Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1987-07-27
1988-09-06
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
21913021, 363 28, 363 79, H02M 7523, H02M 3315
Patent
active
047697547
ABSTRACT:
A pulse arc welding power supply incorporating one or more series resonant converters (SRC) for converting D.C. power to A.C. power which is then rectified to supply welding current. Each series resonant converter includes a series resonant tank circuit consisting of a capacitor, an inductor and the primary winding of a transformer whose secondary winding supplies current to the welding arc. The undesirable secondary output capacitor of the prior art is eliminated, as all the capacitance in the series resonant circuit is located on the primary side of the transformer. Current sensors sense the ringing current in the resonant circuit and also the load current and produce respective feedback signals which are used to control the switching frequency of an SCR bridge in the tank circuit, thereby maintaining the welding current at a desired value. Inner and outer current regulating loops, including a ramp generator, compensate for non-linearity in the continuous conduction mode of the SRC by limiting the switching frequency of the SCRs. a fault-predicting circuit also further limits the switching frequency in the continuous current mode for additional protection.
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Reynolds Jon O.
Risberg Robert L.
Beha Jr. William H.
Miller Electric Mfg. Co.
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