CN109391125A - Judge that complementary switch is in the power switch system and method for Sofe Switch or hard switching state - Google Patents

Abstract

The present invention relates to power switch systems and method that a kind of judgement complementary switch is in Sofe Switch or hard switching state.First switch and the second switch is connected in series between the first reference mode and the second reference mode, first reference mode and the second reference mode have different current potentials, complementary first switch and the second switch is driven alternately to connect, another one is turned off and cannot be also turned on when one of them is connected；Dead time is set between the connection period of first switch and the connection period of second switch；Detect the current potential commutating period node at the interconnecting nodes of first switch and the second switch；The commutating period node is then characterized earlier than the finish time of dead time in Sofe Switch state in each switch periods；The finish time that the commutating period node is later than dead time in each switch periods then characterizes in hard switching state.

Description

Judge complementary switch be in Sofe Switch or hard switching state power switch system and Method

Technical field

Present invention relates generally to the drive areas of power switch, are related in the side that driving power switchs It is in hard switching or Sofe Switch state that switch can be more accurately screened in case.

Background technique

Switching tube refers to using transistor as switching device, mainly includes bipolar transistor, metal-oxide type field-effect Transistor, insulated gate bipolar transistor etc..When designing Switching Power Supply, the loss of switching tube is an important indicator.Reduce loss The efficiency and power density that system can be improved, can also reduce the volume of radiator, so that Switching Power Supply minimizes, extension is opened Powered-down source service life.Switching tube loss is generally divided into turn-on consumption, turn-off power loss and conduction loss three parts.Conduction loss Conduction loss two parts of conduction loss and freewheel current when again including transmitting energy.The loss that different switching techniques generate is each It is not identical.Hard switching refers to the on and off when switching tube both end voltage and electric current do not drop to zero, therefore can generate biggish Turn-on consumption and turn-off power loss.Sofe Switch is divided into zero voltage switch ZVS and Zero Current Switch ZCS.ZVS refers to open-minded in switching tube Before, the turn-on consumption for making its both end voltage drop to zero, ZVS is can reduce substantially to zero.ZCS refers to before switching tube shutdown, makes The turn-off power loss that its electric current is zero, ZCS is can reduce substantially to zero.

For full-bridge synchronous rectification circuit, it can be reduced really if using ZVS relative to hard switching and open damage Consumption, but there is also the conduction losses of freewheel current.Furthermore circuit topography parameter such as leakage inductance also influences whether the Sofe Switch of ZVS Performance.Therefore the use of single hard switching technology or soft switch technique is not optimal control method, is existed according to certain condition The switching of progress intelligence, which can then make full use of the characteristics of both technologies, between Sofe Switch and hard switching realizes optimum control.It passes The analog control method of system cannot achieve the automatic switchover of Sofe Switch and hard switching, with MCU microcontroller technology in recent years Development, the control section of Switching Power Supply are gradually developed to digitlization direction.A numerically controlled big advantage is its flexibility simultaneously And the digitlization of compensation network, complicated drive waveforms generation, complicated Fault Diagnosis Strategy function etc. are simulation control institutes It is difficult to realize, therefore digitlization obtains faster development.

In order to overcome the defect of hard-switching converter, many soft-switching process are proposed.These soft-switching process can divide For two major classes.One kind is active soft switching technology, and typical such as PWM no-voltage or zero point pretreatment soft switch technique, they are With additional auxiliary active switch and L, C resonant element, power electronics pipe is made to complete transition shape under no-voltage or under zero current The change of current during state；Its essence is that be utilized L, C resonance circuit there are voltages or the real-time of current zero-crossing point and active switch can Control property, Lai Shixian Sofe Switch.But resonant energy here must be sufficiently large to create zero voltage switching or zero current switching Condition, furthermore active resonance circuit should work under the control signal of Sofe Switch controller.Actually auxiliary circuit itself Power consumption and active device and the complexity of control also bring the raising of cost and the reduction of reliability, therefore many Sofe Switch The popularization and application of technology are limited by very large.Another then be passive flexible switch technology, it utilizes main circuit power electronics The variation of pipe PWM state is only tried with passive and nondestructive component to replace the auxiliary active switch by given timing control Passive buffering soft switch circuit is constituted on hard-switching converter, due to not having to additional active switch and corresponding control, inspection It surveys, driving circuit, just has lower cost, higher reliability, preferable cost performance, but also may obtain close to active The effect of soft switch technique and pay attention to increasingly obtaining people.

At present other than the full-bridge passive flexible switch converter of special phase-shift PWM controlled, to mostly with traditional arteries and veins Width is modulated to the multitube converter of control method, and passive flexible switch technology still fails practical and becomes defect.Phase shift pulsewidth Modulation control also has the defect that control circuit is complicated, four power electronic devices working conditions are different from suffered electric stress.It is above-mentioned Defect main cause has these: most of passive flexible switch technologies are for single-ended non-isolation type converter design, circuit topology It is not suitable for multitube isolation pattern converter；Traditional multitube converter is the voltage source DC to DC using high frequency transformer Conversion or direct current to exchange conversion, input source side do not have energy-storage reactor, circuit and its parameter with it is single-ended non-isolated Code converter is entirely different；That there are circuits is complicated for multitube converter, influences each other that it is serious to act on, and the operating condition of Sofe Switch is wanted It is restricted.Therefore the document report and progress in relation to technology of this respect are all very limited.According to retrieval: most important technology Progress be the branch school California, USA university Irvin (UCI) propose with circuit integrated approach on all PWM isolated form inverters Realize passive flexible switch new technology (IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL.15, NO.1, 2000(1)).The technical essential is application circuit characteristic and graph theory, with circuit integrated approach reasonably degeneracy passive flexible switch net Element in network obtains reasonable circuit topology, can obtain preferable passive flexible switch effect with less element.The technology Defect is: it is larger for energy exchange, the inductance of transmitting, capacity cell value, it is unfavorable for circuit miniaturization；Energy exchange, transmitting Circuit it is more, not simple and direct, cause buffer loop to influence each other greatly, circuit parameter relied on big, Sofe Switch component parameters rely on In circuit condition, complicated design；Two inductors are at least added, these inductors are also easy to produce biggish due to voltage spikes, damage It consumes also much bigger compared with capacitor.

Summary of the invention

In of the invention one optional embodiment, a kind of judgement switch is disclosed in Sofe Switch state or is opened firmly The method of off status is connected in series with first switch and the second switch between the first and second nodes, wherein this method comprises: The complementary first switch and the second switch of driving is alternately connected；In the connection period of the connection period and second switch of first switch Between set dead time；Detect the current potential commutating period node at the interconnecting nodes of first switch and the second switch；Each The commutating period node is then characterized earlier than the finish time of dead time in Sofe Switch state in switch periods；In each switch The finish time that the commutating period node is later than dead time in period then characterizes in hard switching state.

Above-mentioned method, in which: utilize the interconnecting nodes of a divider Divider sampling first switch and the second switch The voltage at place detects the commutating period node according to the voltage of sampling.

Above-mentioned method, in which: one buck converter BUCK of setting includes first switch and the second switch, is saved in interconnection Inductance is set between NX1 and the voltage output node NO1 of buck converter at point, and the first and second switches, which are directly connected on, to be considered as The first node NI1 of voltage input node and be considered as with reference to ground second node NI2 between.

