CN101599703A - Three phase mains is converted to the method and the AC power supply of single-phase voltage output - Google Patents
Three phase mains is converted to the method and the AC power supply of single-phase voltage output Download PDFInfo
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- CN101599703A CN101599703A CNA2008100675726A CN200810067572A CN101599703A CN 101599703 A CN101599703 A CN 101599703A CN A2008100675726 A CNA2008100675726 A CN A2008100675726A CN 200810067572 A CN200810067572 A CN 200810067572A CN 101599703 A CN101599703 A CN 101599703A
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Abstract
The present invention is applicable to power technique fields, provides a kind of three phase mains to be converted to the method and the AC power supply of single-phase voltage output, and described method comprises the following steps: that (a) provides a neutral input end and three voltage input ends; (b) wiring with described three phase mains is connected to described neutral input end and described three voltage input ends; (c) selected two voltage input ends in described three voltage input ends; (d) voltage quasi position of the described neutral input end of detection and two chosen voltage input ends is that △ connects or Y connects to judge described three phase mains; And, (e) if judge that described three phase mains is that Y connects, select a described neutral input end and a chosen voltage input end to produce a single-phase voltage signal,, select two chosen voltage input ends to produce a single-phase voltage signal if judge that this three phase mains is that △ connects.Technical scheme provided by the invention can judge that the three phase mains that is connected is that △ connects or Y connects, and whether the three phase mains wiring that is connected is correct.
Description
Technical field
The present invention relates to method and AC power supply that a kind of three phase mains is converted to single-phase voltage signal output, especially a kind of have that can to detect the three phase mains that is connected be that Δ connects or Y connects AC power supply.
Background technology
Three phase mains is a Blast Furnace Top Gas Recovery Turbine Unit (TRT) that three windings are arranged, the three-phase alternating current output that amplitude equates in order to produce, frequency equates, phase place differs from 120 degree mutually.According to the difference of three winding connections, three phase mains can divide into that Δ connects (or claiming triangular form connection) or Y connects (or claiming wye connection).Wherein, the line voltage that the three phase mains that Y connects is exported is about 1.7 times of phase voltage, and line current equals phase current.The line voltage that the three phase mains that Δ connects is exported equals phase voltage, and line current is about 1.7 times of phase current.To connect the voltage range of output signal different with Y because Δ connects, and a machine is if want the simultaneous adaptation Δ to connect the three phase mains that connects with Y, and the voltage range of its required load can be than only needing single kind of three phase mains of adaptation be greater.
The voltage range of the three-phase alternating current output that three phase mains produced is greater than the voltage range of single-phase output.Too high voltage output is unfavorable for the processing of follow-up other power stage.Therefore, after the three-phase alternating current output that three phase mains produces normally is converted to three single-phase outputs by an AC power supply, provide follow-up use again.
But, to connect three phase mains different except the voltage range of output with Y because Δ connects, and Δ connects that to connect the wiring of three phase mains also inequality with Y.Therefore, with the voltage transitions of three phase mains input is in the process of three single-phase outputs, must be able to judge that the three phase mains that is connected is that Δ connects or Y connects, and whether the wiring of correct identification three phase mains is correct, could be converted to three single-phase outputs by correct input voltage three phase mains.
Furthermore, Δ connects three phase mains three phase voltage wiring and an earth connection usually.Y connects three phase mains except three phase voltage wiring and an earth connection, also has a neutral line usually, connects the load that three phase mains has balance to guarantee Y.But also some Y connects three phase mains and can omit earth connection.Therefore, Δ connects and connects three phase mains with Y and can't directly be judged with wiring quantity usually.In addition, because Y connects three phase mains except three phase voltage wiring, also have a neutral line to connect the load that three phase mains has balance to guarantee Y.Whether correct present most of product all can't be differentiated wiring or product itself automatically and must distinguish to the fixing mode of connection (be non-Δ connect be exactly that Y connects) or must reach by revising the internal circuit mode.If the neutral line is mistaken as the phase voltage wiring and connects, or neutrality is mistakened as earth connection connects, often must wait until that three single-phase outputs begin drive electronics and anomaly takes place, and just can find this mistake.This moment, electronic installation may be impaired.
