CN201733225U - Separated boost converter for realizing forward-flyback by coupling inductances - Google Patents

Separated boost converter for realizing forward-flyback by coupling inductances Download PDF

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Publication number
CN201733225U
CN201733225U CN2009202018362U CN200920201836U CN201733225U CN 201733225 U CN201733225 U CN 201733225U CN 2009202018362 U CN2009202018362 U CN 2009202018362U CN 200920201836 U CN200920201836 U CN 200920201836U CN 201733225 U CN201733225 U CN 201733225U
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China
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diode
power switch
switch pipe
former limit
capacitance
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CN2009202018362U
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何湘宁
赵一
李武华
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a separated boost converter for realizing forward-flyback by coupling inductances, which comprises two power switching tubes, two auxiliary switching tubes, four inverse parallel connection diodes, a switching tube parallel connection capacitor, two clamping capacitors, two switching capacitors, two output diodes and two coupling inductances which are respectively provided with two windings. The utility model realizes zero-voltage switch-on of the power switching tubes by utilizing leakage inductances of the two coupling inductances and resonance of the switching tube parallel connection capacitor, utilizes a clamping circuit consisting of the inverse parallel connection diodes and the clamping capacitors of the switching tubes to absorb the off voltage spike of the switching tubes, which is caused by the leakage inductances, and realize lossless transfer of energy, realizes high gain output of the converter by connecting the second windings of the two coupling inductances in series, utilizes the switching capacitors to further improve the gain of the converter and reduce voltage stress of the output diodes, and realizes zero current switch-off of the output diodes by utilizing the leakage inductances of the coupling inductances.

Description

Coupling inductance realizes positive and negative flyback isolated boost converter
Technical field
The utility model relates to a kind of DC-DC converter and application, is that coupling inductance realizes positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter specifically.
Background technology
In recent years, the pollution of shortage of energy sources and environment has become the focus in the world, and the development of regenerative resource and application are subjected to the extensive concern of countries in the world.In renewable energy system, the electric energy that many regenerative resources are sent all is the lower direct current of voltage, and need the higher direct current of voltage to grid transmission, therefore need DC-DC converter low voltage and direct current to be converted to the high-voltage direct-current that is fit to be incorporated into the power networks, meanwhile, for the personal safety aspect is considered that all there is the requirement of electrical isolation many application scenarios.So low input ripple, high-gain, high efficiency isolated form converter have important effect in regenerative resource is generated electricity by way of merging two or more grid systems the field.
Conventional anti-sharp (flyback) DC-DC converter is simple in structure, be widely used, but the power switch of this converter works in the hard switching state, switching loss is bigger, and the voltage stress of power switch pipe is bigger, and the input current ripple is big, the reverse-recovery problems of output diode is serious, and under the application scenario of high-gain, hypermutation is bigger than the leakage inductance of transformer, has further reduced efficient.Conventional anti-sharp crisscross parallel DC-DC converter has only reduced the ripple of input current to a certain extent, but other problem still exists.Some high-gain isolated DC-DC converter have appearred in recent years in succession, wherein a kind of converter is on the basis of current mode half-bridge topology, increase active clamping circuir and realize the soft switch of power switch pipe, but should topology magnetic element quantity more, influenced power density of transform; Another kind of converter using three winding coupled inductance have been expanded the gain of converter, and have solved the reverse-recovery problems of output diode, but three winding coupled induction structures are comparatively complicated in should topology.
A kind of positive and negative sharp bidirectional DC-DC converter that relates to is disclosed in the Chinese invention patent 200310106349.5, by transformer, elementary winding (N S1With N P1) intercoupling constitutes normal shock transformer (T 1); By another transformer, elementary winding (N S2With N P2) intercoupling constitutes anti-violent change depressor (T 2), two secondary winding (N S1With N S2) tandem tap pipe (S separately 1With S 2) after be parallel to input DC power simultaneously.Two elementary winding (N P1With N P2) connect afterwards by rectification/inverter circuit and DC power supply (V 2) parallel connection.Utilize technology such as active-clamp, RCD clamp, LCD clamp, ZVT reset to form gang's reversible transducer topology.
But this technology still has following deficiency:
1, two power grade differences that transformer is handled cause the loss of transformer to distribute inequality, and the voltage and current stress of power switch pipe is asymmetric, has increased the difficulty of heat management, has influenced the life-span of converter;
2, in this scheme, the normal shock transformer does not need air gap, and anti-violent change depressor need increase than air gaps, has increased the Design for Magnetic Elements complexity, is unfavorable for large-scale industrialization production;
3, in this scheme, the normal shock transformer only transmits energy to secondary when its corresponding switching tube conducting, and anti-violent change depressor only transmits energy to secondary when its corresponding switching tube turn-offs, cause the utilance of transformer not high, increase the volume of transformer, reduced system power density;
4, because the asymmetry of normal shock transformer and anti-violent change depressor is difficult to realize the crisscross parallel work of circuit, influenced the raising of system power grade.
