US20010012207A1 - Power supply device for electromotive railcar - Google Patents
Power supply device for electromotive railcar Download PDFInfo
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- US20010012207A1 US20010012207A1 US09/234,714 US23471499A US2001012207A1 US 20010012207 A1 US20010012207 A1 US 20010012207A1 US 23471499 A US23471499 A US 23471499A US 2001012207 A1 US2001012207 A1 US 2001012207A1
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- Prior art keywords
- voltage
- supply device
- capacitor
- power supply
- electromotive
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
- B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Dc-Dc Converters (AREA)
Abstract
A power supply device for an electromotive railcar comprises a first capacitor connected to receive a DC voltage for outputting a first DC voltage, a DC/AC/DC converter, including an inverter bridge including power transistors connected to the first capacitor in parallel, an insulating transformer with high carrier frequency having a primary winding connected to an output of the inverter bridge and a rectifier circuit connected to a secondary winding of the insulating transformer to receive a second DC voltage, and a three-phase inverter including a bridge circuit of power transistors for generating a three-phase AC voltage on the basis of the second DC voltage.
Description
- 1. Field of the Invention
- This invention relates to a power supply device for an electromotive railcar which insulates a three-phase alternating current (AC) voltage from a direct current (DC) voltage from an external electric line and, more particularly to a power supply device having DC/AC/DC converters.
- 2. Discussion of the Background
- FIG. 5 is a circuit diagram of a conventional power supply device for an electromotive railcar.
- In FIG. 5, the power supply device obtains a DC voltage from an
electric power line 1. The DC voltage charges an electrolytic capacitor 8 via a pantograph 2, afuse 3, a contactor 4 (contact breaker ), a DC reactor 5 and aninitial charge resistor 7. When the electrolytic capacitor 8 is charged to a predetermined voltage, a conductingthyristor 6 connected in parallel with theinitial charge resistor 7 turns on. Then a three-phase inverter 9 is operated. - The three-
phase inverter 9 generates a three-phase AC voltage 13 on the basis of the DC voltage from theelectric power line 1. Output waveforms of the three-phase inverter 9 are well-known PWM (Pulse Width Modulation ) sinewaves including many higher harmonics. - Therefore, the higher harmonics are removed by passing the voltage signal through an AC filter comprising an
AC reactor 10 for smoothing and an AC capacitor 11, and then a commercial power signal with 50 Hz or 60 Hz and 200 V is obtained. The electrolytic capacitor 8 and the three-phase inverter 9 are coupled to aground 14. - The commercial power signal is mainly used for operating air conditioners and lighting on railcars. Moreover, the commercial power signal is insulated through an
insulating transformer 12 with a commercial carrier frequency for the purpose of insulating the three-phase AC voltage 13 from the DC voltage from theelectric power line 1. - After a commercial voltage (for example 270V ) is obtained, the commercial voltage is insulated by the
insulating transformer 12 whose carrier frequency is a commercial frequency of 50 Hz or 60 Hz. A control device disclosed in Japanese Patent Disclosure (kokai) No. 7-31156 is applicable for the controller of the three-phase inverter 9. - However, there are some problems in the conventional power supply device of FIG. 5.
- First, the
insulating transformer 12 becomes heavy and large, because the carrier frequency is a relatively low commercial frequency. Moreover, the insulatingtransformer 12 causes noise of the commercial frequency. - Further, the same voltage as that of the
electric power line 1 is applied to the three-phase inverter 9, theAC reactors 10 and the AC capacitors 11. Therefore, the conventional power supply device must be suitably insensitive to voltage fluctuations and becomes collectively large and costly. - Furthermore, load fluctuation from load objects, such as air conditioners or lighting, causes an adverse influence on the current of the DC voltage from the
electric power line 1. Therefore, the electrolytic capacitor 8 charged with the DC voltage must be large enough to remove a ripple wave (50 Hz or 60 Hz) caused by the load fluctuation. - Accordingly, one object of this invention is to provide a miniaturized, light weight, low noise and low price power supply device for an electromotive railcar. The present invention provides a power supply device for an electromotive railcar, and comprises a first capacitor connected to receive the DC voltage for outputting a first DC voltage. The power supply device also comprises a DC/AC/DC converter that includes an inverter bridge having power transistors connected to the first capacitor in parallel, an insulating transformer with high carrier frequency having an primary winding connected to an output of the inverter bridge, and a rectifier circuit connected to a secondary winding of the insulating transformer to receive a second DC voltage. The power supply device further comprises a three-phase inverter having a bridge circuit of power transistors for generating a three-phase AC voltage on the basis of the second DC voltage.
