CN101478256A - Soft switch welding inverter, phase-shifting control method and soft switching method - Google Patents
Soft switch welding inverter, phase-shifting control method and soft switching method Download PDFInfo
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- CN101478256A CN101478256A CNA2009100003244A CN200910000324A CN101478256A CN 101478256 A CN101478256 A CN 101478256A CN A2009100003244 A CNA2009100003244 A CN A2009100003244A CN 200910000324 A CN200910000324 A CN 200910000324A CN 101478256 A CN101478256 A CN 101478256A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a soft-switching welding inverter power supply, a phase-shifting control method and a soft-switching method which belong to the electronic circuit field. The soft-switching welding inverter power supply comprises a full-bridge converter and a control module; the phase-shifting control method is applied to the power supply, and comprises the steps as follows: the control module receives current signals of the full-bridge converter, and adjusts dead-zone time of phase-shifting signals based upon the current signals; the soft-switching method is applied to the power supply, and comprises the steps as follows: an auxiliary resonant network is connected with a bridge leg of the power supply in parallel so as to provide subsidiary energy to the zero voltage turning-on of a switching element; before the switching element of a lagging leg on the full-bridge converter is turned off, main power loop current flowing through the switching element is weakened, and the reversion of the main power loop current is restrained; and an absorption capacitor is connected with the switching element in parallel, and the borne rate of voltage rise is slows down when the switching element is turned off. The soft-switching welding inverter power supply, the phase-shifting control method and the soft-switching method realize the zero-voltage zero-current soft-switching in full range of loads including idle load and short circuit.
Description
Technical field
The present invention relates to electronic circuit field, particularly a kind of soft switch welding inverter power source, phase-shifting control method and soft-switching process.
Background technology
Common double Polarity Control full-bridge power converter, no matter transformer secondary output adopts full-wave rectification, bridge rectifier, still doubly flow rectification, as shown in Figure 1, it adopts traditional PWM (Pulse Width Modulation, pulse width modulation) control technology realizes the output characteristic control of power supply, the switching device of primary is operated in the hard switching state, switching device bears very big electric current and voltage stress, there is bigger switching loss, not only reduced the efficient of power supply, and produce bigger EMI (ElectroMagnetic Interference, electromagnetic interference), influence the reliability of power work.
It is one of important development direction of the source of welding current that soft switch technique is combined with inversion transformation technique.Realize the soft switch of device for power switching, can reduce switching loss, improve circuit efficiency, help improving operating frequency, and then improve power density, reduce electric current and voltage stress and EMI that switching device bears simultaneously, improve the reliability of power work.Yet, owing to source of welding current loaded work piece wide ranges, have the situations such as dynamically sharply variation of zero load and short circuit and power source loads, when soft switch technique is applied to welding inverter power source, must solve following key issue: the soft switch of device for power switching of realizing full-load range; Guarantee the soft switch of device for power switching under unloaded and two kinds of maximal work states of short circuit; The soft switch that in the dynamic changing process of power source loads, keeps device for power switching.
The phase shifting control of full bridge power translation circuit is a kind of effective ways of realizing the soft switch of device for power switching zero-pressure, it is on the basis that has kept conventional P WM constant frequency control advantage, utilize the parasitic parameter of device to realize the soft switch of zero-pressure of device for power switching, in middle high power D C/DC (Direct Current, direct current) conversion, obtained using widely.But basic phase shifting control full-bridge zero-pressure soft switch transducer exists the soft switching load of switching device to be limited in scope, and lagging leg particularly can't be realized the problem of the soft switch of zero-pressure of switching device when underloading.
For the soft switching load scope of the zero-pressure of widening phase shifting control full bridge power translation circuit, on basic phase shifting control full bridge inverter basis many improved circuit topologys have appearred.
The key that realizes the wide loading range zero-voltage-switch of lagging leg is an energy, difference according to energy source, circuit topology can be divided into two classes: a class is to run off, utilize the original energy of circuit to realize that the zero-pressure of lagging leg is open-minded by slowing down energy, inserts LCD auxiliary resonant net etc. between pulsactor, primary and the lagging leg as primary or secondary sealing in; Another kind of is open-minded by the zero-pressure of additional additional energy realization lagging leg, as transformer secondary output shunt inductance, lagging leg LC in parallel or LCD auxiliary resonant net etc.
The zero stream of so-called lagging leg turn-offs, and is exactly in the circulation process of phase shifting control full-bridge circuit, and adopting an effective measure also keeps the primary current attenuation to zero, turn-offs until switching device.Circuit topology also can be divided into two classes, one class is that the primary current attenuation is after zero in the circulation process, and electric current has reverse trend, as the capacitance of connecting in primary, need take ancillary method blocking-up current reversal, as series connection pulsactor or diode etc.; Another kind of is after the primary current attenuation is to zero, and electric current remains zero automatically, increases auxiliary transformer network etc. as transformer secondary output passive-clamp, active-clamp, primary.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
The soft switching load scope of zero-pressure that existing many follow-on full bridge soft switch circuit topologys have been widened two arms or lagging leg adopt zero-current soft-switch, but seldom can realize comprising the soft switch of the full-load range two arm device for power switching of Light Condition.