Summary of the invention
The utility model provides a kind of output voltage gain height, and the input current ripple is little, and the simple in structure and coupling inductance noenergy loss realizes positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter.
A kind of coupling inductance realizes positive and negative flyback isolated boost converter, comprises former limit circuit and secondary circuit two parts,
Former limit circuit wherein comprises:
A) first branch road in parallel with power supply, being connected by the first former limit winding and band first power switch pipe anti-and diode constitutes;
B) second branch road in parallel with power supply, being connected by the second former limit winding and band second power switch pipe anti-and diode constitutes;
C) first active clamping circuir is connected in parallel on the first winding two ends, former limit or is connected in parallel on the source electrode, drain electrode of first power switch pipe, and described first active clamping circuir first auxiliary switch and the series connection of first clamping capacitance anti-by band and diode constitute;
D) second active clamping circuir is connected in parallel on the second winding two ends, former limit or is connected in parallel on the source electrode, drain electrode of second power switch pipe, and described second active clamping circuir second auxiliary switch and the series connection of second clamping capacitance anti-by band and diode constitute;
E) first shunt capacitance and/or with first auxiliary switch in parallel three shunt capacitance in parallel with first power switch pipe;
F) second shunt capacitance and/or with second auxiliary switch in parallel four shunt capacitance in parallel with second power switch pipe;
E) and f) shunt capacitance described in the part can be the parasitic capacitance of the switching tube in parallel with it, also can be electric capacity independently.In first branch road or second branch road, each branch road is provided with a shunt capacitance at least, first shunt capacitance is in the source electrode that is connected in parallel on first power switch pipe, the drain electrode when in parallel with first power switch pipe, other shunt capacitances with also be identical connection, promptly be connected in parallel on the power switch pipe or the source electrode of auxiliary switch, drain electrode correspondingly.
Described secondary circuit comprises:
G) coupling inductance series arm;
H) rectification circuit that links to each other with the coupling inductance series arm.
Wherein the coupling inductance series arm is made of the first secondary winding and the second secondary windings in series, wherein the first secondary winding and the described first former limit winding are all two windings in the coupling inductance, and wherein the second secondary winding and the described second former limit winding are all two windings in another coupling inductance.
Serving as with reference to end all in the first former limit winding and the second former limit winding with same that end that extremely links to each other of power supply, to hold pairing end of the same name as second end with the reference of the first former limit winding in the first secondary winding, to hold pairing end of the same name as first end with the reference of the second former limit winding in the second secondary winding, second end of the first secondary winding links to each other with first end of the second secondary winding, realizes the first secondary winding and the second secondary windings in series.
Because the first former limit winding is connected with first power switch pipe in described first branch road, both positions can exchange, when choosing with reference to end, the described first former limit winding links to each other with a certain utmost point (negative or positive electrode) of power supply, both can be directly to link to each other by lead, also can be to link to each other indirectly by first power switch pipe in first branch road.In like manner, the described second former limit winding links to each other with a certain utmost point (negative or positive electrode) of power supply, both can be directly to link to each other by lead, also can be to link to each other indirectly by the second switch pipe in second branch road.
Described rectification circuit is full bridge rectifier, half-wave voltage doubler or full-wave voltage doubler.
Described half-wave voltage doubler comprises the multiplication of voltage electric capacity that is used for constituting with the first secondary winding and the second secondary winding first series arm; Second output diode in parallel with first series arm; Second series arm that constitutes by first output diode and output capacitance in parallel with first series arm; The anode of wherein said first output diode links to each other with the negative electrode of second output diode.
In described first series arm, the first secondary winding, the second secondary winding and multiplication of voltage electric capacity position relation are interchangeable; First output diode and output capacitance position relation can be exchanged in described second series arm; The anode of described first output diode links to each other with the negative electrode of second output diode, can be that the admittance line directly links to each other, and also can be to link to each other indirectly by output capacitance.
For example, described half-wave voltage doubler, specifically can adopt following structure: first end of multiplication of voltage electric capacity links to each other with first end of coupling inductance series arm, second end of multiplication of voltage electric capacity with link to each other with the anode of first output diode and the negative electrode of second output diode, second end of coupling inductance series arm links to each other with first end of the anode of second output diode and output capacitance, and the negative electrode of first output diode links to each other with second end of output capacitance.
First end of described coupling inductance series arm is also second end of the second secondary winding of first end of the first secondary winding both.Second end of described coupling inductance series arm is also first end of the first secondary winding of second end of the second secondary winding both.
