Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Year | Description |
| 1992 | Invention patented by Brian Campbell on November 19th, 1992. Abstract: A DC power supply for producing plasma for a DC arc torch. The DC power supply includes a controlled switch for coupling and decoupling a direct current source from the DC arc torch. The DC power supply also includes an inductance for supplying current to the DC arc torch when the direct current source is decoupled from the DC arc torch. A freewheeling diode is used to provide a current path from the inductance to the DC arc torch. A switch driver drives the coupling and decoupling of the controlled switch at a particular frequency and at a variable duty cycle. A feedback circuit varies a variable duty cycle of the switch driver in response to the amount of current detected flowing to the DC arc torch. |
| Source: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
