Magnetic amplifier shutdown circuit
US4949235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1989 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Nov 21, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply (100) for producing a regulated output DC voltage from an AC voltage source (12) having at least one phase (14); a fullwave rectifier (16) coupled to the AC voltage source for producing a rectified output voltage potential, the fullwave rectifier having a number of pairs of diodes (D1-D6) equal to a number of phases of the AC voltage source; a number of pairs of magnetic amplifiers S1-S6 equal to a number of phases of the AC voltage source, each magnetic amplifier having a control input for varying an impedance between an input and an output in response to variation of a control signal; a control (36), responsive to the output voltage, for producing the control signal in response to the output voltage to cancel any variation in the output voltage from a regulated voltage; a fault detection circuit, responsive to an electrical load drawing current from the power supply for producing a shutdown signal; and a circuit, coupled to one of the magnetic amplifiers of each of the phases, responsive to the shutdown signal, for conducting current to the AC voltage source in response to the shutdown signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.