Therefore, how to connect appropriate back before three single-phase outputs produce at three-phase input power supply, just recognize automatically earlier that the three phase mains that is connected is that Δ connects or Y connects, and whether the wiring of the three phase mains that is connected is correct, whether the voltage that will export is at zone of reasonableness, and stop the damage that causes because of other factors, to those skilled in the art, be a problem demanding prompt solution.
Summary of the invention
The object of the present invention is to provide a kind of three phase mains to be converted to the method and the AC power supply of single-phase voltage output, be intended to solve and detect that three phase mains is that Δ connects or Y connects and problem that the wiring of three phase mains is whether correct.
The present invention is achieved in that a kind of AC power supply, connects three phase mains, and in order to produce at least one single-phase voltage signal output, described AC power supply comprises:
One neutral input end is connected with described three phase mains one neutral line;
Three voltage input ends are connected with three phase voltage output lines of described three phase mains;
Wherein, described AC power supply also comprises:
At least one Δ/Y commutation circuit, described Δ/Y commutation circuit is connected with described neutral input end and two voltage input ends, be used in the input signal of described neutral input end and described two voltage input ends, select binary signal to be used for producing described single-phase voltage signal, described Δ/Y commutation circuit comprises:
One Δ/Y judging unit, be used for detecting described in the pressure reduction of Introduced cases end and described two voltage input ends, be that Δ connects or Y connects to judge this three phase mains;
One switches assembly, is used for testing result according to described Δ/Y judging unit, selects whether to export the binary signal of the input signal that comprises described neutral input end;
The accurate position of one input voltage judging unit is used for detecting the pressure reduction of the binary signal that described changeover module selects, and judges whether described pressure reduction falls within the predeterminated voltage scope; And
One step switch unit is connected to the rear end of described changeover module, is used for controlling described Δ/Y commutation circuit and whether exports described single-phase voltage signal to the rear end circuit; And
One start unit is used for judged result according to the accurate position of the input voltage of described Δ/Y commutation circuit judging unit, and whether control exports described single-phase voltage signal.
Described AC power supply also comprises a driving control unit, is used for judged result according to the accurate position of described input voltage judging unit, and whether whether the conducting of controlling described step switch unit export described single-phase voltage signal with decision.
Described Δ/Y commutation circuit also comprises a power stage, and described power stage is set by described driving control unit by the user, is used for exporting the binary signal that described changeover module is selected.
Described power stage comprises an ac/ac power converter.
It is that Y selects when connecing output to comprise the binary signal of the input signal of described neutral input end that described changeover module is used at described Δ/described three phase mains of Y judgment unit judges.
It is the input signal that Δ is selected two described voltage input ends of output when connecing that described changeover module is used at described Δ/described three phase mains of Y judgment unit judges.
The accurate position of described input voltage judging unit is used for when the pressure reduction of the binary signal that detects described changeover module selection is zero, and the neutral line that produces the described three phase mains of a wiring error signal indication is not connected to described neutral input end.
Described AC power supply also comprises a three-phase voltage sequence switch, on the circuit between being connected between described input voltage accurate position judging unit and described changeover module, be used for controlling the binary signal of whether described changeover module being selected and input to the accurate position of described input voltage judging unit.
The accurate position of described input voltage judging unit is used for exporting a three-phase voltage sequence switch by another Δ of signal enabling/Y commutation circuit when the pressure reduction of the binary signal that detects described changeover module selection falls within the described predeterminated voltage scope.
The accurate position of described input voltage judging unit is used for producing the signal of a voltage mistake when the pressure reduction of the binary signal that detects described changeover module selection does not fall within the described predeterminated voltage scope.
Described Δ/Y commutation circuit is three, is used for producing three described single-phase voltage signals, and described three Δs/Y commutation circuit is connected to two different voltage input ends respectively.
Institute's three Δ/Y commutation circuits of speed comprise first Δ/Y commutation circuit, second Δ/Y commutation circuit and the 3rd Δ/Y commutation circuit, are used for respectively judging in regular turn whether corresponding single-phase voltage voltage of signals scope falls within the described predeterminated voltage scope.
Also comprise a start-up circuit in limited time, be connected to described three-phase voltage sequence switch, be used at the described three-phase voltage sequence switch of a Preset Time conducting.
