Electric supply circuits for a microwave oven
US4011427A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Feb 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2206/043
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric supply circuit for a microwave oven provided with a magnetron tube in which an anode circuit is supplied with high tension, the circuit comprising a mains supply, a leak field transformer having a primary winding and a secondary winding, the secondary winding supplying the anode circuit, two parallel branches connecting the primary winding of the transformer to the mains supply, a first one of the two branches including a switch and a protective resistor serially connected, a second one of the two branches including a relay contact, and a relay coil being connected in series to the protective resistor and forming an additional branch which is connected in parallel to the primary winding of the transformer, the relay coil controlling the relay contact, the first one of the branches being closed upon actuation of the switch supplying the relay coil and the primary winding via the protective resistor, the second one of the branches being closed upon exitation of the relay coil to close the relay contact.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.