| 摘要 |
PURPOSE:To eliminate mutual interference between a main converter and an auxiliary power source by operating the auxiliary power source which has a self-excited converter of a DC/DC converter type power source in frequency synchronized with the converting frequency of the power source. CONSTITUTION:A main converter 4 of a DC/DC converter type power source is controlled by a control circuit 3 which contains an oscillator 2 by the output of an auxiliary power source 1 having a self-excited converter, thereby producing a DC output. A synchronizing signal circuit 7 is connected to the auxiliary coil of a transformer T of the main converter 4, the power source 1 is controlled by the output of the circuit 7, operated as a self-excited converter at the starting time, and operated in frequency synchronized with the frequency of the main converter 4. Accordingly, the switching noises of the converter 4 and the power source 1 do not produce mutual interference due to beat, thereby stabilizing the controlling operation. |
