CN104242439B - A kind of alternating current-direct current is without delay switching method and switched system - Google Patents
A kind of alternating current-direct current is without delay switching method and switched system Download PDFInfo
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- CN104242439B CN104242439B CN201410435203.3A CN201410435203A CN104242439B CN 104242439 B CN104242439 B CN 104242439B CN 201410435203 A CN201410435203 A CN 201410435203A CN 104242439 B CN104242439 B CN 104242439B
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Abstract
The present invention relates to power supply unit technical field, disclose a kind of alternating current-direct current without delay switching method system.The positive and negative bus of direct current supply line is connected respectively an one-way SCR, a bidirectional triode thyristor of connecting respectively in the both threads of ac power supply line；Select suitable switching time according to the instant voltage of alternating current-direct current, control each controllable silicon and complete switching by the conducting of corresponding rule with disconnection.Technical scheme have employed the static handoff technique without switching time, it is to avoid instant cut-off gap during physics switching and physical contact phenomenon of arc discharge；Described technical scheme have employed a small amount of electronic devices and components, simplify circuit structure, reduce fault rate, improve the reliability of system, it is simultaneously achieved the static switching without switching time of supplied by AC/DC electricity, drastically increases safety and the unfailing performance of electric power system.
Description
Technical field
The invention belongs to power supply unit technical field, relate to the handoff technique of the system of supplying power with double circuit, specifically Alternating Current Power Supply and HVDC power between without the static handoff technique of time delay.
Background technology
Along with the universal of HVDC (HVDC) electric power system and application, direct current supply is applied in every field.Although HVDC is powered has significantly high reliability, but when battery power is about to exhaust or when DC suppling equipment overhauls, in the situation having other standby alternating current power supplys to exist, it is necessary to direct current supply to be switched to standby Alternating Current Power Supply.When HVDC restores electricity or has overhauled, need that again standby Alternating Current Power Supply is switched to HVDC and power.For core for the electrical equipment of sensitivity, HVDC with exchange between switching must be without switching time, and there is significantly high reliability requirement.
For solving the switching between HVDC and exchange in prior art, relay is generally utilized to realize switching, although utilizing, relay cost is low, circuit simply easily realizes, but with the relay of physical contact be coil electricity with power-off to control adhesive and the disjunction of physical contact, response speed is limited, generally it is above 10 milliseconds, it is impossible to meet the requirement without switching time.When existing common relay is applied to direct current break-make simultaneously, its breaking capacity is substantially reduced, it is easy to produce phenomenon of arc discharge, and disjunction voltage is substantially reduced, and is usually less than below 100V.So common relay cannot be applied in the high-power switching of HVDC (DC200V ~ DC290V).
Summary of the invention
For vacancy and the deficiency of prior art, how the present invention solves the switching between HVDC and Alternating Current Power Supply, to meet high reliability and the requirement without switching time simultaneously.
For solving the problems referred to above, the invention provides a kind of alternating current-direct current without delay switching method, an one-way SCR of first connecting respectively in the positive and negative bus of direct current supply line, a bidirectional triode thyristor of connecting respectively in the both threads of ac power supply line；
When needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, two the bidirectional triode thyristor forward conductions loaded in ac power supply line control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, and control after pole tensions load, to load two bidirectional triode thyristor reverse-conductings control pole tensions at two bidirectional triode thyristor forward conductions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, turn before bearing, cancel two bidirectional triode thyristor forward conductions in ac power supply line and control pole tensions, reverse-conductings control pole tension；Control after pole tensions cancel at two bidirectional triode thyristor reverse-conductings, ac input end voltage turn negative before, two one-way SCRs loaded in direct current supply line control pole tensions.
Preferably, when needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, two the bidirectional triode thyristor forward conductions loaded in ac power supply line control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, loads two bidirectional triode thyristor reverse-conductings control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, cancel bidirectional triode thyristor forward conduction control pole tension, reverse-conducting control pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and after bidirectional triode thyristor reverse-conducting control pole tension is cancelled, two one-way SCRs loaded in direct current supply line control pole tensions.