Summary of the invention
Zero-voltage zero-current soft-switch for the full-load range of realizing comprising unloaded and two kinds of maximal work states of short circuit, and in the dynamic changing process of power source loads, keep soft switch, the invention provides a kind of soft switch welding inverter power source, phase-shifting control method and soft-switching process.Described technical scheme is as follows:
A kind of soft switch welding inverter power source comprises: full-bridge converter and control module;
Described full-bridge converter comprises:
First absorbs electric capacity and the 3rd absorbs electric capacity, described first absorbs on first switching device of leading arm that electric capacity is parallel to described full-bridge converter, the described the 3rd absorbs on the 3rd switching device of leading arm that electric capacity is parallel to described full-bridge converter, described first absorbs electric capacity and the described the 3rd absorbs electric capacity, is used for realizing jointly the zero-pressure shutoff of the full-load range of described first switching device and described the 3rd switching device;
Leading arm auxiliary resonant net is parallel to the leading arm of described full-bridge converter, is used to realize that the zero-pressure of full-load range of described first switching device and described the 3rd switching device is open-minded;
Described control module comprises:
The phase shifting control unit that the Dead Time self adaptation is regulated is used to receive the current signal of described full-bridge converter, and regulates the Dead Time of phase shift signal according to described current signal, with the phase shift signal after regulating as control signal.
Described full-bridge transformer also comprises:
Second absorbs electric capacity and the 4th absorbs electric capacity, described second absorbs on the second switch device of lagging leg that electric capacity is parallel to described full-bridge converter, the described the 4th absorbs on the 4th switching device of lagging leg that electric capacity is parallel to described full-bridge converter, described second absorbs electric capacity and the described the 4th absorbs electric capacity, is used for realizing jointly the zero-pressure shutoff of the full-load range of described second switch device and described the 4th switching device;
The lagging leg auxiliary resonant net is parallel to the lagging leg of described full-bridge converter, is used to realize that the zero-pressure of full-load range of described second switch device and described the 4th switching device is open-minded;
Capacitance and pulsactor, described capacitance is series at the primary return of the transformer of described full-bridge converter, be used for electric current at the described primary return of circulation process decay, described pulsactor is series at described capacitance, be used to suppress described primary return electric current oppositely, the common zero-current soft-switch of realizing the full-load range of described second switch device and described the 4th switching device of described capacitance and described pulsactor.
Described control module also comprises:
Driver element is used to receive described control signal, and described control signal is isolated amplification, forms drive signal, drives described full-bridge converter and carries out work.
The phase shifting control unit that described Dead Time self adaptation is regulated is a digital circuit;
According to the described current signal that receives, generate phase shift signal, and described phase shift signal is sent to described driver element corresponding to the Dead Time of described current signal.
The phase shifting control unit that described Dead Time self adaptation is regulated is an analog circuit;
Comprise: phase shifting control subelement and Dead Time are regulated subelement;
Described phase shifting control subelement is used to produce the phase shift signal of initial Dead Time;
Described Dead Time is regulated subelement, is used to receive described current signal, according to described current signal the described phase shift signal that described phase shifting control subelement produces is carried out the adjusting of Dead Time, and the phase shift signal after the adjusting sends to described driver element.
A kind of phase-shifting control method is applied to the described soft switch welding inverter power source of claim 1, and the Dead Time of phase shift signal is that self adaptation is regulated in the described phase-shifting control method, and described phase-shifting control method comprises:
The control module of described soft switch welding inverter power source receives the current signal of the full-bridge converter of described soft switch welding inverter power source, and regulates the Dead Time of phase shift signal according to described current signal.
Also comprise after the described phase-shifting control method:
Phase shift signal after Dead Time is regulated amplifies through isolating as control signal, forms drive signal, drives described full-bridge converter and carries out work.
A kind of soft-switching process is applied to the described soft switch welding inverter power source of claim 1, and described soft-switching process is that same switching device Zero-voltage zero-current combines, and specifically comprises:
Auxiliary resonant net in parallel on the brachium pontis of described power supply for described switching device provides auxiliary energy, realizes that the zero-pressure of full-load range of described device for power switching is open-minded;
Before the switching device of the lagging leg of described soft switch welding inverter power source turn-offs, the main loop of power circuit electric current of described switching device is flow through in decay, and suppress the reverse of described main loop of power circuit electric current, realize the zero-current soft-switch of the full-load range of described lagging leg switching device;
The electric capacity that absorbs in parallel on described switching device, the rate of climb of slowing down the voltage that is born when described switching device turn-offs realizes that the zero-pressure of the full-load range of described switching device is turn-offed.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
By on the leading arm (lead man) of the full-bridge converter of soft switch welding inverter power source and lagging leg, increasing auxiliary resonant net in parallel, opening for the zero-pressure of device for power switching is soft provides additional-energy, and be aided with transformer electric current (as electric power outputting current or primary electric current) and change and the phase-shifting control method of the Dead Time that self adaptation is regulated, can realize comprising the zero-pressure conducting of the full-load range two arm device for power switching of unloaded and short-circuit condition; By the electric capacity that absorbs in parallel on device for power switching, and at primary loop series connection capacitance and pulsactor, the soft shutoff that the Zero-voltage zero-current soft-switch method that cooperates same switching device, the approximate zero-pressure that realizes leading arm device for power switching are turn-offed and the Zero-voltage zero-current of lagging leg device for power switching combines; Thereby soft the opening with soft shutoff that can solve device for power switching effectively is difficult to the problem comprehensively taken into account in full-load range, for efficient, the highly reliable operation of inverter lays the foundation.Can be applicable to simultaneously the large power supply application scenario of other electrical network input and load variations wide ranges.
