| 摘要 |
PURPOSE:To reduce the sizes and weights of a core of a magnetic path and a winding by separating the production of a magnetic field, its rotation by a conveying path and different frequency different from the modulation wave, thereby relatively reducing the number of turns of the windings. CONSTITUTION:An exciting winding 1 is connected between an intermediate tap of the secondary winding of a single phase transformer 5 connected to a carrier power source 4 and the intermediate point of two sets 6, 7 and 8, 9 of parallel transistors. When the conductions of the transistors 6, 7 and 8, 9 are switched, a carrier of the same phase as that from the transformer 5 is altered in the direction of the current and applied to the winding 1. Voltage dividing resistors 11- 14 are inserted in series with the modulation wave power source 10, the voltages of 12, 13 are applied in parallel with the base circuits of 6, 7 and 8, 9, and amplified. Accordingly, the carrier voltage is amplitude modulated by the modulating frequency. |