This preferred version can ensure that system output no-voltage saltus step during switching.
Based on said method, the present invention proposes a kind of alternating current-direct current without time delay switched system, including:
System output, with output AC or unidirectional current, including the first outfan and the second outfan；
Ac power supply line, for input AC electricity, it is made up of ac input end and two bidirectional triode thyristors, the first input end of described ac input end and the second input connect one end of two bidirectional triode thyristors respectively, and the other end of two bidirectional triode thyristors distinguishes the first outfan and second outfan of welding system outfan；
Direct current supply line, for input dc power, it is made up of direct-flow input end and two one-way SCRs, the positive input of described direct-flow input end terminates the anode of the first one-way SCR, first outfan of the negative electrode welding system outfan of the first one-way SCR, negative input terminates the negative electrode of the second one-way SCR, the second outfan of the anode welding system outfan of the second one-way SCR；
Voltage detecting circuit, Sample AC input terminal voltage and direct-flow input end voltage, and export to controller；
Control switching circuit, including the signal input part being connected with the signal output interface of controller, control, with each bidirectional triode thyristor and each of one-way SCR, the break-make control end that pole is connected respectively, receive the voltage that controller signals loads or cancels corresponding SCR control pole；
Controller, judges the immediate status of ac input end voltage according to the live signal of voltage detecting circuit transmission；
Described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, output loads two bidirectional triode thyristor forward conductions in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, and bidirectional triode thyristor forward conduction controls after pole tension loads, and output loads two bidirectional triode thyristor reverse-conductings in ac power supply line and controls the instruction of pole tensions；
Described controller receives and exchanges the switching command switching to direct current, after ac input end voltage is become a full member, turns before bearing, and output is cancelled two bidirectional triode thyristor forward conductions in ac power supply line and controlled pole tension and the instruction of reverse-conducting control pole tension；Control after pole tension cancels at bidirectional triode thyristor reverse-conducting, ac input end voltage turn negative before, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
Preferably, described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, output loads two bidirectional triode thyristor forward conductions in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, output loads two bidirectional triode thyristor reverse-conductings in ac power supply line and controls the instruction of pole tensions；
Described controller receives exchange and switches to the switching command of direct current, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, output is cancelled bidirectional triode thyristor forward conduction in ac power supply line and is controlled pole tension and reverse-conducting controls the instruction of pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and bidirectional triode thyristor reverse-conducting controls after pole tension cancels, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
The present invention takes full advantage of silicon controlled operating characteristic, utilizes the sinusoidal variations feature of alternating voltage to turn off the switching that unidirectional current realizes between alternating current-direct current cleverly.The electronic devices and components adopted are all existing products ripe on the market, have fully ensured that the high safety reliability of switched system.
In said method of the present invention and system, each described bidirectional triode thyristor can be replaced by a pair one-way SCR, and one-way SCR is parallel with one another and closure is contrary for two of a centering；That is, an one-way SCR anode of a centering connects ac power input end, negative electrode welding system outfan, and another one-way SCR negative electrode connects ac power input end, anode welding system outfan.
After being replaced silicon symmetrical switch by a pair one-way SCR, preceding method develops into: a kind of alternating current-direct current is without delay switching method, first connect respectively in the positive and negative bus of direct current supply line an one-way SCR, a pair mutually opposing one-way SCR in parallel of connecting respectively in the both threads of ac power supply line；
When needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, load two one-way SCRs being responsible for forward conduction in ac power supply line and control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn before bearing, and after two one-way SCRs of responsible forward conduction control pole tension loading, load two one-way SCRs being responsible for reverse-conducting in ac power supply line and control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, turn before bearing, cancel four one-way SCRs in ac power supply line and control pole tension；Control after pole tensions cancel at two one-way SCRs of responsible reverse-conducting, ac input end voltage turn negative before, two one-way SCRs loaded in direct current supply line control pole tensions.