Description of drawings
Fig. 1 is the circuit topology of basic full-bridge power converter in the prior art;
Fig. 2 is a kind of structural representation of the soft switch welding inverter power source that provides in the embodiment of the invention 1;
Fig. 3 is a kind of circuit topology of the full-bridge converter of the employing auxiliary resonant net that provides in the embodiment of the invention 1;
Fig. 4 is a kind of structural representation of the control module of the soft switch welding inverter power source that provides in the embodiment of the invention 1;
Fig. 5 is a kind of structural representation of the phase shifting control unit regulated of the Dead Time self adaptation that provides in the embodiment of the invention 1;
Fig. 6 is the circuit topology of the auxiliary resonant net of several equivalences of providing in the embodiment of the invention 1;
Fig. 7 is a kind of circuit topology of the full-bridge converter of the employing auxiliary resonant net that provides in the embodiment of the invention 2;
Fig. 8 is the phase-shifted control signal schematic diagram that the Dead Time self adaptation that provides in the embodiment of the invention 3 is regulated;
Fig. 9 is the typical operation of the full bridge soft switch converter of the phase-shifted control signal regulated of the employing that provides in the embodiment of the invention 3 Dead Time self adaptation shown in Figure 8;
Figure 10 is a kind of switching waveform schematic diagram of the lagging leg zero-current soft-switch that provides in the embodiment of the invention 3;
Figure 11 is the soft a kind of switching waveform schematic diagram opened with the soft shutoff of zero-pressure of the leading arm zero-pressure that provides in the embodiment of the invention 3;
Figure 12 is the typical operation of the full bridge soft switch converter of the phase-shifted control signal regulated of the employing that provides in the embodiment of the invention 4 Dead Time self adaptation shown in Figure 8;
To be that the lagging leg zero-pressure that provides in the embodiment of the invention 4 is soft open and combine with zero stream a kind of switching waveform schematic diagram of soft shutoff of zero-pressure Figure 13.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The circuit topology of basic full-bridge converter as shown in Figure 1, the first switching device Q1 and diode D1 parallel connected in reverse phase, second switch device Q2 and diode D2 parallel connected in reverse phase, the 3rd switching device Q3 and diode D3 parallel connected in reverse phase, the 4th switching device Q4 and diode D4 parallel connected in reverse phase.Diode can be to be external in switching device separately, perhaps can be that switching device inside carries.Transformer T is connected between the mid point of the mid point of Q1, Q3 and Q2, Q4.This circuit can adopt traditional bipolarity PWM control technology to control, and also can adopt the phase-shift PWM controlled technology to control.When adopting the phase-shift PWM controlled technology, be called leading arm (lead man) and lagging leg according to the priority that turns on and off of two brachium pontis switching devices, suppose among the present invention that Q1, Q3 are leading arm together with D1, D3, Q2, Q4 are lagging leg together with D2, D4.
Embodiment 1
Present embodiment provides a kind of soft switch welding inverter power source, as shown in Figure 2, and comprising full-bridge converter 201 and control module 202.
Full-bridge converter 201 is used for carrying out work according to the drive signal that control module 202 produces;
The circuit topology of full-bridge converter 201 is as shown in Figure 3:
First absorbs capacitor C 1 and the 3rd absorbs capacitor C 3, and C1 is parallel on the first switching device Q1 of leading arm, and C3 is parallel on the 3rd switching device Q3 of leading arm, and C1 and C3 are used for realizing jointly that the approximate zero-pressure of the full-load range of Q1 and Q3 turn-offs;
Leading arm auxiliary resonant net, the auxiliary resonance capacitor C a1, the Ca3 that comprise two series connection are parallel on the leading arm, auxiliary resonance inductance L a1 is connected on the mid point of leading arm Q1, Q3 and the auxiliary resonance capacitor C a1 of two series connection, the mid point of Ca3, is used to realize that the zero-pressure of full-load range of Q1 and Q3 is open-minded;
Capacitance Cb and pulsactor Lb, capacitance Cb is series at the primary return of transformer T, be used for electric current at circulation process decay primary return, pulsactor Lb is series at capacitance Cb, be used to suppress primary return electric current oppositely, capacitance Cb and pulsactor Lb are used for realizing jointly the approximate zero current soft-switch of the full-load range of Q2 and Q4.
As shown in Figure 4, control module 202 comprises: phase shifting control unit 202A, driver element 202B that the Dead Time self adaptation is regulated.
The phase shifting control unit 202A that the Dead Time self adaptation is regulated is used to receive the current signal of full-bridge converter 201, and regulates the Dead Time of phase shift signal according to this current signal, and the phase shift signal after the adjusting is a control signal, sends to driver element;
The phase shifting control unit 202A that the Dead Time self adaptation is regulated can be digital circuit, perhaps is analog circuit;
When the phase shifting control unit 202A of Dead Time self adaptation adjusting is digital circuit, according to the current signal that receives, generates phase shift signal, and this phase shift signal is sent to driver element 202B corresponding to the Dead Time of current signal.The phase shifting control unit 202A that the Dead Time self adaptation is regulated can use DSP (Digital Signal Processor, digital signal processor) or MCU (Microprocessor Control Unit, MCU Microprocessor Control Unit) realizes digitized phase shifting control, and realize the self adaptation adjusting of Dead Time by software programming;
When the phase shifting control unit 202A of Dead Time self adaptation adjusting was analog circuit, referring to Fig. 5, the phase shifting control unit 202A that the Dead Time self adaptation is regulated comprises: phase shifting control subelement 202A1 and Dead Time were regulated subelement 202A2;
Phase shifting control subelement 202A1 is used to produce the phase shift signal of initial Dead Time, and this unit can adopt special-purpose integrated phase shifting control chip, as UC3875 or UC3879 etc.;
Dead Time is regulated subelement 202A2, be used for the received current signal, according to current signal the phase shift signal that phase shifting control subelement 202A1 produces is carried out the adjusting on a large scale of Dead Time, the phase shift signal after the adjusting sends to driver element 202B as control signal.Dead Time is regulated subelement and can be adopted the circuit of time-base circuit 555 or similar functions to realize.