Described full-wave voltage doubler, first end of coupling inductance series arm links to each other with the negative electrode of the anode of first output diode and second output diode, second end of coupling inductance series arm links to each other with first end of the first multiplication of voltage electric capacity and first end of the second multiplication of voltage electric capacity, the negative electrode of first output diode links to each other with second end of the first multiplication of voltage electric capacity, the anode of second output diode links to each other with second end of the second multiplication of voltage electric capacity, and the first multiplication of voltage electric capacity and the second multiplication of voltage capacitances in series constitute output capacitance jointly
Described full bridge rectifier, first end of coupling inductance series arm links to each other with the negative electrode of the anode of first output diode and second output diode, second end of coupling inductance series arm links to each other with the negative electrode of the anode of the 3rd output diode and the 4th output diode, the negative electrode of first output diode links to each other with the negative electrode of the 3rd output diode and first end of output capacitance, and the anode of second output diode links to each other with the anode of the 4th output diode and second end of output capacitance.
First auxiliary switch of the anti-and diode of described band first power switch pipe, band anti-and diode second switch pipe, band anti-and diode and band is anti-and second auxiliary switch of diode respectively by constituting behind independent switch pipe and the separate diode reverse parallel connection, or constitute by the switching tube that inside carries anti-and diode.The negative electrode of described anti-and diode with its drain electrode of switching tube in parallel link to each other, described instead also the anode of diode with its source electrode of switching tube in parallel link to each other.
Described first clamping capacitance and second clamping capacitance can be two electric capacity independently, when first clamping capacitance and second clamping capacitance have direct link, can simplify circuit, shared same clamping capacitance.
The drain electrode of described first power switch pipe and second power switch pipe drain electrode link to each other with the positive terminal of power supply respectively; Because first power switch pipe and the first former limit winding position can exchange in first branch road, the drain electrode of first power switch pipe links to each other with the positive terminal of power supply so, both can be directly to link to each other by lead, also can be to link to each other indirectly by the first former limit winding in first branch road.In like manner, the drain electrode of second switch pipe links to each other with the positive terminal of power supply in second branch road, both can be directly to link to each other by lead, also can be to link to each other indirectly by the second former limit winding in second branch road.
The source electrode of the source electrode of described first auxiliary switch and second auxiliary switch links to each other with the drain electrode of first power switch pipe and the drain electrode of second power switch pipe respectively.Owing to constitute at first active clamping circuir, first auxiliary switch and the series connection of first clamping capacitance, and first auxiliary switch and the first clamping capacitance position can exchange, the source electrode of first auxiliary switch both can be directly to link to each other by lead with the drain electrode of first power switch pipe so, also can be to link to each other indirectly by first clamping capacitance.In like manner, the source electrode of second auxiliary switch both can be directly to link to each other by lead with the drain electrode of second power switch pipe, also can be to link to each other indirectly by second clamping capacitance.
In the circuit on former limit, specifically can adopt following layout:
First power switch pipe is in parallel with its reverse parallel connection diode reverse, second power switch pipe is in parallel with its reverse parallel connection diode reverse, first auxiliary switch is in parallel with its reverse parallel connection diode reverse, and second auxiliary switch is in parallel with its reverse parallel connection diode reverse;
First shunt capacitance is in parallel with first power switch pipe, and second shunt capacitance is in parallel with second power switch pipe;
First end of the first former limit winding links to each other with first end of the second former limit winding and the positive terminal of power supply, second end of the first former limit winding links to each other with the source electrode of the drain electrode of first power switch pipe and first auxiliary switch, the drain electrode of first auxiliary switch links to each other with first end of first clamping capacitance, second end of the second former limit winding links to each other with the source electrode of the drain electrode of second power switch pipe and second auxiliary switch, the drain electrode of second auxiliary switch links to each other the source electrode of first power switch pipe with first end of second clamping capacitance, the source electrode of second power switch pipe, second end of first clamping capacitance, second end of second clamping capacitance and the negative pole end of power supply link to each other.
In the utility model, described " linking to each other " refers generally to directly link to each other by lead, only has the specified otherwise part just to think and can directly link to each other indirectly mutually or by other elements by lead.
The utility model is used two coupling inductances and is transmitted energy, each coupling inductance works in the normal shock transformer state when its corresponding power switch pipe conducting, when turn-offing, its corresponding power switch pipe works in anti-violent change depressor state, be each coupling inductance in a switch periods alternation in normal shock transformer and anti-violent change depressor state, in whole switch periods, can transmit energy to secondary continuously, improve the utilance of coupling inductance greatly, reduced the volume and the power density that has improved system of coupling inductance.
In the utility model, gas length parameter in the magnetizing inductance of two coupling inductances, former secondary no-load voltage ratio and the magnetic circuit is identical, and (possible between the components and parts in the reality there is some difference, but this species diversity can not influence the utility model effect), make the voltage and current stress of first power switch pipe and second power switch pipe basic identical, the loss of two coupling inductances divides balanced, the loss basically identical of two power switch pipes makes the thermal design of system simple, makes things convenient for, and has prolonged the life-span of converter.
