Controlled D-C power supply
US4315305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1979 |
| Grant date | Feb 9, 1982 |
| Priority date | — |
| Expiry date | Sep 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/1623
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
By controlling the phase angle at which conduction occurs in the SCR's in an SCR rectifier bridge, a d-c voltage of adjustable magnitude may be produced from a-c line voltage applied to the bridge. The specific angle at which the SCR's are fired into conduction during each half cycle of the a-c line voltage is determined by comparing a ramp-shaped pulse, produced from the line voltage during each half cycle, with an error signal which varies as a function of the difference between the desired d-c magnitude and the actual amplitude of the d-c voltage. The d-c power supply is made immune to line voltage variations by regulating the ramp-shaped pulses so that they always have the same pulse width regardless of line voltage amplitude, thereby facilitating precise control over the d-c magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.