CN105703627A - Secondary side single-winding self-resetting forward conversion circuit designing method - Google Patents

Secondary side single-winding self-resetting forward conversion circuit designing method Download PDF

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Publication number
CN105703627A
CN105703627A CN201610286037.4A CN201610286037A CN105703627A CN 105703627 A CN105703627 A CN 105703627A CN 201610286037 A CN201610286037 A CN 201610286037A CN 105703627 A CN105703627 A CN 105703627A
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diode
max
high frequency
frequency transformer
inductance
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CN105703627B (en
Inventor
刘树林
张法旺
韩跃云
周闵阳光
徐惠三
汪倩倩
黄治
郭瑞峰
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Xian University of Science and Technology
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Xian University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

The invention discloses a secondary side single-winding self-resetting forward conversion circuit designing method.The method comprises the following steps that 1, a high-frequency transformer T1, a switching tube Q1, a diode D1, a diode D2, an inductor L1 and a capacitor of proper parameters for forming a forward converter are selected; 2, the high-frequency transformer T1, the switching tube Q1, the diode D1, the diode D2, the capacitor L1 and the capacitor C1 are connected to form a main circuit of the forward converter; 3, a diode D3 and a capacitor C2 of proper parameters for forming an excitation energy storage circuit are selected; 4, the diode D3 and the capacitor C2 are connected to form the excitation energy storage circuit to be connected with the main circuit of the forward converter; 5, a diode D4 and an inductor L2 of proper parameters for forming an excitation energy transferring circuit are selected; 6, the diode D4 and the inductor L2 are connected to form the excitation energy transferring circuit to be connected with the main circuit of the forward converter.The method is simple in steps, reasonable in design and high in practicability.

Description

The method for designing of secondary simplex winding Self-resetting forward conversion circuit
Technical field
The invention belongs to switch power technology field, be specifically related to the method for designing of a kind of secondary simplex winding Self-resetting forward conversion circuit。
Background technology
In numerous switching power circuit topologys, the performance characteristics of many excellences such as forward converter circuit structure is simple, cost is low, input and output electrical isolation, functional reliability are high so that it is be subject to industry extensive concern。Due to the magnetic core of transformer unidirectional magnetiztion of forward converter and itself there is no magnetic reset function, it is possible to cause the problems such as magnetic core is saturated, greatly limit the popularization of forward converter, so magnetic core must be avoided saturated by additional magnetic reset circuit。Currently the kind of exciting converter magnetic reset circuit is more, but major part is required for other circuit additional, is unfavorable for the miniaturization of power module。
Common magnetic reset mode specifically includes that RCD circuit magnetic reset, reset winding magnetic reset, LCD resonant magnetic reset, active clamp etc., its dominant mechanism is switching tube to be closed the magnetization energy having no progeny on transformator return to input power, or by these energy expenditures on resistance or other energy dissipation devices。RCD clamp technology has the advantages such as circuit is simple, its deficiency be by magnetization energy consumption in clamp resistance, reduce the whole efficiency of system。Active clamp technology realizes a kind of method that magnetic reset is function admirable, and its deficiency is the increase in the complexity of converter circuit and design difficulty thereof and cost。The advantage adopting the forward converter of magnetic reset winding is that technology maturation is reliable, and magnetization energy can feed back in input power, but additional magnetic reset winding makes transformer device structure complicate, and adds the voltage stress of power switch pipe。
Summary of the invention
The technical problem to be solved is in that for above-mentioned deficiency of the prior art, it is provided that the method for designing of a kind of secondary simplex winding Self-resetting forward conversion circuit, and its method step is simple, reasonable in design, it is achieved convenient, practical, and application value is high。
For solving above-mentioned technical problem, the technical solution used in the present invention is: the method for designing of a kind of secondary simplex winding Self-resetting forward conversion circuit, described secondary simplex winding Self-resetting forward conversion circuit includes forward converter main circuit, magnetization energy storage circuit and magnetization energy carry circuit, described forward converter main circuit includes high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, the described grid of switching tube Q1 is connected with the outfan of peripheral control unit, the drain electrode of described switching tube Q1 is connected with one end of a winding W1 of high frequency transformer T1, the cathode voltage input IN+ that the other end is forward converter main circuit of winding W1 of described high frequency transformer T1 and being connected with the cathode output end of external power source, the cathode voltage input IN-that source electrode is forward converter main circuit of described switching tube Q1 and being connected with the cathode output end of external power source, the anode of described diode D1 is connected with one end of the Secondary Winding W2 of high frequency transformer T1, the negative electrode of described diode D1 and the negative electrode of diode D2 are all connected with one end of inductance L1, the other end of described inductance L1 is connected and is the cathode voltage outfan OUT+ of forward converter main circuit with one end of electric capacity C1, the anode of described diode D2 and the other end of electric capacity C1 are all connected and are the cathode voltage outfan OUT-of forward converter main circuit with the other end of the Secondary Winding W2 of high frequency transformer T1；Described magnetization energy storage circuit includes diode D3 and electric capacity C2, and the anode of described diode D3 is connected with the negative electrode of diode D1, and the negative electrode of described diode D3 is connected with one end of electric capacity C2, and the other end of described electric capacity C2 is connected with the anode of diode D1；Described magnetization energy release circuit includes diode D4 and inductance L2, the anode of described diode D4 is connected with the negative electrode of diode D3, the negative electrode of described diode D4 is connected with one end of inductance L2, and the other end of described inductance L2 is connected with the cathode voltage outfan OUT+ of forward converter main circuit；It is characterized in that, this method for designing comprises the following steps:
Step one, the selection composition high frequency transformer T1 of suitable parameters of forward converter main circuit, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, its detailed process is as follows:
Step 101, choosing high frequency transformer T1, detailed process is:
Step 1011, according to formulaDetermine the magnetic core product of areas AP of high frequency transformer T1, wherein, PsFor high frequency transformer T1 apparent energy andPoOutput and P for high frequency transformer T1o=IoVo, IoFor the output electric current of forward converter main circuit, VoOutput voltage for forward converter main circuit, η is the efficiency of transmission of high frequency transformer T1 and value is 80%～90%, Δ B is the maximum flux of high frequency transformer T1, f is the switching frequency of switching tube Q1, J is the electric current density flowing through high frequency transformer T1, and Ku is the effective coefficient of utilization of window of the magnetic core of high frequency transformer T1；
Step 1012, according to formulaDetermine a winding W1 of high frequency transformer T1 and the turn ratio n of Secondary Winding, wherein, Nw1For the number of turn of a winding W1 of high frequency transformer T1, Nw2For the number of turn of the Secondary Winding W2 of high frequency transformer T1, VI, minFor the minimum input voltage of forward converter main circuit, d 'maxFor the maximum duty cycle of switching tube Q1, VfConduction voltage drop and V for diodef=0.7V；
Step 1013, according to formulaCalculate the effective current I of a winding W1 of high frequency transformer T1prms；
Step 1014, according to formulaCalculate the effective current I of the Secondary Winding W2 of high frequency transformer T1srms；
Step 1015, according to the magnetic core product of areas AP of high frequency transformer T1, winding W1 and the turn ratio n of Secondary Winding of high frequency transformer T1, high frequency transformer T1 the effective current I of a winding W1prmsEffective current I with the Secondary Winding W2 of high frequency transformer T1srmsFour parameters choose high frequency transformer T1；
Step 102, choosing switching tube Q1, detailed process is:
Step 1021, according to formula VS, max=1.3(Vi,max+nVO) calculate the switching tube Q1 maximum voltage stress V being subjected toS,max, wherein, Vi,maxMaximum input voltage for forward converter main circuit；
Step 1022, choose pressure voltage more than VS,maxSwitching tube model as switching tube Q1；
Step 103, according to formulaChoose the inductance value of inductance L1, wherein, RL,minThe minima of the load resistance RL for being connected between the cathode voltage outfan OUT-of forward converter main circuit and cathode voltage outfan OUT+, LminElectric current continuous conduction mode corresponding to minimum load resistance and maximum input voltage and the threshold inductance of electric current discontinuous conduction mode；
Step 104, according to formulaChoosing the capacitance of electric capacity C1, wherein, λ is nargin coefficient, Vpp,maxFor the maximum output ripple voltage of forward converter main circuit, CminFor minimum output filter capacitor；
Step 105, choosing diode D1, detailed process is:
Step 1051, according to formulaDetermine the maximum current I flowing through diode D1D1,max, wherein, ViFor the input voltage of forward converter main circuit, d ' is the dutycycle of switching tube Q1, and T is the switch periods of switching tube Q1；
Step 1052, according to formula VD1,max=VoDetermine the pressure voltage V of diode D1D1,max；
Step 1053, basis flow through the maximum current I of diode D1D1,maxPressure voltage V with diode D1D1,maxSelect diode D1；
Step 106, choosing diode D2, detailed process is:
Step 1061, according to formulaDetermine the maximum current I flowing through diode D2D2,max, wherein, LmFor the magnetizing inductance of a winding W1 of high frequency transformer T1 and take Lm=Lw1, Lw1Inductance value for a winding W1 of high frequency transformer T1；
Step 1062, according to formula VD2,max=VoDetermine the pressure voltage V of diode D2D2,max；
Step 1063, basis flow through the maximum current I of diode D2D2,maxPressure voltage V with diode D2D2,maxSelect diode D2；
Step 2, connection high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, form forward converter main circuit, and its detailed process is as follows:
Step 201, using the grid of the switching tube Q1 input as external control signal, and the drain electrode of switching tube Q1 is received one end of a winding W1 of high frequency transformer T1；
Step 202, using the other end of a winding W1 of the high frequency transformer T1 cathode voltage input IN+ as forward converter main circuit, and using the source electrode of the switching tube Q1 cathode voltage input IN-as forward converter main circuit；
Step 203, the anode of diode D1 is received one end of the Secondary Winding W2 of high frequency transformer T1, and the negative electrode of diode D1 and the negative electrode of diode D2 are all received one end of inductance L1, the other end of inductance L1 is received one end of electric capacity C1, and draw wire, as the cathode voltage outfan OUT+ of forward converter main circuit；
Step 204, the anode of diode D2 is received the other end of the Secondary Winding W2 of high frequency transformer T1, and draw wire, as the cathode voltage outfan OUT-of forward converter main circuit；
Step 3, selection composition magnetization energy store the diode D3 and electric capacity C2 of the suitable parameters of circuit, and its detailed process is as follows:
Step 301, choosing electric capacity C2, detailed process is:
Step 3011, according to formulaDetermine the span of the capacitance of electric capacity C2, wherein, Lw2Inductance value for the Secondary Winding W2 of high frequency transformer T1；
Step 3012, takeAccording to formulaCalculate the two ends maximum voltage value V that electric capacity C2 charging obtainsC2,max；
Step 3013, according to formula VT,C2≥VC2.maxDetermine the pressure voltage V of electric capacity C2T,C2Span；