Leading arm auxiliary resonant net can adopt multiple circuit topology form, and as shown in Figure 6, the effect of several auxiliary resonant nets is equivalent.Fig. 6 (a) is depicted as a kind of auxiliary resonant net on the leading arm, auxiliary resonance electric capacity and an auxiliary resonance inductance by two series connection are formed a three-terminal network, be connected in parallel on the leading arm after two auxiliary resonance capacitances in series, connect an auxiliary resonance inductance between the mid point of the mid point of the auxiliary resonance electric capacity of two series connection in parallel and leading two switching devices of arm on the leading arm.The auxiliary resonant net that the auxiliary resonant net of Fig. 6 (a) is adopted in the circuit topology shown in the present embodiment just.Fig. 6 (b) and Fig. 6 (c) are the forms of the both-end auxiliary resonant net that unites two into one of two auxiliary resonance electric capacity of connecting with the auxiliary resonant net among Fig. 6 (a), auxiliary resonance electric capacity and the series connection of auxiliary resonance inductance constitute the both-end auxiliary resonant net, one end of both-end auxiliary resonant net links to each other with the mid point of two switching devices of leading arm, the other end then link to each other with the positive ends of input DC power (shown in Fig. 6 (b)) or link to each other with the negative polarity end of input DC power (shown in Fig. 6 (c)).Fig. 6 (d) is on the basis of the three end auxiliary resonant nets of being made up of the auxiliary resonance electric capacity of two series connection and auxiliary resonance inductance shown in Fig. 6 (a), in the form of the auxiliary resonance electric capacity two ends of two series connection difference reverse parallel connection fast recovery diode, fast recovery diode has played clamp auxiliary resonance capacitance voltage and the effect of afterflow path is provided for the auxiliary resonance inductive current.
Present embodiment is by auxiliary resonant net in parallel on the leading arm of full-bridge converter, opening for the zero-pressure of the device for power switching on the leading arm provides additional-energy, and parallel connection absorbs the approximate zero-pressure shutoff that electric capacity is realized leading arm device for power switching on the device for power switching of leading arm, the series connection capacitance is realized the decay of primary return electric current in the circulation process on the primary return of transformer, the pulsactor of connecting suppresses the reverse of primary return electric current, realizes that the shutoff of approximate zero stream and the approximate zero stream of lagging leg device for power switching is open-minded.Control module is according to transformer current (as elementary electric current or electric power outputting current), regulate the Dead Time of the device for power switching switching of leading arm and lagging leg adaptively, the phase-shifted control signal that the Dead Time self adaptation is regulated is through isolating the device for power switching that amplifies the rear drive full-bridge converter, turning on and off of control switch device, realized that soft switch welding inverter power source comprises the full-load range Zero-voltage zero-current soft-switch of unloaded and short-circuit condition, wherein leading arm is that the zero-pressure shutoff is opened and be similar to zero-pressure, lagging leg is opened with approximate zero stream for approximate zero stream and is turn-offed, and in the dynamic changing process of power source loads, can both keep the soft switch of device for power switching.Soft the opening with soft shutoff that solves device for power switching effectively is difficult to the problem taken into account in full-load range, for efficient, the highly reliable operation of inverter lays the foundation.Can be applicable to simultaneously the large power supply application scenario of other electrical network input and load variations wide ranges.
Embodiment 2
Present embodiment provides a kind of soft switch welding inverter power source, as shown in Figure 2, and comprising full-bridge converter 201 and control module 202.The circuit topology of full-bridge converter 201 is as shown in Figure 7:
First absorbs capacitor C 1 and the 3rd absorbs capacitor C 3, and C1 is parallel on the first switching device Q1 of leading arm, and C3 is parallel on the 3rd switching device Q3 of leading arm, and C1 and C3 are used for realizing jointly that the approximate zero-pressure of the full-load range of Q1 and Q3 turn-offs;
Leading arm auxiliary resonant net, the auxiliary resonance capacitor C a1, the Ca3 that comprise two series connection are parallel on the leading arm, auxiliary resonance inductance L a1 is connected on the mid point of leading arm Q1, Q3 and the auxiliary resonance capacitor C a1 of two series connection, the mid point of Ca3, is used to realize that the zero-pressure of full-load range of Q1 and Q3 is open-minded;
Second absorbs capacitor C 2 and the 4th absorbs capacitor C 4, and C2 is parallel on the second switch device Q2 of lagging leg, and C4 is parallel on the 4th switching device Q4 of lagging leg, and C2 and C4 are used for realizing jointly that the approximate zero-pressure of the full-load range of Q2 and Q4 turn-offs;
The lagging leg auxiliary resonant net, the auxiliary resonance capacitor C a2, the Ca4 that comprise two series connection are parallel on the lagging leg, auxiliary resonance inductance L a2 is connected on the mid point of lagging leg Q2, Q4 and the auxiliary resonance capacitor C a2 of two series connection, the mid point of Ca4, is used to realize that the zero-pressure of full-load range of Q2 and Q4 is open-minded;
Capacitance Cb and pulsactor Lb, capacitance Cb is series at the primary return of transformer T, be used for electric current at circulation process decay primary return, pulsactor Lb is series at capacitance Cb, be used to suppress primary return electric current oppositely, capacitance Cb and pulsactor Lb are used for realizing jointly the approximate zero current soft-switch of second switch device Q2 and the 4th switching device Q4.
