CN100481694C - Soft switching phase-shift full bridge circuit - Google Patents
Soft switching phase-shift full bridge circuit Download PDFInfo
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- CN100481694C CN100481694C CNB2006100763817A CN200610076381A CN100481694C CN 100481694 C CN100481694 C CN 100481694C CN B2006100763817 A CNB2006100763817 A CN B2006100763817A CN 200610076381 A CN200610076381 A CN 200610076381A CN 100481694 C CN100481694 C CN 100481694C
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Abstract
The disclosed phase-shift full bridge circuit for flexible switch comprises: a transformer, a lead/lag bridge arm connected with one/another end of the primary side of transformer, an auxiliary bridge arm connected with power end, a break capacitor between primary side of transformer and the lead arm, and an output circuit set on secondary side of the transformer. This invention makes both the lead and lag arm fit to zero voltage switch, and turns off the rectifying diode with zero voltage.
Description
Technical field
The present invention relates to a kind of phase-shift full bridge circuit of soft switching, particularly relate to a kind of leading-bridge, lagging leg of making and all be easy to realize zero voltage switching, and effectively solve the phase-shift full bridge circuit of the soft switching of output rectifier diode reverse-recovery problems.
Background technology
Seeing also shown in Figure 19ly, is a kind of existing phase-shift full bridge circuit, and it includes: a transformer 70; One leading-bridge 71 is made up of two electric crystal M1, M2, and the connected node of this two electric crystal M1, M2 is to be connected with an end of transformer 70 primary sides; One lagging leg 72 is made up of two electric crystal M3, M4, and the connected node of this two electric crystal M3, M4 is to be connected with the end in addition of transformer 70 primary sides; One resonant inductance Ls is to be serially connected with between the connected node and transformer 70 primary sides of two electric crystal M1, M2 in the leading-bridge 71; One output circuit 73 is to be located on the secondary side of transformer 70, mainly is made up of rectifier diode D5, D6, outputting inductance L5 and output capacitance C0 etc.
Two electric crystal M1, the M2 in the aforementioned leading-bridge 71 and two electric crystal M3, the M4 of lagging leg 72 constitute complementary conducting with 180 degree, and the conducting of leading-bridge 71 and lagging leg 72 is to differ a phase place, so be called phase shift.And the drive signal of leading-bridge 71 liang of electric crystal M1, M2 is to lead over two electric crystal M3, the M4 of lagging leg 72 respectively.
Compare with traditional full-bridge circuit, aforesaid full-bridge circuit is serially connected with a resonant inductance Ls between transformer 70 primary sides and 71 liang of electric crystal M1 of leading-bridge, M2 connected node.As the design that is can make lagging leg 72 liang of electric crystal M3, M4 realize zero voltage switching at wide loading range, yet the problem of deriving be because of the resonant inductance Ls loss that adds big, and make effective duty-cycle loss of circuit serious, the reverse-recovery problems of transformer 70 secondary side rectifier diodes does not also achieve a solution in addition.
Seeing also shown in Figure 20ly, is another known phase-shift full bridge circuit, and its basic framework and Figure 19 are roughly the same, and it is to be serially connected with between transformer 70 secondary sides and the rectifier diode D5 that difference is in resonant inductance Ls.This kind Variant Design existing problems are identical with the 19 figure, all are that loss is big after adding inductance, and the reverse-recovery problems of unresolved rectifier diode.
Seeing also shown in Figure 21ly, is another known phase-shift full bridge circuit, and its basic framework and Figure 19 are roughly the same, and difference is in has increased by two clamping diode D7, D8 on transformer 70 primary sides.Though this kind design can reduce the due to voltage spikes of rectifier diode because of oppositely recovering to produce on transformer 70 secondary sides effectively, but still there are problems such as institute's coilloading loss is big, duty-cycle loss is serious in this circuit, and the reverse recovery of transformer 70 secondary side rectifier diodes does not also improve fully.
