• 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:
    Method of protecting a thyristor switch element, of a pulse generator supplying a capacitive load, against damage during sparkovers which occur in the load, the method comprising triggering the thyristor or thyristors (T) in the switch element to conduction if a sparkover occurs in the load (CF) during a period of pulse decay. This can be achieved by starting a timer whenever a pulse starts, the timer running for the duration of the pulse, and detecting the slope of the voltage across the load as a function of time and triggering the thyristor to conduction when the slope of the voltage function exceeds a preset value at a time when the timer is running. Alternatively, for use in an energy conserving pulse generator system, where the pulse current consists of half a period with a current running in one direction and half a period with the current running in the opposite direction, the pulse current can be sensed and the thyristor triggered to conduction if a shift of current direction occurs during a period of pulse decay.
    公开号:SU1371492A3
    申请号:SU823440410
    申请日:1982-05-20
    公开日:1988-01-30
    发明作者:Хендриксен Хенрик；Глар Нильсен Торбен；Эббе Таарнинг Клаус
    申请人:Ф.Л.Смидт И Ко. А/С (Фирма)；
    IPC主号:
    专利说明:

    U & o

    CM
    FIG. five
    The invention relates to electrical engineering and can be used in switching power supplies made on thyristors.
    The purpose of the invention} and - increase the reliability of the device for powering the electrostatic dust separator.
    Figures 1 and 2 depict variants of an electrical impurity power supply circuit for an electrostatic dust separator; FIGS. 3 and 4 are timing diagrams explaining the operation of the circuits of FIGS. 1 and 2; FIGS. 3 and 6 are structural diagrams of the thyristor protection unit; Figures 7 and 8 are temporary diagrams of fy, explaining the operation of the diagrams of FIGS. 3 and 6.
    The device shown in Fig. 1 contains an adjustable rectifier 1, the output of which through a choke 2 is connected to a storage capacitor 3 connected to the primary winding of the pulse transformer A through a thyristor switch consisting of the connected anti-thyristor 3 and diode 6 , and choke 7. In addition, the device contains a high-voltage rectifier 8. The output of the rectifier 8 is connected to the electrostatic dust separator 9 and connected to the secondary winding of the pulse transformer 4 through a capacitor 10.
    The device according to FIG. 2 is made similarly to the device of FIG. 1, except that instead of the primary winding of the pulse transformer 4, the choke 11 is connected thereto, connected to the separator 9 via a capacitor 10.
    The difference between the circuits of FIGS. 1 and 2 is that, in the circuit of FIG. 1, the maximum allowable voltage of the thyristor 3 is consistent with the peak voltage of the pulse of the dust separator by selecting the transformation ratio of the pulse transformer 4, in the circuit of figure 2 the maximum voltage on the thyristor 3 is approximately half of the peak pulse voltage of the splitter pulse.
    The diagram in FIG. 3 contains a thyristor driving unit 12, which represents an oboe block for generating and multiplying trigger signals (key 3 may contain several series-connected thyristors), pulse shaper 13, whose input (-oneeline
    triggering pulses 14, and the output is connected to the first input of the block 12 to bring the thyristor to conductivity, the voltage sensor 13 of the separator connected to the input of the block 16 for identification of the probe. The outputs of block 16 are connected to the inputs of time relay 17 and pulse generator 18, the output of which is connected to the second input of block 12. The second input of time relay 17 is connected to the output of the trigger pulse generator 14, and the output is connected to the second input of pulse generator 18.
    The protection assembly shown in FIG. 6 differs from that indicated in that the input of the sample identification block 16 is connected to the output of the current sensor.
    19 is a dust separator and there is no connection between the second input of time relay 17 and the trigger pulse generator 14.
    Devices according to figures 1 and 2 work as follows.
    Capacitor 3 is charged from rectifier 1 via choke 2 to a predetermined voltage. At the time of formation of the pulse, the thyristor 3 is turned on.
    During the first half cycle, the dust separator 9 is charged to the peak voltage by the current flowing through the capacitor 3, the thyristor 3, the choke 7 and the capacitor 10. FIG. 3 shows the shape of the voltage on the dust separator; Fig. 4 shows the forms of the current (flat line) and voltage (dotted line) on the dust separator. During the second half-cycle of pulse formation, the energy stored in the dust separator tank (with the exception of losses) is returned through diode 6 to capacitor 3. At the moment the current of the thyristor 3 passes through zero, the latter is locked and remains in this State before the next triggering pulse.
    In the event of a breakdown in the dust separator 9 during a period of time,
    when the thyristor 3 is not yet fully locked up, it can fail due to the fact that at this time the conductivity of its internal structure is unevenly distributed and the current is concentrated in several zones of conductivity, which are destroyed.
    Protection node according fig.Z works as follows
    313
    The voltage of the dust separator 9 through the voltage sensor 15 enters the sample identification block 16 (which can be made in the form of a differentiating circuit). In the event of a breakdown in the dust separator 9, the output signal of the unit 16 starts the time relay. 17
    If there are signals at both inputs of the imaging unit 18, it generates a triggering pulse to block 12, which generates a pulse, driving the thyristor 5 to conductance at the beginning of the sample, which prevents its damage. The necessity of introducing the pulse generator 18 in the presence of the pulse generator 13 intended for generating trigger signals in the normal mode is connected with the fact that the block 12 of bringing the thyristor to conductivity must be constantly ready for operation
    The security unit according to FIG. 6 contains a current sensor 19, which can be made in the form of saturation droplets, included in the pulse current loop and provided with an auxiliary winding connected to the input of the sample identification block 16.