It is also preferable that when needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, load two one-way SCRs being responsible for forward conduction in ac power supply line and control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, load two one-way SCRs being responsible for reverse-conducting in ac power supply line and control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, cancel in ac power supply line four one-way SCRs and control pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and after two one-way SCRs control pole tensions of responsible reverse-conducting are cancelled, two one-way SCRs loaded in direct current supply line control pole tensions.
System output no-voltage saltus step when this preferred version is can ensure that switching equally.
Aforementioned system then develops into: a kind of alternating current-direct current without time delay switched system, including:
System output, with output AC or unidirectional current, including the first outfan and the second outfan；
Ac power supply line, for input AC electricity, it is made up of ac input end and two pairs of one-way SCRs, two mutually opposing parallel connections of one-way SCR in every pair of one-way SCR, the first input end of described ac input end and the second input connect one end of two pairs of one-way SCRs respectively, and the other end of two pairs of one-way SCRs distinguishes the first outfan and second outfan of welding system outfan；
Direct current supply line, for input dc power, it is made up of direct-flow input end and two one-way SCRs, the positive input of described direct-flow input end terminates the anode of the first one-way SCR, first outfan of the negative electrode welding system outfan of the first one-way SCR, negative input terminates the negative electrode of the second one-way SCR, the second outfan of the anode welding system outfan of the second one-way SCR；
Voltage detecting circuit, Sample AC input terminal voltage and direct-flow input end voltage, and export to controller；
Control switching circuit, including the signal input part being connected with the signal output interface of controller, control, with each bidirectional triode thyristor and each of one-way SCR, the break-make control end that pole is connected respectively, receive the voltage that controller signals loads or cancels corresponding SCR control pole；
Controller, judges the immediate status of ac input end voltage according to the live signal of voltage detecting circuit transmission；
Described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, output loads two one-way SCRs being responsible for forward conduction in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn before bearing, and the one-way SCR of responsible forward conduction controls after pole tension loads, output loads two one-way SCRs being responsible for reverse-conducting in ac power supply line and controls the instruction of pole tensions；
The reception exchange of described controller switches to the switching command of direct current, after ac input end voltage is become a full member, turns before bearing, and the instruction of four one-way SCR control pole tensions in ac power supply line is cancelled in output；Control after pole tension cancels at the one-way SCR of responsible reverse-conducting, ac input end voltage turn negative before, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
It is also preferable that described controller receives direct current switches to the switching command of exchange, output is cancelled two one-way SCRs in direct current supply line and is controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, output loads two one-way SCRs being responsible for forward conduction in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, output loads two one-way SCRs being responsible for reverse-conducting in ac power supply line and controls the instruction of pole tensions；
Described controller receives exchange and switches to the switching command of direct current, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, output is cancelled in ac power supply line four one-way SCRs and is controlled the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and the one-way SCR of responsible reverse-conducting controls after pole tension cancels, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
In the method and system of the present invention, the selection of described bidirectional triode thyristor and one-way SCR have to be larger than the load current of system power supply, its off-state peak value the is pressure crest voltage that have to be larger than system power supply.
Described voltage detecting circuit includes alternating voltage detection and DC voltage testing circuit.Described ac voltage detection circuit and DC voltage testing circuit common ground connection.For guaranteeing the real-time of voltage detecting, nor affecting on the safety of Alternating Current Power Supply and direct current supply, DC voltage detection needs isolation detection simultaneously.
Described control switching circuit includes for thyristor controlled insulating power supply and signal processing circuit, is wherein electrical isolation between signal processing circuit and alternating current power supply and DC source.Owing to silicon controlled negative electrode is connected with the negative pole controlling power supply, and the break-make of power of alterating and direct current controls to be the two poles of the earth break-makes simultaneously, so it must be isolation that the silicon controlled at the two poles of the earth controls power supply.Control power supply between the controllable silicon of alternating current-direct current input also must be relatively isolated simultaneously.Specifically, the control power supply of two bidirectional triode thyristors in alternating current circuit is electrically isolated from one another；SCR control power supply in alternating current circuit is electrically isolated from one another with the SCR control power supply in DC line simultaneously.