The present invention also provides a kind of three phase mains is converted to the method that the single-phase voltage signal is exported, and described method comprises the following steps:
(a) provide a neutral input end and three voltage input ends;
(b) wiring with described three phase mains is connected to described neutral input end and described three voltage input ends;
(c) selected two voltage input ends in described three voltage input ends;
(d) voltage quasi position of the described neutral input end of detection and two chosen voltage input ends is that Δ connects or Y connects to judge described three phase mains; And
(e) if judge that described three phase mains is that Y connects, select a described neutral input end and a chosen voltage input end to produce a single-phase voltage signal, if judge that this three phase mains is that Δ connects, select two chosen voltage input ends to produce a single-phase voltage signal.
Wherein, step (c) to (e) is triplicate altogether, and selected respectively two incomplete same voltage input ends are to produce three different single-phase voltage signals.
Also comprise and detect described single-phase voltage voltage of signals scope whether greater than a predeterminated voltage scope, if produce an input voltage and cross large-signal.
If judge that described three phase mains is that Y connects, comprise also whether the pressure reduction that detects described neutral input end and described voltage input end is zero, if produce a wiring error signal.
The present invention overcomes the deficiencies in the prior art, and the AC power supply that provides has Δ/Y commutation circuit, and whether the wiring that can detect the three phase mains that is connected and be the three phase mains that Δ connects or Y connects and connected is correct; In addition, the voltage quasi position judging unit that possesses of AC power supply provided by the invention also helps to prevent the single-phase voltage abnormal signal and damages the electronic installation that is driven.Therefore, whether AC power supply provided by the invention can remind the wiring of the three phase mains that the user connects correct, no matter to be Δ connect this three phase mains or Y connects, each single-phase voltage signal all confirm errorless before, can't export the single-phase voltage signal, can avoid electronic installation impaired because bearing unusual driving voltage.
Description of drawings
Fig. 1 is the theory diagram of the AC power supply that provides of the embodiment of the invention;
Fig. 2 is the theory diagram of Δ among Fig. 1/Y commutation circuit 120a;
Fig. 3 is the time sequences figure of the AC power supply 100 of Fig. 1;
Fig. 4 is an embodiment of the invention flow chart.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 is the theory diagram of AC power supply 100 1 preferred embodiments of the present invention.This AC power supply 100 is connected to a three phase mains (not shown) and outwards exports to produce at least one single-phase voltage signal.As shown in FIG., AC power supply 100 comprises a neutrality (Neutral) input N, three voltage input end L1, L2 and L3, at least one Δ/Y commutation circuit 120a, 120b and a 120c and a start unit 140.Wherein, neutral input end N is connected to the neutral line (neutral line) of three phase mains.Three voltage input end L1, L2 and L3 are connected to three phase voltage output lines of three phase mains respectively.Whether neutral input end N, three voltage input end L1, L2 and L3 and Δ/Y commutation circuit 120 constitutes a testing circuit, connect correct in order to the wiring that detects three phase mains.
Present embodiment is that example describes with three Δs/Y commutation circuit 120a, 120b and 120c.These three Δs/ Y commutation circuit 120a, 120b and 120c are connected different two voltage input end L1, L2 and L3 and the neutral line (Neutral) input N respectively, outwards export to produce three single-phase voltage signal Vo1, Vo2 and Vo3.With Δ/Y commutation circuit 120a of being positioned at the top is example, this Δ/Y commutation circuit 120a is connected to neutral input end N and two voltage input end L1 and L2, and in the input signal of the input signal of neutral input end N and two voltage input end L1 and L2, select two signals to produce single-phase voltage signal Vo1.
Fig. 2 is the theory diagram of Δ among Fig. 1/Y commutation circuit 120a.As shown in FIG., Δ/Y commutation circuit 120a has one Δ/Y judging unit 122, a switching assembly 124, a three-phase voltage sequence switch 125, the accurate position of input voltage judging unit 126, a driver element 127 and a step switch assembly 130.
Δ/Y judging unit 122 is used for detecting the pressure reduction of neutral input end N and two voltage input end L1, L2, to judge that the three phase mains that is connected is that Δ connects or Y connects.Generally speaking, Δ connects the three phase mains that connects with Y, and its output signal approximately differs 1.7 times.In the embodiment of the invention, can preestablish pressure reduction and fall within a Δ to connect in the voltage range (for example: 190～250 volts) be exactly that Δ connects, falling within a Y, to connect in the voltage range (for example: 330～430 volts) be exactly that Y connects.Therefore, which voltage range Δ/Y judging unit 122 can fall within by detecting pressure reduction, judges that the three phase mains that is connected is that Δ connects or Y connects.
