Apparatus to sense a silicon controlled rectifier short circuit
US6567253B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2002 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Jan 10, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/1225
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus to sense an SCR short circuit failure and prevent overheating of solid-state power supply equipment, such as a welder, during an occurrence of the short circuit failure is provided. The apparatus includes a detector circuit capable of sensing a short circuit of an SCR in the power supply equipment. The detector circuit senses each voltage of a poly-phase input and generates a fault signal upon substantially simultaneous detection of a zero-cross voltage condition for each phase of the poly-phase input. A control circuit is configured to receive the fault signal of the detector circuit and generate an output to prevent fault current flow through to power supply equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.