- A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
- FIG. 1 is a circuit diagram showing a power supply device for an electromotive railcar according to a first embodiment of the present invention;
- FIG. 2 is a circuit diagram of a partial resonance switching circuit of a third embodiment of the present invention;
- FIG. 3 is a circuit diagram of a discharge circuit of a fourth embodiment of the present invention;
- FIG. 4 is a circuit diagram showing a smoothing circuit of a fifth embodiment of the present invention; and
- FIG. 5 is a circuit diagram showing a conventional power supply device for an electromotive railcar.
- Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, the embodiments of the present invention are described below.
- FIG. 1 is a circuit diagram showing a power supply device for an electromotive railcar according to a first embodiment of the present invention. The power supply device of the first embodiment of the present invention omits the electrolytic capacitor8 and the
insulating transformer 12 of the conventional power supply device of FIG. 5 and adds some elements as described below. - The power supply device for an electromotive railcar receives a first DC voltage from an
electric power line 1. - A series circuit of a pair of
first capacitors electric power line 1 via a pantograph 2, afuse 3, a contactor 4, a DC reactor 5, and either a conductingthyristor 6 or aninitial charge resistor 7. - An H-
type inverter bridge 58 comprises a plurality of power transistors 23-26 and a plurality of diodes 60-63. An H-type inverter bridge 59 comprises a plurality of power transistors 27-30 such as IGBT (Insulated Gate Bipolar Transistor) and a plurality of diodes 64-67. The H-type inverter bridge 58 is connected in parallel to afirst capacitor 21. The H-type inverter bridge 59 is connected in parallel to afirst capacitor 22. Thefirst capacitor 22 and the H-type inverter bridge 58 are coupled to aground 14. - Thus, the H-
type inverter bridges first capacitors - A pair of
insulating transformers type inverter bridges -
Rectifier circuits 68, 69 each are connected to a respective secondary winding of theinsulating transformers rectifier circuits 68, 69 are connected in parallel to each other. - A pair of DC/AC/DC converters comprises a respective one of the H-
type inverter bridges insulating transformers rectifier circuits 68, 69. - A
smoothing circuit 70 comprises aDC reactor 41 and asecond capacitor 42 and is connected to the outputs of therectifier circuits 68, 69 to form a second DC voltage. The three-phase AC voltage 13 is obtained from the three-phase inverter 9 on the basis of the second DC voltage. - Further, each of the AC filters comprising a series circuit of the
AC reactor 10 and the AC capacitor 11 is connected to the output of each phase of the three-phase inverter 9. Terminals of the AC capacitors 11 are connected to a neutral point (0V) of the secondary windings of theinsulating transformers - A control circuit for the power transistors23-30 of the H-
type inverter bridges - A reference voltage of the DC/AC/DC converters' output is determined by a voltage setter43. An
adder 44 is coupled to the voltage setter 43 and the output of thesmoothing circuit 70 and calculates a difference between the reference of a DC voltage and the second DC voltage. Anamplifier 45 amplifies the difference with a proportional integral operation. A PWM (Pulse Width Modulation )generator 46 compares the amplified difference with the output of atriangular wave generator 47 and modulates the pulse width. A plurality ofgate drive amplifiers - The DC/AC/DC converters control the high voltage of the first DC voltage so as to obtain a constant DC voltage suited for the three-
phase AC voltage 13 generated by the three-phase inverter 9. Although the first DC voltage is changeable, the DC/AC/DC converters keep the output steady. - A description of the operation of the power supply device of FIG. 1 follows.