The accurate position of input voltage judging unit 126 is used for detecting changeover module 124 and selects the pressure reduction of two signal S1, S2 of output, and judges whether this pressure reduction falls within the predeterminated voltage scope.Because the pressure reduction of signal S1, S2 is corresponding to single-phase voltage signal Vo1, therefore, the accurate position of input voltage judging unit 126 can avoid the single-phase voltage signal Vo1 of output abnormality to cause the electronic installation (not icon) that driven impaired.Furthermore, surpass the predeterminated voltage scope if detect pressure reduction, the accurate position of input voltage decision circuitry 126 can also produce the excessive signal CE of an input voltage and notify the user.If pressure reduction falls within the predeterminated voltage scope, 126 of the decision circuitry in the accurate position of input voltage can produce one by signal EN.It should be noted that at the accurate position of input voltage judging unit 126 and judge that AC power supply 100 is not outwards exported single-phase voltage signal Vo1, Vo2 and Vo3 in the process of pressure reduction.Therefore, the device that can avoid the rear end to connect is impaired.
Generally speaking, the modal wiring error of three phase mains is as follows, exactly the neutral line (neutral line) being takeed for is phase voltage output line and be connected to voltage input end L1, L2, L3, or the three phase mains that Y connects takeed for the three phase mains that Δ connects, be earth connection and the neutral line is takeed for.AC power supply 100 of the present invention can judge also except judging that the three phase mains that is connected is that Y connects or Δ connects whether the neutral line of three phase mains correctly is connected to neutral input end N.
In addition, the accurate position of input voltage judging unit 126 judges whether detected pressure reduction falls within the predeterminated voltage scope, helps also to check whether wiring is correct.Furthermore, judge that at Δ/Y judging unit 122 three phase mains are under the Y situation about connecing (three phase mains that Y connects just has the neutral line), if the accurate position of input voltage judging unit 126 detected pressure reduction drop in the predeterminated voltage scope, this just represents that input wires is correct.In the case, the accurate position of input voltage judging unit 126 is produced pass through signal, and the while represents that also the neutral line wiring of three phase mains is correct.If the accurate position of input voltage judging unit 126 detected pressure reduction surpass the predeterminated voltage scope, this just represents that input wires is wrong.At this moment, the accurate position of input voltage judging unit 126 can produce the signal NE of a wiring error or the wiring error that the excessive signal CE of input voltage reminds user's three phase mains in addition.
Secondly, in order to adjust the single-phase voltage signal Vo1 that AC power supply 100 exported, the magnitude of voltage of Vo2, Vo3, and guarantee the voltage stability of output signal.In the embodiment of the invention, as shown in Figure 2, can in Δ/Y commutation circuit 120a, a power stage 128 be set.The user can do different settings by 127 pairs of power stages 128 of driving control unit according to its demand, to change the single-phase voltage signal of output.Changeover module 124 selected two signal S1, S2 outwards export via power stage 128.This power stage 128 can be an AC-DC Circuit, can comprise full bridge rectifier, SCR control (silicon controlrectifier, controllable silicon) or active power factor correction circuit etc., decides according to the demand of the single-phase voltage signal of institute's desire output.This power stage 128 also can be useed a switch as, and whether Vo1 exports with control single-phase voltage signal.Furthermore, after the accurate position of the input voltage in each Δ/ Y commutation circuit 120a, 120b and 120c judging unit 126 is all exported by signal CP1, CP2 and CP3, driving control unit 127 just can be exported enabling signal and start each Δ/Y commutation circuit 120a, 120b and the interior power stage 128 of 120c, and single-phase voltage signal Vo1, Vo2 and Vo3 are outwards exported.
It should be noted that, as shown in Figure 1, in the AC power supply 100 that the embodiment of the invention provides, the accurate position of the input voltage in three Δ/Y commutation circuit 120a, 120b and the 120c (hereinafter referred to as first Δ/Y commutation circuit 120a, second Δ/Y commutation circuit 120b and the 3rd Δ/Y commutation circuit 120c) decision circuitry 126 is not to detect the selected signal of changeover module 124 simultaneously.Please refer to Fig. 2 simultaneously, each Δ/ Y commutation circuit 120a, 120b, 120c have a three-phase voltage sequence switch 125 respectively, be arranged on the circuit of 124 of input voltage accurate position judging unit 126 and changeover modules, the binary signal of whether changeover module 124 being selected with decision inputs to the accurate position of input voltage judging unit 126.See through the sequential of each three-phase voltage sequence switch 125 conductings of control, whether the signal that AC power supply 100 of the present invention can detect three Δ/Y commutation circuit 120a of input, 120b, 120c in regular turn meets the requirements.