The method of the invention and system are particularly suited for the switching between AC100V ~ AC220V alternating current power supply and DC200V ~ DC290V DC source.
In the present invention, ac input end voltage refers to: receive the input voltage relative to another input of same system outfan in ac input end with direct current positive input terminal.Forward conduction refers to: electric current is from receiving the ac input end of same system outfan with direct current positive input terminal through being loaded to the conducting of another ac input end.Now, ac input end voltage is in positive half cycle.
Accompanying drawing explanation
Fig. 1 silicon controlled schematic diagram.
Fig. 2 is the electrical block diagram of one preferred version of system of the present invention.
Fig. 3 is the change in voltage schematic diagram that system shown in Figure 2 direct current switches to communication process.
Fig. 4 is the change in voltage schematic diagram that system shown in Figure 2 exchange switches to direct current process.
Detailed description of the invention
Below in conjunction with accompanying drawing, by way of example technical solution of the present invention is further elaborated.
For being better understood when the System Working Principle of the present invention, first in conjunction with the detailed description silicon controlled operation principle of accompanying drawing 1 and characteristic.Controllable silicon is the large power semiconductor device of a kind of four-layer structure with three PN junctions, is applied not only to rectification, it is also possible to quick-make or cut off circuit for noncontacting switch.Controllable silicon has characteristics that when (1) controls pole (G1) no-voltage, controllable silicon is two-way becomes off-state (resistance is very big)；(2), when control pole (G1) adds forward control voltage (trigger current is about 100mA), controllable silicon becomes on-state；(3) as long as electric current is more than trigger current during on-state, controllable silicon on-state can be maintained；(4) during on-state, controllable silicon has diode characteristic, namely reversely ends.Controllable silicon is divided into one-way SCR and bidirectional triode thyristor two kinds, is all three electrodes.One-way SCR has negative electrode (K), anode (A), controls pole (G).Bidirectional triode thyristor is equivalent to two individual event controllable silicon reverse parallel connections and forms.
In shown in accompanying drawing 2, substantially complete describe the due feature of system, for a preferred embodiment of the present invention.The present embodiment includes exchange inputs, direct current inputs, combined-voltage detects, switch for alternating current-direct current controllable silicon, control switching circuit and measurement control MCU.AC-input voltage detects the divider resistance R1 and divider resistance R2 that include being connected on two between ac input end, the voltage division signal of R2 is connected to the input of the ac voltage signal of voltage signal process part, pass through voltage follower circuit, the voltage signal of R2 is delivered to measurement MCU, converts the analogue signal of alternating voltage to digital signal.DC input voitage detection includes the divider resistance R3 and the divider resistance R4 that are connected between positive input terminal and negative input end, R4 voltage division signal is connected to the d. c. voltage signal input of voltage signal process part, by linear photoelectric isolation circuit, DC voltage analogue signal is delivered to measurement and controls MCU computing, calculate real-time DC voltage.Exchange switching controllable silicon includes the break-make that two bidirectional triode thyristor SR1 and SR2, controllable silicon SR1 control fire (L) line of exchange, and controllable silicon SR2 controls the break-make of zero (N) line of exchange.Direct current switching controllable silicon includes two unidirectional controllable silicon S R3 and SR4, the anode (A) of controllable silicon SR3 with direct current just the input of (P) pole be connected, the negative electrode (K) of SR3 with direct current just the outfan of (P) pole be connected, be used for controlling the break-make of direct current just (P) pole.The connection of controllable silicon SR4 is contrary with the method for attachment of controllable silicon SR3, and the moon (K) pole of SR4 is connected with the input of negative (N) pole of direct current, and sun (A) pole of SR4 is connected with the outfan of negative (N) pole of direct current, is used for controlling the break-make of negative (N) pole of direct current.Silicon controlled controls (G) pole