From the above, existing phase-shift full bridge circuit ubiquity adds behind the resonant inductance line loss and becomes big and the rectifier diode reverse-recovery problems does not obtain problems such as improvement fully, in addition, the lagging leg 72 electric crystal M3 of described full-bridge circuit, M4 realizes that zero voltage switching is comparatively difficult, after reason is that electric crystal ends, transformer 70 secondary sides are by short circuit, reflex to the load current of primary side and have neither part nor lot in electric crystal M3, the last parasitic capacitance C3 of M4, C4 discharges and recharges, only rely on energy stored in transformer 70 leakage inductances, two electric crystal M3, M4 promptly is difficult to realize zero voltage switching.
Above-mentioned existing phase-shift full bridge circuit obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that phase-shift full bridge circuit exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing phase-shift full bridge circuit exists, the design people is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, phase-shift full bridge circuit in the hope of the soft switching of founding a kind of new structure, can improve general existing phase-shift full bridge circuit, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Main purpose of the present invention is, overcome inconvenience and defective that above-mentioned existing phase-shift full bridge circuit exists, and provide a kind of phase-shift full bridge circuit of soft switching of new structure, technical problem to be solved is to make it effectively reduce line loss, be easy to realize zero voltage switching, and effectively solve output rectifier diode reverse-recovery problems, thereby be suitable for practicality more.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.The phase-shift full bridge circuit of a kind of soft switching that proposes according to the present invention, it comprises: a transformer; One leading-bridge is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with an end of transformer primary side; One lagging leg is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with the end in addition of transformer primary side; One blocking capacitor is serially connected with between the connected node and transformer primary side of two electric crystals in the leading-bridge; One auxiliary brachium pontis is made up of with an inductance that is connected at least one electric capacity, and this electric capacity one end is connected with power supply, and end is connected with the transformer primary side by inductance in addition; And an output circuit, be located on the secondary side of transformer.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said auxiliary brachium pontis is made up of two electric capacity and an inductance, two electric capacity be interconnect and cross-over connection on power end, its two connected node is connected with the transformer primary side by inductance.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said auxiliary brachium pontis is made up of electric capacity and inductance, and electric capacity one end is connected with power end, and end is connected with the transformer primary side by inductance in addition.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said auxiliary brachium pontis further is provided with another inductance, and it is connected between two electric capacity connected nodes and the blocking capacitor.
The phase-shift full bridge circuit of aforesaid soft switching, the full-wave rectifying circuit that wherein said output circuit is made up of two rectifier diodes, an outputting inductance, an output capacitance etc.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said outputting inductance are to be serially connected with between Circuit Fault on Secondary Transformer and the output anode.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said outputting inductance are to be serially connected with between Circuit Fault on Secondary Transformer and the output negative terminal.
The phase-shift full bridge circuit of aforesaid soft switching, wherein said output circuit is made up of a bridge rectifier, an outputting inductance, an output capacitance etc.
The phase-shift full bridge circuit of aforesaid soft switching is serially connected with a resonant inductance between wherein said transformer primary side and the blocking capacitor.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, the technological means that the present invention used is to provide a kind of phase-shift full bridge circuit of soft switching, includes: a transformer; One leading-bridge is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with an end of transformer primary side; One lagging leg is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with the end in addition of transformer primary side; One blocking capacitor is to be serially connected with between the connected node and transformer primary side of two electric crystals in the leading-bridge; One resonant inductance is to be serially connected with between transformer primary side and the blocking capacitor, and an auxiliary brachium pontis is made up of with an inductance that is connected at least one electric capacity, and this electric capacity one end is connected with power supply, and end is connected with the transformer primary side by inductance in addition; One output circuit is to be located on the secondary side of transformer, is made up of at least two rectifier diodes, an outputting inductance, an output capacitance etc.
