Electric heating – Metal heating – For bonding with pressure
Patent
1978-04-27
1980-10-14
Reynolds, B. A.
Electric heating
Metal heating
For bonding with pressure
320 1, B23K 1126
Patent
active
042283400
ABSTRACT:
A welding power supply that includes a combination of series and shunt regulating circuits controlled by a single controller, in the charging circuit for a welding energy storage capacitor.
The series circuit, which includes a series thyristor, regulates the supply of charging energy to the capacitor from a full wave rectified power source. The series circuit also phases forward to replenish charge lost by leakage by controlling the thyristor firing angle as a function of the difference between the capacitor charge and a pre-selected value.
The shunt regulating circuit utilizes a shunt thyristor coupled to the output of the power source to divert energy delivery away from the energy storage capacitor when a preselected charge level on the capacitor is reached. The shunt regulating circuit shorts out the unneeded balance of the charging cycle thereby eliminating capacitor voltage overshoot during the charging process.
REFERENCES:
patent: 3141124 (1964-07-01), Atherton
patent: 3436514 (1969-04-01), Broomhall et al.
patent: 3641306 (1972-02-01), Oakes
patent: 3644699 (1972-02-01), Mescheryak et al.
patent: 3819983 (1974-06-01), Bjork
patent: 3868562 (1975-02-01), Marshall
Reynolds B. A.
Shaw Clifford C.
Unitek Corporation
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