CN1555126A - Passive soft switch method suitable for multiple tube converter - Google Patents
Passive soft switch method suitable for multiple tube converter Download PDFInfo
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- CN1555126A CN1555126A CNA2003101145512A CN200310114551A CN1555126A CN 1555126 A CN1555126 A CN 1555126A CN A2003101145512 A CNA2003101145512 A CN A2003101145512A CN 200310114551 A CN200310114551 A CN 200310114551A CN 1555126 A CN1555126 A CN 1555126A
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Abstract
This invention disclose a passive soft switch method suitable for a multi-tube converter used in a semi-bridge converter, in which, a passive soft switch network composed of six high speed quick resume diodes, four high frequency non-inductive absorption condensers and a transformer assistant winding are added on the basis of traditional hard switch semi-bridge converter. This passive soft switch network enables the hard switch semi-bridge converter to get the effect of passive soft switch with the method of inducing the boostrap potential non-loss energy-supply reset by transformer buffering electric energy, either used in a whole bridge converter directly or a dual tube forward converter indirectly.
Description
Technical field:
The present invention relates to a kind of soft switch new technology, it belongs to electrician's subject, power electronics branch field.
Background technology:
In order to overcome the defective of hard-switching converter, many soft-switching process have been proposed.These soft-switching process can be divided into two big classes.One class is the active soft switching technology, and is typical in PWM no-voltage or zero current transition soft switch technique, and they are with the auxiliary active switch that adds and L, C resonant element, make the change of current during the power electronics pipe is finished transition state under no-voltage or under the zero current; Its essence is to have utilized L, C resonant circuit to have the real-time controllability of voltage or current over-zero state and active switch, realizes soft switch.But the resonant energy here must be enough greatly to create the condition of zero voltage switch or Zero Current Switch, and active in addition resonant circuit should be worked under the control signal of soft on-off controller.The complexity of in fact oneself power consumption of auxiliary circuit, and active device and control has also been brought the raising of cost and the reduction of reliability, so applying of many soft switch techniques has been subjected to very big restriction.Another kind then is the passive flexible switch technology, it utilizes the variation of main circuit power electronics pipe PWM state to replace being subjected to the auxiliary active switch of given sequencing control, only manage on hard-switching converter, to constitute passive buffer-type soft switch circuit with the passive and nondestructive components and parts, because active switch that need not be extra and control corresponding, detection, drive circuit, lower cost, higher reliability, cost performance are preferably just arranged, but also may obtain to approach the effect of active soft switching technology and the attention that obtains people day by day.
Yet, at present except the full-bridge passive flexible switch converter of special phase-shift PWM controlled, to most be the multitube converter of control method with conventional P WM, the passive flexible switch technology is still failed practicability and is become defective.Phase-shift PWM controlled also has the not equal defective of control circuit complexity, four power electronic device operating states and suffered electric stress.Above-mentioned defective main cause has these: (1) most of passive flexible switch technology are single-ended non-isolation type converter design, and circuit topology is not suitable for multitube and isolates the pattern converter; (2) traditional multitube converter is voltage source DC/DC or the DC/AC that adopts high frequency transformer, does not have energy-storage reactor at the input source end, and circuit and parameter thereof are different fully with single-ended non-isolation type converter; (3) there is the circuit complexity in the multitube converter, influencing each other acts on seriously, and the condition of work of soft switch is restricted.Therefore, the progress of the bibliographical information of this respect and relevant technologies is all very limited.According to retrieval as can be known: most important technical progress is that the K.M.Smith of California, USA university Irvin branch school (UCI) and the circuit integrated approach of using of K.M.Smedley proposition are realized new technology (the IEEE TRANSACTIONS ON POWERELECTRONICS of passive flexible switch on all PWM isolated form inverters, VOL.15, NO.1,2000 (1)).This technical essential is application circuit characteristic and graph theory, with the circuit integrated approach element in the degeneracy passive flexible switch network reasonably, obtains rational circuit topology, can obtain passive flexible switch effect preferably with less elements.This technological deficiency is: inductance, capacity cell value that (1) is used for energy exchange, transmission are bigger, are unfavorable for the circuit microminiaturization; The loop of (2) energy exchange, transmission is more, not simple and direct, causes buffer loop to influence each other greatly, and circuit parameter is relied on greatly, and soft switch element parameter is complied with anti-in circuit condition, complicated design; (3) will add two inductors at least, these inductors easily produce bigger due to voltage spikes, and loss is also much bigger than capacitor.
Summary of the invention:
The objective of the invention is on given multitube hard-switching converter, to realize a kind of passive flexible switch method that is applicable to the multitube converter.
