DC Power source

Details DC Power source DC Power source

1982-07-13

1985-02-12

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219110, 21913032, 323300, B23K 1124

Patent

active

044993633

ABSTRACT:
A DC power source apparatus is provided including a current regulator having an electronic contactor, a transformer having a primary winding and a secondary winding. A series circuit of the primary winding and the current regulator is adapted for connection to an AC power source. The AC power source apparatus also includes a rectifier connected to the secondary winding of the transformer, output terminals of the rectifier being adapted to supply DC current to a DC load having an inductance. The AC power source apparatus further includes a simulator connected to detect an AC current flowing through the series circuit for simulating the DC current flowing through the DC load based on the detected AC current and a simulated time constant of the DC load to produce a simulated signal, and a controller connected to receive the simulated signal for comparing the simulated signal with a predetermined current reference to produce a phase control signal based on a comparison result. The current regulator is further connected to receive the phase control signal for controlling the electronic contactor such that the DC current becomes equal to a predetermined value corresponding to the predetermined current reference. A control apparatus for a DC power source apparatus is also provided.

REFERENCES:
patent: 3875367 (1975-04-01), Tanaka
patent: 4076974 (1978-02-01), Gee
patent: 4254466 (1981-03-01), Jurek

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