Above-mentioned method, in which: one boost converter BOOST of setting includes first switch and the second switch, is being interconnected Inductance is set between NX2 and the voltage input node NI1 of boost converter at node, and the first and second switches are directly connected on view For voltage output node first node NO1 and be considered as with reference to ground second node NO2 between.

Above-mentioned method, in which: the decompression single armed of the type of voltage step-up/down converter of one H bridge type of setting includes first switch and the Two switches；Or the boosting single armed of the type of voltage step-up/down converter of one H bridge type of setting includes first switch and the second switch namely so-called BUCK-BOOST circuit, decompression single armed is BUCK and the single armed that boosts is BOOST.

Above-mentioned method, in which: inductance is set between some third node at interconnecting nodes: driving first and the Two switches are alternately connected, and the exchange arteries and veins that the variation of sine wave rule is pressed relative to a predetermined reference current potential is generated at third node Dynamic voltage.The current potential of usual first node is higher than the current potential of second node, and predetermined reference current potential here can be equivalent to second The current potential of node may not be the current potential of second node.

Above-mentioned method, in which: first switch and resonant inductance are in series between interconnecting nodes and first node；Described Sofe Switch state includes: in the connection stage in each switch periods in the first switch, and the resonant inductance is opened with second With the shunt capacitance of second switch resonance occurs for the parasitic capacitance of pass；The first switch works in zero current and connects and zero electricity Flow shutdown mode；The second switch works in no-voltage and connects and zero voltage turn-off mode.

Above-mentioned method, in which: first switch and resonant inductance are in series between interconnecting nodes and first node；Described Sofe Switch state includes: in the connection stage in each switch periods in the second switch, and the resonant inductance is opened with first With the shunt capacitance of first switch resonance occurs for the parasitic capacitance of pass；The first switch works in no-voltage and connects and zero electricity Press shutdown mode；The second switch works in zero current and connects and zero-current switching mode.

Above-mentioned method, in which: first switch and resonant inductance are in series between interconnecting nodes and first node；Described Sofe Switch state includes: in the connection stage in the first switch in each switch periods, resonant inductance and second switch Parasitic capacitance or occur resonance with the shunt capacitance of second switch, second switch works in no-voltage and connects and zero voltage turn-off Mode；In the connection stage in second switch in each switch periods, the parasitic capacitance of resonant inductance and first switch or with Resonance occurs for the shunt capacitance of first switch, and first switch works in no-voltage and connects and zero voltage turn-off mode.

Above-mentioned method, in which: the Sofe Switch state includes: first or second switch the connecing in each period Logical moment, electric current flow through the anti-parallel diodes of the first or second switch or the backward dioded of parasitism, cause described The voltage of first or second switch is lowered to zero, provides no-voltage whereby for first or second switch and opens mode.

In of the invention one preferably optional embodiment, disclose one kind can determine whether in Sofe Switch state or The power switch system of hard switching state, wherein include: the first switch being connected in series between first node and second node And second switch；The divider of the voltage at interconnecting nodes for sampling first switch and the second switch；Wherein alternately connect First switch and the second switch be complementary switch, set between the connection period of first switch and the connection period of second switch Determine dead time；The current potential commutating period node at the interconnecting nodes is detected according to the voltage of sampling；In each switch The commutating period node is then characterized earlier than the finish time of dead time in Sofe Switch state in period；In each switch periods The finish time that the interior commutating period node is later than dead time then characterizes in hard switching state.

Above-mentioned power switch system, in which: one buck converter of setting includes the first switch and the second switch, Inductance is set between the voltage output node of buck converter at the interconnecting nodes.

Above-mentioned power switch system, in which: one boost converter of setting includes the first switch and the second switch, Inductance is set between the voltage input node of boost converter at the interconnecting nodes.

Above-mentioned power switch system, in which: the decompression single armed that the type of voltage step-up/down converter of H bridge type is arranged includes first switch And second switch；Or the boosting single armed of the type of voltage step-up/down converter of setting H bridge type includes first switch and the second switch.

Above-mentioned power switch system, in which: inductance is set between some third node at interconnecting nodes: driving First and second switches are alternately connected, and are generated at third node and are changed relative to a predetermined reference current potential by sine wave rule AC ripple voltage.The current potential of usual first node is higher than the current potential of second node, and predetermined reference current potential here can wait Effect is that the current potential of second node may not be the current potential of second node.

Above-mentioned power switch system, in which: be in series between the interconnecting nodes and first node first switch and Resonant inductance；The Sofe Switch state include: in the connection stage in each switch periods in the first switch, it is described humorous Shake inductance and second switch parasitic capacitance or resonance occurs with the shunt capacitance of second switch；The first switch works in zero Current turns ON and zero-current switching mode；The second switch works in no-voltage and connects and zero voltage turn-off mode.

Above-mentioned power switch system, in which: be in series between the interconnecting nodes and first node first switch and Resonant inductance；The Sofe Switch state includes: in the connection stage in each switch periods in the second switch, the resonance With the shunt capacitance of first switch resonance occurs for the parasitic capacitance of inductance and first switch；The first switch works in zero electricity Crimping is led to and zero voltage turn-off mode；The second switch works in zero current and connects and zero-current switching mode.

Above-mentioned power switch system, in which: be in series between the interconnecting nodes and first node first switch and Resonant inductance；The Sofe Switch state include: in the connection stage in first switch in each switch periods, resonant inductance with With the shunt capacitance of second switch resonance occurs for the parasitic capacitance of second switch, and second switch works in no-voltage and connects and zero Voltage shutdown mode；In the connection stage in second switch in each switch periods, the parasitism of resonant inductance and first switch With the shunt capacitance of first switch resonance occurs for capacitor, and first switch works in no-voltage and connects and zero voltage turn-off mode.

Above-mentioned method, in which: the Sofe Switch state includes: first or second switch the connecing in each period Logical moment, electric current flow through the anti-parallel diodes of the first or second switch or the backward dioded of parasitism, cause described The voltage of first or second switch is lowered to zero, provides no-voltage whereby for first or second switch and opens mode.

Detailed description of the invention

To keep above-mentioned purpose and feature and advantage more obvious and easy to understand, specific embodiment is done with reference to the accompanying drawing Detailed explaination, read it is described further below and referring to the following drawings after, feature and advantage of the invention will be evident.

Fig. 1 is the waveform diagram compared together with sofe switch pattern is mode integrated with hard switching.

Fig. 2 is the voltage waveform and current waveform schematic diagram for the switch that power switch tube turns on and off.

Fig. 3 is the schematic diagram that switching loss is generated under power switch tube zero current turning-on and shutdown mode.

Fig. 4 is that power switch tube no-voltage turns on and off the schematic diagram that switching loss is generated under mode.

Fig. 5 is using the circuit topological structure with boosting single armed and decompression single armed as exemplary diagram.

Fig. 6 is to illustrate the schematic diagram that Sofe Switch and hard switching can be applied in direct current and AC system.

Specific embodiment

Below in conjunction with each embodiment, clear and complete elaboration, but described reality are carried out to technical solution of the present invention Applying example only is the present invention with the embodiment used in illustrating is described herein and not all embodiment, based on the embodiments such as this, this field Technical staff scheme obtained belongs to protection scope of the present invention without making creative work.

