on crisscross parallel Boost circuit of design, nominal input voltage 220V, nominal operation Frequency is 200KHz, and output meets pure resistor load, rated output voltage 340V, rated output power 50W.
Go out to participate in the parameter value of the passive element of resonance by given calculation of design parameters first, so that it is determined that main circuit Component parameters.Finally determining device type or parameter are as shown in table 1:
The main devices model or parameter of 1 system of table
Based on the AC/DC converter of crisscross parallel Boost circuit described in the present embodiment, switching tube can be effectively reduced Voltage stress.
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities Applying example only is the example of principles and applications.It should therefore be understood that can be permitted exemplary embodiment More modifications, and can be designed that other arrangements, without departing from spirit of the invention as defined in the appended claims and Range.It should be understood that different appurtenances can be combined by being different from mode described in original claim It is required that and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used at it In his embodiment.

Claims (8)

1. the AC/DC converter based on crisscross parallel Boost circuit, which is characterized in that the AC/DC converter includes that rectification is single Member, the first filter unit, the first Boost circuit, the second Boost circuit and the second filter unit;
Rectification unit is used to the ac voltage signal that AC power source exports being converted to d. c. voltage signal;
The d. c. voltage signal that first filter unit is used to export rectification unit is filtered;
First Boost circuit includes capacitor C1, diode D1, switching tube S1With inductance Lb, the second Boost circuit includes capacitor C2、 Diode D2, switching tube S2With inductance Lb, switching tube S1With switching tube S2It is respectively provided with body diode Ds1With body diode Ds2, the One Boost circuit and the second Boost circuit share inductance Lb
Capacitor C1First end and diode D1Anode be connected, diode D1Cathode and switching tube S1Electric current flow into end be connected, Switching tube S1Electric current outflow end simultaneously with inductance LbFirst end and switching tube S2Electric current flow into end be connected, inductance Lb? Two ends simultaneously with capacitor C1Second end and capacitor C2First end be connected, switching tube S2Electric current outflow end and diode D2's Anode is connected, diode D2Cathode and capacitor C2Second end be connected;
Capacitor C1With diode D1Common end and capacitor C2With diode D2Common end two with the first filter unit respectively Output end is connected, diode D1With switching tube S1Common end and diode D2With switching tube S2Common end respectively with second filter Two input terminals of wave unit are connected;
It loads in parallel with the second filter unit;
First Boost circuit and the second Boost circuit constitute crisscross parallel Boost circuit, and work alternatively in critical conduction mould Formula.
2. as described in claim 1 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that rectification unit For bridge rectifier.
3. as claimed in claim 2 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that rectification unit Including diode D3~diode D6
Diode D3Anode and diode D4Cathode be connected, diode D3Cathode and diode D5Cathode be connected, two poles Pipe D4Anode and diode D6Anode be connected, diode D5Anode and diode D6Cathode be connected;
Diode D3With diode D4Common end and diode D5With diode D6Common end two with AC power source respectively Output end is connected;
Diode D3With diode D5Common end and diode D4With diode D6Common end be rectification unit first output End and second output terminal.
4. as claimed in claim 3 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that the first filtering Unit is capacitor Cin
Capacitor CinFirst end the first output end and capacitor C with rectification unit simultaneously1With diode D1Common end be connected, Capacitor CinSecond end second output terminal and capacitor C with rectification unit simultaneously2With diode D2Common end be connected.
5. as claimed in claim 4 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that the second filtering Unit is capacitor Co
Diode D1With switching tube S1Common end and capacitor CoFirst end be connected, diode D2With switching tube S2Common end and Capacitor CoSecond end be connected.
6. as claimed in claim 5 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that switching tube S1 With switching tube S2The field-effect tube for being all made of STF11NM60ND model is realized.
7. as claimed in claim 6 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that diode D1 With diode D2The diode for being all made of SCS210KGHR model is realized.
8. as claimed in claim 7 based on the AC/DC converter of crisscross parallel Boost circuit, which is characterized in that inductance Lb's The determination process of inductance value are as follows:
Within a duty cycle of crisscross parallel Boost circuit, inductance LbPeak point current be expressed as:
In formula, IpkFor inductance LbPeak point current, TSFor a duty cycle of crisscross parallel Boost circuit, VinIt is defeated for system Enter voltage, VBFor system output voltage;
Input current indicates are as follows:
In formula, iinFor input current, iLbFor inductance LbElectric current,Vin=VpSin ω t, VpFor system Input voltage peak value;
System input power indicates are as follows:
In formula, PinFor system input power,
System input power indicates are as follows:
Pin=Po/η (4)
In formula, PoFor system output power, η is system effectiveness;
Formula (1)~formula (4) simultaneous can be obtained:
CN201910208017.9A 2019-03-19 2019-03-19 AC/DC converter based on crisscross parallel Boost circuit Pending CN109921640A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN108418458A (en) * 2018-03-13 2018-08-17 广东工业大学 A kind of half-bridge inverter based on quasi- Y source impedance networks
CN108736707A (en) * 2018-07-27 2018-11-02 国网辽宁省电力有限公司铁岭供电公司 A kind of BOOST converter with switched inductors structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102804546A (en) * 2010-03-18 2012-11-28 美国能量变换公司 AC-to-DC conversion
CN102751861A (en) * 2011-04-21 2012-10-24 艾默生网络能源系统北美公司 Bridgeless power factor correction circuit
CN108418458A (en) * 2018-03-13 2018-08-17 广东工业大学 A kind of half-bridge inverter based on quasi- Y source impedance networks
CN108736707A (en) * 2018-07-27 2018-11-02 国网辽宁省电力有限公司铁岭供电公司 A kind of BOOST converter with switched inductors structure

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Title
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