In the aforementioned circuit design, be to utilize auxiliary brachium pontis storage power by the back its parasitic capacitance to be discharged and recharged, so that be easier to realize zero voltage switching at the lagging leg electric crystal; Moreover, because the adding of blocking capacitor, except that preventing the transformer bias, and provide a voltage to force a rectifier diode conducting in the circulation incipient stage, thereby with the Circuit Fault on Secondary Transformer short circuit in winding, blocking capacitor and resonant inductance begin resonance, make the primary side current conversion negative.And secondary side current is shifted to another rectifier diode by a rectifier diode, and after transfer was finished, the rectifier diode of transfer current realized that zero current switches, thereby can effectively suppress the reverse-recovery problems of Circuit Fault on Secondary Transformer rectifier diode.
Aforesaid auxiliary brachium pontis is made up of two electric capacity and an inductance, two electric capacity be interconnect and cross-over connection on power end, its two connected node is connected with the transformer primary side by inductance.
Aforementioned resonant inductance is an independent inductance element.
Aforementioned resonant inductance is to utilize the leakage inductance of transformer to constitute.
Aforementioned output circuit is a full-wave rectifying circuit.
Aforementioned output circuit is a bridge rectifier.
By technique scheme, the phase-shift full bridge circuit of the soft switching of the present invention has following advantage at least:
Phase-shift full bridge circuit about a kind of soft switching of the present invention, include leading-bridge, that a transformer, is connected in transformer primary side one end be connected in the transformer primary side in addition the lagging leg, of the end auxiliary brachium pontis, that is connected in power end be serially connected with the output circuit that blocking capacitor and between transformer primary side and the leading-bridge is located at Circuit Fault on Secondary Transformer; Wherein, this auxiliary brachium pontis is by making two electric capacity cross-over connections in power end, and the connected node between two electric capacity is the primary side that is connected to transformer by an inductance.The aforementioned circuit design is easy to reach the zero voltage switching except that leading-bridge, and the electric current that utilizes auxiliary brachium pontis to provide can make lagging leg also be easy to reach zero voltage switching; The adding of blocking capacitor again not only can prevent transformer bias, also can with auxiliary brachium pontis acting in conjunction, make that the output rectifier diode is realized zero-current switching in the output circuit, thereby be suitable for practicality more.
In sum, the phase-shift full bridge circuit of the soft switching of special construction of the present invention, it has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing phase-shift full bridge circuit has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the detailed circuit diagram of the present invention's first preferred embodiment.
Fig. 2 is the work period sequential chart of the present invention's first preferred embodiment.
Fig. 3-Figure 12 is the detailed circuit diagram that the present invention's first preferred embodiment indicates direction of current flow symbol in the work period.
Figure 13 is the detailed circuit diagram of the present invention's second preferred embodiment.
Figure 14 is the detailed circuit diagram of the present invention's the 3rd preferred embodiment.
Figure 15 is the detailed circuit diagram of the present invention's the 4th preferred embodiment.
Figure 16 is the detailed circuit diagram of the present invention's the 5th preferred embodiment.
Figure 17 is the detailed circuit diagram of the present invention's the 6th preferred embodiment.
Figure 18 is the detailed circuit diagram of the present invention's the 7th preferred embodiment.
Figure 19 is a kind of detailed circuit diagram of known phase-shift full bridge circuit.
Figure 20 is the detailed circuit diagram of another known phase-shift full bridge circuit.
Figure 21 is the detailed circuit diagram of another known phase-shift full bridge circuit.
10: transformer 11: leading-bridge
12: lagging leg 13: output circuit
20: auxiliary brachium pontis
70: transformer 71: leading-bridge
72: lagging leg 73: output circuit
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of phase-shift full bridge circuit, structure, feature and the effect thereof of the soft switching that foundation the present invention is proposed, describe in detail as after.