and controls to go here and there between power supply have a current-limiting resistance, limits silicon controlled firing current.Two control (G) poles of bidirectional triode thyristor SR1 are connected with current-limiting resistance R5 and current-limiting resistance R6 respectively, current-limiting resistance R5 and R6 more respectively with insulating power supply DC1 and DC2 outfan just (+) pole is connected, the negative (-) pole of insulating power supply DC1 and DC2 outfan is connected with exchanging fire (L) line.Two control (G) poles of bidirectional triode thyristor SR2 are connected with current-limiting resistance R7 and current-limiting resistance R8 respectively, current-limiting resistance R7 and R8 again with the outfan of insulating power supply DC3 and DC4 just (+) be connected, the negative (-) pole of insulating power supply DC3 and DC4 outfan is connected with AC zero (N) line.The control (G) of unidirectional controllable silicon S R3 is connected with current-limiting resistance R9, through R9 again with insulating power supply DC5 outfan just (+) pole is connected, the negative (-) pole of insulating power supply DC5 outfan is connected with the moon (K) pole of SR3.Control (G) pole of single-phase silicon-controlled SR4 is connected with current-limiting resistance R10, through R10 again with insulating power supply DC6 outfan just (+) pole is connected, the negative (-) pole of insulating power supply DC6 outfan is connected with the moon (K) pole of SR4.Insulating power supply in embodiment and control signal process part include the electrical isolation device of multiple (6 or 4) insulating power supply and MCU control signal and insulating power supply.Due to exchange fire (L) line with direct current just (+) output of pole is short is connected, it is equivalent to by the power supply of insulating power supply DC2 and insulating power supply DC5 altogether, so insulating power supply DC2 and insulating power supply DC5 can use same insulating power supply, same AC zero (N) line is connected with the outfan of direct current negative (-) pole, it is equivalent to by insulating power supply DC4 and insulating power supply DC6 altogether, so same insulating power supply can be used, to reduce cost.The electrical isolation device of MCU control signal and insulating power supply can be selected for light-coupled isolation or relay isolation, adopts light-coupled isolation in embodiments of the invention.
System composition in the above embodiments of the invention and technical characteristic, be described in detail operation principle and the technical essential of system below in conjunction with accompanying drawing.
It it is the DC source process that switches to alternating current power supply shown in accompanying drawing 3.First system works in direct current supply, and single-phase silicon-controlled in DC power supply circuit is in on-state.Owing to certain needs to switch to Alternating Current Power Supply, system switches to the instruction of Alternating Current Power Supply receiving direct current supply, and the silicon controlled turning off DC source only need to be controlled (G) pole tension by system, opens SCR control (G) pole tension of alternating current power supply.But controllable silicon has a characteristic to be exactly when there being load current, even if turning off SCR control (G) pole tension, can not disjunction controllable silicon.But another characteristic is silicon controlled, and cloudy (K) pole tension is higher than sun (A) pole tension, can disjunction controllable silicon.The present invention utilizes controllable silicon the two characteristic to realize the static switching without time delay.
Can learn according to silicon controlled specificity analysis, control voltage DC5 and the DC6 of controllable silicon SR3 and SR4 in DC circuit loop is turned off during any instant t1 between time t0 ~ t2, open the forward of controllable silicon SR1 and SR2 in ac circuit simultaneously and control voltage DC2 and DC3, between time t2 ~ t4, any instant t3 opens Reverse Turning Control voltage DC1 and the DC4 of bidirectional triode thyristor SR1 and SR2 in ac circuit, so as to be the on-state of two-way admittance.Between time t0 ~ t4, alternating voltage is in the sinusoidal wave change positive half period stage, when at t2 moment ac voltage more than DC voltage value, really have turned off unidirectional controllable silicon S R3 in DC loop.Due in DC loop without electric current, it is impossible to maintain the on-state of the unidirectional controllable silicon S R4 of negative (-) pole in DC loop, become off-state.So far complete direct current supply and switch to the process of Alternating Current Power Supply.
