• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A plurality of main rectifiers are connected to a transformer secondary with one terminal, the other terminal being connected to the load circuit. A sensing circuit is provided to detect over-current conditions. A rapid turn-off circuit is connected to provide reverse current to the rectifier elements, the rapid turn-off circuit being triggered by the sensing circuit and having a series connected control switch, typically a thyristor (SCR), an energy storage device (typically a condenser) and a pair of connections, one of which preferably includes a diode, and connects back to the load terminal of the main rectifier, the other connection, preferably including a smoothing choke, being connected back to the transformer, so that, when the thyristor is triggered, reverse current will be applied to the rectifier and, additionally, the thyristor will be held conductive by current through the transformer and the thyristor connection to the rectifiers.
    公开号:SU1003777A3
    申请号:SU711731190
    申请日:1971-12-28
    公开日:1983-03-07
    发明作者:Вер Рольф；Гетц Экарт
    申请人:Роберт Бош Гмбх (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a conversion technique and can be used in power supply devices requiring protection in case of overcurrent. Some of the maximum level, for example, for supplying galvanic baths.
    Converters of alternating voltage to DC are known, providing 10 current-limiting protection [1].
    The disadvantage of the converters is the low speed of the current-limiting device. fifteen
    A known converter of AC to DC, in which for current-limiting protection uses forced switching of power thyristors [2]. 20
    The disadvantage of this converter is a low voltage level on the switching capacitor and, as a result, low reliability.
    Closest to the proposed 25 is an AC voltage converter containing a three-phase transformer, the secondary windings of which have a common point and are connected to a power controlled rectifier, sp.
    and a switching unit, the switching capacitor of which, through the switching device, is connected to an additional
    J a power source whose voltage value is greater than the operating one, the first output of the switching capacitor connected to the common point of connection of the cathodes of the valves, the anode of each of which is connected to the corresponding AC input of the power controlled rectifier, and the second output of the switching capacitor through the resistor or the valve is connected to a direct current terminal of a power controlled rectifier [3]. A disadvantage of the known converter is its low switching capacity.
    The purpose of the invention is to increase the switching ability.
    This goal is achieved by the fact that the AC / DC converter contains a three-phase transformer, the secondary windings of which have a common point and are connected to a power controlled rectifier, and a switching unit, the switching capacitor of which is connected through a switching device
    with an additional power source, the voltage value of which is greater than the operating one, the first output of the switching capacitor connected to a common point of connection of the cathodes of the valves, the anode of each of which 5 is connected to the corresponding AC input of the power controlled rectifier, and the second output of the switching capacitor through a resistor or the valve is connected to the direct current output of the power controlled rectifier, equipped with an additional controlled switching element that is connected between a common point connecting the cathodes of the valves 15 and the first output of the switching capacitor, the second output of the switching capacitor through a current limiter is connected to a common point of the secondary winding of the transformer.
    The drawing shows a schematic diagram of a device.
    The primary winding 4 of the transformer is connected to a three-phase AC network 1 through fuses 2 and a main 25 switch 3
    5. The secondary windings 6 of the transformer are interconnected by means of a reactive inductor 7. Each of the secondary windings 6 is connected to the anode 130 of the corresponding thyristor 8, the cathodes of which are combined into a node. In addition, a diode 9 is connected to each secondary winding of the transformer 5, the cathodes of which are connected together. 35 The common point of the connection of the diodes 9 is fed to the anode of the quenching thyristor 10, the cathode of which is connected through the quenching capacitor 11 to the anode of the diode 12, the cathode of which is connected to the common point DO of the cathodes of the thyristors 8. Parallel to the quenching capacitor 11 is a series circuit of a DC generator 13, a switch 14 and current limiting resistor 15. When the circuit breaker 14 is closed, the DC generator 13 recharges the quenching capacitor 11 to a higher voltage relative to the operating voltage available at terminals 16 and 17.
    A smoothing inductor is connected to the anode of the diode 12 as a current limiter 18. Further, a measurement resistance 19 is provided, connected between the output terminal 16 and 55 by a common connection point of the thyristor cathodes 3. In addition, the main load resistance 20 is supplied parallel to the output terminals 16 and 17.