As shown in Figure 1, disclose the detailed circuit diagram that the present invention's one preferable enforcement is arranged, it includes:
Symbol NP is the umber of turn of primary side among one transformer, 10 figure, and NS1, NS2 are the secondary side winding number of turn, and n=NP/NS1=NP/NS2;
One leading-bridge 11 is made up of two electric crystal M1, M2, and the connected node of this two electric crystal M1, M2 is to be connected with an end of transformer 10 primary sides;
One lagging leg 12 is made up of two electric crystal M3, M4, and the connected node of this two electric crystal M3, M4 is to be connected with the end in addition of transformer 10 primary sides;
One blocking capacitor C8 is to be serially connected with between the connected node and transformer 10 primary sides of two electric crystal M1, M2 in the leading-bridge 11;
One resonant inductance Ls is to be serially connected with between transformer 10 primary sides and the blocking capacitor C8;
One auxiliary brachium pontis 20 is made up of two capacitor C 6, C7 and an inductance L 7, two capacitor C 6, C7 be interconnect and cross-over connection on power end Vin, the connected node of two capacitor C 6, C7 is to be connected with transformer 10 primary sides by inductance L 7;
One output circuit 13 is to be located on the secondary side of transformer 10, mainly is made up of rectifier diode D5, D6, outputting inductance L5 and output capacitance C0 etc.
And for example shown in Figure 2, be the theoretical waveform of aforementioned full-bridge circuit main element in a work period, below sincerely further specify as the back with regard to the operation principle in aforementioned full-bridge circuit each stage in this cycle:
T0～t1 stage
Please cooperate and consult the sense of current that Fig. 3 indicates, before t0, the body diode D3 conducting (i of electric crystal M1, electric crystal M3
L7IP), electric crystal M3 lets out in the source voltage clamp at utmost point two ends at 0V.At t0 constantly, electric crystal M3 no-voltage is open-minded, and the voltage Vac that is applied to inductance L7 two ends on the auxiliary brachium pontis 20 this moment is Vin/2, makes i
L7Begin to reduce and oppositely increase the current i of the electric crystal M3 that flows through
D (M3)=i
P-i
L7, transformer 10 primary side currents pass through the rectifier diode D5 of transformer 10, output circuit 13 to load transfer power.
T1～t2 stage
As shown in Figure 4.When t1, reaching no-voltage under the effect of electric crystal M1 two capacitor C 1, C2 in leading-bridge 10 turn-offs, this moment reflexes to the electric current I o/n of transformer 10 primary sides and the exciting curent of transformer 10 begins jointly the capacitor C in the leading-bridge 11 1 to be charged, and another capacitor C 2 discharged, and electric crystal M1 source is let out the voltage at utmost point two ends and is begun to rise, and the voltage (b point voltage) that electric crystal M2 lets out in the source utmost point two ends begins to descend.
T2～t3 stage
As shown in Figure 5.When t2, the voltage that electric crystal M1 lets out in the source utmost point two ends rises to Vin, and the voltage that electric crystal M2 lets out in the source utmost point two ends drops to 0V, is clamped at 0V (conduction voltage drop of ignoring electric crystal M2 upper body diode D2) simultaneously, for electric crystal M2 no-voltage is opened the condition of foundation.From t2, rectifier diode D5, D6 begin the change of current, and transformer 10 secondary sides are by short circuit, and cut-out transformer 10 secondary side antis are mapped to the inductance n of transformer 10 primary sides
2L5, transformer 10 primary side current i
PAt V
C8Under the effect, with V
C8/ L
SSpeed begin to reduce.
T3～t4 stage
As Fig. 6, shown in Figure 7.When t3, electric crystal M2 no-voltage is open-minded, and transformer transformer 10 secondary sides are still by short circuit, and transformer 10 primary side currents continue with V
C8/ L
SSpeed descend and oppositely increase.
T4～t5 stage
As shown in Figure 8.When t4, transformer 10 primary side currents oppositely increase to Io/n, and the electric current of the rectifier diode D5 that flows through is reduced to zero and begins reverse increase, and the electric current of another rectifier diode D6 increases to Io; Transformer 10 primary side current rates of descent are V
C8/ L
S, the electric current rate of descent of rectifier diode D5 is (n/2) * (V
C8/ L
S), the current-rising-rate of another rectifier diode D6 is (n/2) * (V
C8/ L
S).