In power switch system, power supply is usually to use power semiconductor as switch element, passes through periodicity On-off switch controls the duty ratio of Katyuan part to adjust output voltage.Switching Power Supply is mainly by input circuit, translation circuit, defeated Circuit and control unit etc. form out.Power conversion is its core, is mainly made of switching circuit, and certain occasions are also applied Transformer is arrived.In order to meet the requirement of high power density, converter needs work in high frequency state, and switching transistor will use The crystal arm that switching speed is high, the turn-on and turn-off time is short, typical power switch have power transistor, power field effect pipe and Insulated type bipolar junction transistor etc. is a variety of.Control mode is divided into pulse width modulation, pulse frequency modulated, pulsewidth modulation and frequency Modulation hybrid modulation etc. is a variety of, and the most commonly used is pulse width modulation modes.

Shown in Figure 1, the DC-DC pwm power converter technique that industry is developed and is applied since in early days is typical A kind of hard switching technology.In order to run Switching Power Supply can also expeditiously under high frequency state, domestic and international power electronics and Power technology circle constantly researchs and develops high-frequency soft switch technology.Sofe Switch and hard switching waveform comparison are as shown in the figure.

Shown in Figure 1, power switch tube is from ON is connected to shutdown OFF state: the electric current I1 for flowing through switch drops to zero It is lifted with the potential U1 for being applied to switch ends from zero, electric current I1 and potential U1 is in turn off process almost without crosspoint whereby Or cross events are extremely short to avoid generation power switch from being lost and belong to one kind of Sofe Switch.

Shown in Figure 1, power switch tube is from shutdown OFF to connection ON state: the electric current I2 for flowing through switch starts from scratch The potential U2 for being lifted and being applied to switch ends drops to zero, and electric current I2 and potential U2 is during connection almost without friendship whereby Crunode or cross events are extremely short to avoid generation power switch from being lost and belong to one kind of Sofe Switch.

Shown in Figure 1, power switch tube is from ON is connected to shutdown OFF state: the electric current I3 for flowing through switch drops to zero It is lifted with the potential U3 for being applied to switch ends from zero, there are crosspoint or friendships in turn off process by electric current I3 and potential U3 whereby The fork time can not ignore to generate one kind that power switch is lost and belongs to hard switching.

Shown in Figure 1, power switch tube is from shutdown OFF to connection ON state: the electric current I4 for flowing through switch starts from scratch The potential U4 for being lifted and being applied to switch ends drops to zero, and there are crosspoints during connection by electric current I4 and potential U4 whereby Or cross events can not ignore to generate one kind that power switch is lost and belongs to hard switching.

Shown in Figure 1, as can be seen from Fig., the characteristics of Sofe Switch is power device --- mainly power switch is zero On or off under voltage conditions is turned off or is connected under the conditions of zero current.Compared with hard switching, the power device of Sofe Switch exists It works under the conditions of no-voltage, zero current, power device switching loss is small.At the same time, du/dt and di/dt greatly decline so It can eliminate corresponding electromagnetic interference and radio frequency interference, improve the reliability of converter.While in order to reduce the body of converter Long-pending and weight, it is necessary to realize high frequency.Switching frequency is improved, while improving the conversion efficiency of converter, must just be reduced out Close loss.The approach for reducing switching loss is exactly the soft switch technique and Sofe Switch for realizing the Sofe Switch of switching tube, therefore basic Technology expansion topology have become be Switching Technique an important research direction.Herein to Sofe Switch and hard switching Working characteristics be compared, and soft switch technique is elaborated.

It is shown in Figure 2, in order to understand the advantage of Sofe Switch in detail, it is necessary to which the work for first understanding traditional hard switching is special The loss characteristics of property and power switch tube.Fig. 2 is that switching tube is driven and connection event and shutdown event namely so-called occurs Switch when voltage VD and electric current ID waveform.It is using the bipolar transistor based on semiconductor material when switching tube major part Or field-effect tube or bipolar insulated gate transistor or thyristor etc., inside semiconductor power switch physical structure there are junction capacity and Various parasitic diodes and on state resistance RDSON etc. are not ideal switching devices, therefore when switching tube switchs work, Turn-on consumption and turn-off power loss are generated, switching loss (Switching Loss) is referred to as.Frequency is switched according to the common recognition of industry Rate is higher, and total switching loss is bigger, and the efficiency of converter is lower.The presence of switching loss limits converter switches frequency Raising, to limit the miniaturization and lightweight of converter.

It is shown in Figure 2, it is assumed that some power switch starts connection since moment t1, until moment t2 power switch is Fully switched on, intermediate total delay is the period of t1-t2: meaning that the voltage VD at power switch both ends drops to zero from off-state value Period t1-t2 intersect with the electric current ID for flowing through power switch from the period t1-t2 that zero rises to on-state value, power switch Conduction loss is the power consumption PLOSS-ON that electric current existing for this period itself and voltage generate.Assuming that some power switch from when It carves t3 and starts starting shutdown, until moment t4 power switch is just driven to and complete switches off, when intermediate total delay is t3-t4 Section: then the voltage VD at power switch both ends is from the period t3-t4 for rising to off-state value and the electricity that flows through power switch of being almost equal to zero Stream ID is intersected from period t3-t4 that on-state value drops to zero, and the turn-off power loss of power switch is existing for this period itself The power consumption PLOSS-OFF that electric current and voltage generate.The derailing switch driven by pulse width modulating signal in traditional pwm converter Several defects of the hard switching state that part works shown in Fig. 2, hard switching work hamper the raising of switching device working frequency, Existing main problem first is that: turn on and off that loss is big, the electric current of switching device rises when opening and voltage decline is same Shi Jinhang and generate juxtaposition；Voltage rises when shutdown and electric current declines while carrying out and generating juxtaposition.Necessarily cause Situation be that the overlapping turn-on consumption for causing device and turn-off power loss of voltage and current waveform increase with the raising of switching frequency Add.Existing main problem second is that: inevitably there is inductive element such as lead-in inductance and transformation in circuit in perceptual shutdown problem The parasitic inductances such as device leakage inductance or substantial inductive, when switching device shutdown, due to passing through electricity in the unit time of the inductive element The variation of stream is very big, to generate big electromagnetic interference, and the peak voltage generated is added in switching device both ends, easily causes electricity Pressure breakdown.Existing main problem third is that: capacitive opens problem, when switching device is opened under very high voltage, storage To all be dissipated in the switching device in the energy in switching device junction capacity causes switching device to cross cause thermal damage.Existing master Want problem fourth is that: there is reverse recoveries when diode reverse recovery problem, diode become cut-off from being connected, in this phase In, diode is still on state, if opening the switching device of series connection with it immediately, be easy to cause DC power supply moment short Road generates very big dash current, gently then causes the switching device and diode to consume and sharply increases, heavy then cause its damage.

Shown in Figure 2, the above problem seriously hinders the raising of power switch working frequency, and what is used in recent years soft opens Investigative technique is closed to overcome drawbacks described above to provide effective approach.Different with hard switching work, ideal soft switching process is Electric current first drops to zero, and voltage slowly rises to off-state value again, then turn-off power loss is approximately equal to zero.Since device has turned off preceding electric current Drop to zero, solves the problems, such as perceptual shutdown.Ideal soft connection process is that voltage first drops to zero, electric current slowly rise to it is logical State value, then turn-on consumption is approximately zero, and the voltage of device junction capacity is also zero, solves the problems, such as that capacitive is opened.It is switching simultaneously When opening, diode reverse recovery process is over, therefore diode direction restores problem and do not existed.