Task of the present invention is achieved in that and is applied to half bridge converter, be on traditional hard switching half bridge converter basis, add one by six high speed fast recovery diodes, four noninductive absorption capacitors of high frequency, the passive flexible switch network of the uniqueness of an auxiliary winding formation of transformer, first absorption diode in the network is in parallel with the main electrode reversed polarity of first arm power electronics pipe of half bridge converter, one first absorption capacitor also in parallel on the main electrode two ends of first arm power electronics pipe, second absorption diode is also in parallel with the main electrode reversed polarity of second arm power electronics pipe of half bridge converter, one second absorption capacitor also in parallel on the main electrode of second arm power electronics pipe, first absorption capacitor is identical with the value of second absorption capacitor, its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, the negative electrode of isolating with first reset diode is connected with the anode of first absorption diode, the anode of first reset diode is connected with first reseting capacitor, also connecting the negative electrode of isolating on its contact with the 3rd reset diode, the anode of the 3rd reset diode is received on the negative pole of second arm power electronics pipe, the other end of first reseting capacitor is received on the non-dotted end of additional coupling winding of high frequency transformer, the dotted end of the dotted end of additional coupling winding and the former limit winding of high frequency transformer is connected together, this contact also is the current potential mid point of half bridge converter, additional coupling winding and the shared same magnetic core of former limit winding, and the number of turn of additional coupling winding equals the number of turn of former limit winding, purpose is to make the induced potential of additional coupling winding become size identical with the induced potential of former limit winding, the polarity unanimity, also be connected to second reseting capacitor on the tie point of first reseting capacitor and additional coupling winding, the other end of second reseting capacitor is connected with the negative electrode of isolating with second reset diode, also connecting the anode of isolating on its contact with the 4th reset diode, the negative electrode of the 4th reset diode is received on the positive pole of first arm power electronics pipe, the anode of second reset diode is received on the negative electrode of second absorption diode, first reseting capacitor is identical with the value of second reseting capacitor, all be half of first absorption capacitor or the second absorption capacitor value, effect due to the complementary network is exactly during first arm power electronics pipe and second arm power electronics pipe one after the other on-off, additional coupling winding can produce the bootstrapping electromotive force because of induction, this electromotive force just becomes to superpose with the electromotive force of the capacitor that absorbs transient state energy, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish resetting of capacitive energy not forming electric current loop, so this network can make the hard switching half bridge converter obtain the passive flexible switch effect with former limit winding.
The key of passive flexible switch technology is the converter to periodic duty, can make the buffering accumulated energy element that is attached to the usefulness of conduct absorption power electronics pipe switch transient state energy on the hard switching circuit, and the realization energy can't harm energy regenerative and resets.Obviously, the energy regenerative reset mode of transient state energy is simple and direct more, and the topology of soft switch circuit is also just simple more, and the parameter designing of buffer element is also just uncomplicated, and loss is also less, cost is also lower.It is diverse that the present invention proposes a kind of and above-mentioned technology, can be applicable to semibridge system, full-bridge converter, the two-tube forward formula converter of the usefulness conventional P WM control method of being made up of a plurality of power electronics pipes fully.It is to utilize a small-power coupling winding that is attached on the high frequency transformer, in conjunction with a spot of small-power passive and nondestructive element, forms the passive flexible switch new method that a kind of harmless energy regenerative of transformer induction bootstrapping electromotive force formula that cushions electric energy resets.It has not only solved the transformer coupled ill-effect problem of bringing, and with its succinct topology, lower cost, less energy exchange, to transmit loop, lower loss, stronger buffering effect be performance characteristic.Do not find and " a kind of passive and nondestructive soft switch technique that the is applicable to the multitube converter " similar techniques that proposes by literature search.This is a kind of new technology that also is not in the news.
This technology is different from existing various soft switch technique, it directly is attached on the semibridge system of being made up of a plurality of power electronics pipes or full-bridge type hard-switching converter with the passive flexible switch network of uniqueness, this passive flexible switch network also can be attached on the two-tube forward formula hard-switching converter through suitable change, all, constitute novel soft switch transducer with the harmless energy regenerative repositioning method of transformer induction bootstrapping electromotive force formula of buffering electric energy.
Embodiment:
Below with reference to accompanying drawing enforcement example of the present invention is further described:
Fig. 1 is for adding the half bridge converter main circuit diagram of new technology.
Fig. 2 is traditional hard switching half bridge converter main circuit diagram.
Fig. 3 is phase I (t0---t1) equivalent circuit diagram of Fig. 1 circuit in one-period T.
Fig. 4 is second stage (t1---t2) equivalent circuit diagram of Fig. 1 circuit in one-period T.
Fig. 5 is phase III (t2---t3) equivalent circuit diagram of Fig. 1 circuit in one-period T.
Fig. 6 is quadravalence section (t3---t4) equivalent circuit diagram of Fig. 1 circuit in one-period T.
Fig. 7 is for adding the full-bridge converter main circuit diagram of new technology.
Fig. 8 is traditional hard switching full-bridge converter main circuit diagram.
Fig. 9 is for adding the two-tube forward formula inverter main circuit figure of new technology.
Figure 10 is the traditional two-tube forward formula of hard switching inverter main circuit figure.
