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`Notice
`This translation is machine-gererated. lt cannot be guaranteed that it is intelligible, accurate,
`complete, reliable or fit for specific purpases, Critical decisions, such as commercially relevant or
`financial decisions, should net be based on machine-translation output.
`
`DESCRIPTION JPHO08275532A
`
`[O00 1]
`is INDUSTRIAL APPLICABILITY The present invention relates to a single-phase input thyristor
`rectifier connected to a power source having a large voltage waveformdistortion, a power
`source in which instantaneous voltage fluctuations occur, and thelike,
`
`[O02]
`is Conventional Techniques Conventionally, as a thyristorrectifier, a unifunction transistor (UJT)
`ara programmable unifunction transistor (PUT) has been used to generate a thyristorfiring
`pulse.
`22 Recently, a dedicated IC forfiring a thyristor is commercially available In order to synchronize
`the phase of the thyrister ignition pulse, these devices had a thyristor rectifier that resets the
`phase shift circuit composed of CR byzero crossing of the AC input voltage and controls the
`constant voltage or constant current,
`
`[O003]
`2e However, in the above-mentioned conventional thyristor rectifier, a zero cross at the
`synchronous voltage occurs in addition to the original AC voltage waveform dueto the pulse
`like drop of the power supplyvoltage, and (a) in FIG. In waveforms such as and(c), an extra
`zero cross occurs during the half cycle, and a thyristor firing pulseis generated at this point.
`resulting in a thyristorfalse firing.
`24 In addition, when the input voltage drops significantly due to the turning on of a large-capacity
`device on the power supply side, that is, when the voltage waveform shownin {) in FIG, 3
`eccurs and recovers, the DC outputis overvoltage or overvoltage due to the delay ofthe
`control system. Current may be generated. FIG. 4 shows thecircuit configurationofa
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`conventional thyristor rectifier. There is a single-phase thyristor rectifier circuit 3 on the
`secondaryside of the transformer 2 connected to the single-phase AC power supply 1, and the
`phase-contralled DC output is smoothed by the smoothing reactor 4 and the smoothing
`capacitor 5 and passed through the shunt 6 to the load 7. ft is supplied to the DC load 8 and
`the battery 9. The control is to control each error output with a constant current or a constant
`voltage by a current comparison amplifier 13 that compares and amplifies the potential of the
`shunt 6 anda voltage comparison amplifier 14 that compares and amplifies the voltagefrom a
`detection point near the DC output terminal 10. [tis connected to the pulse generation unit E11
`as a phase shift signal via the OR circuit 12 of the above. The voltage camparison amplifier 14
`includes a reference voltage generating unit 15 and a soft start circuit 16 that graduallyraises
`an erronecaus reference voltage at startup. The synchronous input terminal 17 of the pulse
`generating anit 11 has a CR filter 18 from the secondary winding 20 of the control
`transformer 19 from the AC input 1 via the control transformer 19, and absorbs the pulse-like
`drop included in the AC input voltage. To do. The pulse-like dip shownin(a) of FIG. 3 is
`absorbed by the CR filter. A wide dip as shown in Fig. (CQ) cannot be absorbed bythe CR filter
`and zero cross occurs. Such a wide voltage drop can be absorbed by enlarging the CR filter,
`but the synchronous voltage phase is delayed by the time constant of the CR filter with respect
`te the voltage applied to the thyristor, and thefiring phase range of the thyrister becomes
`longer. It gets narrower. Further, in response to the momentary voltage drop as shownin FIG.
`3 {b), the DC output voltage is controlled by a constant voltage, so that the control angleis
`reduced in the next half cycle, and the valtageis recovered instantaneously. There was a
`problem that overvoltage and overcurrent were generated.
`
`[O004]
`«3 An object of the present invention is to provide a thyristor rectifier that prevents thyrister
`misfire, DC output overvoliape, and overcurrent in response to a wide voltage drop of an input
`power supply or a large voltage drop that occurs instantaneously. Is to provide.
`
`[O005]
`ee [Means for Solving the Problems| In order to solve the abeve problems, the present Invention
`performs full-wave rectification of the input voltage of a single-phase input thyristorrectifier,
`compares it with a constant DC level, and pulses the input voltage. Detects a drop in voltage or
`a momentary drop in voltage,
`rs When the detected voliage drop time is longer than a certain time, the thyristor ignition pulse
`is stopped and the soft start circuit is also reset.
`
`[OO0b]
`rs [Action] When a wide surge-like voltage drop or instantaneous voltage drop that cannot be
`absorbed by the CR filter that has entered the synchronous circuit is detected, the thyristor’s
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`ignition is temporarily stopped, and the power supply voltage returns te normal. The thyristor
`is ignited again and the output voltage is soft-started.
`
`[0007]
`as [Example] An embediment of the present irwention will be described.
`sé FIG.
`1 illustrates an embodiment of the present invention, and thecircuit configurationis the
`circuit of MG. 4 with a voltage drop detection circuit and the lke added.
`as The secondary winding 20 of the control transformer 19 has a CR filter 18 between the
`secondary winding 20 of the pulse generator 11 and the synchronous input terminal 17, and a
`CR filter 22 having the same time constant is the tertiary winding of the control transformer
`i9. it has in 21.
`
`az The AC input voltage is full-wave rectified by the commutator 24 throughthe CR filter 22, and
`compared with the reference voliages Erl and Er2 in the comparators 25 and 26, respectively.