Furthermore, the three-phase voltage sequence switch 125 in second Δ/Y commutation circuit 120b is to be started by the signal CP1 that passes through that the accurate position of the input voltage in first Δ/Y commutation circuit 120a judging unit 126 is exported.Therefore, the accurate decision circuitry 126 of the input voltage in the second Δ/Y commutation circuit 120b accurate position of the input voltage decision circuitry 126 of first Δ/Y commutation circuit 120a is by the time exported by behind the signal CP1, just can begin to detect.Three-phase voltage sequence switch 125 in the 3rd Δ/Y commutation circuit 120c is to be started by the signal CP2 that passes through that the accurate position of the input voltage in second Δ/Y commutation circuit 120b judging unit 126 is exported, the accurate decision circuitry 126 of input voltage in the 3rd Δ/Y commutation circuit 120c accurate position of the input voltage decision circuitry 126 of second Δ/Y commutation circuit 120b is by the time exported by behind the signal CP2, just can begin to detect.But, 125 of the three-phase voltage sequence switches of first Δ/Y commutation circuit 120a are to be started by an outside signal CP0 who imports.In addition, decision circuitry 126 outputs of the accurate position of the input voltage in the 3rd Δ/Y commutation circuit 120c are by behind the signal CP3, and start unit 140 just can produce enabling signal ES.That is to say AC power supply 100 of the present invention is whether the result who judges the accurate position of each phase input voltage judging unit 126 in regular turn all falls within the default voltage range, whether decision exports single-phase voltage signal Vo1, Vo2 and Vo3 again.This is listed as the device that inspection can more effective protection rear end connects in regular turn, especially needs the three-phase voltage device driven.
As previously mentioned, external signal CP0, by signal CP1, CP2 and three-phase voltage sequence switch 125, with so that changeover module 124 selected signals are fed the accurate position of corresponding input voltage judging unit 126, whether whether wrong above the wiring of predeterminated voltage scope and three phase mains to detect the single-phase voltage signal.In testing process, the three-phase voltage sequence switch 125 of each Δ/ Y commutation circuit 120a, 120b, 120c is alternately to start.But, after detection was passed through, 125 of the three-phase voltage sequence switches of each Δ/ Y commutation circuit 120a, 120b, 120c were the states of keeping constant startup.
For the start-up time of the three-phase voltage sequence switch 125 of controlling each Δ/ Y commutation circuit 120a, 120b and 120c, to adjust the detection sequential of the accurate position of the input voltage judging unit in each Δ/Y commutation circuit.As shown in Figure 1, each Δ/ Y commutation circuit 120a, 120b, 120c are respectively to there being in limited time start-up circuit 160a, 160b, a 160c.This prescribe a time limit start- up circuit 160a, 160b, 160c produce one and have the corresponding Δ of enabling signal SS1, SS2, the SS3 conducting/Y commutation circuit 120a of Preset Time length, the three-phase voltage sequence switch 125 of 120b, 120c behind the signal CP0 that passes through signal CP1, CP2 and outside input that receives from previous Δ/Y commutation circuit 120a, 120b.
Fig. 3 is the time sequences figure of the AC power supply 100 of Fig. 1.The signal that is presented among the figure comprises in order to the enabling signal SS1 that opens each three-phase voltage sequence switch 125, SS2, SS3 and in order to open the enabling signal ES of each power stage 128.Please refer to Fig. 1 simultaneously, after start-up circuit 160a received external signal CP0 in limited time, in time point t1, start-up circuit 160a promptly can produce an enabling signal SS1 to open the three-phase voltage sequence switch 125 of Δ/Y commutation circuit 120a in limited time.This enabling signal SS1 lasts till that time point t2 will end.
After first Δ/Y commutation circuit 120a judges that the errorless and single-phase voltage signal of wiring falls within default voltage range in, promptly can produce one and pass through signal CP1.Start-up circuit 160b receives this by behind the signal CP1 in limited time, and in time point t3, start-up circuit 160b promptly can produce an enabling signal SS2 to open the three-phase voltage sequence switch 125 of second Δ/Y commutation circuit 120b in limited time.This enabling signal SS2 lasts till that time point t4 will end.