The lagging leg auxiliary resonant net also can adopt multiple circuit topology form, and is similar to the Fig. 6 among the embodiment 1, no longer describes in detail herein.
Present embodiment passes through auxiliary resonant net in parallel on the leading arm of full-bridge converter and lagging leg, opening for the zero-pressure of the device for power switching on two arms provides additional-energy, and parallel connection absorbs the approximate zero-pressure shutoff that electric capacity is realized two arm device for power switching on the device for power switching of two arms, the series connection capacitance is realized the decay of primary return electric current in the circulation process on the primary return of transformer, series connection pulsactor inhibition primary return electric current is reverse on the primary return of transformer, and the approximate zero stream of realization lagging leg device for power switching turn-offs and approximate zero flows open-minded.Control module is regulated the Dead Time of the device for power switching switching of leading arm and lagging leg adaptively according to transformer current (as elementary electric current or electric power outputting current), the phase-shifted control signal that the Dead Time self adaptation is regulated is through isolating the device for power switching that amplifies the rear drive full-bridge converter, turning on and off of control switch device, realized that soft switch welding inverter power source comprises the full-load range Zero-voltage zero-current soft-switch of unloaded and short-circuit condition, wherein leading arm is that the zero-pressure shutoff is opened and be similar to zero-pressure, lagging leg is that zero-pressure is opened the soft shutoff that combines with zero stream with zero-pressure, and in the dynamic changing process of power source loads, can both keep the soft switch of device for power switching.Thereby soft the opening with soft shutoff that solves device for power switching effectively is difficult to the problem taken into account in full-load range, for efficient, the highly reliable operation of inverter lays the foundation.Can be applicable to simultaneously the large power supply application scenario of other electrical network input and load variations wide ranges.
Embodiment 3
Present embodiment provides a kind of phase-shifting control method, is applied to the soft switch welding inverter power source described in embodiment 1 and the embodiment 2.Here be example with the soft switch welding inverter power source among the embodiment 1.
In the full-bridge converter of phase shifting control, the realization of soft switch requires Dead Time that the switching device of leading arm and lagging leg switches and the energy cooperation in the circuit, and the phase-shifting control method that the Dead Time self adaptation is regulated is meant that the Dead Time that the device for power switching of leading arm and lagging leg switches reduces along with the increase of transformer current (as primary electric current or electric power outputting current), wherein the scope of the Dead Time of leading arm adjusting is bigger, and the scope that the Dead Time of lagging leg is regulated is less, lagging leg even can adopt a certain fixing Dead Time under certain parameter matching.
Q1 among the figure is the control signal of first switching device of leading arm, the control signal of the 3rd switching device that Q3 is leading arm, Q2 is the control signal of the second switch device of lagging leg, the control signal of the 4th switching device that Q4 is lagging leg, low level representation switch device turn-offs, high level representation switch break-over of device.A, b time period are the Dead Time of leading arm, and c, d time period are the Dead Time of lagging leg.If the transformer current in the full-bridge converter 201 (as elementary electric current or electric power outputting current) increases, the Dead Time of two arms then shown in Figure 8 can correspondingly reduce.And the scope that the Dead Time that leading arm switch device switches is regulated is bigger, and the scope that the Dead Time that the lagging leg switching device switches is regulated is less.In some cases, open-minded before the corresponding switching device of lagging leg in order to guarantee the corresponding switching device of leading arm, open-minded before Q4 as Q1, perhaps Q3 is open-minded before Q2, can suitably limit the phase shifting angle or the effective impulse width of control impuls, effectively the control impuls width is shown in the e among Fig. 8, f time period.
Soft switch welding inverter power source among the embodiment 1, the phase-shifting control method that adopts the Dead Time self adaptation to regulate, regulate the Dead Time of phase shift signal according to the transformer current (as elementary electric current or electric power outputting current) of full-bridge converter 201, phase shift signal after regulating is isolated amplification, form drive signal, drive full-bridge converter 201 and carry out work, specifically the course of work is as shown in Figure 9:
901: switching device Q1 and Q4 are in conducting state, and transformer T's is elementary to secondary transmission energy, the auxiliary resonance inductance L a1 energy storage in the leading arm auxiliary resonant net, and this section period is determined by duty ratio.
902: drive signal is turn-offed Q1, and the electric current among the electric current of the primary return of transformer and the auxiliary resonance inductance L a1 makes first to absorb capacitor C 1 charging, 3 discharges of the 3rd absorption capacitor C jointly.Because C1, C3 capacitance are bigger, so the voltage of C1 is slowly to rise, thereby the approximate zero-pressure that has realized Q1 is turn-offed; After the voltage of C1 rises to supply voltage, and the voltage of C3 drops to zero, the D3 conducting, with the voltage clamp of Q3 in zero, for Q3 has created the condition that zero-pressure is opened.