In the utility model, the magnetizing inductance of two coupling inductances, former secondary no-load voltage ratio parameter are identical, and the consistency of leakage inductance is not had specific (special) requirements, help large-scale industrialization production.
During use initial DC power supply is inserted described converter, then respectively to the control of the control end input control signal of first power switch pipe, second power switch pipe, first auxiliary switch and second auxiliary switch the turning on and off of corresponding switching tube, realize boosting of initial DC power supply.
Wherein, the ON time of first power switch pipe and second power switch pipe equates, phase phasic difference 180 degree, the control signal complementation of first auxiliary switch and first power switch pipe, and a bit of time that common shutoff arranged is as Dead Time, the control signal complementation of second auxiliary switch and second power switch pipe, and a bit of time that common shutoff arranged is as Dead Time.
First opens power switch pipe and the staggered control of second power switch pipe use.Introduce staggered control in the utility model, reduced the ripple of input current, help the raising of system power grade.
During the work of the utility model converter, utilize shunt capacitance to realize the no-voltage shutoff of two power switch pipes and two auxiliary switches; Utilize the leakage inductance of two coupling inductances to realize that the no-voltage of first, second power switch pipe is opened and the zero-current switching of first, second output diode; Utilize first, second auxiliary switch and first, second clamping capacitance to realize the recovery of energy in the leakage inductance of two coupling inductances, realized the harmless operation of active clamping circuir, and the shutoff voltage of first, second power switch pipe of clamp; Utilize the cascaded structure of first, second secondary winding to realize the high-gain output of converter, utilize multiplication of voltage electric capacity, output capacitance further to improve the gain of converter and reduce the voltage stress of first, second output diode.
Coupling inductance of the present utility model realizes positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter, utilize former limit parallel-connection structure to reduce the ripple of input current, utilize the no-voltage of the shunt capacitance realization power switch pipe on the power switch pipe to turn-off, utilize the leakage inductance of coupling inductance to realize that the no-voltage of power switch pipe is open-minded, utilize auxiliary switch and active clamping circuir anti-and diode and clamping capacitance composition thereof to realize the harmless transfer of leakage inductance energy, utilize the cascaded structure of the secondary winding of two coupling inductances to realize the high-gain output of converter, utilize multiplication of voltage electric capacity further to improve the voltage gain of converter and reduced the voltage stress of output diode, circuit structure is simple, all power switch pipes work in soft on off state, noenergy losser in the circuit, improved the efficient of converter, in the commutation course, the overshoot of switching device no-voltage.
Description of drawings
Fig. 1 is the circuit diagram that the utility model coupling inductance realizes positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter;
Fig. 2 a-Fig. 2 c is the circuit diagram of circuit other three kinds of connected modes in the former limit of converter among Fig. 1;
Fig. 3 is the circuit diagram of second kind of connected mode of converter secondary circuit among Fig. 1;
Fig. 4 is the circuit diagram of the third connected mode of converter secondary circuit among Fig. 1;
Fig. 5 is a converter course of work oscillogram among Fig. 1.
Embodiment
Referring to Fig. 1, coupling inductance of the present utility model realizes positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter, comprises former limit circuit and secondary circuit two parts,
Limit, Fig. 1 Central Plains circuit has two branch roads in parallel with power supply, is example with first branch road, by the first former limit winding L 1aWith anti-also first power switch tube S of diode of band 1Series connection constitutes, and first active clamping circuir is connected in parallel on first power switch tube S 1Source electrode, drain electrode on, first active clamping circuir is anti-and diode D by band C1The first auxiliary switch S C1With the first clamping capacitance C C1Series connection constitutes.
Concrete connection is as follows: first power switch tube S in the circuit of former limit 1With its reverse parallel connection diode D 1Reverse parallel connection, second power switch tube S 2With its reverse parallel connection diode D 2Reverse parallel connection, the first auxiliary switch S C1With its reverse parallel connection diode D C1Reverse parallel connection, the second auxiliary switch S C2With its reverse parallel connection diode D C2Reverse parallel connection, the anode of reverse parallel connection diode links to each other with the source electrode of power switch pipe or auxiliary switch, and the negative electrode of reverse parallel connection diode links to each other with the drain electrode of power switch pipe or auxiliary switch;
Shunt capacitance C P1With first power switch tube S 1Parallel connection, shunt capacitance C P2With second power switch tube S 2Parallel connection, an end of two shunt capacitances link to each other with the drain electrode of corresponding power switch pipe respectively, and the other end of two shunt capacitances links to each other with the source electrode of corresponding power switch pipe respectively;
The first former limit winding L 1aAn end and the second former limit winding L 2aAn end and power supply V InAnode link to each other the first former limit winding L 1aThe other end and first power switch tube S 1The drain electrode and the first auxiliary switch S C1Source electrode link to each other the first auxiliary switch S C1The drain electrode and the first clamping capacitance C C1An end link to each other the second former limit winding L 1bThe other end and second power switch tube S 2The drain electrode and the second auxiliary switch S C2Source electrode link to each other the second auxiliary switch S C2The drain electrode and the second clamping capacitance C C2An end link to each other first power switch tube S 1Source electrode, second power switch tube S 2Source electrode, the first clamping capacitance C C1The other end, the second clamping capacitance C C2The other end and power supply V InNegative terminal link to each other.