Step 3014, pressure voltage V according to the span of the capacitance of electric capacity C2 and electric capacity C2T,C2Span select electric capacity C2；
Step 302, choosing diode D3, detailed process is:
Step 3021, according to formulaDetermine the maximum current I flowing through diode D3D3,max；
Step 3022, according to formula VD3,max=VC2,maxDetermine the pressure voltage V of diode D3D3,max；
Step 3023, basis flow through the maximum current I of diode D3D3,maxPressure voltage V with diode D3D3,maxSelect diode D3；
Step 4, connection diode D3 and electric capacity C2, composition magnetization energy storage circuit, and be connected with forward converter main circuit, its detailed process is as follows:
Step 401, the anode of diode D3 is received the negative electrode of diode D1, and the negative electrode of diode D3 is received one end of electric capacity C2；
Step 402, the other end of electric capacity C2 is received the anode of diode D1；
Step 5, selection form the diode D4 and inductance L2 of the suitable parameters of magnetization energy release circuit, and its detailed process is as follows:
Step 501, choosing inductance L2, detailed process is:
Step 5011, according to formulaDetermine the span of the inductance value of inductance L2；
Step 5012, according to formulaDetermine the maximum I of the electric current flowing through inductance L2L2,max；
Step 5013, maximum I according to the span of the inductance value of inductance L2 and the electric current flowing through inductance L2L2,maxSelect inductance L2；
Step 502, choosing diode D4, detailed process is:
Step 5021, according to formulaDetermine the maximum current I flowing through diode D4D4,max；
Step 5022, according to formula VD4,max=VoDetermine the pressure voltage V of diode D4D4,max；
Step 5023, basis flow through the maximum current I of diode D4D4,maxPressure voltage V with diode D4D4,maxSelect diode D4；
Step 6, connection diode D4 and inductance L2, form magnetization energy release circuit, and be connected with forward converter main circuit, and its detailed process is as follows:
Step 601, the anode of diode D4 is received the negative electrode of diode D3, and the negative electrode of diode D4 is received one end of inductance L2；
Step 602, the other end of inductance L2 is received the cathode voltage outfan OUT+ of forward converter main circuit。
The method for designing of above-mentioned a kind of vice-side winding Self-resetting forward converter circuit, it is characterised in that: described switching tube Q1 is nmos switch pipe。
The method for designing of above-mentioned a kind of vice-side winding Self-resetting forward converter circuit, it is characterised in that: in step 1011, the value of η is 80%～90%, and the value of Δ B is the value of 0.2T～0.4T, J is 400A/cm2, the value of Ku is 0.2。
The method for designing of above-mentioned a kind of vice-side winding Self-resetting forward converter circuit, it is characterised in that: in step 104, the value of λ is 2～4。
The present invention compared with prior art has the advantage that
1, the method step of the present invention is simple, reasonable in design, it is achieved convenient, practical。
2, adopting the present invention to design the secondary simplex winding Self-resetting forward conversion circuit of realization, circuit structure is simple, and magnetic reset loop is positioned at transformer secondary, reasonable in design, and capacity usage ratio is high, it is achieved convenience and cost are low。
3, the present invention is adopted to design the secondary simplex winding Self-resetting forward conversion circuit of realization, it is possible in conjunction with the advantage of forward converter circuit and anti exciting converter circuit, input and output electrical isolation, it is prone to multiple-channel output, integrated circuit is low in energy consumption, and magnetic core of transformer utilization rate is high, practical。
4, adopting the present invention to design the secondary simplex winding Self-resetting forward conversion circuit of realization, job stability and reliability high, magnetic reset loop structure is simple, device is simple, low in energy consumption, and transformer utilization factor is high, energy transmission efficiency is high, long service life, it is simple to promote the use of。
5, after using the present invention to design the secondary simplex winding Self-resetting forward conversion circuit of realization in Switching Power Supply, job security and the reliability of Switching Power Supply are higher, magnetization energy storage circuit and the magnetization energy carry circuit assisted enable that utilization rate improves, more in middle low power applications, can be widely applied to the fields such as computer, medical communication, Industry Control, space equipment。
Below by drawings and Examples, technical scheme is described in further detail。
Accompanying drawing explanation
Fig. 1 is the structural representation of secondary simplex winding Self-resetting forward conversion circuit of the present invention。
Fig. 2 is the method flow block diagram of the method for designing of secondary simplex winding Self-resetting forward conversion circuit of the present invention。
Description of reference numerals:
1 forward converter main circuit；2 magnetization energy storage circuit；3 magnetization energy carry circuits。
Detailed description of the invention
The method for designing of the secondary simplex winding Self-resetting forward conversion circuit of the present invention, as shown in Figure 1, described secondary simplex winding Self-resetting forward conversion circuit includes forward converter main circuit 1, magnetization energy storage circuit 2 and magnetization energy carry circuit 3, described forward converter main circuit 1 includes high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, the described grid of switching tube Q1 is connected with the outfan of peripheral control unit, the drain electrode of described switching tube Q1 is connected with one end of a winding W1 of high frequency transformer T1, the cathode voltage input IN+ that the other end is forward converter main circuit 1 of winding W1 of described high frequency transformer T1 and being connected with the cathode output end of external power source, the cathode voltage input IN-that source electrode is forward converter main circuit 1 of described switching tube Q1 and being connected with the cathode output end of external power source, the anode of described diode D1 is connected with one end of the Secondary Winding W2 of high frequency transformer T1, the negative electrode of