Electric current among the 903:La1 is by the D3 afterflow, and it is open-minded that drive signal makes the Q3 zero-pressure during this period.
Turn-off the time of opening from Q1 to Q3, be the Dead Time (being the b time period among Fig. 8) of leading arm, this section period is carried out the self adaptation adjusting by the control module 202 of soft switch welding inverter power source according to the variation of the electric current (as the electric current in elementary loop or the output current of power supply) of transformer, to guarantee realizing that in the full-load range zero-pressure of Q3 is open-minded.
904: after inductance L a1 in the auxiliary resonant net and capacitor C a1, Ca3 resonance, the electric current among the La1 constantly are decreased to zero, oppositely increase, capacitor C a1 charging, Ca3 discharge, the energy storage of inductance L a1 will be opened for the zero-pressure of second cycle Q1 energy condition will be provided.
905:D3 (or Q3), Q4 are in conducting state, and the electric current of the primary return of transformer is in the circulation state, turn-off until Q4.
In the whole circulation stage, transformer secondary output is in the afterflow state basically or fully, the short circuit of transformer primary and secondary, make the electric current of primary return of transformer under the effect of capacitance Cb, to descend with fast speeds, after the electric current of the primary return of transformer drops to the saturation current that is lower than pulsactor Lb, pulsactor enters unsaturated state, thereby has suppressed the current reversal of the primary return of transformer.
906: drive signal is turn-offed Q4, and this moment, the electric current of primary return of transformer was very little or be reduced to zero, thus realized lagging leg approximate or completely zero stream turn-off.
907: because the effect of pulsactor Lb, the reverse increase of the electric current of the primary return of transformer is suppressed, thereby the approximate zero stream of having realized Q2 is open-minded.
Turn-off the time of opening from Q4, be the Dead Time (being the d time period among Fig. 8) of lagging leg to Q2.
908: switching device Q3 and Q2 are in conducting state, transformer elementary to secondary transmission energy, and the inductance L a1 energy storage in the leading arm auxiliary resonant net, this section period is determined by duty ratio.
909: circuit begins the course of work in later half cycle, with the course of work of preceding half period symmetry fully.
The phase-shifting control method that utilizes the Dead Time self adaptation to regulate, lagging leg has realized comprising the approximate zero current turning-on and the approximate zero-current switching of the full-load range of unloaded and short-circuit condition, electric current and voltage typical waveform on the switching device as shown in figure 10, the abscissa express time, ordinate is represented the voltage and current on the switching device Q2 (or Q4), voltage waveform on curve V (fine rule) the expression switching device Q2 (or Q4), the current waveform on curve A (thick line) the expression switching device Q2 (or Q4).For the amount of capacity of certain electric power outputting current or primary current range, transformer leakage inductance size and switching device parasitic capacitance, the circuit topology of the full-bridge converter 201 shown in the embodiment 1 is more reasonable for the soft switch of lagging leg.
Leading arm has realized comprising that the zero-pressure of the full-load range of unloaded and short-circuit condition opens and be similar to the zero-pressure shutoff, the exemplary voltages current waveform of leading arm switch device as shown in figure 11, the abscissa express time, ordinate is represented the voltage and current on the switching device Q1 (or Q3), voltage waveform on curve V (fine rule) the expression switching device Q1 (or Q3), the current waveform of curve A (thick line) expression switching device Q1 (or Q3).Reverse electric current is the electric current on the diode D1 (or D3) of switching device Q1 (or Q3) reverse parallel connection.
Present embodiment is applied to soft switch welding inverter power source among the embodiment 1 by the phase-shifting control method that the Dead Time self adaptation is regulated, wherein the Dead Time adjustable range of leading arm is bigger, the Dead Time adjustable range of lagging leg is less, realized that leading arm comprises that the zero-pressure of the full-load range of unloaded and short-circuit condition opens and be similar to the zero-pressure shutoff, lagging leg has realized that approximate zero stream is opened and approximate zero flows shutoff, and in the dynamic changing process of power source loads, the soft switch that can both keep device for power switching, efficient for inverter, highly reliable operation is laid a good foundation.Simultaneously, the embodiment of the invention goes for the large power supply application scenario of other electrical network input and load variations wide ranges.
Embodiment 4
Present embodiment provides a kind of soft-switching process, is applied to the soft switch welding inverter power source described in the embodiment 2.
Soft switch welding inverter power source among the embodiment 2 on the basis of the phase-shifting control method that adopts the Dead Time self adaptation to regulate, is used soft-switching process, makes lagging leg realize the soft switch that the Zero-voltage zero-current of full-load range combines.
Regulate the Dead Time of phase shift signal according to the transformer current (as elementary electric current or electric power outputting current) of full-bridge converter 201, phase shift signal after regulating is isolated amplification, form drive signal, drive full-bridge converter 201 and carry out work, specifically the course of work is as shown in figure 12:
1201: switching device Q1 and Q4 are in conducting state, and transformer T's is elementary to secondary transmission energy, auxiliary resonance inductance L a1 in the two arm auxiliary resonant nets and La2 energy storage, and this section period is determined by duty ratio.