In the drawings: A is the current potential mid point of half bridge converter; Cr1 is first reseting capacitor; Cr2 is second reseting capacitor; Cs1 is first absorption capacitor; Cs2 is second absorption capacitor; Cs3 is the 3rd absorption capacitor; Cs4 is the 4th absorption capacitor; Dr1 is first reset diode; Dr2 is second reset diode; Dr3 is the 3rd reset diode; Dr4 is the 4th reset diode; Dr5 is the 5th reset diode; Ds1 is first absorption diode; Ds2 is second absorption diode; Ds3 is the 3rd absorption diode; Ds4 is the 4th absorption diode; VT1 is first arm power electronics pipe of a back bridge arm circuit; VT2 is second arm power electronics pipe of a back bridge arm circuit; VT3 is first arm power electronics pipe of preceding bridge arm circuit; VT4 is second arm power electronics pipe of preceding bridge arm circuit; VT5 is high-end power electronics pipe, and VT6 is a low side power electronics pipe; T1 is a high frequency transformer; Na is the additional coupling winding of high frequency transformer T1; Np is a former limit winding; Lr is an inductor.
The analytic demonstration of the passive flexible switch new technology take Fig. 1 as representative that the present invention is proposed is as follows: Fig. 2 Be traditional hard switching half bridge converter; The frame of broken lines circuit is add on Fig. 2 basis only among Fig. 1 Special passive flexible switch network. With the half bridge converter among Fig. 1 by the different workers in its cycle T Be divided into four working stages as state. Fig. 3 is the t0---t1 stage among the T, is the electronic power switch pipe The conducting phase of VT1 (seeing the heavy line among Fig. 3); When supposing t=t0, first arm of half bridge converter Switching tube VT1 is open-minded, this moment according to Faraday's law and Lenz's law, the former limit of high frequency transformer T1 around The self-induction electromotive force direction of group Np is that dotted end (end of the same name) is negative polarity, non-dotted end (non-same polarity) Be positive polarity, its electromotive force UNpThe size value is identical with input voltage source Ui1, with former limit winding Np with identical around a magnetic core, winding coil turn, and the self-induction electromotive force direction of the auxiliary coupling winding Na that is connected with former limit winding Np same polarity also for non-dotted end (non-same polarity) be positive polarity, this electromotive force UNaValue is also identical with input voltage source Ui1, when the polarity of voltage of the second reseting capacitor Cr2 is upper negative lower timing, and electromotive force UNaThe stacked electromotive force that adds with it, this stack electromotive force must be greater than the electromotive forces of input voltage source Ui1, In one period very short time after t0, (see among the figure by the 4th reset diode Dr4 loop like this The electric weight that the little direction of arrow), just can absorb the second reseting capacitor Cr2 is fully to input voltage source Ui1 releases, and finish harmless energy regeneration and reset, and the electricity of the second reseting capacitor Cr2 after resetting It is upper just lower negative pressing reversing, and the discharge current of the second reseting capacitor Cr2 has also suppressed first arm electricity Opening of power electron tube VT1 shoved. Fig. 4 is the t1---t2 stage among the T, is first arm power electronics Pipe VT1 off-phases; Being connected in parallel on the upper first absorption capacitor Cs1 of first arm power electronics pipe VT1 makes Half arm power electronics pipe VT1 has realized no-voltage shutoff buffering, and is equally fixed according to Faraday's law and Lenz Rule, the self-induction electromotive force direction of the former limit winding Np of high frequency transformer T1 is that dotted end (end of the same name) is Positive polarity, non-dotted end (non-same polarity) is negative polarity, what be connected with former limit winding Np same polarity is additional The self-induction electromotive force direction of coupling winding Na also is that dotted end (non-same polarity) is positive polarity, this moment second Absorb capacitor Cs2, the second reseting capacitor Cr2 and electromotive force UNaThe stacked electromotive force that adds, this electromotive force that superposes Must be greater than the electromotive force of input voltage source Ui2, like this in one period very short time after t1, by second Reset diode Dr2 loop (seeing the little direction of arrow among the figure) just can absorb capacitor Cs2 to second The electric weight that absorbs is released to input voltage source Ui1 fully, and finish harmless energy regeneration and reset, and Just (this result is Fig. 3 just under the polarity of voltage of the second reseting capacitor Cr2 after resetting was changed into and born Pre-conditioned to the second reseting capacitor Cr2 polarity of voltage), second absorbs