Secondary circuit comprises coupling inductance series arm and rectification circuit, and energy sends load R to from rectification circuit output end L, the output voltage of rectification circuit is V Out
The coupling inductance series arm is by the first secondary winding L 1bWith the second secondary winding L 2bSeries connection constitutes, wherein the first secondary winding L 1bWith the described first former limit winding L 1aBe all two windings in first coupling inductance, wherein the second secondary winding L 2bWith the described second former limit winding L 2aBe all two windings in second coupling inductance; Among the figure by " △ " mark one first former limit winding L 1aWith the first secondary winding L 1bEnd of the same name, by " o " mark one first former limit winding L 2aWith the first secondary winding L 2bEnd of the same name.
Rectification circuit adopts half-wave voltage doubler, the first secondary winding L 1b" △ " end with the second secondary winding L 2b" o " end link to each other the first secondary winding L 1bThe other end and multiplication of voltage capacitor C sAn end link to each other the multiplication of voltage capacitor C sThe other end and the first output diode D O1The anode and the second output diode D O2Negative electrode link to each other the second secondary winding L 2bThe other end and the second output diode D O2Anode and output capacitance C oAn end link to each other the first output diode D O1Negative electrode and output capacitance C oThe other end link to each other.
Shown in Fig. 2 a-Fig. 2 c, there are other three kinds of connected modes in the former limit circuit of converter, shown in Fig. 2 a, is that with former limit circuit difference among Fig. 1 first clamp circuit is parallel to the first former limit winding L 1aTwo ends, second clamp circuit is parallel to the second former limit winding L 2aTwo ends; Shown in Fig. 2 b, be the first clamping capacitance C with former limit circuit difference among Fig. 1 C1With the second clamping capacitance C C2Be same capacitor C cShown in Fig. 2 c, be the first clamping capacitance C with former limit circuit difference among Fig. 2 b C1With the second clamping capacitance C C2Be same capacitor C c
As shown in Figure 3, be that with secondary circuit difference among Fig. 1 the secondary circuit of converter adopts full-wave voltage doubler, the first secondary winding L 1bAn end and the second secondary winding L 2bAn end link to each other the first secondary winding L 1bThe other end and the first output diode D O1The anode and the second output diode D O2Negative electrode link to each other the second secondary winding L 2bThe other end and the first output capacitance C O1An end and output capacitance C O2An end link to each other the first output diode D O1The negative electrode and the first output capacitance C O1The other end link to each other the second output diode D O2The anode and the second output capacitance C O2The other end link to each other the first output capacitance C in this connected mode O1With the second output capacitance C O2Series connection back common formation output capacitance.
As shown in Figure 4, be that with secondary circuit difference among Fig. 1 the secondary circuit of converter adopts full bridge rectifier, the first secondary winding L 1bAn end and the second secondary winding L 2bAn end link to each other the first secondary winding L 1bThe other end and the first output diode D O1The anode and the second output diode D O2Negative electrode link to each other the second secondary winding L 2bThe other end and the 3rd output diode D O3Anode and the 4th output diode D O4Negative electrode link to each other the first output diode D O1Negative electrode and the 3rd output diode D O3Negative electrode and output capacitance C oAn end link to each other the second output diode D O2Anode and the 4th output diode D O4Anode and output capacitance C oThe other end link to each other.
When utilizing the utility model converter boost, initial DC power supply is inserted converter, then respectively to the control of the control end input control signal of first power switch pipe, second power switch pipe, first auxiliary switch and second auxiliary switch the turning on and off of corresponding switching tube, realize boosting of initial DC power supply.
Wherein, the ON time of first power switch pipe and second power switch pipe equates, phase phasic difference 180 degree, the control signal complementation of first auxiliary switch and first power switch pipe, and the Dead Time of common shutoff arranged, the control signal complementation of second auxiliary switch and second power switch pipe, and the Dead Time of common shutoff is arranged.