It is shown in Figure 3, it is coupled to the driving signal namely GATE signal for driving switch of switch gate or base stage Low and high level switching as shown, as switching loss is reduced and a kind of mode for trading off, Fig. 3 use zero current turning-on and The technology of shutdown: there are part almost negligible minor losses in the stage of opening, soft switching period t3-t4 process mainly flows Electric current ID through power switch first drops to zero from on-state value, be applied to power switch both ends voltage VD slowly rise to again it is subsequent Off-state value, then turn-off power loss PLOSS-OFF is approximately equal to zero.The Sofe Switch scheme is in switch OFF under voltage rising and electric current Drop no longer carries out simultaneously and no longer generates so-called juxtaposition.

It is shown in Figure 4, it is coupled to the driving signal namely GATE signal for driving switch of switch gate or base stage Low and high level switching as shown, as switching loss is reduced and a kind of mode for trading off, Fig. 4 use no-voltage open and The technology of shutdown: there are part almost negligible minor losses in off-phases, soft connection period t1-t2 process is mainly applied The voltage VD for being added in power switch both ends first drops to zero from off-state value, and the electric current ID for flowing through power switch is raised to on-state from zero again Value then connects loss PLOSS-ON and is approximately equal to zero.Sofe Switch scheme voltage decline and electric current in switch connection rise no longer It carries out simultaneously and no longer generates so-called juxtaposition.

It is shown in Figure 4, in view of the defect of so-called hard switching and the advantage of Sofe Switch, using Sofe Switch characteristic and Realizing that the strategy of Sofe Switch is main is exactly: including doubt existing for turn-on consumption and turn-off power loss based on switching loss, utilization is soft The target of switching technique is that the turn-on consumption and turn-off power loss for reducing voltage changer.Context is with the optional reality of Fig. 5 It applies the complementary switch that example has to illustrate as example, but must be noted that the voltage conversion electricity with complementary switch Road or voltage changer/converter or power optimization device are not limited to the example of diagram, and the complementary switch that arbitrary topology has is It can all be detected by methods disclosed herein in Sofe Switch state or in hard switching state.

It is shown in Figure 5, in order to illustrate this application involves hard switching and Sofe Switch scheme spirit, with diagram For the electric pressure converter for realizing power conversion, comprising: the first front side node NI1 and the second front side node NI2, and further include First rear side node NO1 and the second rear side node NO2.Wherein first is connected in series in using the switch S1 and switch S2 of power tube Between front side node NI1 and the second front side node NI2, wherein both switch S1 and switch S2 connected interconnecting nodes NX1 and the Inductance component L is coupled between one rear side node NO1.Electric pressure converter is that BUCK circuit namely switch S1 and switch S2 constitute drop Press single armed.In BUCK circuit, the switch S3-S4 of diagram can be abandoned directly from circuit topology, then the inductance of BUCK circuit Element L can be connected directly between interconnecting nodes NX1 and the first rear side node NO1.But also it can be in the first rear side node The rear side capacitor not illustrated in connection figure between NO1 and the second rear side node NO2, or also can also be in the first front side section The front side capacitor not illustrated in connection figure between point NI1 and the second front side node NI2.The BUCK circuit of power conversion can be only Vertical running.

It is shown in Figure 5, in order to illustrate this application involves hard switching and Sofe Switch scheme spirit, with diagram For the electric pressure converter for realizing power conversion, comprising: the first front side node NI1 and the second front side node NI2, and further include First rear side node NO1 and the second rear side node NO2.Wherein first is connected in series in using the switch S3 and switch S4 of power tube Between rear side node NO1 and the second rear side node NO2, wherein both switch S3 and switch S4 connected interconnecting nodes NX2 and the Inductance L is coupled between one front side node NI1.Electric pressure converter is that BOOST circuit namely switch S3 and switch S4 are constituted and risen Press single armed.In BOOST circuit, the switch S1-S2 of diagram can be abandoned directly from circuit topology, then in BOOST circuit Inductance L can be directly coupled between interconnecting nodes NX2 and the first front side node NI1.But also it can be in the first rear side node NO1 And the second rear side capacitor that does not illustrate in connection figure between rear side node NO2, or also can also be in the first front side node The front side capacitor not illustrated in connection figure between NI1 and the second front side node NI2.The BOOST circuit of power conversion can be only Vertical running.

It is shown in Figure 5, by taking the optional electric pressure converter of another kind of the realization power conversion of diagram as an example: the first front side Node NI1 and the second front side node NI2, and including the first rear side node NO1 and the second rear side node NO2.Using power tube Switch S1 and switch S2 is connected between the first front side node NI1 and the second front side node NI2, using power tube switch S3 and Switch S4 is connected between the first rear side node NO1 and the second rear side node NO2, pays attention to both switch S1 therein and switch S2 Be connected in interconnecting nodes NX1, and both switch S3 and switch S4 are connected in interconnecting nodes NX2, first interconnecting nodes NX1 and Inductance L is connected between second interconnecting nodes NX2.It is visible whereby as the decompression single armed of prime BUCK and as rear class BOOST Boosting single armed be combined into BUCK-BOOST circuit and also be provided simultaneously with decompression and boosting power conversion capability, here BUCK-BOOST circuit is H bridge type.

It is shown in Figure 5, the first mode: the electricity under decompression mode Step down is worked in the circuit for power conversion Pressure modulator approach includes: turning on and off for processor output pulse-modulated signal control switch S1 and switch S2.In each drop Compress switch the period interior time S1- for alternately connecting switch S1-S2, first setting that switch S1 is connected in each step-down switching period here The time S1-OFF of ON and switch S1 shutdown, and the time of switch S2 connection in each step-down switching period is also set as S2-ON And the time of second switch S2 shutdown is S2-OFF.Switch is turned off there are two setting between switch S1 connection and switch S2 connection Dead time D-Time avoid two switch S1-S2 from being also turned on, this is the main working mechanism of reduction voltage circuit.Limit Buck Mode lower switch S4 is continuously turned on and switch S3 is persistently turned off, and means to force the part BOOST to lose boosting in this stage Function.

It is shown in Figure 5, second of mode: the voltage under boost mode Step up is worked in the circuit for power conversion Modulator approach includes: turning on and off for the pulse-modulated signal control switch S3 and switch S4 of processor output.In each liter Compress switch period interior alternately connection switch S3 and switch S4, wherein setting the time of switch S3 connection in each boosted switch period The time S3-OFF of S3-ON and switch S3 shutdown, and the time that switch S4 is connected in each boosted switch period is S4-ON and opens The time for closing S4 shutdown is S4-OFF.Switch S3 is connected between switch S4 connection and is equipped with during the same regulation boosted switch period Two switch the dead time D-Time being turned off and switch S3-S4 are avoided directly to be simultaneously switched on, this is the work of BOOST circuit Mechanism, limits that switch S1 is continuously turned under second of mode and switch S2 is persistently turned off, it is meant that in this stage, the pressure portion Buck Divide the function of losing decompression.