described diode D1 and the negative electrode of diode D2 are all connected with one end of inductance L1, the other end of described inductance L1 is connected and is the cathode voltage outfan OUT+ of forward converter main circuit 1 with one end of electric capacity C1, the anode of described diode D2 and the other end of electric capacity C1 are all connected and are the cathode voltage outfan OUT-of forward converter main circuit 1 with the other end of the Secondary Winding W2 of high frequency transformer T1；Described magnetization energy storage circuit 2 includes diode D3 and electric capacity C2, and the anode of described diode D3 is connected with the negative electrode of diode D1, and the negative electrode of described diode D3 is connected with one end of electric capacity C2, and the other end of described electric capacity C2 is connected with the anode of diode D1；Described magnetization energy carry circuit 3 includes diode D4 and inductance L2, the anode of described diode D4 is connected with the negative electrode of diode D3, the negative electrode of described diode D4 is connected with one end of inductance L2, and the other end of described inductance L2 is connected with the cathode voltage outfan OUT+ of forward converter main circuit 1；As in figure 2 it is shown, this method for designing comprises the following steps:
Step one, the selection composition high frequency transformer T1 of suitable parameters of forward converter main circuit 1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, its detailed process is as follows:
Step 101, choosing high frequency transformer T1, detailed process is:
Step 1011, according to formulaDetermine that (unit of AP is cm for the magnetic core product of areas AP of high frequency transformer T14), wherein, PsFor high frequency transformer T1 apparent energy and(PsUnit be W), PoOutput and P for high frequency transformer T1o=IoVo(PoUnit be W), IoOutput electric current (I for forward converter main circuit 1oUnit be A), VoOutput voltage (V for forward converter main circuit 1oUnit be V), η is the efficiency of transmission of high frequency transformer T1, Δ B is the maximum flux (unit of Δ B is T) of high frequency transformer T1, f is the switching frequency (unit of f is Hz) of switching tube Q1, and J flows through the electric current density of high frequency transformer T1 (unit of J is A/cm2), Ku is the effective coefficient of utilization of window of the magnetic core of high frequency transformer T1；
In the present embodiment, in step 1011, the value of η is 80%～90%, it is preferred to 85%, and the value of Δ B is 0.2T～0.4T, it is preferred to the value of 0.3T, J is 400A/cm2, the value of Ku is 0.2。
In the present embodiment, take Vo=24V, Io=2A, then Po=48W, Ps=104.5W；Take f=105Hz, then AP=0.218cm4；
Step 1012, according to formulaDetermine a winding W1 of high frequency transformer T1 and the turn ratio n of Secondary Winding, wherein, Nw1For the number of turn of a winding W1 of high frequency transformer T1, Nw2For the number of turn of the Secondary Winding W2 of high frequency transformer T1, VI, minFor the minimum input voltage (namely external power source exports to the minimum voltage of forward converter main circuit 1, and unit is V) of forward converter main circuit 1, d 'maxFor the maximum duty cycle of switching tube Q1, VfConduction voltage drop and V for diodef=0.7V；
In the present embodiment, take VI, min=200V, d 'max=0.5, then n=4:1；
Step 1013, according to formulaCalculate the effective current I of a winding W1 of high frequency transformer T1prms(IprmsUnit be A)；
In the present embodiment, Iprms=0.40A；
Step 1014, according to formulaCalculate the effective current I of the Secondary Winding W2 of high frequency transformer T1srms(IsrmsUnit be A)；
In the present embodiment, Isrms=1.41A；
Step 1015, according to the magnetic core product of areas AP of high frequency transformer T1, winding W1 and the turn ratio n of Secondary Winding of high frequency transformer T1, high frequency transformer T1 the effective current I of a winding W1prmsEffective current I with the Secondary Winding W2 of high frequency transformer T1srmsFour parameters choose high frequency transformer T1；
Step 102, choosing switching tube Q1, detailed process is:
Step 1021, according to formula VS, max=1.3(Vi,max+nVO) calculate the switching tube Q1 maximum voltage stress V being subjected toS,max, wherein, Vi,maxMaximum input voltage (namely external power source exports to the maximum voltage of forward converter main circuit 1, and unit is V) for forward converter main circuit 1；
In the present embodiment, take Vi,max=300V, then VS,max=514.8V；
Step 1022, choose pressure voltage more than VS,maxSwitching tube model as switching tube Q1；
In the present embodiment, described switching tube Q1 is nmos switch pipe。
Step 103, according to formulaChoose the inductance value (unit is H) of inductance L1, wherein, RL,minMinima (the R of the load resistance RL for being connected between the cathode voltage outfan OUT-of forward converter main circuit 1 and cathode voltage outfan OUT+L,minUnit be Ω), LminElectric current continuous conduction mode (CCM) corresponding to minimum load resistance and maximum input voltage and the threshold inductance of electric current discontinuous conduction mode (DCM), the i.e. lower limit (L of inductor design valueminUnit be H)；
In the present embodiment, take RL,min=12 Ω, then Lmin=41 × 10-6H, therefore chooses inductance value more than 41 × 10-6The inductance L1 of H；Preferably, the inductance value of inductance L1 is 6 × 10-5H；
Step 104, according to formulaChoosing the capacitance (unit is F) of electric capacity C1, wherein, λ is nargin coefficient, Vpp,maxMaximum output ripple voltage (V for forward converter main circuit 1pp,maxUnit be V), CminFor minimum output filter capacitor；
In the present embodiment, in step 104, the value of λ is 2～4, it is preferred to 3；
In the present embodiment, take Vpp,max=0.24V, then Cmin=4.3 × 10-5F, therefore chooses capacitance more than 4.3 × 10-5The electric capacity C1 of F；Preferably, the capacitance of electric capacity C1 is 4.7 × 10-5F；
Step 105, choosing diode D1, detailed process is:
Step 1051, according to formulaDetermine the maximum current I flowing through diode D1D1,max(ID1,maxUnit be A), wherein, ViFor the input voltage (namely external power source exports to the voltage of forward converter main circuit 1, and unit is V) of forward converter main circuit 1, d ' is the dutycycle of switching tube Q1, and T is the switch periods (unit of T is s) of switching tube Q1；
In the present embodiment, take Vi=300V, d '=0.3, T=10-5S, then ID1,max=2.55A；