Preceding taking off in the prior art, each other electric current rate of descent of rectifier diode D5, the D6 of output circuit 73 shown in Figure 19 and climbing are (n/2) * (Vin/L
S), and
, cause the reverse recovery of rectifier diode D5 and corresponding negative effect stronger, by improvement design of the present invention, the electric current rate of descent of rectifier diode D5 reduces in the output circuit 13, and it means that reverse recovery Effects is effectively suppressed.
T5～t6 stage
As shown in Figure 9.When t5, the reverse recovery current of rectifier diode D5 of flowing through reaches maximum and begins rapid decline, and rectifier diode D5 begins to recover blocking-up, its electric current rate of descent di/dt, and stray inductance in the line (general sensibility reciprocal is less) goes up due to voltage spikes of generation, this due to voltage spikes and 2 * (V
C8/ n) phase superposition forms the reverse voltage of rectifier diode D5.Section at this moment, the current direction in the circuit and t4～t5 stage is in full accord, and just transformer 10 primary side currents fall after rise rapidly from peak value, reach Io/n at last, thus rectifier diode D5 and D6 change of current end.
Preceding taking off shown in Figure 19 in the prior art, higher because of the electric current rate of descent of rectifier diode D5, the due to voltage spikes that is produced is also higher, this due to voltage spikes again with 2 * (Vin/n) (non-2 * (V
C8/ n)) the phase superposition, cause the reverse voltage of rectifier diode D5 higher.And the technical scheme that proposes through the present invention, the voltage stress of rectifier diode D5 significantly reduces and is improved in the output circuit 13.
T6～t7 stage
As shown in figure 10.During t6, lagging leg 12 electric crystal M3 reach no-voltage and turn-off under the capacitor C 3 of lagging leg 12, C4 effect, this moment electric current (i
L7-i
P) begin capacitor C 3 is charged, capacitor C 4 is discharged, the voltage (c point voltage) that electric crystal M3 lets out in the source utmost point two ends begins to rise, and the voltage that electric crystal M4 lets out in the source utmost point two ends begins to descend.
T7～t8 stage
As shown in figure 11.During t7, the voltage that electric crystal M3 lets out in the source utmost point two ends rises to Vin, and the voltage that electric crystal M4 lets out in the source utmost point two ends drops to 0V, is clamped at 0V (conduction voltage drop of ignoring electric crystal M4 body diode D4) simultaneously, for electric crystal M4 no-voltage is opened the condition of foundation; The energy that is stored in auxiliary brachium pontis 20 inductance L 7 begins to be fed back to input power supply Vin by electric crystal M4 body diode D4, and the electric current of the electric crystal M4 body diode of flowing through D4 is (i
L7-i
P).
After the t8
As shown in figure 12, during t8, electric crystal M4 no-voltage is open-minded, and the electric current of the electric crystal M4 that flows through still is (i
L7-i
P), i
L7Under the effect of Vac=-Vin/2, begin to reduce and oppositely increase, work as i
L7Drop to less than i
PThe time, the electric current forward of the electric crystal M4 that flows through rises, and after this circuit enters the course of work in second cycle.Because the course of work and first cycle in second cycle are similar, so no longer describe in detail.
Can understand the physical circuit of a preferred embodiment of the present invention by above-mentioned explanation and construct and detailed operation principle, and the further conclusion of warp characteristics of the present invention are as following:
Electric crystal M1, the M2 of leading-bridge 11 realizes zero voltage switching: close at electric crystal and have no progeny, because the load current (Io/n that reflexes to transformer 10 primary sides is arranged, Io is a load current) participate in parasitic capacitance C1, the C2 of electric crystal M1, M2 are discharged and recharged, for electric crystal M1, M2, can realize zero voltage switching at an easy rate, this is the basic advantage of phase whole-bridging circuit.
