• 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:
    The invention relates to welding, in particular to the design of power sources for resistance welding. The purpose of the invention is to increase the reliability of work. During the welding process, the input saturation of the welding transformer core (CCT) is monitored. For this purpose, a measuring winding consisting of two equal parts is installed on the SST core and a voltage of increased frequency is applied to it, which is modulated in amplitude by the measured voltage. The signal for blocking thyristor control is generated by comparing the measured and reference voltages. When the welding pulse ends, the polarity of the welding current changes. Then, welding occurs until the saturation threshold for the CCT is reached again. Monitoring the saturation of the CST makes it possible to optimally use a welding transformer. 2 hp f-ly, 2 ill.
    公开号:SU1530086A3
    申请号:SU853993805
    申请日:1985-12-13
    公开日:1989-12-15
    发明作者:Тенглер Германн；Меттлер Пауль
    申请人:Эльпатроник А.Г. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to welding, in particular to the design of power sources for resistance welding.
    The aim of the invention is to increase the reliability of operation.
    Figure 1 presents the scheme of the welding unit with a frequency converter for the implementation of the proposed method; figure 2 - the magnetic system of the welding transformer.
    On the secondary side of the zigzag-powered three-phase mains transformer T1 (FIG. 1), the primary winding of the welding transformer T2 and three pairs of thyristors V3 - V8 are connected, anti-parallel. The primary winding of the welding transformer T2 is supplied by positive or negative current pulses, the amplitude of which, as well as their passage in time, is controlled by the digital control unit 9.- During the operation of the welding unit, control unit 9 receives information from the saturation control unit 10. The magnetic system of the welding transformer T2 (FIG. 2) is a three-core core, on a central 9d
     CM
    whose rod has the primary W1 and secondary W2 windings. The measuring winding W consists of two parts, connected in series and located on the frames on either side of the central rod. The signal from the measuring winding enters the saturation control unit 10.
    The essence of the method lies in the fact that the welding time is chosen with respect to the direct current both in the same-pulse and in the multi-pulse welding. In the process of welding, the magnetic system of the welding transformer may come to rest, which will lead to the failure of the thyristors. The control of the entrance to the installation is carried out by installing a measuring transformer consisting of two equal parts on a three-core core of a welding transformer and supplying it with a voltage of increased frequency, which is modulated in amplitude by the measured voltage. The closer the core of the welding transformer is to saturation, the lower the inductive resistance of the measuring coil and the amplitude of the voltage removed from the measuring rod. By appropriately selecting the threshold value of the voltage relative to saturation, it is possible to prevent the welding transformer from entering the saturation state. A signal to block control of form-shaped power semiconductor elements; Comparison of measured and reference voltages. After changing the polarity of the pulses supplied to the primary winding of the welding transformer, the magnitude of the reference voltage is increased to eliminate the self-oscillation mode.
    It has been established that the increased frequency voltage supplied to the measuring winding should be chosen in the range of 5-20 kHz.
    Control of the welding unit with frequency converter is proceeding. dit as follows.
    Using welding unit
    establishes on the control panel with coded switches or with the help of a control panel for interactive control of the desired course of the welding process. For this, a number of different control parameters must be
    0
    five
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    five
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    five
    defined or, if firmware control is present, programmed.
    Initially, the initial polarity of the welding current is established (later, the welding current is established by the ignition angle itself). An ignition angle is then preselected for phases A, B and C according to the adjustment of the welding current.
    The length of the welding pulse is not limited to a certain number of periods. The impulse will be such an extension until the core of the transformer reaches saturation. When the welding pulse ends, the polarity of the welding current changes. Then, welding occurs until the saturation threshold value is again reached. In the event that the end of the welding time is reached earlier, the welding ends before the threshold value is reached. Monitoring core penetration allows optimal use of the welding transformer,
    权利要求:
    Claims (3)
    [1]
    Claim 1. Method of controlling a frequency converter welding unit, consisting in monitoring the saturation of a three-core core of a welding transformer with primary and secondary windings on the central core of a three-core core, while the primary winding of a welding transformer is fed through controlled power The semiconductor elements are the positive and negative parts of the sinusoidal current of the mains frequency, which is different from the fact that , set measuring windings connected in series from the central cores of the transformer core and supply them with an increased frequency voltage, modulate the amplitude voltage of the increased frequency with the measured voltage, measure the measured voltage and compare it with the reference voltage at the same time, a signal is formed to block the control of the power semiconductor elements to the saturation of the core of the welding transformer, all welding
    5153
    The time for a specific weldable joint is preselected with respect to the direct current in both single-pulse and multi-pulse welding, and the welding current is created within the previously selected time of the swirl until the threshold value related to saturation is reached.
    6
    [2]
    2. Method POP1, characterized in that the voltage applied to the measuring windings varies with a frequency of 5-20 kHz.
    [3]
    3. Method pop, 1, characterized in that after each achievement of the threshold value measured by the voltage, the reference voltage increases.
    L
    类似技术:
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    同族专利:
    公开号 | 公开日
    GB2168496B|1988-09-01|
    EP0191178A1|1986-08-20|
    CH676442A5|1991-01-31|
    GB2168496A|1986-06-18|
    GR852977B|1986-04-08|
    EP0191178B1|1988-03-02|
    GB8530657D0|1986-01-22|
    AU579056B2|1988-11-10|
    DE3512834C2|1987-10-22|
    FI854938A|1986-06-15|
    US4709132A|1987-11-24|
    JPH036870B2|1991-01-31|
    CA1244095A|1988-11-01|
    JPS61144279A|1986-07-01|
    ES549923A0|1987-05-16|
    FI854938A0|1985-12-13|
    AU5115385A|1986-06-19|
    DE3561695D1|1988-04-07|
    BR8506274A|1986-08-26|
    ES8705275A1|1987-05-16|
    DE3512834A1|1986-06-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2473576A|1945-06-02|1949-06-21|Raytheon Mfg Co|Welding system|
    BE677549A|1966-03-10|
    US3697855A|1970-10-26|1972-10-10|Westinghouse Electric Corp|Hysteresis-loop control for a power transformer|
    US4042872A|1975-12-29|1977-08-16|Mcleod James A|Static converter having partially gapped transformer|
    US4127894A|1977-11-14|1978-11-28|Bell Telephone Laboratories, Incorporated|Converter protection circuit operative to limit and counteract transformer saturation|
    US4282417A|1978-10-30|1981-08-04|Square D Company|Method for controlling magnetizing current in multipulse resistant welding|
    JPS55158884A|1979-05-29|1980-12-10|Toshiba Corp|Resistance welding control device|
    JPS5868486A|1981-10-16|1983-04-23|Dengen Kk|Spot welder|
    US4439822A|1982-03-26|1984-03-27|California Institute Of Technology|Method and apparatus for detecting and preventing impending magnetic saturation in magnetic materials|US5636113A|1995-03-31|1997-06-03|Allen-Bradley Company, Inc.|Saturable reactor|
    DE19621526C1|1996-05-29|1997-08-28|Bosch Gmbh Robert|Welding unit with welding material control|
    AT405624B|1996-09-25|1999-10-25|Stempfer Ferdinand Ing|WELDING DEVICE AND WELDING PROCESS, IN PARTICULAR RESISTANCE WELDING PROCESS|
    CN103731041B|2013-09-11|2016-08-17|上海交通大学|AC/ACvariable-frequency device discontinuous current non-linear compensation method|
    WO2020217109A1|2019-04-22|2020-10-29|Abb Power Grids Switzerland Ag|Traction tranformer with a four-limb core|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH594584A|CH676442A5|1984-12-14|1984-12-14|
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