Coupling inductance realizes that positive and negative flyback isolated active clamping stagger parallel connection voltage boosting-type converter exists four kinds of courses of work (course of work of Fig. 1~converter shown in Figure 4 is basic identical), i.e. first power switch tube S 1Turn-off and the first auxiliary switch S C1Commutation course between opening; The first auxiliary switch S C1Turn-off and first power switch tube S 1Commutation course between opening; Second power switch tube S 2Turn-off and the second auxiliary switch S C2Commutation course between opening; The second auxiliary switch S C2Turn-off and second power switch tube S 2Commutation course between opening.With Fig. 1 is the course of work that example illustrates converter:
First power switch tube S 1Turn-off and the first auxiliary switch S C1Commutation course between opening:
Before the change of current, circuit is in first power switch tube S 1Conducting, the anti-and diode D of first power switch pipe 1Turn-off second power switch tube S 2Conducting, the anti-and diode D of second power switch pipe 2Turn-off the first auxiliary switch S C1And anti-and diode D C1Turn-off the second auxiliary switch S C2And anti-and diode D C2Turn-off the first output diode D O1With the second output diode D O2The steady-working state that turn-offs.When first power switch tube S 1During shutoff, on the former limit of converter, because switching tube shunt capacitance C P1Effect, first power switch tube S 1Voltage start from scratch and rise, therefore first power switch tube S so that certain slope is linear 1Realized the no-voltage shutoff.When first power switch tube S 1Voltage surpass the first clamping capacitance C C1Voltage the time, the anti-and diode D of first auxiliary switch C1The first clamping capacitance C is transferred in conducting, the energy in the leakage inductance of first coupling inductance C1In, at the anti-and diode D of first auxiliary switch C1Provide the first auxiliary switch S after the conducting C1Open signal, and realized the first auxiliary switch S C1No-voltage open-minded, the anti-and diode D of first auxiliary switch C1Deactivate.In this process, at the secondary of converter, the first output diode D O1The beginning conducting, for the circuit that Fig. 1 shows, energy is from first, second coupling inductance and multiplication of voltage capacitor C sIn output to output capacitance C oIn, for circuit shown in Figure 3, energy outputs to the first output capacitance C from first, second coupling inductance O1In, for circuit shown in Figure 4, energy outputs to output capacitance C from first, second coupling inductance oIn, afterwards, circuit has entered first power switch tube S 1Turn-off the first auxiliary switch S C1Open-minded, the first output diode D O1The steady-working state of opening.
The first auxiliary switch S C1Turn-off and first power switch tube S 1Commutation course between opening:
Before the change of current, the leakage inductance of coupling inductance and the first clamping capacitance C C1Be in resonance condition.As the first auxiliary switch S C1During shutoff, on the former limit of converter, the first clamping capacitance C C1Withdraw from resonance, the shunt capacitance C of the leakage inductance of coupling inductance and switching tube P1Beginning resonance is along with shunt capacitance C P1The decline of voltage, the first auxiliary switch S C1Voltage start from scratch rising, the i.e. first auxiliary switch S C1Realized the no-voltage shutoff.While first power switch tube S 1Voltage with the first auxiliary switch S C1The rising of voltage and descending is when first power switch tube S 1Voltage when dropping to zero, the anti-and diode D of first power switch pipe 1The beginning conducting provides first power switch tube S this moment 1Continuity signal, realized first power switch tube S 1No-voltage open-minded, first power switch tube S 1Anti-and diode D 1Deactivate.At the converter secondary, the first output diode D O1Electric current begin to descend by a certain value so that certain slope is linear, as the first output diode D O1Electric current when dropping to zero, the first output diode D O1Turn-off, promptly realized the first output diode D O1Zero-current switching, alleviated electromagnetic compatibility and the loss problem brought owing to diode reverse recovery, afterwards, circuit has entered first power switch tube S 1Conducting, the first auxiliary switch S C1Turn-off the first output diode D O1The steady-working state that turn-offs.
Second power switch tube S 2Turn-off and the second auxiliary switch S C2Commutation course between opening:
In second power switch tube S 2Turn-off and the second auxiliary switch S C2In the commutation course between opening, because symmetry, the commutation course on the former limit of converter and first power switch tube S of circuit 1Turn-off and the first auxiliary switch S C1Commutation course between opening is similar.At the secondary of converter, the second output diode D O2The beginning conducting, for circuit shown in Figure 1, energy outputs to the multiplication of voltage capacitor C from first, second coupling inductance sIn, for circuit shown in Figure 3, energy outputs to the output second output capacitance C from first, second coupling inductance O2In, for circuit shown in Figure 4, energy outputs to output capacitance C from first, second coupling inductance oIn, afterwards, circuit has entered second power switch tube S 2Turn-off the second auxiliary switch S C2Open-minded, the second output diode D O2The steady-working state of opening.
The second auxiliary switch S C2Turn-off and second power switch tube S 2Commutation course between opening:
Since the symmetry of circuit, the second auxiliary switch S C2Shutoff, second power switch tube S 2The commutation course between opening and the first auxiliary switch S C1Shutoff, first power switch tube S 1Commutation course between opening is similar.