It it is the alternating current power supply process that switches to DC source shown in accompanying drawing 4.First system works in Alternating Current Power Supply, and controllable silicon SR1 and SR2 is in on-state, and controllable silicon SR3 and SR4 is in off-state.The instruction switching to direct current supply is received in system, by analyzing silicon controlled characteristic, known any instant between time t1 ~ t3 turns off the control voltage DC1 ~ DC4 of controllable silicon SR1 and SR2 in ac circuit, opens control voltage DC5 and the DC6 of controllable silicon SR3 and SR4 in DC loop simultaneously.Owing to now alternating voltage is in sinusoidal variations positive half period, alternating voltage is more than DC voltage.Simultaneously turning off control voltage DC1 ~ DC4 in the t2 moment, the counter-portion of bidirectional triode thyristor is divided and is immediately become off-state, but forward part is still on-state, has operating current, for load supplying.Elapsing over time to the t3 moment, in ac circuit, the moon (K) pole tension of the forward part of bidirectional triode thyristor SR1 and SR2 is DC voltage, and higher than sun (A) pole tension, forward part is turned off.DC source provides electric power with being load, so far completes alternating current power supply and switches to the process of DC source.
Although native system technical scheme being described above in association with the embodiment of the present invention, but it should be appreciated by those skilled in the art, method and system of the present invention is not limited to the embodiment described in detailed description of the invention, when without departing substantially from the spirit and scope of the invention being defined by the appended claims, do not pay creative work and technical scheme is made various amendment, increase and replaces the scheme obtained.All should belong to the scope of protection of the invention.
Claims (10)
1. an alternating current-direct current is without delay switching method, it is characterised in that the method is connected respectively an one-way SCR in the positive and negative bus of direct current supply line, a bidirectional triode thyristor of connecting respectively in the both threads of ac power supply line；
When needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, two the bidirectional triode thyristor forward conductions loaded in ac power supply line control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, and control after pole tensions load, to load two bidirectional triode thyristor reverse-conductings control pole tensions at two bidirectional triode thyristor forward conductions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, turn before bearing, cancel two bidirectional triode thyristor forward conductions in ac power supply line and control pole tensions, reverse-conductings control pole tension；Control after pole tensions cancel at two bidirectional triode thyristor reverse-conductings, ac input end voltage turn negative before, two one-way SCRs loaded in direct current supply line control pole tensions.
2. according to claim 1 alternating current-direct current without delay switching method, it is characterised in that when needs are switched to Alternating Current Power Supply by direct current supply, first cancel two one-way SCRs in direct current supply line and control pole tensions；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, two the bidirectional triode thyristor forward conductions loaded in ac power supply line control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, loads two bidirectional triode thyristor reverse-conductings control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, cancel bidirectional triode thyristor forward conduction control pole tension, reverse-conducting control pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and after bidirectional triode thyristor reverse-conducting control pole tension is cancelled, two one-way SCRs loaded in direct current supply line control pole tensions.
3. an alternating current-direct current is without delay switching method, it is characterised in that the method is connected respectively an one-way SCR in the positive and negative bus of direct current supply line, a pair mutually opposing one-way SCR in parallel of connecting respectively in the both threads of ac power supply line；
When needs are switched to Alternating Current Power Supply by direct current supply, two one-way SCRs first cancelled in direct current supply line control pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, load two one-way SCRs being responsible for forward conduction in ac power supply line and control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn before bearing, and after two one-way SCRs of responsible forward conduction control pole tension loading, load two one-way SCRs being responsible for reverse-conducting in ac power supply line and control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, turn before bearing, cancel four one-way SCRs in ac power supply line and control pole tension；Control after pole tensions cancel at two one-way SCRs of responsible reverse-conducting, ac input end voltage turn negative before, two one-way SCRs loaded in direct current supply line control pole tensions.