1202: drive signal is turn-offed Q1, and the electric current among the electric current of the primary return of transformer and the auxiliary resonance inductance L a1 makes first to absorb capacitor C 1 charging, 3 discharges of the 3rd absorption capacitor C jointly.Because C1, C3 capacitance are bigger, so the voltage of C1 is slowly to rise, thereby the approximate zero-pressure that has realized Q1 is turn-offed; After the voltage of C1 rises to supply voltage, and the voltage of C3 drops to zero, the D3 conducting, with the voltage clamp of Q3 in zero, for Q3 has created the condition that zero-pressure is opened.
Electric current among the 1203:La1 is by the D3 afterflow, and it is open-minded that drive signal makes the Q3 zero-pressure during this period.
Turn-off the time of opening from Q1 to Q3, be the Dead Time (being the b time period among Fig. 8) of leading arm, this section period is carried out the self adaptation adjusting by the control module 202 of soft switch welding inverter power source according to the variation of the electric current (as the electric current in elementary loop or the output current of power supply) of transformer, to guarantee realizing that in the full-load range zero-pressure of Q3 is open-minded.
1204: after inductance L a1 in the auxiliary resonant net and capacitor C a1, Ca3 resonance, the electric current among the La1 constantly are decreased to zero, oppositely increase, capacitor C a1 charging, Ca3 discharge, the energy storage of inductance L a1 will be opened for the zero-pressure of second cycle Q1 energy condition will be provided.
1205:D3 (or Q3), Q4 are in conducting state, and the electric current of the primary return of transformer is in the circulation state, turn-off until Q4.
In the whole circulation stage, the secondary loop of transformer is in the afterflow state basically or fully, the primary and secondary short circuit of transformer, make the electric current of primary return of transformer under the effect of capacitance Cb, to descend with fast speeds, the electric current in primary loop has obtained decay largely, thereby zero stream shutoff or the approximate zero stream of having realized the lagging leg switching device turn-off.
1206: drive signal is turn-offed Q4, electric current among the auxiliary resonance inductance L a2 of primary residual current (in some cases may be reverse) and lagging leg makes C4 charging, C2 discharge jointly, because C2, C4 have certain capacitance, limited the rate of climb that C4 goes up voltage, thereby realized that Q4 flows approximate zero-pressure soft shutoff on the soft shutoff basis in approximate zero; The electric current of the primary return of transformer T drops to the saturation current that is lower than pulsactor Lb (perhaps circulation stage just less than saturation current) fast, pulsactor Lb enters unsaturated state, thereby the primary return from transformer T that the electric current of the auxiliary resonance inductance L a2 of lagging leg can be not too much is run off.After the voltage of C4 rises to supply voltage, and the voltage of C2 drops to zero, the conducting of D2 nature, with the voltage clamp of Q2 in zero, for Q2 has created the condition that zero-pressure is opened.
1207: the electric current among the auxiliary resonance inductance L a2 of lagging leg is by the D2 afterflow and constantly descend, and the electric current in auxiliary resonance inductance L a2 is not less than before the absolute value of elementary reverse current of transformer T, and drive signal makes the Q2 zero-pressure open-minded.
Turn-off the time of opening from Q4 to Q2, be the Dead Time (referring to the d time period among Fig. 8) of lagging leg, the Dead Time of lagging leg is insensitive to the variation of transformer current (as electric power outputting current), only need dynamically to finely tune, to guarantee realizing that in the full-load range zero-pressure of Q2 is open-minded according to the variation of transformer current; Under certain circuit parameter coupling, even can adopt a certain fixing Dead Time.
1208: inductance L a2 in the lagging leg auxiliary resonant net and capacitor C a2, Ca4 resonance, the electric current among the inductance L a2 are decreased to zero back oppositely to be increased, capacitor C a4 charging, Ca2 discharge; The energy storage of inductance L a2 will be opened for the zero-pressure of second cycle Q4 energy condition will be provided.Switching device Q3 and Q2 are in conducting state, transformer elementary to secondary transmission energy, and inductance L a1 in the two arm auxiliary resonant nets and La2 energy storage, this section period is determined by duty ratio.
1209: circuit begins the course of work in later half cycle, with the course of work of preceding half period symmetry fully; No longer describe in detail herein.
The phase-shifting control method that utilizes the Dead Time self adaptation to regulate, leading arm has realized comprising soft the opening and the soft shutoff of approximate zero-pressure of full-load range zero-pressure of unloaded and short-circuit condition, the exemplary voltages current waveform of leading arm switch device as shown in figure 11, wherein, the abscissa express time, ordinate is represented the voltage and current on the switching device Q1 (or Q3), voltage waveform on curve V (fine rule) the expression switching device Q1 (or Q3), the current waveform of curve A (thick line) expression switching device Q1 (or Q3).Reverse electric current is the electric current on the diode D1 (or D3) of switching device Q1 (or Q3) reverse parallel connection.
Lagging leg has realized comprising the soft shutoff that the zero-pressure of the full-load range of unloaded and short-circuit condition is opened and zero-pressure combines with zero stream, the exemplary voltages current waveform of lagging leg switching device as shown in figure 13, wherein, the abscissa express time, ordinate is represented the voltage and current on the switching device Q2 (or Q4), voltage waveform on curve V (fine rule) the expression switching device Q2 (or Q4), the current waveform on curve A (thick line) the expression switching device Q2 (or Q4).Reverse electric current is the electric current on the diode D2 (or D4) of switching device Q2 (or Q4) reverse parallel connection.