Step 1052, according to formula VD1,max=VoDetermine the pressure voltage V of diode D1D1,max(VD1,maxUnit be V)；
In the present embodiment, VD1,max=24V；
Step 1053, basis flow through the maximum current I of diode D1D1,maxPressure voltage V with diode D1D1,maxSelect diode D1；Namely the electric current that can bear is chosen more than ID1,maxAnd pressure voltage is more than VD1,maxDiode D1；
Step 106, choosing diode D2, detailed process is:
Step 1061, according to formulaDetermine the maximum current I flowing through diode D2D2,max(ID2,maxUnit be A), wherein, LmFor the magnetizing inductance of a winding W1 of high frequency transformer T1 and take Lm=Lw1, Lw1Inductance value (unit is H) for a winding W1 of high frequency transformer T1；
In the present embodiment, take Lw1=0.005H, then ID2,max=0.72A；
Step 1062, according to formula VD2,max=VoDetermine the pressure voltage V of diode D2D2,max(VD2,maxUnit be V)；
In the present embodiment, VD2,max=24V；
Step 1063, basis flow through the maximum current I of diode D2D2,maxPressure voltage V with diode D2D2,maxSelect diode D2；Namely the electric current that can bear is chosen more than ID2,maxAnd pressure voltage is more than VD2,maxDiode D2；
Step 2, connection high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, form forward converter main circuit 1, and its detailed process is as follows:
Step 201, using the grid of the switching tube Q1 input (for be connected with the outfan of peripheral control unit) as external control signal, and the drain electrode of switching tube Q1 is received one end of a winding W1 of high frequency transformer T1；
Step 202, using the other end of a winding W1 of the high frequency transformer T1 cathode voltage input IN+ (for is connected with the cathode output end of external power source) as forward converter main circuit 1, and using the source electrode of the switching tube Q1 cathode voltage input IN-(being used for being connected with the cathode output end of external power source) as forward converter main circuit 1；
Step 203, the anode of diode D1 is received one end of the Secondary Winding W2 of high frequency transformer T1, and the negative electrode of diode D1 and the negative electrode of diode D2 are all received one end of inductance L1, the other end of inductance L1 is received one end of electric capacity C1, and draw wire, as the cathode voltage outfan OUT+ of forward converter main circuit 1；
Step 204, the anode of diode D2 is received the other end of the Secondary Winding W2 of high frequency transformer T1, and draw wire, as the cathode voltage outfan OUT-of forward converter main circuit 1；
Step 3, selection composition magnetization energy store the diode D3 and electric capacity C2 of the suitable parameters of circuit 2, and its detailed process is as follows:
Step 301, choosing electric capacity C2, detailed process is:
Step 3011, according to formulaDetermine the span of the capacitance of electric capacity C2, wherein, Lw2Inductance value (unit is H) for the Secondary Winding W1 of high frequency transformer T1；
In the present embodiment, take Lw2=313 × 10-6H, thenThe span of the capacitance of the electric capacity C2 namely determined is 0 < C2≤6.3 × 10-8F；
Step 3012, takeAccording to formulaCalculate the two ends maximum voltage value V that electric capacity C2 charging obtainsC2,max；
In the present embodiment, take C2max=6.3 × 10-8F, then VC2,max=51V；
Step 3013, according to formula VT,C2≥VC2.maxDetermine the pressure voltage V of electric capacity C2T,C2Span；
In the present embodiment, it is determined that the pressure voltage V of the electric capacity C2 gone outT,C2Span be VT,C2>=51V,
Step 3014, pressure voltage V according to the span of the capacitance of electric capacity C2 and electric capacity C2T,C2Span select electric capacity C2；Namely selecting capacitance is 0 < C2≤6.3 × 10-8F, and pressure voltage is more than VT,C2Electric capacity C2；
In the present embodiment, the capacitance selecting electric capacity C2 is 6.3 × 10-8F, pressure voltage is 51V；
Step 302, choosing diode D3, detailed process is:
Step 3021, according to formulaDetermine the maximum current I flowing through diode D3D3,max(ID3,maxUnit be A)；
In the present embodiment, ID3,max=0.72A；
Step 3022, according to formula VD3,max=VC2,maxDetermine the pressure voltage V of diode D3D3,max(VD3,maxUnit be V)；
In the present embodiment, VD3,max=51V；
Step 3023, basis flow through the maximum current I of diode D3D3,maxPressure voltage V with diode D3D3,maxSelect diode D3；Namely the electric current that can bear is chosen more than ID3,maxAnd pressure voltage is more than VD3,maxDiode D3；
Step 4, connection diode D3 and electric capacity C2, composition magnetization energy storage circuit 2, and be connected with forward converter main circuit 1, its detailed process is as follows:
Step 401, the anode of diode D3 is received the negative electrode of diode D1, and the negative electrode of diode D3 is received one end of electric capacity C2；
Step 402, the other end of electric capacity C2 is received the anode of diode D1；
Step 5, selection form the diode D4 and inductance L2 of the suitable parameters of magnetization energy release circuit 3, and its detailed process is as follows:
Step 501, choosing inductance L2, detailed process is:
Step 5011, according to formulaDetermine the span of the inductance value of inductance L2；
In the present embodiment,The span of the inductance value of the inductance L2 namely determined is 0 < L2≤5.7 × 10-5H；
Step 5012, according to formulaDetermine the maximum I of the electric current flowing through inductance L2L2,max；
In the present embodiment, IL2,max=1.07A；
Step 5013, maximum I according to the span of the inductance value of inductance L2 and the electric current flowing through inductance L2L2,maxSelect inductance L2；Namely the span selecting inductance value is 0 < L2≤5.7 × 10-5H, and the electric current that can bear is more than IL2,maxInductance L2；
Step 502, choosing diode D4, detailed process is:
Step 5021, according to formulaDetermine the maximum current I flowing through diode D4D4,max(ID4,maxUnit be A)；
In the present embodiment, ID4,max=1.07A；
Step 5022, according to formula VD4,max=VoDetermine the pressure voltage V of diode D4D4,max(VD4,maxUnit be V)；
In the present embodiment, VD4,max=24V；
Step 5023, basis flow through the maximum current I of diode D4D4,maxPressure voltage V with diode D4D4,maxSelect diode D4；Namely the electric current that can bear is chosen more than ID4,maxAnd pressure voltage is more than VD4,maxDiode D3；
Step 6, connection diode D4 and inductance L2, form magnetization energy release circuit 3, and be connected with forward converter main circuit 1, and its detailed process is as follows:
Step 601, the anode of diode D4 is received the negative electrode of diode D3, and the negative electrode of diode D4 is received one end of inductance L2；
Step 602, the other end of inductance L2 is received the cathode voltage outfan OUT+ of forward converter main circuit 1。
The operation principle of the secondary simplex winding Self-resetting forward converter circuit of the method design of the employing present invention is:
Peripheral control unit output pwm pulse, controls switching tube Q1 periodically turn-on and turn-off；
Terminate the moment being about to turn off in switching tube Q1 conducting, the magnetization energy of high frequency transformer T1 reaches maximum, and the voltage of electric capacity C2 has discharged into zero；
When switching tube Q1 turns off, the voltage of the Secondary Winding W2 of high frequency transformer T1 be upper negative under just, the reverse-biased shutoff of diode D1, diode D2 turns on afterflow, now diode D2, inductance L1, electric capacity C1 and the load resistance RL being connected between the cathode voltage outfan OUT-of forward converter main circuit 1 and cathode voltage outfan OUT+ constitute exoergic loop, continue to provide energy to load resistance RL；Simultaneously, diode D3 turns on, diode D3 and electric capacity C2 constitutes magnetization energy storage circuit 2, the Secondary Winding W2 of high frequency transformer T1 is charged to electric capacity C2 by diode D2 and diode D3, the magnetization energy of high frequency transformer T1 is transferred in electric capacity C2, and the exciting current of high frequency transformer T1 is gradually reduced, until being reduced to zero, before next turn-on cycle arrives, the magnetization energy of high frequency transformer T1 is transferred completely in electric capacity C2, and the voltage at electric capacity C2 two ends is charged to maximum；Inductance L2, diode D2, diode D3, diode D4 and load resistance RL constitute energy Releasing loop, and inductance L2 provides energy to load resistance RL；
During switching tube Q1 turns off, when the voltage of cathode terminal of diode D3 is more than the output voltage Vo of forward converter main circuit 1, diode D4 turns on, before the exciting current of high frequency transformer T1 is reduced to zero, a part of exciting current flows to outfan by inductance L2, provides energy to load resistance RL；Another part exciting current continues electric capacity C2 is charged, and electric capacity C2 both end voltage continues to increase, until exciting current is reduced to zero；Exciting current at high frequency transformer T1 is reduced to zero and next cycle of opening when not arriving, and electric capacity C2 will pass through diode D4, inductance L2 provides energy to load resistance RL, and the cathode terminal voltage until diode D3 is equal to output voltage Vo；Now, electric capacity C2 stops exoergic, and the voltage at electric capacity C2 two ends no longer changes, and inductance L2, load resistance RL, diode D2, diode D3 and diode D4 constitute energy Releasing loop, release energy to load resistance RL, opens cycle arrival until next；
When the next one opens cycle arrival, switching tube Q1 turns on, outer power voltage Vi is added in winding W1 two ends of high frequency transformer T1, voltage is coupled to Secondary Winding W2 from a winding W1 by high frequency transformer T1, now, the voltage of a winding W1 of high frequency transformer T1 is upper just lower negative, and the voltage of Secondary Winding W2 couple with winding W1 also just lower is born for upper, diode D1 turns on, and to electric capacity C1 charging and provides energy to load resistance RL by inductance L1；Now, forward converter main circuit 1 normal operation；Simultaneously, owing to electric capacity C2 both end voltage can not be suddenlyd change, the voltage making the cathode terminal of diode D3 raises rapidly therewith, and the voltage of the anode tap higher than diode D3, diode D3 is not turned on, and electric capacity C2 is allowed to discharge through inductance L2 and shifts energy to load resistance RL, inductance L2 is charged simultaneously, until the voltage of electric capacity C2 is reduced to zero, namely stored in electric capacity C2 whole energy are transferred to load resistance RL by the magnetization energy carry circuit 3 being made up of diode D4 and inductance L2；When the voltage of electric capacity C2 is reduced to zero, switching tube Q1 is still in conducting state, now the Secondary Winding W2 of high frequency transformer T1, diode D1, diode D3, diode D4, inductance L2 and load resistance RL constitute energy Releasing loop, release energy to load resistance RL, inductance L2 is charged, until the next shutoff cycle arrives simultaneously。
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure change above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention。

Claims (4)

1. the method for designing of a secondary simplex winding Self-resetting forward conversion circuit, described secondary simplex winding Self-resetting forward conversion circuit includes forward converter main circuit (1), magnetization energy storage circuit (2) and magnetization energy carry circuit (3), described forward converter main circuit (1) includes high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, the described grid of switching tube Q1 is connected with the outfan of peripheral control unit, the drain electrode of described switching tube Q1 is connected with one end of a winding W1 of high frequency transformer T1, the other end of winding W1 of described high frequency transformer T1 is the cathode voltage input IN+ of forward converter main circuit (1) and is connected with the cathode output end of external power source, the source electrode of described switching tube Q1 is the cathode voltage input IN-of forward converter main circuit (1) and is connected with the cathode output end of external power source, the anode of described diode D1 is connected with one end of the Secondary Winding W2 of high frequency transformer T1, the negative electrode of described diode D1 and the negative electrode of diode D2 are all connected with one end of inductance L1, the other end of described inductance L1 is connected and is the cathode voltage outfan OUT+ of forward converter main circuit (1) with one end of electric capacity C1, the anode of described diode D2 and the other end of electric capacity C1 are all connected and are the cathode voltage outfan OUT-of forward converter main circuit (1) with the other end of the Secondary Winding W2 of high frequency transformer T1；Described magnetization energy storage circuit (2) includes diode D3 and electric capacity C2, the anode of described diode D3 is connected with the negative electrode of diode D1, the negative electrode of described diode D3 is connected with one end of electric capacity C2, and the other end of described electric capacity C2 is connected with the anode of diode D1；Described magnetization energy carry circuit (3) includes diode D4 and inductance L2, the anode of described diode D4 is connected with the negative electrode of diode D3, the negative electrode of described diode D4 is connected with one end of inductance L2, and the other end of described inductance L2 is connected with the cathode voltage outfan OUT+ of forward converter main circuit (1)；It is characterized in that, this method for designing comprises the following steps:
Step one, the high frequency transformer T1 of suitable parameters of selection composition forward converter main circuit (1), switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, its detailed process is as follows:
Step 101, choosing high frequency transformer T1, detailed process is:
Step 1011, according to formulaDetermine the magnetic core product of areas AP of high frequency transformer T1, wherein, PsFor high frequency transformer T1 apparent energy andPoOutput and P for high frequency transformer T1o=IoVo, IoFor the output electric current of forward converter main circuit (1), VoOutput voltage for forward converter main circuit (1), η is the efficiency of transmission of high frequency transformer T1 and value is 80%～90%, Δ B is the maximum flux of high frequency transformer T1, f is the switching frequency of switching tube Q1, J is the electric current density flowing through high frequency transformer T1, and Ku is the effective coefficient of utilization of window of the magnetic core of high frequency transformer T1；
Step 1012, according to formulaDetermine a winding W1 of high frequency transformer T1 and the turn ratio n of Secondary Winding, wherein, Nw1For the number of turn of a winding W1 of high frequency transformer T1, Nw2For the number of turn of the Secondary Winding W2 of high frequency transformer T1, VI, minFor the minimum input voltage of forward converter main circuit (1), d 'maxFor the maximum duty cycle of switching tube Q1, VfConduction voltage drop and V for diodef=0.7V；
Step 1013, according to formulaCalculate the effective current I of a winding W1 of high frequency transformer T1prms；
Step 1014, according to formulaCalculate the effective current I of the Secondary Winding W2 of high frequency transformer T1srms；
Step 1015, according to the magnetic core product of areas AP of high frequency transformer T1, winding W1 and the turn ratio n of Secondary Winding of high frequency transformer T1, high frequency transformer T1 the effective current I of a winding W1prmsEffective current I with the Secondary Winding W2 of high frequency transformer T1srmsFour parameters choose high frequency transformer T1；
Step 102, choosing switching tube Q1, detailed process is:
Step 1021, according to formula VS,max=1.3 (Vi,max+nVO) calculate the switching tube Q1 maximum pressure V being subjected toS,max, wherein, Vi,maxMaximum input voltage for forward converter main circuit (1)；
Step 1022, choose pressure voltage more than VS,maxSwitching tube model as switching tube Q1；
Step 103, according to formulaChoose the inductance value of inductance L1, wherein, RL,minThe minima of the load resistance RL for being connected between the cathode voltage outfan OUT-of forward converter main circuit (1) and cathode voltage outfan OUT+, LminElectric current continuous conduction mode corresponding to minimum load resistance and maximum input voltage and the threshold inductance of electric current discontinuous conduction mode；
Step 104, according to formulaChoosing the capacitance of electric capacity C1, wherein, λ is nargin coefficient, Vpp,maxFor the maximum output ripple voltage of forward converter main circuit (1), CminFor minimum output filter capacitor；
Step 105, choosing diode D1, detailed process is:
Step 1051, according to formulaDetermine the maximum current I flowing through diode D1D1,max, wherein, ViFor the input voltage of forward converter main circuit (1), d ' is the dutycycle of switching tube Q1, and T is the switch periods of switching tube Q1；
Step 1052, according to formula VD1,max=VoDetermine the pressure voltage V of diode D1D1,max；
Step 1053, basis flow through the maximum current I of diode D1D1,maxPressure voltage V with diode D1D1,maxSelect diode D1；
Step 106, choosing diode D2, detailed process is:
Step 1061, according to formulaDetermine the maximum current I flowing through diode D2D2,max, wherein, LmFor the magnetizing inductance of a winding W1 of high frequency transformer T1 and take Lm=Lw1, Lw1Inductance value for a winding W1 of high frequency transformer T1；
Step 1062, according to formula VD2,max=VoDetermine the pressure voltage V of diode D2D2,max；
Step 1063, basis flow through the maximum current I of diode D2D2,maxPressure voltage V with diode D2D2,maxSelect diode D2；
Step 2, connection high frequency transformer T1, switching tube Q1, diode D1, diode D2, inductance L1 and electric capacity C1, composition forward converter main circuit (1), its detailed process is as follows:
Step 201, using the grid of the switching tube Q1 input as external control signal, and the drain electrode of switching tube Q1 is received one end of a winding W1 of high frequency transformer T1；
Step 202, using the other end of a winding W1 of the high frequency transformer T1 cathode voltage input IN+ as forward converter main circuit (1), and using the source electrode of the switching tube Q1 cathode voltage input IN-as forward converter main circuit (1)；
Step 203, the anode of diode D1 is received one end of the Secondary Winding W2 of high frequency transformer T1, and the negative electrode of diode D1 and the negative electrode of diode D2 are all received one end of inductance L1, the other end of inductance L1 is received one end of electric capacity C1, and draw wire, as the cathode voltage outfan OUT+ of forward converter main circuit (1)；
Step 204, the anode of diode D2 is received the other end of the Secondary Winding W2 of high frequency transformer T1, and draw wire, as the cathode voltage outfan OUT-of forward converter main circuit (1)；
Step 3, selection composition magnetization energy store the diode D3 and electric capacity C2 of the suitable parameters of circuit (2), and its detailed process is as follows:
Step 301, choosing electric capacity C2, detailed process is:
Step 3011, according to formulaDetermine the span of the capacitance of electric capacity C2, wherein, Lw2Inductance value for the Secondary Winding W2 of high frequency transformer T1；