4. according to claim 3 alternating current-direct current without delay switching method, it is characterised in that when needs are switched to Alternating Current Power Supply by direct current supply, first cancel two one-way SCRs in direct current supply line and control pole tensions；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, load two one-way SCRs being responsible for forward conduction in ac power supply line and control pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, load two one-way SCRs being responsible for reverse-conducting in ac power supply line and control pole tensions；
When needs are switched to direct current supply by Alternating Current Power Supply, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, cancel in ac power supply line four one-way SCRs and control pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and after two one-way SCRs control pole tensions of responsible reverse-conducting are cancelled, two one-way SCRs loaded in direct current supply line control pole tensions.
5. an alternating current-direct current is without time delay switched system, it is characterised in that including:
System output, for output AC or unidirectional current, including the first outfan and the second outfan；
Ac power supply line, for input AC electricity, it is made up of ac input end and two bidirectional triode thyristors, the first input end of described ac input end and the second input connect one end of two bidirectional triode thyristors respectively, and the other end of two bidirectional triode thyristors distinguishes the first outfan and second outfan of welding system outfan；
Direct current supply line, for input dc power, it is made up of direct-flow input end and two one-way SCRs, the positive input of described direct-flow input end terminates the anode of the first one-way SCR, first outfan of the negative electrode welding system outfan of the first one-way SCR, negative input terminates the negative electrode of the second one-way SCR, the second outfan of the anode welding system outfan of the second one-way SCR；
Voltage detecting circuit, Sample AC input terminal voltage and direct-flow input end voltage, and export to controller；
Control switching circuit, including the signal input part being connected with the signal output interface of controller, control, with each bidirectional triode thyristor and each of one-way SCR, the break-make control end that pole is connected respectively, control switching circuit is used for receiving controller signals, and loads or cancel the voltage of corresponding SCR control pole；
Controller, judges the immediate status of ac input end voltage according to the live signal of voltage detecting circuit transmission；
Described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, output loads two bidirectional triode thyristor forward conductions in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, and bidirectional triode thyristor forward conduction controls after pole tension loads, and output loads two bidirectional triode thyristor reverse-conductings in ac power supply line and controls the instruction of pole tensions；
Described controller receives and exchanges the switching command switching to direct current, after ac input end voltage is become a full member, turns before bearing, and output is cancelled two bidirectional triode thyristor forward conductions in ac power supply line and controlled pole tension and the instruction of reverse-conducting control pole tension；Control after pole tension cancels at bidirectional triode thyristor reverse-conducting, ac input end voltage turn negative before, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
6. alternating current-direct current according to claim 5 is without time delay switched system, it is characterised in that described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, output loads two bidirectional triode thyristor forward conductions in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, output loads two bidirectional triode thyristor reverse-conductings in ac power supply line and controls the instruction of pole tensions；
Described controller receives exchange and switches to the switching command of direct current, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, output is cancelled bidirectional triode thyristor forward conduction in ac power supply line and is controlled pole tension and reverse-conducting controls the instruction of pole tension；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and bidirectional triode thyristor reverse-conducting controls after pole tension cancels, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
7. the alternating current-direct current according to claim 5 or 6 is without time delay switched system, it is characterised in that this system is for the switching between AC100V ~ AC220V alternating current power supply and DC200V ~ DC290V DC source.
8. the alternating current-direct current according to claim 5 or 6 is without time delay switched system, it is characterised in that in combined-voltage detects, and DC voltage detection detects for electrical isolation；Control switching circuit includes for thyristor controlled insulating power supply and signal processing circuit, is wherein electrical isolation between signal processing circuit and alternating current power supply and DC source；The control power supply of two bidirectional triode thyristors in alternating current circuit is electrically isolated from one another；SCR control power supply in alternating current circuit is electrically isolated from one another with the SCR control power supply in DC line simultaneously.