    During normal operation, the current (figure 4) consists of a negative half-period followed by a positive half-period. If a breakdown occurs when the pulse voltage decreases, then the current of the subsequent half-period changes its direction, as shown in Fig. 7.
    Fig. 8 shows the voltage form on the auxiliary winding of the current sensor 19.
    At the time A, when the voltage on the auxiliary winding exceeds the specified positive level Tp, the identification unit 16 will start the time relay 17, which operates for the rest of the pulse period, so that the presence of a signal at the time relay output 17 indicates
    24
    em about the presence of a positive half cycle current.
    If the breakdown in the dust separator 9, for example, at time B (Fig. 7), causes the voltage of the current sensor 19 to exceed a negative level T (Fig. 8), then the sample identification block 16 generates a signal at the output of the imager 18, which through block 12 unlocks thyristor 5, preventing damage.
    权利要求:
    Claims (3)
    [1]
    1. A device for powering an electrostatic dust separator containing parallel connected DC voltage source and generator
    impulses based on a thyristor, characterized in that, in order to increase reliability, time relays were inserted in it, fixing the thyristor open state, bringing the thyristor to the conductivity and the unit for determining the breakdown in the dust separator, and the output of the block for determining the breakdown in the dust separator is connected to the control input of the time relay, which fixes the open state of the thyristor, the output of which is connected to the input of the thyristor finishing unit, the output of which is connected to the control input of the thyristor.
    [2]
    2. Device POP.1, characterized in that the unit for determining the breakdown in the dust separator is made in the form of a series connected sensor for the dust separator and the identification unit for the sample, the code of which is used as the output of the unit for determining the sample in the dust separator.
    [3]
    3. The device according to claim 1, that is, that the block for determining the sample in the dust separator is made in the form of a series-connected thyristor current sensor and a sample identification unit, the output of which
    used as a block output to detect breakdown in the dust separator.
    ABOUT
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    -60 -80 -100
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    O 0,555.5 mg
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    R
    Fig 7
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    -120 KB
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    类似技术:
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS4831015B1|1969-01-08|1973-09-26|
    SE338099B|1969-02-14|1971-08-30|Asea Ab|
    SU546304A3|1973-10-05|1977-02-05|Сименс Аг |Device for protection of converter valves|
    US4052177A|1975-03-03|1977-10-04|Nea-Lindberg A/S|Electrostatic precipitator arrangements|
    US4282014A|1975-01-31|1981-08-04|Siemens Aktiengesellschaft|Detector for detecting voltage breakdowns on the high-voltage side of an electric precipitator|
    JPS557448B2|1975-10-02|1980-02-26|
    CA1092186A|1977-12-09|1980-12-23|Andrew C. Stevenson|Forced commutation precipitator circuit|
    JPS54159637A|1978-06-06|1979-12-17|Ishikawajima Harima Heavy Ind|High voltage pulse power source with surge voltage absorbor|
    JPS6142512B2|1978-12-22|1986-09-22|Tokyo Shibaura Electric Co|
    JPS61989B2|1979-04-24|1986-01-13|Tokyo Shibaura Electric Co|IN159046B|1982-04-22|1987-03-14|Dresser Uk Ltd|
    GB2149594A|1983-11-09|1985-06-12|Smidth & Co As F L|Fast-acting spark-over detector|
    DE3435055A1|1984-09-25|1986-04-03|Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover|DEVICE FOR PROTECTING AN BLOCKING PROTECTION ELECTRONICS AGAINST OVERVOLTAGE|
    US4680533A|1985-08-01|1987-07-14|General Electric Company|Protection arrangement for switching device of a capacitive load pulser circuit|
    US4680532A|1985-08-01|1987-07-14|General Electric Company|False triggering protection for switching device of a capacitive load pulser circuit|
    DK165105C|1985-08-19|1993-02-22|Smidth & Co As F L|PROCEDURE AND CIRCUIT FOR THE PROTECTION OF THYRISTORS IN AN IMPULSE GENERATOR|
    US4733058A|1986-02-28|1988-03-22|Colt Industries Inc.|Fail transistor detection and display system for electrical discharge machining apparatus|
    US4757422A|1986-09-15|1988-07-12|Voyager Technologies, Inc.|Dynamically balanced ionization blower|
    DE3640092A1|1986-11-24|1988-06-01|Metallgesellschaft Ag|METHOD AND DEVICE FOR ENERGY SUPPLYING AN ELECTRIC SEPARATOR|
    US5300863A|1992-08-14|1994-04-05|Appleton Electric Company|Auxiliary lighting circuit for a gaseous discharge lamp|
    IT1276108B1|1995-11-10|1997-10-24|Enel Spa|ELECTRONIC CIRCUIT TO GENERATE HIGH VOLTAGE ELECTRIC IMPULSES IN A PULSE POWER SUPPLY FOR AN ELECTROSTATIC PRECIPITATOR|
    PL346832A1|1998-09-18|2002-02-25|Fls Miljo As|A method of operating an electrostatic precipitator|
    US8218221B1|2007-08-21|2012-07-10|Kla-Tencor Corporation|Indium rich InGaN LED line monitor|
    EP2397227A1|2010-06-18|2011-12-21|Alstom Technology Ltd|Method to control the line distortion of a system of power supplies of electrostatic precipitators|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB8115606|1981-05-21|
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