Electric crystal M3, the M4 of lagging leg 12 realizes zero voltage switching: close at electric crystal M3, M4 and have no progeny, because of transformer 10 secondary sides by short circuit, reflex to the load current of primary side and fail parasitic capacitance C3, the C4 of electric crystal M3, M4 are discharged and recharged, utilize energy stored in transformer 10 leakage inductances merely, be difficult to make electric crystal M3, M4 to realize zero voltage switching.The present invention utilizes the electric current that capacitor C 6, C7, inductance L 7 provide in the auxiliary brachium pontis 20 via increasing auxiliary brachium pontis 20, parasitic capacitance C3, the C4 of electric crystal M3, M4 is discharged and recharged, thereby can realize the zero voltage switching of electric crystal M3, M4.。
The effect of blocking capacitor C8: different with general phase-shift full bridge circuit is, blocking capacitor C8 not only can prevent transformer 10 magnetic bias, and provide a voltage to force rectifier diode D6 conducting (supposing before to be another rectifier diode D5 conducting transmitted power) in the circulation incipient stage, thereby make the Circuit Fault on Secondary Transformer short circuit in winding, blocking capacitor C8 and resonant inductance Ls begin resonance immediately, and transformer primary side current iP is changed into-Io/n by Io/n.Secondary side current is shifted to D6 by rectifier diode D5, and after transfer was finished, rectifier diode D5 had realized zero-current switching, thereby suppresses the reverse-recovery problems of rectifier diode on transformer 10 secondary sides.
The effect of auxiliary brachium pontis 20: in the circulation stage, transformer 10 primary side current iP by Io/n (or-Io/n) change into-process of Io/n (or Io/n) in, provide a current path, to prevent this electric current flow through body diode D3, the D4 of electric crystal M3, M4 in the lagging leg 12.
And as described in preceding taking off, at lagging leg 12 electric crystal M3, M4 between transfer period, auxiliary brachium pontis 20 provides electric current and parasitic capacitance C3, the C4 of electric crystal M3, M4 is discharged and recharged, and lagging leg 12 electric crystal M3, M4 are achieved zero voltage switching.
Except that aforementioned first embodiment, the present invention is able to other variation designs and is achieved:
As shown in figure 13, its basic framework is identical with first embodiment, what desire to emphasize is: the resonant inductance Ls that is connected in series on transformer 10 primary sides can be an independently inductance element, also can be replaced by the leakage inductance institute equivalence of transformer 10, reason is that resonant inductance Ls is the littler inductance of a sense value.
As shown in figure 14, it is the present invention's the 3rd preferred embodiment, its basic framework is still identical with first embodiment, it is only to be made up of single capacitor C 7 and inductance L 7 that difference is in: this auxiliary brachium pontis 20, because the capacitance of auxiliary brachium pontis 20 is big (capacitance that refers to capacitor C 6, C7), can guarantee that the voltage that a is ordered in the circuit is stabilized in Vin/2, and ripple is less; Putting before this, auxiliary brachium pontis 20 can adopt LC to replace LCC, and when adopting the LC circuit, under the situation of single capacitor C 7, its capacitance is got greatly, also can guarantee that a point voltage is stabilized in Vin/2, and ripple is less.
As shown in figure 15, it is the present invention's the 4th preferred embodiment, its basic framework is still identical with first embodiment, difference be in: increased by an inductance L 8 in this auxiliary brachium pontis 20, this inductance L 8 is to be serially connected with between two capacitor C 6, C7 connected node a and the blocking capacitor C8 (b point).Because full-bridge circuit is under zero load or underloading situation, electric current I o/n is less, may there be enough energy that parasitic capacitance C1, the C2 of leading-bridge 11 electric crystal M1, M2 are discharged and recharged, may make difficult realization of zero voltage switching of electric crystal M1, M2, as in auxiliary brachium pontis 20, adding another inductance L 8, can provide the parasitic capacitance C1 of one road auxiliary current to electric crystal M1, M2, C2 to discharge and recharge, make electric crystal M1, M2 in full-load range, realize zero voltage switching.