After second Δ/Y commutation circuit 120b judges that the errorless and single-phase voltage signal of wiring falls within default voltage range in, promptly can produce one and pass through signal CP2.Start-up circuit 160c receives this by behind the signal CP2 in limited time, and in time point t5, start-up circuit 160c promptly can produce an enabling signal SS3 to open the three-phase voltage sequence switch 125 of the 3rd Δ/Y commutation circuit 120c in limited time.This enabling signal SS3 lasts till that time point t6 will end.
After the 3rd Δ/Y commutation circuit 120c judges that the errorless and single-phase voltage signal of wiring falls within default voltage range in, promptly can produce one and pass through signal CP3.Start unit 140 receives this by behind the signal CP3, promptly can produce an enabling signal ES in time point t8, notifies driving control unit 127 turn-on action switch module 130 and the driving power levels 128 of each Δ/ Y commutation circuit 120a, 120b, 120c.
In addition, in order to continue the input signal of monitoring three phase mains, therefore AC power supply 100 of the present invention is after each Δ/ Y commutation circuit 120a, 120b, 120c finish judgement in regular turn, and each prescribe a time limit start unit 160a, 160b, 160c can export enabling signal SS1, SS2 once more at time point t7, SS3 starts three Δ/Y commutation circuit 120a, 120b, 120c.Enabling signal SS1, SS2, the SS3 of current output is the detection of being carried out at single-phase voltage signal output back, can last till usually after AC power supply 100 is shut down just can end.
Fig. 4 is an embodiment of the invention flow chart.Please refer to shown in Figure 1ly simultaneously, at first,, provide a neutral input end N and three voltage input end L1, L2, L3, and the wiring of three phase mains is connected to neutral input end N and three voltage input end L1, L2, L3 respectively in step S100.Then, in step S120, selected two voltage input ends, for example voltage input end L1, L2 in three voltage input end L1, L2, L3.Next, in step S140, detecting neutral input end N and two chosen voltage input end L1, the voltage quasi position of L2, is that Δ connects or Y connects to judge this three phase mains.Then, in step S150, be that Y connects if judge three phase mains, just select neutral input end N and a chosen voltage input end, voltage input end L1 for example is with generation single-phase voltage signal; If judge that three phase mains is that Δ connects,, just select two chosen voltage input end L1, L2 to produce the single-phase voltage signal in step S170.
After step S170, whether step S180 detects single-phase voltage voltage of signals scope greater than a predeterminated voltage scope.If greater than the predeterminated voltage scope, in step S185, produce the excessive signal of an input voltage, and end subsequent step.If not, shown in step S195, then export this single-phase voltage signal Vo1.Abovementioned steps can prevent to export excessive single-phase voltage signal and the electronic installation that causes being driven is impaired.
If not only one of the single-phase voltage signal that institute's desire detects can increase by a step S190 between step S180 and step S195, check whether also have other single-phase voltage signal not detect as yet.If also have other single-phase voltage signal not detect as yet, then get back to step 120 and repeat aforementioned flow process.If all single-phase voltage signals are all detected, then enter step S195, export this single-phase voltage signal Vo1.
Whether can have unusually to detect other signals in the back adding one step S196 of step S195 in the practical application, the output voltage that for example detect abnormal signal that over-temperature protection produces, causes because of power stage unusually is unusual etc.If unusual generation is arranged, shown in step S197, then can after single-phase voltage output, carry out extra measure protection back end electronics, for example stop to produce enabling signal to end output single-phase voltage signal.If there is not other unusual generation,, then continue output single-phase voltage signal Vo1 as step S198.
Whether in the present embodiment, carry out step S196 again behind step S195 output single-phase voltage signal has to detect other signals unusually.But, the present invention is not limited to this, and step S196 also can also can carry out with step S195 before step S195 synchronously.
In addition, be that Y connects if step S140 judges this three phase mains, and select neutral input end N and a voltage input end L1 to produce the single-phase voltage signal in step S150.Can increase by a step S160 behind step S150, whether the pressure reduction that detects neutral input end N and voltage input end L1 is roughly zero.If as step S165, produce the signal NE of a neutral line wiring error, and end subsequent step.If not, then proceed subsequent step.