capacitor Cs2 owing to have the Two absorb the embedding position of diode Ds2, and the voltage after its discharge is about no-voltage. Fig. 5 is the t2---t3 among the T In the stage, be second arm power electronics pipe VT2 conducting phase (seeing the heavy line among Fig. 5); When t=t2, Second arm switch pipe VT2 of half bridge converter is open-minded, as previously mentioned because the second absorption capacitor Cs2 Be about no-voltage, so the time second arm power electronics pipe VT2 be that no-voltage is open-minded, according to Faraday's law With Lenz's law, the self-induction electromotive force direction of the former limit winding Np of high frequency transformer T1 is that dotted end is (same The name end) be positive polarity, non-dotted end (non-same polarity) is negative polarity, its electromotive force UNpThe size value is identical with input voltage source Ui2, and the self-induction electromotive force direction of the auxiliary additional coupling winding Na that is connected with former limit winding Np same polarity also is that dotted end (end of the same name) is positive polarity, this electromotive force UNaThe size value is also identical with input voltage source Ui2, when the polarity of voltage of the second reseting capacitor Cr1 is upper negative lower timing, and electromotive force UNaThe stacked electromotive force that adds with it, this stack electromotive force must greater than the electromotive force of input voltage source Ui2, exist like this In one period very short time after the t2, (see the little arrow among the figure by the 3rd reset diode Dr3 loop Direction), just can fully let out the electric weight that the first reseting capacitor Cr1 absorbs to input voltage source Ui2 Bleed off, finish harmless energy regeneration, and the polarity of voltage of the first reseting capacitor Cr1 after resetting changes Become upper just lower bearing, the discharge current of the first reseting capacitor Cr1 has also suppressed second arm power electronics pipe Opening of VT2 shoved. Fig. 6 is the t3---t4 stage among the T, for second arm power electronics pipe VT2 turn-offs Stage; Be connected in parallel on the upper second absorption capacitor Cs2 of second arm power electronics pipe VT2 and make second arm electric power electricity Son pipe VT2 has realized no-voltage shutoff buffering, and equally according to Faraday's law and Lenz's law, high frequency becomes The self-induction electromotive force direction of the former limit winding Np of depressor T1 is that non-dotted end (non-same polarity) is positive polarity, Dotted end (end of the same name) is negative polarity, the additional coupling winding Na that is connected with former limit winding Np same polarity Self-induction electromotive force direction also be that non-dotted end (non-same polarity) is positive polarity, absorb electric capacity this moment first Device Cs1, the first reseting capacitor Cr1 and electromotive force UNaThe stacked electromotive force that adds, this stack electromotive force must be greater than defeated Enter the electromotive force of voltage source Ui1, like this in one period very short time after t3, by first two utmost points that reset Pipe Dr1 loop (seeing the little direction of arrow among the figure) just can absorb the first absorption capacitor Cs1 Electric weight is released to input voltage source Ui1 fully, finishes harmless energy regeneration, and first after resetting The polarity of voltage of reseting capacitor Cr1 changes into that negative lower just (this result is first resetting of Fig. 5 just Capacitor Cr1 polarity of voltage pre-conditioned), first absorbs capacitor Cs1 owing to have first to absorb two utmost points The embedding position of pipe Ds1 is about no-voltage after its discharge. Like this to the cycle state of t4=t0, because the One absorbs capacitor Cs1 is about no-voltage, so the time first arm power electronics pipe VT1 no-voltage open-minded. Therefore, the result after the analytic demonstration is: the work because the harmless energy regenerative of additional passive flexible switch network resets With, make half bridge converter be operated in the soft on off state of no-voltage on-off. Therefore, in this uniqueness The passive flexible switch role of network under, to the electric energy that the switch transient state of power electronics pipe buffering absorbs, warp Cross coupling winding Na, capacitor Cr, diode Dr by high frequency transformer T1, just consisted of transformer The harmless energy regenerative repositioning method of induction bootstrapping electromotive force formula has obtained passive soft at the hard switching half bridge converter The effect of switch, the novel processing buffering energy approach of this kind is technical attributes of the present invention, also is this Technology is in the resonant type soft-switch technology with inductor and capacitor formation that is different from essence in the past.