Fig. 5 is the portion waveshape figure in the circuit working process among Fig. 1, the i among the figure Lk1, i Lk2Be respectively former limit first winding L 1a, former limit second winding L 2aIn current waveform, v Ds1, v Ds2Be respectively first power switch tube S 1, the second power switch S 2Voltage waveform between pipe drain electrode and the source electrode, i S1, i S2Be divided into first power switch tube S 1, second power switch tube S 2In current waveform, v Cc1, v Cc2Be respectively the first clamping capacitance C C1, the second clamping capacitance C C2Voltage waveform, i Cc1, i Cc2Be respectively the first clamping capacitance C C1, the second clamping capacitance C C2Current waveform, i Do1, i Do2Be respectively the first output diode D O1, the second output diode D O2Current waveform; T among the figure 1To t 16Represent the time point in the switch periods, t 1~t 4It in time first power switch tube S 1Turn-off and the first auxiliary switch S C1Commutation course between opening, t 5~t 8In time the first auxiliary switch S C1Turn-off and first power switch tube S 1Commutation course between opening, t 9~t 12It in time second power switch tube S 2Turn-off and the second auxiliary switch S C2Commutation course between opening, t 13~t 16In time the second auxiliary switch S C2Turn-off and second power switch tube S 2Commutation course between opening.

Claims (9)

1. a coupling inductance realizes positive and negative flyback isolated boost converter, comprises former limit circuit and secondary circuit, it is characterized in that,
Described former limit circuit comprises:
A) first branch road in parallel with power supply is by the first former limit winding (L 1a) the anti-and diode (D with band 1) the first power switch pipe (S 1) the series connection formation;
B) second branch road in parallel with power supply is by the second former limit winding (L 2a) the anti-and diode (D with band 2) the second power switch pipe (S 2) the series connection formation;
C) first active clamping circuir is connected in parallel on the first former limit winding (L 1a) two ends or be connected in parallel on the first power switch pipe (S 1) source electrode, drain electrode on, described first active clamping circuir is anti-and diode (D by band C1) the first auxiliary switch (S C1) and the first clamping capacitance (C C1) the series connection formation;
D) second active clamping circuir is connected in parallel on the second former limit winding (L 2a) two ends or be connected in parallel on the second power switch pipe (S 2) source electrode, drain electrode on, described second active clamping circuir is anti-and diode (D by band C2) the second auxiliary switch (S C2) and the second clamping capacitance (C C2) the series connection formation;
E) with the first power switch pipe (S 1) in parallel first shunt capacitance and/or with the first auxiliary switch (S C1) the 3rd shunt capacitance in parallel;
F) with the second power switch pipe (S 2) in parallel second shunt capacitance and/or with the second auxiliary switch (S C2) the 4th shunt capacitance in parallel;
Described secondary circuit comprises:
G) coupling inductance series arm is by the first secondary winding (L 1b) and the second secondary winding (L 2b) series connection formation, the wherein first secondary winding (L 1b) and the described first former limit winding (L 1a) be all two windings in the coupling inductance, the wherein second secondary winding (L 2b) and the described second former limit winding (L 2a) be all two windings in another coupling inductance; With the first former limit winding (L 1a) and the second former limit winding (L 2a) in all with power supply (V In) same that end that extremely links to each other be with reference to holding the first secondary winding (L 1b) and the second secondary winding (L 2b) in respectively with the first former limit winding (L 1a) and the second former limit winding (L 2a) in the end of the same name with reference to end link to each other;
H) rectification circuit that links to each other with described coupling inductance series arm.
2. coupling inductance as claimed in claim 1 realizes positive and negative flyback isolated boost converter, it is characterized in that, described rectification circuit is full bridge rectifier, half-wave voltage doubler or full-wave voltage doubler.
3. coupling inductance as claimed in claim 2 realizes positive and negative flyback isolated boost converter, it is characterized in that, described half-wave voltage doubler comprises:
Be used for and the first secondary winding (L 1b) and the second secondary winding (L 2b) constitute the multiplication of voltage electric capacity (C of first series arm s);
Second output diode (the D in parallel with first series arm O2);
In parallel with first series arm by the first output diode (D O1) and output capacitance (C o) second series arm that constitutes, the wherein said first output diode (D O1) the anode and the second output diode (D O2) negative electrode link to each other.
4. coupling inductance as claimed in claim 2 realizes positive and negative flyback isolated boost converter, it is characterized in that, and in the described full-wave voltage doubler, first end of coupling inductance series arm and the first output diode (D O1) the anode and the second output diode (D O2) negative electrode link to each other second end of coupling inductance series arm and the first multiplication of voltage electric capacity (C S1) first end and the second multiplication of voltage electric capacity (C S2) first end link to each other the first output diode (D O1) the negative electrode and the first multiplication of voltage electric capacity (C S1) second end link to each other the second output diode (D O2) the anode and the second multiplication of voltage electric capacity (C S2) second end link to each other the first multiplication of voltage electric capacity (C S1) and the second multiplication of voltage electric capacity (C S2) the common formation of series connection output capacitance.