9. an alternating current-direct current is without time delay switched system, it is characterised in that including:
System output, for output AC or unidirectional current, including the first outfan and the second outfan；
Ac power supply line, for input AC electricity, it is made up of ac input end and two pairs of one-way SCRs, two mutually opposing parallel connections of one-way SCR in every pair of one-way SCR, the first input end of described ac input end and the second input connect one end of two pairs of one-way SCRs respectively, and the other end of two pairs of one-way SCRs distinguishes the first outfan and second outfan of welding system outfan；
Direct current supply line, for input dc power, it is made up of direct-flow input end and two one-way SCRs, the positive input of described direct-flow input end terminates the anode of the first one-way SCR, first outfan of the negative electrode welding system outfan of the first one-way SCR, negative input terminates the negative electrode of the second one-way SCR, the second outfan of the anode welding system outfan of the second one-way SCR；
Voltage detecting circuit, Sample AC input terminal voltage and direct-flow input end voltage, and export to controller；
Control switching circuit, including the signal input part being connected with the signal output interface of controller, control, with each bidirectional triode thyristor and each of one-way SCR, the break-make control end that pole is connected respectively, control switching circuit is used for receiving controller signals, and loads or cancel the voltage of corresponding SCR control pole；
Controller, judges the immediate status of ac input end voltage according to the live signal of voltage detecting circuit transmission；
Described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, drop to equal with direct-flow input end voltage before, output loads two one-way SCRs being responsible for forward conduction in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn before bearing, and the one-way SCR of responsible forward conduction controls after pole tension loads, output loads two one-way SCRs being responsible for reverse-conducting in ac power supply line and controls the instruction of pole tensions；
The reception exchange of described controller switches to the switching command of direct current, after ac input end voltage is become a full member, turns before bearing, and the instruction of four one-way SCR control pole tensions in ac power supply line is cancelled in output；Control after pole tension cancels at the one-way SCR of responsible reverse-conducting, ac input end voltage turn negative before, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
10. alternating current-direct current according to claim 9 is without time delay switched system, it is characterised in that described controller receives direct current and switches to the switching command of exchange, and output is cancelled two one-way SCRs in direct current supply line and controlled the instruction of pole tension；Then after ac input end voltage rises and becomes a full member, rise to equal with direct-flow input end voltage before, output loads two one-way SCRs being responsible for forward conduction in ac power supply line and controls the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, turn negative before, output loads two one-way SCRs being responsible for reverse-conducting in ac power supply line and controls the instruction of pole tensions；
Described controller receives exchange and switches to the switching command of direct current, after ac input end voltage is become a full member, drop to equal with direct-flow input end voltage before, output is cancelled in ac power supply line four one-way SCRs and is controlled the instruction of pole tensions；Ac input end voltage rise to equal with direct-flow input end voltage after, drop to equal with direct-flow input end voltage before, and the one-way SCR of responsible reverse-conducting controls after pole tension cancels, output loads two one-way SCRs in direct current supply line and controls the instruction of pole tensions.
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| CN109570682B (en) * | 2018-12-27 | 2023-05-23 | 中正智控（江苏）智能科技有限公司 | Welding method of alternating current-direct current welding device adopting multi-strand wires |
| CN110690757B (en) * | 2019-09-09 | 2023-04-28 | 上海科梁信息科技股份有限公司 | Data monitoring device of electric power transmission and distribution system |
| CN114123359B (en) * | 2020-08-26 | 2023-12-12 | 深圳航羿知识产权服务有限公司 | Rack-mounted power supply system |
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| CN201742149U (en) * | 2009-11-20 | 2011-02-09 | 上海济烨能源科技有限公司 | Uninterrupted alternating current supply system based on high-speed silicon controlled |
| CN102710007A (en) * | 2012-05-18 | 2012-10-03 | 深圳市健网科技有限公司 | Double-power-supply system based on balance bridge arm |
| CN202817890U (en) * | 2012-09-20 | 2013-03-20 | 合肥联信电源有限公司 | Alternating-current double-power supply static electronic switching device |
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| CN102710007A (en) * | 2012-05-18 | 2012-10-03 | 深圳市健网科技有限公司 | Double-power-supply system based on balance bridge arm |
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