- In FIG. 1, the power supply device obtains the first DC voltage from the
electric power line 1 via the pantogragh 2. The first DC voltage charges thefirst capacitors fuse 3, the contactor 4, the DC reactor 5 and theinitial charge resistor 7. When thefirst capacitors thyristor 6 connected in parallel with theinitial charge resistor 7 turns on. - The output signals of the
first capacitors gate drive amplifiers transformers rectifier circuits 68, 69. - The smoothing
circuit 70 smoothes the DC voltage to obtain the second DC voltage. The three-phase inverter 9 generates the three-phase AC voltage 13 on the basis of the second DC voltage. - The AC filters composed of
AC reactors 10 and AC capacitors 11 remove the higher harmonics of the three-phase AC voltage 13 to obtain a commercial voltage with a fundamental wave such as 50 Hz or 60 Hz frequency. - Thus, a stable DC voltage for the second DC voltage is obtained without being influenced by the voltage of the electric power line1 (the first DC voltage).
- The power supply device of the first embodiment has the following effects.
- First, since the insulating
transformers transformers - Second, the voltage susceptibility of the secondary side of the insulating
transformers phase AC voltage 13 of less than 440V, the DC/AC/DC converters output voltage is about 600V. So the components of the secondary side can be designed with relatively low voltage susceptibility and use both small-sized and low cost equipment. - Third, if the sharing of loads between the H-type inverter bridges58, 59 changes, the H-type inverter bridges 58, 59 are not able to share the first DC voltage by halves. Further, if almost all the first DC voltage is applied to one of the H-type inverter bridges 58, 59, the power transistors 23-26 or 27-30 may fail. However, since each of the outputs of the
rectifier circuits 68, 69 is connected in parallel, the unbalance load sharing between the H-type inverter bridges 58, 59 is canceled. - Specifically, if the load in the H-type inverter bridges58 increases, the voltage of the
first capacitor 21 connected to the H-type inverter bridge 58 decreases. Consequently, the output voltage of the secondary winding also decreases. On the other hand, the voltage of the otherfirst capacitor 22 increases and the output voltage of the secondary winding connected to the other H-type inverter bridge 59 increases. - As a result, the load concentrates on the H-
type inverter bridge 59 with a higher voltage. This operation is taken quickly and finally the load sharing between the H-type inverter bridges 58, 59 is equal. - Furthermore, each of the DC voltages applied to the H-type inverter bridges58, 59 becomes equal. Consequently, the power transistors 23-30 can be used as low voltage-proof elements.
- Fourth, since the terminals of the AC capacitors11 are connected to a neutral point (0V ) of the secondary windings of the insulating
transformers 31, 32 (e.g., the neutral point (0V ) of the second DC voltage), the inductive interference caused by the three-phase inverter 9 is attenuated. Specifically, since the peak current applying to the AC capacitors 11 is half of the amplitude of the current applying to the AC capacitors 11, the inductive interference caused by the switching noise of the three-phase inverter 9 is attenuated. - As described above in the first embodiment, the power supply device obtains a steady DC voltage as the second DC voltage with no influence of the first DC voltage from the
electric power line 1 and achieves miniaturization, light weight, low level noise and attenuation of inductive interference. - Further, the number of the
first capacitors first capacitors - Furthermore, the insulating
transformers - To achieve low noise, the generated frequency should be less than the audio range (15 KHz). Accordingly, the carrier frequency should be less than 7.5 KHz, half of 15 KHz, as calculated in accordance with conventional theory.
- On the other hand, to achieve miniaturization and light weight, a carrier frequency less than 6 KHz is useful. More than a 6 KHz carrier frequency may not achieve sufficient tradeoffs in view of the switching loss of the power transistors23-30. Consequently, a 1 to 6 KHz carrier frequency is useful from the point of view of miniaturization, lightweight and low noise.