It is shown in Figure 5, the third mode: the voltage in the case where circuit for power conversion works in buck Buck-Boost mode Modulator approach includes: turning on and off for the pulse-modulated signal control switch S1 and switch S2 of processor output.It is opened in decompression It closes and alternately connects switch S1-S2 in the period, set the time of the connection of the switch S1 in each step-down switching period in advance as S1- ON and be S1-OFF there are also the time of switch S1 shutdown, and also make switch S2 connection in each step-down switching period when Between be S2-ON and second switch S2 shutdown time be S22-OFF.The connection of prescribed switch S1 and the S2 of switch are set between connecting There are two the dead time D-Time that switch is turned off.The pulse-modulated signal of processor output is in addition to controlling preceding step voltage conversion Except the turning on and off of the switch S1 and switch S2 of device, step voltage conversion after the pulse-modulated signal of processor output also control The switch S3 of device and turning on and off for switch S4 alternately turn within each boosted switch period of rear class electric pressure converter Close S3 and switch S4.The time of the time S3-ON that switch S3 is connected in each boosted switch period and switch S3 shutdown is first set S3-OFF, and also set time as the time of S4-ON and switch S4 shutdown that switch S4 is connected in each boosted switch period and be S4-OFF, it is specified that during the boosted switch period connection of switch S3 and switch S4 connect between set there are two switch be turned off it is dead Area time D-Time.Prime electric pressure converter with switch S1 and switch S2 under the third mode is Buck buck stage, with It is Boost boost phase, entire power that this has switch S3 and the rear class electric pressure converter of switch S4 simultaneously, under the third mode What conversion circuit embodied is Buck-Boost circuit.Notice that the second front side node NI2 and the second rear side node NO2 can have phase Same current potential is, for example, to be total to ground reference.Between the voltage and the end NI1-NI2 voltage at the end NO1-NO2 of circuit for power conversion Difference be more than preset value when, circuit for power conversion work be depressured or boost working condition.Either converted in power When difference between the voltage and the end NI1-NI2 voltage at the end NO1-NO2 of circuit is not higher than preset value, circuit for power conversion work In the working condition of buck.Circuit for power conversion is two-way DC/DC conversion circuit.

It is shown in Figure 5, in an alternative embodiment, discloses a kind of judgement complementary switch and be in Sofe Switch state or open firmly The method of off status essentially consists in: being wherein for example set as front side node NI1 and so-called second node for example in so-called first node It is set as being connected in series with switch S1 and switch S2 between the node NI2 of front side, the potential of front side node NI1 is generally than front side node The potential of NI2 wants high.Complementary switch S1 is driven alternately to connect with switch S2, it is specified that interior the connecing in switch S1 of each switch periods Dead time is set between the connection period S2-ON of logical period S1-ON and switch S2.Then detection switch S1's and switch S2 is mutual The even current potential commutating period point at node NX1, in an alternate embodiment of the invention can be using point of the R1-R2 containing divider resistance of diagram Depressor samples the potential change situation at interconnecting nodes NX1, and for example positive current potential of this current potential commutation is switched to negative current potential, or Positive current potential is switched to from negative current potential, positive negative potential here is for the current potential that the second front side node NI2 has 's.If the potential setting that the second front side node NI2 has is ground reference, the potential change meeting at interconnecting nodes NX1 From the positive potential zero crossing for being higher than ground potential and it is switched to negative potential lower than ground potential, or from the negative potential for being lower than ground potential Zero crossing is simultaneously switched to positive potential higher than ground potential.When in each switch periods the commutating period point earlier than dead time D- The finish time of Time is judged as Sofe Switch state, and the finish time in dead zone means that switch S1 will be disconnected and switch S2 will be opened Beginning connects；Or the finish time that the commutating period point is later than dead time D-Time in each switch periods is judged as hard Switch state.Voltage at the interconnecting nodes NX1 of divider sampling switch S1-S2, sample point are for example that resistance R1-R2 is interconnected Intermediate node NS, resistance R1-R2 are connected in series between NX1 and front side node NI2, are detected according to the voltage of sampling described Commutating period point.

It is shown in Figure 5, be merely above using reduction voltage circuit as demonstration, among another optional embodiment if Then meet using booster circuit as demonstration: being for example set as rear side node NO1 and so-called second node for example in so-called first node It is set as being connected in series with switch S4 and switch S3 between rear side node NO2, the potential of front side node NI1 is generally than front side node The potential of NI2 wants high.Complementary switch S3 is driven alternately to connect with switch S4, it is specified that interior the connecing in switch S4 of each switch periods Dead time is set between the connection period S3-ON of logical period S4-ON and switch S3.Then detection switch S4's and switch S3 is mutual The even current potential commutating period point at node NX2, in an alternate embodiment of the invention can be using point of the R1-R2 containing divider resistance of diagram Depressor samples the potential change situation at interconnecting nodes NX2, and for example positive current potential of this current potential commutation is switched to negative current potential, or Positive current potential is switched to from negative current potential, positive negative potential here is relative to the second front side node NI2 or the second rear side node For the current potential that NO2 has.If the potential setting that the second front side node NI2 or the second rear side node NO2 have is reference Ground potential, then the potential change at interconnecting nodes NX2 can from be higher than ground potential positive potential zero crossing and be switched to lower than ground electricity The negative potential of position, or from the negative potential zero crossing lower than ground potential and it is switched to positive potential higher than ground potential.The side of judgement Method is: when the commutating period point earlier than the finish time of dead time D-Time is judged as Sofe Switch in each switch periods State, the finish time in dead zone mean that switch S3 will be disconnected and switch S4 will be begun to turn on；Or it should in each switch periods The finish time that commutating period point is later than dead time D-Time is judged as hard switching state.Divider sampling switch S4 and S3 Interconnecting nodes NX2 at voltage, sample point is for example the intermediate node NS of resistance R1-R2 interconnection, and resistance R1-R2 is connected on The commutating period point is detected between NX2 and rear side node NO2 and according to the voltage of sampling.

Shown in Figure 6, in conjunction with the topological structure of Fig. 5, content above is substantially using the topology of Fig. 5 as DC to DC Bidirectional converter, but many occasions also need to utilize topology generation AC ripple voltage.Needed for for example, being loaded Mains AC, in inversion system, need using two-stage even multistage architecture --- prime DC converter complete inversion The matching of device input and output voltage and electrical isolation, rear class inverter complete the inversion conversion of DC communication.Due to rear class inverter Output voltage and electric current are all low frequency acs, contain two frequency multiplication pulsating quantities, low frequency pulsating power in the instantaneous power of inverse cascade So that inverse cascade input current is contained biggish twice of output voltage frequency AC compounent, makes the output electric current of prime DC converter There is low frequency pulsating, the pulsating power is by DC converter output inductor and intermediate bus bar capacitor shared.In view of inverse Become on device DC bus the fluctuation for there is low frequency pulsating voltage, being highly desirable to reduce the busbar voltage of inverter, thus real Decoupling between the input power substantially constant and output pulsation power of existing inverter, then actively generating the low frequency arteries and veins with bus The opposite AC ripple voltage of dynamic voltage swing equal phase is injected on DC bus, so that it may to the low frequency pulsating electricity of bus The low frequency pulsating electric current for compensating and offsetting the initiation of low frequency pulsating voltage of pressure.