Step 3012, takeAccording to formulaCalculate the two ends maximum voltage value V that electric capacity C2 charging obtainsC2,max；
Step 3013, according to formula VT,C2≥VC2.maxDetermine the pressure voltage V of electric capacity C2T,C2Span；
Step 3014, pressure voltage V according to the span of the capacitance of electric capacity C2 and electric capacity C2T,C2Span select electric capacity C2；
Step 302, choosing diode D3, detailed process is:
Step 3021, according to formulaDetermine the maximum current I flowing through diode D3D3,max；
Step 3022, according to formula VD3,max=VC2,maxDetermine the pressure voltage V of diode D3D3,max；
Step 3023, basis flow through the maximum current I of diode D3D3,maxPressure voltage V with diode D3D3,maxSelect diode D3；
Step 4, connection diode D3 and electric capacity C2, composition magnetization energy storage circuit (2), and be connected with forward converter main circuit (1), its detailed process is as follows:
Step 401, the anode of diode D3 is received the negative electrode of diode D1, and the negative electrode of diode D3 is received one end of electric capacity C2；
Step 402, the other end of electric capacity C2 is received the anode of diode D1；
Step 5, selection form the diode D4 and inductance L2 of the suitable parameters of magnetization energy carry circuit (3), and its detailed process is as follows:
Step 501, choosing inductance L2, detailed process is:
Step 5011, according to formulaDetermine the span of the inductance value of inductance L2；
Step 5012, according to formulaDetermine the maximum I of the electric current flowing through inductance L2L2,max；
Step 5013, maximum I according to the span of the inductance value of inductance L2 and the electric current flowing through inductance L2L2,maxSelect inductance L2；
Step 502, choosing diode D4, detailed process is:
Step 5021, according to formulaDetermine the maximum current I flowing through diode D4D4,max；
Step 5022, according to formula VD4,max=VoDetermine the pressure voltage V of diode D4D4,max；
Step 5023, basis flow through the maximum current I of diode D4D4,maxPressure voltage V with diode D4D4,maxSelect diode D4；
Step 6, connection diode D4 and inductance L2, composition magnetization energy carry circuit (3), and be connected with forward converter main circuit (1), its detailed process is as follows:
Step 601, the anode of diode D4 is received the negative electrode of diode D3, and the negative electrode of diode D4 is received one end of inductance L2；
Step 602, the other end of inductance L2 is received the cathode voltage outfan OUT+ of forward converter main circuit (1)。
2. the method for designing of the secondary simplex winding Self-resetting forward conversion circuit described in claim 1, it is characterised in that: described switching tube Q1 is nmos switch pipe。
3. the method for designing of the secondary simplex winding Self-resetting forward conversion circuit described in claim 1, it is characterised in that: in step 1011, the value of η is 80%～90%, and the value of Δ B is the value of 0.2T～0.4T, J is 400A/cm2, the value of Ku is 0.2。
4. the method for designing of the secondary simplex winding Self-resetting forward conversion circuit described in claim 1, it is characterised in that: in step 104, the value of λ is 2～4。
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CN111355377A (en) * 2018-12-21 2020-06-30 航天科工惯性技术有限公司 Flyback circuit and flyback reset method
CN111682776A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary-side parallel LCD forward converter capable of inhibiting output energy from flowing backwards
CN111682777A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary parallel LCD forward converter capable of avoiding reverse charging of energy storage capacitor
CN111682779A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary-side series-connection LCD (liquid crystal display) excitation energy transfer forward converter capable of restraining output energy backflow
CN111682778A (en) * 2020-06-02 2020-09-18 西安科技大学 Magnetic reset forward converter capable of inhibiting reverse charging of secondary side series LCD energy storage capacitor
CN112886824A (en) * 2021-03-16 2021-06-01 西安科技大学 Positive and negative excitation combined converter with three diodes on secondary side and system
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CN203911758U (en) * 2014-06-12 2014-10-29 安徽理工大学 Self-reset single-end normal shock circuit
CN104242665A (en) * 2014-10-14 2014-12-24 哈尔滨工业大学 ZVZCS interleaving two-tube forward circuit with center-tapped inductor filter

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CN111355377A (en) * 2018-12-21 2020-06-30 航天科工惯性技术有限公司 Flyback circuit and flyback reset method
CN111682779B (en) * 2020-06-02 2022-12-09 西安科技大学 Secondary-side series-connection LCD (liquid crystal display) excitation energy transfer forward converter for restraining output energy backflow
CN111682777A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary parallel LCD forward converter capable of avoiding reverse charging of energy storage capacitor
CN111682779A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary-side series-connection LCD (liquid crystal display) excitation energy transfer forward converter capable of restraining output energy backflow
CN111682778A (en) * 2020-06-02 2020-09-18 西安科技大学 Magnetic reset forward converter capable of inhibiting reverse charging of secondary side series LCD energy storage capacitor
CN111682777B (en) * 2020-06-02 2022-12-09 西安科技大学 Secondary parallel LCD forward converter capable of avoiding reverse charging of energy storage capacitor
CN111682776A (en) * 2020-06-02 2020-09-18 西安科技大学 Secondary-side parallel LCD forward converter capable of inhibiting output energy from flowing backwards
CN111682776B (en) * 2020-06-02 2022-12-09 西安科技大学 Secondary-side parallel LCD forward converter capable of inhibiting output energy from flowing backwards
CN112886824A (en) * 2021-03-16 2021-06-01 西安科技大学 Positive and negative excitation combined converter with three diodes on secondary side and system
CN113014110A (en) * 2021-03-16 2021-06-22 西安科技大学 Forward converter and system of secondary-side parallel LCD circuit
CN113014109A (en) * 2021-03-16 2021-06-22 西安科技大学 Forward converter and system with LC self-reset circuit adopted on secondary side
CN113014109B (en) * 2021-03-16 2022-12-09 西安科技大学 Forward converter and system with LC self-reset circuit adopted on secondary side
CN113014110B (en) * 2021-03-16 2022-12-09 西安科技大学 Forward converter and system of secondary-side parallel LCD circuit

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