It should be noted that the present invention provides a neutral input end N and three voltage input end L1, L2, L3 in step S100, but, only selects two voltage input end L1, L2 to carry out subsequent step to produce single-phase voltage signal Vo1 in step S120.In order to produce other single-phase voltage signal Vo2, Vo3, must get back to step 120 and repeat this flow process secondary, just step S120 to S195 carries out altogether three times.And, get back to step 120 each time and must select incomplete same two voltage input ends (L1 and L2, L2 and L3, L3 and L1).
Traditional AC power supply can not judge directly that the three phase mains that is connected is that Δ connects or Y connects and whether the wiring of the three phase mains that connected is correct.Therefore, after three single-phase voltage signal drive electronics of AC power supply output by the time, whether judge normally by the reaction of rear end load electronic installation whether the wiring of three phase mains is correct usually.But, during this time, electronic installation may bear unusual driving voltage and suffer damage.
As depicted in figs. 1 and 2, AC power supply 100 of the present invention has Δ/ Y commutation circuit 120a, 120b, 120c can to detect the three phase mains that is connected is that Δ connects or Y connects and whether the wiring of the three phase mains that connected is correct.In addition, voltage quasi position judging unit 126 also helps to prevent the single-phase voltage abnormal signal and damages the electronic installation that is driven.Therefore, whether AC power supply 100 of the present invention can remind the wiring of the three phase mains that the user connects correct, and no matter to be Δ connect this three phase mains or Y connects.The more important thing is, AC power supply 100 of the present invention each single-phase voltage signal all confirm errorless before, can't export the single-phase voltage signal.Therefore, can avoid electronic installation impaired because bearing unusual driving voltage.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all interior any modifications of doing in the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included in protection scope of the present invention in.
Claims (17)
1, a kind of AC power supply connects three phase mains, and in order to produce at least one single-phase voltage signal output, described AC power supply comprises:
One neutral input end is connected with described three phase mains one neutral line;
Three voltage input ends are connected with three phase voltage output lines of described three phase mains;
It is characterized in that described AC power supply also comprises:
At least one Δ/Y commutation circuit, described Δ/Y commutation circuit is connected with described neutral input end and two voltage input ends, be used in the input signal of described neutral input end and described two voltage input ends, select binary signal to be used for producing described single-phase voltage signal, described Δ/Y commutation circuit comprises:
One Δ/Y judging unit, be used for detecting described in the pressure reduction of Introduced cases end and described two voltage input ends, be that Δ connects or Y connects to judge this three phase mains;
One switches assembly, is used for testing result according to described Δ/Y judging unit, selects whether to export the binary signal of the input signal that comprises described neutral input end;
The accurate position of one input voltage judging unit is used for detecting the pressure reduction of the binary signal that described changeover module selects, and judges whether described pressure reduction falls within the predeterminated voltage scope; And
One step switch unit is connected to the rear end of described changeover module, is used for controlling described Δ/Y commutation circuit and whether exports described single-phase voltage signal to the rear end circuit; And
One start unit is used for judged result according to the accurate position of the input voltage of described Δ/Y commutation circuit judging unit, and whether control exports described single-phase voltage signal.
2, AC power supply according to claim 1, it is characterized in that, also comprise a driving control unit, be used for judged result according to the accurate position of described input voltage judging unit, whether whether the conducting of controlling described step switch unit export described single-phase voltage signal with decision.
3, AC power supply according to claim 2 is characterized in that, described Δ/Y commutation circuit also comprises a power stage, and described power stage is set by described driving control unit by the user, is used for exporting the binary signal that described changeover module is selected.
4, AC power supply according to claim 3 is characterized in that, described power stage comprises an ac/ac power converter.
5, AC power supply according to claim 1 is characterized in that, it is that Y selects when connecing output to comprise the binary signal of the input signal of described neutral input end that described changeover module is used at described Δ/described three phase mains of Y judgment unit judges.
6, AC power supply according to claim 1 is characterized in that, it is the input signal that Δ is selected two described voltage input ends of output when connecing that described changeover module is used at described Δ/described three phase mains of Y judgment unit judges.
7, AC power supply according to claim 1, it is characterized in that, the accurate position of described input voltage judging unit is used for when the pressure reduction of the binary signal that detects described changeover module selection is zero, and the neutral line that produces the described three phase mains of a wiring error signal indication is not connected to described neutral input end.
