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    • 1. 发明授权
    • Reflow soldering apparatus
    • 回流焊接装置
    • US6423950B2
    • 2002-07-23
    • US73996300
    • 2000-12-20
    • MIYACHI TECHNOS KK
    • MORO KYOJI
    • B23K1/00B23K3/00B23K3/03B23K3/04B23K3/047H05B1/02
    • B23K3/033B23K3/047B23K3/0471B23K3/0478
    • This reflow soldering apparatus comprises a heater tip 10 for soldering sites to be soldered of a workpiece W by reflow method, a power supply unit for supplying an electric power for heat generation or heating to the heater tip, a control unit for providing a control of the supplied current in the power supply unit, and a pressing unit 16 for pressing the heater tip against the sites to be soldered of the workpiece W. An inverter of the power supply unit has four transistor switching elements. By the control unit by way of a driving circuit, the first set of switching elements and are simultaneously switching (ON/OFF) controlled at a predetermined inverter frequency (e.g., 10 kHz) in response to in-phase inverter control signals G1 and G3, whereas the second set of switching elements are simultaneously switching controlled at the inverter frequency in response to in-phase inverter control signals G2 and G4.
    • 这种回流焊接装置包括用于通过回流焊接焊接工件W的位置的加热器末端10,用于向加热器端提供用于发热或加热的电力的电源单元,用于提供对 供电单元中的供电电流以及用于将加热器尖端压靠在待焊接工件W的位置的按压单元16.电源单元的逆变器具有四个晶体管开关元件。 通过驱动电路的控制单元,响应于同相逆变器控制信号G1和G3,第一组开关元件同时开关(ON / OFF)以预定的反相器频率(例如10kHz)控制 而第二组开关元件响应于同相逆变器控制信号G2和G4而以逆变器频率同时开关控制。
    • 4. 发明专利
    • DE69603343T2
    • 1999-12-30
    • DE69603343
    • 1996-11-11
    • MIYACHI TECHNOS KK
    • ISHIKAWA SAKAE
    • B23K11/24B23K11/25G05B13/02
    • To adapt Fuzzy reasoning to a changed of working environment of resistance welding without requiring changing or updating membership functions, assuring optimal control and satisfactory weld quality. In an embodiment, a welding current I and a change of resistance DELTA R across welding electrodes are measured during a welding operation. The number of welding operations N involving the welding electrodes is incremented. After the present welding operation, these values of DELTA R, I and N are offset by adding offsetting values delta DELTA R, delta I and delta N (step 2 &cir& ). Degrees of membership of respective antecedent membership functions are computed for the offset values ( DELTA R+ delta DELTA R), (I+ delta I) and (N+ delta N) (step 3 &cir& ). Degree of membership of conclusion membership function of each control rule is computed from degrees of membership of its antecedent membership functions (step 4 &cir& ). Then degrees of membership of conclusion membership functions U, S and D is composed (step 5 &cir& ). From the composed degree of membership, an operation value i.e., percent change of preselected welding current is computed by the center-of-gravity defuzzification method (step 6 &cir& ). Finally, the preselected value of welding current is corrected by using the percent change (step 7 &cir& ). The corrected preselected welding current is used for the next welding operation.
    • 9. 发明专利
    • DE69504727D1
    • 1998-10-22
    • DE69504727
    • 1995-02-15
    • MIYACHI TECHNOS KK
    • ISHIKAWA SAKAE
    • B23K11/24B23K11/25
    • A method for controlling resistance welding adaptively optimizes a set value of welding current for the next welding operation by inference from monitored signals of the present welding operation. In an embodiment, a welding current I and a change of resistance DELTA R across welding electrodes are measured during a welding operation. The number of welding operations N involving the welding electrodes is incremented. After the present welding operation, these values of DELTA R, I and N are mapped into compatibility degrees of respective antecedent membership functions. Compatibility degree of conclusion membership function of each control rule is computed from its antecedent membership function compatibility degrees. Then compatibility degree of conclusion membership functions U, S and D is composed. From the composed compatibility degree, an operation value i.e., percent change of set welding current is computed by the center of gravity defuzzification method. Finally, using the percent change, the set value of welding current is corrected. The corrected set welding current is used for the next welding operation.