A kind of passive flexible switch method of multiple tube converter that is applicable to is: be applied to half bridge converter and see figure The frame of broken lines circuit is additional on traditional hard switching half bridge converter (Fig. 2) basis among 1, Fig. 1 Unique passive flexible switch network, this is not had by six high speed fast recovery diodes, four high frequencies by one Sense absorbs capacitor, the auxiliary winding of transformer consists of additional passive flexible switch network, in the network First absorbs the main electrode antipole of first arm power electronics pipe VT1 of diode Ds1 and half bridge converter The property parallel connection, (can replace with the diode that is integrated in the power electronics pipe, in power field effect transistor Body diode), at the main electrode two ends of power electronics pipe (VT1) also one first in parallel absorb electricity Container C s1, second absorbs diode Ds2 also with second arm power electronics pipe VT2's of half bridge converter The parallel connection of main electrode reversed polarity (can replace with the diode that is integrated in the power electronics pipe, imitate such as power field Answer the body diode in the transistor), also one second absorption in parallel on the main electrode of power electronics pipe VT2 Capacitor Cs2, first absorbs capacitor Cs1 and second, and to absorb the value of capacitor Cs2 identical, its value and It is the same that tradition is turn-offed buffer circuit, should apply the power electronics pipe to being issued in the physical circuit condition greatly Effectively turn-off buffering effect, isolation absorbs diode with the negative electrode and first of the first reset diode Dr1 The anodic bonding of Ds1, the anode of the first reset diode Dr1 is connected with the first reseting capacitor Cr1, its Also connecting the negative electrode of isolating with the 3rd reset diode Dr3 on the contact, the 3rd reset diode Dr3's Anode is received on the negative pole of second arm power electronics pipe VT2, another termination of the first reseting capacitor Cr1 On the non-dotted end of the additional coupling winding Na of high frequency transformer T1, additional coupling winding Na gets ready End is connected together with the dotted end of the former limit winding Np of high frequency transformer T1, and this contact also is that semibridge system becomes The current potential mid point A of parallel operation, additional coupling winding Na and former limit winding Np share same magnetic core, and attached The number of turn that adds coupling winding Na equals the number of turn of former limit winding Np, and purpose makes additional coupling winding Na Induced potential becomes size identical with the induced potential of former limit winding, and polarity is consistent, the first reseting capacitor Cr1 With also be connected to the second reseting capacitor Cr2, second reseting capacitor on the tie point of additional coupling winding Na The other end of Cr2 is connected with the negative electrode of the second reset diode Dr2 with isolation, also connecting on its contact every From the anode with the 4th reset diode Dr4, the negative electrode of the 4th reset diode Dr4 is received first arm electricity On the positive pole of power electron tube VT1, the anode of the second reset diode Dr2 is received second and is absorbed diode Ds2 Negative electrode on, the first reseting capacitor Cr1 is identical with the value of the second reseting capacitor Cr2, all is Effect due to half of one absorption capacitor Cs1 or the second absorption diode Cs2 value, complementary network Be exactly during first arm power electronics pipe VT1 and second arm power electronics pipe VT2 one after the other on-off, Additional coupling winding Na can produce the bootstrapping electromotive force because of induction, this electromotive force and the electric capacity that absorbs transient state energy The electromotive force of device becomes just to superpose, and the electromotive force that always superposes makes the capacitor that has charged sufficiently high electromotive force be arranged directly to defeated Enter source discharge, thereby flow down and finish resetting of capacitive energy not forming electric current loop with former limit winding, therefore This network can make the hard switching half bridge converter obtain the effect of passive flexible switch. Passive soft the opening here Close the ordinary buffer electricity of network except being formed by diode Ds in parallel on the power electronics pipe and capacitor Cs Outside the road, additional coupling winding Na, the capacitor Cr of remaining high frequency transformer T1, diode Dr element, The harmless energy regenerative of transformer induction bootstrapping electromotive force formula that has just consisted of buffering electric energy of the present invention is reset to feature Passive flexible switch new technology core.
" a kind of passive flexible switch method that is applicable to the multitube converter " new technology is directly applied to full-bridge converter see Fig. 7, the frame of broken lines circuit is for having added the passive flexible switch network that proposes among Fig. 7 on traditional hard switching full-bridge converter (Fig. 8) basis.For the full-bridge converter that two brachium pontis are arranged, owing to back the bridge arm circuit of forming by first arm power electronics pipe (VT1) and second arm power electronics pipe (VT2), identical with the corresponding bridge arm circuit of half bridge converter, first passive flexible switch network that event is adopted here, identical with the aforesaid passive flexible switch complete network that is applied to half bridge converter, but to different with half bridge converter, preceding the bridge arm circuit of forming by first arm power electronics pipe (VT3) and second arm power electronics pipe (VT4), also additional by two high speed fast recovery diodes, two noninductive absorption capacitors of high frequency, second passive flexible switch network that inductor in high frequency constitutes, the 3rd absorption diode (Ds3) in this network is in parallel with preceding first arm power electronics pipe (VT3) main electrode reversed polarity of full-bridge converter, one the 3rd absorption capacitor (Cs3) also in parallel on the main electrode of power electronics pipe (VT3), the 4th absorption diode (Ds4) is also in parallel with preceding second arm power electronics pipe (VT4) main electrode reversed polarity of full-bridge converter, one second absorption capacitor (Cs4) also in parallel on the main electrode of power electronics pipe (VT4), the 3rd absorption capacitor (Cs3) is identical with the value of the 4th absorption capacitor (Cs4), they are also all identical with the value of first absorption capacitor (Cs1) in parallel or second absorption capacitor (Cs2) on the power electronics pipe of a back brachium pontis, its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, the inductor (Lr) of electric current is opened in the restriction of also connecting between the positive terminal of input voltage source and preceding first arm power electronics pipe (VT3) positive terminal, it is the same that its value and tradition are opened buffer circuit, should be greatly effectively open buffering effect to being issued to the power electronics pipe applied in the physical circuit condition, effect due to two additional networks, it is exactly the diagonal group of forming by first arm power electronics pipe (VT3) of preceding brachium pontis and second arm power electronics pipe (VT2) of a back brachium pontis, the diagonal group of forming by second arm power electronics pipe (VT4) of preceding brachium pontis and first arm power electronics pipe (VT1) of a back brachium pontis, during the synchronous on-off of each diagonal group, and during two diagonal group one after the other on-offs, additional coupling winding (Na) can produce the bootstrapping electromotive force because of induction, this electromotive force just forms with the electromotive force that absorbs the capacitor of transient state energy and superposes, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish capacitive energy and reset not forming electric current loop, so this network can make the hard switching full-bridge converter obtain the passive flexible switch effect with former limit winding.