Aforementioned each embodiment does to change design at the brachium pontis of transformer 10 primary sides, and in addition, the present invention also can do to change design at the output circuit 13 of transformer 10 secondary sides:
As shown in figure 16, be the present invention's the 5th preferred embodiment, its basic framework is still identical with first embodiment, difference be in: rectifier diode D5, D6 as full-wave rectification in this output circuit 13 can be replaced by a bridge rectifier D 5～D8.
As shown in figure 17, be the present invention's the 6th preferred embodiment, its basic framework is identical with first embodiment, difference be in: the outputting inductance L5 in this output circuit 13 is changed to negative terminal by the output anode.
As shown in figure 18, it is the present invention's the 7th preferred embodiment, its basic framework is still identical with first embodiment, difference is in: the rectifier diode D5 in this output circuit 13, D6 polarity exchanges, this is because the winding symmetry of transformer 10 secondary sides, so rectifier diode D5, D6 polarity are exchanged the unlikely operate as normal that influences circuit.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in the scope that does not break away from technical solution of the present invention, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, foundation technical spirit of the present invention is to above any simple modification that embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (6)
1. the phase-shift full bridge circuit of a soft switching is characterized in that it comprises:
One transformer;
One leading-bridge is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with an end of transformer primary side;
One lagging leg is made up of two electric crystals, and the connected node of this two electric crystal is to be connected with the end in addition of transformer primary side;
One blocking capacitor is serially connected with between the connected node and transformer primary side of two electric crystals in the leading-bridge, further is serially connected with a resonant inductance between this transformer primary side and the blocking capacitor;
One auxiliary brachium pontis comprises an at least one electric capacity and a coupled inductance, and this electric capacity one end is connected with power supply, and end is connected with the transformer primary side by the inductance of described auxiliary brachium pontis in addition; And
One output circuit is located on the secondary side of transformer, is by two rectifier diodes, an outputting inductance, the full-wave rectifying circuit that an output capacitance is formed; Wherein
Aforesaid blocking capacitor provides a voltage to force a wherein rectifier diode conducting in the output circuit in the circulation incipient stage, thereby with Short Circuit Fault on Secondary Transformer, blocking capacitor then begins resonance with resonant inductance, it is negative that primary side current is transferred to, and secondary side current is by the rectifier diode transfer of another rectifier diode conducting in described output circuit in the output circuit, after transfer was finished, described another rectifier diode was promptly realized zero-current switching.
2. the phase-shift full bridge circuit of soft switching according to claim 1, it is characterized in that wherein said auxiliary brachium pontis is made up of two electric capacity and an inductance, two electric capacity be interconnect and cross-over connection on power end, its two connected node is connected with the transformer primary side by the inductance of described auxiliary brachium pontis.
3. the phase-shift full bridge circuit of soft switching according to claim 1, it is characterized in that wherein said auxiliary brachium pontis is made up of electric capacity and inductance, electric capacity one end is connected with power end, and end is connected with the transformer primary side by the inductance of described auxiliary brachium pontis in addition.
4. the phase-shift full bridge circuit of soft switching according to claim 2 is characterized in that wherein said auxiliary brachium pontis further is provided with another inductance, and it is connected between the two electric capacity connected nodes and blocking capacitor of described auxiliary brachium pontis.
5. the phase-shift full bridge circuit of soft switching according to claim 1 is characterized in that wherein said outputting inductance is to be serially connected with between Circuit Fault on Secondary Transformer and the output anode.