- Further, the capacity of the
second capacitor 42 is large enough, the same as that of the capacitor 8 (FIG. 5), so as to remove a ripple wave with a predetermined frequency which is a commercial frequency (50 Hz or 60 Hz). Consequently, the load fluctuation caused by the load objects connected to the three-phase inverter 9 does not influence the current of the first DC voltage from theelectric power line 1. As a result, the capacity of thefirst capacitors electric power line 1. As a practical matter, the capacity of thefirst capacitors second capacitor 42. - The ripple wave passed through the
first capacitors electric power line 1 and the ripple wave passed through thesecond capacitor 42 is 50 Hz or 60 Hz under the influence of three-phase inverter 9. If thesecond capacitor 42 can filter the 50 Hz ripple wave, thefirst capacitor - Consequently, since the ripple wave with commercial frequency caused by the load fluctuation is filtered by the
second capacitor 42, a small capacitor can be used as thefirst capacitors - According to a second embodiment of the present invention, each of the insulating
transformers - FIG. 2 is a circuit diagram showing a partial resonance switching circuit of a third embodiment of the present invention.
- As shown in FIG. 2, this embodiment deletes the
first capacitor 22, the H-type inverter bridge 59 with the transistors 27-30, the insulatingtransformer 32 and the rectifier circuit with the diodes 37-40 in FIG. 1. The circuit of this embodiment has one DC/AC/DC converter comprising thefirst capacitor 21, the H-type inverter bridge 58 having the transistors 23-26, the insulatingtransformer 31 and the rectifier circuit (not shown in FIG. 2) with the diodes 33-36. Further, partialresonance switching circuits type inverter bridge 58. The commutation system of the H-type inverter bridge 58 is a partial resonance type which switches the power transistors 23-26 at the time zero-voltage or zero-current is applied to the power transistors 23-26. - Therefore, the switching loss of the power transistors23-26 is minimized or deleted and only the ON loss of the power transistors 23-26 is accounted for.
- In general, a switching loss is generated at a transient stage when a power transistor switches ON to OFF or OFF to ON, and it is calculated by the product of voltage and current. An ON loss is generated at a steady state after the transient stage while a power transistor is ON. It is also calculated by the product of voltage and current. In a DC/AC/DC converter with a high frequency insulating transformer, the switching loss of transistors increases in addition to the ON loss of the transistors.
- In the third embodiment of the present invention, since the commutation system of the H-
type inverter bridge 58 is a partial resonance type which switches the power transistors 23-26 at the time zero-voltage or zero-current is applied to the power transistor, the switching loss of the power transistors is minimized or deleted. The loss accompanied with high frequency switching can be reduced. - FIG. 3 is the circuit diagram showing the discharge circuit of a fourth embodiment of the present invention.
- As shown in FIG. 3, this embodiment adds a discharge circuit, connected to the
second capacitor 42 in parallel, comprising a series circuit of apower transistor 52 and adischarge resistor 53, and a voltage surveillance circuit 54, connected to asecond capacitor 42 in parallel, for detecting the second DC voltage. - If the voltage surveillance circuit54 detects a voltage over a predetermined voltage, it turns on the
power transistor 52 via atransistor drive amplifier 55 in order to discharge regeneration energy from load objects. The discharge circuit of this embodiment protects the transistors of the three-phase inverter 9 from high voltage of the second DC voltage. - In brief, the power supply unit in FIG. 1 may not discharge regenerated energy from load objects, such as air conditioners and lighting. Consequently once the second DC voltage rises over the rated voltage of a transistor, the transistor may fail.