" a kind of passive flexible switch method that is applicable to the multitube converter " new technology indirect application is seen Fig. 9 in two-tube forward formula converter, the frame of broken lines circuit is on the two-tube forward formula of traditional hard switching converter (Figure 10) basis among Fig. 9, magnetic core resets two high speed fast recovery diodes (Dr1) of usefulness with (Dr2) afterwards in removing Figure 10, has added the new passive flexible switch network of changing through suitably.This new passive flexible switch network is by five high speed fast recovery diodes, three noninductive absorption capacitors of high frequency, an inductor in high frequency, an auxiliary winding formation of transformer, first absorption capacitor (Cs1) in the network is connected with the positive pole of the high-end power electronics pipe (VT5) of two-tube forward formula converter, the negative pole of power electronics pipe (VT5) is connected with the negative electrode of isolating with first reset diode (Dr1), this contact is also connecting the inductor (Lr) that electric current is opened in restriction, it is the same that its value and tradition are opened buffer circuit, should be greatly effectively open buffering effect to being issued to the power electronics pipe applied in the physical circuit condition, the other end of inductor (Lr) is connected on the dotted end of former limit winding (Np) of high frequency transformer (T1), the other end of first absorption capacitor (Cs1) is connected with the anode of first reset diode (Dr1), also be connected to the dotted end of the additional coupling winding (Na) of high frequency transformer (T1) on this contact, this point also is connected to the negative electrode of isolating with the 5th reset diode (Dr5), the anode of the 5th reset diode (Dr5) is received the negative pole end of input voltage source, non-termination first reseting capacitor (Cr1) of getting ready of additional coupling winding (Na), additional coupling winding (Na) and the shared same magnetic core in former limit winding (Np), and the number of turn of additional coupling winding (Na) equals the number of turn of former limit winding (Np), purpose is to make the induced potential of coupling winding become size identical with the induced potential of former limit winding, the polarity unanimity, the other end of first reseting capacitor (Cr1) is connected with the anode of isolating with the 4th reset diode (Dr4), the negative electrode of the 4th reset diode (Dr4) is received the positive terminal of input voltage source, also connect the negative electrode of isolating on the anode of the 4th reset diode (Dr4) with the 3rd reset diode (Dr3), the anode of the 3rd reset diode (Dr3) is connected with second absorption capacitor (Cs2), also connecting the negative electrode of isolating on its contact with second reset diode (Dr2), the anode of second reset diode (Dr2) is connected with the positive pole of the low side power electronics pipe (VT6) of two-tube forward formula converter, the other end of second absorption capacitor (Cs2) is connected with the negative pole end of power electronics pipe (VT6), first absorption capacitor (Cs1) is identical with the value of second absorption capacitor (Cs2), its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, this connection make the 4th reset diode (Dr4) and the 5th reset diode (Dr5) can be with conventional art the same magnetic core reset function of finishing forward converter, the value of first reseting capacitor (Cr1) is the twice of first absorption capacitor (Cs1) or second absorption capacitor (Cs2) value, effect due to the complementary network is exactly during the synchronous on-off of high-end power electronics pipe (VT5) and low side power electronics pipe (VT6), additional coupling winding (Na) can produce the bootstrapping electromotive force because of induction, this electromotive force just forms with the electromotive force that absorbs the capacitor of transient state energy and superposes, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish resetting of capacitive energy not forming electric current loop, so this network can make the two-tube forward formula of hard switching converter obtain the passive flexible switch effect with former limit winding (Np).
