MICROWAVE HEATING DEVICE Russian patent published in 1997 - IPC

FIELD: microwave devices. SUBSTANCE: device has alternating power supply 1, switch 2, transformer 4 which has primary winding 3, additional winding 5 and secondary winding 7, magnetron 6, capacitor 8, diode 9, N heaters 10 which are located in heating chamber 13, N+1 switches 11, timer 12. Second terminal of alternating power supply 1 is connected to second terminal of primary winding of transformer 4; first terminal of alternating power supply 1 is connected to first terminal of switch 2, which second terminal is connected to first terminal of primary winding 3 of transformer 4. Additional winding 5 of transformer 4 by-passes magnetron heating filament; first terminal of secondary winding 7 of transformer 4 is connected through capacitor 8 to anode of diode 9 and cathode of magnetron 6, which power output is connected to heating chamber 13; second terminal of secondary winding of transformer is connected to first terminal of first element in serial circuit of N heating elements 10 and to second terminal of first switch. First terminal of each subsequent N-1 heating elements 10 is connected to second terminal of corresponding switch 11. Second terminal of N-th heating element is connected to common point of circuit and to second terminal of switch number N+1. First terminal of each N+1 switches is connected to corresponding output of timer 12. Third terminals of switches 11 are joined and are connected to cathode of diode 9. EFFECT: increased functional capabilities. 1 dwg