It is shown in Figure 6, from the point of view of releasing energy, also reside in the connection to the switch S1-S2 of power converter Or shutdown is driven, and this control is nor unique but a variety of methods and deposit.The alternative of microprocessor For the driving control of logical device, processor or the control device, state machine, controller, chip, software of transmittable driving signal System, gate array etc., to generate pulse width modulating signal.Switch S4 is controlled in an alternate embodiment of the invention to be continuously turned on but control Switch S3 is persistently turned off, or directly abandons switch S3-S4 from circuit topology and inductance is made to be directly coupled to interconnecting nodes Between NX1 and rear side node NO1, but switch S1 is considered as complementary switch with switch S2 and high frequency is alternately connected and one of them Connect another one shutdown.Such as: microprocessor driven switch S1-S2 is low due to DC bus in the period times of 0-T1 Frequency pulsating voltage signal is the positive pulsating volage of sinusoidal waveform, and control shutdown switch S1, driving switch S2 are produced within the period The burst pulse of the raw amplitudes such as a series of but unequal width replaces the negative sense of required pulsating waveform VS in the 0-T1 period to pulse Voltage VS2；Corresponding, the low frequency pulsating voltage signal in the period times of T1-T2 due to DC bus is sinusoidal waveform Negative sense pulsating volage, shutdown switch S2 and driving switch S1 generate the burst pulse of the amplitudes such as a series of but unequal width in the period To replace the positive pulsating volage VS1 of required pulsating waveform VS in the T1-T2 period.It is opened according to above embodiment driving S1 and switch S2 is closed, modulates the first pulsating volage by sine wave rule positive change, the first pulsating volage is pulsating waveform Segment VS1 of the VS within the T1-T2 period, the negative half period phase phase equal in magnitude of first pulsating volage and low frequency pulsating voltage Instead, the negative half period of the low frequency pulsating electric current can be offset in the first pulsating volage feedback to DC bus.According to above Embodiment switch S1 and switch S2, modulate the second pulsating volage changed by sine wave rule negative sense, the second pulsation is electric Pressure is segment VS2 of the pulsating waveform VR within the 0-T1 period, the positive half cycle of second pulsating volage and low frequency pulsating voltage Opposite in phase equal in magnitude can offset the low frequency pulsating electric current just in second pulsating volage feedback to DC bus Half cycle.Include from the sine wave in any some period 0-T2 that can learn complete compensation pulsating waveform VS in Fig. 6 The the second pulsating volage VS2 waveform and the first pulsating volage VS1 waveform being continuously connected.Referring to Fig. 6, by power converter generate with The opposite compensation pulsating volage VS of low frequency pulsating voltage swing equal phase is injected on bus on DC bus, is equivalent to power Converter generates the compensation electric current opposite with low frequency pulsating size of current equal phase and is injected on bus, offsets low frequency pulsating electricity Stream.Originally the pulsating current of pollution power supply is suppressed, and except not only battery itself is protected, other electricity consumptions shared on power supply are set Standby potential pulsating current is also suppressed, and is improved the utilization rate of the energy, is avoided the improper protection act of induction system.

It is shown in Figure 6, in conjunction with the topological structure of Fig. 5, in an alternative embodiment, disclose at a kind of judgement complementary switch It is essentially consisted in the method for Sofe Switch state or hard switching state: being for example set as front side node NI1 and so-called the in first node Two nodes are for example set as being connected in series with switch S1 and switch S2 between the node NI2 of front side, and the potential of front side node NI1 generally compares The potential of front side node NI2 wants high.It drives complementary switch S1 and switch S2 to replace to connect, at interconnecting nodes NX1 and third Inductance L is set between reference mode such as NO1, switch S4 can be directly controlled in an alternate embodiment of the invention and be continuously turned on but control System switch S3 is persistently turned off, or directly abandons switch S3-S4 and inductance L is made to be directly coupled to interconnecting nodes NX1 and rear side node Between NO1.The scheme that AC ripple voltage VS is generated at rear side node NO1 is main are as follows: and driving switch S1-S2 is alternately connected, The AC ripple voltage that the variation of sine wave rule is pressed relative to a predetermined reference current potential is generated at third reference mode such as NO1 VS, third reference mode such as NO1 can be relative to the common references of second front side node NI2 or the second rear side node NO2 Current potential and generate VS, common reference current potential can be the DC voltage value on the DC bus of inverter in the embodiment.Such as Fig. 6 Shutdown switch S1 and driving switch S2 generate the amplitudes such as a series of but the burst pulse of unequal width is required in the 0-T1 period to replace The negative sense pulsating volage VS2 of the pulsating waveform VS wanted；Corresponding, simultaneously driving switch S1 generates the amplitudes such as a series of to shutdown switch S2 But the burst pulse of unequal width replaces the positive pulsating volage VS1 of required pulsating waveform VS in the T1-T2 period.According to On embodiment driving switch S1 and switch S2, modulate relative to the second front side node NI2's or the second rear side node NO2 Common reference current potential presses the first pulsating volage of sine wave rule positive change, and modulates relative to the second front side node NI2 Or second rear side node NO2 common reference current potential press sine wave rule negative sense variation the second pulsating volage, first pulsation electricity Pressure is segment VS1 of the pulsating waveform VS within the T1-T2 period, and the second pulsating volage is piece of the pulsating waveform VR within the 0-T1 period Low frequency pulsating voltage can be offset in section VS2, pulsating waveform VS feedback to DC bus.It in summary can be by power converter The DC voltage relative to DC bus BUS is modulated by the first pulsating volage VS1 of sine wave rule positive change, feedback arrives The negative half period phase equal in magnitude of the first pulsating volage and the low frequency pulsating voltage for causing low frequency pulsating electric current on DC bus BUS Position is opposite.Change relative to the DC voltage of DC bus BUS by sine wave rule negative sense is modulated by power converter Two pulsating volage VS2 feed back to the second pulsating volage on DC bus BUS and cause the low frequency pulsating electricity of low frequency pulsating electric current The positive half cycle of pressure opposite in phase equal in magnitude.

It is shown in Figure 5, connecing in switch S1 in each switch periods is provided during generating AC ripple voltage VS Dead time is set between the connection period S2-ON of logical period S1-ON and switch S2.Then detection switch S1's and switch S2 is mutual The divider sampling interconnecting nodes of the R1-R2 containing divider resistance of diagram can be used in the even current potential commutating period point at node NX1 Current potential condition of commutation at NX1, commutate for example positive current potential of current potential are switched to negative current potential, or are switched to from negative current potential positive Current potential, positive or negative current potential here be relative to the current potential that the second front side node NI2 or the second rear side node NO2 have and Speech.Current potential if the potential setting for being first about to the second front side node NI2 is reference potential at the interconnecting nodes NX1 Variation can be switched to the negative potential lower than reference potential from the positive potential for being higher than reference potential, or from negative lower than reference potential Potential is simultaneously switched to positive potential higher than reference potential.When in each switch periods the commutating period point earlier than dead time D- The finish time of Time is judged as sofe switch pattern, and the finish time in dead zone namely meaning switch S1 will be disconnected and switch S2 is wanted It begins to turn on；The finish time that either the commutating period point is later than dead time D-Time in each switch periods judges For hard switching mode.