5. coupling inductance as claimed in claim 2 realizes positive and negative flyback isolated boost converter, it is characterized in that, and in the described full bridge rectifier, first end of coupling inductance series arm and the first output diode (D O1) the anode and the second output diode (D O2) negative electrode link to each other second end of coupling inductance series arm and the 3rd output diode (D O3) anode and the 4th output diode (D O4) negative electrode link to each other the first output diode (D O1) negative electrode and the 3rd output diode (D O3) negative electrode and output capacitance (C o) first end link to each other the second output diode (D O2) anode and the 4th output diode (D O4) anode and output capacitance (C o) second end link to each other.
6. coupling inductance as claimed in claim 1 realizes positive and negative flyback isolated boost converter, it is characterized in that, and is described: the anti-and diode (D of band 1) the first power switch pipe (S 1), the anti-and diode (D of band 2) the second power switch pipe (S 2), the anti-and diode (D of band C1) the first auxiliary switch (S C1) and band is anti-and diode (D C2) the second auxiliary switch (S C2) respectively by constituting behind independent switch pipe and the separate diode reverse parallel connection, or constitute by the switching tube that inside carries anti-and diode.
7. coupling inductance as claimed in claim 1 realizes positive and negative flyback isolated boost converter, it is characterized in that, the described first clamping capacitance (C C1) and the second clamping capacitance (C C2) be same electric capacity.
8. coupling inductance as claimed in claim 1 realizes positive and negative flyback isolated boost converter, it is characterized in that, the described first power switch pipe (S 1) the drain electrode and the second power switch pipe (S 2) drain electrode respectively with power supply (V In) positive terminal link to each other; First auxiliary switch (the S C1) the source electrode and the second auxiliary switch (S C2) source electrode respectively with the first power switch pipe (S 1) the drain electrode and the second power switch pipe (S 2) drain electrode link to each other.
9. coupling inductance as claimed in claim 8 realizes positive and negative flyback isolated boost converter, it is characterized in that, and in the circuit on described former limit, the first power switch pipe (S 1) and its reverse parallel connection diode (D 1) reverse parallel connection, the second power switch pipe (S 2) and its reverse parallel connection diode (D 2) reverse parallel connection, the first auxiliary switch (S C1) and its reverse parallel connection diode (D C1) reverse parallel connection, the second auxiliary switch (S C2) and its reverse parallel connection diode (D C2) reverse parallel connection;
First shunt capacitance (the C P1) and the first power switch pipe (S 1) parallel connection, the second shunt capacitance (C P2) and the second power switch pipe (S 2) parallel connection;
The first former limit winding (L 1a) first end and the second former limit winding (L 2a) first end and power supply (V In) positive terminal link to each other the first former limit winding (L 1a) second end and the first power switch pipe (S 1) the drain electrode and the first auxiliary switch (S C1) source electrode link to each other the first auxiliary switch (S C1) the drain electrode and the first clamping capacitance (C C1) first end link to each other the second former limit winding (L 2a) second end and the second power switch pipe (S 2) the drain electrode and the second auxiliary switch (S C2) source electrode link to each other the second auxiliary switch (S C2) the drain electrode and the second clamping capacitance (C C2) first end link to each other the first power switch pipe (S 1) source electrode, the second power switch pipe (S 2) source electrode, the first clamping capacitance (C C1) second end, the second clamping capacitance (C C2) second end and power supply (V In) negative pole end link to each other.
CN2009202018362U 2009-12-07 2009-12-07 Separated boost converter for realizing forward-flyback by coupling inductances Expired - Fee Related CN201733225U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702578B (en) * 2009-12-07 2012-01-11 浙江大学 Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof
CN104682714A (en) * 2015-03-13 2015-06-03 浙江昱能科技有限公司 Direct current converter
CN106100324A (en) * 2016-06-28 2016-11-09 西华大学 High-gain DC booster converter based on the positive clamper of diode
CN106787756A (en) * 2016-12-29 2017-05-31 天津大学 A kind of CL FT CL resonance DC converters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702578B (en) * 2009-12-07 2012-01-11 浙江大学 Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof
CN104682714A (en) * 2015-03-13 2015-06-03 浙江昱能科技有限公司 Direct current converter
CN104682714B (en) * 2015-03-13 2017-04-05 浙江昱能科技有限公司 Direct current transducer
CN106100324A (en) * 2016-06-28 2016-11-09 西华大学 High-gain DC booster converter based on the positive clamper of diode
CN106787756A (en) * 2016-12-29 2017-05-31 天津大学 A kind of CL FT CL resonance DC converters
CN106787756B (en) * 2016-12-29 2019-06-28 天津大学 A kind of CL-FT-CL resonance DC converter

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