Claims (3)
1. passive flexible switch method that is applicable to the multitube converter, it is characterized in that: be applied to half bridge converter, be on traditional hard switching half bridge converter basis, add one by six high speed fast recovery diodes, four noninductive absorption capacitors of high frequency, the passive flexible switch network of the uniqueness of an auxiliary winding formation of transformer, first absorption diode (Ds1) in the network is in parallel with the main electrode reversed polarity of first arm power electronics pipe (VT1) of half bridge converter, one first absorption capacitor (Cs1) also in parallel on the main electrode two ends of first arm power electronics pipe (VT1), second absorption diode (Ds2) is also in parallel with the main electrode reversed polarity of second arm power electronics pipe (VT2) of half bridge converter, one second absorption capacitor (Cs2) also in parallel on the main electrode of second arm power electronics pipe (VT2), first absorption capacitor (Cs1) is identical with the value of second absorption capacitor (Cs2), its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, the negative electrode of isolating with first reset diode (Dr1) is connected with the anode of first absorption diode (Ds1), the anode of first reset diode (Dr1) is connected with first reseting capacitor (Cr1), also connecting the negative electrode of isolating on its contact with the 3rd reset diode (Dr3), the anode of the 3rd reset diode (Dr3) is received on the negative pole of second arm power electronics pipe (VT2), the other end of first reseting capacitor (Cr1) is received on the non-dotted end of additional coupling winding (Na) of high frequency transformer (T1), the dotted end of the dotted end of additional coupling winding (Na) and the former limit winding (Np) of high frequency transformer (T1) is connected together, this contact also is the current potential mid point (A) of half bridge converter, additional coupling winding (Na) and the shared same magnetic core in former limit winding (Np), and the number of turn of additional coupling winding (Na) equals the number of turn of former limit winding (Np), purpose is to make the induced potential of additional coupling winding (Na) become size identical with the induced potential of former limit winding, the polarity unanimity, also be connected to second reseting capacitor (Cr2) on the tie point of first reseting capacitor (Cr1) and additional coupling winding (Na), the other end of second reseting capacitor (Cr2) is connected with the negative electrode of isolating with second reset diode (Dr2), also connecting the anode of isolating on its contact with the 4th reset diode (Dr4), the negative electrode of the 4th reset diode (Dr4) is received on the positive pole of first arm power electronics pipe (VT1), the anode of second reset diode (Dr2) is received on the negative electrode of second absorption diode (Ds2), first reseting capacitor (Cr1) is identical with the value of second reseting capacitor (Cr2), all be half of first absorption capacitor (Cs1) or second absorption capacitor (Cs2) value, effect due to the complementary network is exactly during first arm power electronics pipe (VT1) and second arm power electronics pipe (VT2) one after the other on-off, additional coupling winding (Na) can produce the bootstrapping electromotive force because of induction, this electromotive force just becomes to superpose with the electromotive force of the capacitor that absorbs transient state energy, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish resetting of capacitive energy not forming electric current loop, so this network can make the hard switching half bridge converter obtain the passive flexible switch effect with former limit winding.
2. a kind of passive flexible switch method that is applicable to the multitube converter according to claim 1, it is characterized in that: the full-bridge converter that directly applies to two brachium pontis, be on traditional hard switching full-bridge converter basis, because back the bridge arm circuit that first arm power electronics pipe (VT1) and second arm power electronics pipe (VT2) are formed, identical with the corresponding bridge arm circuit of half bridge converter, first passive flexible switch network that event is adopted here, identical with the passive flexible switch complete network of the above-mentioned uniqueness that is applied to half bridge converter, but to different with half bridge converter preceding the bridge arm circuit of forming by first arm power electronics pipe (VT3) and second arm power electronics pipe (VT4), also additional by two high speed fast recovery diodes, two noninductive absorption capacitors of high frequency, second passive flexible switch network that inductor in high frequency constitutes, the 3rd absorption diode (Ds3) in the network is in parallel with first arm power electronics pipe (VT3) main electrode reversed polarity of preceding first brachium pontis of full-bridge converter, one the 3rd absorption capacitor (Cs3) also in parallel on the main electrode of power electronics pipe (VT3), the 4th absorption diode (Ds4) is also in parallel with second arm power electronics pipe (VT4) main electrode reversed polarity of preceding second brachium pontis of full-bridge converter, one the 4th absorption capacitor (Cs4) also in parallel on the main electrode of power electronics pipe (VT4), the 3rd absorption capacitor (Cs3) is identical with the value of the 4th absorption capacitor (Cs4), they are also all identical with the value of first absorption capacitor (Cs1) in parallel or second absorption capacitor (Cs2) on the power electronics pipe of a back brachium pontis, its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, the inductor (Lr) of electric current is opened in the restriction of also connecting between the positive terminal of input voltage source and preceding first arm power electronics pipe (VT3) positive terminal, it is the same that its value and tradition are opened buffer circuit, should be greatly effectively open buffering effect to being issued to the power electronics pipe applied in the physical circuit condition, effect due to two additional networks, it is exactly the diagonal group of forming by first arm power electronics pipe (VT3) of preceding brachium pontis and second arm power electronics pipe (VT2) of a back bridge arm circuit, the diagonal group of forming by second arm power electronics pipe (VT4) of preceding brachium pontis and first arm power electronics pipe (VT1) of a back bridge arm circuit, during the synchronous on-off of each diagonal group power electronics pipe, and two during the diagonal group power electronics pipe one after the other on-off, additional coupling winding (Na) can produce the bootstrapping electromotive force because of induction, this electromotive force just forms with the electromotive force that absorbs the capacitor of transient state energy and superposes, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish capacitive energy and reset not forming electric current loop, so this network can make the hard switching full-bridge converter obtain the passive flexible switch effect with former limit winding.