`In FIG. 2, the rectified output is EO shown in FIG. 2 (B) with respect to the input voltage
`waveform (A). The output El of the comparator 25 with respect to the reference voltage Eri is
`E1 shown in FIG. 2 {E), and the output EZ of the comparator 26 with respect to the reference
`voltage Er2 is shown in FIG. Rach output of the comparators 25 and 26 is connectedte the
`data Input D of the D Philip Hep 28 and the A input of the monostable multivibrator 27,
`respectively. The output of the comparator 26 is delayed by t by the time constants R3 and
`C3 of the monostable multivibrator 27.The Qoutput E3 of the monostitable multivibrator
`27 is obtained and is shownin FIG. tis connected to the clock pulse Input C of the P28. The
`comparator 25 detects the level of the input voltage waveform, and the RC filter 22 removes
`the voltage drop as shown in {a) of the figure (A) of the input voltage waveform, and the RC
`fkter 18 of the synchronous circuit also works effectively. To do. In such a case or at the time
`of normal voltage input, the output Q of the D flip-flop 28 outputs a normal value as shown in
`Fig. 2 (F). This output Q is connected to the prohibition input 23 of the pulse generation unit
`il, and the pulse generation unit 11 outputs a thyristor firing pulse fram Q and Q. When
`the level of the output Q of the D flip-flop 28 is 0. the thyristor firing pulse of the pulse
`generating unit 11 is stopped, and the soft start circuit 16 is reset. Whenthe input voliage
`drops abnormally as shown in FIGS. 2 (b), ()}, and (a), and when there is a significant partial
`drop, the output QO of the D flip-flap 28 becomes 0. Stop the thyristor firing pulse. When the
`AC input veltage returns to normal, the thyristor starts fring again and the thyristorrectifier
`soft-starts its output. Even if the thyristor temporarily stops operating, if has a battery and the
`power supply to the load is continued without any trouble.
`
`[0008]
`zis INDUSTRIAL APPLICABILITYAs described above, the psyllista rectifier according to the
`present invention temporarily stops the firing pulse of the psyllista In responseto a
`significant drop in AC input voltage, a momentary voltage drop, or a momentary power
`failure. When the abnormality of the AC inpat veltage is recovered, the output is gradually
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`obtained by soft start again. Therefore, compared to the conventional thyristor rectifier, the
`overvoltage and excess of the DC outpat when the abnormality of the AC input voltageis
`recovered, It is possible to prevent the generation of current, and especially as a DCload, the
`effect is remarkably excellent ina DC power supply device that has a battery, such as a DC
`power supply device that has the same power supply system as the train overhead line and a
`mobile lifting magnet. The DC power supply device for this unit receives the AC input power
`supply of the overhead wire and is used in combination with the battery. It operates stably
`against a large drop in the AC input power supply, a momentary voltage drop, and a
`momentary powerfailure, resulting in an overcurrent. [ft is excellent in terms of stable systern
`operation, such as prevention of blown thyristor protection fuse, trip of input overcurrent
`breaker, and overvoltage of DC ontput voltage.
`
`[OOO9}
`136 A brief description of the drawing
`
`[OO LO]
`Ho FIG. 1 is a circuit diagram showing an embodiment of a thyristor rectifier according to the
`present invention.
`
`[OOLL
`a5 FIG. 2 is a diagram showing the operation of each part of the thyristor rectifier according to
`the present invention.
`
`[OO 12}
`ise FG, 3 is a diagram showing a waveferm of an AC input power supply.
`
`[0013]
`isa BIG. 4 is a circuit diagram showing a conventicnal thyristorrectifier.
`
`[OOL4]
`138 Description of the sign
`
`[OO LS]
`ie2 | is a single-phase AC power supply, 2 is a transformer, 3 is a single-phase thyristor rectifier
`circuit, 4 is a smoothing reactor, 5 is a smoothing capacitor, 6 is a shunt, 7 is a load, 8 is a DC
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`load, 9 is a battery, and 10 is. Output terminal, 11 is pulse generator, 12 is OR circuit, 13 is
`current comparison amplifier, 14 is voltage comparison amplifier, 15 is reference voltage
`generator, 16 is soft start circuit, 17 is synchronous input terminal, 18 is CRfilter, 19 is a
`control transformer, 20 is a control transformersecondary winding, 21 is a control
`transformer tertiary winding, 22 is a CR filter, 23 is a prohibited input, 24is a shunt, 25 is a
`comparator, 26 is a comparator, 27. Is a monostable multi-vibrator, 28 is a Dflip flap.
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`
`Notice
`This translation is machine-gererated. lt cannot be guaranteed that it is intelligible, accurate,
`complete, reliable or fit for specific purpases, Critical decisions, such as commercially relevant or
`financial decisions, should net be based on machine-translation output.
`
`CLAIMS JPHO8275532A
`
`1.
`
`iina single-phase input thyristor rectifier connected to a power supply system with large
`valtage waveform distortion or a power supply system where instantaneous voltage
`fluctuations occur, an RC filler inserted into the synchronous power supplyofthe thyristor
`ignition pulse and full-wave rectification of the AC input voltage A circuit that compares the
`generated wavetormwith the reference voltage, a circuit that detects that a certain amount of
`time has passed for the AC input voltage to drop, a soft start circuit that gradually reduces the
`thyristor control angle at startup, and a thyristor ignition pulse. It has a circuit to stop, and
`whenthe AC input voliage drops for a longer time than the time constant of the RC filter, the
`thyristor ignition pulse is stopped, and when the AC input voltage drop recovers, the thyrister
`ignition pulse is re-executed. A thyristor rectifier that is configured to generate and soft start.
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