Present embodiment is applied to soft switch welding inverter power source described in the embodiment 2 by the soft-switching process that same switching device Zero-voltage zero-current is combined, leading arm has realized comprising soft the opening and the soft shutoff of approximate zero-pressure of zero-pressure of the full-load range of unloaded and short circuit, lagging leg has realized comprising that the zero-pressure of full-load range of unloaded and short-circuit condition is soft opens the soft shutoff that combines with Zero-voltage zero-current, and in the dynamic changing process of power source loads, the soft switch that can both keep device for power switching, efficient for inverter, highly reliable operation is laid a good foundation.Simultaneously, the embodiment of the invention goes for the large power supply application scenario of other electrical network input and load variations wide ranges.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of soft switch welding inverter power source is characterized in that, described soft switch welding inverter power source comprises: full-bridge converter and control module;
Described full-bridge converter comprises:
First absorbs electric capacity and the 3rd absorbs electric capacity, described first absorbs on first switching device of leading arm that electric capacity is parallel to described full-bridge converter, the described the 3rd absorbs on the 3rd switching device of leading arm that electric capacity is parallel to described full-bridge converter, described first absorbs electric capacity and the described the 3rd absorbs electric capacity, is used for realizing jointly the zero-pressure shutoff of the full-load range of described first switching device and described the 3rd switching device;
Leading arm auxiliary resonant net is parallel to the leading arm of described full-bridge converter, is used to realize that the zero-pressure of full-load range of described first switching device and described the 3rd switching device is open-minded;
Described control module comprises:
The phase shifting control unit that the Dead Time self adaptation is regulated is used to receive the current signal of described full-bridge converter, and regulates the Dead Time of phase shift signal according to described current signal, with the phase shift signal after regulating as control signal.
2, soft switch welding inverter power source as claimed in claim 1 is characterized in that, described full-bridge transformer also comprises:
Second absorbs electric capacity and the 4th absorbs electric capacity, described second absorbs on the second switch device of lagging leg that electric capacity is parallel to described full-bridge converter, the described the 4th absorbs on the 4th switching device of lagging leg that electric capacity is parallel to described full-bridge converter, described second absorbs electric capacity and the described the 4th absorbs electric capacity, is used for realizing jointly the zero-pressure shutoff of the full-load range of described second switch device and described the 4th switching device;
The lagging leg auxiliary resonant net is parallel to the lagging leg of described full-bridge converter, is used to realize that the zero-pressure of full-load range of described second switch device and described the 4th switching device is open-minded;
Capacitance and pulsactor, described capacitance is series at the primary return of the transformer of described full-bridge converter, be used for electric current at the described primary return of circulation process decay, described pulsactor is series at described capacitance, be used to suppress described primary return electric current oppositely, the common zero-current soft-switch of realizing the full-load range of described second switch device and described the 4th switching device of described capacitance and described pulsactor.
3, soft switch welding inverter power source as claimed in claim 1 is characterized in that described control module also comprises:
Driver element is used to receive described control signal, and described control signal is isolated amplification, forms drive signal, drives described full-bridge converter and carries out work.
4, the soft switch welding inverter power source described in claim 3 is characterized in that, the phase shifting control unit that described Dead Time self adaptation is regulated is a digital circuit;
According to the described current signal that receives, generate phase shift signal, and described phase shift signal is sent to described driver element corresponding to the Dead Time of described current signal.
5, the soft switch welding inverter power source described in claim 3 is characterized in that, the phase shifting control unit that described Dead Time self adaptation is regulated is an analog circuit;
Comprise: phase shifting control subelement and Dead Time are regulated subelement;
Described phase shifting control subelement is used to produce the phase shift signal of initial Dead Time;
Described Dead Time is regulated subelement, is used to receive described current signal, according to described current signal the described phase shift signal that described phase shifting control subelement produces is carried out the adjusting of Dead Time, and the phase shift signal after the adjusting sends to described driver element.
6, a kind of phase-shifting control method is applied to the described soft switch welding inverter power source of claim 1, it is characterized in that, the Dead Time of phase shift signal is that self adaptation is regulated in the described phase-shifting control method, and described phase-shifting control method comprises:
The control module of described soft switch welding inverter power source receives the current signal of the full-bridge converter of described soft switch welding inverter power source, and regulates the Dead Time of phase shift signal according to described current signal.
7, phase-shifting control method as claimed in claim 5 is characterized in that, also comprises after the described phase-shifting control method:
Phase shift signal after Dead Time is regulated amplifies through isolating as control signal, forms drive signal, drives described full-bridge converter and carries out work.
8, a kind of soft-switching process is applied to the described soft switch welding inverter power source of claim 1, it is characterized in that, described soft-switching process is that same switching device Zero-voltage zero-current combines, and specifically comprises:
Auxiliary resonant net in parallel on the brachium pontis of described power supply for described switching device provides auxiliary energy, realizes that the zero-pressure of full-load range of described device for power switching is open-minded;
Before the switching device of the lagging leg of described soft switch welding inverter power source turn-offs, the main loop of power circuit electric current of described switching device is flow through in decay, and suppress the reverse of described main loop of power circuit electric current, realize the zero-current soft-switch of the full-load range of described lagging leg switching device;
The electric capacity that absorbs in parallel on described switching device, the rate of climb of slowing down the voltage that is born when described switching device turn-offs realizes that the zero-pressure of the full-load range of described switching device is turn-offed.
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