- In this embodiment, since the voltage surveillance circuit54 detects the second DC voltage, if the second DC voltage rises over the predetermined voltage, first the voltage surveillance circuit 54 outputs a detecting signal to the
transistor drive amplifier 55, then thetransistor drive amplifier 55 turns on thepower transistor 52, and then the regenerated current is passed through thedischarge resistor 53. Finally, the regenerated energy is discharged and the second DC voltage drops. - The
power transistor 52 turns off and stops discharge when the second DC voltage drops below the second predetermined voltage. The second predetermined voltage for turning off thepower transistor 52 is lower than the predetermined voltage for turning on thepower transistor 52. Thepower transistor 52 keeps an average voltage constant and discharges the regenerated energy by repeatedly switching ON and OFF. - Therefore this embodiment controls an increase in the second DC voltage caused by load objects, and protects the power transistors of the three-
phase inverter 9 from application of a high voltage. - FIG. 4 is the circuit diagram showing a smoothing circuit according to a fifth embodiment of the present invention.
- As shown in FIG. 4, the smoothing circuit of this embodiment comprises a series circuit of a pair of
capacitors 56, 57 instead of thesecond capacitor 42. Further, one terminal of each of the AC capacitors 11 is connected to a neutral point between thecapacitors 56, 57. - Since the terminals of the AC capacitors11 are connected to a neutral point (0V) between the capacitors 56, 57 (e.g., the neutral point (0V) of the second DC voltage), the peak current of the AC capacitors 11 is half of that amplitude and the capacity of AC capacitors 11 can be smaller. Further, the inductive interference caused by the three-
phase inverter 9 is attenuated. - Consequently, the power supply device of the present invention can be miniaturized, light weight, low noise and low price.
Claims (15)
1. A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising:
a first capacitor connectable to receive said external DC voltage and outputting a first DC voltage in response to the external DC voltage;
a DC/AC/DC converter including an inverter bridge having a plurality of power transistors connected to said first capacitor in parallel, an insulating transformer with a high carrier frequency and having a primary winding connected to an output of said inverter bridge, and a rectifier circuit connected to a secondary winding of said insulating transformer to receive a second DC voltage; and
a three-phase inverter including a bridge circuit having a plurality of power transistors for generating a three-phase AC voltage on the basis of said second DC voltage.
2. The power supply device for an electromotive railcar as recited in , wherein a carrier frequency band of said insulating transformer of said DC/AC/DC converter is in the range of 1 to 6 KHz.
claim 1
3. The power supply device for an electromotive railcar as recited in , wherein said inverter bridge is a commutation system having a partial resonance which switches each of said power transistors at the time a zero-voltage or a zero-current is applied to each of said power transistors.
claim 1
4. The power supply device for an electromotive railcar as recited in , further comprising a smoothing circuit including a DC reactor and a second capacitor for smoothing said second DC voltage from an output of said rectifier circuit of said DC/AC/DC converter.
claim 1
5. The power supply device for an electromotive railcar as recited in , wherein a capacity of said second capacitor is large enough so as to remove a ripple wave with a predetermined frequency caused by load fluctuation.
claim 4
6. The power supply device for an electromotive railcar as recited in , further comprising:
claim 1
a discharge circuit including a series circuit of a power transistor and a discharge resistor connected to discharge said second DC voltage; and
a voltage surveillance circuit for detecting said second DC voltage and turning on said power transistor at a time said voltage surveillance circuit detects that said second DC voltage is over a predetermined voltage in order to discharge regeneration energy from load objects.
7. The power supply device for an electromotive railcar as recited in , further comprising:
claim 1
an AC filter including a series circuit of an AC reactor and an AC capacitor connected to an output of each phase of said three-phase inverter; and
one terminal of said AC capacitor being connected to receive a neutral point of said second DC voltage.
8. The power supply device for an electromotive railcar as recited in , further comprising:
claim 1
an AC filter including a series circuit of an AC reactor and an AC capacitor connected to an output of each phase of said three-phase inverter; and
one terminal of said AC capacitor being connected to a neutral point of said secondary winding of said insulating transformer.
9. A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising:
a series circuit of a plurality of first capacitors connected to receive said external DC voltage for outputting a first DC voltage;
a plurality of DC/AC/DC converters, each of said DC/AC/DC converters including an inverter bridge having a plurality of power transistors respectively connected to one of said plurality of first capacitors in parallel, an insulating transformer with a high carrier frequency and having a primary winding connected to an output of said inverter bridge, and a rectifier circuit connected to a secondary winding of said insulating transformer to receive an second DC voltage; and
a three-phase inverter including a bridge circuit having a plurality of power transistors for generating a three-phase AC voltage on the basis of said second DC voltage.