Shown in Figure 5, harmonic technology Resonant is applied to soft switch technique, its application eliminates converter work Both voltage and currents of switching device switching process overlap phenomenon in work, reduce the switching loss of switching device.It is above In each embodiment introduced, it not there are certain requirements to be connected in series between the first front side node NI1 and interconnecting nodes NX1 and open Closing S1 and resonant inductance LA namely resonant inductance LA can substantially abandon from Fig. 5.But it is opened using the soft of harmonic technology In the scheme of pass, it is a preferable implementation that switch S1 and resonant inductance LA, which are connected between the node NI1 and interconnecting nodes NX1 of front side, Example.Such as the first end of switch S1 is connected to the first front side node NI1 and connects between the second end and interconnecting nodes NX1 of switch S1 Resonant inductance LA, first end and second end can be drain electrode and source electrode here.With the current switch of diagram/zero voltage switch list For all resonance Buck-Boost reversible transducers, LA is that resonant inductance and switch S2 are parallel with resonant capacitance C2, pays attention to electricity Hold the junction capacity that C2 can be semiconductor material parasitism between the source electrode and drain electrode of power switch S2 itself, can also directly open Close the both ends S2 parallel connection external capacitive C2.In the forward direction operating mode, switch S1-S2 complementary switch works reversible transducer, resonance Inductance LA and resonant capacitance C2 switch S1 the connection stage occur resonance, switch S1 be zero current turning-on and zero-current switching, Switch S2 is only arranged since the reason of resonant capacitance C2 is that no-voltage is opened and zero voltage turn-off in switch S2 in this embodiment The resonant capacitance C2 capacitor C1 that still both ends above-mentioned switch S1 illustrate is parallel with to be abandoned from circuit topology.

Shown in Figure 5, then requiring LA in another alternative embodiment is that resonant inductance and switch S1 are parallel with Resonant capacitance C1 notices that capacitor C1 can be the knot electricity of semiconductor material parasitism between the source electrode and drain electrode of power switch S1 itself Hold, it can also be directly in switch S1 both ends parallel connection external capacitive C1.The driving switch S1-S2 in the operating mode of reversible transducer For complementary switch work, in the connection stage generation resonance of switch S2, switch S2 is zero electricity by resonant inductance LA and resonant capacitance C1 Stream is connected and zero-current switching, and switch S1 is since the reason of resonant capacitance C2 is opened and zero voltage turn-off for no-voltage, in the reality It applies in example only setting switch S1 and is parallel with the resonant capacitance C1 capacitor C2 that still both ends switch S2 illustrate by from circuit topology In abandon.

Shown in Figure 5, then requiring LA in another alternative embodiment is that resonant inductance and switch S1 are parallel with Resonant capacitance C1, switch S2 are parallel with resonant capacitance C2.Capacitor C1 can be partly to be led between the source electrode and drain electrode of switch S1 itself The junction capacity of body material parasitism, can also be in switch S1 both ends parallel connection external capacitive C1.Capacitor C2 can be power switch S2 certainly The junction capacity of semiconductor material parasitism between the source electrode and drain electrode of body, can also be in switch S2 both ends parallel connection external capacitive C2.? Driving switch S1-S2 is complementary switch work in the operating mode of reversible transducer, resonant inductance LA and resonant capacitance C1 or In the connection stage of switch S2 or S1 resonance occurs for C2, and switch S2 is that no-voltage is connected and zero is electric due to the reason of resonant capacitance C2 Pressure shutdown, switch S1 is since the reason of resonant capacitance C1 is opened and zero voltage turn-off for no-voltage, switch S1- in this embodiment S2 is zero voltage switch mode.

Referring to Fig. 5, present application discloses a kind of power switch system and the complementary switch of power switch system can determine whether It is in Sofe Switch state or hard switching state, comprising: the first switch being connected in series between first node and second node And second switch, such as S1-S2；It further include for sampling the voltage at the interconnecting nodes NX1 of first switch and the second switch Divider, such as the divider that the divider resistance R1-R2 that is connected between interconnecting nodes NX1 and the second front side node NI2 is constituted； The first switch and the second switch wherein alternately connected is complementary switch, and in the connection period of first switch and second switch The connection period between set dead time D-Time；It is detected according to the voltage sampled in divider intermediate node NS described Current potential commutating period point at interconnecting nodes NX1；The commutation of this current potential is for example switched to negative current potential by positive current potential, or from negative Current potential be switched to positive current potential, pay attention to here so-called positive potential either negative potential be relative to the second front side node NI2 For the current potential having.Finish time of the commutating period point earlier than dead time in each switch periods Cycle-time Then characterization is in Sofe Switch state；The commutating period point is later than the end of dead time in each switch periods Cycle-time Moment then characterizes in hard switching state.It is having the same with the second front side node NI2 and the second rear side node NO2 in Fig. 5 For common reference current potential.Judge that complementary switch is in Sofe Switch state or hard switching state for accurately controlling power switch System is very significant, although because hard switching is easier to realize and drive simply and the complicated switch damage of Sofe Switch topology Consume it is low, in practical application if attempt to clamp down on needed if switching system enters hard switching mode judge whether reached mesh , it is also required to whether judgement has reached purpose if instead attempting to clamp down on switching system and entering sofe switch pattern, this is Switching provides foundation between hard switching and Sofe Switch.

Referring to Fig. 5, resonant capacitance C1-C2 and resonant inductance in figure can be abandoned from topological structure, because from Physical structure upper switch S1-S2 itself due to being power switch such as MOSFET etc., they between source electrode and drain electrode itself There is backward dioded with regard to parasitism, parasitic backward dioded here also can use additional anti-parallel diodes and replace certainly Generation.Such as the first end of switch S1 is connected to front side node NI1, it is so-called that the second end of switch S1 and the first end of switch S2 are connected in Interconnecting nodes NX1, the second end of switch S2 is connected to front side node NI2.Here first end and second end can be drain electrode and source Pole.Switch internal or the reverse phase diode of outside in such a way that anode is connected in second end and cathode is connected in first end and switch simultaneously Connection.Sofe Switch state includes: that connection moment electric current of the switch S1-S2 in each period flows through switch S1-S2 in this embodiment The backward dioded of anti-parallel diodes or parasitism, the voltage for directly resulting in switch S1-S2 are lowered to zero, are whereby switch S1-S2 provides no-voltage and opens mode.

