专利汇可以提供D. C. power supply for arc welding with SCR controlling three-phase power专利检索,专利查询,专利分析的服务。并且A D.C. arc welding power supply is supplied with three-phase power through a three-phase transformer. The secondaries of the transformer are connected to a three-phase rectifier bridge with an SCR connected in each phase. A timing pulse generator receives phase reference from the secondaries and produces timing pulses at a controlled time in each phase. A firing signal generator responds to such timing pulses by generating firing signals and applying them to the respective gate electrodes of the SCR''s. A torch switch turns the timing pulses off and on to turn the welding arc off and on, even though full voltage is applied to the primaries. The timing circuit preferably comprises a relaxation oscillator circuit. Multiple torches may be supplied with controlled power simultaneously from the same transformer. A hot start circuit provides greater voltage for a predetermined interval at the beginning of a weld. A MIG spot circuit turns the arc off at the end of a predetermined time for spot welding.,下面是D. C. power supply for arc welding with SCR controlling three-phase power专利的具体信息内容。
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