10. The power supply device for an electromotive railcar as recited in , wherein:
claim 9
each of said insulating transformers has a common core; and
the number of turns of said primary windings are the same in said DC/AC/DC converters and the number of turns of said secondary windings are the same in said DC/AC/DC converters respectively.
11. The power supply device for an electromotive railcar as recited in or , further comprising:
claim 1
9
a discharge circuit including a series circuit of a power transistor and a discharge resistor connected to discharge said second DC voltage; and
a voltage surveillance circuit for detecting said second DC voltage and turning on said power transistor at a time said voltage surveillance circuit detects that said second DC voltage is over a predetermined voltage in order to discharge regeneration energy from load objects.
12. The power supply device for an electromotive railcar as recited in or , further comprising:
claim 1
9
an AC filter including a series circuit of an AC reactor and an AC capacitor connected to an output of each phase of said three-phase inverter; and
one terminal of said AC capacitor being connected to receive a neutral point of said second DC voltage.
13. The power supply device for an electromotive railcar as recited in or , further comprising:
claim 1
9
an AC filter including a series circuit of an AC reactor and an AC capacitor connected to an output of each phase of said three-phase inverter; and
one terminal of said AC capacitor being connected to a neutral point of said secondary winding of said insulating transformer.
14. A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising;
a first capacitor having a first terminal to receive said DC voltage and for providing a first DC voltage in response to the external DC voltage and having a second terminal;
a DC/AC/DC converter having a pair of inputs connected in parallel to the first and second terminals of the first capacitor and having a pair of outputs for providing a second DC voltage in response to the external DC voltage; and
a three-phase inverter having a pair of inputs connected in parallel to the pair of outputs of the DC/AC/DC converter and having three outputs for generating a three-phase AC voltage in response to said second DC voltage.
15. The power supply device for an electromotive railcar as recited in , wherein the DC/AC/DC converter comprises:
claim 14
an inverter bridge having a plurality of power transistors and having a pair of inputs connected in parallel to the first capacitor and having a pair of outputs;
an insulating transformer having a primary winding connected in parallel to the outputs of the inverter bridge and having a secondary winding for providing the second DC voltage; and
a rectifier circuit connected to the secondary winding of the insulating transformer to receive the second DC voltage.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP10-018873 | 1998-01-30 | ||
JP01887398A JP3361047B2 (en) | 1998-01-30 | 1998-01-30 | Power supply for vehicles |
JPP10-018873 | 1998-01-30 |
Publications (2)
Publication Number | Publication Date |
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US20010012207A1 true US20010012207A1 (en) | 2001-08-09 |
US6388904B2 US6388904B2 (en) | 2002-05-14 |
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ID=11983673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/234,714 Expired - Fee Related US6388904B2 (en) | 1998-01-30 | 1999-01-21 | Power supply device for electromotive railcar |
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US (1) | US6388904B2 (en) |
JP (1) | JP3361047B2 (en) |
KR (1) | KR100349734B1 (en) |
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US20040252431A1 (en) * | 2001-09-19 | 2004-12-16 | Peter Kunow | Universal energy supply system |
US20050013148A1 (en) * | 2001-09-19 | 2005-01-20 | Peter Kunow | Universal power supply system |
US20050029476A1 (en) * | 2000-05-11 | 2005-02-10 | Cooper Cameron Corporation | Electric control and supply system |
US20050185349A1 (en) * | 2000-10-30 | 2005-08-25 | Klaus Biester | Control and supply system |
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Also Published As
Publication number | Publication date |
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KR100349734B1 (en) | 2002-08-22 |
US6388904B2 (en) | 2002-05-14 |
KR19990068197A (en) | 1999-08-25 |
JPH11215841A (en) | 1999-08-06 |
JP3361047B2 (en) | 2003-01-07 |
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