Referring to Fig. 5, in an optional but nonessential embodiment disclosed herein, in conclusion being opened up for this Flutter for framework that there is following drive modes: complementary switch S1-S2 is alternately to connect, and complementary switch S3-S4 is alternating It connects, dead time is equipped between both complementary switch S1-S2 connection, is also equipped between both complementary switch S3-S4 connection Dead time.Those skilled in the art both knows about, and the dead time of so-called complementary switch/recommend switch refers to that two complementations are opened Pass is all disconnected, and the prior art does not judge the scheme of hard switching or Sofe Switch clearly.This application claims open in two groups of complementations It closes in the dead time of S1-S2 and in the dead time of complementary switch S3-S4, the topology to judge voltage conversion is soft or hard to be opened It closes.The present embodiment is the voltage conversion circuit of switch power supply system especially power optimization in any one complete switching cycles The detection method for realizing soft or hard switch, by taking some switch periods as an example: can be remained up in switch S1 but switch S2 keeps closing The disconnected first stage: switch S3 is first connected and switch S4 shutdown then turns off again switch S3 and switch S4 is connected, switch S3 Shutdown and switch S4 connect the second stage for continueing to that switch S1 is switched to shutdown and switch S2 is switched on.First stage is first It passes through and goes through the switching of switch S3 connection and switch S4 shutdown, switch S3 is connected and switch S4 turns off this state and keeps the pre- of segment It fixes time, then undergoes the switching that switch S3 is turned off and switch S4 is connected again.Then it is found that voltage conversion circuit completes the executing It is jumped to again after two-stage and executes the first stage, voltage conversion circuit recycles between second stage in the first stage, completely Switch periods included the first and second stages.The interconnecting nodes NX2 of power optimization device detecting complementary switch S3-S4 in the first stage The current potential commutating period point TC1 at place, the connection of the first stage switch S3 during this embodiment prescribed switch period and this open It closes and is set between S4 connection there are two the first dead time D-Time1 being turned off is switched, in the first stage commutating period point TC1 Finish time earlier than dead time D-Time1 judges voltage conversion circuit for Sofe Switch state, in contrast, in the first rank The finish time that section commutating period point TC1 is later than dead time D-Time1 judges voltage conversion circuit for hard switching state. Current potential commutating period point TC2 at the interconnecting nodes NX1 of second stage power optimization device detecting complementary switch S1-S2, this reality It applies and is switched all there are two being set between the connection of second stage switch S1 during convention determines switch periods and switch S2 connection Second dead time D-Time2 of shutdown, in end of the second stage commutating period point TC2 earlier than dead time D-Time2 Moment judges that voltage conversion circuit for Sofe Switch state, in contrast, is otherwise later than in second stage commutating period point TC2 The finish time of dead time D-Time2 judges voltage conversion circuit for hard switching state.It can be seen that electric in the present embodiment Pressure translation circuit may be switched to the soft of the second commutating period point TC2 by the Sofe Switch or hard switching of the first commutating period point TC1 Switch or hard switching, there are four states.In the preferred embodiment, when due to the duty of driving switch S1-S2 driving signal The duty ratio of the driving signal of driving switch S3-S4 is adjustable, detects the soft or hard switch state of the reality of voltage conversion circuit Preferable stop voltage conversion circuit afterwards are as follows: in each switch periods, adjust the evening at connection moment of switch S4 in the first stage It is later than second stage at the moment of connecting of second stage adjustment switch S2 in first commutating period point TC1 of first stage Second commutating period point TC2.In this embodiment, electric pressure converter can reach very high transfer efficiency and realize extremely low Switch connection loss and/or switch-off power loss.

Above by description and accompanying drawings, the exemplary embodiments of the specific structure of specific embodiment, foregoing invention are given Existing preferred embodiment is proposed, but these contents are not intended as limiting to.For a person skilled in the art, in reading State it is bright after, various changes and modifications undoubtedly will be evident.Therefore, appended claims, which should be regarded as, covers the present invention True intention and range whole variations and modifications.The range of any and all equivalences within the scope of the claim of this application book With content, all it is considered as still belonging to the intent and scope of the invention.

Claims (11)

1. a kind of method that judgement complementary switch is in Sofe Switch state or hard switching state, wherein in first node and the second section First switch and the second switch is connected in series between point, which is characterized in that this method comprises:

The complementary first switch and the second switch of driving is alternately connected；

Dead time is set between the connection period of first switch and the connection period of second switch；

Detect the current potential commutating period point at the interconnecting nodes of first switch and the second switch；

The commutating period point is judged as Sofe Switch state earlier than the finish time of dead time in each switch periods；

The finish time that the commutating period point is later than dead time in each switch periods is judged as hard switching state.

2. according to the method described in claim 1, it is characterized by:

Using the voltage at the interconnecting nodes of a divider sampling first switch and the second switch, detectd according to the voltage of sampling Survey the commutating period point.

3. according to the method described in claim 1, it is characterized by:

It includes the first switch and the second switch that a buck converter, which is arranged,.

4. according to the method described in claim 1, it is characterized by:

It includes the first switch and the second switch that a boost converter, which is arranged,.

5. according to the method described in claim 1, it is characterized by:

The decompression single armed that the type of voltage step-up/down converter of a H bridge type is arranged includes the first switch and the second switch；Or

The boosting single armed that the type of voltage step-up/down converter of a H bridge type is arranged includes the first switch and the second switch.

6. according to the method described in claim 1, it is characterized by:

Inductance is set between a third reference mode at the interconnecting nodes:

The first and second switch of driving is alternately connected, and is generated relative to a predetermined reference current potential at third reference mode by just The AC ripple voltage of string wave rule variation.

7. according to the method described in claim 1, it is characterized by:

First switch and resonant inductance are in series between the interconnecting nodes and first node；

The Sofe Switch state includes:

In the connection stage in each switch periods in the first switch, the parasitic capacitance of the resonant inductance and second switch Or resonance occurs with the shunt capacitance of second switch；

The first switch works in zero current and connects and zero-current switching mode；

The second switch works in no-voltage and connects and zero voltage turn-off mode.

8. according to the method described in claim 1, it is characterized by:

First switch and resonant inductance are in series between the interconnecting nodes and first node；

The Sofe Switch state includes:

In the connection stage in each switch periods in the second switch, the parasitic capacitance of the resonant inductance and first switch Or resonance occurs with the shunt capacitance of first switch；

The first switch works in no-voltage and connects and zero voltage turn-off mode；

The second switch works in zero current and connects and zero-current switching mode.

9. according to the method described in claim 1, it is characterized by:

First switch and resonant inductance are in series between the interconnecting nodes and first node；

The Sofe Switch state includes:

In the connection stage in the first switch in each switch periods, the parasitism electricity of the resonant inductance and second switch Resonance perhaps occurs with the shunt capacitance of second switch, second switch works in no-voltage and connects and zero voltage turn-off mode；

In the connection stage in the second switch in each switch periods, the parasitism electricity of the resonant inductance and first switch Resonance perhaps occurs with the shunt capacitance of first switch, first switch works in no-voltage and connects and zero voltage turn-off mode.

10. according to the method described in claim 1, it is characterized by:

The Sofe Switch state includes:

First or second switch at the connection moment in each period, electric current flow through the first or second switch it is reversed simultaneously The backward dioded of union II pole pipe or parasitism causes the voltage of the first or second switch to be lowered to zero, is whereby described First or second switch provides no-voltage and opens mode.

11. a kind of power switch system that can determine whether in Sofe Switch state or hard switching state characterized by comprising

The first switch and the second switch being connected in series between first node and second node；

The divider of the voltage at interconnecting nodes for sampling first switch and the second switch；

The first switch and the second switch wherein alternately connected is complementary switch, and in the connection period of first switch and second Dead time is set between the connection period of switch；

The current potential commutating period point at the interconnecting nodes is detected according to the voltage of sampling；

The commutating period point is then characterized earlier than the finish time of dead time in Sofe Switch state in each switch periods；

The finish time that the commutating period point is later than dead time in each switch periods then characterizes in hard switching state.