    * The principle of operation of the device is as follows;
    When the primary winding 4, transformer 5 is closed with the network 1 of three-phase alternating current, secondary voltages 5 of transformer 5 of transformer 5 are induced. Six thyristors 8 are used to rectify and regulate voltages and currents 8. On the measuring resistance 19 located between the output terminals 16 and the cathodes of the thyristors 8, respectively, the current flowing through it, a voltage is released which, when it exceeds a certain set value, starts a shutdown circuit breaker (not shown) which ignites the quenching thyristor 10. When the quenching thyristor becomes conductive, the quenching capacitor 11 is discharged. In this case, at the first moment, a short-term current flows through the diode 12 and through the still conducting thyristor 8, one of the diodes 9 and through the quenching thyristor .. Next, a part of the discharge current flows through the smoothing inductor, surge reactor and one of the secondary windings b, and also through one of the diodes 9 and the quenching thyristor 10. Due to this discharge process and after the end of the current flowing through the diode 12 and one of the thyristors 8, the potential of the cathode thyristors 8 remains positive relative to their anode potential. Thus, the thyristor 8 conducting by then is completely extinguished.
    权利要求:
    Claims (3)
    [1]
    1. German patent 944619, cell 21a 12/02, 1965.
    [2]
    2. The patent of Germany No. 1488948, cl. H 02 M 7/12, 1970.
    [3]
    3. Glukh E.M. et al. Protection of semiconductor converters. M., Energie, 1970.
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    同族专利:
    公开号 | 公开日
    IT946332B|1973-05-21|
    FR2121514A1|1972-08-25|
    CH546016A|1974-02-15|
    GB1373417A|1974-11-13|
    SE372673B|1974-12-23|
    JPS4714624A|1972-08-11|
    US3702962A|1972-11-14|
    FR2121514B1|1975-04-18|
    DE2100415B2|1973-03-01|
    DE2100415A1|1972-07-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2158289A|1934-10-22|1939-05-16|Asea Ab|Means for suppressing disturbances in ionic valves by grid control|
    SU139716A1|1958-09-08|1960-11-30|Е.М. Глух|Independent three-phase inverter|
    US3198989A|1961-03-30|1965-08-03|American Mach & Foundry|Electronic switch device with commutating capacitor|
    US3217207A|1961-05-26|1965-11-09|Elox Corp Michigan|Peak drive protective circuit|
    FR1325853A|1962-03-23|1963-05-03|Cem Comp Electro Mec|Improvement in polyphase non-autonomous rectifiers and inverters|
    FR1373115A|1963-08-06|1964-09-25|Ferodo Sa|Polyphase inverter device|
    FR1404651A|1964-05-22|1965-07-02|Alsthom Cgee|Static current converter|
    FR1439783A|1964-07-17|1966-05-20|Elin Union Ag|Current rectifier fitted with means for rapid current interruption in the event of a fault|
    US3449654A|1965-10-11|1969-06-10|Gen Motors Corp|Direct current commutation system for brushless electrical motors|US3867669A|1974-01-11|1975-02-18|Yakov Lvovich Krasik|Power source with a sparkproof output|
    US3931546A|1974-05-28|1976-01-06|C. E. Niehoff & Co.|Over-voltage protection circuit|
    JPS51156435U|1975-06-09|1976-12-13|
    JPS5273161A|1975-12-15|1977-06-18|Naniwa Seitei Kk|Intermediate material for manufacturing nut|
    US4331994A|1979-09-28|1982-05-25|Borg-Warner Corporation|Shootthrough fault protection system for a voltage source transistor inverter|
    US4825029A|1987-06-02|1989-04-25|Wickes Companies, Inc.|Spark erosion system for reducing the height of a honeycomb seal|
    US4853046A|1987-09-04|1989-08-01|Surface Combustion, Inc.|Ion carburizing|
    US5127967A|1987-09-04|1992-07-07|Surface Combustion, Inc.|Ion carburizing|
    US5241152A|1990-03-23|1993-08-31|Anderson Glen L|Circuit for detecting and diverting an electrical arc in a glow discharge apparatus|
    DE19843245A1|1997-09-16|1999-08-12|Siemens Ag|Arrangement for obtaining auxiliary energy for a trigger system and use thereof|
    SE510482C2|1997-10-10|1999-05-25|Asea Brown Boveri|Device for voltage setting of a self-commutatedinverter|
    US6442051B1|2000-10-31|2002-08-27|General Electric Company|Full thyristor bridge circuit with free wheeling diode for de-excitation control and stability sensing|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19712100415|DE2100415C3|1971-01-07|Overcurrent protection device for quickly switching off a DC generating system|
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