A modular microwave power supply (100, 101, 102, 103, 104, 105, 106, 107, 108, 109), comprising: a plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) and a plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184), wherein each of plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) further comprises: a ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); a resonant capacitor (25, 36, 39, 56, 60, 82, 85, 113) which connects in series with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); and a rectifier diode (26, 37, 40, 57, 61, 83, 86, 114) which, together with the resonant capacitor (25,36,39,56,60,82,85,113), connects in parallel with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); wherein each of the plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) respectively connects with an electrode of one of the plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184), and the other electrodes of the plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184) are all connected in common to a magnetron load (12, 22, 41, 63, 79, 110, 128, 153, 185), the modular microwave power supply (100, 101, 102, 103, 104, 105, 106, 107, 108, 109) being characterized in that a number of the plurality of microwave power supply modules is N, and a number of the plurality of isolating diodes is N, wherein the N is a positive integer equal to or greater than 4. a plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) and a plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184), wherein each of plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) further comprises: a ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); a resonant capacitor (25, 36, 39, 56, 60, 82, 85, 113) which connects in series with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); and a rectifier diode (26, 37, 40, 57, 61, 83, 86, 114) which, together with the resonant capacitor (25,36,39,56,60,82,85,113), connects in parallel with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); a ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); a resonant capacitor (25, 36, 39, 56, 60, 82, 85, 113) which connects in series with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); and a rectifier diode (26, 37, 40, 57, 61, 83, 86, 114) which, together with the resonant capacitor (25,36,39,56,60,82,85,113), connects in parallel with the secondary winding of the ferro-resonant transformer (23, 35, 38, 55, 59, 81, 84, 112); wherein each of the plurality of microwave power supply modules (10, 20, 33, 34, 53, 54, 75, 76, 91, 92, 93, 120, 121, 122, 123, 145, 146, 147, 148, 173, 174, 175, 176, 177, 178) respectively connects with an electrode of one of the plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184), and the other electrodes of the plurality of isolating diodes (58, 62, 77, 78, 97, 98, 99, 124, 125, 126, 127, 149, 150, 151, 152, 179, 180, 181, 182, 183, 184) are all connected in common to a magnetron load (12, 22, 41, 63, 79, 110, 128, 153, 185), the modular microwave power supply (100, 101, 102, 103, 104, 105, 106, 107, 108, 109) being characterized in that a number of the plurality of microwave power supply modules is N, and a number of the plurality of isolating diodes is N, wherein the N is a positive integer equal to or greater than 4.