3. passive flexible switch method that is applicable to the multitube converter, it is characterized in that: be applied to two-tube forward formula converter indirectly, be on the two-tube forward formula of traditional hard switching converter basis, reset after two high speed fast recovery diodes of usefulness removing magnetic core, add one by five high speed fast recovery diodes, three noninductive absorption capacitors of high frequency, an inductor in high frequency, the additional coupling of a transformer winding constitutes new passive flexible switch network, first absorption capacitor (Cs1) in the network is connected with the positive pole of the high-end power electronics pipe (VT5) of two-tube forward formula converter, the negative pole of power electronics pipe (VT5) is connected with the negative electrode of isolating with first reset diode (Dr1), this contact is also connecting the inductor (Lr) that electric current is opened in restriction, it is the same that its value and tradition are opened buffer circuit, should be greatly effectively open buffering effect to being issued to the power electronics pipe applied in the physical circuit condition, the other end of inductor (Lr) is connected on the dotted end of former limit winding (Np) of high frequency transformer (T1), the other end of first absorption capacitor (Cs1) is connected with the anode of first reset diode (Dr1), also be connected to the dotted end of the additional coupling winding (Na) of high frequency transformer (T1) on this contact, this point also is connected to the negative electrode of isolating with the 5th reset diode (Dr5), the anode of the 5th reset diode (Dr5) is received the negative pole end of input voltage source, non-termination first reseting capacitor (Cr1) of getting ready of additional coupling winding (Na), additional coupling winding (Na) and the shared same magnetic core in former limit winding (Np), and the number of turn of additional coupling winding (Na) equals the number of turn of former limit winding (Np), purpose is to make the induced potential of coupling winding become size identical with the induced potential of former limit winding, the polarity unanimity, the other end of first reseting capacitor (Cr1) is connected with the anode of isolating with the 4th reset diode (Dr4), the negative electrode of the 4th reset diode (Dr4) is received the positive terminal of input voltage source, also connect the negative electrode of isolating on the anode of the 4th reset diode (Dr4) with the 3rd reset diode (Dr3), the anode of the 3rd reset diode (Dr3) is connected with second absorption capacitor (Cs2), also connecting the negative electrode of isolating on its contact with second reset diode (Dr2), the anode of second reset diode (Dr2) is connected with the positive pole of the low side power electronics pipe (VT6) of two-tube forward formula converter, the other end of second absorption capacitor (Cs2) is connected with the negative pole end of power electronics pipe (VT6), first absorption capacitor (Cs1) is identical with the value of second absorption capacitor (Cs2), its value is the same with tradition shutoff buffer circuit, should apply effective shutoff buffering effect to being issued to the power electronics pipe greatly in the physical circuit condition, this connection make the 4th reset diode (Dr4) and the 5th reset diode (Dr5) can be with conventional art the same magnetic core reset function of finishing forward converter, the value of first reseting capacitor (Cr1) is the twice of first absorption capacitor (Cs1) or second absorption capacitor (Cs2) value, effect due to the additional new network is exactly during the synchronous on-off of high-end power electronics pipe (VT5) and low side power electronics pipe (VT6), additional coupling winding (Na) can produce the bootstrapping electromotive force because of induction, this electromotive force just forms with the electromotive force that absorbs the capacitor of transient state energy and superposes, total stack electromotive force makes the capacitor that has charged have sufficiently high electromotive force directly to discharge to input source, thereby flow down and finish resetting of capacitive energy not forming electric current loop, so this network can make the two-tube forward formula of hard switching converter obtain the passive flexible switch effect with former limit winding (Np).
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| CNA2003101145512A CN1555126A (en) | 2003-12-25 | 2003-12-25 | Passive soft switch method suitable for multiple tube converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102224669A (en) * | 2008-11-21 | 2011-10-19 | Abb技术有限公司 | Power converter with multi-level voltage output and harmonics filter |
| CN103501109A (en) * | 2013-10-25 | 2014-01-08 | 北京交通大学 | Converter bridge arm circuit with energy active feedback absorption loop and converter |
-
2003
- 2003-12-25 CN CNA2003101145512A patent/CN1555126A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102224669A (en) * | 2008-11-21 | 2011-10-19 | Abb技术有限公司 | Power converter with multi-level voltage output and harmonics filter |
| CN102224669B (en) * | 2008-11-21 | 2014-04-16 | Abb技术有限公司 | Power converter with multi-level voltage output and harmonics filter |
| CN103501109A (en) * | 2013-10-25 | 2014-01-08 | 北京交通大学 | Converter bridge arm circuit with energy active feedback absorption loop and converter |
| CN103501109B (en) * | 2013-10-25 | 2016-03-23 | 北京交通大学 | There is converter bridge arm circuit and the converter of energy active feedback absorption loop |
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