6. the phase-shift full bridge circuit of soft switching according to claim 1 is characterized in that wherein said outputting inductance is to be serially connected with between Circuit Fault on Secondary Transformer and the output negative terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW095113128A TW200740099A (en) | 2006-04-13 | 2006-04-13 | Soft-switching phase-shifting full bridge circuit |
| CNB2006100763817A CN100481694C (en) | 2006-04-13 | 2006-04-20 | Soft switching phase-shift full bridge circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW095113128A TW200740099A (en) | 2006-04-13 | 2006-04-13 | Soft-switching phase-shifting full bridge circuit |
| CNB2006100763817A CN100481694C (en) | 2006-04-13 | 2006-04-20 | Soft switching phase-shift full bridge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101060284A CN101060284A (en) | 2007-10-24 |
| CN100481694C true CN100481694C (en) | 2009-04-22 |
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|---|---|---|---|
| CNB2006100763817A Expired - Fee Related CN100481694C (en) | 2006-04-13 | 2006-04-20 | Soft switching phase-shift full bridge circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100481694C (en) |
| TW (1) | TW200740099A (en) |
Cited By (1)
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| CN103795251A (en) * | 2012-10-29 | 2014-05-14 | 台达电子工业股份有限公司 | Power converter and control method thereof |
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| CN101478256B (en) * | 2008-09-17 | 2011-12-21 | 清华大学 | Soft switch welding inverter, phase-shifting control method and soft switching method |
| US7957161B2 (en) * | 2009-03-03 | 2011-06-07 | National Taiwan University Of Science And Technology | Power converters |
| NZ587357A (en) * | 2010-08-13 | 2013-03-28 | Auckland Uniservices Ltd | Control circuit for pick-up in inductive power transfer system selectively shunts diodes in rectifier bridge to reduce transient disturbances to primary current |
| CN102545618B (en) * | 2010-12-21 | 2014-03-26 | 广东易事特电源股份有限公司 | Full-bridge phase-shifting soft switching circuit |
| JP5530401B2 (en) | 2011-05-26 | 2014-06-25 | 株式会社日立情報通信エンジニアリング | Power supply |
| CN105490543A (en) * | 2014-09-17 | 2016-04-13 | 联想(北京)有限公司 | Circuit and full-bridge converter |
| CN106033940A (en) * | 2015-03-11 | 2016-10-19 | 天津圣纳科技有限公司 | Full-bridge phase-shifted soft switching inverter power supply |
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| CN106300993B (en) * | 2016-10-14 | 2017-10-31 | 湖南大学 | Bridge arm multiplexing high-efficiency rate Full-bridge phase-shift device before and after a kind of |
| DE102016220358A1 (en) | 2016-10-18 | 2018-04-19 | Robert Bosch Gmbh | DC-DC converter and method for driving a DC-DC converter |
| CN106787751B (en) * | 2016-12-23 | 2019-07-12 | 天津大学 | Efficient phase whole-bridging circuit under light-load mode |
| CN106533183B (en) * | 2016-12-23 | 2019-03-26 | 天津大学 | High efficiency isolated DC full-bridge circuit |
| CN110299847A (en) * | 2019-06-06 | 2019-10-01 | 湖州顺为能源科技有限公司 | The phase shifting full bridge soft switch circuit of the shutdown of inductance auxiliary and loop current suppression |
| CN110798086B (en) * | 2019-09-23 | 2021-08-10 | 漳州科华电气技术有限公司 | Three-level soft switching rectifying circuit |
| CN111147062B (en) * | 2020-01-19 | 2023-03-14 | 芯海科技（深圳）股份有限公司 | Pressure sensor module, pressure detection device and terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103795251A (en) * | 2012-10-29 | 2014-05-14 | 台达电子工业股份有限公司 | Power converter and control method thereof |
| TWI482408B (en) * | 2012-10-29 | 2015-04-21 | Delta Electronics Inc | Power converter and method for controlling the same |
| US9231488B2 (en) | 2012-10-29 | 2016-01-05 | Delta Electronics, Inc. | Power converter and method for controlling the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101060284A (en) | 2007-10-24 |
| TWI309915B (en) | 2009-05-11 |
| TW200740099A (en) | 2007-10-16 |
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