Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1982-04-08
1984-07-03
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
204194, 363 37, H02M 3315, H02P 1318
Patent
active
044583060
ABSTRACT:
An industrial plating system operative from a relatively high voltage, 60 Hz, three phase a-c source for providing a relatively low voltage pulsed d-c for delivering currents above around 1,000 amperes to plating load and including amplitudes of 3,000 to 5,000 amperes, and including a controlled rectifier operative with the a-c source to provide a rectified d-c output voltage of a preselected high amplitude, an inverter operative with the controlled rectifier and situated at substantially the same physical location for providing a pulsed a-c output of a preselected width and a-c frequency, the a-c frequency being from around 300 Hz to 3000 Hz, a high frequency rectifier operative with the inverter for providing plating loads with a rectified pulsed d-c having d-c amplitude and a preselected pulsed d-c frequency, the pulsed d-c frequency being greater than the preselected a-c frequency, the high frequency rectifier having a high frequency step down power transformer and a pair of high speed diodes operative in plating systems where the pulsed a-c has a peak amplitude of around 150 volts to 550 volts to provide the pulsed d-c with an amplitude of around 2 volts to 50 volts, and an a-c bus having lines of opposite polarity connecting the pulsed a-c to the input of the high frequency rectifier the a-c bus having a gauge permitting the lines of opposite polarity to be twisted together to minimize inductive and resistive effects of the a-c bus.
REFERENCES:
patent: 221170 (1879-11-01), Holmes et al.
patent: 3942090 (1976-03-01), Matthes et al.
patent: 3995174 (1976-11-01), Zrudsky
patent: 4128868 (1978-12-01), Gamble
patent: 4301428 (1981-11-01), Mayer
Amato Carmelo J.
Galloway James H.
Hooker Chemicals & Plastics Corporation
Shoop William M.
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