8, AC power supply according to claim 1, it is characterized in that, also comprise a three-phase voltage sequence switch, on the circuit between being connected between described input voltage accurate position judging unit and described changeover module, be used for controlling the binary signal of whether described changeover module being selected and input to the accurate position of described input voltage judging unit.
9, AC power supply according to claim 8, it is characterized in that, the accurate position of described input voltage judging unit is used for exporting a three-phase voltage sequence switch by another Δ of signal enabling/Y commutation circuit when the pressure reduction of the binary signal that detects described changeover module selection falls within the described predeterminated voltage scope.
10, AC power supply according to claim 9, it is characterized in that, the accurate position of described input voltage judging unit is used for producing the signal of a voltage mistake when the pressure reduction of the binary signal that detects described changeover module selection does not fall within the described predeterminated voltage scope.
11, AC power supply according to claim 9 is characterized in that, described Δ/Y commutation circuit is three, is used for producing three described single-phase voltage signals, and described three Δs/Y commutation circuit is connected to two different voltage input ends respectively.
12, AC power supply according to claim 11, it is characterized in that, institute's three Δ/Y commutation circuits of speed comprise first Δ/Y commutation circuit, second Δ/Y commutation circuit and the 3rd Δ/Y commutation circuit, are used for respectively judging in regular turn whether corresponding single-phase voltage voltage of signals scope falls within the described predeterminated voltage scope.
13, AC power supply according to claim 9 is characterized in that, also comprises a start-up circuit in limited time, is connected to described three-phase voltage sequence switch, is used at the described three-phase voltage sequence switch of a Preset Time conducting.
14, a kind of three phase mains is converted to the method for single-phase voltage signal output, it is characterized in that described method comprises the following steps:
(a) provide a neutral input end and three voltage input ends;
(b) wiring with described three phase mains is connected to described neutral input end and described three voltage input ends;
(c) selected two voltage input ends in described three voltage input ends;
(d) voltage quasi position of the described neutral input end of detection and two chosen voltage input ends is that Δ connects or Y connects to judge described three phase mains; And
(e) if judge that described three phase mains is that Y connects, select a described neutral input end and a chosen voltage input end to produce a single-phase voltage signal, if judge that this three phase mains is that Δ connects, select two chosen voltage input ends to produce a single-phase voltage signal.
15, method according to claim 14 is characterized in that, wherein, step (c) to (e) is triplicate altogether, and selected respectively two incomplete same voltage input ends are to produce three different single-phase voltage signals.
16, method according to claim 14 is characterized in that, also comprises detecting described single-phase voltage voltage of signals scope whether greater than a predeterminated voltage scope, if produce an input voltage and cross large-signal.
17, method according to claim 14 is characterized in that, wherein, if judge that described three phase mains is that Y connects, comprises also whether the pressure reduction that detects described neutral input end and described voltage input end is zero, if produce a wiring error signal.
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| CN2008100675726A CN101599703B (en) | 2008-06-02 | 2008-06-02 | Method for converting three-phase power supply into single-phase voltage output and AC power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9893644B1 (en) | 2016-11-15 | 2018-02-13 | International Business Machines Corporation | Electric power devices with automatically established input voltage connection configuration |
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| JP3702994B2 (en) * | 1999-03-03 | 2005-10-05 | 本田技研工業株式会社 | Power supply |
| CN2701162Y (en) * | 2004-04-05 | 2005-05-18 | 吴永泰 | AC welding or heating power supply with three-phase 50Hz input and single-phase 150Hz output |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9893644B1 (en) | 2016-11-15 | 2018-02-13 | International Business Machines Corporation | Electric power devices with automatically established input voltage connection configuration |
| US10277142B2 (en) | 2016-11-15 | 2019-04-30 | International Business Machines Corporation | Electric power devices with automatically established input voltage connection configuration |
| CN109983645A (en) * | 2016-11-15 | 2019-07-05 | 国际商业机器公司 | With the power equipment for establishing input voltage connection configuration automatically |
| US10587204B2 (en) | 2016-11-15 | 2020-03-10 | International Business Machines Corporation | Electric power devices with automatically established input voltage connection configuration |
| US10615710B2 (en) | 2016-11-15 | 2020-04-07 | International Business Machines Corporation | Electric power devices with automatically established input voltage connection configuration |
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